primus-rooms-metroplex-adapter

primus-rooms-metroplex-adapter

Adapter for primus-room

• Backed by redis
• Depends on metroplex & omega-supreme
• Sets expired keys, so it can gracefully recover if a server goes down
• Uses scan and sscan to avoid blocking the server for large datasets

Installation

npm install --save primus-rooms-metroplex-adapter

const PrimusRoomsMetroplexAdapter = require('primus-rooms-metroplex-adapter')

// initialize primus with required plugins

const primus = new Primus(server, {
  transformer: 'engine.io',
  middleware: omegaSupremeRoomsMiddleware(),
  redis
})

primus.plugin('omega-supreme', omegaSupreme)
primus.plugin('metroplex', metroplex)
primus.plugin('rooms', primusRooms)

// configure & initialize adapter

const roomsAdapter = new PrimusRoomsMetroplexAdapter(redis, primus)
primus.adapter = roomsAdapter
primus._rooms.adapter = roomsAdapter // apparently a necessary hack
roomsAdapter.initialize()

Redis Data Schema

Key	Type	Values
room_manager:rooms:$serverId_$instanceId:$room	set	$sparkId

• Used for finding all of the sparks belonging to a room
• TTL is refreshed periodically, similar to metroplex's expiration refresh algorithm
• Includes the $serverId so that it can expire if the server goes down

Key	Type	Values
room_manager:sparks:$sparkId	set	$roomId

• Used for finding the rooms a given spark id belongs to
• TTL is refreshed each time a heartbeat event is received from a spark