Recieve transaction id of an event

[dratsuc1]

Hi, I'm looking at this contract's events:
https://etherscan.io/address/0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f#events

I'm able to recieve it's function 'PairCreated' however I also want it's associated transaction:
https://etherscan.io/tx/0x28fb38ff07efb68f378e3ea832500acb3e6bef458ffada83b9ac09dcbc82d1ad

(specifically the amount of ethereum transferred for the new Pair) I was hoping there was some way to get the transaction and it's information.

Is your feature request related to a problem? Please describe.
Not that I'm aware of, It could possibly be I need to use:
https://github.com/ethers-io/ethers.js/blob/master/packages/contracts/src.ts/index.ts#L992
to recieve the transaction id, but I don't speak javascript.

Describe the solution you'd like
Hopefully a pointer towards how to do what I'm trying to do

Describe alternatives you've considered
Mentioned above ^^

Additional context
Trying to get the amount of ethereum transferred when a new pair is created with uniswap

[zemse]

You can use ethers's contract.queryFilter (docs for past events, and contract.on (docs) for future events.

The transaction hash is available as event.transactionHash.

const events = contract.queryFilter(contract.filters.PairCreated());
events[0].transactionHash

contract.on('PairCreated', (...args) => {
  const event = args[args.length - 1];
  event.transactionHash;
})

Once you have the tx hash, you can do provider.getTransaction (docs) to extract the value.

const tx = await provider.getTransaction(event.transactionHash);
tx.value

(moving to discussions)

[dratsuc1]

Hi man, really appreciate your clear answer and help here.

I've managed to catch a transaction! I'm new to Javascript, coming from other languages has been tough with the use of asyncs and awaits!

how may I go about converting this big number into it's human form? If you can share a better approach please do :)

I've managed to answer all my questions through working on this for the past few hours so i've deleted those questions

    console.log(tx.value.div(100000000).div(10000000000).toNumber())

[zemse]

You can actually do ethers.utils.formatEther(tx.value). You can find this section of docs helpful. Also when you are doing .toNumber(), it is possible that you might run into precision errors you can refer to this part on the same page.

[dratsuc1]

Wow, thanks for the quick replies.

I honestly have 1 last question, I have all of my code working now! However the factory.on I have seems to randomly stop activating. I can see in the docker logs it's running (and up) for 2 hours:

factory.on('PairCreated', async (...args) => {
  console.log('\nNew pair detected!')
});

8e8c62916e47   lerring/listner   "docker-entrypoint.s…"   2 hours ago   Up 2 hours                listener

However the latest pair I have detected is 0x5DffFb62Ff54022a97E46E3F9F6904530bdf4dB2 which is from over an hour ago.

I can see there's been tokens recently appearing:

Do I have to find a way to check if the listener has been somehow disconnected? If so what would that approach be?

Kind regards!