how to list rooms on socket.io nodejs server

Question

after progress on the question how to create socket.io multicast groups, I found making rooms a great way to do what I needed.

However, it would be great to know about all the rooms, without an extra data-structure.

Is it possible to get a list of all rooms on the server from the server socket?

Answer 1

The short answer:

io.sockets.adapter.rooms 

I analysed io:

I got the following output:

{ server:     { stack:        [ [Object],         [Object],         [Object],         [Object],         [Object],         [Object] ],      connections: 3,      allowHalfOpen: true,      watcher: { host: [Circular], callback: [Function] },      _events:        { request: [Function],         connection: [Function: connectionListener],         listening: [Object],         upgrade: [Object] },      httpAllowHalfOpen: false,      cache: {},      settings: { home: '/', env: 'development', hints: true },      redirects: {},      isCallbacks: {},      _locals: { settings: [Object], app: [Circular] },      dynamicViewHelpers: {},      errorHandlers: [],      route: '/',      routes:        { app: [Circular],         routes: [Object],         params: {},         _params: [],         middleware: [Function] },      router: [Getter],      __usedRouter: true,      type: 'tcp4',      fd: 7 },   namespaces:     { '':        { manager: [Circular],         name: '',         sockets: [Object],         auth: false,         flags: [Object],         _events: [Object] } },   sockets:     { manager: [Circular],      name: '',      sockets: { '210837319844898486': [Object] },      auth: false,      flags: { endpoint: '', exceptions: [] },      _events: { connection: [Function] } },   settings:     { origins: '*:*',      log: true,      store:        { options: undefined,         clients: [Object],         manager: [Circular] },      logger: { colors: true, level: 1 },      heartbeats: true,      resource: '/socket.io',      transports:        [ 'websocket',         'htmlfile',         'xhr-polling',         'jsonp-polling' ],      authorization: [Function],      'log level': 1,      'close timeout': 25,      'heartbeat timeout': 15,      'heartbeat interval': 20,      'polling duration': 20,      'flash policy server': true,      'flash policy port': 843,      'destroy upgrade': true,      'browser client': true,      'browser client minification': false,      'browser client etag': false,      'browser client handler': false,      'client store expiration': 15 },   handshaken:     { '210837319844898486':        { headers: [Object],         address: [Object],         time: 'Mon Jul 18 2011 00:53:27 GMT+0200 (CEST)',         xdomain: false,         secure: undefined,         PHPSESSID: '7qo6cht3q0rskhfes4eesb2d05' } },   connected: { '210837319844898486': true },   open: { '210837319844898486': true },   closed: {},   closedA: [],   rooms:     { '': [ '210837319844898486' ],      '/public-alfred': [ '210837319844898486' ] },   roomClients: { '210837319844898486': [ '': true, '/public-alfred': true ] },   oldListeners: [ [Function] ],   _events:     { 'set:origins': [Function],      'set:flash policy port': [Function],      'set:transports': [Function] } } 

after joining room "public-alfred" from a single client io.sockets.adapter.rooms contained:

 { '': [ '210837319844898486' ],          '/public-alfred': [ '210837319844898486' ] }