generator-ngstack/app/templates/client/components/socket(socketio)/socket.service(coffee).coffee

Based on DaftMonk generator-angular-fullstack, this is a custom mean stack yeoman generator

# global io

'use strict'

(->

  ### @ngInject ###
  socket = (socketFactory) ->
    # socket.io now auto-configures its connection when we omit a connection url
    ioSocket = io '',
      # Send auth token on connection, you will need to DI the Auth service above
      # 'query': 'token=' + Auth.getToken()
      path: '/socket.io-client'

    socket = socketFactory ioSocket: ioSocket

    socket: socket

    ###
    Register listeners to sync an array with updates on a model

    Takes the array we want to sync, the model name that socket updates are sent from,
    and an optional callback function after new items are updated.

    @param {String} modelName
    @param {Array} array
    @param {Function} callback
    ###
    syncUpdates: (modelName, array, callback) ->

      ###
      Syncs item creation/updates on 'model:save'
      ###
      socket.on modelName + ':save', (item) ->
        oldItem = _.find array,
          _id: item._id

        index = array.indexOf oldItem
        event = 'created'

        # replace oldItem if it exists
        # otherwise just add item to the collection
        if oldItem
          array.splice index, 1, item
          event = 'updated'
        else
          array.push item

        callback? event, item, array

      ###
      Syncs removed items on 'model:remove'
      ###
      socket.on modelName + ':remove', (item) ->
        event = 'deleted'
        _.remove array,
          _id: item._id

        callback? event, item, array

    ###
    Removes listeners for a models updates on the socket

    @param modelName
    ###
    unsyncUpdates: (modelName) ->
      socket.removeAllListeners modelName + ':save'
      socket.removeAllListeners modelName + ':remove'

  socket
    .$inject = ['socketFactory']

  angular
    .module '<%= scriptAppName %>'
    .factory 'socket', socket

)()