getTransactionReceipt sometimes blocks, expected always non-blocking?

[jnieuwenhuijzen]

Hi,

I am using the function getTransactionReceipt and expecting it to be always non blocking.

Testing it on some random transactions that are in the mempool waiting to be confirmed or already mined transactions return a value immediately. However when I run it on live transactions (via my local node - openethereum) the request becomes blocking until the transaction is mined. Strangely enough this does not happen all the time.

Is this expected behaviour or is this a bug?

Thanks in advance,
Jarl

[ricmoo]

What version are you using? Nothing has access to the mempool, but in previous versions an internal cache used for consistency could cause a transaction that was submitted through the same provider, in some cases, cause a blocking getTransactionReceipt. This should not be happen in 5.2.0 though…

[jnieuwenhuijzen]

@ricmoo I tried with the v5.2.0 but still same result, it keeps blocking until the transaction is mined ..

[jnieuwenhuijzen]

I try to find some more logic in when it does not block. It seems if there are more than 1 transaction in process it unblocks. So e.g. if I resend the same transaction with higher gas fee, it unblocks. Also if I send transactions that are sent relatively fast after each other (the 2nd 5 seconds after the first was mined) the 2nd is unblocking from the start.
A bit vague, but that's what I 'm noticing thus far :-)

[zemse]

You can also try with provider.getTransaction. If that call returns an object with null blockNumber it means it is not mined otherwise it is.

[jnieuwenhuijzen]

Yes I will try that one. It returns a slightly different object (TransactionReceipt vs TransactionResponse) but I probably can manage

[jnieuwenhuijzen]

provider.getTransaction does the trick. To get to a TransactionReceipt I call after a mined transaction from getTransaction the function getTransactionReceipt.

For ease it would be nice if getTransactionReceipt also works non-blocking, but I am ok with my current setup.

Thanks 🙏