概述

TRON's blockchain ecosystem includes both native and EVM-compatible token standards, making it challenging to consistently retrieve token metadata across different address formats. This Function simplifies the process by enabling developers to query TRC20 token information using either TRON native or EVM-compatible addresses.

In this Function example, we will convert TRON addresses to their EVM-compatible format when necessary, and use Web3.js to fetch essential token metadata like name, symbol, decimals, and total supply from the TRON blockchain.

Sample Function

The following is the code for the Function to retrieve TRC20 token metadata using the Node.js v20 runtime, supporting both TRON native and EVM-compatible addresses:

const { Web3 } = require('web3')
const bs58 = require('bs58')

// Replace with the TRON Quicknode endpoint
const tronEvmNodeUrl = ''

const web3 = new Web3(tronEvmNodeUrl)

// ERC20/TRC20 ABI
const tokenABI = [
	{
		constant: true,
		inputs: [],
		name: 'name',
		outputs: [{ name: '', type: 'string' }],
		type: 'function',
	},
	{
		constant: true,
		inputs: [],
		name: 'symbol',
		outputs: [{ name: '', type: 'string' }],
		type: 'function',
	},
	{
		constant: true,
		inputs: [],
		name: 'decimals',
		outputs: [{ name: '', type: 'uint8' }],
		type: 'function',
	},
	{
		constant: true,
		inputs: [],
		name: 'totalSupply',
		outputs: [{ name: '', type: 'uint256' }],
		type: 'function',
	},
]

// Function to convert TRON address to EVM address
function convertTronToEvmAddress(tronAddress) {
	if (tronAddress.startsWith('T')) {
		// Decode the base58 address
		const decoded = bs58.decode(tronAddress)

		// Remove the first byte (address type) and the last 4 bytes (checksum)
		const addressHex = decoded.slice(1, -4).toString('hex')

		// Add '0x' prefix to make it a valid Ethereum-style address
		return '0x' + addressHex
	}
	// If it's already an EVM address, return as is
	return tronAddress
}

async function fetchTokenMetadata(contractAddress) {
	try {
		// Convert address if it's in TRON format
		const evmAddress = convertTronToEvmAddress(contractAddress)

		// Create contract instance
		const contract = new web3.eth.Contract(tokenABI, evmAddress)

		// Fetch token metadata
		const [name, symbol, decimals, totalSupply] = await Promise.all([
			contract.methods.name().call(),
			contract.methods.symbol().call(),
			contract.methods.decimals().call(),
			contract.methods.totalSupply().call(),
		])

		// Return the results
		return {
			address: {
				original: contractAddress,
				evm: evmAddress,
			},
			name,
			symbol,
			decimals: parseInt(decimals),
			totalSupply: totalSupply.toString(),
		}
	} catch (error) {
		console.error('Error fetching token metadata:', error)
		throw error
	}
}

async function main(params) {
	try {
		const contractAddress = params.user_data.contractAddress
		if (!contractAddress) {
			throw new Error('Contract address is required')
		}

		const metadata = await fetchTokenMetadata(contractAddress)

		return {
			statusCode: 200,
			metadata,
		}
	} catch (error) {
		console.error('Error in main function:', error)

		return {
			statusCode: 500,
			body: JSON.stringify({ error: error.message }),
		}
	}
}

module.exports = { main }

请求

We will invoke the function with the following cURL command. A few notes:

• Replace the YOUR_API_KEY with your own Quicknode API key - follow this guide for creating an API key.
• Replace the FUNCTION_ID with the ID of your Function - you can find this in the URL when viewing your Function in the Quicknode Dashboard.
• Network and block_number values are not passed in this function.
• Custom parameters are passed in a user_data object. In our case:
  • You can send the request with any TRON TRC20 token contract address (contractAddress) to fetch metadata.

curl -X POST "https://api.quicknode.com/functions/rest/v1/functions/FUNCTION_ID/call?result_only=true" \
  -H "accept: application/json" \
  -H "Content-Type: application/json" \
  -H "x-api-key: YOUR_API_KEY" \
  -d '{
    "user_data": {
      "contractAddress": "TUEYcyPAqc4hTg1fSuBCPc18vGWcJDECVw"
    }
  }'

回复

Resulting in the following response:

{
  "metadata": {
    "address": {
      "evm": "0xc858e17d9c51e729cf4e357a798814cdd1262eaa",
      "original": "TUEYcyPAqc4hTg1fSuBCPc18vGWcJDECVw"
    },
    "decimals": 6,
    "name": "Justswap V1",
    "symbol": "JUSTSWAP-V1",
    "totalSupply": "480633872315709"
  },
  "statusCode": 200
}

Learn more about Quicknode Functions.

我们 ❤️ 您的反馈！

如果您有任何反馈或对新主题的建议，请告诉我们。我们非常期待您的来信。