Class: ActionCableClient

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/action_cable_client.rb,
lib/action_cable_client/message.rb,
lib/action_cable_client/version.rb,
lib/action_cable_client/message_factory.rb

Defined Under Namespace

Classes: Commands, Message, MessageFactory

Constant Summary collapse

VERSION = 
'1.0'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(uri, channel = '') ⇒ ActionCableClient

Returns a new instance of ActionCableClient.

Parameters:

  • uri (String) —

    • e.g.: ws://domain:port

  • channel (String) (defaults to: '') —

    • the name of the channel on the Rails server

    e.g.: RoomChannel



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# File 'lib/action_cable_client.rb', line 36

def initialize(uri, channel = '')
  @_channel_name = channel
  @_uri = uri
  @message_queue = []
  @subscribed = false

  @_message_factory = MessageFactory.new(channel)
  # NOTE:
  #   EventMachine::WebSocketClient
  #      https://github.com/mwylde/em-websocket-client/blob/master/lib/em-websocket-client.rb
  #   is a subclass of
  #      https://github.com/eventmachine/eventmachine/blob/master/lib/em/connection.rb
  @_websocket_client = EventMachine::WebSocketClient.connect(_uri)
end

Instance Attribute Details

#_channel_name ⇒ Object (readonly)

Returns the value of attribute _channel_name.



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# File 'lib/action_cable_client.rb', line 20

def _channel_name
  @_channel_name
end

#_message_factory ⇒ Object (readonly)

Returns the value of attribute _message_factory.



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# File 'lib/action_cable_client.rb', line 21

def _message_factory
  @_message_factory
end

#_uri ⇒ Object (readonly)

Returns the value of attribute _uri.



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# File 'lib/action_cable_client.rb', line 20

def _uri
  @_uri
end

#_websocket_client ⇒ Object (readonly)

Returns the value of attribute _websocket_client.



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# File 'lib/action_cable_client.rb', line 20

def _websocket_client
  @_websocket_client
end

#message_queue ⇒ Object

The queue should store entries in the format:

action, data 


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# File 'lib/action_cable_client.rb', line 24

def message_queue
  @message_queue
end

#subscribed ⇒ Object Also known as: subscribed?

The queue should store entries in the format:

action, data 


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# File 'lib/action_cable_client.rb', line 24

def subscribed
  @subscribed
end

Instance Method Details

#connected ⇒ Object

callback when the client connects to the server

Examples:

client = ActionCableClient.new(uri, 'RoomChannel')
client.connected do
  # do things after the client is connected to the server
end


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# File 'lib/action_cable_client.rb', line 91

def connected
  _websocket_client.callback do
    subscribe
    yield
  end
end

#perform(action, data) ⇒ Object

Parameters:

  • action (String) —

    • how the message is being sent

  • data (Hash) —

    • the message to be sent to the channel



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# File 'lib/action_cable_client.rb', line 53

def perform(action, data)
  message_queue.push([action, data])
end

#received(skip_pings = true) ⇒ Object

callback for received messages as well as what triggers depleting the message queue

Examples:

client = ActionCableClient.new(uri, 'RoomChannel')
client.received do |message|
  # the received message will be JSON
  puts message
end

Parameters:

  • skip_pings (Boolean) (defaults to: true) —

    • by default, messages

    with the identifier ‘_ping’ are skipped



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# File 'lib/action_cable_client.rb', line 69

def received(skip_pings = true)
  _websocket_client.stream do | message |
    string = message.data
    json = JSON.parse(string)

    if is_ping?(json)
      check_for_subscribe_confirmation(json) unless subscribed?
      yield(json) unless skip_pings
    else
      yield(json)
    end
    deplete_queue if subscribed?
  end
end