Separate connection and server classes

action_cable.gemspec

@@ -12,6 +12,7 @@ Gem::Specification.new do |s|
   s.add_dependency('activesupport', '>= 4.2.0')
   s.add_dependency('faye-websocket', '~> 0.9.2')
   s.add_dependency('celluloid', '~> 0.16.0')
+  s.add_dependency('em-hiredis', '~> 0.3.0')
 
   s.files = Dir['README', 'lib/**/*']
   s.has_rdoc = false

lib/action_cable.rb

@@ -7,10 +7,12 @@ require 'active_support'
 require 'active_support/json'
 require 'active_support/concern'
 require 'active_support/core_ext/hash/indifferent_access'
+require 'active_support/core_ext/module/delegation'
 require 'active_support/callbacks'
 
 require 'faye/websocket'
 require 'celluloid'
+require 'em-hiredis'
 
 require 'action_cable/engine' if defined?(Rails)
 
@@ -20,4 +22,6 @@ module ActionCable
   autoload :Channel, 'action_cable/channel'
   autoload :Worker, 'action_cable/worker'
   autoload :Server, 'action_cable/server'
+  autoload :Connection, 'action_cable/connection'
+  autoload :Connections, 'action_cable/connections'
 end

lib/action_cable/channel/redis.rb

@@ -6,11 +6,10 @@ module ActionCable
 
       included do
         on_unsubscribe :unsubscribe_from_redis_channels
+        delegate :pubsub, to: :connection
       end
 
       def subscribe_to(redis_channel, callback = nil)
-        raise "`ActionCable::Server.pubsub` class method is not defined" unless connection.class.respond_to?(:pubsub)
-
         callback ||= -> (message) { broadcast ActiveSupport::JSON.decode(message) }
         @_redis_channels ||= []
         @_redis_channels << [ redis_channel, callback ]
@@ -24,10 +23,6 @@ module ActionCable
             @_redis_channels.each { |channel, callback| pubsub.unsubscribe_proc(channel, callback) }
           end
         end
-
-        def pubsub
-          connection.class.pubsub
-        end
     end
 
   end

lib/action_cable/connection.rb

@@ -0,0 +1,133 @@
+module ActionCable
+  class Connection
+    PING_INTERVAL = 3
+
+    attr_reader :env, :server
+    delegate :worker_pool, :pubsub, :logger, to: :server
+
+    def initialize(server, env)
+      @server = server
+      @env = env
+      @accept_messages = false
+      @pending_messages = []
+    end
+
+    def process
+      if Faye::WebSocket.websocket?(@env)
+        @subscriptions = {}
+
+        @websocket = Faye::WebSocket.new(@env)
+
+        @websocket.on(:open) do |event|
+          broadcast_ping_timestamp
+          @ping_timer = EventMachine.add_periodic_timer(PING_INTERVAL) { broadcast_ping_timestamp }
+          worker_pool.async.invoke(self, :initialize_client)
+        end
+
+        @websocket.on(:message) do |event|
+          message = event.data
+
+          if message.is_a?(String)
+            if @accept_messages
+              worker_pool.async.invoke(self, :received_data, message)
+            else
+              @pending_messages << message
+            end
+          end
+        end
+
+        @websocket.on(:close) do |event|
+          worker_pool.async.invoke(self, :cleanup_subscriptions)
+          worker_pool.async.invoke(self, :disconnect) if respond_to?(:disconnect)
+
+          EventMachine.cancel_timer(@ping_timer) if @ping_timer
+        end
+
+        @websocket.rack_response
+      else
+        invalid_request
+      end
+    end
+
+    def received_data(data)
+      return unless websocket_alive?
+
+      data = ActiveSupport::JSON.decode data
+
+      case data['action']
+      when 'subscribe'
+        subscribe_channel(data)
+      when 'unsubscribe'
+        unsubscribe_channel(data)
+      when 'message'
+        process_message(data)
+      end
+    end
+
+    def cleanup_subscriptions
+      @subscriptions.each do |id, channel|
+        channel.unsubscribe
+      end
+    end
+
+    def broadcast(data)
+      logger.info "Sending data: #{data}"
+      @websocket.send data
+    end
+
+    def handle_exception
+      logger.error "[ActionCable] Closing connection"
+
+      @websocket.close
+    end
+
+    private
+      def initialize_client
+        connect if respond_to?(:connect)
+        @accept_messages = true
+
+        worker_pool.async.invoke(self, :received_data, @pending_messages.shift) until @pending_messages.empty?
+      end
+
+      def broadcast_ping_timestamp
+        broadcast({ identifier: '_ping', message: Time.now.to_i }.to_json)
+      end
+
+      def subscribe_channel(data)
+        id_key = data['identifier']
+        id_options = ActiveSupport::JSON.decode(id_key).with_indifferent_access
+
+        subscription_klass = server.registered_channels.detect { |channel_klass| channel_klass.find_name == id_options[:channel] }
+
+        if subscription_klass
+          logger.info "Subscribing to channel: #{id_key}"
+          @subscriptions[id_key] = subscription_klass.new(self, id_key, id_options)
+        else
+          logger.error "Unable to subscribe to channel: #{id_key}"
+        end
+      end
+
+      def process_message(message)
+        if @subscriptions[message['identifier']]
+          @subscriptions[message['identifier']].receive_data(ActiveSupport::JSON.decode message['data'])
+        else
+          logger.error "Unable to process message: #{message}"
+        end
+      end
+
+      def unsubscribe_channel(data)
+        logger.info "Unsubscribing from channel: #{data['identifier']}"
+        @subscriptions[data['identifier']].unsubscribe
+        @subscriptions.delete(data['identifier'])
+      end
+
+      def invalid_request
+        [404, {'Content-Type' => 'text/plain'}, ['Page not found']]
+      end
+
+      def websocket_alive?
+        @websocket && @websocket.ready_state == Faye::WebSocket::API::OPEN
+      end
+
+  end
+end

lib/action_cable/connections.rb

@@ -0,0 +1,17 @@
+module ActionCable
+  module Connections
+    class << self
+      def active
+      end
+
+      def where(identification)
+      end
+    end
+
+    def disconnect
+    end
+
+    def reconnect
+    end
+  end
+end

lib/action_cable/server.rb

@@ -1,157 +1,23 @@
 module ActionCable
   class Server
-    class_attribute :registered_channels
-    self.registered_channels = Set.new
-
-    class_attribute :worker_pool_size
-    self.worker_pool_size = 100
-
     cattr_accessor(:logger, instance_reader: true) { Rails.logger }
 
-    PING_INTERVAL = 3
+    attr_accessor :registered_channels, :worker_pool
 
-    class << self
-      def register_channels(*channel_classes)
-        self.registered_channels += channel_classes
-      end
-
-      def call(env)
-        new(env).process
-      end
-
-      def worker_pool
-        @worker_pool ||= ActionCable::Worker.pool(size: worker_pool_size)
-      end
+    def initialize(redis_config:, channels:, worker_pool_size: 100, connection: Connection)
+      @redis_config = redis_config
+      @registered_channels = Set.new(channels)
+      @worker_pool = ActionCable::Worker.pool(size: worker_pool_size)
+      @connection_class = connection
     end
 
-    attr_reader :env
-
-    def initialize(env)
-      @env = env
-      @accept_messages = false
-      @pending_messages = []
+    def call(env)
+      @connection_class.new(self, env).process
     end
 
-    def process
-      if Faye::WebSocket.websocket?(@env)
-        @subscriptions = {}
-
-        @websocket = Faye::WebSocket.new(@env)
-
-        @websocket.on(:open) do |event|
-          broadcast_ping_timestamp
-          @ping_timer = EventMachine.add_periodic_timer(PING_INTERVAL) { broadcast_ping_timestamp }
-          worker_pool.async.invoke(self, :initialize_client)
-        end
-
-        @websocket.on(:message) do |event|
-          message = event.data
-
-          if message.is_a?(String)
-            if @accept_messages
-              worker_pool.async.invoke(self, :received_data, message)
-            else
-              @pending_messages << message
-            end
-          end
-        end
-
-        @websocket.on(:close) do |event|
-          worker_pool.async.invoke(self, :cleanup_subscriptions)
-          worker_pool.async.invoke(self, :disconnect) if respond_to?(:disconnect)
-
-          EventMachine.cancel_timer(@ping_timer) if @ping_timer
-        end
-
-        @websocket.rack_response
-      else
-        invalid_request
-      end
+    def pubsub
+      @pubsub ||= EM::Hiredis.connect(@redis_config['url']).pubsub
     end
 
-    def received_data(data)
-      return unless websocket_alive?
-
-      data = ActiveSupport::JSON.decode data
-
-      case data['action']
-      when 'subscribe'
-        subscribe_channel(data)
-      when 'unsubscribe'
-        unsubscribe_channel(data)
-      when 'message'
-        process_message(data)
-      end
-    end
-
-    def cleanup_subscriptions
-      @subscriptions.each do |id, channel|
-        channel.unsubscribe
-      end
-    end
-
-    def broadcast(data)
-      logger.info "Sending data: #{data}"
-      @websocket.send data
-    end
-
-    def worker_pool
-      self.class.worker_pool
-    end
-
-    def handle_exception
-      logger.error "[ActionCable] Closing connection"
-
-      @websocket.close
-    end
-
-    private
-      def initialize_client
-        connect if respond_to?(:connect)
-        @accept_messages = true
-
-        worker_pool.async.invoke(self, :received_data, @pending_messages.shift) until @pending_messages.empty?
-      end
-
-      def broadcast_ping_timestamp
-        broadcast({ identifier: '_ping', message: Time.now.to_i }.to_json)
-      end
-
-      def subscribe_channel(data)
-        id_key = data['identifier']
-        id_options = ActiveSupport::JSON.decode(id_key).with_indifferent_access
-
-        subscription_klass = registered_channels.detect { |channel_klass| channel_klass.find_name == id_options[:channel] }
-
-        if subscription_klass
-          logger.info "Subscribing to channel: #{id_key}"
-          @subscriptions[id_key] = subscription_klass.new(self, id_key, id_options)
-        else
-          logger.error "Unable to subscribe to channel: #{id_key}"
-        end
-      end
-
-      def process_message(message)
-        if @subscriptions[message['identifier']]
-          @subscriptions[message['identifier']].receive_data(ActiveSupport::JSON.decode message['data'])
-        else
-          logger.error "Unable to process message: #{message}"
-        end
-      end
-
-      def unsubscribe_channel(data)
-        logger.info "Unsubscribing from channel: #{data['identifier']}"
-        @subscriptions[data['identifier']].unsubscribe
-        @subscriptions.delete(data['identifier'])
-      end
-
-      def invalid_request
-        [404, {'Content-Type' => 'text/plain'}, ['Page not found']]
-      end
-
-      def websocket_alive?
-        @websocket && @websocket.ready_state == Faye::WebSocket::API::OPEN
-      end
-
   end
 end