redis-pubsub-hook

Redis pubsub for communicating other nodes
Using node-redis and redis-cluster client connection driver by default.

Installation

npm install redis-pubsub-hook
# or use yarn
yarn add redis-pubsub-hook

Usage

Basic Usage

const { RedisPubSub } = require('redis-pubsub-hook')
const WebSocket = require('ws')

const wss = new WebSocket.Server({ port: 8080 })

// Create redis connection on every server
const pubsub = new RedisPubSub({
  redis: 'redis://localhost:6379' // or `redis://localhost:6379,redis://localhost:6380` cluster
})

// Create self hook
pubsub.setHook('sessions', () => wss.clients.map((socket) => socket.session))

wss.on('connection', async function connection(socket, req) {
  socket.session = req.session

  // Collect all server nodes' responses
  const sessionsList = await pubsub.request('sessions')
})

process.on('SIGINT', () => pubsub.quit())

Namespace Usage

const { NamespacePubSub } = require('redis-pubsub-hook')
const WebSocket = require('ws')

const wss = new WebSocket.Server({ port: 8080 })

// Create redis connection on every server
const namespacePubSub = new NamespacePubSub({
  redis: 'redis://localhost:6379' // or `redis://localhost:6379,redis://localhost:6380` cluster
})

wss.on('connection', async function connection(socket, req) {
  const { namespace } = req.query
  socket.session = req.session

  const pubsub = namespacePubSub.register(namespace)

  pubsub.setHook('sessions', () => wss.clients.map((socket) => socket.session))

  socket.on('close', async () => {
    // Collect matching namespace sockets' sessions
    const sessionsList = await pubsub.request('sessions')
    const sessionCount = sessionsList.reduce((aSessions, bSessions) => aSessions.length + bSessions.length)

    if (!sessionCount) {
      // Detect all sockets in namespace had been closed
      namespacePubSub.remove(namespace)
    }
  })
})

process.on('SIGINT', () => namespacePubSub.quit())

RedisPubSub

Options

pub

Redis Client instance

sub

Redis Client instance

redis

The config for creating Redis Client

uid

The uid of this pubsub

• Type: string
• Default: uuid()

hooks

• Type: {[name: string]: Function}

createClient

• Type: (config: any) => RedisClient | RedisCluster
• Default: RedisPubSub.defaultCreateClient

getNumSub

• Type: (channel: string, pub: RedisClient | RedisCluster) => Promise<number>
• Default: RedisPubSub.defaultGetNumSub

timeout

• Type: number
• Default: 3000

responseChannel

• Type: string
• Default: RequestChannel

requestChannel

• Type: string
• Default: ResponseChannel

Contributing

• Fork it!
• Create your new branch:
  git checkout -b feature-new or git checkout -b fix-which-bug
• Start your magic work now
• Make sure npm test passes
• Commit your changes:
  git commit -am 'feat: some description (close #123)' or git commit -am 'fix: some description (fix #123)'
• Push to the branch: git push
• Submit a pull request :)

Authors

This library is written and maintained by imcuttle, [email protected].

License

MIT - imcuttle 🐟