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I’m developing an application on a private Ethereum chain and trying to listen to some events. I wrote a basic indexer script for listening to events and writing them in a database. To listen to the events I am connecting to the provider via Web3.providers.WebsocketsProvider. I realized it keeps losing the connection every minute. And::Listen
I’m developing an application on a private Ethereum chain and trying to listen to some events. I wrote a basic indexer script for listening to events and writing them in a database.
To listen to the events I am connecting to the provider via Web3.providers.WebsocketsProvider
. I realized it keeps losing the connection every minute. And actually it does not disconnect, instead, it creates a new connection every minute as I don’t catch any logs from error
or end
events.
As a workaround, I added reconnect
options introduced in web3.js v1.2.7. That’s how I noticed the regular dropping each minute.
Here’s the code:
const Web3 = require('web3'); const TruffleContract = require('@truffle/contract'); const ReviewStorageArtifact = require('./contracts/ReviewStorage.json'); const { logAddedReview } = require('./reviewLogger'); // external module where I write to database. const providerLink = 'wss://providerLink.org'; // Enable auto reconnection const options = { reconnect: { auto: true, delay: 1000, // ms maxAttempts: 5, onTimeout: false } }; // Connect let provider, web3; provider = new Web3.providers.WebsocketProvider(providerLink, options); web3 = new Web3(provider); provider.on('connect', init); provider.on('error', e => console.log('WS Error', e)); provider.on('end', e => { console.log(e); console.log('WS closed'); }); // Connect to instance and listen event function init() { const ReviewStorage = TruffleContract(ReviewStorageArtifact); ReviewStorage.setProvider(web3.currentProvider); console.log('Trying to conntect weeb3'); ReviewStorage.deployed() .then(instance => { console.log('Found instance'); instance.ReviewAdded() // Listen to ReviewAdded events. .on('data', (event) => logAddedReview(event, instance)) .on('error', console.error); }) .catch(console.error); }
Here’s the output how I noticed the regular reconnections. Notice there are no outputs from .on('error')
or .on('end')
:
Why could this be happening? Might it be something on the provider side? When I connect to Infura Rinkeby, for example, there are no reconnections taking place. Thanks.
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