Interagir avecMainNet Ethereum MainNet Ganache et Quicknode
Interagir avecMainNet Ethereum MainNet Ganache et Quicknode
Lors du développement de dApps en local, la procédure permettant d'interagir avec des protocoles tels que Compound et MakerDAO peut s'avérer fastidieuse. Il faut en effet récupérer les contrats intelligents de ces protocoles sur Etherscan, puis les initialiser avec des données.
16 septembre 2019 — 2 min de lecture
Mainnet Ethereum Mainnet votre environnement local
Lors du développement de dApps en local, le processus d'interaction avec des protocoles tels que Compound et MakerDAO peut s'avérer fastidieux.
Nous devons récupérer les contrats intelligents de ces protocoles sur Etherscan, puis les initialiser avec des données.
En général, nous recherchons (ou développons) des scripts pour configurer notre environnement Truffle (consultez ce script pour configurer la plateforme d'échange Uniswap en local), ce qui est un processus susceptible d'engendrer des erreurs.
Cependant, à mesure que les protocoles gagnent en complexité, ces scripts de migration deviennent eux aussi de plus en plus complexes.
Certains de ces protocoles contiennent jusqu'à 50 contrats intelligents ! C'est le cas, par exemple, de ce script de migration de MakerDao, qui permet de migrer environ 40 contrats intelligents.
Mais désormais, grâce à Ganache et Quicknode, nous pouvons disposer d’une version virtuelle duMainNet Ethereum , pour une utilisation rapide et pratique en local !
ganache-cli --fork {URL du fournisseur quicknode }@{numéro de bloc}
Ici, numéro de bloc est facultatif ; si vous ne précisez pas de bloc, seules les informations du dernier bloc seront récupérées.
Remarque : cela ne téléchargera pas MainNet Ethereum; il suffira d'effectuer l'appel directement vers votre nœud lorsque cela sera nécessaire.
N'oubliez pas que vous devez encore configurer l'interface avec les contrats externes.
Prenons un exemple :
var http = require('http');
var Web3 = require('web3');
var provider = 'http://127.0.0.1:8545';
var web3Provider = new Web3.providers.HttpProvider(provider);
var web3 = new Web3(web3Provider);
var DAI_TOKEN_ADDRESS = "0x89d24A6b4CcB1B6fAA2625fE562bDD9a23260359"
var Wallet_address = "0x2c82E14352e98c931852D9BB5f0760E36942CC3c"
var DAI_ABI = [{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"stop","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"guy","type":"address"},{"name":"wad","type":"uint256"}],"name":"approve","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"owner_","type":"address"}],"name":"setOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"src","type":"address"},{"name":"dst","type":"address"},{"name":"wad","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"guy","type":"address"},{"name":"wad","type":"uint256"}],"name":"mint","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"wad","type":"uint256"}],"name":"burn","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"name_","type":"bytes32"}],"name":"setName","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"src","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"stopped","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"authority_","type":"address"}],"name":"setAuthority","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"guy","type":"address"},{"name":"wad","type":"uint256"}],"name":"burn","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"wad","type":"uint256"}],"name":"mint","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"dst","type":"address"},{"name":"wad","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"dst","type":"address"},{"name":"wad","type":"uint256"}],"name":"push","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"src","type":"address"},{"name":"dst","type":"address"},{"name":"wad","type":"uint256"}],"name":"move","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"start","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"authority","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"guy","type":"address"}],"name":"approve","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"src","type":"address"},{"name":"guy","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"src","type":"address"},{"name":"wad","type":"uint256"}],"name":"pull","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"symbol_","type":"bytes32"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"guy","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Mint","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"guy","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Burn","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"authority","type":"address"}],"name":"LogSetAuthority","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"}],"name":"LogSetOwner","type":"event"},{"anonymous":true,"inputs":[{"indexed":true,"name":"sig","type":"bytes4"},{"indexed":true,"name":"guy","type":"address"},{"indexed":true,"name":"foo","type":"bytes32"},{"indexed":true,"name":"bar","type":"bytes32"},{"indexed":false,"name":"wad","type":"uint256"},{"indexed":false,"name":"fax","type":"bytes"}],"name":"LogNote","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":true,"name":"guy","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":true,"name":"dst","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Transfer","type":"event"}]
let contract = new web3.eth.Contract(DAI_ABI, DAI_TOKEN_ADDRESS)
const foo = async () => {
try {
var balance = await contract.methods.balanceOf(Wallet_address).call();
console.log(balance);
} catch (err) {
console.log(err.message);
}
}
foo();
web3.eth.getBlockNumber().then((result) => {
web3.eth.getBlock(result).then((block) =>{
console.log(block);
})
console.log(result);
});Obtenir le solde en jetons DAI d'une adresse donnée sur MainNet
Vous trouverez ci-dessus un script simple permettant d'obtenir le solde en jetons DAI d'une adresse de portefeuille donnée. Dans ce cas précis, nous avons simplement ajouté l'ABI du jeton DAI et l'adresse du contrat MainNet DAI MainNet .
Lorsque vous exécuterez ce script, il nous donnera le résultat souhaité :
Nous récupérons le solde en DAI d'une adresse donnée sur leMainNet Ethereum , ainsi que le numéro du dernier bloc et les détails de ce bloc.
Comme vous pouvez le constater, nous pouvons désormais récupérer MainNet réelles MainNet dans notre environnement local. De la même manière, nous pouvons également utiliser des testnets avec Ganache.
Vous avez besoin d'aide pour votre projet ou vous avez des questions ? Contactez-nous via ce formulaire, sur TwitterQuicknode, ou envoyez-nous un message sur Discord!
À propos de Quicknode
Fondée en 2017, Quicknode une infrastructure blockchain de niveau institutionnel destinée aux développeurs et aux entreprises. Grâce à une disponibilité de 99,99 % et à la prise en charge de plus de 80 chaînes, les équipes peuvent développer et faire évoluer leurs applications sur la blockchain sans aucun compromis.
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