Solidity Web3发起查询和转账eth转账token调用contract方法

refer to:

如下：

查询ETH，转账ETH：

const fs = require('fs')

const wethAbi = JSON.parse(fs.readFileSync('artifacts/contracts/WETH9.sol/WETH9.json')).abi

let wethAddress = '0x8464135c8F25Da09e49BC8782676a84730C318bC'
let rpcUrl = "http://localhost:8545"

// Account #4: 0x15d34AAf54267DB7D7c367839AAf71A00a2C6A65 (10000 ETH)
privateKey = '0x47e179ec197488593b187f80a00eb0da91f1b9d0b13f8733639f19c30a34926a'

async function main(){

  const web3 = new Web3(new Web3.providers.HttpProvider(rpcUrl))

  const signer = web3.eth.accounts.privateKeyToAccount(privateKey)
  web3.eth.accounts.wallet.add(signer)

  let wethContract = new web3.eth.Contract(wethAbi, wethAddress)

  // 查询对应账户的余额
  console.info("== totalSupply: ", await wethContract.methods.totalSupply().call())
  console.info("== balance: contract(0x8464135c8F25Da09e49BC8782676a84730C318bC): ", await wethContract.methods.balanceOf("0x8464135c8F25Da09e49BC8782676a84730C318bC").call())
  console.info("== balance: lend_to(0x15d34AAf54267DB7D7c367839AAf71A00a2C6A65): ", await wethContract.methods.balanceOf("0x15d34AAf54267DB7D7c367839AAf71A00a2C6A65").call())
  // 尝试一下给人转账

  let txOptions = {
    from: signer.address,
    to: wethAddress,
    value: web3.utils.toWei("10", "ether"),
    gasLimit: 210000
  }
  let estimatedGas = await web3.eth.estimateGas(txOptions)
  txOptions.gas = estimatedGas
  let result = await web3.eth.sendTransaction(txOptions)

  console.info("== result: ", result)
  console.info("== balance: current account(0x15d34AAf54267DB7D7c367839AAf71A00a2C6A65): ", await wethContract.methods.balanceOf("0x15d34AAf54267DB7D7c367839AAf71A00a2C6A65").call())

}

main()

调用contract的方法，

下面是转token的。

async function main(){

  const web3 = new Web3(new Web3.providers.HttpProvider(rpcUrl))

  const signer = web3.eth.accounts.privateKeyToAccount(privateKey)
  web3.eth.accounts.wallet.add(signer)


  let wethContract = new web3.eth.Contract(wethAbi, wethAddress)
  console.info("== before give, SafeLender balance:", await wethContract.methods.balanceOf(safeLenderAddress).call())

  let tx = wethContract.methods.transfer(safeLenderAddress, web3.utils.toWei("10", "ether"))
  //let receipt = await tx.send({ from: signer.address, gas: await tx.estimateGas()})
  let receipt = await tx.send({ from: signer.address, gasLimit: 240000})
    .once("transactionHash", (txHash) => {
      console.info("=== mining transaction hash: ", txHash)
    })
  console.info("== receipt: ", receipt)

特别神奇，一开始执行了 gasPrice的时候会报错：

Error: Returned error: Error: VM Exception while processing transaction: reverted with reason string ''

去掉gas price, 加上gas limit 就好了。

而且gas limit 默认是24000, 报错说gas out of range, 用光了。改成240000 ，就好了。