web3js: Can I send a signed Transaction without wait the result?

Question

Commonly, I dow

const receipt = await web3.eth.sendSignedTransaction(web3, signed_transaction);
console.log("tx_hash:", receipt.transactionHash);
console.log("gas_used:", receipt.gasUsed);
console.log("gas_price:", offered_gas_price);

But I do not want (no more) to get the return output, because it's too slow.

So I started a nodejs server to listen to contract events, and it works.

No, how can I call web3.eth.ssendSignedTransaction without wait for result?

I simply tried to call

web3.eth.sendSignedTransaction(web3, signed_transaction);

But I discovered that nothing is happening at all against my contract.

Should be a js problem only. But, in case no, can I simply send a transaction and ignore esit?

how?

Answer 1

You should be able to send a transaction without waiting for confirmations. I'd check if the transaction status, if it is in the pending pool, or it was mined and it failed.

With web3 1.2 you can listen for the transactionHash and query for the transaction details. See the documentation https://web3js.readthedocs.io/en/v1.2.6/callbacks-promises-events.html#promievent

web3.eth.sendSignedTransaction('0x...')
  .once('transactionHash', function(hash){
    web3.eth.getTransactionReceipt(hash).then(() => {
    ..
  })
})

---

To wait for the hash you might wrap the call in a promise

function waitForHash(signedTx) {
  return new Promise((resolve, reject) => {
    web3.eth.sendSignedTransaction(signedTx)
      .once('transactionHash', (hash) => {
        resolve(hash)
    })
  })
}

Now you can call it like this:

const hash = await waitForHash('0x....')