No events captured

[perbergman]

[Ethereum events]

I am trying to use standard Ethereum event subscriptions, but I don't see any events.
Is this not supported?

Description

`const Web3 = require('web3');
const delay = time => new Promise(res=>setTimeout(res,time));
const WEB3_PROVIDER = 'ws://:10002/ws';

const web3 = new Web3(WEB3_PROVIDER);
const address = '0x';

async function main() {
console.log(1);
let x = await web3.eth.subscribe('logs', {
address: address,
topics: [
web3.utils.sha3("Transfer(address,address,uint256)")
]
}, (error, result) => {
if (error) {
console.error(error);
} else {
console.log(result);
}
});
console.log(x);
await delay(5*60000);
console.log(3);
}

main()
.then(() => process.exit(0))
.catch(error => {
console.error(error);
process.exit(1);
});
`

Your environment

• OS and version
  Server runs ubuntu 22.04.

• version of the Polygon Edge
  0.5.0

• branch that causes this issue
  Release

Steps to reproduce

Start the nodes.
Deploy the contract.
Start the event listener (above).
Run a test case operating the contract.

Expected behaviour

To see events being logged.

Actual behaviour

No events appear.

[laviniat1996]

@perbergman Can you check the deployment of the contract with getCode: https://wiki.polygon.technology/docs/edge/get-started/json-rpc-commands#eth_getcode ?

[perbergman]

curl http://:10002 -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_getCode","params":["0x7d75a8C6531b38a93A3B9A47b03aB6dA715831e4", "latest"],"id":1}' > out.txt

out.txt

[perbergman]

I can run transactions and see them in Block Scout, and with queries, but I don't see any events.
If I use --show-events with truffle, I get exceptions (doesn't happen with ganache, etc.).

BTW, I can't get it to work with hardhat at all, no big deal though.

[laviniat1996]

@perbergman What happens when you start the event listener? Do you get any errors?
I just want to mention that we do support this, and I tested it today on my end.

Can you try using it with const WEB3_PROVIDER = 'ws://localhost:10002/ws' ?

[perbergman]

I started it with the 'ws' and I don't see any errors, no output at all.

Seems my paste removed stuff, the URL is const WEB3_PROVIDER = 'ws://x.y.x:10002/ws';

I am running remotely from macOS --> AWS/ubuntu.

[perbergman]

I don't see an eth_subscribe command in that list above, but there is eth_unsubscribe?

[laviniat1996]

Hi @perbergman ,

I'm back with updates. Your event subscription script actually works.
The steps I followed for testing:

1. Create a .js file with your code (let's call it listener.js)
2. Started a local chain
3. Created a dummy contract to test the script:

// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.5.0;
contract Test {
   event Transfer(address,address,uint256);
   function emitEvent() public payable {      
      emit Transfer(msg.sender,msg.sender,5000);
   }
}

5. Deployed the contract with Remix
6. I changed the contract address in the script
7. Ran the script (node listener.js - makes sure to install all js dependencies)
8. Triggered an event

[perbergman]

I will try that. The issue might be that we deploy to a remote chain and networking etc. I am running a four-node Polygon Edge network with remote clients.

I will try to run the listener locally as well. I wonder if it has to do with the naming of the topic as well. We are using ERC1155.

[perbergman]

I am running the Test contract remote with a listener locally, and now I see those events.
Next is to use my actual contracts.

Thanks,
Per

[perbergman]

I got it to work all the way. The difference was when I did not use Truffle to deploy, but straight web3.

[laviniat1996]

Hi @perbergman ,

Thank you for your updates. I'm glad it finally worked. Please feel free to open an issue whenever there's need.