1 files changed, 75 insertions, 0 deletions
diff --git a/actioncable/lib/action_cable/connection/subscriptions.rb b/actioncable/lib/action_cable/connection/subscriptions.rb
new file mode 100644
index 0000000000..6199db4898
--- /dev/null
+++ b/actioncable/lib/action_cable/connection/subscriptions.rb
@@ -0,0 +1,75 @@
+require 'active_support/core_ext/hash/indifferent_access'
+
+module ActionCable
+  module Connection
+    # Collection class for all the channel subscriptions established on a given connection. Responsible for routing incoming commands that arrive on
+    # the connection to the proper channel. Should not be used directly by the user.
+    class Subscriptions
+      def initialize(connection)
+        @connection = connection
+        @subscriptions = {}
+      end
+
+      def execute_command(data)
+        case data['command']
+        when 'subscribe'   then add data
+        when 'unsubscribe' then remove data
+        when 'message'     then perform_action data
+        else
+          logger.error "Received unrecognized command in #{data.inspect}"
+        end
+      rescue Exception => e
+        logger.error "Could not execute command from #{data.inspect}) [#{e.class} - #{e.message}]: #{e.backtrace.first(5).join(" | ")}"
+      end
+
+      def add(data)
+        id_key = data['identifier']
+        id_options = ActiveSupport::JSON.decode(id_key).with_indifferent_access
+
+        subscription_klass = connection.server.channel_classes[id_options[:channel]]
+
+        if subscription_klass
+          subscriptions[id_key] ||= subscription_klass.new(connection, id_key, id_options)
+        else
+          logger.error "Subscription class not found (#{data.inspect})"
+        end
+      end
+
+      def remove(data)
+        logger.info "Unsubscribing from channel: #{data['identifier']}"
+        remove_subscription subscriptions[data['identifier']]
+      end
+
+      def remove_subscription(subscription)
+        subscription.unsubscribe_from_channel
+        subscriptions.delete(subscription.identifier)
+      end
+
+      def perform_action(data)
+        find(data).perform_action ActiveSupport::JSON.decode(data['data'])
+      end
+
+
+      def identifiers
+        subscriptions.keys
+      end
+
+      def unsubscribe_from_all
+        subscriptions.each { |id, channel| channel.unsubscribe_from_channel }
+      end
+
+
+      private
+        attr_reader :connection, :subscriptions
+        delegate :logger, to: :connection
+
+        def find(data)
+          if subscription = subscriptions[data['identifier']]
+            subscription
+          else
+            raise "Unable to find subscription with identifier: #{data['identifier']}"
+          end
+        end
+    end
+  end
+end