sendTransaction.js

sendTransaction.js

const drawing = async (privateKey) => {
  console.log('Drawing...');
  const address = getUserAddress(privateKey);
  const nonce = await web3.eth.getTransactionCount(address);
  const gasPriceWei = await web3.eth.getGasPrice();
  const randomHex = Web3.utils.randomHex(32).substr(2);
  const randomNumber = new BN(randomHex, 16).toString();
  const data = LotteryContract.methods.drawing(randomNumber).encodeABI();
  const signedTx = await web3.eth.accounts.signTransaction({
    to: contractAddress,
    gas: 2000000,
    data: data,
    gasPrice: gasPriceWei,
    nonce: nonce,
    chainId: CHAIN_ID,
  }, privateKey);

  const result = await web3.eth.sendSignedTransaction(signedTx.rawTransaction);
  console.log('drawing', result.transactionHash);
  const logs = web3.eth.abi.decodeLog([
    {
      "indexed": true,
      "internalType": "uint256",
      "name": "issueIndex",
      "type": "uint256"
    },
    {
      "indexed": false,
      "internalType": "uint8[4]",
      "name": "winningNumbers",
      "type": "uint8[4]"
    }
  ],
    result.logs[0].data,
    result.logs[0].topics[1] // indexed topic
  );
  console.log('issueIndex', logs.issueIndex);
  console.log('winningNumbers', logs.winningNumbers);
};