EventCapture library

This library wraps the blockchain event capture on-flight, so that it's possible:

• to listen to events, calling a specific handler for each of them when they occur (as ethers.js provides it)
• to look back to events a few blocks later (20 blocks by default) in order to detect some events that could have been missed by the on-flight (usually as a consequence of a chain reorganization)
• to look back to events again a few blocks later in order to detect some events that have been captured and then, been cancelled (usually as a consequence of a chain reorganization)

Use it

Instead of subscribing directly to the events of a contracts using the on method, create a new EventWrapper instance.

Installation

npm install @bosonprotocol/eventcapture

YOUR CODE BEFORE

contract.on(eventName, listener)

YOUR CODE AFTER

  new EventWrapper(
    contract,
    eventName,
    listener,
    onCancelledTransactionHandler,
    new EventStore())

Test it

Unit tests

npm run test

Integration tests

Be sure the .env file is defining the JSON_RPC_URL

JSON_RPC_PROVIDER=xxxxxxx

Then run the example

npm run example

Build the library

npm run build

Publish the library

npm publish