Solana Web3.js getParsedTransaction 有时会返回 null

Question

I am trying to get transaction values using signature id from any of the NFT's signature. For a test, I used the same signature and loop it 100 times to make sure that it is a valid signature with existing value

I did console.log on the index of the for loop. For some reason, it is returning null sometimes within the loop.

I am using Quicknode's RPC. ($9/month)

Am I missing something that caused this issue?

Code

async function test() {
    for (let i = 0; i < 100; i++) {
        signatures = await connection.getSignaturesForAddress(new PublicKey('BUPzNBDy3gVRRz1AqyzCDSnp15uAxh5j61dEj5GLLfx6'));
        let signatures2 = signatures.map(({ signature }) => signature)
        for (let a = 0; a < signatures2.length; a++) {
            let txns = await connection.getParsedTransaction(signatures2[a], 'finalized')
            if (!txns) {
                console.log('null')
            } else {
                console.log('ok')

            }
        }

    }
}

exports.get_collection_volume = (req, res) => {
    test()
}

Output

0
1
2
3
null
null
6
7
null
null
null
null
12
null
14
null
16

Answer 1

I cannot reproduce the issue (also using Quiknode), I suspect it's probably an RPC/network issue.

However, looping 100 times on getParsedTransaction is probably not the best way to verify the validity of a signature. Instead you can use getSignatureStatus and verify that the transaction has a confirmationStatus of finalized and that err is null .

For instance:

const isValidSignature = async (connection: Connection, sig: string) => {
  const status = await connection.getSignatureStatus(sig, {
    searchTransactionHistory: true,
  });
  return (
    status.value?.err === null &&
    status.value?.confirmationStatus === "finalized"
  );
};

If you don't just want to verify that the signature is valid but also extract parsed transaction details you can do something like:

const getParsedTx = async (connection: Connection, sig: string) => {
  const parsed = await connection.getParsedTransaction(sig, "finalized");
  if (!parsed || parsed?.meta?.err !== null) {
    throw new Error("Invalid signature");
  }
  return parsed;
};