Bitfinex Sequence Number Audit Plugin for the Node.JS API

This plugin enables the sequence reporting flag upon connecting, and emits an error event upon receiving an invalid sequence number.

Note that the manager proxies the event as ws2:error. If subscribing on a socket instance (wsState.ev.on(...)) use the internal event name, otherwise use the manager name with manager.onWS(...).

Features

• Automatically enables sequence numbers on all connections
• Emits a ws2:error event in case of sequence number miss-match

Installation

npm i --save bfx-api-node-plugin-seq-audit

Quickstart & Example

const debug = require('debug')('bfx:api:plugins:seq-audit:example')
const { Manager, subscribe } = require('bfx-api-node-core')
const SeqAuditPlugin = require('../')

const SYMBOL = 'tBTCUSD'
const mgr = new Manager({
  transform: true,
  plugins: [SeqAuditPlugin()]
})

mgr.onWS('open', {}, () => debug('connection open'))

// Catch checksum errors
mgr.onWS('ws2:error', {}, (err) => {
  if (err.message.match(/invalid(.*)seq/)) {
    debug('recv invalid seq # error: %s', err.message)
  }
})

const wsState = mgr.openWS()

subscribe(wsState, 'trades', { symbol: SYMBOL })

Docs

For an executable example, see examples/usage.js

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request