# 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](https://docs.ethers.io/v5/api/contract/contract/#Contract-on))
- 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](https://docs.ethers.io/v5/api/contract/contract/#Contract-on), 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
```

Wrap event capture to fix missed events after a chain reorganization. 

@bosonprotocol/eventcapture

Wrap event capture to fix missed events after a chain reorganization

bigerjot

reecejohnson

bosonprotocoladmin

damir-b

dlfurrer

levalleuxludo

dohaki_boson

marius_boson

krzysztofpaliga

albertfolch-redeemeum

eventcapture

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@bosonprotocol/eventcapture

EventCapture library

Use it

Installation

YOUR CODE BEFORE

YOUR CODE AFTER

Test it

Unit tests

Integration tests

Build the library

Publish the library

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