stf-DeviceFarmer/res/app/components/stf/socket/socket-service.js

var io = require('socket.io')

module.exports =
  function SocketFactory($rootScope, VersionUpdateService, AppState) {
    var websocketUrl = AppState.config.websocketUrl || ''

    var socket = io(websocketUrl, {
      reconnection: false, transports: ['websocket']
    })

    socket.scoped = function ($scope) {
      var listeners = []

      $scope.$on('$destroy', function () {
        listeners.forEach(function (listener) {
          socket.removeListener(listener.event, listener.handler)
        })
      })

      return {
        on: function (event, handler) {
          listeners.push({
            event: event, handler: handler
          })
          socket.on(event, handler)
          return this
        }
      }
    }

    socket.on('outdated', function () {
      VersionUpdateService.open()
    })

    socket.on('socket.ip', function (ip) {
      $rootScope.$apply(function () {
        socket.ip = ip
      })
    })

    return socket
  }