[ethers.js] Transaction details 얻기 및 ERC20 Transfer 정보 얻기

hardhat task로 만든 txHash로 transaction details 얻어서 ERC20 Transfer() 이면 정보 출력.

task("trasactionDetails", "Get the transaction deatils")
  .addPositionalParam("txHash", "Transaction Hash")
  .setAction(async (taskArgs, hre) => {
    const provider = ethers.provider;
    const transaction = await provider.getTransaction(taskArgs.txHash);
    console.log(transaction);
    if (transaction.value === 0n) {
      if (transaction.data.slice(0, 10) === "0xa9059cbb") {
        console.log("---- ERC20 Transfer -------------------------");
        await hre.run("parseERC20TransferData", { data: transaction.data });
      }
    }
  });

task("parseERC20TransferData", "Parsing")
  .addPositionalParam("data", "Transacton Data")
  .setAction(async (taskArgs) => {
    const abiCoder = new ethers.AbiCoder();
    const decodedData = abiCoder.decode(['address', 'uint256'], "0x" + taskArgs.data.slice(10));
    const to = decodedData[0];
    const value = decodedData[1].toString();

    console.log('To Address:', to);
    console.log('Token Amount:', ethers.formatEther(value));
  });