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Script web3 to call a method of a smart contract
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import Web3 from "web3"; | |
import dotenv from "dotenv"; | |
import HDWalletProvider from "@truffle/hdwallet-provider"; | |
// We assume you have a .env file with MNEMONIC and INFURA_ID variables | |
dotenv.config(); | |
const provider = new HDWalletProvider( | |
`${process.env.MNEMONIC}`, // Seed phrase of your wallet | |
`https://goerli.infura.io/v3/${process.env.INFURA_ID}` // Infura ID token | |
); | |
const web3 = new Web3(provider); | |
// ABI for a simple storage contract | |
var abi = [ | |
{ | |
inputs: [], | |
name: "number", | |
outputs: [ | |
{ | |
internalType: "uint256", | |
name: "", | |
type: "uint256", | |
}, | |
], | |
stateMutability: "view", | |
type: "function", | |
}, | |
{ | |
inputs: [], | |
name: "retrieve", | |
outputs: [ | |
{ | |
internalType: "uint256", | |
name: "", | |
type: "uint256", | |
}, | |
], | |
stateMutability: "view", | |
type: "function", | |
}, | |
{ | |
inputs: [ | |
{ | |
internalType: "uint256", | |
name: "num", | |
type: "uint256", | |
}, | |
], | |
name: "store", | |
outputs: [], | |
stateMutability: "payable", | |
type: "function", | |
}, | |
]; | |
// Address of the deployed contract | |
var addr = "0x9AC7f23499CB84B3F52A682B03AB2B2F557E0F13"; | |
// Contract to interact with | |
var Contract = new web3.eth.Contract(abi, addr); | |
// Call the retrieve function | |
Contract.methods.retrieve().call().then(console.log); | |
// Call the store function | |
await Contract.methods | |
.store(333) | |
.send({ from: "0x242e5908Fe2DACdb90D99d5f4b311f9f64Cff51C" }); | |
// Check the value of the retrieve function | |
Contract.methods.retrieve().call().then(console.log); |
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