{{ "language": "Solidity", "sources": { "contracts/pools/weighted/WeightedPool2Tokens.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../../lib/math/FixedPoint.sol\";\nimport \"../../lib/helpers/InputHelpers.sol\";\nimport \"../../lib/helpers/TemporarilyPausable.sol\";\nimport \"../../lib/openzeppelin/ERC20.sol\";\n\nimport \"./WeightedMath.sol\";\nimport \"./WeightedOracleMath.sol\";\nimport \"./WeightedPool2TokensMiscData.sol\";\nimport \"./WeightedPoolUserDataHelpers.sol\";\nimport \"../BalancerPoolToken.sol\";\nimport \"../BasePoolAuthorization.sol\";\nimport \"../oracle/PoolPriceOracle.sol\";\nimport \"../oracle/Buffer.sol\";\n\nimport \"../../vault/interfaces/IMinimalSwapInfoPool.sol\";\nimport \"../IPriceOracle.sol\";\n\ncontract WeightedPool2Tokens is\n IMinimalSwapInfoPool,\n IPriceOracle,\n BasePoolAuthorization,\n BalancerPoolToken,\n TemporarilyPausable,\n PoolPriceOracle,\n WeightedMath,\n WeightedOracleMath\n{\n using FixedPoint for uint256;\n using WeightedPoolUserDataHelpers for bytes;\n using WeightedPool2TokensMiscData for bytes32;\n\n uint256 private constant _MINIMUM_BPT = 1e6;\n\n // 1e18 corresponds to 1.0, or a 100% fee\n uint256 private constant _MIN_SWAP_FEE_PERCENTAGE = 1e12; // 0.0001%\n uint256 private constant _MAX_SWAP_FEE_PERCENTAGE = 1e17; // 10%\n // The swap fee is internally stored using 64 bits, which is enough to represent _MAX_SWAP_FEE_PERCENTAGE.\n\n bytes32 internal _miscData;\n uint256 private _lastInvariant;\n\n IVault private immutable _vault;\n bytes32 private immutable _poolId;\n\n IERC20 internal immutable _token0;\n IERC20 internal immutable _token1;\n\n uint256 private immutable _normalizedWeight0;\n uint256 private immutable _normalizedWeight1;\n\n // The protocol fees will always be charged using the token associated with the max weight in the pool.\n // Since these Pools will register tokens only once, we can assume this index will be constant.\n uint256 private immutable _maxWeightTokenIndex;\n\n // All token balances are normalized to behave as if the token had 18 decimals. We assume a token's decimals will\n // not change throughout its lifetime, and store the corresponding scaling factor for each at construction time.\n // These factors are always greater than or equal to one: tokens with more than 18 decimals are not supported.\n uint256 internal immutable _scalingFactor0;\n uint256 internal immutable _scalingFactor1;\n\n event OracleEnabledChanged(bool enabled);\n event SwapFeePercentageChanged(uint256 swapFeePercentage);\n\n modifier onlyVault(bytes32 poolId) {\n _require(msg.sender == address(getVault()), Errors.CALLER_NOT_VAULT);\n _require(poolId == getPoolId(), Errors.INVALID_POOL_ID);\n _;\n }\n\n struct NewPoolParams {\n IVault vault;\n string name;\n string symbol;\n IERC20 token0;\n IERC20 token1;\n uint256 normalizedWeight0;\n uint256 normalizedWeight1;\n uint256 swapFeePercentage;\n uint256 pauseWindowDuration;\n uint256 bufferPeriodDuration;\n bool oracleEnabled;\n address owner;\n }\n\n constructor(NewPoolParams memory params)\n // Base Pools are expected to be deployed using factories. By using the factory address as the action\n // disambiguator, we make all Pools deployed by the same factory share action identifiers. This allows for\n // simpler management of permissions (such as being able to manage granting the 'set fee percentage' action in\n // any Pool created by the same factory), while still making action identifiers unique among different factories\n // if the selectors match, preventing accidental errors.\n Authentication(bytes32(uint256(msg.sender)))\n BalancerPoolToken(params.name, params.symbol)\n BasePoolAuthorization(params.owner)\n TemporarilyPausable(params.pauseWindowDuration, params.bufferPeriodDuration)\n {\n _setOracleEnabled(params.oracleEnabled);\n _setSwapFeePercentage(params.swapFeePercentage);\n\n bytes32 poolId = params.vault.registerPool(IVault.PoolSpecialization.TWO_TOKEN);\n\n // Pass in zero addresses for Asset Managers\n IERC20[] memory tokens = new IERC20[](2);\n tokens[0] = params.token0;\n tokens[1] = params.token1;\n params.vault.registerTokens(poolId, tokens, new address[](2));\n\n // Set immutable state variables - these cannot be read from during construction\n _vault = params.vault;\n _poolId = poolId;\n\n _token0 = params.token0;\n _token1 = params.token1;\n\n _scalingFactor0 = _computeScalingFactor(params.token0);\n _scalingFactor1 = _computeScalingFactor(params.token1);\n\n // Ensure each normalized weight is above them minimum and find the token index of the maximum weight\n _require(params.normalizedWeight0 >= _MIN_WEIGHT, Errors.MIN_WEIGHT);\n _require(params.normalizedWeight1 >= _MIN_WEIGHT, Errors.MIN_WEIGHT);\n\n // Ensure that the normalized weights sum to ONE\n uint256 normalizedSum = params.normalizedWeight0.add(params.normalizedWeight1);\n _require(normalizedSum == FixedPoint.ONE, Errors.NORMALIZED_WEIGHT_INVARIANT);\n\n _normalizedWeight0 = params.normalizedWeight0;\n _normalizedWeight1 = params.normalizedWeight1;\n _maxWeightTokenIndex = params.normalizedWeight0 >= params.normalizedWeight1 ? 0 : 1;\n }\n\n // Getters / Setters\n\n function getVault() public view returns (IVault) {\n return _vault;\n }\n\n function getPoolId() public view returns (bytes32) {\n return _poolId;\n }\n\n function getMiscData()\n external\n view\n returns (\n int256 logInvariant,\n int256 logTotalSupply,\n uint256 oracleSampleCreationTimestamp,\n uint256 oracleIndex,\n bool oracleEnabled,\n uint256 swapFeePercentage\n )\n {\n bytes32 miscData = _miscData;\n logInvariant = miscData.logInvariant();\n logTotalSupply = miscData.logTotalSupply();\n oracleSampleCreationTimestamp = miscData.oracleSampleCreationTimestamp();\n oracleIndex = miscData.oracleIndex();\n oracleEnabled = miscData.oracleEnabled();\n swapFeePercentage = miscData.swapFeePercentage();\n }\n\n function getSwapFeePercentage() public view returns (uint256) {\n return _miscData.swapFeePercentage();\n }\n\n // Caller must be approved by the Vault's Authorizer\n function setSwapFeePercentage(uint256 swapFeePercentage) external virtual authenticate whenNotPaused {\n _setSwapFeePercentage(swapFeePercentage);\n }\n\n function _setSwapFeePercentage(uint256 swapFeePercentage) private {\n _require(swapFeePercentage >= _MIN_SWAP_FEE_PERCENTAGE, Errors.MIN_SWAP_FEE_PERCENTAGE);\n _require(swapFeePercentage <= _MAX_SWAP_FEE_PERCENTAGE, Errors.MAX_SWAP_FEE_PERCENTAGE);\n\n _miscData = _miscData.setSwapFeePercentage(swapFeePercentage);\n emit SwapFeePercentageChanged(swapFeePercentage);\n }\n\n /**\n * @dev Balancer Governance can always enable the Oracle, even if it was originally not enabled. This allows for\n * Pools that unexpectedly drive much more volume and liquidity than expected to serve as Price Oracles.\n *\n * Note that the Oracle can only be enabled - it can never be disabled.\n */\n function enableOracle() external whenNotPaused authenticate {\n _setOracleEnabled(true);\n\n // Cache log invariant and supply only if the pool was initialized\n if (totalSupply() > 0) {\n _cacheInvariantAndSupply();\n }\n }\n\n function _setOracleEnabled(bool enabled) internal {\n _miscData = _miscData.setOracleEnabled(enabled);\n emit OracleEnabledChanged(enabled);\n }\n\n // Caller must be approved by the Vault's Authorizer\n function setPaused(bool paused) external authenticate {\n _setPaused(paused);\n }\n\n function getNormalizedWeights() external view returns (uint256[] memory) {\n return _normalizedWeights();\n }\n\n function _normalizedWeights() internal view virtual returns (uint256[] memory) {\n uint256[] memory normalizedWeights = new uint256[](2);\n normalizedWeights[0] = _normalizedWeights(true);\n normalizedWeights[1] = _normalizedWeights(false);\n return normalizedWeights;\n }\n\n function _normalizedWeights(bool token0) internal view virtual returns (uint256) {\n return token0 ? _normalizedWeight0 : _normalizedWeight1;\n }\n\n function getLastInvariant() external view returns (uint256) {\n return _lastInvariant;\n }\n\n /**\n * @dev Returns the current value of the invariant.\n */\n function getInvariant() public view returns (uint256) {\n (, uint256[] memory balances, ) = getVault().getPoolTokens(getPoolId());\n\n // Since the Pool hooks always work with upscaled balances, we manually\n // upscale here for consistency\n _upscaleArray(balances);\n\n uint256[] memory normalizedWeights = _normalizedWeights();\n return WeightedMath._calculateInvariant(normalizedWeights, balances);\n }\n\n // Swap Hooks\n\n function onSwap(\n SwapRequest memory request,\n uint256 balanceTokenIn,\n uint256 balanceTokenOut\n ) external virtual override whenNotPaused onlyVault(request.poolId) returns (uint256) {\n bool tokenInIsToken0 = request.tokenIn == _token0;\n\n uint256 scalingFactorTokenIn = _scalingFactor(tokenInIsToken0);\n uint256 scalingFactorTokenOut = _scalingFactor(!tokenInIsToken0);\n\n uint256 normalizedWeightIn = _normalizedWeights(tokenInIsToken0);\n uint256 normalizedWeightOut = _normalizedWeights(!tokenInIsToken0);\n\n // All token amounts are upscaled.\n balanceTokenIn = _upscale(balanceTokenIn, scalingFactorTokenIn);\n balanceTokenOut = _upscale(balanceTokenOut, scalingFactorTokenOut);\n\n // Update price oracle with the pre-swap balances\n _updateOracle(\n request.lastChangeBlock,\n tokenInIsToken0 ? balanceTokenIn : balanceTokenOut,\n tokenInIsToken0 ? balanceTokenOut : balanceTokenIn\n );\n\n if (request.kind == IVault.SwapKind.GIVEN_IN) {\n // Fees are subtracted before scaling, to reduce the complexity of the rounding direction analysis.\n // This is amount - fee amount, so we round up (favoring a higher fee amount).\n uint256 feeAmount = request.amount.mulUp(getSwapFeePercentage());\n request.amount = _upscale(request.amount.sub(feeAmount), scalingFactorTokenIn);\n\n uint256 amountOut = _onSwapGivenIn(\n request,\n balanceTokenIn,\n balanceTokenOut,\n normalizedWeightIn,\n normalizedWeightOut\n );\n\n // amountOut tokens are exiting the Pool, so we round down.\n return _downscaleDown(amountOut, scalingFactorTokenOut);\n } else {\n request.amount = _upscale(request.amount, scalingFactorTokenOut);\n\n uint256 amountIn = _onSwapGivenOut(\n request,\n balanceTokenIn,\n balanceTokenOut,\n normalizedWeightIn,\n normalizedWeightOut\n );\n\n // amountIn tokens are entering the Pool, so we round up.\n amountIn = _downscaleUp(amountIn, scalingFactorTokenIn);\n\n // Fees are added after scaling happens, to reduce the complexity of the rounding direction analysis.\n // This is amount + fee amount, so we round up (favoring a higher fee amount).\n return amountIn.divUp(getSwapFeePercentage().complement());\n }\n }\n\n function _onSwapGivenIn(\n SwapRequest memory swapRequest,\n uint256 currentBalanceTokenIn,\n uint256 currentBalanceTokenOut,\n uint256 normalizedWeightIn,\n uint256 normalizedWeightOut\n ) private pure returns (uint256) {\n // Swaps are disabled while the contract is paused.\n return\n WeightedMath._calcOutGivenIn(\n currentBalanceTokenIn,\n normalizedWeightIn,\n currentBalanceTokenOut,\n normalizedWeightOut,\n swapRequest.amount\n );\n }\n\n function _onSwapGivenOut(\n SwapRequest memory swapRequest,\n uint256 currentBalanceTokenIn,\n uint256 currentBalanceTokenOut,\n uint256 normalizedWeightIn,\n uint256 normalizedWeightOut\n ) private pure returns (uint256) {\n // Swaps are disabled while the contract is paused.\n return\n WeightedMath._calcInGivenOut(\n currentBalanceTokenIn,\n normalizedWeightIn,\n currentBalanceTokenOut,\n normalizedWeightOut,\n swapRequest.amount\n );\n }\n\n // Join Hook\n\n function onJoinPool(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n )\n external\n virtual\n override\n onlyVault(poolId)\n whenNotPaused\n returns (uint256[] memory amountsIn, uint256[] memory dueProtocolFeeAmounts)\n {\n // All joins, including initializations, are disabled while the contract is paused.\n\n uint256 bptAmountOut;\n if (totalSupply() == 0) {\n (bptAmountOut, amountsIn) = _onInitializePool(poolId, sender, recipient, userData);\n\n // On initialization, we lock _MINIMUM_BPT by minting it for the zero address. This BPT acts as a minimum\n // as it will never be burned, which reduces potential issues with rounding, and also prevents the Pool from\n // ever being fully drained.\n _require(bptAmountOut >= _MINIMUM_BPT, Errors.MINIMUM_BPT);\n _mintPoolTokens(address(0), _MINIMUM_BPT);\n _mintPoolTokens(recipient, bptAmountOut - _MINIMUM_BPT);\n\n // amountsIn are amounts entering the Pool, so we round up.\n _downscaleUpArray(amountsIn);\n\n // There are no due protocol fee amounts during initialization\n dueProtocolFeeAmounts = new uint256[](2);\n } else {\n _upscaleArray(balances);\n\n // Update price oracle with the pre-join balances\n _updateOracle(lastChangeBlock, balances[0], balances[1]);\n\n (bptAmountOut, amountsIn, dueProtocolFeeAmounts) = _onJoinPool(\n poolId,\n sender,\n recipient,\n balances,\n lastChangeBlock,\n protocolSwapFeePercentage,\n userData\n );\n\n // Note we no longer use `balances` after calling `_onJoinPool`, which may mutate it.\n\n _mintPoolTokens(recipient, bptAmountOut);\n\n // amountsIn are amounts entering the Pool, so we round up.\n _downscaleUpArray(amountsIn);\n // dueProtocolFeeAmounts are amounts exiting the Pool, so we round down.\n _downscaleDownArray(dueProtocolFeeAmounts);\n }\n\n // Update cached total supply and invariant using the results after the join that will be used for future\n // oracle updates.\n _cacheInvariantAndSupply();\n }\n\n /**\n * @dev Called when the Pool is joined for the first time; that is, when the BPT total supply is zero.\n *\n * Returns the amount of BPT to mint, and the token amounts the Pool will receive in return.\n *\n * Minted BPT will be sent to `recipient`, except for _MINIMUM_BPT, which will be deducted from this amount and sent\n * to the zero address instead. This will cause that BPT to remain forever locked there, preventing total BTP from\n * ever dropping below that value, and ensuring `_onInitializePool` can only be called once in the entire Pool's\n * lifetime.\n *\n * The tokens granted to the Pool will be transferred from `sender`. These amounts are considered upscaled and will\n * be downscaled (rounding up) before being returned to the Vault.\n */\n function _onInitializePool(\n bytes32,\n address,\n address,\n bytes memory userData\n ) private returns (uint256, uint256[] memory) {\n WeightedPool.JoinKind kind = userData.joinKind();\n _require(kind == WeightedPool.JoinKind.INIT, Errors.UNINITIALIZED);\n\n uint256[] memory amountsIn = userData.initialAmountsIn();\n InputHelpers.ensureInputLengthMatch(amountsIn.length, 2);\n _upscaleArray(amountsIn);\n\n uint256[] memory normalizedWeights = _normalizedWeights();\n\n uint256 invariantAfterJoin = WeightedMath._calculateInvariant(normalizedWeights, amountsIn);\n\n // Set the initial BPT to the value of the invariant times the number of tokens. This makes BPT supply more\n // consistent in Pools with similar compositions but different number of tokens.\n uint256 bptAmountOut = Math.mul(invariantAfterJoin, 2);\n\n _lastInvariant = invariantAfterJoin;\n\n return (bptAmountOut, amountsIn);\n }\n\n /**\n * @dev Called whenever the Pool is joined after the first initialization join (see `_onInitializePool`).\n *\n * Returns the amount of BPT to mint, the token amounts that the Pool will receive in return, and the number of\n * tokens to pay in protocol swap fees.\n *\n * Implementations of this function might choose to mutate the `balances` array to save gas (e.g. when\n * performing intermediate calculations, such as subtraction of due protocol fees). This can be done safely.\n *\n * Minted BPT will be sent to `recipient`.\n *\n * The tokens granted to the Pool will be transferred from `sender`. These amounts are considered upscaled and will\n * be downscaled (rounding up) before being returned to the Vault.\n *\n * Due protocol swap fees will be taken from the Pool's balance in the Vault (see `IBasePool.onJoinPool`). These\n * amounts are considered upscaled and will be downscaled (rounding down) before being returned to the Vault.\n */\n function _onJoinPool(\n bytes32,\n address,\n address,\n uint256[] memory balances,\n uint256,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n )\n private\n returns (\n uint256,\n uint256[] memory,\n uint256[] memory\n )\n {\n uint256[] memory normalizedWeights = _normalizedWeights();\n\n // Due protocol swap fee amounts are computed by measuring the growth of the invariant between the previous join\n // or exit event and now - the invariant's growth is due exclusively to swap fees. This avoids spending gas\n // computing them on each individual swap\n uint256 invariantBeforeJoin = WeightedMath._calculateInvariant(normalizedWeights, balances);\n\n uint256[] memory dueProtocolFeeAmounts = _getDueProtocolFeeAmounts(\n balances,\n normalizedWeights,\n _lastInvariant,\n invariantBeforeJoin,\n protocolSwapFeePercentage\n );\n\n // Update current balances by subtracting the protocol fee amounts\n _mutateAmounts(balances, dueProtocolFeeAmounts, FixedPoint.sub);\n (uint256 bptAmountOut, uint256[] memory amountsIn) = _doJoin(balances, normalizedWeights, userData);\n\n // Update the invariant with the balances the Pool will have after the join, in order to compute the\n // protocol swap fee amounts due in future joins and exits.\n _mutateAmounts(balances, amountsIn, FixedPoint.add);\n _lastInvariant = WeightedMath._calculateInvariant(normalizedWeights, balances);\n\n return (bptAmountOut, amountsIn, dueProtocolFeeAmounts);\n }\n\n function _doJoin(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n bytes memory userData\n ) private view returns (uint256, uint256[] memory) {\n WeightedPool.JoinKind kind = userData.joinKind();\n\n if (kind == WeightedPool.JoinKind.EXACT_TOKENS_IN_FOR_BPT_OUT) {\n return _joinExactTokensInForBPTOut(balances, normalizedWeights, userData);\n } else if (kind == WeightedPool.JoinKind.TOKEN_IN_FOR_EXACT_BPT_OUT) {\n return _joinTokenInForExactBPTOut(balances, normalizedWeights, userData);\n } else {\n _revert(Errors.UNHANDLED_JOIN_KIND);\n }\n }\n\n function _joinExactTokensInForBPTOut(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n bytes memory userData\n ) private view returns (uint256, uint256[] memory) {\n (uint256[] memory amountsIn, uint256 minBPTAmountOut) = userData.exactTokensInForBptOut();\n InputHelpers.ensureInputLengthMatch(amountsIn.length, 2);\n\n _upscaleArray(amountsIn);\n\n uint256 bptAmountOut = WeightedMath._calcBptOutGivenExactTokensIn(\n balances,\n normalizedWeights,\n amountsIn,\n totalSupply(),\n getSwapFeePercentage()\n );\n\n _require(bptAmountOut >= minBPTAmountOut, Errors.BPT_OUT_MIN_AMOUNT);\n\n return (bptAmountOut, amountsIn);\n }\n\n function _joinTokenInForExactBPTOut(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n bytes memory userData\n ) private view returns (uint256, uint256[] memory) {\n (uint256 bptAmountOut, uint256 tokenIndex) = userData.tokenInForExactBptOut();\n // Note that there is no maximum amountIn parameter: this is handled by `IVault.joinPool`.\n\n _require(tokenIndex < 2, Errors.OUT_OF_BOUNDS);\n\n uint256[] memory amountsIn = new uint256[](2);\n amountsIn[tokenIndex] = WeightedMath._calcTokenInGivenExactBptOut(\n balances[tokenIndex],\n normalizedWeights[tokenIndex],\n bptAmountOut,\n totalSupply(),\n getSwapFeePercentage()\n );\n\n return (bptAmountOut, amountsIn);\n }\n\n // Exit Hook\n\n function onExitPool(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n ) external virtual override onlyVault(poolId) returns (uint256[] memory, uint256[] memory) {\n _upscaleArray(balances);\n\n (uint256 bptAmountIn, uint256[] memory amountsOut, uint256[] memory dueProtocolFeeAmounts) = _onExitPool(\n poolId,\n sender,\n recipient,\n balances,\n lastChangeBlock,\n protocolSwapFeePercentage,\n userData\n );\n\n // Note we no longer use `balances` after calling `_onExitPool`, which may mutate it.\n\n _burnPoolTokens(sender, bptAmountIn);\n\n // Both amountsOut and dueProtocolFeeAmounts are amounts exiting the Pool, so we round down.\n _downscaleDownArray(amountsOut);\n _downscaleDownArray(dueProtocolFeeAmounts);\n\n // Update cached total supply and invariant using the results after the exit that will be used for future\n // oracle updates, only if the pool was not paused (to minimize code paths taken while paused).\n if (_isNotPaused()) {\n _cacheInvariantAndSupply();\n }\n\n return (amountsOut, dueProtocolFeeAmounts);\n }\n\n /**\n * @dev Called whenever the Pool is exited.\n *\n * Returns the amount of BPT to burn, the token amounts for each Pool token that the Pool will grant in return, and\n * the number of tokens to pay in protocol swap fees.\n *\n * Implementations of this function might choose to mutate the `balances` array to save gas (e.g. when\n * performing intermediate calculations, such as subtraction of due protocol fees). This can be done safely.\n *\n * BPT will be burnt from `sender`.\n *\n * The Pool will grant tokens to `recipient`. These amounts are considered upscaled and will be downscaled\n * (rounding down) before being returned to the Vault.\n *\n * Due protocol swap fees will be taken from the Pool's balance in the Vault (see `IBasePool.onExitPool`). These\n * amounts are considered upscaled and will be downscaled (rounding down) before being returned to the Vault.\n */\n function _onExitPool(\n bytes32,\n address,\n address,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n )\n private\n returns (\n uint256 bptAmountIn,\n uint256[] memory amountsOut,\n uint256[] memory dueProtocolFeeAmounts\n )\n {\n // Exits are not completely disabled while the contract is paused: proportional exits (exact BPT in for tokens\n // out) remain functional.\n\n uint256[] memory normalizedWeights = _normalizedWeights();\n\n if (_isNotPaused()) {\n // Update price oracle with the pre-exit balances\n _updateOracle(lastChangeBlock, balances[0], balances[1]);\n\n // Due protocol swap fee amounts are computed by measuring the growth of the invariant between the previous\n // join or exit event and now - the invariant's growth is due exclusively to swap fees. This avoids\n // spending gas calculating the fees on each individual swap.\n uint256 invariantBeforeExit = WeightedMath._calculateInvariant(normalizedWeights, balances);\n dueProtocolFeeAmounts = _getDueProtocolFeeAmounts(\n balances,\n normalizedWeights,\n _lastInvariant,\n invariantBeforeExit,\n protocolSwapFeePercentage\n );\n\n // Update current balances by subtracting the protocol fee amounts\n _mutateAmounts(balances, dueProtocolFeeAmounts, FixedPoint.sub);\n } else {\n // If the contract is paused, swap protocol fee amounts are not charged and the oracle is not updated\n // to avoid extra calculations and reduce the potential for errors.\n dueProtocolFeeAmounts = new uint256[](2);\n }\n\n (bptAmountIn, amountsOut) = _doExit(balances, normalizedWeights, userData);\n\n // Update the invariant with the balances the Pool will have after the exit, in order to compute the\n // protocol swap fees due in future joins and exits.\n _mutateAmounts(balances, amountsOut, FixedPoint.sub);\n _lastInvariant = WeightedMath._calculateInvariant(normalizedWeights, balances);\n\n return (bptAmountIn, amountsOut, dueProtocolFeeAmounts);\n }\n\n function _doExit(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n bytes memory userData\n ) private view returns (uint256, uint256[] memory) {\n WeightedPool.ExitKind kind = userData.exitKind();\n\n if (kind == WeightedPool.ExitKind.EXACT_BPT_IN_FOR_ONE_TOKEN_OUT) {\n return _exitExactBPTInForTokenOut(balances, normalizedWeights, userData);\n } else if (kind == WeightedPool.ExitKind.EXACT_BPT_IN_FOR_TOKENS_OUT) {\n return _exitExactBPTInForTokensOut(balances, userData);\n } else {\n // ExitKind.BPT_IN_FOR_EXACT_TOKENS_OUT\n return _exitBPTInForExactTokensOut(balances, normalizedWeights, userData);\n }\n }\n\n function _exitExactBPTInForTokenOut(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n bytes memory userData\n ) private view whenNotPaused returns (uint256, uint256[] memory) {\n // This exit function is disabled if the contract is paused.\n\n (uint256 bptAmountIn, uint256 tokenIndex) = userData.exactBptInForTokenOut();\n // Note that there is no minimum amountOut parameter: this is handled by `IVault.exitPool`.\n\n _require(tokenIndex < 2, Errors.OUT_OF_BOUNDS);\n\n // We exit in a single token, so we initialize amountsOut with zeros\n uint256[] memory amountsOut = new uint256[](2);\n\n // And then assign the result to the selected token\n amountsOut[tokenIndex] = WeightedMath._calcTokenOutGivenExactBptIn(\n balances[tokenIndex],\n normalizedWeights[tokenIndex],\n bptAmountIn,\n totalSupply(),\n getSwapFeePercentage()\n );\n\n return (bptAmountIn, amountsOut);\n }\n\n function _exitExactBPTInForTokensOut(uint256[] memory balances, bytes memory userData)\n private\n view\n returns (uint256, uint256[] memory)\n {\n // This exit function is the only one that is not disabled if the contract is paused: it remains unrestricted\n // in an attempt to provide users with a mechanism to retrieve their tokens in case of an emergency.\n // This particular exit function is the only one that remains available because it is the simplest one, and\n // therefore the one with the lowest likelihood of errors.\n\n uint256 bptAmountIn = userData.exactBptInForTokensOut();\n // Note that there is no minimum amountOut parameter: this is handled by `IVault.exitPool`.\n\n uint256[] memory amountsOut = WeightedMath._calcTokensOutGivenExactBptIn(balances, bptAmountIn, totalSupply());\n return (bptAmountIn, amountsOut);\n }\n\n function _exitBPTInForExactTokensOut(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n bytes memory userData\n ) private view whenNotPaused returns (uint256, uint256[] memory) {\n // This exit function is disabled if the contract is paused.\n\n (uint256[] memory amountsOut, uint256 maxBPTAmountIn) = userData.bptInForExactTokensOut();\n InputHelpers.ensureInputLengthMatch(amountsOut.length, 2);\n _upscaleArray(amountsOut);\n\n uint256 bptAmountIn = WeightedMath._calcBptInGivenExactTokensOut(\n balances,\n normalizedWeights,\n amountsOut,\n totalSupply(),\n getSwapFeePercentage()\n );\n _require(bptAmountIn <= maxBPTAmountIn, Errors.BPT_IN_MAX_AMOUNT);\n\n return (bptAmountIn, amountsOut);\n }\n\n // Oracle functions\n\n function getLargestSafeQueryWindow() external pure override returns (uint256) {\n return 34 hours;\n }\n\n function getLatest(Variable variable) external view override returns (uint256) {\n int256 instantValue = _getInstantValue(variable, _miscData.oracleIndex());\n return _fromLowResLog(instantValue);\n }\n\n function getTimeWeightedAverage(OracleAverageQuery[] memory queries)\n external\n view\n override\n returns (uint256[] memory results)\n {\n results = new uint256[](queries.length);\n\n uint256 oracleIndex = _miscData.oracleIndex();\n\n OracleAverageQuery memory query;\n for (uint256 i = 0; i < queries.length; ++i) {\n query = queries[i];\n _require(query.secs != 0, Errors.ORACLE_BAD_SECS);\n\n int256 beginAccumulator = _getPastAccumulator(query.variable, oracleIndex, query.ago + query.secs);\n int256 endAccumulator = _getPastAccumulator(query.variable, oracleIndex, query.ago);\n results[i] = _fromLowResLog((endAccumulator - beginAccumulator) / int256(query.secs));\n }\n }\n\n function getPastAccumulators(OracleAccumulatorQuery[] memory queries)\n external\n view\n override\n returns (int256[] memory results)\n {\n results = new int256[](queries.length);\n\n uint256 oracleIndex = _miscData.oracleIndex();\n\n OracleAccumulatorQuery memory query;\n for (uint256 i = 0; i < queries.length; ++i) {\n query = queries[i];\n results[i] = _getPastAccumulator(query.variable, oracleIndex, query.ago);\n }\n }\n\n /**\n * @dev Updates the Price Oracle based on the Pool's current state (balances, BPT supply and invariant). Must be\n * called on *all* state-changing functions with the balances *before* the state change happens, and with\n * `lastChangeBlock` as the number of the block in which any of the balances last changed.\n */\n function _updateOracle(\n uint256 lastChangeBlock,\n uint256 balanceToken0,\n uint256 balanceToken1\n ) internal {\n bytes32 miscData = _miscData;\n if (miscData.oracleEnabled() && block.number > lastChangeBlock) {\n int256 logSpotPrice = WeightedOracleMath._calcLogSpotPrice(\n _normalizedWeight0,\n balanceToken0,\n _normalizedWeight1,\n balanceToken1\n );\n\n int256 logBPTPrice = WeightedOracleMath._calcLogBPTPrice(\n _normalizedWeight0,\n balanceToken0,\n miscData.logTotalSupply()\n );\n\n uint256 oracleCurrentIndex = miscData.oracleIndex();\n uint256 oracleCurrentSampleInitialTimestamp = miscData.oracleSampleCreationTimestamp();\n uint256 oracleUpdatedIndex = _processPriceData(\n oracleCurrentSampleInitialTimestamp,\n oracleCurrentIndex,\n logSpotPrice,\n logBPTPrice,\n miscData.logInvariant()\n );\n\n if (oracleCurrentIndex != oracleUpdatedIndex) {\n // solhint-disable not-rely-on-time\n miscData = miscData.setOracleIndex(oracleUpdatedIndex);\n miscData = miscData.setOracleSampleCreationTimestamp(block.timestamp);\n _miscData = miscData;\n }\n }\n }\n\n /**\n * @dev Stores the logarithm of the invariant and BPT total supply, to be later used in each oracle update. Because\n * it is stored in miscData, which is read in all operations (including swaps), this saves gas by not requiring to\n * compute or read these values when updating the oracle.\n *\n * This function must be called by all actions that update the invariant and BPT supply (joins and exits). Swaps\n * also alter the invariant due to collected swap fees, but this growth is considered negligible and not accounted\n * for.\n */\n function _cacheInvariantAndSupply() internal {\n bytes32 miscData = _miscData;\n if (miscData.oracleEnabled()) {\n miscData = miscData.setLogInvariant(WeightedOracleMath._toLowResLog(_lastInvariant));\n miscData = miscData.setLogTotalSupply(WeightedOracleMath._toLowResLog(totalSupply()));\n _miscData = miscData;\n }\n }\n\n // Query functions\n\n /**\n * @dev Returns the amount of BPT that would be granted to `recipient` if the `onJoinPool` hook were called by the\n * Vault with the same arguments, along with the number of tokens `sender` would have to supply.\n *\n * This function is not meant to be called directly, but rather from a helper contract that fetches current Vault\n * data, such as the protocol swap fee percentage and Pool balances.\n *\n * Like `IVault.queryBatchSwap`, this function is not view due to internal implementation details: the caller must\n * explicitly use eth_call instead of eth_sendTransaction.\n */\n function queryJoin(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n ) external returns (uint256 bptOut, uint256[] memory amountsIn) {\n InputHelpers.ensureInputLengthMatch(balances.length, 2);\n\n _queryAction(\n poolId,\n sender,\n recipient,\n balances,\n lastChangeBlock,\n protocolSwapFeePercentage,\n userData,\n _onJoinPool,\n _downscaleUpArray\n );\n\n // The `return` opcode is executed directly inside `_queryAction`, so execution never reaches this statement,\n // and we don't need to return anything here - it just silences compiler warnings.\n return (bptOut, amountsIn);\n }\n\n /**\n * @dev Returns the amount of BPT that would be burned from `sender` if the `onExitPool` hook were called by the\n * Vault with the same arguments, along with the number of tokens `recipient` would receive.\n *\n * This function is not meant to be called directly, but rather from a helper contract that fetches current Vault\n * data, such as the protocol swap fee percentage and Pool balances.\n *\n * Like `IVault.queryBatchSwap`, this function is not view due to internal implementation details: the caller must\n * explicitly use eth_call instead of eth_sendTransaction.\n */\n function queryExit(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n ) external returns (uint256 bptIn, uint256[] memory amountsOut) {\n InputHelpers.ensureInputLengthMatch(balances.length, 2);\n\n _queryAction(\n poolId,\n sender,\n recipient,\n balances,\n lastChangeBlock,\n protocolSwapFeePercentage,\n userData,\n _onExitPool,\n _downscaleDownArray\n );\n\n // The `return` opcode is executed directly inside `_queryAction`, so execution never reaches this statement,\n // and we don't need to return anything here - it just silences compiler warnings.\n return (bptIn, amountsOut);\n }\n\n // Helpers\n\n function _getDueProtocolFeeAmounts(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n uint256 previousInvariant,\n uint256 currentInvariant,\n uint256 protocolSwapFeePercentage\n ) private view returns (uint256[] memory) {\n // Initialize with zeros\n uint256[] memory dueProtocolFeeAmounts = new uint256[](2);\n\n // Early return if the protocol swap fee percentage is zero, saving gas.\n if (protocolSwapFeePercentage == 0) {\n return dueProtocolFeeAmounts;\n }\n\n // The protocol swap fees are always paid using the token with the largest weight in the Pool. As this is the\n // token that is expected to have the largest balance, using it to pay fees should not unbalance the Pool.\n dueProtocolFeeAmounts[_maxWeightTokenIndex] = WeightedMath._calcDueTokenProtocolSwapFeeAmount(\n balances[_maxWeightTokenIndex],\n normalizedWeights[_maxWeightTokenIndex],\n previousInvariant,\n currentInvariant,\n protocolSwapFeePercentage\n );\n\n return dueProtocolFeeAmounts;\n }\n\n /**\n * @dev Mutates `amounts` by applying `mutation` with each entry in `arguments`.\n *\n * Equivalent to `amounts = amounts.map(mutation)`.\n */\n function _mutateAmounts(\n uint256[] memory toMutate,\n uint256[] memory arguments,\n function(uint256, uint256) pure returns (uint256) mutation\n ) private pure {\n toMutate[0] = mutation(toMutate[0], arguments[0]);\n toMutate[1] = mutation(toMutate[1], arguments[1]);\n }\n\n /**\n * @dev This function returns the appreciation of one BPT relative to the\n * underlying tokens. This starts at 1 when the pool is created and grows over time\n */\n function getRate() public view returns (uint256) {\n // The initial BPT supply is equal to the invariant times the number of tokens.\n return Math.mul(getInvariant(), 2).divDown(totalSupply());\n }\n\n // Scaling\n\n /**\n * @dev Returns a scaling factor that, when multiplied to a token amount for `token`, normalizes its balance as if\n * it had 18 decimals.\n */\n function _computeScalingFactor(IERC20 token) private view returns (uint256) {\n // Tokens that don't implement the `decimals` method are not supported.\n uint256 tokenDecimals = ERC20(address(token)).decimals();\n\n // Tokens with more than 18 decimals are not supported.\n uint256 decimalsDifference = Math.sub(18, tokenDecimals);\n return 10**decimalsDifference;\n }\n\n /**\n * @dev Returns the scaling factor for one of the Pool's tokens. Reverts if `token` is not a token registered by the\n * Pool.\n */\n function _scalingFactor(bool token0) internal view returns (uint256) {\n return token0 ? _scalingFactor0 : _scalingFactor1;\n }\n\n /**\n * @dev Applies `scalingFactor` to `amount`, resulting in a larger or equal value depending on whether it needed\n * scaling or not.\n */\n function _upscale(uint256 amount, uint256 scalingFactor) internal pure returns (uint256) {\n return Math.mul(amount, scalingFactor);\n }\n\n /**\n * @dev Same as `_upscale`, but for an entire array (of two elements). This function does not return anything, but\n * instead *mutates* the `amounts` array.\n */\n function _upscaleArray(uint256[] memory amounts) internal view {\n amounts[0] = Math.mul(amounts[0], _scalingFactor(true));\n amounts[1] = Math.mul(amounts[1], _scalingFactor(false));\n }\n\n /**\n * @dev Reverses the `scalingFactor` applied to `amount`, resulting in a smaller or equal value depending on\n * whether it needed scaling or not. The result is rounded down.\n */\n function _downscaleDown(uint256 amount, uint256 scalingFactor) internal pure returns (uint256) {\n return Math.divDown(amount, scalingFactor);\n }\n\n /**\n * @dev Same as `_downscaleDown`, but for an entire array (of two elements). This function does not return anything,\n * but instead *mutates* the `amounts` array.\n */\n function _downscaleDownArray(uint256[] memory amounts) internal view {\n amounts[0] = Math.divDown(amounts[0], _scalingFactor(true));\n amounts[1] = Math.divDown(amounts[1], _scalingFactor(false));\n }\n\n /**\n * @dev Reverses the `scalingFactor` applied to `amount`, resulting in a smaller or equal value depending on\n * whether it needed scaling or not. The result is rounded up.\n */\n function _downscaleUp(uint256 amount, uint256 scalingFactor) internal pure returns (uint256) {\n return Math.divUp(amount, scalingFactor);\n }\n\n /**\n * @dev Same as `_downscaleUp`, but for an entire array (of two elements). This function does not return anything,\n * but instead *mutates* the `amounts` array.\n */\n function _downscaleUpArray(uint256[] memory amounts) internal view {\n amounts[0] = Math.divUp(amounts[0], _scalingFactor(true));\n amounts[1] = Math.divUp(amounts[1], _scalingFactor(false));\n }\n\n function _getAuthorizer() internal view override returns (IAuthorizer) {\n // Access control management is delegated to the Vault's Authorizer. This lets Balancer Governance manage which\n // accounts can call permissioned functions: for example, to perform emergency pauses.\n // If the owner is delegated, then *all* permissioned functions, including `setSwapFeePercentage`, will be under\n // Governance control.\n return getVault().getAuthorizer();\n }\n\n function _queryAction(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData,\n function(bytes32, address, address, uint256[] memory, uint256, uint256, bytes memory)\n internal\n returns (uint256, uint256[] memory, uint256[] memory) _action,\n function(uint256[] memory) internal view _downscaleArray\n ) private {\n // This uses the same technique used by the Vault in queryBatchSwap. Refer to that function for a detailed\n // explanation.\n\n if (msg.sender != address(this)) {\n // We perform an external call to ourselves, forwarding the same calldata. In this call, the else clause of\n // the preceding if statement will be executed instead.\n\n // solhint-disable-next-line avoid-low-level-calls\n (bool success, ) = address(this).call(msg.data);\n\n // solhint-disable-next-line no-inline-assembly\n assembly {\n // This call should always revert to decode the bpt and token amounts from the revert reason\n switch success\n case 0 {\n // Note we are manually writing the memory slot 0. We can safely overwrite whatever is\n // stored there as we take full control of the execution and then immediately return.\n\n // We copy the first 4 bytes to check if it matches with the expected signature, otherwise\n // there was another revert reason and we should forward it.\n returndatacopy(0, 0, 0x04)\n let error := and(mload(0), 0xffffffff00000000000000000000000000000000000000000000000000000000)\n\n // If the first 4 bytes don't match with the expected signature, we forward the revert reason.\n if eq(eq(error, 0x43adbafb00000000000000000000000000000000000000000000000000000000), 0) {\n returndatacopy(0, 0, returndatasize())\n revert(0, returndatasize())\n }\n\n // The returndata contains the signature, followed by the raw memory representation of the\n // `bptAmount` and `tokenAmounts` (array: length + data). We need to return an ABI-encoded\n // representation of these.\n // An ABI-encoded response will include one additional field to indicate the starting offset of\n // the `tokenAmounts` array. The `bptAmount` will be laid out in the first word of the\n // returndata.\n //\n // In returndata:\n // [ signature ][ bptAmount ][ tokenAmounts length ][ tokenAmounts values ]\n // [ 4 bytes ][ 32 bytes ][ 32 bytes ][ (32 * length) bytes ]\n //\n // We now need to return (ABI-encoded values):\n // [ bptAmount ][ tokeAmounts offset ][ tokenAmounts length ][ tokenAmounts values ]\n // [ 32 bytes ][ 32 bytes ][ 32 bytes ][ (32 * length) bytes ]\n\n // We copy 32 bytes for the `bptAmount` from returndata into memory.\n // Note that we skip the first 4 bytes for the error signature\n returndatacopy(0, 0x04, 32)\n\n // The offsets are 32-bytes long, so the array of `tokenAmounts` will start after\n // the initial 64 bytes.\n mstore(0x20, 64)\n\n // We now copy the raw memory array for the `tokenAmounts` from returndata into memory.\n // Since bpt amount and offset take up 64 bytes, we start copying at address 0x40. We also\n // skip the first 36 bytes from returndata, which correspond to the signature plus bpt amount.\n returndatacopy(0x40, 0x24, sub(returndatasize(), 36))\n\n // We finally return the ABI-encoded uint256 and the array, which has a total length equal to\n // the size of returndata, plus the 32 bytes of the offset but without the 4 bytes of the\n // error signature.\n return(0, add(returndatasize(), 28))\n }\n default {\n // This call should always revert, but we fail nonetheless if that didn't happen\n invalid()\n }\n }\n } else {\n _upscaleArray(balances);\n\n (uint256 bptAmount, uint256[] memory tokenAmounts, ) = _action(\n poolId,\n sender,\n recipient,\n balances,\n lastChangeBlock,\n protocolSwapFeePercentage,\n userData\n );\n\n _downscaleArray(tokenAmounts);\n\n // solhint-disable-next-line no-inline-assembly\n assembly {\n // We will return a raw representation of `bptAmount` and `tokenAmounts` in memory, which is composed of\n // a 32-byte uint256, followed by a 32-byte for the array length, and finally the 32-byte uint256 values\n // Because revert expects a size in bytes, we multiply the array length (stored at `tokenAmounts`) by 32\n let size := mul(mload(tokenAmounts), 32)\n\n // We store the `bptAmount` in the previous slot to the `tokenAmounts` array. We can make sure there\n // will be at least one available slot due to how the memory scratch space works.\n // We can safely overwrite whatever is stored in this slot as we will revert immediately after that.\n let start := sub(tokenAmounts, 0x20)\n mstore(start, bptAmount)\n\n // We send one extra value for the error signature \"QueryError(uint256,uint256[])\" which is 0x43adbafb\n // We use the previous slot to `bptAmount`.\n mstore(sub(start, 0x20), 0x0000000000000000000000000000000000000000000000000000000043adbafb)\n start := sub(start, 0x04)\n\n // When copying from `tokenAmounts` into returndata, we copy the additional 68 bytes to also return\n // the `bptAmount`, the array length, and the error signature.\n revert(start, add(size, 68))\n }\n }\n }\n}\n" }, "contracts/lib/math/FixedPoint.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\nimport \"./LogExpMath.sol\";\nimport \"../helpers/BalancerErrors.sol\";\n\n/* solhint-disable private-vars-leading-underscore */\n\nlibrary FixedPoint {\n uint256 internal constant ONE = 1e18; // 18 decimal places\n uint256 internal constant MAX_POW_RELATIVE_ERROR = 10000; // 10^(-14)\n\n // Minimum base for the power function when the exponent is 'free' (larger than ONE).\n uint256 internal constant MIN_POW_BASE_FREE_EXPONENT = 0.7e18;\n\n function add(uint256 a, uint256 b) internal pure returns (uint256) {\n // Fixed Point addition is the same as regular checked addition\n\n uint256 c = a + b;\n _require(c >= a, Errors.ADD_OVERFLOW);\n return c;\n }\n\n function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n // Fixed Point addition is the same as regular checked addition\n\n _require(b <= a, Errors.SUB_OVERFLOW);\n uint256 c = a - b;\n return c;\n }\n\n function mulDown(uint256 a, uint256 b) internal pure returns (uint256) {\n uint256 product = a * b;\n _require(a == 0 || product / a == b, Errors.MUL_OVERFLOW);\n\n return product / ONE;\n }\n\n function mulUp(uint256 a, uint256 b) internal pure returns (uint256) {\n uint256 product = a * b;\n _require(a == 0 || product / a == b, Errors.MUL_OVERFLOW);\n\n if (product == 0) {\n return 0;\n } else {\n // The traditional divUp formula is:\n // divUp(x, y) := (x + y - 1) / y\n // To avoid intermediate overflow in the addition, we distribute the division and get:\n // divUp(x, y) := (x - 1) / y + 1\n // Note that this requires x != 0, which we already tested for.\n\n return ((product - 1) / ONE) + 1;\n }\n }\n\n function divDown(uint256 a, uint256 b) internal pure returns (uint256) {\n _require(b != 0, Errors.ZERO_DIVISION);\n\n if (a == 0) {\n return 0;\n } else {\n uint256 aInflated = a * ONE;\n _require(aInflated / a == ONE, Errors.DIV_INTERNAL); // mul overflow\n\n return aInflated / b;\n }\n }\n\n function divUp(uint256 a, uint256 b) internal pure returns (uint256) {\n _require(b != 0, Errors.ZERO_DIVISION);\n\n if (a == 0) {\n return 0;\n } else {\n uint256 aInflated = a * ONE;\n _require(aInflated / a == ONE, Errors.DIV_INTERNAL); // mul overflow\n\n // The traditional divUp formula is:\n // divUp(x, y) := (x + y - 1) / y\n // To avoid intermediate overflow in the addition, we distribute the division and get:\n // divUp(x, y) := (x - 1) / y + 1\n // Note that this requires x != 0, which we already tested for.\n\n return ((aInflated - 1) / b) + 1;\n }\n }\n\n /**\n * @dev Returns x^y, assuming both are fixed point numbers, rounding down. The result is guaranteed to not be above\n * the true value (that is, the error function expected - actual is always positive).\n */\n function powDown(uint256 x, uint256 y) internal pure returns (uint256) {\n uint256 raw = LogExpMath.pow(x, y);\n uint256 maxError = add(mulUp(raw, MAX_POW_RELATIVE_ERROR), 1);\n\n if (raw < maxError) {\n return 0;\n } else {\n return sub(raw, maxError);\n }\n }\n\n /**\n * @dev Returns x^y, assuming both are fixed point numbers, rounding up. The result is guaranteed to not be below\n * the true value (that is, the error function expected - actual is always negative).\n */\n function powUp(uint256 x, uint256 y) internal pure returns (uint256) {\n uint256 raw = LogExpMath.pow(x, y);\n uint256 maxError = add(mulUp(raw, MAX_POW_RELATIVE_ERROR), 1);\n\n return add(raw, maxError);\n }\n\n /**\n * @dev Returns the complement of a value (1 - x), capped to 0 if x is larger than 1.\n *\n * Useful when computing the complement for values with some level of relative error, as it strips this error and\n * prevents intermediate negative values.\n */\n function complement(uint256 x) internal pure returns (uint256) {\n return (x < ONE) ? (ONE - x) : 0;\n }\n}\n" }, "contracts/lib/helpers/InputHelpers.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\nimport \"../openzeppelin/IERC20.sol\";\n\nimport \"./BalancerErrors.sol\";\n\nimport \"../../vault/interfaces/IAsset.sol\";\n\nlibrary InputHelpers {\n function ensureInputLengthMatch(uint256 a, uint256 b) internal pure {\n _require(a == b, Errors.INPUT_LENGTH_MISMATCH);\n }\n\n function ensureInputLengthMatch(\n uint256 a,\n uint256 b,\n uint256 c\n ) internal pure {\n _require(a == b && b == c, Errors.INPUT_LENGTH_MISMATCH);\n }\n\n function ensureArrayIsSorted(IAsset[] memory array) internal pure {\n address[] memory addressArray;\n // solhint-disable-next-line no-inline-assembly\n assembly {\n addressArray := array\n }\n ensureArrayIsSorted(addressArray);\n }\n\n function ensureArrayIsSorted(IERC20[] memory array) internal pure {\n address[] memory addressArray;\n // solhint-disable-next-line no-inline-assembly\n assembly {\n addressArray := array\n }\n ensureArrayIsSorted(addressArray);\n }\n\n function ensureArrayIsSorted(address[] memory array) internal pure {\n if (array.length < 2) {\n return;\n }\n\n address previous = array[0];\n for (uint256 i = 1; i < array.length; ++i) {\n address current = array[i];\n _require(previous < current, Errors.UNSORTED_ARRAY);\n previous = current;\n }\n }\n}\n" }, "contracts/lib/helpers/TemporarilyPausable.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\nimport \"./BalancerErrors.sol\";\nimport \"./ITemporarilyPausable.sol\";\n\n/**\n * @dev Allows for a contract to be paused during an initial period after deployment, disabling functionality. Can be\n * used as an emergency switch in case a security vulnerability or threat is identified.\n *\n * The contract can only be paused during the Pause Window, a period that starts at deployment. It can also be\n * unpaused and repaused any number of times during this period. This is intended to serve as a safety measure: it lets\n * system managers react quickly to potentially dangerous situations, knowing that this action is reversible if careful\n * analysis later determines there was a false alarm.\n *\n * If the contract is paused when the Pause Window finishes, it will remain in the paused state through an additional\n * Buffer Period, after which it will be automatically unpaused forever. This is to ensure there is always enough time\n * to react to an emergency, even if the threat is discovered shortly before the Pause Window expires.\n *\n * Note that since the contract can only be paused within the Pause Window, unpausing during the Buffer Period is\n * irreversible.\n */\nabstract contract TemporarilyPausable is ITemporarilyPausable {\n // The Pause Window and Buffer Period are timestamp-based: they should not be relied upon for sub-minute accuracy.\n // solhint-disable not-rely-on-time\n\n uint256 private constant _MAX_PAUSE_WINDOW_DURATION = 90 days;\n uint256 private constant _MAX_BUFFER_PERIOD_DURATION = 30 days;\n\n uint256 private immutable _pauseWindowEndTime;\n uint256 private immutable _bufferPeriodEndTime;\n\n bool private _paused;\n\n constructor(uint256 pauseWindowDuration, uint256 bufferPeriodDuration) {\n _require(pauseWindowDuration <= _MAX_PAUSE_WINDOW_DURATION, Errors.MAX_PAUSE_WINDOW_DURATION);\n _require(bufferPeriodDuration <= _MAX_BUFFER_PERIOD_DURATION, Errors.MAX_BUFFER_PERIOD_DURATION);\n\n uint256 pauseWindowEndTime = block.timestamp + pauseWindowDuration;\n\n _pauseWindowEndTime = pauseWindowEndTime;\n _bufferPeriodEndTime = pauseWindowEndTime + bufferPeriodDuration;\n }\n\n /**\n * @dev Reverts if the contract is paused.\n */\n modifier whenNotPaused() {\n _ensureNotPaused();\n _;\n }\n\n /**\n * @dev Returns the current contract pause status, as well as the end times of the Pause Window and Buffer\n * Period.\n */\n function getPausedState()\n external\n view\n override\n returns (\n bool paused,\n uint256 pauseWindowEndTime,\n uint256 bufferPeriodEndTime\n )\n {\n paused = !_isNotPaused();\n pauseWindowEndTime = _getPauseWindowEndTime();\n bufferPeriodEndTime = _getBufferPeriodEndTime();\n }\n\n /**\n * @dev Sets the pause state to `paused`. The contract can only be paused until the end of the Pause Window, and\n * unpaused until the end of the Buffer Period.\n *\n * Once the Buffer Period expires, this function reverts unconditionally.\n */\n function _setPaused(bool paused) internal {\n if (paused) {\n _require(block.timestamp < _getPauseWindowEndTime(), Errors.PAUSE_WINDOW_EXPIRED);\n } else {\n _require(block.timestamp < _getBufferPeriodEndTime(), Errors.BUFFER_PERIOD_EXPIRED);\n }\n\n _paused = paused;\n emit PausedStateChanged(paused);\n }\n\n /**\n * @dev Reverts if the contract is paused.\n */\n function _ensureNotPaused() internal view {\n _require(_isNotPaused(), Errors.PAUSED);\n }\n\n /**\n * @dev Returns true if the contract is unpaused.\n *\n * Once the Buffer Period expires, the gas cost of calling this function is reduced dramatically, as storage is no\n * longer accessed.\n */\n function _isNotPaused() internal view returns (bool) {\n // After the Buffer Period, the (inexpensive) timestamp check short-circuits the storage access.\n return block.timestamp > _getBufferPeriodEndTime() || !_paused;\n }\n\n // These getters lead to reduced bytecode size by inlining the immutable variables in a single place.\n\n function _getPauseWindowEndTime() private view returns (uint256) {\n return _pauseWindowEndTime;\n }\n\n function _getBufferPeriodEndTime() private view returns (uint256) {\n return _bufferPeriodEndTime;\n }\n}\n" }, "contracts/lib/openzeppelin/ERC20.sol": { "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"../helpers/BalancerErrors.sol\";\n\nimport \"./IERC20.sol\";\nimport \"./SafeMath.sol\";\n\n/**\n * @dev Implementation of the {IERC20} interface.\n *\n * This implementation is agnostic to the way tokens are created. This means\n * that a supply mechanism has to be added in a derived contract using {_mint}.\n * For a generic mechanism see {ERC20PresetMinterPauser}.\n *\n * TIP: For a detailed writeup see our guide\n * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How\n * to implement supply mechanisms].\n *\n * We have followed general OpenZeppelin guidelines: functions revert instead\n * of returning `false` on failure. This behavior is nonetheless conventional\n * and does not conflict with the expectations of ERC20 applications.\n *\n * Additionally, an {Approval} event is emitted on calls to {transferFrom}.\n * This allows applications to reconstruct the allowance for all accounts just\n * by listening to said events. Other implementations of the EIP may not emit\n * these events, as it isn't required by the specification.\n *\n * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}\n * functions have been added to mitigate the well-known issues around setting\n * allowances. See {IERC20-approve}.\n */\ncontract ERC20 is IERC20 {\n using SafeMath for uint256;\n\n mapping(address => uint256) private _balances;\n\n mapping(address => mapping(address => uint256)) private _allowances;\n\n uint256 private _totalSupply;\n\n string private _name;\n string private _symbol;\n uint8 private _decimals;\n\n /**\n * @dev Sets the values for {name} and {symbol}, initializes {decimals} with\n * a default value of 18.\n *\n * To select a different value for {decimals}, use {_setupDecimals}.\n *\n * All three of these values are immutable: they can only be set once during\n * construction.\n */\n constructor(string memory name_, string memory symbol_) {\n _name = name_;\n _symbol = symbol_;\n _decimals = 18;\n }\n\n /**\n * @dev Returns the name of the token.\n */\n function name() public view returns (string memory) {\n return _name;\n }\n\n /**\n * @dev Returns the symbol of the token, usually a shorter version of the\n * name.\n */\n function symbol() public view returns (string memory) {\n return _symbol;\n }\n\n /**\n * @dev Returns the number of decimals used to get its user representation.\n * For example, if `decimals` equals `2`, a balance of `505` tokens should\n * be displayed to a user as `5,05` (`505 / 10 ** 2`).\n *\n * Tokens usually opt for a value of 18, imitating the relationship between\n * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is\n * called.\n *\n * NOTE: This information is only used for _display_ purposes: it in\n * no way affects any of the arithmetic of the contract, including\n * {IERC20-balanceOf} and {IERC20-transfer}.\n */\n function decimals() public view returns (uint8) {\n return _decimals;\n }\n\n /**\n * @dev See {IERC20-totalSupply}.\n */\n function totalSupply() public view override returns (uint256) {\n return _totalSupply;\n }\n\n /**\n * @dev See {IERC20-balanceOf}.\n */\n function balanceOf(address account) public view override returns (uint256) {\n return _balances[account];\n }\n\n /**\n * @dev See {IERC20-transfer}.\n *\n * Requirements:\n *\n * - `recipient` cannot be the zero address.\n * - the caller must have a balance of at least `amount`.\n */\n function transfer(address recipient, uint256 amount) public virtual override returns (bool) {\n _transfer(msg.sender, recipient, amount);\n return true;\n }\n\n /**\n * @dev See {IERC20-allowance}.\n */\n function allowance(address owner, address spender) public view virtual override returns (uint256) {\n return _allowances[owner][spender];\n }\n\n /**\n * @dev See {IERC20-approve}.\n *\n * Requirements:\n *\n * - `spender` cannot be the zero address.\n */\n function approve(address spender, uint256 amount) public virtual override returns (bool) {\n _approve(msg.sender, spender, amount);\n return true;\n }\n\n /**\n * @dev See {IERC20-transferFrom}.\n *\n * Emits an {Approval} event indicating the updated allowance. This is not\n * required by the EIP. See the note at the beginning of {ERC20}.\n *\n * Requirements:\n *\n * - `sender` and `recipient` cannot be the zero address.\n * - `sender` must have a balance of at least `amount`.\n * - the caller must have allowance for ``sender``'s tokens of at least\n * `amount`.\n */\n function transferFrom(\n address sender,\n address recipient,\n uint256 amount\n ) public virtual override returns (bool) {\n _transfer(sender, recipient, amount);\n _approve(\n sender,\n msg.sender,\n _allowances[sender][msg.sender].sub(amount, Errors.ERC20_TRANSFER_EXCEEDS_ALLOWANCE)\n );\n return true;\n }\n\n /**\n * @dev Atomically increases the allowance granted to `spender` by the caller.\n *\n * This is an alternative to {approve} that can be used as a mitigation for\n * problems described in {IERC20-approve}.\n *\n * Emits an {Approval} event indicating the updated allowance.\n *\n * Requirements:\n *\n * - `spender` cannot be the zero address.\n */\n function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {\n _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));\n return true;\n }\n\n /**\n * @dev Atomically decreases the allowance granted to `spender` by the caller.\n *\n * This is an alternative to {approve} that can be used as a mitigation for\n * problems described in {IERC20-approve}.\n *\n * Emits an {Approval} event indicating the updated allowance.\n *\n * Requirements:\n *\n * - `spender` cannot be the zero address.\n * - `spender` must have allowance for the caller of at least\n * `subtractedValue`.\n */\n function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {\n _approve(\n msg.sender,\n spender,\n _allowances[msg.sender][spender].sub(subtractedValue, Errors.ERC20_DECREASED_ALLOWANCE_BELOW_ZERO)\n );\n return true;\n }\n\n /**\n * @dev Moves tokens `amount` from `sender` to `recipient`.\n *\n * This is internal function is equivalent to {transfer}, and can be used to\n * e.g. implement automatic token fees, slashing mechanisms, etc.\n *\n * Emits a {Transfer} event.\n *\n * Requirements:\n *\n * - `sender` cannot be the zero address.\n * - `recipient` cannot be the zero address.\n * - `sender` must have a balance of at least `amount`.\n */\n function _transfer(\n address sender,\n address recipient,\n uint256 amount\n ) internal virtual {\n _require(sender != address(0), Errors.ERC20_TRANSFER_FROM_ZERO_ADDRESS);\n _require(recipient != address(0), Errors.ERC20_TRANSFER_TO_ZERO_ADDRESS);\n\n _beforeTokenTransfer(sender, recipient, amount);\n\n _balances[sender] = _balances[sender].sub(amount, Errors.ERC20_TRANSFER_EXCEEDS_BALANCE);\n _balances[recipient] = _balances[recipient].add(amount);\n emit Transfer(sender, recipient, amount);\n }\n\n /** @dev Creates `amount` tokens and assigns them to `account`, increasing\n * the total supply.\n *\n * Emits a {Transfer} event with `from` set to the zero address.\n *\n * Requirements:\n *\n * - `to` cannot be the zero address.\n */\n function _mint(address account, uint256 amount) internal virtual {\n _require(account != address(0), Errors.ERC20_MINT_TO_ZERO_ADDRESS);\n\n _beforeTokenTransfer(address(0), account, amount);\n\n _totalSupply = _totalSupply.add(amount);\n _balances[account] = _balances[account].add(amount);\n emit Transfer(address(0), account, amount);\n }\n\n /**\n * @dev Destroys `amount` tokens from `account`, reducing the\n * total supply.\n *\n * Emits a {Transfer} event with `to` set to the zero address.\n *\n * Requirements:\n *\n * - `account` cannot be the zero address.\n * - `account` must have at least `amount` tokens.\n */\n function _burn(address account, uint256 amount) internal virtual {\n _require(account != address(0), Errors.ERC20_BURN_FROM_ZERO_ADDRESS);\n\n _beforeTokenTransfer(account, address(0), amount);\n\n _balances[account] = _balances[account].sub(amount, Errors.ERC20_BURN_EXCEEDS_ALLOWANCE);\n _totalSupply = _totalSupply.sub(amount);\n emit Transfer(account, address(0), amount);\n }\n\n /**\n * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.\n *\n * This internal function is equivalent to `approve`, and can be used to\n * e.g. set automatic allowances for certain subsystems, etc.\n *\n * Emits an {Approval} event.\n *\n * Requirements:\n *\n * - `owner` cannot be the zero address.\n * - `spender` cannot be the zero address.\n */\n function _approve(\n address owner,\n address spender,\n uint256 amount\n ) internal virtual {\n _require(owner != address(0), Errors.ERC20_APPROVE_FROM_ZERO_ADDRESS);\n _require(spender != address(0), Errors.ERC20_APPROVE_TO_ZERO_ADDRESS);\n\n _allowances[owner][spender] = amount;\n emit Approval(owner, spender, amount);\n }\n\n /**\n * @dev Sets {decimals} to a value other than the default one of 18.\n *\n * WARNING: This function should only be called from the constructor. Most\n * applications that interact with token contracts will not expect\n * {decimals} to ever change, and may work incorrectly if it does.\n */\n function _setupDecimals(uint8 decimals_) internal {\n _decimals = decimals_;\n }\n\n /**\n * @dev Hook that is called before any transfer of tokens. This includes\n * minting and burning.\n *\n * Calling conditions:\n *\n * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\n * will be to transferred to `to`.\n * - when `from` is zero, `amount` tokens will be minted for `to`.\n * - when `to` is zero, `amount` of ``from``'s tokens will be burned.\n * - `from` and `to` are never both zero.\n *\n * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n */\n function _beforeTokenTransfer(\n address from,\n address to,\n uint256 amount\n ) internal virtual {}\n}\n" }, "contracts/pools/weighted/WeightedMath.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\nimport \"../../lib/math/FixedPoint.sol\";\nimport \"../../lib/math/Math.sol\";\nimport \"../../lib/helpers/InputHelpers.sol\";\n\n/* solhint-disable private-vars-leading-underscore */\n\ncontract WeightedMath {\n using FixedPoint for uint256;\n // A minimum normalized weight imposes a maximum weight ratio. We need this due to limitations in the\n // implementation of the power function, as these ratios are often exponents.\n uint256 internal constant _MIN_WEIGHT = 0.01e18;\n // Having a minimum normalized weight imposes a limit on the maximum number of tokens;\n // i.e., the largest possible pool is one where all tokens have exactly the minimum weight.\n uint256 internal constant _MAX_WEIGHTED_TOKENS = 100;\n\n // Pool limits that arise from limitations in the fixed point power function (and the imposed 1:100 maximum weight\n // ratio).\n\n // Swap limits: amounts swapped may not be larger than this percentage of total balance.\n uint256 internal constant _MAX_IN_RATIO = 0.3e18;\n uint256 internal constant _MAX_OUT_RATIO = 0.3e18;\n\n // Invariant growth limit: non-proportional joins cannot cause the invariant to increase by more than this ratio.\n uint256 internal constant _MAX_INVARIANT_RATIO = 3e18;\n // Invariant shrink limit: non-proportional exits cannot cause the invariant to decrease by less than this ratio.\n uint256 internal constant _MIN_INVARIANT_RATIO = 0.7e18;\n\n // Invariant is used to collect protocol swap fees by comparing its value between two times.\n // So we can round always to the same direction. It is also used to initiate the BPT amount\n // and, because there is a minimum BPT, we round down the invariant.\n function _calculateInvariant(uint256[] memory normalizedWeights, uint256[] memory balances)\n internal\n pure\n returns (uint256 invariant)\n {\n /**********************************************************************************************\n // invariant _____ //\n // wi = weight index i | | wi //\n // bi = balance index i | | bi ^ = i //\n // i = invariant //\n **********************************************************************************************/\n\n invariant = FixedPoint.ONE;\n for (uint256 i = 0; i < normalizedWeights.length; i++) {\n invariant = invariant.mulDown(balances[i].powDown(normalizedWeights[i]));\n }\n\n _require(invariant > 0, Errors.ZERO_INVARIANT);\n }\n\n // Computes how many tokens can be taken out of a pool if `amountIn` are sent, given the\n // current balances and weights.\n function _calcOutGivenIn(\n uint256 balanceIn,\n uint256 weightIn,\n uint256 balanceOut,\n uint256 weightOut,\n uint256 amountIn\n ) internal pure returns (uint256) {\n /**********************************************************************************************\n // outGivenIn //\n // aO = amountOut //\n // bO = balanceOut //\n // bI = balanceIn / / bI \\ (wI / wO) \\ //\n // aI = amountIn aO = bO * | 1 - | -------------------------- | ^ | //\n // wI = weightIn \\ \\ ( bI + aI ) / / //\n // wO = weightOut //\n **********************************************************************************************/\n\n // Amount out, so we round down overall.\n\n // The multiplication rounds down, and the subtrahend (power) rounds up (so the base rounds up too).\n // Because bI / (bI + aI) <= 1, the exponent rounds down.\n\n // Cannot exceed maximum in ratio\n _require(amountIn <= balanceIn.mulDown(_MAX_IN_RATIO), Errors.MAX_IN_RATIO);\n\n uint256 denominator = balanceIn.add(amountIn);\n uint256 base = balanceIn.divUp(denominator);\n uint256 exponent = weightIn.divDown(weightOut);\n uint256 power = base.powUp(exponent);\n\n return balanceOut.mulDown(power.complement());\n }\n\n // Computes how many tokens must be sent to a pool in order to take `amountOut`, given the\n // current balances and weights.\n function _calcInGivenOut(\n uint256 balanceIn,\n uint256 weightIn,\n uint256 balanceOut,\n uint256 weightOut,\n uint256 amountOut\n ) internal pure returns (uint256) {\n /**********************************************************************************************\n // inGivenOut //\n // aO = amountOut //\n // bO = balanceOut //\n // bI = balanceIn / / bO \\ (wO / wI) \\ //\n // aI = amountIn aI = bI * | | -------------------------- | ^ - 1 | //\n // wI = weightIn \\ \\ ( bO - aO ) / / //\n // wO = weightOut //\n **********************************************************************************************/\n\n // Amount in, so we round up overall.\n\n // The multiplication rounds up, and the power rounds up (so the base rounds up too).\n // Because b0 / (b0 - a0) >= 1, the exponent rounds up.\n\n // Cannot exceed maximum out ratio\n _require(amountOut <= balanceOut.mulDown(_MAX_OUT_RATIO), Errors.MAX_OUT_RATIO);\n\n uint256 base = balanceOut.divUp(balanceOut.sub(amountOut));\n uint256 exponent = weightOut.divUp(weightIn);\n uint256 power = base.powUp(exponent);\n\n // Because the base is larger than one (and the power rounds up), the power should always be larger than one, so\n // the following subtraction should never revert.\n uint256 ratio = power.sub(FixedPoint.ONE);\n\n return balanceIn.mulUp(ratio);\n }\n\n function _calcBptOutGivenExactTokensIn(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n uint256[] memory amountsIn,\n uint256 bptTotalSupply,\n uint256 swapFee\n ) internal pure returns (uint256) {\n // BPT out, so we round down overall.\n\n uint256[] memory balanceRatiosWithFee = new uint256[](amountsIn.length);\n\n uint256 invariantRatioWithFees = 0;\n for (uint256 i = 0; i < balances.length; i++) {\n balanceRatiosWithFee[i] = balances[i].add(amountsIn[i]).divDown(balances[i]);\n invariantRatioWithFees = invariantRatioWithFees.add(balanceRatiosWithFee[i].mulDown(normalizedWeights[i]));\n }\n\n uint256 invariantRatio = FixedPoint.ONE;\n for (uint256 i = 0; i < balances.length; i++) {\n uint256 amountInWithoutFee;\n\n if (balanceRatiosWithFee[i] > invariantRatioWithFees) {\n uint256 nonTaxableAmount = balances[i].mulDown(invariantRatioWithFees.sub(FixedPoint.ONE));\n uint256 taxableAmount = amountsIn[i].sub(nonTaxableAmount);\n amountInWithoutFee = nonTaxableAmount.add(taxableAmount.mulDown(FixedPoint.ONE.sub(swapFee)));\n } else {\n amountInWithoutFee = amountsIn[i];\n }\n\n uint256 balanceRatio = balances[i].add(amountInWithoutFee).divDown(balances[i]);\n\n invariantRatio = invariantRatio.mulDown(balanceRatio.powDown(normalizedWeights[i]));\n }\n\n if (invariantRatio >= FixedPoint.ONE) {\n return bptTotalSupply.mulDown(invariantRatio.sub(FixedPoint.ONE));\n } else {\n return 0;\n }\n }\n\n function _calcTokenInGivenExactBptOut(\n uint256 balance,\n uint256 normalizedWeight,\n uint256 bptAmountOut,\n uint256 bptTotalSupply,\n uint256 swapFee\n ) internal pure returns (uint256) {\n /******************************************************************************************\n // tokenInForExactBPTOut //\n // a = amountIn //\n // b = balance / / totalBPT + bptOut \\ (1 / w) \\ //\n // bptOut = bptAmountOut a = b * | | -------------------------- | ^ - 1 | //\n // bpt = totalBPT \\ \\ totalBPT / / //\n // w = weight //\n ******************************************************************************************/\n\n // Token in, so we round up overall.\n\n // Calculate the factor by which the invariant will increase after minting BPTAmountOut\n uint256 invariantRatio = bptTotalSupply.add(bptAmountOut).divUp(bptTotalSupply);\n _require(invariantRatio <= _MAX_INVARIANT_RATIO, Errors.MAX_OUT_BPT_FOR_TOKEN_IN);\n\n // Calculate by how much the token balance has to increase to match the invariantRatio\n uint256 balanceRatio = invariantRatio.powUp(FixedPoint.ONE.divUp(normalizedWeight));\n\n uint256 amountInWithoutFee = balance.mulUp(balanceRatio.sub(FixedPoint.ONE));\n\n // We can now compute how much extra balance is being deposited and used in virtual swaps, and charge swap fees\n // accordingly.\n uint256 taxablePercentage = normalizedWeight.complement();\n uint256 taxableAmount = amountInWithoutFee.mulUp(taxablePercentage);\n uint256 nonTaxableAmount = amountInWithoutFee.sub(taxableAmount);\n\n return nonTaxableAmount.add(taxableAmount.divUp(swapFee.complement()));\n }\n\n function _calcBptInGivenExactTokensOut(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n uint256[] memory amountsOut,\n uint256 bptTotalSupply,\n uint256 swapFee\n ) internal pure returns (uint256) {\n // BPT in, so we round up overall.\n\n uint256[] memory balanceRatiosWithoutFee = new uint256[](amountsOut.length);\n uint256 invariantRatioWithoutFees = 0;\n for (uint256 i = 0; i < balances.length; i++) {\n balanceRatiosWithoutFee[i] = balances[i].sub(amountsOut[i]).divUp(balances[i]);\n invariantRatioWithoutFees = invariantRatioWithoutFees.add(\n balanceRatiosWithoutFee[i].mulUp(normalizedWeights[i])\n );\n }\n\n uint256 invariantRatio = FixedPoint.ONE;\n for (uint256 i = 0; i < balances.length; i++) {\n // Swap fees are typically charged on 'token in', but there is no 'token in' here, so we apply it to\n // 'token out'. This results in slightly larger price impact.\n\n uint256 amountOutWithFee;\n if (invariantRatioWithoutFees > balanceRatiosWithoutFee[i]) {\n uint256 nonTaxableAmount = balances[i].mulDown(invariantRatioWithoutFees.complement());\n uint256 taxableAmount = amountsOut[i].sub(nonTaxableAmount);\n\n amountOutWithFee = nonTaxableAmount.add(taxableAmount.divUp(swapFee.complement()));\n } else {\n amountOutWithFee = amountsOut[i];\n }\n\n uint256 balanceRatio = balances[i].sub(amountOutWithFee).divDown(balances[i]);\n\n invariantRatio = invariantRatio.mulDown(balanceRatio.powDown(normalizedWeights[i]));\n }\n\n return bptTotalSupply.mulUp(invariantRatio.complement());\n }\n\n function _calcTokenOutGivenExactBptIn(\n uint256 balance,\n uint256 normalizedWeight,\n uint256 bptAmountIn,\n uint256 bptTotalSupply,\n uint256 swapFee\n ) internal pure returns (uint256) {\n /*****************************************************************************************\n // exactBPTInForTokenOut //\n // a = amountOut //\n // b = balance / / totalBPT - bptIn \\ (1 / w) \\ //\n // bptIn = bptAmountIn a = b * | 1 - | -------------------------- | ^ | //\n // bpt = totalBPT \\ \\ totalBPT / / //\n // w = weight //\n *****************************************************************************************/\n\n // Token out, so we round down overall. The multiplication rounds down, but the power rounds up (so the base\n // rounds up). Because (totalBPT - bptIn) / totalBPT <= 1, the exponent rounds down.\n\n // Calculate the factor by which the invariant will decrease after burning BPTAmountIn\n uint256 invariantRatio = bptTotalSupply.sub(bptAmountIn).divUp(bptTotalSupply);\n _require(invariantRatio >= _MIN_INVARIANT_RATIO, Errors.MIN_BPT_IN_FOR_TOKEN_OUT);\n\n // Calculate by how much the token balance has to decrease to match invariantRatio\n uint256 balanceRatio = invariantRatio.powUp(FixedPoint.ONE.divDown(normalizedWeight));\n\n // Because of rounding up, balanceRatio can be greater than one. Using complement prevents reverts.\n uint256 amountOutWithoutFee = balance.mulDown(balanceRatio.complement());\n\n // We can now compute how much excess balance is being withdrawn as a result of the virtual swaps, which result\n // in swap fees.\n uint256 taxablePercentage = normalizedWeight.complement();\n\n // Swap fees are typically charged on 'token in', but there is no 'token in' here, so we apply it\n // to 'token out'. This results in slightly larger price impact. Fees are rounded up.\n uint256 taxableAmount = amountOutWithoutFee.mulUp(taxablePercentage);\n uint256 nonTaxableAmount = amountOutWithoutFee.sub(taxableAmount);\n\n return nonTaxableAmount.add(taxableAmount.mulDown(swapFee.complement()));\n }\n\n function _calcTokensOutGivenExactBptIn(\n uint256[] memory balances,\n uint256 bptAmountIn,\n uint256 totalBPT\n ) internal pure returns (uint256[] memory) {\n /**********************************************************************************************\n // exactBPTInForTokensOut //\n // (per token) //\n // aO = amountOut / bptIn \\ //\n // b = balance a0 = b * | --------------------- | //\n // bptIn = bptAmountIn \\ totalBPT / //\n // bpt = totalBPT //\n **********************************************************************************************/\n\n // Since we're computing an amount out, we round down overall. This means rounding down on both the\n // multiplication and division.\n\n uint256 bptRatio = bptAmountIn.divDown(totalBPT);\n\n uint256[] memory amountsOut = new uint256[](balances.length);\n for (uint256 i = 0; i < balances.length; i++) {\n amountsOut[i] = balances[i].mulDown(bptRatio);\n }\n\n return amountsOut;\n }\n\n function _calcDueTokenProtocolSwapFeeAmount(\n uint256 balance,\n uint256 normalizedWeight,\n uint256 previousInvariant,\n uint256 currentInvariant,\n uint256 protocolSwapFeePercentage\n ) internal pure returns (uint256) {\n /*********************************************************************************\n /* protocolSwapFeePercentage * balanceToken * ( 1 - (previousInvariant / currentInvariant) ^ (1 / weightToken))\n *********************************************************************************/\n\n if (currentInvariant <= previousInvariant) {\n // This shouldn't happen outside of rounding errors, but have this safeguard nonetheless to prevent the Pool\n // from entering a locked state in which joins and exits revert while computing accumulated swap fees.\n return 0;\n }\n\n // We round down to prevent issues in the Pool's accounting, even if it means paying slightly less in protocol\n // fees to the Vault.\n\n // Fee percentage and balance multiplications round down, while the subtrahend (power) rounds up (as does the\n // base). Because previousInvariant / currentInvariant <= 1, the exponent rounds down.\n\n uint256 base = previousInvariant.divUp(currentInvariant);\n uint256 exponent = FixedPoint.ONE.divDown(normalizedWeight);\n\n // Because the exponent is larger than one, the base of the power function has a lower bound. We cap to this\n // value to avoid numeric issues, which means in the extreme case (where the invariant growth is larger than\n // 1 / min exponent) the Pool will pay less in protocol fees than it should.\n base = Math.max(base, FixedPoint.MIN_POW_BASE_FREE_EXPONENT);\n\n uint256 power = base.powUp(exponent);\n\n uint256 tokenAccruedFees = balance.mulDown(power.complement());\n return tokenAccruedFees.mulDown(protocolSwapFeePercentage);\n }\n}\n" }, "contracts/pools/weighted/WeightedOracleMath.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\nimport \"../../lib/math//LogExpMath.sol\";\nimport \"../../lib/math/FixedPoint.sol\";\nimport \"../../lib/math/Math.sol\";\nimport \"../../lib/helpers/InputHelpers.sol\";\n\n/* solhint-disable private-vars-leading-underscore */\n\ncontract WeightedOracleMath {\n using FixedPoint for uint256;\n\n int256 private constant _LOG_COMPRESSION_FACTOR = 1e14;\n int256 private constant _HALF_LOG_COMPRESSION_FACTOR = 0.5e14;\n\n /**\n * @dev Calculates the logarithm of the spot price of token B in token A.\n *\n * The return value is a 4 decimal fixed-point number: use `_fromLowResLog` to recover the original value.\n */\n function _calcLogSpotPrice(\n uint256 normalizedWeightA,\n uint256 balanceA,\n uint256 normalizedWeightB,\n uint256 balanceB\n ) internal pure returns (int256) {\n // Max balances are 2^112 and min weights are 0.01, so the division never overflows.\n\n // The rounding direction is irrelevant as we're about to introduce a much larger error when converting to log\n // space. We use `divUp` as it prevents the result from being zero, which would make the logarithm revert. A\n // result of zero is therefore only possible with zero balances, which are prevented via other means.\n uint256 spotPrice = balanceA.divUp(normalizedWeightA).divUp(balanceB.divUp(normalizedWeightB));\n return _toLowResLog(spotPrice);\n }\n\n /**\n * @dev Calculates the price of BPT in a token. `logBptTotalSupply` should be the result of calling `_toLowResLog`\n * with the current BPT supply.\n *\n * The return value is a 4 decimal fixed-point number: use `_fromLowResLog` to recover the original value.\n */\n function _calcLogBPTPrice(\n uint256 normalizedWeight,\n uint256 balance,\n int256 logBptTotalSupply\n ) internal pure returns (int256) {\n // BPT price = (balance / weight) / total supply\n // Since we already have ln(total supply) and want to compute ln(BPT price), we perform the computation in log\n // space directly: ln(BPT price) = ln(balance / weight) - ln(total supply)\n\n // The rounding direction is irrelevant as we're about to introduce a much larger error when converting to log\n // space. We use `divUp` as it prevents the result from being zero, which would make the logarithm revert. A\n // result of zero is therefore only possible with zero balances, which are prevented via other means.\n int256 logBalanceOverWeight = _toLowResLog(balance.divUp(normalizedWeight));\n\n // Because we're subtracting two values in log space, this value has a larger error (+-0.0001 instead of\n // +-0.00005), which results in a final larger relative error of around 0.1%.\n return logBalanceOverWeight - logBptTotalSupply;\n }\n\n /**\n * @dev Returns the natural logarithm of `value`, dropping most of the decimal places to arrive at a value that,\n * when passed to `_fromLowResLog`, will have a maximum relative error of ~0.05% compared to `value`.\n *\n * Values returned from this function should not be mixed with other fixed-point values (as they have a different\n * number of digits), but can be added or subtracted. Use `_fromLowResLog` to undo this process and return to an\n * 18 decimal places fixed point value.\n *\n * Because so much precision is lost, the logarithmic values can be stored using much fewer bits than the original\n * value required.\n */\n function _toLowResLog(uint256 value) internal pure returns (int256) {\n int256 ln = LogExpMath.ln(int256(value));\n\n // Rounding division for signed numerator\n return\n (ln > 0 ? ln + _HALF_LOG_COMPRESSION_FACTOR : ln - _HALF_LOG_COMPRESSION_FACTOR) / _LOG_COMPRESSION_FACTOR;\n }\n\n /**\n * @dev Restores `value` from logarithmic space. `value` is expected to be the result of a call to `_toLowResLog`,\n * any other function that returns 4 decimals fixed point logarithms, or the sum of such values.\n */\n function _fromLowResLog(int256 value) internal pure returns (uint256) {\n return uint256(LogExpMath.exp(value * _LOG_COMPRESSION_FACTOR));\n }\n}\n" }, "contracts/pools/weighted/WeightedPool2TokensMiscData.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../../lib/helpers/WordCodec.sol\";\n\n/**\n * @dev This module provides an interface to store seemingly unrelated pieces of information, in particular used by\n * Weighted Pools of 2 tokens with a price oracle.\n *\n * These pieces of information are all kept together in a single storage slot to reduce the number of storage reads. In\n * particular, we not only store configuration values (such as the swap fee percentage), but also cache\n * reduced-precision versions of the total BPT supply and invariant, which lets us not access nor compute these values\n * when producing oracle updates during a swap.\n *\n * Data is stored with the following structure:\n *\n * [ swap fee pct | oracle enabled | oracle index | oracle sample initial timestamp | log supply | log invariant ]\n * [ uint64 | bool | uint10 | uint31 | int22 | int22 ]\n *\n * Note that we are not using the most-significant 106 bits.\n */\nlibrary WeightedPool2TokensMiscData {\n using WordCodec for bytes32;\n using WordCodec for uint256;\n\n uint256 private constant _LOG_INVARIANT_OFFSET = 0;\n uint256 private constant _LOG_TOTAL_SUPPLY_OFFSET = 22;\n uint256 private constant _ORACLE_SAMPLE_CREATION_TIMESTAMP_OFFSET = 44;\n uint256 private constant _ORACLE_INDEX_OFFSET = 75;\n uint256 private constant _ORACLE_ENABLED_OFFSET = 85;\n uint256 private constant _SWAP_FEE_PERCENTAGE_OFFSET = 86;\n\n /**\n * @dev Returns the cached logarithm of the invariant.\n */\n function logInvariant(bytes32 data) internal pure returns (int256) {\n return data.decodeInt22(_LOG_INVARIANT_OFFSET);\n }\n\n /**\n * @dev Returns the cached logarithm of the total supply.\n */\n function logTotalSupply(bytes32 data) internal pure returns (int256) {\n return data.decodeInt22(_LOG_TOTAL_SUPPLY_OFFSET);\n }\n\n /**\n * @dev Returns the timestamp of the creation of the oracle's latest sample.\n */\n function oracleSampleCreationTimestamp(bytes32 data) internal pure returns (uint256) {\n return data.decodeUint31(_ORACLE_SAMPLE_CREATION_TIMESTAMP_OFFSET);\n }\n\n /**\n * @dev Returns the index of the oracle's latest sample.\n */\n function oracleIndex(bytes32 data) internal pure returns (uint256) {\n return data.decodeUint10(_ORACLE_INDEX_OFFSET);\n }\n\n /**\n * @dev Returns true if the oracle is enabled.\n */\n function oracleEnabled(bytes32 data) internal pure returns (bool) {\n return data.decodeBool(_ORACLE_ENABLED_OFFSET);\n }\n\n /**\n * @dev Returns the swap fee percentage.\n */\n function swapFeePercentage(bytes32 data) internal pure returns (uint256) {\n return data.decodeUint64(_SWAP_FEE_PERCENTAGE_OFFSET);\n }\n\n /**\n * @dev Sets the logarithm of the invariant in `data`, returning the updated value.\n */\n function setLogInvariant(bytes32 data, int256 _logInvariant) internal pure returns (bytes32) {\n return data.insertInt22(_logInvariant, _LOG_INVARIANT_OFFSET);\n }\n\n /**\n * @dev Sets the logarithm of the total supply in `data`, returning the updated value.\n */\n function setLogTotalSupply(bytes32 data, int256 _logTotalSupply) internal pure returns (bytes32) {\n return data.insertInt22(_logTotalSupply, _LOG_TOTAL_SUPPLY_OFFSET);\n }\n\n /**\n * @dev Sets the timestamp of the creation of the oracle's latest sample in `data`, returning the updated value.\n */\n function setOracleSampleCreationTimestamp(bytes32 data, uint256 _initialTimestamp) internal pure returns (bytes32) {\n return data.insertUint31(_initialTimestamp, _ORACLE_SAMPLE_CREATION_TIMESTAMP_OFFSET);\n }\n\n /**\n * @dev Sets the index of the oracle's latest sample in `data`, returning the updated value.\n */\n function setOracleIndex(bytes32 data, uint256 _oracleIndex) internal pure returns (bytes32) {\n return data.insertUint10(_oracleIndex, _ORACLE_INDEX_OFFSET);\n }\n\n /**\n * @dev Enables or disables the oracle in `data`, returning the updated value.\n */\n function setOracleEnabled(bytes32 data, bool _oracleEnabled) internal pure returns (bytes32) {\n return data.insertBoolean(_oracleEnabled, _ORACLE_ENABLED_OFFSET);\n }\n\n /**\n * @dev Sets the swap fee percentage in `data`, returning the updated value.\n */\n function setSwapFeePercentage(bytes32 data, uint256 _swapFeePercentage) internal pure returns (bytes32) {\n return data.insertUint64(_swapFeePercentage, _SWAP_FEE_PERCENTAGE_OFFSET);\n }\n}\n" }, "contracts/pools/weighted/WeightedPoolUserDataHelpers.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\nimport \"../../lib/openzeppelin/IERC20.sol\";\n\nimport \"./WeightedPool.sol\";\n\nlibrary WeightedPoolUserDataHelpers {\n function joinKind(bytes memory self) internal pure returns (WeightedPool.JoinKind) {\n return abi.decode(self, (WeightedPool.JoinKind));\n }\n\n function exitKind(bytes memory self) internal pure returns (WeightedPool.ExitKind) {\n return abi.decode(self, (WeightedPool.ExitKind));\n }\n\n // Joins\n\n function initialAmountsIn(bytes memory self) internal pure returns (uint256[] memory amountsIn) {\n (, amountsIn) = abi.decode(self, (WeightedPool.JoinKind, uint256[]));\n }\n\n function exactTokensInForBptOut(bytes memory self)\n internal\n pure\n returns (uint256[] memory amountsIn, uint256 minBPTAmountOut)\n {\n (, amountsIn, minBPTAmountOut) = abi.decode(self, (WeightedPool.JoinKind, uint256[], uint256));\n }\n\n function tokenInForExactBptOut(bytes memory self) internal pure returns (uint256 bptAmountOut, uint256 tokenIndex) {\n (, bptAmountOut, tokenIndex) = abi.decode(self, (WeightedPool.JoinKind, uint256, uint256));\n }\n\n // Exits\n\n function exactBptInForTokenOut(bytes memory self) internal pure returns (uint256 bptAmountIn, uint256 tokenIndex) {\n (, bptAmountIn, tokenIndex) = abi.decode(self, (WeightedPool.ExitKind, uint256, uint256));\n }\n\n function exactBptInForTokensOut(bytes memory self) internal pure returns (uint256 bptAmountIn) {\n (, bptAmountIn) = abi.decode(self, (WeightedPool.ExitKind, uint256));\n }\n\n function bptInForExactTokensOut(bytes memory self)\n internal\n pure\n returns (uint256[] memory amountsOut, uint256 maxBPTAmountIn)\n {\n (, amountsOut, maxBPTAmountIn) = abi.decode(self, (WeightedPool.ExitKind, uint256[], uint256));\n }\n}\n" }, "contracts/pools/BalancerPoolToken.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\nimport \"../lib/math/Math.sol\";\nimport \"../lib/openzeppelin/IERC20.sol\";\nimport \"../lib/openzeppelin/IERC20Permit.sol\";\nimport \"../lib/openzeppelin/EIP712.sol\";\n\n/**\n * @title Highly opinionated token implementation\n * @author Balancer Labs\n * @dev\n * - Includes functions to increase and decrease allowance as a workaround\n * for the well-known issue with `approve`:\n * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n * - Allows for 'infinite allowance', where an allowance of 0xff..ff is not\n * decreased by calls to transferFrom\n * - Lets a token holder use `transferFrom` to send their own tokens,\n * without first setting allowance\n * - Emits 'Approval' events whenever allowance is changed by `transferFrom`\n */\ncontract BalancerPoolToken is IERC20, IERC20Permit, EIP712 {\n using Math for uint256;\n\n // State variables\n\n uint8 private constant _DECIMALS = 18;\n\n mapping(address => uint256) private _balance;\n mapping(address => mapping(address => uint256)) private _allowance;\n uint256 private _totalSupply;\n\n string private _name;\n string private _symbol;\n\n mapping(address => uint256) private _nonces;\n\n // solhint-disable-next-line var-name-mixedcase\n bytes32 private immutable _PERMIT_TYPE_HASH = keccak256(\n \"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\"\n );\n\n // Function declarations\n\n constructor(string memory tokenName, string memory tokenSymbol) EIP712(tokenName, \"1\") {\n _name = tokenName;\n _symbol = tokenSymbol;\n }\n\n // External functions\n\n function allowance(address owner, address spender) external view override returns (uint256) {\n return _allowance[owner][spender];\n }\n\n function balanceOf(address account) external view override returns (uint256) {\n return _balance[account];\n }\n\n function approve(address spender, uint256 amount) external override returns (bool) {\n _setAllowance(msg.sender, spender, amount);\n\n return true;\n }\n\n function increaseApproval(address spender, uint256 amount) external returns (bool) {\n _setAllowance(msg.sender, spender, _allowance[msg.sender][spender].add(amount));\n\n return true;\n }\n\n function decreaseApproval(address spender, uint256 amount) external returns (bool) {\n uint256 currentAllowance = _allowance[msg.sender][spender];\n\n if (amount >= currentAllowance) {\n _setAllowance(msg.sender, spender, 0);\n } else {\n _setAllowance(msg.sender, spender, currentAllowance.sub(amount));\n }\n\n return true;\n }\n\n function transfer(address recipient, uint256 amount) external override returns (bool) {\n _move(msg.sender, recipient, amount);\n\n return true;\n }\n\n function transferFrom(\n address sender,\n address recipient,\n uint256 amount\n ) external override returns (bool) {\n uint256 currentAllowance = _allowance[sender][msg.sender];\n _require(msg.sender == sender || currentAllowance >= amount, Errors.INSUFFICIENT_ALLOWANCE);\n\n _move(sender, recipient, amount);\n\n if (msg.sender != sender && currentAllowance != uint256(-1)) {\n // Because of the previous require, we know that if msg.sender != sender then currentAllowance >= amount\n _setAllowance(sender, msg.sender, currentAllowance - amount);\n }\n\n return true;\n }\n\n function permit(\n address owner,\n address spender,\n uint256 value,\n uint256 deadline,\n uint8 v,\n bytes32 r,\n bytes32 s\n ) public virtual override {\n // solhint-disable-next-line not-rely-on-time\n _require(block.timestamp <= deadline, Errors.EXPIRED_PERMIT);\n\n uint256 nonce = _nonces[owner];\n\n bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPE_HASH, owner, spender, value, nonce, deadline));\n\n bytes32 hash = _hashTypedDataV4(structHash);\n\n address signer = ecrecover(hash, v, r, s);\n _require((signer != address(0)) && (signer == owner), Errors.INVALID_SIGNATURE);\n\n _nonces[owner] = nonce + 1;\n _setAllowance(owner, spender, value);\n }\n\n // Public functions\n\n function name() public view returns (string memory) {\n return _name;\n }\n\n function symbol() public view returns (string memory) {\n return _symbol;\n }\n\n function decimals() public pure returns (uint8) {\n return _DECIMALS;\n }\n\n function totalSupply() public view override returns (uint256) {\n return _totalSupply;\n }\n\n function nonces(address owner) external view override returns (uint256) {\n return _nonces[owner];\n }\n\n // solhint-disable-next-line func-name-mixedcase\n function DOMAIN_SEPARATOR() external view override returns (bytes32) {\n return _domainSeparatorV4();\n }\n\n // Internal functions\n\n function _mintPoolTokens(address recipient, uint256 amount) internal {\n _balance[recipient] = _balance[recipient].add(amount);\n _totalSupply = _totalSupply.add(amount);\n emit Transfer(address(0), recipient, amount);\n }\n\n function _burnPoolTokens(address sender, uint256 amount) internal {\n uint256 currentBalance = _balance[sender];\n _require(currentBalance >= amount, Errors.INSUFFICIENT_BALANCE);\n\n _balance[sender] = currentBalance - amount;\n _totalSupply = _totalSupply.sub(amount);\n emit Transfer(sender, address(0), amount);\n }\n\n function _move(\n address sender,\n address recipient,\n uint256 amount\n ) internal {\n uint256 currentBalance = _balance[sender];\n _require(currentBalance >= amount, Errors.INSUFFICIENT_BALANCE);\n // Prohibit transfers to the zero address to avoid confusion with the\n // Transfer event emitted by `_burnPoolTokens`\n _require(recipient != address(0), Errors.ERC20_TRANSFER_TO_ZERO_ADDRESS);\n\n _balance[sender] = currentBalance - amount;\n _balance[recipient] = _balance[recipient].add(amount);\n\n emit Transfer(sender, recipient, amount);\n }\n\n // Private functions\n\n function _setAllowance(\n address owner,\n address spender,\n uint256 amount\n ) private {\n _allowance[owner][spender] = amount;\n emit Approval(owner, spender, amount);\n }\n}\n" }, "contracts/pools/BasePoolAuthorization.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\nimport \"../lib/helpers/Authentication.sol\";\nimport \"../vault/interfaces/IAuthorizer.sol\";\n\nimport \"./BasePool.sol\";\n\n/**\n * @dev Base authorization layer implementation for Pools.\n *\n * The owner account can call some of the permissioned functions - access control of the rest is delegated to the\n * Authorizer. Note that this owner is immutable: more sophisticated permission schemes, such as multiple ownership,\n * granular roles, etc., could be built on top of this by making the owner a smart contract.\n *\n * Access control of all other permissioned functions is delegated to an Authorizer. It is also possible to delegate\n * control of *all* permissioned functions to the Authorizer by setting the owner address to `_DELEGATE_OWNER`.\n */\nabstract contract BasePoolAuthorization is Authentication {\n address private immutable _owner;\n\n address private constant _DELEGATE_OWNER = 0xBA1BA1ba1BA1bA1bA1Ba1BA1ba1BA1bA1ba1ba1B;\n\n constructor(address owner) {\n _owner = owner;\n }\n\n function getOwner() public view returns (address) {\n return _owner;\n }\n\n function getAuthorizer() external view returns (IAuthorizer) {\n return _getAuthorizer();\n }\n\n function _canPerform(bytes32 actionId, address account) internal view override returns (bool) {\n if ((getOwner() != _DELEGATE_OWNER) && _isOwnerOnlyAction(actionId)) {\n // Only the owner can perform \"owner only\" actions, unless the owner is delegated.\n return msg.sender == getOwner();\n } else {\n // Non-owner actions are always processed via the Authorizer, as \"owner only\" ones are when delegated.\n return _getAuthorizer().canPerform(actionId, account, address(this));\n }\n }\n\n function _isOwnerOnlyAction(bytes32 actionId) private view returns (bool) {\n // This implementation hardcodes the setSwapFeePercentage action identifier.\n return actionId == getActionId(BasePool.setSwapFeePercentage.selector);\n }\n\n function _getAuthorizer() internal view virtual returns (IAuthorizer);\n}\n" }, "contracts/pools/oracle/PoolPriceOracle.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\nimport \"./Buffer.sol\";\nimport \"./Samples.sol\";\nimport \"../../lib/helpers/BalancerErrors.sol\";\n\nimport \"./IWeightedPoolPriceOracle.sol\";\nimport \"../IPriceOracle.sol\";\n\n/**\n * @dev This module allows Pools to access historical pricing information.\n *\n * It uses a 1024 long circular buffer to store past data, where the data within each sample is the result of\n * accumulating live data for no more than two minutes. Therefore, assuming the worst case scenario where new data is\n * updated in every single block, the oldest samples in the buffer (and therefore largest queryable period) will\n * be slightly over 34 hours old.\n *\n * Usage of this module requires the caller to keep track of two variables: the latest circular buffer index, and the\n * timestamp when the index last changed.\n */\ncontract PoolPriceOracle is IWeightedPoolPriceOracle {\n using Buffer for uint256;\n using Samples for bytes32;\n\n // Each sample in the buffer accumulates information for up to 2 minutes. This is simply to reduce the size of the\n // buffer: small time deviations will not have any significant effect.\n // solhint-disable not-rely-on-time\n uint256 private constant _MAX_SAMPLE_DURATION = 2 minutes;\n\n // We use a mapping to simulate an array: the buffer won't grow or shrink, and since we will always use valid\n // indexes using a mapping saves gas by skipping the bounds checks.\n mapping(uint256 => bytes32) internal _samples;\n\n function getSample(uint256 index)\n external\n view\n override\n returns (\n int256 logPairPrice,\n int256 accLogPairPrice,\n int256 logBptPrice,\n int256 accLogBptPrice,\n int256 logInvariant,\n int256 accLogInvariant,\n uint256 timestamp\n )\n {\n _require(index < Buffer.SIZE, Errors.ORACLE_INVALID_INDEX);\n\n bytes32 sample = _getSample(index);\n return sample.unpack();\n }\n\n function getTotalSamples() external pure override returns (uint256) {\n return Buffer.SIZE;\n }\n\n /**\n * @dev Processes new price and invariant data, updating the latest sample or creating a new one.\n *\n * Receives the new logarithms of values to store: `logPairPrice`, `logBptPrice` and `logInvariant`, as well the\n * index of the latest sample and the timestamp of its creation.\n *\n * Returns the index of the latest sample. If different from `latestIndex`, the caller should also store the\n * timestamp, and pass it on future calls to this function.\n */\n function _processPriceData(\n uint256 latestSampleCreationTimestamp,\n uint256 latestIndex,\n int256 logPairPrice,\n int256 logBptPrice,\n int256 logInvariant\n ) internal returns (uint256) {\n // Read latest sample, and compute the next one by updating it with the newly received data.\n bytes32 sample = _getSample(latestIndex).update(logPairPrice, logBptPrice, logInvariant, block.timestamp);\n\n // We create a new sample if more than _MAX_SAMPLE_DURATION seconds have elapsed since the creation of the\n // latest one. In other words, no sample accumulates data over a period larger than _MAX_SAMPLE_DURATION.\n bool newSample = block.timestamp - latestSampleCreationTimestamp >= _MAX_SAMPLE_DURATION;\n latestIndex = newSample ? latestIndex.next() : latestIndex;\n\n // Store the updated or new sample.\n _samples[latestIndex] = sample;\n\n return latestIndex;\n }\n\n /**\n * @dev Returns the instant value for `variable` in the sample pointed to by `index`.\n */\n function _getInstantValue(IPriceOracle.Variable variable, uint256 index) internal view returns (int256) {\n bytes32 sample = _getSample(index);\n _require(sample.timestamp() > 0, Errors.ORACLE_NOT_INITIALIZED);\n\n return sample.instant(variable);\n }\n\n /**\n * @dev Returns the value of the accumulator for `variable` `ago` seconds ago. `latestIndex` must be the index of\n * the latest sample in the buffer.\n *\n * Reverts under the following conditions:\n * - if the buffer is empty.\n * - if querying past information and the buffer has not been fully initialized.\n * - if querying older information than available in the buffer. Note that a full buffer guarantees queries for the\n * past 34 hours will not revert.\n *\n * If requesting information for a timestamp later than the latest one, it is extrapolated using the latest\n * available data.\n *\n * When no exact information is available for the requested past timestamp (as usually happens, since at most one\n * timestamp is stored every two minutes), it is estimated by performing linear interpolation using the closest\n * values. This process is guaranteed to complete performing at most 10 storage reads.\n */\n function _getPastAccumulator(\n IPriceOracle.Variable variable,\n uint256 latestIndex,\n uint256 ago\n ) internal view returns (int256) {\n // `ago` must not be before the epoch.\n _require(block.timestamp >= ago, Errors.ORACLE_INVALID_SECONDS_QUERY);\n uint256 lookUpTime = block.timestamp - ago;\n\n bytes32 latestSample = _getSample(latestIndex);\n uint256 latestTimestamp = latestSample.timestamp();\n\n // The latest sample only has a non-zero timestamp if no data was ever processed and stored in the buffer.\n _require(latestTimestamp > 0, Errors.ORACLE_NOT_INITIALIZED);\n\n if (latestTimestamp <= lookUpTime) {\n // The accumulator at times ahead of the latest one are computed by extrapolating the latest data. This is\n // equivalent to the instant value not changing between the last timestamp and the look up time.\n\n // We can use unchecked arithmetic since the accumulator can be represented in 53 bits, timestamps in 31\n // bits, and the instant value in 22 bits.\n uint256 elapsed = lookUpTime - latestTimestamp;\n return latestSample.accumulator(variable) + (latestSample.instant(variable) * int256(elapsed));\n } else {\n // The look up time is before the latest sample, but we need to make sure that it is not before the oldest\n // sample as well.\n\n // Since we use a circular buffer, the oldest sample is simply the next one.\n uint256 oldestIndex = latestIndex.next();\n {\n // Local scope used to prevent stack-too-deep errors.\n bytes32 oldestSample = _getSample(oldestIndex);\n uint256 oldestTimestamp = oldestSample.timestamp();\n\n // For simplicity's sake, we only perform past queries if the buffer has been fully initialized. This\n // means the oldest sample must have a non-zero timestamp.\n _require(oldestTimestamp > 0, Errors.ORACLE_NOT_INITIALIZED);\n // The only remaining condition to check is for the look up time to be between the oldest and latest\n // timestamps.\n _require(oldestTimestamp <= lookUpTime, Errors.ORACLE_QUERY_TOO_OLD);\n }\n\n // Perform binary search to find nearest samples to the desired timestamp.\n (bytes32 prev, bytes32 next) = _findNearestSample(lookUpTime, oldestIndex);\n\n // `next`'s timestamp is guaranteed to be larger than `prev`'s, so we can skip checked arithmetic.\n uint256 samplesTimeDiff = next.timestamp() - prev.timestamp();\n\n if (samplesTimeDiff > 0) {\n // We estimate the accumulator at the requested look up time by interpolating linearly between the\n // previous and next accumulators.\n\n // We can use unchecked arithmetic since the accumulators can be represented in 53 bits, and timestamps\n // in 31 bits.\n int256 samplesAccDiff = next.accumulator(variable) - prev.accumulator(variable);\n uint256 elapsed = lookUpTime - prev.timestamp();\n return prev.accumulator(variable) + ((samplesAccDiff * int256(elapsed)) / int256(samplesTimeDiff));\n } else {\n // Rarely, one of the samples will have the exact requested look up time, which is indicated by `prev`\n // and `next` being the same. In this case, we simply return the accumulator at that point in time.\n return prev.accumulator(variable);\n }\n }\n }\n\n /**\n * @dev Finds the two samples with timestamps before and after `lookUpDate`. If one of the samples matches exactly,\n * both `prev` and `next` will be it. `offset` is the index of the oldest sample in the buffer.\n *\n * Assumes `lookUpDate` is greater or equal than the timestamp of the oldest sample, and less or equal than the\n * timestamp of the latest sample.\n */\n function _findNearestSample(uint256 lookUpDate, uint256 offset) internal view returns (bytes32 prev, bytes32 next) {\n // We're going to perform a binary search in the circular buffer, which requires it to be sorted. To achieve\n // this, we offset all buffer accesses by `offset`, making the first element the oldest one.\n\n // Auxiliary variables in a typical binary search: we will look at some value `mid` between `low` and `high`,\n // periodically increasing `low` or decreasing `high` until we either find a match or determine the element is\n // not in the array.\n uint256 low = 0;\n uint256 high = Buffer.SIZE - 1;\n uint256 mid;\n\n // If the search fails and no sample has a timestamp of `lookUpDate` (as is the most common scenario), `sample`\n // will be either the sample with the largest timestamp smaller than `lookUpDate`, or the one with the smallest\n // timestamp larger than `lookUpDate`.\n bytes32 sample;\n uint256 sampleTimestamp;\n\n while (low <= high) {\n // Mid is the floor of the average.\n uint256 midWithoutOffset = (high + low) / 2;\n\n // Recall that the buffer is not actually sorted: we need to apply the offset to access it in a sorted way.\n mid = midWithoutOffset.add(offset);\n sample = _getSample(mid);\n sampleTimestamp = sample.timestamp();\n\n if (sampleTimestamp < lookUpDate) {\n // If the mid sample is bellow the look up date, then increase the low index to start from there.\n low = midWithoutOffset + 1;\n } else if (sampleTimestamp > lookUpDate) {\n // If the mid sample is above the look up date, then decrease the high index to start from there.\n\n // We can skip checked arithmetic: it is impossible for `high` to ever be 0, as a scenario where `low`\n // equals 0 and `high` equals 1 would result in `low` increasing to 1 in the previous `if` clause.\n high = midWithoutOffset - 1;\n } else {\n // sampleTimestamp == lookUpDate\n // If we have an exact match, return the sample as both `prev` and `next`.\n return (sample, sample);\n }\n }\n\n // In case we reach here, it means we didn't find exactly the sample we where looking for.\n return sampleTimestamp < lookUpDate ? (sample, _getSample(mid.next())) : (_getSample(mid.prev()), sample);\n }\n\n /**\n * @dev Returns the sample that corresponds to a given `index`.\n *\n * Using this function instead of accessing storage directly results in denser bytecode (since the storage slot is\n * only computed here).\n */\n function _getSample(uint256 index) internal view returns (bytes32) {\n return _samples[index];\n }\n}\n" }, "contracts/pools/oracle/Buffer.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\nlibrary Buffer {\n // The buffer is a circular storage structure with 1024 slots.\n // solhint-disable-next-line private-vars-leading-underscore\n uint256 internal constant SIZE = 1024;\n\n /**\n * @dev Returns the index of the element before the one pointed by `index`.\n */\n function prev(uint256 index) internal pure returns (uint256) {\n return sub(index, 1);\n }\n\n /**\n * @dev Returns the index of the element after the one pointed by `index`.\n */\n function next(uint256 index) internal pure returns (uint256) {\n return add(index, 1);\n }\n\n /**\n * @dev Returns the index of an element `offset` slots after the one pointed by `index`.\n */\n function add(uint256 index, uint256 offset) internal pure returns (uint256) {\n return (index + offset) % SIZE;\n }\n\n /**\n * @dev Returns the index of an element `offset` slots before the one pointed by `index`.\n */\n function sub(uint256 index, uint256 offset) internal pure returns (uint256) {\n return (index + SIZE - offset) % SIZE;\n }\n}\n" }, "contracts/vault/interfaces/IMinimalSwapInfoPool.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"./IBasePool.sol\";\n\n/**\n * @dev Pool contracts with the MinimalSwapInfo or TwoToken specialization settings should implement this interface.\n *\n * This is called by the Vault when a user calls `IVault.swap` or `IVault.batchSwap` to swap with this Pool.\n * Returns the number of tokens the Pool will grant to the user in a 'given in' swap, or that the user will grant\n * to the pool in a 'given out' swap.\n *\n * This can often be implemented by a `view` function, since many pricing algorithms don't need to track state\n * changes in swaps. However, contracts implementing this in non-view functions should check that the caller is\n * indeed the Vault.\n */\ninterface IMinimalSwapInfoPool is IBasePool {\n function onSwap(\n SwapRequest memory swapRequest,\n uint256 currentBalanceTokenIn,\n uint256 currentBalanceTokenOut\n ) external returns (uint256 amount);\n}\n" }, "contracts/pools/IPriceOracle.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\n/**\n * @dev Interface for querying historical data from a Pool that can be used as a Price Oracle.\n *\n * This lets third parties retrieve average prices of tokens held by a Pool over a given period of time, as well as the\n * price of the Pool share token (BPT) and invariant. Since the invariant is a sensible measure of Pool liquidity, it\n * can be used to compare two different price sources, and choose the most liquid one.\n *\n * Once the oracle is fully initialized, all queries are guaranteed to succeed as long as they require no data that\n * is not older than the largest safe query window.\n */\ninterface IPriceOracle {\n // The three values that can be queried:\n //\n // - PAIR_PRICE: the price of the tokens in the Pool, expressed as the price of the second token in units of the\n // first token. For example, if token A is worth $2, and token B is worth $4, the pair price will be 2.0.\n // Note that the price is computed *including* the tokens decimals. This means that the pair price of a Pool with\n // DAI and USDC will be close to 1.0, despite DAI having 18 decimals and USDC 6.\n //\n // - BPT_PRICE: the price of the Pool share token (BPT), in units of the first token.\n // Note that the price is computed *including* the tokens decimals. This means that the BPT price of a Pool with\n // USDC in which BPT is worth $5 will be 5.0, despite the BPT having 18 decimals and USDC 6.\n //\n // - INVARIANT: the value of the Pool's invariant, which serves as a measure of its liquidity.\n enum Variable { PAIR_PRICE, BPT_PRICE, INVARIANT }\n\n /**\n * @dev Returns the time average weighted price corresponding to each of `queries`. Prices are represented as 18\n * decimal fixed point values.\n */\n function getTimeWeightedAverage(OracleAverageQuery[] memory queries)\n external\n view\n returns (uint256[] memory results);\n\n /**\n * @dev Returns latest sample of `variable`. Prices are represented as 18 decimal fixed point values.\n */\n function getLatest(Variable variable) external view returns (uint256);\n\n /**\n * @dev Information for a Time Weighted Average query.\n *\n * Each query computes the average over a window of duration `secs` seconds that ended `ago` seconds ago. For\n * example, the average over the past 30 minutes is computed by settings secs to 1800 and ago to 0. If secs is 1800\n * and ago is 1800 as well, the average between 60 and 30 minutes ago is computed instead.\n */\n struct OracleAverageQuery {\n Variable variable;\n uint256 secs;\n uint256 ago;\n }\n\n /**\n * @dev Returns largest time window that can be safely queried, where 'safely' means the Oracle is guaranteed to be\n * able to produce a result and not revert.\n *\n * If a query has a non-zero `ago` value, then `secs + ago` (the oldest point in time) must be smaller than this\n * value for 'safe' queries.\n */\n function getLargestSafeQueryWindow() external view returns (uint256);\n\n /**\n * @dev Returns the accumulators corresponding to each of `queries`.\n */\n function getPastAccumulators(OracleAccumulatorQuery[] memory queries)\n external\n view\n returns (int256[] memory results);\n\n /**\n * @dev Information for an Accumulator query.\n *\n * Each query estimates the accumulator at a time `ago` seconds ago.\n */\n struct OracleAccumulatorQuery {\n Variable variable;\n uint256 ago;\n }\n}\n" }, "contracts/lib/math/LogExpMath.sol": { "content": "// SPDX-License-Identifier: MIT\n// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated\n// documentation files (the “Software”), to deal in the Software without restriction, including without limitation the\n// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to\n// permit persons to whom the Software is furnished to do so, subject to the following conditions:\n\n// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the\n// Software.\n\n// THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE\n// WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR\n// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n\npragma solidity ^0.7.0;\n\nimport \"../helpers/BalancerErrors.sol\";\n\n/* solhint-disable */\n\n/**\n * @dev Exponentiation and logarithm functions for 18 decimal fixed point numbers (both base and exponent/argument).\n *\n * Exponentiation and logarithm with arbitrary bases (x^y and log_x(y)) are implemented by conversion to natural\n * exponentiation and logarithm (where the base is Euler's number).\n *\n * @author Fernando Martinelli - @fernandomartinelli\n * @author Sergio Yuhjtman - @sergioyuhjtman\n * @author Daniel Fernandez - @dmf7z\n */\nlibrary LogExpMath {\n // All fixed point multiplications and divisions are inlined. This means we need to divide by ONE when multiplying\n // two numbers, and multiply by ONE when dividing them.\n\n // All arguments and return values are 18 decimal fixed point numbers.\n int256 constant ONE_18 = 1e18;\n\n // Internally, intermediate values are computed with higher precision as 20 decimal fixed point numbers, and in the\n // case of ln36, 36 decimals.\n int256 constant ONE_20 = 1e20;\n int256 constant ONE_36 = 1e36;\n\n // The domain of natural exponentiation is bound by the word size and number of decimals used.\n //\n // Because internally the result will be stored using 20 decimals, the largest possible result is\n // (2^255 - 1) / 10^20, which makes the largest exponent ln((2^255 - 1) / 10^20) = 130.700829182905140221.\n // The smallest possible result is 10^(-18), which makes largest negative argument\n // ln(10^(-18)) = -41.446531673892822312.\n // We use 130.0 and -41.0 to have some safety margin.\n int256 constant MAX_NATURAL_EXPONENT = 130e18;\n int256 constant MIN_NATURAL_EXPONENT = -41e18;\n\n // Bounds for ln_36's argument. Both ln(0.9) and ln(1.1) can be represented with 36 decimal places in a fixed point\n // 256 bit integer.\n int256 constant LN_36_LOWER_BOUND = ONE_18 - 1e17;\n int256 constant LN_36_UPPER_BOUND = ONE_18 + 1e17;\n\n uint256 constant MILD_EXPONENT_BOUND = 2**254 / uint256(ONE_20);\n\n // 18 decimal constants\n int256 constant x0 = 128000000000000000000; // 2ˆ7\n int256 constant a0 = 38877084059945950922200000000000000000000000000000000000; // eˆ(x0) (no decimals)\n int256 constant x1 = 64000000000000000000; // 2ˆ6\n int256 constant a1 = 6235149080811616882910000000; // eˆ(x1) (no decimals)\n\n // 20 decimal constants\n int256 constant x2 = 3200000000000000000000; // 2ˆ5\n int256 constant a2 = 7896296018268069516100000000000000; // eˆ(x2)\n int256 constant x3 = 1600000000000000000000; // 2ˆ4\n int256 constant a3 = 888611052050787263676000000; // eˆ(x3)\n int256 constant x4 = 800000000000000000000; // 2ˆ3\n int256 constant a4 = 298095798704172827474000; // eˆ(x4)\n int256 constant x5 = 400000000000000000000; // 2ˆ2\n int256 constant a5 = 5459815003314423907810; // eˆ(x5)\n int256 constant x6 = 200000000000000000000; // 2ˆ1\n int256 constant a6 = 738905609893065022723; // eˆ(x6)\n int256 constant x7 = 100000000000000000000; // 2ˆ0\n int256 constant a7 = 271828182845904523536; // eˆ(x7)\n int256 constant x8 = 50000000000000000000; // 2ˆ-1\n int256 constant a8 = 164872127070012814685; // eˆ(x8)\n int256 constant x9 = 25000000000000000000; // 2ˆ-2\n int256 constant a9 = 128402541668774148407; // eˆ(x9)\n int256 constant x10 = 12500000000000000000; // 2ˆ-3\n int256 constant a10 = 113314845306682631683; // eˆ(x10)\n int256 constant x11 = 6250000000000000000; // 2ˆ-4\n int256 constant a11 = 106449445891785942956; // eˆ(x11)\n\n /**\n * @dev Exponentiation (x^y) with unsigned 18 decimal fixed point base and exponent.\n *\n * Reverts if ln(x) * y is smaller than `MIN_NATURAL_EXPONENT`, or larger than `MAX_NATURAL_EXPONENT`.\n */\n function pow(uint256 x, uint256 y) internal pure returns (uint256) {\n if (y == 0) {\n // We solve the 0^0 indetermination by making it equal one.\n return uint256(ONE_18);\n }\n\n if (x == 0) {\n return 0;\n }\n\n // Instead of computing x^y directly, we instead rely on the properties of logarithms and exponentiation to\n // arrive at that result. In particular, exp(ln(x)) = x, and ln(x^y) = y * ln(x). This means\n // x^y = exp(y * ln(x)).\n\n // The ln function takes a signed value, so we need to make sure x fits in the signed 256 bit range.\n _require(x < 2**255, Errors.X_OUT_OF_BOUNDS);\n int256 x_int256 = int256(x);\n\n // We will compute y * ln(x) in a single step. Depending on the value of x, we can either use ln or ln_36. In\n // both cases, we leave the division by ONE_18 (due to fixed point multiplication) to the end.\n\n // This prevents y * ln(x) from overflowing, and at the same time guarantees y fits in the signed 256 bit range.\n _require(y < MILD_EXPONENT_BOUND, Errors.Y_OUT_OF_BOUNDS);\n int256 y_int256 = int256(y);\n\n int256 logx_times_y;\n if (LN_36_LOWER_BOUND < x_int256 && x_int256 < LN_36_UPPER_BOUND) {\n int256 ln_36_x = _ln_36(x_int256);\n\n // ln_36_x has 36 decimal places, so multiplying by y_int256 isn't as straightforward, since we can't just\n // bring y_int256 to 36 decimal places, as it might overflow. Instead, we perform two 18 decimal\n // multiplications and add the results: one with the first 18 decimals of ln_36_x, and one with the\n // (downscaled) last 18 decimals.\n logx_times_y = ((ln_36_x / ONE_18) * y_int256 + ((ln_36_x % ONE_18) * y_int256) / ONE_18);\n } else {\n logx_times_y = _ln(x_int256) * y_int256;\n }\n logx_times_y /= ONE_18;\n\n // Finally, we compute exp(y * ln(x)) to arrive at x^y\n _require(\n MIN_NATURAL_EXPONENT <= logx_times_y && logx_times_y <= MAX_NATURAL_EXPONENT,\n Errors.PRODUCT_OUT_OF_BOUNDS\n );\n\n return uint256(exp(logx_times_y));\n }\n\n /**\n * @dev Natural exponentiation (e^x) with signed 18 decimal fixed point exponent.\n *\n * Reverts if `x` is smaller than MIN_NATURAL_EXPONENT, or larger than `MAX_NATURAL_EXPONENT`.\n */\n function exp(int256 x) internal pure returns (int256) {\n _require(x >= MIN_NATURAL_EXPONENT && x <= MAX_NATURAL_EXPONENT, Errors.INVALID_EXPONENT);\n\n if (x < 0) {\n // We only handle positive exponents: e^(-x) is computed as 1 / e^x. We can safely make x positive since it\n // fits in the signed 256 bit range (as it is larger than MIN_NATURAL_EXPONENT).\n // Fixed point division requires multiplying by ONE_18.\n return ((ONE_18 * ONE_18) / exp(-x));\n }\n\n // First, we use the fact that e^(x+y) = e^x * e^y to decompose x into a sum of powers of two, which we call x_n,\n // where x_n == 2^(7 - n), and e^x_n = a_n has been precomputed. We choose the first x_n, x0, to equal 2^7\n // because all larger powers are larger than MAX_NATURAL_EXPONENT, and therefore not present in the\n // decomposition.\n // At the end of this process we will have the product of all e^x_n = a_n that apply, and the remainder of this\n // decomposition, which will be lower than the smallest x_n.\n // exp(x) = k_0 * a_0 * k_1 * a_1 * ... + k_n * a_n * exp(remainder), where each k_n equals either 0 or 1.\n // We mutate x by subtracting x_n, making it the remainder of the decomposition.\n\n // The first two a_n (e^(2^7) and e^(2^6)) are too large if stored as 18 decimal numbers, and could cause\n // intermediate overflows. Instead we store them as plain integers, with 0 decimals.\n // Additionally, x0 + x1 is larger than MAX_NATURAL_EXPONENT, which means they will not both be present in the\n // decomposition.\n\n // For each x_n, we test if that term is present in the decomposition (if x is larger than it), and if so deduct\n // it and compute the accumulated product.\n\n int256 firstAN;\n if (x >= x0) {\n x -= x0;\n firstAN = a0;\n } else if (x >= x1) {\n x -= x1;\n firstAN = a1;\n } else {\n firstAN = 1; // One with no decimal places\n }\n\n // We now transform x into a 20 decimal fixed point number, to have enhanced precision when computing the\n // smaller terms.\n x *= 100;\n\n // `product` is the accumulated product of all a_n (except a0 and a1), which starts at 20 decimal fixed point\n // one. Recall that fixed point multiplication requires dividing by ONE_20.\n int256 product = ONE_20;\n\n if (x >= x2) {\n x -= x2;\n product = (product * a2) / ONE_20;\n }\n if (x >= x3) {\n x -= x3;\n product = (product * a3) / ONE_20;\n }\n if (x >= x4) {\n x -= x4;\n product = (product * a4) / ONE_20;\n }\n if (x >= x5) {\n x -= x5;\n product = (product * a5) / ONE_20;\n }\n if (x >= x6) {\n x -= x6;\n product = (product * a6) / ONE_20;\n }\n if (x >= x7) {\n x -= x7;\n product = (product * a7) / ONE_20;\n }\n if (x >= x8) {\n x -= x8;\n product = (product * a8) / ONE_20;\n }\n if (x >= x9) {\n x -= x9;\n product = (product * a9) / ONE_20;\n }\n\n // x10 and x11 are unnecessary here since we have high enough precision already.\n\n // Now we need to compute e^x, where x is small (in particular, it is smaller than x9). We use the Taylor series\n // expansion for e^x: 1 + x + (x^2 / 2!) + (x^3 / 3!) + ... + (x^n / n!).\n\n int256 seriesSum = ONE_20; // The initial one in the sum, with 20 decimal places.\n int256 term; // Each term in the sum, where the nth term is (x^n / n!).\n\n // The first term is simply x.\n term = x;\n seriesSum += term;\n\n // Each term (x^n / n!) equals the previous one times x, divided by n. Since x is a fixed point number,\n // multiplying by it requires dividing by ONE_20, but dividing by the non-fixed point n values does not.\n\n term = ((term * x) / ONE_20) / 2;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 3;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 4;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 5;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 6;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 7;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 8;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 9;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 10;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 11;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 12;\n seriesSum += term;\n\n // 12 Taylor terms are sufficient for 18 decimal precision.\n\n // We now have the first a_n (with no decimals), and the product of all other a_n present, and the Taylor\n // approximation of the exponentiation of the remainder (both with 20 decimals). All that remains is to multiply\n // all three (one 20 decimal fixed point multiplication, dividing by ONE_20, and one integer multiplication),\n // and then drop two digits to return an 18 decimal value.\n\n return (((product * seriesSum) / ONE_20) * firstAN) / 100;\n }\n\n /**\n * @dev Logarithm (log(arg, base), with signed 18 decimal fixed point base and argument.\n */\n function log(int256 arg, int256 base) internal pure returns (int256) {\n // This performs a simple base change: log(arg, base) = ln(arg) / ln(base).\n\n // Both logBase and logArg are computed as 36 decimal fixed point numbers, either by using ln_36, or by\n // upscaling.\n\n int256 logBase;\n if (LN_36_LOWER_BOUND < base && base < LN_36_UPPER_BOUND) {\n logBase = _ln_36(base);\n } else {\n logBase = _ln(base) * ONE_18;\n }\n\n int256 logArg;\n if (LN_36_LOWER_BOUND < arg && arg < LN_36_UPPER_BOUND) {\n logArg = _ln_36(arg);\n } else {\n logArg = _ln(arg) * ONE_18;\n }\n\n // When dividing, we multiply by ONE_18 to arrive at a result with 18 decimal places\n return (logArg * ONE_18) / logBase;\n }\n\n /**\n * @dev Natural logarithm (ln(a)) with signed 18 decimal fixed point argument.\n */\n function ln(int256 a) internal pure returns (int256) {\n // The real natural logarithm is not defined for negative numbers or zero.\n _require(a > 0, Errors.OUT_OF_BOUNDS);\n if (LN_36_LOWER_BOUND < a && a < LN_36_UPPER_BOUND) {\n return _ln_36(a) / ONE_18;\n } else {\n return _ln(a);\n }\n }\n\n /**\n * @dev Internal natural logarithm (ln(a)) with signed 18 decimal fixed point argument.\n */\n function _ln(int256 a) private pure returns (int256) {\n if (a < ONE_18) {\n // Since ln(a^k) = k * ln(a), we can compute ln(a) as ln(a) = ln((1/a)^(-1)) = - ln((1/a)). If a is less\n // than one, 1/a will be greater than one, and this if statement will not be entered in the recursive call.\n // Fixed point division requires multiplying by ONE_18.\n return (-_ln((ONE_18 * ONE_18) / a));\n }\n\n // First, we use the fact that ln^(a * b) = ln(a) + ln(b) to decompose ln(a) into a sum of powers of two, which\n // we call x_n, where x_n == 2^(7 - n), which are the natural logarithm of precomputed quantities a_n (that is,\n // ln(a_n) = x_n). We choose the first x_n, x0, to equal 2^7 because the exponential of all larger powers cannot\n // be represented as 18 fixed point decimal numbers in 256 bits, and are therefore larger than a.\n // At the end of this process we will have the sum of all x_n = ln(a_n) that apply, and the remainder of this\n // decomposition, which will be lower than the smallest a_n.\n // ln(a) = k_0 * x_0 + k_1 * x_1 + ... + k_n * x_n + ln(remainder), where each k_n equals either 0 or 1.\n // We mutate a by subtracting a_n, making it the remainder of the decomposition.\n\n // For reasons related to how `exp` works, the first two a_n (e^(2^7) and e^(2^6)) are not stored as fixed point\n // numbers with 18 decimals, but instead as plain integers with 0 decimals, so we need to multiply them by\n // ONE_18 to convert them to fixed point.\n // For each a_n, we test if that term is present in the decomposition (if a is larger than it), and if so divide\n // by it and compute the accumulated sum.\n\n int256 sum = 0;\n if (a >= a0 * ONE_18) {\n a /= a0; // Integer, not fixed point division\n sum += x0;\n }\n\n if (a >= a1 * ONE_18) {\n a /= a1; // Integer, not fixed point division\n sum += x1;\n }\n\n // All other a_n and x_n are stored as 20 digit fixed point numbers, so we convert the sum and a to this format.\n sum *= 100;\n a *= 100;\n\n // Because further a_n are 20 digit fixed point numbers, we multiply by ONE_20 when dividing by them.\n\n if (a >= a2) {\n a = (a * ONE_20) / a2;\n sum += x2;\n }\n\n if (a >= a3) {\n a = (a * ONE_20) / a3;\n sum += x3;\n }\n\n if (a >= a4) {\n a = (a * ONE_20) / a4;\n sum += x4;\n }\n\n if (a >= a5) {\n a = (a * ONE_20) / a5;\n sum += x5;\n }\n\n if (a >= a6) {\n a = (a * ONE_20) / a6;\n sum += x6;\n }\n\n if (a >= a7) {\n a = (a * ONE_20) / a7;\n sum += x7;\n }\n\n if (a >= a8) {\n a = (a * ONE_20) / a8;\n sum += x8;\n }\n\n if (a >= a9) {\n a = (a * ONE_20) / a9;\n sum += x9;\n }\n\n if (a >= a10) {\n a = (a * ONE_20) / a10;\n sum += x10;\n }\n\n if (a >= a11) {\n a = (a * ONE_20) / a11;\n sum += x11;\n }\n\n // a is now a small number (smaller than a_11, which roughly equals 1.06). This means we can use a Taylor series\n // that converges rapidly for values of `a` close to one - the same one used in ln_36.\n // Let z = (a - 1) / (a + 1).\n // ln(a) = 2 * (z + z^3 / 3 + z^5 / 5 + z^7 / 7 + ... + z^(2 * n + 1) / (2 * n + 1))\n\n // Recall that 20 digit fixed point division requires multiplying by ONE_20, and multiplication requires\n // division by ONE_20.\n int256 z = ((a - ONE_20) * ONE_20) / (a + ONE_20);\n int256 z_squared = (z * z) / ONE_20;\n\n // num is the numerator of the series: the z^(2 * n + 1) term\n int256 num = z;\n\n // seriesSum holds the accumulated sum of each term in the series, starting with the initial z\n int256 seriesSum = num;\n\n // In each step, the numerator is multiplied by z^2\n num = (num * z_squared) / ONE_20;\n seriesSum += num / 3;\n\n num = (num * z_squared) / ONE_20;\n seriesSum += num / 5;\n\n num = (num * z_squared) / ONE_20;\n seriesSum += num / 7;\n\n num = (num * z_squared) / ONE_20;\n seriesSum += num / 9;\n\n num = (num * z_squared) / ONE_20;\n seriesSum += num / 11;\n\n // 6 Taylor terms are sufficient for 36 decimal precision.\n\n // Finally, we multiply by 2 (non fixed point) to compute ln(remainder)\n seriesSum *= 2;\n\n // We now have the sum of all x_n present, and the Taylor approximation of the logarithm of the remainder (both\n // with 20 decimals). All that remains is to sum these two, and then drop two digits to return a 18 decimal\n // value.\n\n return (sum + seriesSum) / 100;\n }\n\n /**\n * @dev Intrnal high precision (36 decimal places) natural logarithm (ln(x)) with signed 18 decimal fixed point argument,\n * for x close to one.\n *\n * Should only be used if x is between LN_36_LOWER_BOUND and LN_36_UPPER_BOUND.\n */\n function _ln_36(int256 x) private pure returns (int256) {\n // Since ln(1) = 0, a value of x close to one will yield a very small result, which makes using 36 digits\n // worthwhile.\n\n // First, we transform x to a 36 digit fixed point value.\n x *= ONE_18;\n\n // We will use the following Taylor expansion, which converges very rapidly. Let z = (x - 1) / (x + 1).\n // ln(x) = 2 * (z + z^3 / 3 + z^5 / 5 + z^7 / 7 + ... + z^(2 * n + 1) / (2 * n + 1))\n\n // Recall that 36 digit fixed point division requires multiplying by ONE_36, and multiplication requires\n // division by ONE_36.\n int256 z = ((x - ONE_36) * ONE_36) / (x + ONE_36);\n int256 z_squared = (z * z) / ONE_36;\n\n // num is the numerator of the series: the z^(2 * n + 1) term\n int256 num = z;\n\n // seriesSum holds the accumulated sum of each term in the series, starting with the initial z\n int256 seriesSum = num;\n\n // In each step, the numerator is multiplied by z^2\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 3;\n\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 5;\n\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 7;\n\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 9;\n\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 11;\n\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 13;\n\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 15;\n\n // 8 Taylor terms are sufficient for 36 decimal precision.\n\n // All that remains is multiplying by 2 (non fixed point).\n return seriesSum * 2;\n }\n}\n" }, "contracts/lib/helpers/BalancerErrors.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\n// solhint-disable\n\n/**\n * @dev Reverts if `condition` is false, with a revert reason containing `errorCode`. Only codes up to 999 are\n * supported.\n */\nfunction _require(bool condition, uint256 errorCode) pure {\n if (!condition) _revert(errorCode);\n}\n\n/**\n * @dev Reverts with a revert reason containing `errorCode`. Only codes up to 999 are supported.\n */\nfunction _revert(uint256 errorCode) pure {\n // We're going to dynamically create a revert string based on the error code, with the following format:\n // 'BAL#{errorCode}'\n // where the code is left-padded with zeroes to three digits (so they range from 000 to 999).\n //\n // We don't have revert strings embedded in the contract to save bytecode size: it takes much less space to store a\n // number (8 to 16 bits) than the individual string characters.\n //\n // The dynamic string creation algorithm that follows could be implemented in Solidity, but assembly allows for a\n // much denser implementation, again saving bytecode size. Given this function unconditionally reverts, this is a\n // safe place to rely on it without worrying about how its usage might affect e.g. memory contents.\n assembly {\n // First, we need to compute the ASCII representation of the error code. We assume that it is in the 0-999\n // range, so we only need to convert three digits. To convert the digits to ASCII, we add 0x30, the value for\n // the '0' character.\n\n let units := add(mod(errorCode, 10), 0x30)\n\n errorCode := div(errorCode, 10)\n let tenths := add(mod(errorCode, 10), 0x30)\n\n errorCode := div(errorCode, 10)\n let hundreds := add(mod(errorCode, 10), 0x30)\n\n // With the individual characters, we can now construct the full string. The \"BAL#\" part is a known constant\n // (0x42414c23): we simply shift this by 24 (to provide space for the 3 bytes of the error code), and add the\n // characters to it, each shifted by a multiple of 8.\n // The revert reason is then shifted left by 200 bits (256 minus the length of the string, 7 characters * 8 bits\n // per character = 56) to locate it in the most significant part of the 256 slot (the beginning of a byte\n // array).\n\n let revertReason := shl(200, add(0x42414c23000000, add(add(units, shl(8, tenths)), shl(16, hundreds))))\n\n // We can now encode the reason in memory, which can be safely overwritten as we're about to revert. The encoded\n // message will have the following layout:\n // [ revert reason identifier ] [ string location offset ] [ string length ] [ string contents ]\n\n // The Solidity revert reason identifier is 0x08c739a0, the function selector of the Error(string) function. We\n // also write zeroes to the next 28 bytes of memory, but those are about to be overwritten.\n mstore(0x0, 0x08c379a000000000000000000000000000000000000000000000000000000000)\n // Next is the offset to the location of the string, which will be placed immediately after (20 bytes away).\n mstore(0x04, 0x0000000000000000000000000000000000000000000000000000000000000020)\n // The string length is fixed: 7 characters.\n mstore(0x24, 7)\n // Finally, the string itself is stored.\n mstore(0x44, revertReason)\n\n // Even if the string is only 7 bytes long, we need to return a full 32 byte slot containing it. The length of\n // the encoded message is therefore 4 + 32 + 32 + 32 = 100.\n revert(0, 100)\n }\n}\n\nlibrary Errors {\n // Math\n uint256 internal constant ADD_OVERFLOW = 0;\n uint256 internal constant SUB_OVERFLOW = 1;\n uint256 internal constant SUB_UNDERFLOW = 2;\n uint256 internal constant MUL_OVERFLOW = 3;\n uint256 internal constant ZERO_DIVISION = 4;\n uint256 internal constant DIV_INTERNAL = 5;\n uint256 internal constant X_OUT_OF_BOUNDS = 6;\n uint256 internal constant Y_OUT_OF_BOUNDS = 7;\n uint256 internal constant PRODUCT_OUT_OF_BOUNDS = 8;\n uint256 internal constant INVALID_EXPONENT = 9;\n\n // Input\n uint256 internal constant OUT_OF_BOUNDS = 100;\n uint256 internal constant UNSORTED_ARRAY = 101;\n uint256 internal constant UNSORTED_TOKENS = 102;\n uint256 internal constant INPUT_LENGTH_MISMATCH = 103;\n uint256 internal constant ZERO_TOKEN = 104;\n\n // Shared pools\n uint256 internal constant MIN_TOKENS = 200;\n uint256 internal constant MAX_TOKENS = 201;\n uint256 internal constant MAX_SWAP_FEE_PERCENTAGE = 202;\n uint256 internal constant MIN_SWAP_FEE_PERCENTAGE = 203;\n uint256 internal constant MINIMUM_BPT = 204;\n uint256 internal constant CALLER_NOT_VAULT = 205;\n uint256 internal constant UNINITIALIZED = 206;\n uint256 internal constant BPT_IN_MAX_AMOUNT = 207;\n uint256 internal constant BPT_OUT_MIN_AMOUNT = 208;\n uint256 internal constant EXPIRED_PERMIT = 209;\n\n // Pools\n uint256 internal constant MIN_AMP = 300;\n uint256 internal constant MAX_AMP = 301;\n uint256 internal constant MIN_WEIGHT = 302;\n uint256 internal constant MAX_STABLE_TOKENS = 303;\n uint256 internal constant MAX_IN_RATIO = 304;\n uint256 internal constant MAX_OUT_RATIO = 305;\n uint256 internal constant MIN_BPT_IN_FOR_TOKEN_OUT = 306;\n uint256 internal constant MAX_OUT_BPT_FOR_TOKEN_IN = 307;\n uint256 internal constant NORMALIZED_WEIGHT_INVARIANT = 308;\n uint256 internal constant INVALID_TOKEN = 309;\n uint256 internal constant UNHANDLED_JOIN_KIND = 310;\n uint256 internal constant ZERO_INVARIANT = 311;\n uint256 internal constant ORACLE_INVALID_SECONDS_QUERY = 312;\n uint256 internal constant ORACLE_NOT_INITIALIZED = 313;\n uint256 internal constant ORACLE_QUERY_TOO_OLD = 314;\n uint256 internal constant ORACLE_INVALID_INDEX = 315;\n uint256 internal constant ORACLE_BAD_SECS = 316;\n\n // Lib\n uint256 internal constant REENTRANCY = 400;\n uint256 internal constant SENDER_NOT_ALLOWED = 401;\n uint256 internal constant PAUSED = 402;\n uint256 internal constant PAUSE_WINDOW_EXPIRED = 403;\n uint256 internal constant MAX_PAUSE_WINDOW_DURATION = 404;\n uint256 internal constant MAX_BUFFER_PERIOD_DURATION = 405;\n uint256 internal constant INSUFFICIENT_BALANCE = 406;\n uint256 internal constant INSUFFICIENT_ALLOWANCE = 407;\n uint256 internal constant ERC20_TRANSFER_FROM_ZERO_ADDRESS = 408;\n uint256 internal constant ERC20_TRANSFER_TO_ZERO_ADDRESS = 409;\n uint256 internal constant ERC20_MINT_TO_ZERO_ADDRESS = 410;\n uint256 internal constant ERC20_BURN_FROM_ZERO_ADDRESS = 411;\n uint256 internal constant ERC20_APPROVE_FROM_ZERO_ADDRESS = 412;\n uint256 internal constant ERC20_APPROVE_TO_ZERO_ADDRESS = 413;\n uint256 internal constant ERC20_TRANSFER_EXCEEDS_ALLOWANCE = 414;\n uint256 internal constant ERC20_DECREASED_ALLOWANCE_BELOW_ZERO = 415;\n uint256 internal constant ERC20_TRANSFER_EXCEEDS_BALANCE = 416;\n uint256 internal constant ERC20_BURN_EXCEEDS_ALLOWANCE = 417;\n uint256 internal constant SAFE_ERC20_CALL_FAILED = 418;\n uint256 internal constant ADDRESS_INSUFFICIENT_BALANCE = 419;\n uint256 internal constant ADDRESS_CANNOT_SEND_VALUE = 420;\n uint256 internal constant SAFE_CAST_VALUE_CANT_FIT_INT256 = 421;\n uint256 internal constant GRANT_SENDER_NOT_ADMIN = 422;\n uint256 internal constant REVOKE_SENDER_NOT_ADMIN = 423;\n uint256 internal constant RENOUNCE_SENDER_NOT_ALLOWED = 424;\n uint256 internal constant BUFFER_PERIOD_EXPIRED = 425;\n\n // Vault\n uint256 internal constant INVALID_POOL_ID = 500;\n uint256 internal constant CALLER_NOT_POOL = 501;\n uint256 internal constant SENDER_NOT_ASSET_MANAGER = 502;\n uint256 internal constant USER_DOESNT_ALLOW_RELAYER = 503;\n uint256 internal constant INVALID_SIGNATURE = 504;\n uint256 internal constant EXIT_BELOW_MIN = 505;\n uint256 internal constant JOIN_ABOVE_MAX = 506;\n uint256 internal constant SWAP_LIMIT = 507;\n uint256 internal constant SWAP_DEADLINE = 508;\n uint256 internal constant CANNOT_SWAP_SAME_TOKEN = 509;\n uint256 internal constant UNKNOWN_AMOUNT_IN_FIRST_SWAP = 510;\n uint256 internal constant MALCONSTRUCTED_MULTIHOP_SWAP = 511;\n uint256 internal constant INTERNAL_BALANCE_OVERFLOW = 512;\n uint256 internal constant INSUFFICIENT_INTERNAL_BALANCE = 513;\n uint256 internal constant INVALID_ETH_INTERNAL_BALANCE = 514;\n uint256 internal constant INVALID_POST_LOAN_BALANCE = 515;\n uint256 internal constant INSUFFICIENT_ETH = 516;\n uint256 internal constant UNALLOCATED_ETH = 517;\n uint256 internal constant ETH_TRANSFER = 518;\n uint256 internal constant CANNOT_USE_ETH_SENTINEL = 519;\n uint256 internal constant TOKENS_MISMATCH = 520;\n uint256 internal constant TOKEN_NOT_REGISTERED = 521;\n uint256 internal constant TOKEN_ALREADY_REGISTERED = 522;\n uint256 internal constant TOKENS_ALREADY_SET = 523;\n uint256 internal constant TOKENS_LENGTH_MUST_BE_2 = 524;\n uint256 internal constant NONZERO_TOKEN_BALANCE = 525;\n uint256 internal constant BALANCE_TOTAL_OVERFLOW = 526;\n uint256 internal constant POOL_NO_TOKENS = 527;\n uint256 internal constant INSUFFICIENT_FLASH_LOAN_BALANCE = 528;\n\n // Fees\n uint256 internal constant SWAP_FEE_PERCENTAGE_TOO_HIGH = 600;\n uint256 internal constant FLASH_LOAN_FEE_PERCENTAGE_TOO_HIGH = 601;\n uint256 internal constant INSUFFICIENT_FLASH_LOAN_FEE_AMOUNT = 602;\n}\n" }, "contracts/lib/openzeppelin/IERC20.sol": { "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n /**\n * @dev Returns the amount of tokens in existence.\n */\n function totalSupply() external view returns (uint256);\n\n /**\n * @dev Returns the amount of tokens owned by `account`.\n */\n function balanceOf(address account) external view returns (uint256);\n\n /**\n * @dev Moves `amount` tokens from the caller's account to `recipient`.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * Emits a {Transfer} event.\n */\n function transfer(address recipient, uint256 amount) external returns (bool);\n\n /**\n * @dev Returns the remaining number of tokens that `spender` will be\n * allowed to spend on behalf of `owner` through {transferFrom}. This is\n * zero by default.\n *\n * This value changes when {approve} or {transferFrom} are called.\n */\n function allowance(address owner, address spender) external view returns (uint256);\n\n /**\n * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * IMPORTANT: Beware that changing an allowance with this method brings the risk\n * that someone may use both the old and the new allowance by unfortunate\n * transaction ordering. One possible solution to mitigate this race\n * condition is to first reduce the spender's allowance to 0 and set the\n * desired value afterwards:\n * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n *\n * Emits an {Approval} event.\n */\n function approve(address spender, uint256 amount) external returns (bool);\n\n /**\n * @dev Moves `amount` tokens from `sender` to `recipient` using the\n * allowance mechanism. `amount` is then deducted from the caller's\n * allowance.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * Emits a {Transfer} event.\n */\n function transferFrom(\n address sender,\n address recipient,\n uint256 amount\n ) external returns (bool);\n\n /**\n * @dev Emitted when `value` tokens are moved from one account (`from`) to\n * another (`to`).\n *\n * Note that `value` may be zero.\n */\n event Transfer(address indexed from, address indexed to, uint256 value);\n\n /**\n * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n * a call to {approve}. `value` is the new allowance.\n */\n event Approval(address indexed owner, address indexed spender, uint256 value);\n}\n" }, "contracts/vault/interfaces/IAsset.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\n/**\n * @dev This is an empty interface used to represent either ERC20-conforming token contracts or ETH (using the zero\n * address sentinel value). We're just relying on the fact that `interface` can be used to declare new address-like\n * types.\n *\n * This concept is unrelated to a Pool's Asset Managers.\n */\ninterface IAsset {\n // solhint-disable-previous-line no-empty-blocks\n}\n" }, "contracts/lib/helpers/ITemporarilyPausable.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Interface for the TemporarilyPausable helper.\n */\ninterface ITemporarilyPausable {\n /**\n * @dev Emitted every time the pause state changes by `_setPaused`.\n */\n event PausedStateChanged(bool paused);\n\n /**\n * @dev Returns the current paused state.\n */\n function getPausedState()\n external\n view\n returns (\n bool paused,\n uint256 pauseWindowEndTime,\n uint256 bufferPeriodEndTime\n );\n}\n" }, "contracts/lib/openzeppelin/SafeMath.sol": { "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"../helpers/BalancerErrors.sol\";\n\n/**\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\n * checks.\n *\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\n * in bugs, because programmers usually assume that an overflow raises an\n * error, which is the standard behavior in high level programming languages.\n * `SafeMath` restores this intuition by reverting the transaction when an\n * operation overflows.\n *\n * Using this library instead of the unchecked operations eliminates an entire\n * class of bugs, so it's recommended to use it always.\n */\nlibrary SafeMath {\n /**\n * @dev Returns the addition of two unsigned integers, reverting on\n * overflow.\n *\n * Counterpart to Solidity's `+` operator.\n *\n * Requirements:\n *\n * - Addition cannot overflow.\n */\n function add(uint256 a, uint256 b) internal pure returns (uint256) {\n uint256 c = a + b;\n _require(c >= a, Errors.ADD_OVERFLOW);\n\n return c;\n }\n\n /**\n * @dev Returns the subtraction of two unsigned integers, reverting on\n * overflow (when the result is negative).\n *\n * Counterpart to Solidity's `-` operator.\n *\n * Requirements:\n *\n * - Subtraction cannot overflow.\n */\n function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n return sub(a, b, Errors.SUB_OVERFLOW);\n }\n\n /**\n * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\n * overflow (when the result is negative).\n *\n * Counterpart to Solidity's `-` operator.\n *\n * Requirements:\n *\n * - Subtraction cannot overflow.\n */\n function sub(uint256 a, uint256 b, uint256 errorCode) internal pure returns (uint256) {\n _require(b <= a, errorCode);\n uint256 c = a - b;\n\n return c;\n }\n}\n" }, "contracts/lib/math/Math.sol": { "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"../helpers/BalancerErrors.sol\";\n\n/**\n * @dev Wrappers over Solidity's arithmetic operations with added overflow checks.\n * Adapted from OpenZeppelin's SafeMath library\n */\nlibrary Math {\n /**\n * @dev Returns the addition of two unsigned integers of 256 bits, reverting on overflow.\n */\n function add(uint256 a, uint256 b) internal pure returns (uint256) {\n uint256 c = a + b;\n _require(c >= a, Errors.ADD_OVERFLOW);\n return c;\n }\n\n /**\n * @dev Returns the addition of two signed integers, reverting on overflow.\n */\n function add(int256 a, int256 b) internal pure returns (int256) {\n int256 c = a + b;\n _require((b >= 0 && c >= a) || (b < 0 && c < a), Errors.ADD_OVERFLOW);\n return c;\n }\n\n /**\n * @dev Returns the subtraction of two unsigned integers of 256 bits, reverting on overflow.\n */\n function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n _require(b <= a, Errors.SUB_OVERFLOW);\n uint256 c = a - b;\n return c;\n }\n\n /**\n * @dev Returns the subtraction of two signed integers, reverting on overflow.\n */\n function sub(int256 a, int256 b) internal pure returns (int256) {\n int256 c = a - b;\n _require((b >= 0 && c <= a) || (b < 0 && c > a), Errors.SUB_OVERFLOW);\n return c;\n }\n\n /**\n * @dev Returns the largest of two numbers of 256 bits.\n */\n function max(uint256 a, uint256 b) internal pure returns (uint256) {\n return a >= b ? a : b;\n }\n\n /**\n * @dev Returns the smallest of two numbers of 256 bits.\n */\n function min(uint256 a, uint256 b) internal pure returns (uint256) {\n return a < b ? a : b;\n }\n\n function mul(uint256 a, uint256 b) internal pure returns (uint256) {\n uint256 c = a * b;\n _require(a == 0 || c / a == b, Errors.MUL_OVERFLOW);\n return c;\n }\n\n function divDown(uint256 a, uint256 b) internal pure returns (uint256) {\n _require(b != 0, Errors.ZERO_DIVISION);\n return a / b;\n }\n\n function divUp(uint256 a, uint256 b) internal pure returns (uint256) {\n _require(b != 0, Errors.ZERO_DIVISION);\n\n if (a == 0) {\n return 0;\n } else {\n return 1 + (a - 1) / b;\n }\n }\n}\n" }, "contracts/lib/helpers/WordCodec.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Library for encoding and decoding values stored inside a 256 bit word. Typically used to pack multiple values in\n * a single storage slot, saving gas by performing less storage accesses.\n *\n * Each value is defined by its size and the least significant bit in the word, also known as offset. For example, two\n * 128 bit values may be encoded in a word by assigning one an offset of 0, and the other an offset of 128.\n */\nlibrary WordCodec {\n // Masks are values with the least significant N bits set. They can be used to extract an encoded value from a word,\n // or to insert a new one replacing the old.\n uint256 private constant _MASK_1 = 2**(1) - 1;\n uint256 private constant _MASK_10 = 2**(10) - 1;\n uint256 private constant _MASK_22 = 2**(22) - 1;\n uint256 private constant _MASK_31 = 2**(31) - 1;\n uint256 private constant _MASK_53 = 2**(53) - 1;\n uint256 private constant _MASK_64 = 2**(64) - 1;\n\n // Largest positive values that can be represented as N bits signed integers.\n int256 private constant _MAX_INT_22 = 2**(21) - 1;\n int256 private constant _MAX_INT_53 = 2**(52) - 1;\n\n // In-place insertion\n\n /**\n * @dev Inserts a boolean value shifted by an offset into a 256 bit word, replacing the old value. Returns the new\n * word.\n */\n function insertBoolean(\n bytes32 word,\n bool value,\n uint256 offset\n ) internal pure returns (bytes32) {\n bytes32 clearedWord = bytes32(uint256(word) & ~(_MASK_1 << offset));\n return clearedWord | bytes32(uint256(value ? 1 : 0) << offset);\n }\n\n // Unsigned\n\n /**\n * @dev Inserts a 10 bit unsigned integer shifted by an offset into a 256 bit word, replacing the old value. Returns\n * the new word.\n *\n * Assumes `value` can be represented using 10 bits.\n */\n function insertUint10(\n bytes32 word,\n uint256 value,\n uint256 offset\n ) internal pure returns (bytes32) {\n bytes32 clearedWord = bytes32(uint256(word) & ~(_MASK_10 << offset));\n return clearedWord | bytes32(value << offset);\n }\n\n /**\n * @dev Inserts a 31 bit unsigned integer shifted by an offset into a 256 bit word, replacing the old value. Returns\n * the new word.\n *\n * Assumes `value` can be represented using 31 bits.\n */\n function insertUint31(\n bytes32 word,\n uint256 value,\n uint256 offset\n ) internal pure returns (bytes32) {\n bytes32 clearedWord = bytes32(uint256(word) & ~(_MASK_31 << offset));\n return clearedWord | bytes32(value << offset);\n }\n\n /**\n * @dev Inserts a 64 bit unsigned integer shifted by an offset into a 256 bit word, replacing the old value. Returns\n * the new word.\n *\n * Assumes `value` can be represented using 64 bits.\n */\n function insertUint64(\n bytes32 word,\n uint256 value,\n uint256 offset\n ) internal pure returns (bytes32) {\n bytes32 clearedWord = bytes32(uint256(word) & ~(_MASK_64 << offset));\n return clearedWord | bytes32(value << offset);\n }\n\n // Signed\n\n /**\n * @dev Inserts a 22 bits signed integer shifted by an offset into a 256 bit word, replacing the old value. Returns\n * the new word.\n *\n * Assumes `value` can be represented using 22 bits.\n */\n function insertInt22(\n bytes32 word,\n int256 value,\n uint256 offset\n ) internal pure returns (bytes32) {\n bytes32 clearedWord = bytes32(uint256(word) & ~(_MASK_22 << offset));\n // Integer values need masking to remove the upper bits of negative values.\n return clearedWord | bytes32((uint256(value) & _MASK_22) << offset);\n }\n\n // Encoding\n\n // Unsigned\n\n /**\n * @dev Encodes a 31 bit unsigned integer shifted by an offset.\n *\n * The return value can be logically ORed with other encoded values to form a 256 bit word.\n */\n function encodeUint31(uint256 value, uint256 offset) internal pure returns (bytes32) {\n return bytes32(value << offset);\n }\n\n // Signed\n\n /**\n * @dev Encodes a 22 bits signed integer shifted by an offset.\n *\n * The return value can be logically ORed with other encoded values to form a 256 bit word.\n */\n function encodeInt22(int256 value, uint256 offset) internal pure returns (bytes32) {\n // Integer values need masking to remove the upper bits of negative values.\n return bytes32((uint256(value) & _MASK_22) << offset);\n }\n\n /**\n * @dev Encodes a 53 bits signed integer shifted by an offset.\n *\n * The return value can be logically ORed with other encoded values to form a 256 bit word.\n */\n function encodeInt53(int256 value, uint256 offset) internal pure returns (bytes32) {\n // Integer values need masking to remove the upper bits of negative values.\n return bytes32((uint256(value) & _MASK_53) << offset);\n }\n\n // Decoding\n\n /**\n * @dev Decodes and returns a boolean shifted by an offset from a 256 bit word.\n */\n function decodeBool(bytes32 word, uint256 offset) internal pure returns (bool) {\n return (uint256(word >> offset) & _MASK_1) == 1;\n }\n\n // Unsigned\n\n /**\n * @dev Decodes and returns a 10 bit unsigned integer shifted by an offset from a 256 bit word.\n */\n function decodeUint10(bytes32 word, uint256 offset) internal pure returns (uint256) {\n return uint256(word >> offset) & _MASK_10;\n }\n\n /**\n * @dev Decodes and returns a 31 bit unsigned integer shifted by an offset from a 256 bit word.\n */\n function decodeUint31(bytes32 word, uint256 offset) internal pure returns (uint256) {\n return uint256(word >> offset) & _MASK_31;\n }\n\n /**\n * @dev Decodes and returns a 64 bit unsigned integer shifted by an offset from a 256 bit word.\n */\n function decodeUint64(bytes32 word, uint256 offset) internal pure returns (uint256) {\n return uint256(word >> offset) & _MASK_64;\n }\n\n // Signed\n\n /**\n * @dev Decodes and returns a 22 bits signed integer shifted by an offset from a 256 bit word.\n */\n function decodeInt22(bytes32 word, uint256 offset) internal pure returns (int256) {\n int256 value = int256(uint256(word >> offset) & _MASK_22);\n // In case the decoded value is greater than the max positive integer that can be represented with 22 bits,\n // we know it was originally a negative integer. Therefore, we mask it to restore the sign in the 256 bit\n // representation.\n return value > _MAX_INT_22 ? (value | int256(~_MASK_22)) : value;\n }\n\n /**\n * @dev Decodes and returns a 53 bits signed integer shifted by an offset from a 256 bit word.\n */\n function decodeInt53(bytes32 word, uint256 offset) internal pure returns (int256) {\n int256 value = int256(uint256(word >> offset) & _MASK_53);\n // In case the decoded value is greater than the max positive integer that can be represented with 53 bits,\n // we know it was originally a negative integer. Therefore, we mask it to restore the sign in the 256 bit\n // representation.\n return value > _MAX_INT_53 ? (value | int256(~_MASK_53)) : value;\n }\n}\n" }, "contracts/pools/weighted/WeightedPool.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../../lib/math/FixedPoint.sol\";\nimport \"../../lib/helpers/InputHelpers.sol\";\n\nimport \"../BaseMinimalSwapInfoPool.sol\";\n\nimport \"./WeightedMath.sol\";\nimport \"./WeightedPoolUserDataHelpers.sol\";\n\n// This contract relies on tons of immutable state variables to perform efficient lookup, without resorting to storage\n// reads. Because immutable arrays are not supported, we instead declare a fixed set of state variables plus total\n// count, resulting in a large number of state variables.\n\ncontract WeightedPool is BaseMinimalSwapInfoPool, WeightedMath {\n using FixedPoint for uint256;\n using WeightedPoolUserDataHelpers for bytes;\n\n // The protocol fees will always be charged using the token associated with the max weight in the pool.\n // Since these Pools will register tokens only once, we can assume this index will be constant.\n uint256 private immutable _maxWeightTokenIndex;\n\n uint256 private immutable _normalizedWeight0;\n uint256 private immutable _normalizedWeight1;\n uint256 private immutable _normalizedWeight2;\n uint256 private immutable _normalizedWeight3;\n uint256 private immutable _normalizedWeight4;\n uint256 private immutable _normalizedWeight5;\n uint256 private immutable _normalizedWeight6;\n uint256 private immutable _normalizedWeight7;\n\n uint256 private _lastInvariant;\n\n enum JoinKind { INIT, EXACT_TOKENS_IN_FOR_BPT_OUT, TOKEN_IN_FOR_EXACT_BPT_OUT }\n enum ExitKind { EXACT_BPT_IN_FOR_ONE_TOKEN_OUT, EXACT_BPT_IN_FOR_TOKENS_OUT, BPT_IN_FOR_EXACT_TOKENS_OUT }\n\n constructor(\n IVault vault,\n string memory name,\n string memory symbol,\n IERC20[] memory tokens,\n uint256[] memory normalizedWeights,\n uint256 swapFeePercentage,\n uint256 pauseWindowDuration,\n uint256 bufferPeriodDuration,\n address owner\n )\n BaseMinimalSwapInfoPool(\n vault,\n name,\n symbol,\n tokens,\n swapFeePercentage,\n pauseWindowDuration,\n bufferPeriodDuration,\n owner\n )\n {\n uint256 numTokens = tokens.length;\n InputHelpers.ensureInputLengthMatch(numTokens, normalizedWeights.length);\n\n // Ensure each normalized weight is above them minimum and find the token index of the maximum weight\n uint256 normalizedSum = 0;\n uint256 maxWeightTokenIndex = 0;\n uint256 maxNormalizedWeight = 0;\n for (uint8 i = 0; i < numTokens; i++) {\n uint256 normalizedWeight = normalizedWeights[i];\n _require(normalizedWeight >= _MIN_WEIGHT, Errors.MIN_WEIGHT);\n\n normalizedSum = normalizedSum.add(normalizedWeight);\n if (normalizedWeight > maxNormalizedWeight) {\n maxWeightTokenIndex = i;\n maxNormalizedWeight = normalizedWeight;\n }\n }\n // Ensure that the normalized weights sum to ONE\n _require(normalizedSum == FixedPoint.ONE, Errors.NORMALIZED_WEIGHT_INVARIANT);\n\n _maxWeightTokenIndex = maxWeightTokenIndex;\n _normalizedWeight0 = normalizedWeights.length > 0 ? normalizedWeights[0] : 0;\n _normalizedWeight1 = normalizedWeights.length > 1 ? normalizedWeights[1] : 0;\n _normalizedWeight2 = normalizedWeights.length > 2 ? normalizedWeights[2] : 0;\n _normalizedWeight3 = normalizedWeights.length > 3 ? normalizedWeights[3] : 0;\n _normalizedWeight4 = normalizedWeights.length > 4 ? normalizedWeights[4] : 0;\n _normalizedWeight5 = normalizedWeights.length > 5 ? normalizedWeights[5] : 0;\n _normalizedWeight6 = normalizedWeights.length > 6 ? normalizedWeights[6] : 0;\n _normalizedWeight7 = normalizedWeights.length > 7 ? normalizedWeights[7] : 0;\n }\n\n function _normalizedWeight(IERC20 token) internal view virtual returns (uint256) {\n // prettier-ignore\n if (token == _token0) { return _normalizedWeight0; }\n else if (token == _token1) { return _normalizedWeight1; }\n else if (token == _token2) { return _normalizedWeight2; }\n else if (token == _token3) { return _normalizedWeight3; }\n else if (token == _token4) { return _normalizedWeight4; }\n else if (token == _token5) { return _normalizedWeight5; }\n else if (token == _token6) { return _normalizedWeight6; }\n else if (token == _token7) { return _normalizedWeight7; }\n else {\n _revert(Errors.INVALID_TOKEN);\n }\n }\n\n function _normalizedWeights() internal view virtual returns (uint256[] memory) {\n uint256 totalTokens = _getTotalTokens();\n uint256[] memory normalizedWeights = new uint256[](totalTokens);\n\n // prettier-ignore\n {\n if (totalTokens > 0) { normalizedWeights[0] = _normalizedWeight0; } else { return normalizedWeights; }\n if (totalTokens > 1) { normalizedWeights[1] = _normalizedWeight1; } else { return normalizedWeights; }\n if (totalTokens > 2) { normalizedWeights[2] = _normalizedWeight2; } else { return normalizedWeights; }\n if (totalTokens > 3) { normalizedWeights[3] = _normalizedWeight3; } else { return normalizedWeights; }\n if (totalTokens > 4) { normalizedWeights[4] = _normalizedWeight4; } else { return normalizedWeights; }\n if (totalTokens > 5) { normalizedWeights[5] = _normalizedWeight5; } else { return normalizedWeights; }\n if (totalTokens > 6) { normalizedWeights[6] = _normalizedWeight6; } else { return normalizedWeights; }\n if (totalTokens > 7) { normalizedWeights[7] = _normalizedWeight7; } else { return normalizedWeights; }\n }\n\n return normalizedWeights;\n }\n\n function getLastInvariant() external view returns (uint256) {\n return _lastInvariant;\n }\n\n /**\n * @dev Returns the current value of the invariant.\n */\n function getInvariant() public view returns (uint256) {\n (, uint256[] memory balances, ) = getVault().getPoolTokens(getPoolId());\n\n // Since the Pool hooks always work with upscaled balances, we manually\n // upscale here for consistency\n _upscaleArray(balances, _scalingFactors());\n\n uint256[] memory normalizedWeights = _normalizedWeights();\n return WeightedMath._calculateInvariant(normalizedWeights, balances);\n }\n\n function getNormalizedWeights() external view returns (uint256[] memory) {\n return _normalizedWeights();\n }\n\n // Base Pool handlers\n\n // Swap\n\n function _onSwapGivenIn(\n SwapRequest memory swapRequest,\n uint256 currentBalanceTokenIn,\n uint256 currentBalanceTokenOut\n ) internal view virtual override whenNotPaused returns (uint256) {\n // Swaps are disabled while the contract is paused.\n\n return\n WeightedMath._calcOutGivenIn(\n currentBalanceTokenIn,\n _normalizedWeight(swapRequest.tokenIn),\n currentBalanceTokenOut,\n _normalizedWeight(swapRequest.tokenOut),\n swapRequest.amount\n );\n }\n\n function _onSwapGivenOut(\n SwapRequest memory swapRequest,\n uint256 currentBalanceTokenIn,\n uint256 currentBalanceTokenOut\n ) internal view virtual override whenNotPaused returns (uint256) {\n // Swaps are disabled while the contract is paused.\n\n return\n WeightedMath._calcInGivenOut(\n currentBalanceTokenIn,\n _normalizedWeight(swapRequest.tokenIn),\n currentBalanceTokenOut,\n _normalizedWeight(swapRequest.tokenOut),\n swapRequest.amount\n );\n }\n\n // Initialize\n\n function _onInitializePool(\n bytes32,\n address,\n address,\n bytes memory userData\n ) internal virtual override whenNotPaused returns (uint256, uint256[] memory) {\n // It would be strange for the Pool to be paused before it is initialized, but for consistency we prevent\n // initialization in this case.\n\n WeightedPool.JoinKind kind = userData.joinKind();\n _require(kind == WeightedPool.JoinKind.INIT, Errors.UNINITIALIZED);\n\n uint256[] memory amountsIn = userData.initialAmountsIn();\n InputHelpers.ensureInputLengthMatch(_getTotalTokens(), amountsIn.length);\n _upscaleArray(amountsIn, _scalingFactors());\n\n uint256[] memory normalizedWeights = _normalizedWeights();\n\n uint256 invariantAfterJoin = WeightedMath._calculateInvariant(normalizedWeights, amountsIn);\n\n // Set the initial BPT to the value of the invariant times the number of tokens. This makes BPT supply more\n // consistent in Pools with similar compositions but different number of tokens.\n uint256 bptAmountOut = Math.mul(invariantAfterJoin, _getTotalTokens());\n\n _lastInvariant = invariantAfterJoin;\n\n return (bptAmountOut, amountsIn);\n }\n\n // Join\n\n function _onJoinPool(\n bytes32,\n address,\n address,\n uint256[] memory balances,\n uint256,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n )\n internal\n virtual\n override\n whenNotPaused\n returns (\n uint256,\n uint256[] memory,\n uint256[] memory\n )\n {\n // All joins are disabled while the contract is paused.\n\n uint256[] memory normalizedWeights = _normalizedWeights();\n\n // Due protocol swap fee amounts are computed by measuring the growth of the invariant between the previous join\n // or exit event and now - the invariant's growth is due exclusively to swap fees. This avoids spending gas\n // computing them on each individual swap\n uint256 invariantBeforeJoin = WeightedMath._calculateInvariant(normalizedWeights, balances);\n\n uint256[] memory dueProtocolFeeAmounts = _getDueProtocolFeeAmounts(\n balances,\n normalizedWeights,\n _lastInvariant,\n invariantBeforeJoin,\n protocolSwapFeePercentage\n );\n\n // Update current balances by subtracting the protocol fee amounts\n _mutateAmounts(balances, dueProtocolFeeAmounts, FixedPoint.sub);\n (uint256 bptAmountOut, uint256[] memory amountsIn) = _doJoin(balances, normalizedWeights, userData);\n\n // Update the invariant with the balances the Pool will have after the join, in order to compute the\n // protocol swap fee amounts due in future joins and exits.\n _lastInvariant = _invariantAfterJoin(balances, amountsIn, normalizedWeights);\n\n return (bptAmountOut, amountsIn, dueProtocolFeeAmounts);\n }\n\n function _doJoin(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n bytes memory userData\n ) private view returns (uint256, uint256[] memory) {\n JoinKind kind = userData.joinKind();\n\n if (kind == JoinKind.EXACT_TOKENS_IN_FOR_BPT_OUT) {\n return _joinExactTokensInForBPTOut(balances, normalizedWeights, userData);\n } else if (kind == JoinKind.TOKEN_IN_FOR_EXACT_BPT_OUT) {\n return _joinTokenInForExactBPTOut(balances, normalizedWeights, userData);\n } else {\n _revert(Errors.UNHANDLED_JOIN_KIND);\n }\n }\n\n function _joinExactTokensInForBPTOut(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n bytes memory userData\n ) private view returns (uint256, uint256[] memory) {\n (uint256[] memory amountsIn, uint256 minBPTAmountOut) = userData.exactTokensInForBptOut();\n InputHelpers.ensureInputLengthMatch(_getTotalTokens(), amountsIn.length);\n\n _upscaleArray(amountsIn, _scalingFactors());\n\n uint256 bptAmountOut = WeightedMath._calcBptOutGivenExactTokensIn(\n balances,\n normalizedWeights,\n amountsIn,\n totalSupply(),\n _swapFeePercentage\n );\n\n _require(bptAmountOut >= minBPTAmountOut, Errors.BPT_OUT_MIN_AMOUNT);\n\n return (bptAmountOut, amountsIn);\n }\n\n function _joinTokenInForExactBPTOut(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n bytes memory userData\n ) private view returns (uint256, uint256[] memory) {\n (uint256 bptAmountOut, uint256 tokenIndex) = userData.tokenInForExactBptOut();\n // Note that there is no maximum amountIn parameter: this is handled by `IVault.joinPool`.\n\n _require(tokenIndex < _getTotalTokens(), Errors.OUT_OF_BOUNDS);\n\n uint256[] memory amountsIn = new uint256[](_getTotalTokens());\n amountsIn[tokenIndex] = WeightedMath._calcTokenInGivenExactBptOut(\n balances[tokenIndex],\n normalizedWeights[tokenIndex],\n bptAmountOut,\n totalSupply(),\n _swapFeePercentage\n );\n\n return (bptAmountOut, amountsIn);\n }\n\n // Exit\n\n function _onExitPool(\n bytes32,\n address,\n address,\n uint256[] memory balances,\n uint256,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n )\n internal\n virtual\n override\n returns (\n uint256 bptAmountIn,\n uint256[] memory amountsOut,\n uint256[] memory dueProtocolFeeAmounts\n )\n {\n // Exits are not completely disabled while the contract is paused: proportional exits (exact BPT in for tokens\n // out) remain functional.\n\n uint256[] memory normalizedWeights = _normalizedWeights();\n\n if (_isNotPaused()) {\n // Due protocol swap fee amounts are computed by measuring the growth of the invariant between the previous\n // join or exit event and now - the invariant's growth is due exclusively to swap fees. This avoids\n // spending gas calculating the fees on each individual swap.\n uint256 invariantBeforeExit = WeightedMath._calculateInvariant(normalizedWeights, balances);\n dueProtocolFeeAmounts = _getDueProtocolFeeAmounts(\n balances,\n normalizedWeights,\n _lastInvariant,\n invariantBeforeExit,\n protocolSwapFeePercentage\n );\n\n // Update current balances by subtracting the protocol fee amounts\n _mutateAmounts(balances, dueProtocolFeeAmounts, FixedPoint.sub);\n } else {\n // If the contract is paused, swap protocol fee amounts are not charged to avoid extra calculations and\n // reduce the potential for errors.\n dueProtocolFeeAmounts = new uint256[](_getTotalTokens());\n }\n\n (bptAmountIn, amountsOut) = _doExit(balances, normalizedWeights, userData);\n\n // Update the invariant with the balances the Pool will have after the exit, in order to compute the\n // protocol swap fees due in future joins and exits.\n _lastInvariant = _invariantAfterExit(balances, amountsOut, normalizedWeights);\n\n return (bptAmountIn, amountsOut, dueProtocolFeeAmounts);\n }\n\n function _doExit(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n bytes memory userData\n ) private view returns (uint256, uint256[] memory) {\n ExitKind kind = userData.exitKind();\n\n if (kind == ExitKind.EXACT_BPT_IN_FOR_ONE_TOKEN_OUT) {\n return _exitExactBPTInForTokenOut(balances, normalizedWeights, userData);\n } else if (kind == ExitKind.EXACT_BPT_IN_FOR_TOKENS_OUT) {\n return _exitExactBPTInForTokensOut(balances, userData);\n } else {\n // ExitKind.BPT_IN_FOR_EXACT_TOKENS_OUT\n return _exitBPTInForExactTokensOut(balances, normalizedWeights, userData);\n }\n }\n\n function _exitExactBPTInForTokenOut(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n bytes memory userData\n ) private view whenNotPaused returns (uint256, uint256[] memory) {\n // This exit function is disabled if the contract is paused.\n\n (uint256 bptAmountIn, uint256 tokenIndex) = userData.exactBptInForTokenOut();\n // Note that there is no minimum amountOut parameter: this is handled by `IVault.exitPool`.\n\n _require(tokenIndex < _getTotalTokens(), Errors.OUT_OF_BOUNDS);\n\n // We exit in a single token, so we initialize amountsOut with zeros\n uint256[] memory amountsOut = new uint256[](_getTotalTokens());\n\n // And then assign the result to the selected token\n amountsOut[tokenIndex] = WeightedMath._calcTokenOutGivenExactBptIn(\n balances[tokenIndex],\n normalizedWeights[tokenIndex],\n bptAmountIn,\n totalSupply(),\n _swapFeePercentage\n );\n\n return (bptAmountIn, amountsOut);\n }\n\n function _exitExactBPTInForTokensOut(uint256[] memory balances, bytes memory userData)\n private\n view\n returns (uint256, uint256[] memory)\n {\n // This exit function is the only one that is not disabled if the contract is paused: it remains unrestricted\n // in an attempt to provide users with a mechanism to retrieve their tokens in case of an emergency.\n // This particular exit function is the only one that remains available because it is the simplest one, and\n // therefore the one with the lowest likelihood of errors.\n\n uint256 bptAmountIn = userData.exactBptInForTokensOut();\n // Note that there is no minimum amountOut parameter: this is handled by `IVault.exitPool`.\n\n uint256[] memory amountsOut = WeightedMath._calcTokensOutGivenExactBptIn(balances, bptAmountIn, totalSupply());\n return (bptAmountIn, amountsOut);\n }\n\n function _exitBPTInForExactTokensOut(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n bytes memory userData\n ) private view whenNotPaused returns (uint256, uint256[] memory) {\n // This exit function is disabled if the contract is paused.\n\n (uint256[] memory amountsOut, uint256 maxBPTAmountIn) = userData.bptInForExactTokensOut();\n InputHelpers.ensureInputLengthMatch(amountsOut.length, _getTotalTokens());\n _upscaleArray(amountsOut, _scalingFactors());\n\n uint256 bptAmountIn = WeightedMath._calcBptInGivenExactTokensOut(\n balances,\n normalizedWeights,\n amountsOut,\n totalSupply(),\n _swapFeePercentage\n );\n _require(bptAmountIn <= maxBPTAmountIn, Errors.BPT_IN_MAX_AMOUNT);\n\n return (bptAmountIn, amountsOut);\n }\n\n // Helpers\n\n function _getDueProtocolFeeAmounts(\n uint256[] memory balances,\n uint256[] memory normalizedWeights,\n uint256 previousInvariant,\n uint256 currentInvariant,\n uint256 protocolSwapFeePercentage\n ) private view returns (uint256[] memory) {\n // Initialize with zeros\n uint256[] memory dueProtocolFeeAmounts = new uint256[](_getTotalTokens());\n\n // Early return if the protocol swap fee percentage is zero, saving gas.\n if (protocolSwapFeePercentage == 0) {\n return dueProtocolFeeAmounts;\n }\n\n // The protocol swap fees are always paid using the token with the largest weight in the Pool. As this is the\n // token that is expected to have the largest balance, using it to pay fees should not unbalance the Pool.\n dueProtocolFeeAmounts[_maxWeightTokenIndex] = WeightedMath._calcDueTokenProtocolSwapFeeAmount(\n balances[_maxWeightTokenIndex],\n normalizedWeights[_maxWeightTokenIndex],\n previousInvariant,\n currentInvariant,\n protocolSwapFeePercentage\n );\n\n return dueProtocolFeeAmounts;\n }\n\n /**\n * @dev Returns the value of the invariant given `balances`, assuming they are increased by `amountsIn`. All\n * amounts are expected to be upscaled.\n */\n function _invariantAfterJoin(\n uint256[] memory balances,\n uint256[] memory amountsIn,\n uint256[] memory normalizedWeights\n ) private view returns (uint256) {\n _mutateAmounts(balances, amountsIn, FixedPoint.add);\n return WeightedMath._calculateInvariant(normalizedWeights, balances);\n }\n\n function _invariantAfterExit(\n uint256[] memory balances,\n uint256[] memory amountsOut,\n uint256[] memory normalizedWeights\n ) private view returns (uint256) {\n _mutateAmounts(balances, amountsOut, FixedPoint.sub);\n return WeightedMath._calculateInvariant(normalizedWeights, balances);\n }\n\n /**\n * @dev Mutates `amounts` by applying `mutation` with each entry in `arguments`.\n *\n * Equivalent to `amounts = amounts.map(mutation)`.\n */\n function _mutateAmounts(\n uint256[] memory toMutate,\n uint256[] memory arguments,\n function(uint256, uint256) pure returns (uint256) mutation\n ) private view {\n for (uint256 i = 0; i < _getTotalTokens(); ++i) {\n toMutate[i] = mutation(toMutate[i], arguments[i]);\n }\n }\n\n /**\n * @dev This function returns the appreciation of one BPT relative to the\n * underlying tokens. This starts at 1 when the pool is created and grows over time\n */\n function getRate() public view returns (uint256) {\n // The initial BPT supply is equal to the invariant times the number of tokens.\n return Math.mul(getInvariant(), _getTotalTokens()).divDown(totalSupply());\n }\n}\n" }, "contracts/pools/BaseMinimalSwapInfoPool.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"./BasePool.sol\";\nimport \"../vault/interfaces/IMinimalSwapInfoPool.sol\";\n\n/**\n * @dev Extension of `BasePool`, adding a handler for `IMinimalSwapInfoPool.onSwap`.\n *\n * Derived contracts must implement `_onSwapGivenIn` and `_onSwapGivenOut` along with `BasePool`'s virtual functions.\n */\nabstract contract BaseMinimalSwapInfoPool is IMinimalSwapInfoPool, BasePool {\n constructor(\n IVault vault,\n string memory name,\n string memory symbol,\n IERC20[] memory tokens,\n uint256 swapFeePercentage,\n uint256 pauseWindowDuration,\n uint256 bufferPeriodDuration,\n address owner\n )\n BasePool(\n vault,\n tokens.length == 2 ? IVault.PoolSpecialization.TWO_TOKEN : IVault.PoolSpecialization.MINIMAL_SWAP_INFO,\n name,\n symbol,\n tokens,\n swapFeePercentage,\n pauseWindowDuration,\n bufferPeriodDuration,\n owner\n )\n {\n // solhint-disable-previous-line no-empty-blocks\n }\n\n // Swap Hooks\n\n function onSwap(\n SwapRequest memory request,\n uint256 balanceTokenIn,\n uint256 balanceTokenOut\n ) external view virtual override returns (uint256) {\n uint256 scalingFactorTokenIn = _scalingFactor(request.tokenIn);\n uint256 scalingFactorTokenOut = _scalingFactor(request.tokenOut);\n\n if (request.kind == IVault.SwapKind.GIVEN_IN) {\n // Fees are subtracted before scaling, to reduce the complexity of the rounding direction analysis.\n request.amount = _subtractSwapFeeAmount(request.amount);\n\n // All token amounts are upscaled.\n balanceTokenIn = _upscale(balanceTokenIn, scalingFactorTokenIn);\n balanceTokenOut = _upscale(balanceTokenOut, scalingFactorTokenOut);\n request.amount = _upscale(request.amount, scalingFactorTokenIn);\n\n uint256 amountOut = _onSwapGivenIn(request, balanceTokenIn, balanceTokenOut);\n\n // amountOut tokens are exiting the Pool, so we round down.\n return _downscaleDown(amountOut, scalingFactorTokenOut);\n } else {\n // All token amounts are upscaled.\n balanceTokenIn = _upscale(balanceTokenIn, scalingFactorTokenIn);\n balanceTokenOut = _upscale(balanceTokenOut, scalingFactorTokenOut);\n request.amount = _upscale(request.amount, scalingFactorTokenOut);\n\n uint256 amountIn = _onSwapGivenOut(request, balanceTokenIn, balanceTokenOut);\n\n // amountIn tokens are entering the Pool, so we round up.\n amountIn = _downscaleUp(amountIn, scalingFactorTokenIn);\n\n // Fees are added after scaling happens, to reduce the complexity of the rounding direction analysis.\n return _addSwapFeeAmount(amountIn);\n }\n }\n\n /*\n * @dev Called when a swap with the Pool occurs, where the amount of tokens entering the Pool is known.\n *\n * Returns the amount of tokens that will be taken from the Pool in return.\n *\n * All amounts inside `swapRequest`, `balanceTokenIn` and `balanceTokenOut` are upscaled. The swap fee has already\n * been deducted from `swapRequest.amount`.\n *\n * The return value is also considered upscaled, and will be downscaled (rounding down) before returning it to the\n * Vault.\n */\n function _onSwapGivenIn(\n SwapRequest memory swapRequest,\n uint256 balanceTokenIn,\n uint256 balanceTokenOut\n ) internal view virtual returns (uint256);\n\n /*\n * @dev Called when a swap with the Pool occurs, where the amount of tokens exiting the Pool is known.\n *\n * Returns the amount of tokens that will be granted to the Pool in return.\n *\n * All amounts inside `swapRequest`, `balanceTokenIn` and `balanceTokenOut` are upscaled.\n *\n * The return value is also considered upscaled, and will be downscaled (rounding up) before applying the swap fee\n * and returning it to the Vault.\n */\n function _onSwapGivenOut(\n SwapRequest memory swapRequest,\n uint256 balanceTokenIn,\n uint256 balanceTokenOut\n ) internal view virtual returns (uint256);\n}\n" }, "contracts/pools/BasePool.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../lib/math/FixedPoint.sol\";\nimport \"../lib/helpers/InputHelpers.sol\";\nimport \"../lib/helpers/TemporarilyPausable.sol\";\nimport \"../lib/openzeppelin/ERC20.sol\";\n\nimport \"./BalancerPoolToken.sol\";\nimport \"./BasePoolAuthorization.sol\";\nimport \"../vault/interfaces/IVault.sol\";\nimport \"../vault/interfaces/IBasePool.sol\";\n\n// This contract relies on tons of immutable state variables to perform efficient lookup, without resorting to storage\n// reads. Because immutable arrays are not supported, we instead declare a fixed set of state variables plus a total\n// count, resulting in a large number of state variables.\n\n// solhint-disable max-states-count\n\n/**\n * @dev Reference implementation for the base layer of a Pool contract that manages a single Pool with an immutable set\n * of registered tokens, no Asset Managers, an admin-controlled swap fee percentage, and an emergency pause mechanism.\n *\n * Note that neither swap fees nor the pause mechanism are used by this contract. They are passed through so that\n * derived contracts can use them via the `_addSwapFeeAmount` and `_subtractSwapFeeAmount` functions, and the\n * `whenNotPaused` modifier.\n *\n * No admin permissions are checked here: instead, this contract delegates that to the Vault's own Authorizer.\n *\n * Because this contract doesn't implement the swap hooks, derived contracts should generally inherit from\n * BaseGeneralPool or BaseMinimalSwapInfoPool. Otherwise, subclasses must inherit from the corresponding interfaces\n * and implement the swap callbacks themselves.\n */\nabstract contract BasePool is IBasePool, BasePoolAuthorization, BalancerPoolToken, TemporarilyPausable {\n using FixedPoint for uint256;\n\n uint256 private constant _MIN_TOKENS = 2;\n uint256 private constant _MAX_TOKENS = 8;\n\n // 1e18 corresponds to 1.0, or a 100% fee\n uint256 private constant _MIN_SWAP_FEE_PERCENTAGE = 1e12; // 0.0001%\n uint256 private constant _MAX_SWAP_FEE_PERCENTAGE = 1e17; // 10%\n\n uint256 private constant _MINIMUM_BPT = 1e6;\n\n uint256 internal _swapFeePercentage;\n\n IVault private immutable _vault;\n bytes32 private immutable _poolId;\n uint256 private immutable _totalTokens;\n\n IERC20 internal immutable _token0;\n IERC20 internal immutable _token1;\n IERC20 internal immutable _token2;\n IERC20 internal immutable _token3;\n IERC20 internal immutable _token4;\n IERC20 internal immutable _token5;\n IERC20 internal immutable _token6;\n IERC20 internal immutable _token7;\n\n // All token balances are normalized to behave as if the token had 18 decimals. We assume a token's decimals will\n // not change throughout its lifetime, and store the corresponding scaling factor for each at construction time.\n // These factors are always greater than or equal to one: tokens with more than 18 decimals are not supported.\n\n uint256 internal immutable _scalingFactor0;\n uint256 internal immutable _scalingFactor1;\n uint256 internal immutable _scalingFactor2;\n uint256 internal immutable _scalingFactor3;\n uint256 internal immutable _scalingFactor4;\n uint256 internal immutable _scalingFactor5;\n uint256 internal immutable _scalingFactor6;\n uint256 internal immutable _scalingFactor7;\n\n event SwapFeePercentageChanged(uint256 swapFeePercentage);\n\n constructor(\n IVault vault,\n IVault.PoolSpecialization specialization,\n string memory name,\n string memory symbol,\n IERC20[] memory tokens,\n uint256 swapFeePercentage,\n uint256 pauseWindowDuration,\n uint256 bufferPeriodDuration,\n address owner\n )\n // Base Pools are expected to be deployed using factories. By using the factory address as the action\n // disambiguator, we make all Pools deployed by the same factory share action identifiers. This allows for\n // simpler management of permissions (such as being able to manage granting the 'set fee percentage' action in\n // any Pool created by the same factory), while still making action identifiers unique among different factories\n // if the selectors match, preventing accidental errors.\n Authentication(bytes32(uint256(msg.sender)))\n BalancerPoolToken(name, symbol)\n BasePoolAuthorization(owner)\n TemporarilyPausable(pauseWindowDuration, bufferPeriodDuration)\n {\n _require(tokens.length >= _MIN_TOKENS, Errors.MIN_TOKENS);\n _require(tokens.length <= _MAX_TOKENS, Errors.MAX_TOKENS);\n\n // The Vault only requires the token list to be ordered for the Two Token Pools specialization. However,\n // to make the developer experience consistent, we are requiring this condition for all the native pools.\n // Also, since these Pools will register tokens only once, we can ensure the Pool tokens will follow the same\n // order. We rely on this property to make Pools simpler to write, as it lets us assume that the\n // order of token-specific parameters (such as token weights) will not change.\n InputHelpers.ensureArrayIsSorted(tokens);\n\n _setSwapFeePercentage(swapFeePercentage);\n\n bytes32 poolId = vault.registerPool(specialization);\n\n // Pass in zero addresses for Asset Managers\n vault.registerTokens(poolId, tokens, new address[](tokens.length));\n\n // Set immutable state variables - these cannot be read from during construction\n _vault = vault;\n _poolId = poolId;\n _totalTokens = tokens.length;\n\n // Immutable variables cannot be initialized inside an if statement, so we must do conditional assignments\n _token0 = tokens.length > 0 ? tokens[0] : IERC20(0);\n _token1 = tokens.length > 1 ? tokens[1] : IERC20(0);\n _token2 = tokens.length > 2 ? tokens[2] : IERC20(0);\n _token3 = tokens.length > 3 ? tokens[3] : IERC20(0);\n _token4 = tokens.length > 4 ? tokens[4] : IERC20(0);\n _token5 = tokens.length > 5 ? tokens[5] : IERC20(0);\n _token6 = tokens.length > 6 ? tokens[6] : IERC20(0);\n _token7 = tokens.length > 7 ? tokens[7] : IERC20(0);\n\n _scalingFactor0 = tokens.length > 0 ? _computeScalingFactor(tokens[0]) : 0;\n _scalingFactor1 = tokens.length > 1 ? _computeScalingFactor(tokens[1]) : 0;\n _scalingFactor2 = tokens.length > 2 ? _computeScalingFactor(tokens[2]) : 0;\n _scalingFactor3 = tokens.length > 3 ? _computeScalingFactor(tokens[3]) : 0;\n _scalingFactor4 = tokens.length > 4 ? _computeScalingFactor(tokens[4]) : 0;\n _scalingFactor5 = tokens.length > 5 ? _computeScalingFactor(tokens[5]) : 0;\n _scalingFactor6 = tokens.length > 6 ? _computeScalingFactor(tokens[6]) : 0;\n _scalingFactor7 = tokens.length > 7 ? _computeScalingFactor(tokens[7]) : 0;\n }\n\n // Getters / Setters\n\n function getVault() public view returns (IVault) {\n return _vault;\n }\n\n function getPoolId() public view returns (bytes32) {\n return _poolId;\n }\n\n function _getTotalTokens() internal view returns (uint256) {\n return _totalTokens;\n }\n\n function getSwapFeePercentage() external view returns (uint256) {\n return _swapFeePercentage;\n }\n\n // Caller must be approved by the Vault's Authorizer\n function setSwapFeePercentage(uint256 swapFeePercentage) external virtual authenticate whenNotPaused {\n _setSwapFeePercentage(swapFeePercentage);\n }\n\n function _setSwapFeePercentage(uint256 swapFeePercentage) private {\n _require(swapFeePercentage >= _MIN_SWAP_FEE_PERCENTAGE, Errors.MIN_SWAP_FEE_PERCENTAGE);\n _require(swapFeePercentage <= _MAX_SWAP_FEE_PERCENTAGE, Errors.MAX_SWAP_FEE_PERCENTAGE);\n\n _swapFeePercentage = swapFeePercentage;\n emit SwapFeePercentageChanged(swapFeePercentage);\n }\n\n // Caller must be approved by the Vault's Authorizer\n function setPaused(bool paused) external authenticate {\n _setPaused(paused);\n }\n\n // Join / Exit Hooks\n\n modifier onlyVault(bytes32 poolId) {\n _require(msg.sender == address(getVault()), Errors.CALLER_NOT_VAULT);\n _require(poolId == getPoolId(), Errors.INVALID_POOL_ID);\n _;\n }\n\n function onJoinPool(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n ) external virtual override onlyVault(poolId) returns (uint256[] memory, uint256[] memory) {\n uint256[] memory scalingFactors = _scalingFactors();\n\n if (totalSupply() == 0) {\n (uint256 bptAmountOut, uint256[] memory amountsIn) = _onInitializePool(poolId, sender, recipient, userData);\n\n // On initialization, we lock _MINIMUM_BPT by minting it for the zero address. This BPT acts as a minimum\n // as it will never be burned, which reduces potential issues with rounding, and also prevents the Pool from\n // ever being fully drained.\n _require(bptAmountOut >= _MINIMUM_BPT, Errors.MINIMUM_BPT);\n _mintPoolTokens(address(0), _MINIMUM_BPT);\n _mintPoolTokens(recipient, bptAmountOut - _MINIMUM_BPT);\n\n // amountsIn are amounts entering the Pool, so we round up.\n _downscaleUpArray(amountsIn, scalingFactors);\n\n return (amountsIn, new uint256[](_getTotalTokens()));\n } else {\n _upscaleArray(balances, scalingFactors);\n (uint256 bptAmountOut, uint256[] memory amountsIn, uint256[] memory dueProtocolFeeAmounts) = _onJoinPool(\n poolId,\n sender,\n recipient,\n balances,\n lastChangeBlock,\n protocolSwapFeePercentage,\n userData\n );\n\n // Note we no longer use `balances` after calling `_onJoinPool`, which may mutate it.\n\n _mintPoolTokens(recipient, bptAmountOut);\n\n // amountsIn are amounts entering the Pool, so we round up.\n _downscaleUpArray(amountsIn, scalingFactors);\n // dueProtocolFeeAmounts are amounts exiting the Pool, so we round down.\n _downscaleDownArray(dueProtocolFeeAmounts, scalingFactors);\n\n return (amountsIn, dueProtocolFeeAmounts);\n }\n }\n\n function onExitPool(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n ) external virtual override onlyVault(poolId) returns (uint256[] memory, uint256[] memory) {\n uint256[] memory scalingFactors = _scalingFactors();\n _upscaleArray(balances, scalingFactors);\n\n (uint256 bptAmountIn, uint256[] memory amountsOut, uint256[] memory dueProtocolFeeAmounts) = _onExitPool(\n poolId,\n sender,\n recipient,\n balances,\n lastChangeBlock,\n protocolSwapFeePercentage,\n userData\n );\n\n // Note we no longer use `balances` after calling `_onExitPool`, which may mutate it.\n\n _burnPoolTokens(sender, bptAmountIn);\n\n // Both amountsOut and dueProtocolFeeAmounts are amounts exiting the Pool, so we round down.\n _downscaleDownArray(amountsOut, scalingFactors);\n _downscaleDownArray(dueProtocolFeeAmounts, scalingFactors);\n\n return (amountsOut, dueProtocolFeeAmounts);\n }\n\n // Query functions\n\n /**\n * @dev Returns the amount of BPT that would be granted to `recipient` if the `onJoinPool` hook were called by the\n * Vault with the same arguments, along with the number of tokens `sender` would have to supply.\n *\n * This function is not meant to be called directly, but rather from a helper contract that fetches current Vault\n * data, such as the protocol swap fee percentage and Pool balances.\n *\n * Like `IVault.queryBatchSwap`, this function is not view due to internal implementation details: the caller must\n * explicitly use eth_call instead of eth_sendTransaction.\n */\n function queryJoin(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n ) external returns (uint256 bptOut, uint256[] memory amountsIn) {\n InputHelpers.ensureInputLengthMatch(balances.length, _getTotalTokens());\n\n _queryAction(\n poolId,\n sender,\n recipient,\n balances,\n lastChangeBlock,\n protocolSwapFeePercentage,\n userData,\n _onJoinPool,\n _downscaleUpArray\n );\n\n // The `return` opcode is executed directly inside `_queryAction`, so execution never reaches this statement,\n // and we don't need to return anything here - it just silences compiler warnings.\n return (bptOut, amountsIn);\n }\n\n /**\n * @dev Returns the amount of BPT that would be burned from `sender` if the `onExitPool` hook were called by the\n * Vault with the same arguments, along with the number of tokens `recipient` would receive.\n *\n * This function is not meant to be called directly, but rather from a helper contract that fetches current Vault\n * data, such as the protocol swap fee percentage and Pool balances.\n *\n * Like `IVault.queryBatchSwap`, this function is not view due to internal implementation details: the caller must\n * explicitly use eth_call instead of eth_sendTransaction.\n */\n function queryExit(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n ) external returns (uint256 bptIn, uint256[] memory amountsOut) {\n InputHelpers.ensureInputLengthMatch(balances.length, _getTotalTokens());\n\n _queryAction(\n poolId,\n sender,\n recipient,\n balances,\n lastChangeBlock,\n protocolSwapFeePercentage,\n userData,\n _onExitPool,\n _downscaleDownArray\n );\n\n // The `return` opcode is executed directly inside `_queryAction`, so execution never reaches this statement,\n // and we don't need to return anything here - it just silences compiler warnings.\n return (bptIn, amountsOut);\n }\n\n // Internal hooks to be overridden by derived contracts - all token amounts (except BPT) in these interfaces are\n // upscaled.\n\n /**\n * @dev Called when the Pool is joined for the first time; that is, when the BPT total supply is zero.\n *\n * Returns the amount of BPT to mint, and the token amounts the Pool will receive in return.\n *\n * Minted BPT will be sent to `recipient`, except for _MINIMUM_BPT, which will be deducted from this amount and sent\n * to the zero address instead. This will cause that BPT to remain forever locked there, preventing total BTP from\n * ever dropping below that value, and ensuring `_onInitializePool` can only be called once in the entire Pool's\n * lifetime.\n *\n * The tokens granted to the Pool will be transferred from `sender`. These amounts are considered upscaled and will\n * be downscaled (rounding up) before being returned to the Vault.\n */\n function _onInitializePool(\n bytes32 poolId,\n address sender,\n address recipient,\n bytes memory userData\n ) internal virtual returns (uint256 bptAmountOut, uint256[] memory amountsIn);\n\n /**\n * @dev Called whenever the Pool is joined after the first initialization join (see `_onInitializePool`).\n *\n * Returns the amount of BPT to mint, the token amounts that the Pool will receive in return, and the number of\n * tokens to pay in protocol swap fees.\n *\n * Implementations of this function might choose to mutate the `balances` array to save gas (e.g. when\n * performing intermediate calculations, such as subtraction of due protocol fees). This can be done safely.\n *\n * Minted BPT will be sent to `recipient`.\n *\n * The tokens granted to the Pool will be transferred from `sender`. These amounts are considered upscaled and will\n * be downscaled (rounding up) before being returned to the Vault.\n *\n * Due protocol swap fees will be taken from the Pool's balance in the Vault (see `IBasePool.onJoinPool`). These\n * amounts are considered upscaled and will be downscaled (rounding down) before being returned to the Vault.\n */\n function _onJoinPool(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n )\n internal\n virtual\n returns (\n uint256 bptAmountOut,\n uint256[] memory amountsIn,\n uint256[] memory dueProtocolFeeAmounts\n );\n\n /**\n * @dev Called whenever the Pool is exited.\n *\n * Returns the amount of BPT to burn, the token amounts for each Pool token that the Pool will grant in return, and\n * the number of tokens to pay in protocol swap fees.\n *\n * Implementations of this function might choose to mutate the `balances` array to save gas (e.g. when\n * performing intermediate calculations, such as subtraction of due protocol fees). This can be done safely.\n *\n * BPT will be burnt from `sender`.\n *\n * The Pool will grant tokens to `recipient`. These amounts are considered upscaled and will be downscaled\n * (rounding down) before being returned to the Vault.\n *\n * Due protocol swap fees will be taken from the Pool's balance in the Vault (see `IBasePool.onExitPool`). These\n * amounts are considered upscaled and will be downscaled (rounding down) before being returned to the Vault.\n */\n function _onExitPool(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n )\n internal\n virtual\n returns (\n uint256 bptAmountIn,\n uint256[] memory amountsOut,\n uint256[] memory dueProtocolFeeAmounts\n );\n\n // Internal functions\n\n /**\n * @dev Adds swap fee amount to `amount`, returning a higher value.\n */\n function _addSwapFeeAmount(uint256 amount) internal view returns (uint256) {\n // This returns amount + fee amount, so we round up (favoring a higher fee amount).\n return amount.divUp(_swapFeePercentage.complement());\n }\n\n /**\n * @dev Subtracts swap fee amount from `amount`, returning a lower value.\n */\n function _subtractSwapFeeAmount(uint256 amount) internal view returns (uint256) {\n // This returns amount - fee amount, so we round up (favoring a higher fee amount).\n uint256 feeAmount = amount.mulUp(_swapFeePercentage);\n return amount.sub(feeAmount);\n }\n\n // Scaling\n\n /**\n * @dev Returns a scaling factor that, when multiplied to a token amount for `token`, normalizes its balance as if\n * it had 18 decimals.\n */\n function _computeScalingFactor(IERC20 token) private view returns (uint256) {\n // Tokens that don't implement the `decimals` method are not supported.\n uint256 tokenDecimals = ERC20(address(token)).decimals();\n\n // Tokens with more than 18 decimals are not supported.\n uint256 decimalsDifference = Math.sub(18, tokenDecimals);\n return 10**decimalsDifference;\n }\n\n /**\n * @dev Returns the scaling factor for one of the Pool's tokens. Reverts if `token` is not a token registered by the\n * Pool.\n */\n function _scalingFactor(IERC20 token) internal view returns (uint256) {\n // prettier-ignore\n if (token == _token0) { return _scalingFactor0; }\n else if (token == _token1) { return _scalingFactor1; }\n else if (token == _token2) { return _scalingFactor2; }\n else if (token == _token3) { return _scalingFactor3; }\n else if (token == _token4) { return _scalingFactor4; }\n else if (token == _token5) { return _scalingFactor5; }\n else if (token == _token6) { return _scalingFactor6; }\n else if (token == _token7) { return _scalingFactor7; }\n else {\n _revert(Errors.INVALID_TOKEN);\n }\n }\n\n /**\n * @dev Returns all the scaling factors in the same order as the registered tokens. The Vault will always\n * pass balances in this order when calling any of the Pool hooks\n */\n function _scalingFactors() internal view returns (uint256[] memory) {\n uint256 totalTokens = _getTotalTokens();\n uint256[] memory scalingFactors = new uint256[](totalTokens);\n\n // prettier-ignore\n {\n if (totalTokens > 0) { scalingFactors[0] = _scalingFactor0; } else { return scalingFactors; }\n if (totalTokens > 1) { scalingFactors[1] = _scalingFactor1; } else { return scalingFactors; }\n if (totalTokens > 2) { scalingFactors[2] = _scalingFactor2; } else { return scalingFactors; }\n if (totalTokens > 3) { scalingFactors[3] = _scalingFactor3; } else { return scalingFactors; }\n if (totalTokens > 4) { scalingFactors[4] = _scalingFactor4; } else { return scalingFactors; }\n if (totalTokens > 5) { scalingFactors[5] = _scalingFactor5; } else { return scalingFactors; }\n if (totalTokens > 6) { scalingFactors[6] = _scalingFactor6; } else { return scalingFactors; }\n if (totalTokens > 7) { scalingFactors[7] = _scalingFactor7; } else { return scalingFactors; }\n }\n\n return scalingFactors;\n }\n\n /**\n * @dev Applies `scalingFactor` to `amount`, resulting in a larger or equal value depending on whether it needed\n * scaling or not.\n */\n function _upscale(uint256 amount, uint256 scalingFactor) internal pure returns (uint256) {\n return Math.mul(amount, scalingFactor);\n }\n\n /**\n * @dev Same as `_upscale`, but for an entire array. This function does not return anything, but instead *mutates*\n * the `amounts` array.\n */\n function _upscaleArray(uint256[] memory amounts, uint256[] memory scalingFactors) internal view {\n for (uint256 i = 0; i < _getTotalTokens(); ++i) {\n amounts[i] = Math.mul(amounts[i], scalingFactors[i]);\n }\n }\n\n /**\n * @dev Reverses the `scalingFactor` applied to `amount`, resulting in a smaller or equal value depending on\n * whether it needed scaling or not. The result is rounded down.\n */\n function _downscaleDown(uint256 amount, uint256 scalingFactor) internal pure returns (uint256) {\n return Math.divDown(amount, scalingFactor);\n }\n\n /**\n * @dev Same as `_downscaleDown`, but for an entire array. This function does not return anything, but instead\n * *mutates* the `amounts` array.\n */\n function _downscaleDownArray(uint256[] memory amounts, uint256[] memory scalingFactors) internal view {\n for (uint256 i = 0; i < _getTotalTokens(); ++i) {\n amounts[i] = Math.divDown(amounts[i], scalingFactors[i]);\n }\n }\n\n /**\n * @dev Reverses the `scalingFactor` applied to `amount`, resulting in a smaller or equal value depending on\n * whether it needed scaling or not. The result is rounded up.\n */\n function _downscaleUp(uint256 amount, uint256 scalingFactor) internal pure returns (uint256) {\n return Math.divUp(amount, scalingFactor);\n }\n\n /**\n * @dev Same as `_downscaleUp`, but for an entire array. This function does not return anything, but instead\n * *mutates* the `amounts` array.\n */\n function _downscaleUpArray(uint256[] memory amounts, uint256[] memory scalingFactors) internal view {\n for (uint256 i = 0; i < _getTotalTokens(); ++i) {\n amounts[i] = Math.divUp(amounts[i], scalingFactors[i]);\n }\n }\n\n function _getAuthorizer() internal view override returns (IAuthorizer) {\n // Access control management is delegated to the Vault's Authorizer. This lets Balancer Governance manage which\n // accounts can call permissioned functions: for example, to perform emergency pauses.\n // If the owner is delegated, then *all* permissioned functions, including `setSwapFeePercentage`, will be under\n // Governance control.\n return getVault().getAuthorizer();\n }\n\n function _queryAction(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData,\n function(bytes32, address, address, uint256[] memory, uint256, uint256, bytes memory)\n internal\n returns (uint256, uint256[] memory, uint256[] memory) _action,\n function(uint256[] memory, uint256[] memory) internal view _downscaleArray\n ) private {\n // This uses the same technique used by the Vault in queryBatchSwap. Refer to that function for a detailed\n // explanation.\n\n if (msg.sender != address(this)) {\n // We perform an external call to ourselves, forwarding the same calldata. In this call, the else clause of\n // the preceding if statement will be executed instead.\n\n // solhint-disable-next-line avoid-low-level-calls\n (bool success, ) = address(this).call(msg.data);\n\n // solhint-disable-next-line no-inline-assembly\n assembly {\n // This call should always revert to decode the bpt and token amounts from the revert reason\n switch success\n case 0 {\n // Note we are manually writing the memory slot 0. We can safely overwrite whatever is\n // stored there as we take full control of the execution and then immediately return.\n\n // We copy the first 4 bytes to check if it matches with the expected signature, otherwise\n // there was another revert reason and we should forward it.\n returndatacopy(0, 0, 0x04)\n let error := and(mload(0), 0xffffffff00000000000000000000000000000000000000000000000000000000)\n\n // If the first 4 bytes don't match with the expected signature, we forward the revert reason.\n if eq(eq(error, 0x43adbafb00000000000000000000000000000000000000000000000000000000), 0) {\n returndatacopy(0, 0, returndatasize())\n revert(0, returndatasize())\n }\n\n // The returndata contains the signature, followed by the raw memory representation of the\n // `bptAmount` and `tokenAmounts` (array: length + data). We need to return an ABI-encoded\n // representation of these.\n // An ABI-encoded response will include one additional field to indicate the starting offset of\n // the `tokenAmounts` array. The `bptAmount` will be laid out in the first word of the\n // returndata.\n //\n // In returndata:\n // [ signature ][ bptAmount ][ tokenAmounts length ][ tokenAmounts values ]\n // [ 4 bytes ][ 32 bytes ][ 32 bytes ][ (32 * length) bytes ]\n //\n // We now need to return (ABI-encoded values):\n // [ bptAmount ][ tokeAmounts offset ][ tokenAmounts length ][ tokenAmounts values ]\n // [ 32 bytes ][ 32 bytes ][ 32 bytes ][ (32 * length) bytes ]\n\n // We copy 32 bytes for the `bptAmount` from returndata into memory.\n // Note that we skip the first 4 bytes for the error signature\n returndatacopy(0, 0x04, 32)\n\n // The offsets are 32-bytes long, so the array of `tokenAmounts` will start after\n // the initial 64 bytes.\n mstore(0x20, 64)\n\n // We now copy the raw memory array for the `tokenAmounts` from returndata into memory.\n // Since bpt amount and offset take up 64 bytes, we start copying at address 0x40. We also\n // skip the first 36 bytes from returndata, which correspond to the signature plus bpt amount.\n returndatacopy(0x40, 0x24, sub(returndatasize(), 36))\n\n // We finally return the ABI-encoded uint256 and the array, which has a total length equal to\n // the size of returndata, plus the 32 bytes of the offset but without the 4 bytes of the\n // error signature.\n return(0, add(returndatasize(), 28))\n }\n default {\n // This call should always revert, but we fail nonetheless if that didn't happen\n invalid()\n }\n }\n } else {\n uint256[] memory scalingFactors = _scalingFactors();\n _upscaleArray(balances, scalingFactors);\n\n (uint256 bptAmount, uint256[] memory tokenAmounts, ) = _action(\n poolId,\n sender,\n recipient,\n balances,\n lastChangeBlock,\n protocolSwapFeePercentage,\n userData\n );\n\n _downscaleArray(tokenAmounts, scalingFactors);\n\n // solhint-disable-next-line no-inline-assembly\n assembly {\n // We will return a raw representation of `bptAmount` and `tokenAmounts` in memory, which is composed of\n // a 32-byte uint256, followed by a 32-byte for the array length, and finally the 32-byte uint256 values\n // Because revert expects a size in bytes, we multiply the array length (stored at `tokenAmounts`) by 32\n let size := mul(mload(tokenAmounts), 32)\n\n // We store the `bptAmount` in the previous slot to the `tokenAmounts` array. We can make sure there\n // will be at least one available slot due to how the memory scratch space works.\n // We can safely overwrite whatever is stored in this slot as we will revert immediately after that.\n let start := sub(tokenAmounts, 0x20)\n mstore(start, bptAmount)\n\n // We send one extra value for the error signature \"QueryError(uint256,uint256[])\" which is 0x43adbafb\n // We use the previous slot to `bptAmount`.\n mstore(sub(start, 0x20), 0x0000000000000000000000000000000000000000000000000000000043adbafb)\n start := sub(start, 0x04)\n\n // When copying from `tokenAmounts` into returndata, we copy the additional 68 bytes to also return\n // the `bptAmount`, the array 's length, and the error signature.\n revert(start, add(size, 68))\n }\n }\n }\n}\n" }, "contracts/vault/interfaces/IVault.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma experimental ABIEncoderV2;\n\nimport \"../../lib/openzeppelin/IERC20.sol\";\n\nimport \"./IWETH.sol\";\nimport \"./IAsset.sol\";\nimport \"./IAuthorizer.sol\";\nimport \"./IFlashLoanRecipient.sol\";\nimport \"../ProtocolFeesCollector.sol\";\n\nimport \"../../lib/helpers/ISignaturesValidator.sol\";\nimport \"../../lib/helpers/ITemporarilyPausable.sol\";\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Full external interface for the Vault core contract - no external or public methods exist in the contract that\n * don't override one of these declarations.\n */\ninterface IVault is ISignaturesValidator, ITemporarilyPausable {\n // Generalities about the Vault:\n //\n // - Whenever documentation refers to 'tokens', it strictly refers to ERC20-compliant token contracts. Tokens are\n // transferred out of the Vault by calling the `IERC20.transfer` function, and transferred in by calling\n // `IERC20.transferFrom`. In these cases, the sender must have previously allowed the Vault to use their tokens by\n // calling `IERC20.approve`. The only deviation from the ERC20 standard that is supported is functions not returning\n // a boolean value: in these scenarios, a non-reverting call is assumed to be successful.\n //\n // - All non-view functions in the Vault are non-reentrant: calling them while another one is mid-execution (e.g.\n // while execution control is transferred to a token contract during a swap) will result in a revert. View\n // functions can be called in a re-reentrant way, but doing so might cause them to return inconsistent results.\n // Contracts calling view functions in the Vault must make sure the Vault has not already been entered.\n //\n // - View functions revert if referring to either unregistered Pools, or unregistered tokens for registered Pools.\n\n // Authorizer\n //\n // Some system actions are permissioned, like setting and collecting protocol fees. This permissioning system exists\n // outside of the Vault in the Authorizer contract: the Vault simply calls the Authorizer to check if the caller\n // can perform a given action.\n\n /**\n * @dev Returns the Vault's Authorizer.\n */\n function getAuthorizer() external view returns (IAuthorizer);\n\n /**\n * @dev Sets a new Authorizer for the Vault. The caller must be allowed by the current Authorizer to do this.\n *\n * Emits an `AuthorizerChanged` event.\n */\n function setAuthorizer(IAuthorizer newAuthorizer) external;\n\n /**\n * @dev Emitted when a new authorizer is set by `setAuthorizer`.\n */\n event AuthorizerChanged(IAuthorizer indexed newAuthorizer);\n\n // Relayers\n //\n // Additionally, it is possible for an account to perform certain actions on behalf of another one, using their\n // Vault ERC20 allowance and Internal Balance. These accounts are said to be 'relayers' for these Vault functions,\n // and are expected to be smart contracts with sound authentication mechanisms. For an account to be able to wield\n // this power, two things must occur:\n // - The Authorizer must grant the account the permission to be a relayer for the relevant Vault function. This\n // means that Balancer governance must approve each individual contract to act as a relayer for the intended\n // functions.\n // - Each user must approve the relayer to act on their behalf.\n // This double protection means users cannot be tricked into approving malicious relayers (because they will not\n // have been allowed by the Authorizer via governance), nor can malicious relayers approved by a compromised\n // Authorizer or governance drain user funds, since they would also need to be approved by each individual user.\n\n /**\n * @dev Returns true if `user` has approved `relayer` to act as a relayer for them.\n */\n function hasApprovedRelayer(address user, address relayer) external view returns (bool);\n\n /**\n * @dev Allows `relayer` to act as a relayer for `sender` if `approved` is true, and disallows it otherwise.\n *\n * Emits a `RelayerApprovalChanged` event.\n */\n function setRelayerApproval(\n address sender,\n address relayer,\n bool approved\n ) external;\n\n /**\n * @dev Emitted every time a relayer is approved or disapproved by `setRelayerApproval`.\n */\n event RelayerApprovalChanged(address indexed relayer, address indexed sender, bool approved);\n\n // Internal Balance\n //\n // Users can deposit tokens into the Vault, where they are allocated to their Internal Balance, and later\n // transferred or withdrawn. It can also be used as a source of tokens when joining Pools, as a destination\n // when exiting them, and as either when performing swaps. This usage of Internal Balance results in greatly reduced\n // gas costs when compared to relying on plain ERC20 transfers, leading to large savings for frequent users.\n //\n // Internal Balance management features batching, which means a single contract call can be used to perform multiple\n // operations of different kinds, with different senders and recipients, at once.\n\n /**\n * @dev Returns `user`'s Internal Balance for a set of tokens.\n */\n function getInternalBalance(address user, IERC20[] memory tokens) external view returns (uint256[] memory);\n\n /**\n * @dev Performs a set of user balance operations, which involve Internal Balance (deposit, withdraw or transfer)\n * and plain ERC20 transfers using the Vault's allowance. This last feature is particularly useful for relayers, as\n * it lets integrators reuse a user's Vault allowance.\n *\n * For each operation, if the caller is not `sender`, it must be an authorized relayer for them.\n */\n function manageUserBalance(UserBalanceOp[] memory ops) external payable;\n\n /**\n * @dev Data for `manageUserBalance` operations, which include the possibility for ETH to be sent and received\n without manual WETH wrapping or unwrapping.\n */\n struct UserBalanceOp {\n UserBalanceOpKind kind;\n IAsset asset;\n uint256 amount;\n address sender;\n address payable recipient;\n }\n\n // There are four possible operations in `manageUserBalance`:\n //\n // - DEPOSIT_INTERNAL\n // Increases the Internal Balance of the `recipient` account by transferring tokens from the corresponding\n // `sender`. The sender must have allowed the Vault to use their tokens via `IERC20.approve()`.\n //\n // ETH can be used by passing the ETH sentinel value as the asset and forwarding ETH in the call: it will be wrapped\n // and deposited as WETH. Any ETH amount remaining will be sent back to the caller (not the sender, which is\n // relevant for relayers).\n //\n // Emits an `InternalBalanceChanged` event.\n //\n //\n // - WITHDRAW_INTERNAL\n // Decreases the Internal Balance of the `sender` account by transferring tokens to the `recipient`.\n //\n // ETH can be used by passing the ETH sentinel value as the asset. This will deduct WETH instead, unwrap it and send\n // it to the recipient as ETH.\n //\n // Emits an `InternalBalanceChanged` event.\n //\n //\n // - TRANSFER_INTERNAL\n // Transfers tokens from the Internal Balance of the `sender` account to the Internal Balance of `recipient`.\n //\n // Reverts if the ETH sentinel value is passed.\n //\n // Emits an `InternalBalanceChanged` event.\n //\n //\n // - TRANSFER_EXTERNAL\n // Transfers tokens from `sender` to `recipient`, using the Vault's ERC20 allowance. This is typically used by\n // relayers, as it lets them reuse a user's Vault allowance.\n //\n // Reverts if the ETH sentinel value is passed.\n //\n // Emits an `ExternalBalanceTransfer` event.\n\n enum UserBalanceOpKind { DEPOSIT_INTERNAL, WITHDRAW_INTERNAL, TRANSFER_INTERNAL, TRANSFER_EXTERNAL }\n\n /**\n * @dev Emitted when a user's Internal Balance changes, either from calls to `manageUserBalance`, or through\n * interacting with Pools using Internal Balance.\n *\n * Because Internal Balance works exclusively with ERC20 tokens, ETH deposits and withdrawals will use the WETH\n * address.\n */\n event InternalBalanceChanged(address indexed user, IERC20 indexed token, int256 delta);\n\n /**\n * @dev Emitted when a user's Vault ERC20 allowance is used by the Vault to transfer tokens to an external account.\n */\n event ExternalBalanceTransfer(IERC20 indexed token, address indexed sender, address recipient, uint256 amount);\n\n // Pools\n //\n // There are three specialization settings for Pools, which allow for cheaper swaps at the cost of reduced\n // functionality:\n //\n // - General: no specialization, suited for all Pools. IGeneralPool is used for swap request callbacks, passing the\n // balance of all tokens in the Pool. These Pools have the largest swap costs (because of the extra storage reads),\n // which increase with the number of registered tokens.\n //\n // - Minimal Swap Info: IMinimalSwapInfoPool is used instead of IGeneralPool, which saves gas by only passing the\n // balance of the two tokens involved in the swap. This is suitable for some pricing algorithms, like the weighted\n // constant product one popularized by Balancer V1. Swap costs are smaller compared to general Pools, and are\n // independent of the number of registered tokens.\n //\n // - Two Token: only allows two tokens to be registered. This achieves the lowest possible swap gas cost. Like\n // minimal swap info Pools, these are called via IMinimalSwapInfoPool.\n\n enum PoolSpecialization { GENERAL, MINIMAL_SWAP_INFO, TWO_TOKEN }\n\n /**\n * @dev Registers the caller account as a Pool with a given specialization setting. Returns the Pool's ID, which\n * is used in all Pool-related functions. Pools cannot be deregistered, nor can the Pool's specialization be\n * changed.\n *\n * The caller is expected to be a smart contract that implements either `IGeneralPool` or `IMinimalSwapInfoPool`,\n * depending on the chosen specialization setting. This contract is known as the Pool's contract.\n *\n * Note that the same contract may register itself as multiple Pools with unique Pool IDs, or in other words,\n * multiple Pools may share the same contract.\n *\n * Emits a `PoolRegistered` event.\n */\n function registerPool(PoolSpecialization specialization) external returns (bytes32);\n\n /**\n * @dev Emitted when a Pool is registered by calling `registerPool`.\n */\n event PoolRegistered(bytes32 indexed poolId, address indexed poolAddress, PoolSpecialization specialization);\n\n /**\n * @dev Returns a Pool's contract address and specialization setting.\n */\n function getPool(bytes32 poolId) external view returns (address, PoolSpecialization);\n\n /**\n * @dev Registers `tokens` for the `poolId` Pool. Must be called by the Pool's contract.\n *\n * Pools can only interact with tokens they have registered. Users join a Pool by transferring registered tokens,\n * exit by receiving registered tokens, and can only swap registered tokens.\n *\n * Each token can only be registered once. For Pools with the Two Token specialization, `tokens` must have a length\n * of two, that is, both tokens must be registered in the same `registerTokens` call, and they must be sorted in\n * ascending order.\n *\n * The `tokens` and `assetManagers` arrays must have the same length, and each entry in these indicates the Asset\n * Manager for the corresponding token. Asset Managers can manage a Pool's tokens via `managePoolBalance`,\n * depositing and withdrawing them directly, and can even set their balance to arbitrary amounts. They are therefore\n * expected to be highly secured smart contracts with sound design principles, and the decision to register an\n * Asset Manager should not be made lightly.\n *\n * Pools can choose not to assign an Asset Manager to a given token by passing in the zero address. Once an Asset\n * Manager is set, it cannot be changed except by deregistering the associated token and registering again with a\n * different Asset Manager.\n *\n * Emits a `TokensRegistered` event.\n */\n function registerTokens(\n bytes32 poolId,\n IERC20[] memory tokens,\n address[] memory assetManagers\n ) external;\n\n /**\n * @dev Emitted when a Pool registers tokens by calling `registerTokens`.\n */\n event TokensRegistered(bytes32 indexed poolId, IERC20[] tokens, address[] assetManagers);\n\n /**\n * @dev Deregisters `tokens` for the `poolId` Pool. Must be called by the Pool's contract.\n *\n * Only registered tokens (via `registerTokens`) can be deregistered. Additionally, they must have zero total\n * balance. For Pools with the Two Token specialization, `tokens` must have a length of two, that is, both tokens\n * must be deregistered in the same `deregisterTokens` call.\n *\n * A deregistered token can be re-registered later on, possibly with a different Asset Manager.\n *\n * Emits a `TokensDeregistered` event.\n */\n function deregisterTokens(bytes32 poolId, IERC20[] memory tokens) external;\n\n /**\n * @dev Emitted when a Pool deregisters tokens by calling `deregisterTokens`.\n */\n event TokensDeregistered(bytes32 indexed poolId, IERC20[] tokens);\n\n /**\n * @dev Returns detailed information for a Pool's registered token.\n *\n * `cash` is the number of tokens the Vault currently holds for the Pool. `managed` is the number of tokens\n * withdrawn and held outside the Vault by the Pool's token Asset Manager. The Pool's total balance for `token`\n * equals the sum of `cash` and `managed`.\n *\n * Internally, `cash` and `managed` are stored using 112 bits. No action can ever cause a Pool's token `cash`,\n * `managed` or `total` balance to be greater than 2^112 - 1.\n *\n * `lastChangeBlock` is the number of the block in which `token`'s total balance was last modified (via either a\n * join, exit, swap, or Asset Manager update). This value is useful to avoid so-called 'sandwich attacks', for\n * example when developing price oracles. A change of zero (e.g. caused by a swap with amount zero) is considered a\n * change for this purpose, and will update `lastChangeBlock`.\n *\n * `assetManager` is the Pool's token Asset Manager.\n */\n function getPoolTokenInfo(bytes32 poolId, IERC20 token)\n external\n view\n returns (\n uint256 cash,\n uint256 managed,\n uint256 lastChangeBlock,\n address assetManager\n );\n\n /**\n * @dev Returns a Pool's registered tokens, the total balance for each, and the latest block when *any* of\n * the tokens' `balances` changed.\n *\n * The order of the `tokens` array is the same order that will be used in `joinPool`, `exitPool`, as well as in all\n * Pool hooks (where applicable). Calls to `registerTokens` and `deregisterTokens` may change this order.\n *\n * If a Pool only registers tokens once, and these are sorted in ascending order, they will be stored in the same\n * order as passed to `registerTokens`.\n *\n * Total balances include both tokens held by the Vault and those withdrawn by the Pool's Asset Managers. These are\n * the amounts used by joins, exits and swaps. For a detailed breakdown of token balances, use `getPoolTokenInfo`\n * instead.\n */\n function getPoolTokens(bytes32 poolId)\n external\n view\n returns (\n IERC20[] memory tokens,\n uint256[] memory balances,\n uint256 lastChangeBlock\n );\n\n /**\n * @dev Called by users to join a Pool, which transfers tokens from `sender` into the Pool's balance. This will\n * trigger custom Pool behavior, which will typically grant something in return to `recipient` - often tokenized\n * Pool shares.\n *\n * If the caller is not `sender`, it must be an authorized relayer for them.\n *\n * The `assets` and `maxAmountsIn` arrays must have the same length, and each entry indicates the maximum amount\n * to send for each asset. The amounts to send are decided by the Pool and not the Vault: it just enforces\n * these maximums.\n *\n * If joining a Pool that holds WETH, it is possible to send ETH directly: the Vault will do the wrapping. To enable\n * this mechanism, the IAsset sentinel value (the zero address) must be passed in the `assets` array instead of the\n * WETH address. Note that it is not possible to combine ETH and WETH in the same join. Any excess ETH will be sent\n * back to the caller (not the sender, which is important for relayers).\n *\n * `assets` must have the same length and order as the array returned by `getPoolTokens`. This prevents issues when\n * interacting with Pools that register and deregister tokens frequently. If sending ETH however, the array must be\n * sorted *before* replacing the WETH address with the ETH sentinel value (the zero address), which means the final\n * `assets` array might not be sorted. Pools with no registered tokens cannot be joined.\n *\n * If `fromInternalBalance` is true, the caller's Internal Balance will be preferred: ERC20 transfers will only\n * be made for the difference between the requested amount and Internal Balance (if any). Note that ETH cannot be\n * withdrawn from Internal Balance: attempting to do so will trigger a revert.\n *\n * This causes the Vault to call the `IBasePool.onJoinPool` hook on the Pool's contract, where Pools implement\n * their own custom logic. This typically requires additional information from the user (such as the expected number\n * of Pool shares). This can be encoded in the `userData` argument, which is ignored by the Vault and passed\n * directly to the Pool's contract, as is `recipient`.\n *\n * Emits a `PoolBalanceChanged` event.\n */\n function joinPool(\n bytes32 poolId,\n address sender,\n address recipient,\n JoinPoolRequest memory request\n ) external payable;\n\n struct JoinPoolRequest {\n IAsset[] assets;\n uint256[] maxAmountsIn;\n bytes userData;\n bool fromInternalBalance;\n }\n\n /**\n * @dev Called by users to exit a Pool, which transfers tokens from the Pool's balance to `recipient`. This will\n * trigger custom Pool behavior, which will typically ask for something in return from `sender` - often tokenized\n * Pool shares. The amount of tokens that can be withdrawn is limited by the Pool's `cash` balance (see\n * `getPoolTokenInfo`).\n *\n * If the caller is not `sender`, it must be an authorized relayer for them.\n *\n * The `tokens` and `minAmountsOut` arrays must have the same length, and each entry in these indicates the minimum\n * token amount to receive for each token contract. The amounts to send are decided by the Pool and not the Vault:\n * it just enforces these minimums.\n *\n * If exiting a Pool that holds WETH, it is possible to receive ETH directly: the Vault will do the unwrapping. To\n * enable this mechanism, the IAsset sentinel value (the zero address) must be passed in the `assets` array instead\n * of the WETH address. Note that it is not possible to combine ETH and WETH in the same exit.\n *\n * `assets` must have the same length and order as the array returned by `getPoolTokens`. This prevents issues when\n * interacting with Pools that register and deregister tokens frequently. If receiving ETH however, the array must\n * be sorted *before* replacing the WETH address with the ETH sentinel value (the zero address), which means the\n * final `assets` array might not be sorted. Pools with no registered tokens cannot be exited.\n *\n * If `toInternalBalance` is true, the tokens will be deposited to `recipient`'s Internal Balance. Otherwise,\n * an ERC20 transfer will be performed. Note that ETH cannot be deposited to Internal Balance: attempting to\n * do so will trigger a revert.\n *\n * `minAmountsOut` is the minimum amount of tokens the user expects to get out of the Pool, for each token in the\n * `tokens` array. This array must match the Pool's registered tokens.\n *\n * This causes the Vault to call the `IBasePool.onExitPool` hook on the Pool's contract, where Pools implement\n * their own custom logic. This typically requires additional information from the user (such as the expected number\n * of Pool shares to return). This can be encoded in the `userData` argument, which is ignored by the Vault and\n * passed directly to the Pool's contract.\n *\n * Emits a `PoolBalanceChanged` event.\n */\n function exitPool(\n bytes32 poolId,\n address sender,\n address payable recipient,\n ExitPoolRequest memory request\n ) external;\n\n struct ExitPoolRequest {\n IAsset[] assets;\n uint256[] minAmountsOut;\n bytes userData;\n bool toInternalBalance;\n }\n\n /**\n * @dev Emitted when a user joins or exits a Pool by calling `joinPool` or `exitPool`, respectively.\n */\n event PoolBalanceChanged(\n bytes32 indexed poolId,\n address indexed liquidityProvider,\n IERC20[] tokens,\n int256[] deltas,\n uint256[] protocolFeeAmounts\n );\n\n enum PoolBalanceChangeKind { JOIN, EXIT }\n\n // Swaps\n //\n // Users can swap tokens with Pools by calling the `swap` and `batchSwap` functions. To do this,\n // they need not trust Pool contracts in any way: all security checks are made by the Vault. They must however be\n // aware of the Pools' pricing algorithms in order to estimate the prices Pools will quote.\n //\n // The `swap` function executes a single swap, while `batchSwap` can perform multiple swaps in sequence.\n // In each individual swap, tokens of one kind are sent from the sender to the Pool (this is the 'token in'),\n // and tokens of another kind are sent from the Pool to the recipient in exchange (this is the 'token out').\n // More complex swaps, such as one token in to multiple tokens out can be achieved by batching together\n // individual swaps.\n //\n // There are two swap kinds:\n // - 'given in' swaps, where the amount of tokens in (sent to the Pool) is known, and the Pool determines (via the\n // `onSwap` hook) the amount of tokens out (to send to the recipient).\n // - 'given out' swaps, where the amount of tokens out (received from the Pool) is known, and the Pool determines\n // (via the `onSwap` hook) the amount of tokens in (to receive from the sender).\n //\n // Additionally, it is possible to chain swaps using a placeholder input amount, which the Vault replaces with\n // the calculated output of the previous swap. If the previous swap was 'given in', this will be the calculated\n // tokenOut amount. If the previous swap was 'given out', it will use the calculated tokenIn amount. These extended\n // swaps are known as 'multihop' swaps, since they 'hop' through a number of intermediate tokens before arriving at\n // the final intended token.\n //\n // In all cases, tokens are only transferred in and out of the Vault (or withdrawn from and deposited into Internal\n // Balance) after all individual swaps have been completed, and the net token balance change computed. This makes\n // certain swap patterns, such as multihops, or swaps that interact with the same token pair in multiple Pools, cost\n // much less gas than they would otherwise.\n //\n // It also means that under certain conditions it is possible to perform arbitrage by swapping with multiple\n // Pools in a way that results in net token movement out of the Vault (profit), with no tokens being sent in (only\n // updating the Pool's internal accounting).\n //\n // To protect users from front-running or the market changing rapidly, they supply a list of 'limits' for each token\n // involved in the swap, where either the maximum number of tokens to send (by passing a positive value) or the\n // minimum amount of tokens to receive (by passing a negative value) is specified.\n //\n // Additionally, a 'deadline' timestamp can also be provided, forcing the swap to fail if it occurs after\n // this point in time (e.g. if the transaction failed to be included in a block promptly).\n //\n // If interacting with Pools that hold WETH, it is possible to both send and receive ETH directly: the Vault will do\n // the wrapping and unwrapping. To enable this mechanism, the IAsset sentinel value (the zero address) must be\n // passed in the `assets` array instead of the WETH address. Note that it is possible to combine ETH and WETH in the\n // same swap. Any excess ETH will be sent back to the caller (not the sender, which is relevant for relayers).\n //\n // Finally, Internal Balance can be used when either sending or receiving tokens.\n\n enum SwapKind { GIVEN_IN, GIVEN_OUT }\n\n /**\n * @dev Performs a swap with a single Pool.\n *\n * If the swap is 'given in' (the number of tokens to send to the Pool is known), it returns the amount of tokens\n * taken from the Pool, which must be greater than or equal to `limit`.\n *\n * If the swap is 'given out' (the number of tokens to take from the Pool is known), it returns the amount of tokens\n * sent to the Pool, which must be less than or equal to `limit`.\n *\n * Internal Balance usage and the recipient are determined by the `funds` struct.\n *\n * Emits a `Swap` event.\n */\n function swap(\n SingleSwap memory singleSwap,\n FundManagement memory funds,\n uint256 limit,\n uint256 deadline\n ) external payable returns (uint256);\n\n /**\n * @dev Data for a single swap executed by `swap`. `amount` is either `amountIn` or `amountOut` depending on\n * the `kind` value.\n *\n * `assetIn` and `assetOut` are either token addresses, or the IAsset sentinel value for ETH (the zero address).\n * Note that Pools never interact with ETH directly: it will be wrapped to or unwrapped from WETH by the Vault.\n *\n * The `userData` field is ignored by the Vault, but forwarded to the Pool in the `onSwap` hook, and may be\n * used to extend swap behavior.\n */\n struct SingleSwap {\n bytes32 poolId;\n SwapKind kind;\n IAsset assetIn;\n IAsset assetOut;\n uint256 amount;\n bytes userData;\n }\n\n /**\n * @dev Performs a series of swaps with one or multiple Pools. In each individual swap, the caller determines either\n * the amount of tokens sent to or received from the Pool, depending on the `kind` value.\n *\n * Returns an array with the net Vault asset balance deltas. Positive amounts represent tokens (or ETH) sent to the\n * Vault, and negative amounts represent tokens (or ETH) sent by the Vault. Each delta corresponds to the asset at\n * the same index in the `assets` array.\n *\n * Swaps are executed sequentially, in the order specified by the `swaps` array. Each array element describes a\n * Pool, the token to be sent to this Pool, the token to receive from it, and an amount that is either `amountIn` or\n * `amountOut` depending on the swap kind.\n *\n * Multihop swaps can be executed by passing an `amount` value of zero for a swap. This will cause the amount in/out\n * of the previous swap to be used as the amount in for the current one. In a 'given in' swap, 'tokenIn' must equal\n * the previous swap's `tokenOut`. For a 'given out' swap, `tokenOut` must equal the previous swap's `tokenIn`.\n *\n * The `assets` array contains the addresses of all assets involved in the swaps. These are either token addresses,\n * or the IAsset sentinel value for ETH (the zero address). Each entry in the `swaps` array specifies tokens in and\n * out by referencing an index in `assets`. Note that Pools never interact with ETH directly: it will be wrapped to\n * or unwrapped from WETH by the Vault.\n *\n * Internal Balance usage, sender, and recipient are determined by the `funds` struct. The `limits` array specifies\n * the minimum or maximum amount of each token the vault is allowed to transfer.\n *\n * `batchSwap` can be used to make a single swap, like `swap` does, but doing so requires more gas than the\n * equivalent `swap` call.\n *\n * Emits `Swap` events.\n */\n function batchSwap(\n SwapKind kind,\n BatchSwapStep[] memory swaps,\n IAsset[] memory assets,\n FundManagement memory funds,\n int256[] memory limits,\n uint256 deadline\n ) external payable returns (int256[] memory);\n\n /**\n * @dev Data for each individual swap executed by `batchSwap`. The asset in and out fields are indexes into the\n * `assets` array passed to that function, and ETH assets are converted to WETH.\n *\n * If `amount` is zero, the multihop mechanism is used to determine the actual amount based on the amount in/out\n * from the previous swap, depending on the swap kind.\n *\n * The `userData` field is ignored by the Vault, but forwarded to the Pool in the `onSwap` hook, and may be\n * used to extend swap behavior.\n */\n struct BatchSwapStep {\n bytes32 poolId;\n uint256 assetInIndex;\n uint256 assetOutIndex;\n uint256 amount;\n bytes userData;\n }\n\n /**\n * @dev Emitted for each individual swap performed by `swap` or `batchSwap`.\n */\n event Swap(\n bytes32 indexed poolId,\n IERC20 indexed tokenIn,\n IERC20 indexed tokenOut,\n uint256 amountIn,\n uint256 amountOut\n );\n\n /**\n * @dev All tokens in a swap are either sent from the `sender` account to the Vault, or from the Vault to the\n * `recipient` account.\n *\n * If the caller is not `sender`, it must be an authorized relayer for them.\n *\n * If `fromInternalBalance` is true, the `sender`'s Internal Balance will be preferred, performing an ERC20\n * transfer for the difference between the requested amount and the User's Internal Balance (if any). The `sender`\n * must have allowed the Vault to use their tokens via `IERC20.approve()`. This matches the behavior of\n * `joinPool`.\n *\n * If `toInternalBalance` is true, tokens will be deposited to `recipient`'s internal balance instead of\n * transferred. This matches the behavior of `exitPool`.\n *\n * Note that ETH cannot be deposited to or withdrawn from Internal Balance: attempting to do so will trigger a\n * revert.\n */\n struct FundManagement {\n address sender;\n bool fromInternalBalance;\n address payable recipient;\n bool toInternalBalance;\n }\n\n /**\n * @dev Simulates a call to `batchSwap`, returning an array of Vault asset deltas. Calls to `swap` cannot be\n * simulated directly, but an equivalent `batchSwap` call can and will yield the exact same result.\n *\n * Each element in the array corresponds to the asset at the same index, and indicates the number of tokens (or ETH)\n * the Vault would take from the sender (if positive) or send to the recipient (if negative). The arguments it\n * receives are the same that an equivalent `batchSwap` call would receive.\n *\n * Unlike `batchSwap`, this function performs no checks on the sender or recipient field in the `funds` struct.\n * This makes it suitable to be called by off-chain applications via eth_call without needing to hold tokens,\n * approve them for the Vault, or even know a user's address.\n *\n * Note that this function is not 'view' (due to implementation details): the client code must explicitly execute\n * eth_call instead of eth_sendTransaction.\n */\n function queryBatchSwap(\n SwapKind kind,\n BatchSwapStep[] memory swaps,\n IAsset[] memory assets,\n FundManagement memory funds\n ) external returns (int256[] memory assetDeltas);\n\n // Flash Loans\n\n /**\n * @dev Performs a 'flash loan', sending tokens to `recipient`, executing the `receiveFlashLoan` hook on it,\n * and then reverting unless the tokens plus a proportional protocol fee have been returned.\n *\n * The `tokens` and `amounts` arrays must have the same length, and each entry in these indicates the loan amount\n * for each token contract. `tokens` must be sorted in ascending order.\n *\n * The 'userData' field is ignored by the Vault, and forwarded as-is to `recipient` as part of the\n * `receiveFlashLoan` call.\n *\n * Emits `FlashLoan` events.\n */\n function flashLoan(\n IFlashLoanRecipient recipient,\n IERC20[] memory tokens,\n uint256[] memory amounts,\n bytes memory userData\n ) external;\n\n /**\n * @dev Emitted for each individual flash loan performed by `flashLoan`.\n */\n event FlashLoan(IFlashLoanRecipient indexed recipient, IERC20 indexed token, uint256 amount, uint256 feeAmount);\n\n // Asset Management\n //\n // Each token registered for a Pool can be assigned an Asset Manager, which is able to freely withdraw the Pool's\n // tokens from the Vault, deposit them, or assign arbitrary values to its `managed` balance (see\n // `getPoolTokenInfo`). This makes them extremely powerful and dangerous. Even if an Asset Manager only directly\n // controls one of the tokens in a Pool, a malicious manager could set that token's balance to manipulate the\n // prices of the other tokens, and then drain the Pool with swaps. The risk of using Asset Managers is therefore\n // not constrained to the tokens they are managing, but extends to the entire Pool's holdings.\n //\n // However, a properly designed Asset Manager smart contract can be safely used for the Pool's benefit,\n // for example by lending unused tokens out for interest, or using them to participate in voting protocols.\n //\n // This concept is unrelated to the IAsset interface.\n\n /**\n * @dev Performs a set of Pool balance operations, which may be either withdrawals, deposits or updates.\n *\n * Pool Balance management features batching, which means a single contract call can be used to perform multiple\n * operations of different kinds, with different Pools and tokens, at once.\n *\n * For each operation, the caller must be registered as the Asset Manager for `token` in `poolId`.\n */\n function managePoolBalance(PoolBalanceOp[] memory ops) external;\n\n struct PoolBalanceOp {\n PoolBalanceOpKind kind;\n bytes32 poolId;\n IERC20 token;\n uint256 amount;\n }\n\n /**\n * Withdrawals decrease the Pool's cash, but increase its managed balance, leaving the total balance unchanged.\n *\n * Deposits increase the Pool's cash, but decrease its managed balance, leaving the total balance unchanged.\n *\n * Updates don't affect the Pool's cash balance, but because the managed balance changes, it does alter the total.\n * The external amount can be either increased or decreased by this call (i.e., reporting a gain or a loss).\n */\n enum PoolBalanceOpKind { WITHDRAW, DEPOSIT, UPDATE }\n\n /**\n * @dev Emitted when a Pool's token Asset Manager alters its balance via `managePoolBalance`.\n */\n event PoolBalanceManaged(\n bytes32 indexed poolId,\n address indexed assetManager,\n IERC20 indexed token,\n int256 cashDelta,\n int256 managedDelta\n );\n\n // Protocol Fees\n //\n // Some operations cause the Vault to collect tokens in the form of protocol fees, which can then be withdrawn by\n // permissioned accounts.\n //\n // There are two kinds of protocol fees:\n //\n // - flash loan fees: charged on all flash loans, as a percentage of the amounts lent.\n //\n // - swap fees: a percentage of the fees charged by Pools when performing swaps. For a number of reasons, including\n // swap gas costs and interface simplicity, protocol swap fees are not charged on each individual swap. Rather,\n // Pools are expected to keep track of how much they have charged in swap fees, and pay any outstanding debts to the\n // Vault when they are joined or exited. This prevents users from joining a Pool with unpaid debt, as well as\n // exiting a Pool in debt without first paying their share.\n\n /**\n * @dev Returns the current protocol fee module.\n */\n function getProtocolFeesCollector() external view returns (ProtocolFeesCollector);\n\n /**\n * @dev Safety mechanism to pause most Vault operations in the event of an emergency - typically detection of an\n * error in some part of the system.\n *\n * The Vault can only be paused during an initial time period, after which pausing is forever disabled.\n *\n * While the contract is paused, the following features are disabled:\n * - depositing and transferring internal balance\n * - transferring external balance (using the Vault's allowance)\n * - swaps\n * - joining Pools\n * - Asset Manager interactions\n *\n * Internal Balance can still be withdrawn, and Pools exited.\n */\n function setPaused(bool paused) external;\n\n /**\n * @dev Returns the Vault's WETH instance.\n */\n function WETH() external view returns (IWETH);\n // solhint-disable-previous-line func-name-mixedcase\n}\n" }, "contracts/vault/interfaces/IBasePool.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"./IVault.sol\";\nimport \"./IPoolSwapStructs.sol\";\n\n/**\n * @dev Interface for adding and removing liquidity that all Pool contracts should implement. Note that this is not\n * the complete Pool contract interface, as it is missing the swap hooks. Pool contracts should also inherit from\n * either IGeneralPool or IMinimalSwapInfoPool\n */\ninterface IBasePool is IPoolSwapStructs {\n /**\n * @dev Called by the Vault when a user calls `IVault.joinPool` to add liquidity to this Pool. Returns how many of\n * each registered token the user should provide, as well as the amount of protocol fees the Pool owes to the Vault.\n * The Vault will then take tokens from `sender` and add them to the Pool's balances, as well as collect\n * the reported amount in protocol fees, which the pool should calculate based on `protocolSwapFeePercentage`.\n *\n * Protocol fees are reported and charged on join events so that the Pool is free of debt whenever new users join.\n *\n * `sender` is the account performing the join (from which tokens will be withdrawn), and `recipient` is the account\n * designated to receive any benefits (typically pool shares). `currentBalances` contains the total balances\n * for each token the Pool registered in the Vault, in the same order that `IVault.getPoolTokens` would return.\n *\n * `lastChangeBlock` is the last block in which *any* of the Pool's registered tokens last changed its total\n * balance.\n *\n * `userData` contains any pool-specific instructions needed to perform the calculations, such as the type of\n * join (e.g., proportional given an amount of pool shares, single-asset, multi-asset, etc.)\n *\n * Contracts implementing this function should check that the caller is indeed the Vault before performing any\n * state-changing operations, such as minting pool shares.\n */\n function onJoinPool(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n ) external returns (uint256[] memory amountsIn, uint256[] memory dueProtocolFeeAmounts);\n\n /**\n * @dev Called by the Vault when a user calls `IVault.exitPool` to remove liquidity from this Pool. Returns how many\n * tokens the Vault should deduct from the Pool's balances, as well as the amount of protocol fees the Pool owes\n * to the Vault. The Vault will then take tokens from the Pool's balances and send them to `recipient`,\n * as well as collect the reported amount in protocol fees, which the Pool should calculate based on\n * `protocolSwapFeePercentage`.\n *\n * Protocol fees are charged on exit events to guarantee that users exiting the Pool have paid their share.\n *\n * `sender` is the account performing the exit (typically the pool shareholder), and `recipient` is the account\n * to which the Vault will send the proceeds. `currentBalances` contains the total token balances for each token\n * the Pool registered in the Vault, in the same order that `IVault.getPoolTokens` would return.\n *\n * `lastChangeBlock` is the last block in which *any* of the Pool's registered tokens last changed its total\n * balance.\n *\n * `userData` contains any pool-specific instructions needed to perform the calculations, such as the type of\n * exit (e.g., proportional given an amount of pool shares, single-asset, multi-asset, etc.)\n *\n * Contracts implementing this function should check that the caller is indeed the Vault before performing any\n * state-changing operations, such as burning pool shares.\n */\n function onExitPool(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n ) external returns (uint256[] memory amountsOut, uint256[] memory dueProtocolFeeAmounts);\n}\n" }, "contracts/lib/openzeppelin/IERC20Permit.sol": { "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in\n * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].\n *\n * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by\n * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't\n * need to send a transaction, and thus is not required to hold Ether at all.\n */\ninterface IERC20Permit {\n /**\n * @dev Sets `value` as the allowance of `spender` over `owner`'s tokens,\n * given `owner`'s signed approval.\n *\n * IMPORTANT: The same issues {IERC20-approve} has related to transaction\n * ordering also apply here.\n *\n * Emits an {Approval} event.\n *\n * Requirements:\n *\n * - `spender` cannot be the zero address.\n * - `deadline` must be a timestamp in the future.\n * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`\n * over the EIP712-formatted function arguments.\n * - the signature must use ``owner``'s current nonce (see {nonces}).\n *\n * For more information on the signature format, see the\n * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP\n * section].\n */\n function permit(\n address owner,\n address spender,\n uint256 value,\n uint256 deadline,\n uint8 v,\n bytes32 r,\n bytes32 s\n ) external;\n\n /**\n * @dev Returns the current nonce for `owner`. This value must be\n * included whenever a signature is generated for {permit}.\n *\n * Every successful call to {permit} increases ``owner``'s nonce by one. This\n * prevents a signature from being used multiple times.\n */\n function nonces(address owner) external view returns (uint256);\n\n /**\n * @dev Returns the domain separator used in the encoding of the signature for `permit`, as defined by {EIP712}.\n */\n // solhint-disable-next-line func-name-mixedcase\n function DOMAIN_SEPARATOR() external view returns (bytes32);\n}\n" }, "contracts/lib/openzeppelin/EIP712.sol": { "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.\n *\n * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,\n * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding\n * they need in their contracts using a combination of `abi.encode` and `keccak256`.\n *\n * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding\n * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA\n * ({_hashTypedDataV4}).\n *\n * The implementation of the domain separator was designed to be as efficient as possible while still properly updating\n * the chain id to protect against replay attacks on an eventual fork of the chain.\n *\n * NOTE: This contract implements the version of the encoding known as \"v4\", as implemented by the JSON RPC method\n * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].\n *\n * _Available since v3.4._\n */\nabstract contract EIP712 {\n /* solhint-disable var-name-mixedcase */\n bytes32 private immutable _HASHED_NAME;\n bytes32 private immutable _HASHED_VERSION;\n bytes32 private immutable _TYPE_HASH;\n\n /* solhint-enable var-name-mixedcase */\n\n /**\n * @dev Initializes the domain separator and parameter caches.\n *\n * The meaning of `name` and `version` is specified in\n * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:\n *\n * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.\n * - `version`: the current major version of the signing domain.\n *\n * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart\n * contract upgrade].\n */\n constructor(string memory name, string memory version) {\n _HASHED_NAME = keccak256(bytes(name));\n _HASHED_VERSION = keccak256(bytes(version));\n _TYPE_HASH = keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\");\n }\n\n /**\n * @dev Returns the domain separator for the current chain.\n */\n function _domainSeparatorV4() internal view virtual returns (bytes32) {\n return keccak256(abi.encode(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION, _getChainId(), address(this)));\n }\n\n /**\n * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this\n * function returns the hash of the fully encoded EIP712 message for this domain.\n *\n * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:\n *\n * ```solidity\n * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(\n * keccak256(\"Mail(address to,string contents)\"),\n * mailTo,\n * keccak256(bytes(mailContents))\n * )));\n * address signer = ECDSA.recover(digest, signature);\n * ```\n */\n function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {\n return keccak256(abi.encodePacked(\"\\x19\\x01\", _domainSeparatorV4(), structHash));\n }\n\n function _getChainId() private view returns (uint256 chainId) {\n // Silence state mutability warning without generating bytecode.\n // See https://github.com/ethereum/solidity/issues/10090#issuecomment-741789128 and\n // https://github.com/ethereum/solidity/issues/2691\n this;\n\n // solhint-disable-next-line no-inline-assembly\n assembly {\n chainId := chainid()\n }\n }\n}\n" }, "contracts/lib/helpers/Authentication.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\nimport \"./BalancerErrors.sol\";\nimport \"./IAuthentication.sol\";\n\n/**\n * @dev Building block for performing access control on external functions.\n *\n * This contract is used via the `authenticate` modifier (or the `_authenticateCaller` function), which can be applied\n * to external functions to only make them callable by authorized accounts.\n *\n * Derived contracts must implement the `_canPerform` function, which holds the actual access control logic.\n */\nabstract contract Authentication is IAuthentication {\n bytes32 private immutable _actionIdDisambiguator;\n\n /**\n * @dev The main purpose of the `actionIdDisambiguator` is to prevent accidental function selector collisions in\n * multi contract systems.\n *\n * There are two main uses for it:\n * - if the contract is a singleton, any unique identifier can be used to make the associated action identifiers\n * unique. The contract's own address is a good option.\n * - if the contract belongs to a family that shares action identifiers for the same functions, an identifier\n * shared by the entire family (and no other contract) should be used instead.\n */\n constructor(bytes32 actionIdDisambiguator) {\n _actionIdDisambiguator = actionIdDisambiguator;\n }\n\n /**\n * @dev Reverts unless the caller is allowed to call this function. Should only be applied to external functions.\n */\n modifier authenticate() {\n _authenticateCaller();\n _;\n }\n\n /**\n * @dev Reverts unless the caller is allowed to call the entry point function.\n */\n function _authenticateCaller() internal view {\n bytes32 actionId = getActionId(msg.sig);\n _require(_canPerform(actionId, msg.sender), Errors.SENDER_NOT_ALLOWED);\n }\n\n function getActionId(bytes4 selector) public view override returns (bytes32) {\n // Each external function is dynamically assigned an action identifier as the hash of the disambiguator and the\n // function selector. Disambiguation is necessary to avoid potential collisions in the function selectors of\n // multiple contracts.\n return keccak256(abi.encodePacked(_actionIdDisambiguator, selector));\n }\n\n function _canPerform(bytes32 actionId, address user) internal view virtual returns (bool);\n}\n" }, "contracts/vault/interfaces/IAuthorizer.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\ninterface IAuthorizer {\n /**\n * @dev Returns true if `account` can perform the action described by `actionId` in the contract `where`.\n */\n function canPerform(\n bytes32 actionId,\n address account,\n address where\n ) external view returns (bool);\n}\n" }, "contracts/lib/helpers/IAuthentication.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\ninterface IAuthentication {\n /**\n * @dev Returns the action identifier associated with the external function described by `selector`.\n */\n function getActionId(bytes4 selector) external view returns (bytes32);\n}\n" }, "contracts/vault/interfaces/IWETH.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\nimport \"../../lib/openzeppelin/IERC20.sol\";\n\n/**\n * @dev Interface for the WETH token contract used internally for wrapping and unwrapping, to support\n * sending and receiving ETH in joins, swaps, and internal balance deposits and withdrawals.\n */\ninterface IWETH is IERC20 {\n function deposit() external payable;\n\n function withdraw(uint256 amount) external;\n}\n" }, "contracts/vault/interfaces/IFlashLoanRecipient.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\n// Inspired by Aave Protocol's IFlashLoanReceiver.\n\nimport \"../../lib/openzeppelin/IERC20.sol\";\n\ninterface IFlashLoanRecipient {\n /**\n * @dev When `flashLoan` is called on the Vault, it invokes the `receiveFlashLoan` hook on the recipient.\n *\n * At the time of the call, the Vault will have transferred `amounts` for `tokens` to the recipient. Before this\n * call returns, the recipient must have transferred `amounts` plus `feeAmounts` for each token back to the\n * Vault, or else the entire flash loan will revert.\n *\n * `userData` is the same value passed in the `IVault.flashLoan` call.\n */\n function receiveFlashLoan(\n IERC20[] memory tokens,\n uint256[] memory amounts,\n uint256[] memory feeAmounts,\n bytes memory userData\n ) external;\n}\n" }, "contracts/vault/ProtocolFeesCollector.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../lib/openzeppelin/IERC20.sol\";\nimport \"../lib/helpers/InputHelpers.sol\";\nimport \"../lib/helpers/Authentication.sol\";\nimport \"../lib/openzeppelin/ReentrancyGuard.sol\";\nimport \"../lib/openzeppelin/SafeERC20.sol\";\n\nimport \"./interfaces/IVault.sol\";\nimport \"./interfaces/IAuthorizer.sol\";\n\n/**\n * @dev This an auxiliary contract to the Vault, deployed by it during construction. It offloads some of the tasks the\n * Vault performs to reduce its overall bytecode size.\n *\n * The current values for all protocol fee percentages are stored here, and any tokens charged as protocol fees are\n * sent to this contract, where they may be withdrawn by authorized entities. All authorization tasks are delegated\n * to the Vault's own authorizer.\n */\ncontract ProtocolFeesCollector is Authentication, ReentrancyGuard {\n using SafeERC20 for IERC20;\n\n // Absolute maximum fee percentages (1e18 = 100%, 1e16 = 1%).\n uint256 private constant _MAX_PROTOCOL_SWAP_FEE_PERCENTAGE = 50e16; // 50%\n uint256 private constant _MAX_PROTOCOL_FLASH_LOAN_FEE_PERCENTAGE = 1e16; // 1%\n\n IVault public immutable vault;\n\n // All fee percentages are 18-decimal fixed point numbers.\n\n // The swap fee is charged whenever a swap occurs, as a percentage of the fee charged by the Pool. These are not\n // actually charged on each individual swap: the `Vault` relies on the Pools being honest and reporting fees due\n // when users join and exit them.\n uint256 private _swapFeePercentage;\n\n // The flash loan fee is charged whenever a flash loan occurs, as a percentage of the tokens lent.\n uint256 private _flashLoanFeePercentage;\n\n event SwapFeePercentageChanged(uint256 newSwapFeePercentage);\n event FlashLoanFeePercentageChanged(uint256 newFlashLoanFeePercentage);\n\n constructor(IVault _vault)\n // The ProtocolFeesCollector is a singleton, so it simply uses its own address to disambiguate action\n // identifiers.\n Authentication(bytes32(uint256(address(this))))\n {\n vault = _vault;\n }\n\n function withdrawCollectedFees(\n IERC20[] calldata tokens,\n uint256[] calldata amounts,\n address recipient\n ) external nonReentrant authenticate {\n InputHelpers.ensureInputLengthMatch(tokens.length, amounts.length);\n\n for (uint256 i = 0; i < tokens.length; ++i) {\n IERC20 token = tokens[i];\n uint256 amount = amounts[i];\n token.safeTransfer(recipient, amount);\n }\n }\n\n function setSwapFeePercentage(uint256 newSwapFeePercentage) external authenticate {\n _require(newSwapFeePercentage <= _MAX_PROTOCOL_SWAP_FEE_PERCENTAGE, Errors.SWAP_FEE_PERCENTAGE_TOO_HIGH);\n _swapFeePercentage = newSwapFeePercentage;\n emit SwapFeePercentageChanged(newSwapFeePercentage);\n }\n\n function setFlashLoanFeePercentage(uint256 newFlashLoanFeePercentage) external authenticate {\n _require(\n newFlashLoanFeePercentage <= _MAX_PROTOCOL_FLASH_LOAN_FEE_PERCENTAGE,\n Errors.FLASH_LOAN_FEE_PERCENTAGE_TOO_HIGH\n );\n _flashLoanFeePercentage = newFlashLoanFeePercentage;\n emit FlashLoanFeePercentageChanged(newFlashLoanFeePercentage);\n }\n\n function getSwapFeePercentage() external view returns (uint256) {\n return _swapFeePercentage;\n }\n\n function getFlashLoanFeePercentage() external view returns (uint256) {\n return _flashLoanFeePercentage;\n }\n\n function getCollectedFeeAmounts(IERC20[] memory tokens) external view returns (uint256[] memory feeAmounts) {\n feeAmounts = new uint256[](tokens.length);\n for (uint256 i = 0; i < tokens.length; ++i) {\n feeAmounts[i] = tokens[i].balanceOf(address(this));\n }\n }\n\n function getAuthorizer() external view returns (IAuthorizer) {\n return _getAuthorizer();\n }\n\n function _canPerform(bytes32 actionId, address account) internal view override returns (bool) {\n return _getAuthorizer().canPerform(actionId, account, address(this));\n }\n\n function _getAuthorizer() internal view returns (IAuthorizer) {\n return vault.getAuthorizer();\n }\n}\n" }, "contracts/lib/helpers/ISignaturesValidator.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Interface for the SignatureValidator helper, used to support meta-transactions.\n */\ninterface ISignaturesValidator {\n /**\n * @dev Returns the EIP712 domain separator.\n */\n function getDomainSeparator() external view returns (bytes32);\n\n /**\n * @dev Returns the next nonce used by an address to sign messages.\n */\n function getNextNonce(address user) external view returns (uint256);\n}\n" }, "contracts/lib/openzeppelin/ReentrancyGuard.sol": { "content": "// SPDX-License-Identifier: MIT\n\n// Based on the ReentrancyGuard library from OpenZeppelin Contracts, altered to reduce bytecode size.\n// Modifier code is inlined by the compiler, which causes its code to appear multiple times in the codebase. By using\n// private functions, we achieve the same end result with slightly higher runtime gas costs, but reduced bytecode size.\n\npragma solidity ^0.7.0;\n\nimport \"../helpers/BalancerErrors.sol\";\n\n/**\n * @dev Contract module that helps prevent reentrant calls to a function.\n *\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\n * available, which can be applied to functions to make sure there are no nested\n * (reentrant) calls to them.\n *\n * Note that because there is a single `nonReentrant` guard, functions marked as\n * `nonReentrant` may not call one another. This can be worked around by making\n * those functions `private`, and then adding `external` `nonReentrant` entry\n * points to them.\n *\n * TIP: If you would like to learn more about reentrancy and alternative ways\n * to protect against it, check out our blog post\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n */\nabstract contract ReentrancyGuard {\n // Booleans are more expensive than uint256 or any type that takes up a full\n // word because each write operation emits an extra SLOAD to first read the\n // slot's contents, replace the bits taken up by the boolean, and then write\n // back. This is the compiler's defense against contract upgrades and\n // pointer aliasing, and it cannot be disabled.\n\n // The values being non-zero value makes deployment a bit more expensive,\n // but in exchange the refund on every call to nonReentrant will be lower in\n // amount. Since refunds are capped to a percentage of the total\n // transaction's gas, it is best to keep them low in cases like this one, to\n // increase the likelihood of the full refund coming into effect.\n uint256 private constant _NOT_ENTERED = 1;\n uint256 private constant _ENTERED = 2;\n\n uint256 private _status;\n\n constructor() {\n _status = _NOT_ENTERED;\n }\n\n /**\n * @dev Prevents a contract from calling itself, directly or indirectly.\n * Calling a `nonReentrant` function from another `nonReentrant`\n * function is not supported. It is possible to prevent this from happening\n * by making the `nonReentrant` function external, and make it call a\n * `private` function that does the actual work.\n */\n modifier nonReentrant() {\n _enterNonReentrant();\n _;\n _exitNonReentrant();\n }\n\n function _enterNonReentrant() private {\n // On the first call to nonReentrant, _status will be _NOT_ENTERED\n _require(_status != _ENTERED, Errors.REENTRANCY);\n\n // Any calls to nonReentrant after this point will fail\n _status = _ENTERED;\n }\n\n function _exitNonReentrant() private {\n // By storing the original value once again, a refund is triggered (see\n // https://eips.ethereum.org/EIPS/eip-2200)\n _status = _NOT_ENTERED;\n }\n}\n" }, "contracts/lib/openzeppelin/SafeERC20.sol": { "content": "// SPDX-License-Identifier: MIT\n\n// Based on the ReentrancyGuard library from OpenZeppelin Contracts, altered to reduce gas costs.\n// The `safeTransfer` and `safeTransferFrom` functions assume that `token` is a contract (an account with code), and\n// work differently from the OpenZeppelin version if it is not.\n\npragma solidity ^0.7.0;\n\nimport \"../helpers/BalancerErrors.sol\";\n\nimport \"./IERC20.sol\";\n\n/**\n * @title SafeERC20\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\n * contract returns false). Tokens that return no value (and instead revert or\n * throw on failure) are also supported, non-reverting calls are assumed to be\n * successful.\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\n */\nlibrary SafeERC20 {\n function safeTransfer(\n IERC20 token,\n address to,\n uint256 value\n ) internal {\n _callOptionalReturn(address(token), abi.encodeWithSelector(token.transfer.selector, to, value));\n }\n\n function safeTransferFrom(\n IERC20 token,\n address from,\n address to,\n uint256 value\n ) internal {\n _callOptionalReturn(address(token), abi.encodeWithSelector(token.transferFrom.selector, from, to, value));\n }\n\n /**\n * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\n * on the return value: the return value is optional (but if data is returned, it must not be false).\n *\n * WARNING: `token` is assumed to be a contract: calls to EOAs will *not* revert.\n */\n function _callOptionalReturn(address token, bytes memory data) private {\n // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\n // we're implementing it ourselves.\n (bool success, bytes memory returndata) = token.call(data);\n\n // If the low-level call didn't succeed we return whatever was returned from it.\n assembly {\n if eq(success, 0) {\n returndatacopy(0, 0, returndatasize())\n revert(0, returndatasize())\n }\n }\n\n // Finally we check the returndata size is either zero or true - note that this check will always pass for EOAs\n _require(returndata.length == 0 || abi.decode(returndata, (bool)), Errors.SAFE_ERC20_CALL_FAILED);\n }\n}\n" }, "contracts/vault/interfaces/IPoolSwapStructs.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../../lib/openzeppelin/IERC20.sol\";\n\nimport \"./IVault.sol\";\n\ninterface IPoolSwapStructs {\n // This is not really an interface - it just defines common structs used by other interfaces: IGeneralPool and\n // IMinimalSwapInfoPool.\n //\n // This data structure represents a request for a token swap, where `kind` indicates the swap type ('given in' or\n // 'given out') which indicates whether or not the amount sent by the pool is known.\n //\n // The pool receives `tokenIn` and sends `tokenOut`. `amount` is the number of `tokenIn` tokens the pool will take\n // in, or the number of `tokenOut` tokens the Pool will send out, depending on the given swap `kind`.\n //\n // All other fields are not strictly necessary for most swaps, but are provided to support advanced scenarios in\n // some Pools.\n //\n // `poolId` is the ID of the Pool involved in the swap - this is useful for Pool contracts that implement more than\n // one Pool.\n //\n // The meaning of `lastChangeBlock` depends on the Pool specialization:\n // - Two Token or Minimal Swap Info: the last block in which either `tokenIn` or `tokenOut` changed its total\n // balance.\n // - General: the last block in which *any* of the Pool's registered tokens changed its total balance.\n //\n // `from` is the origin address for the funds the Pool receives, and `to` is the destination address\n // where the Pool sends the outgoing tokens.\n //\n // `userData` is extra data provided by the caller - typically a signature from a trusted party.\n struct SwapRequest {\n IVault.SwapKind kind;\n IERC20 tokenIn;\n IERC20 tokenOut;\n uint256 amount;\n // Misc data\n bytes32 poolId;\n uint256 lastChangeBlock;\n address from;\n address to;\n bytes userData;\n }\n}\n" }, "contracts/pools/oracle/Samples.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\nimport \"../../lib/helpers/WordCodec.sol\";\nimport \"../IPriceOracle.sol\";\n\n/**\n * @dev This library provides functions to help manipulating samples for Pool Price Oracles. It handles updates,\n * encoding, and decoding of samples.\n *\n * Each sample holds the timestamp of its last update, plus information about three pieces of data: the price pair, the\n * price of BPT (the associated Pool token), and the invariant.\n *\n * Prices and invariant are not stored directly: instead, we store their logarithm. These are known as the 'instant'\n * values: the exact value at that timestamp.\n *\n * Additionally, for each value we keep an accumulator with the sum of all past values, each weighted by the time\n * elapsed since the previous update. This lets us later subtract accumulators at different points in time and divide by\n * the time elapsed between them, arriving at the geometric mean of the values (also known as log-average).\n *\n * All samples are stored in a single 256 bit word with the following structure:\n *\n * [ log pair price | bpt price | invariant ]\n * [ instant | accumulator | instant | accumulator | instant | accumulator | timestamp ]\n * [ int22 | int53 | int22 | int53 | int22 | int53 | uint31 ]\n * MSB LSB\n *\n * Assuming the timestamp doesn't overflow (which holds until the year 2038), the largest elapsed time is 2^31, which\n * means the largest possible accumulator value is 2^21 * 2^31, which can be represented using a signed 53 bit integer.\n */\nlibrary Samples {\n using WordCodec for int256;\n using WordCodec for uint256;\n using WordCodec for bytes32;\n\n uint256 internal constant _TIMESTAMP_OFFSET = 0;\n uint256 internal constant _ACC_LOG_INVARIANT_OFFSET = 31;\n uint256 internal constant _INST_LOG_INVARIANT_OFFSET = 84;\n uint256 internal constant _ACC_LOG_BPT_PRICE_OFFSET = 106;\n uint256 internal constant _INST_LOG_BPT_PRICE_OFFSET = 159;\n uint256 internal constant _ACC_LOG_PAIR_PRICE_OFFSET = 181;\n uint256 internal constant _INST_LOG_PAIR_PRICE_OFFSET = 234;\n\n /**\n * @dev Updates a sample, accumulating the new data based on the elapsed time since the previous update. Returns the\n * updated sample.\n *\n * IMPORTANT: This function does not perform any arithmetic checks. In particular, it assumes the caller will never\n * pass values that cannot be represented as 22 bit signed integers. Additionally, it also assumes\n * `currentTimestamp` is greater than `sample`'s timestamp.\n */\n function update(\n bytes32 sample,\n int256 instLogPairPrice,\n int256 instLogBptPrice,\n int256 instLogInvariant,\n uint256 currentTimestamp\n ) internal pure returns (bytes32) {\n // Because elapsed can be represented as a 31 bit unsigned integer, and the received values can be represented\n // as 22 bit signed integers, we don't need to perform checked arithmetic.\n\n int256 elapsed = int256(currentTimestamp - timestamp(sample));\n int256 accLogPairPrice = _accLogPairPrice(sample) + instLogPairPrice * elapsed;\n int256 accLogBptPrice = _accLogBptPrice(sample) + instLogBptPrice * elapsed;\n int256 accLogInvariant = _accLogInvariant(sample) + instLogInvariant * elapsed;\n\n return\n pack(\n instLogPairPrice,\n accLogPairPrice,\n instLogBptPrice,\n accLogBptPrice,\n instLogInvariant,\n accLogInvariant,\n currentTimestamp\n );\n }\n\n /**\n * @dev Returns the instant value stored in `sample` for `variable`.\n */\n function instant(bytes32 sample, IPriceOracle.Variable variable) internal pure returns (int256) {\n if (variable == IPriceOracle.Variable.PAIR_PRICE) {\n return _instLogPairPrice(sample);\n } else if (variable == IPriceOracle.Variable.BPT_PRICE) {\n return _instLogBptPrice(sample);\n } else {\n // variable == IPriceOracle.Variable.INVARIANT\n return _instLogInvariant(sample);\n }\n }\n\n /**\n * @dev Returns the accumulator value stored in `sample` for `variable`.\n */\n function accumulator(bytes32 sample, IPriceOracle.Variable variable) internal pure returns (int256) {\n if (variable == IPriceOracle.Variable.PAIR_PRICE) {\n return _accLogPairPrice(sample);\n } else if (variable == IPriceOracle.Variable.BPT_PRICE) {\n return _accLogBptPrice(sample);\n } else {\n // variable == IPriceOracle.Variable.INVARIANT\n return _accLogInvariant(sample);\n }\n }\n\n /**\n * @dev Returns `sample`'s timestamp.\n */\n function timestamp(bytes32 sample) internal pure returns (uint256) {\n return sample.decodeUint31(_TIMESTAMP_OFFSET);\n }\n\n /**\n * @dev Returns `sample`'s instant value for the logarithm of the pair price.\n */\n function _instLogPairPrice(bytes32 sample) private pure returns (int256) {\n return sample.decodeInt22(_INST_LOG_PAIR_PRICE_OFFSET);\n }\n\n /**\n * @dev Returns `sample`'s accumulator of the logarithm of the pair price.\n */\n function _accLogPairPrice(bytes32 sample) private pure returns (int256) {\n return sample.decodeInt53(_ACC_LOG_PAIR_PRICE_OFFSET);\n }\n\n /**\n * @dev Returns `sample`'s instant value for the logarithm of the BPT price.\n */\n function _instLogBptPrice(bytes32 sample) private pure returns (int256) {\n return sample.decodeInt22(_INST_LOG_BPT_PRICE_OFFSET);\n }\n\n /**\n * @dev Returns `sample`'s accumulator of the logarithm of the BPT price.\n */\n function _accLogBptPrice(bytes32 sample) private pure returns (int256) {\n return sample.decodeInt53(_ACC_LOG_BPT_PRICE_OFFSET);\n }\n\n /**\n * @dev Returns `sample`'s instant value for the logarithm of the invariant.\n */\n function _instLogInvariant(bytes32 sample) private pure returns (int256) {\n return sample.decodeInt22(_INST_LOG_INVARIANT_OFFSET);\n }\n\n /**\n * @dev Returns `sample`'s accumulator of the logarithm of the invariant.\n */\n function _accLogInvariant(bytes32 sample) private pure returns (int256) {\n return sample.decodeInt53(_ACC_LOG_INVARIANT_OFFSET);\n }\n\n /**\n * @dev Returns a sample created by packing together its components.\n */\n function pack(\n int256 instLogPairPrice,\n int256 accLogPairPrice,\n int256 instLogBptPrice,\n int256 accLogBptPrice,\n int256 instLogInvariant,\n int256 accLogInvariant,\n uint256 _timestamp\n ) internal pure returns (bytes32) {\n return\n instLogPairPrice.encodeInt22(_INST_LOG_PAIR_PRICE_OFFSET) |\n accLogPairPrice.encodeInt53(_ACC_LOG_PAIR_PRICE_OFFSET) |\n instLogBptPrice.encodeInt22(_INST_LOG_BPT_PRICE_OFFSET) |\n accLogBptPrice.encodeInt53(_ACC_LOG_BPT_PRICE_OFFSET) |\n instLogInvariant.encodeInt22(_INST_LOG_INVARIANT_OFFSET) |\n accLogInvariant.encodeInt53(_ACC_LOG_INVARIANT_OFFSET) |\n _timestamp.encodeUint31(_TIMESTAMP_OFFSET);\n }\n\n /**\n * @dev Unpacks a sample into its components.\n */\n function unpack(bytes32 sample)\n internal\n pure\n returns (\n int256 logPairPrice,\n int256 accLogPairPrice,\n int256 logBptPrice,\n int256 accLogBptPrice,\n int256 logInvariant,\n int256 accLogInvariant,\n uint256 _timestamp\n )\n {\n logPairPrice = _instLogPairPrice(sample);\n accLogPairPrice = _accLogPairPrice(sample);\n logBptPrice = _instLogBptPrice(sample);\n accLogBptPrice = _accLogBptPrice(sample);\n logInvariant = _instLogInvariant(sample);\n accLogInvariant = _accLogInvariant(sample);\n _timestamp = timestamp(sample);\n }\n}\n" }, "contracts/pools/oracle/IWeightedPoolPriceOracle.sol": { "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see .\n\npragma solidity ^0.7.0;\n\ninterface IWeightedPoolPriceOracle {\n /**\n * @dev Returns the raw data of the sample at `index`.\n */\n function getSample(uint256 index)\n external\n view\n returns (\n int256 logPairPrice,\n int256 accLogPairPrice,\n int256 logBptPrice,\n int256 accLogBptPrice,\n int256 logInvariant,\n int256 accLogInvariant,\n uint256 timestamp\n );\n\n /**\n * @dev Returns the total number of samples.\n */\n function getTotalSamples() external view returns (uint256);\n}\n" } }, "settings": { "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "abi" ] } }, "libraries": {} } }}

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