Use redis_connector to create redis connections for both subscriptions and broadcasts

Author: lifo

actioncable/lib/action_cable/subscription_adapter/redis.rb

@@ -33,7 +33,7 @@ def shutdown
       end
 
       def redis_connection_for_subscriptions
-        ::Redis.new(@server.config.cable)
+        redis_connection
       end
 
       private
@@ -43,10 +43,14 @@ def listener
 
         def redis_connection_for_broadcasts
           @redis_connection_for_broadcasts || @server.mutex.synchronize do
-            @redis_connection_for_broadcasts ||= self.class.redis_connector.call(@server.config.cable)
+            @redis_connection_for_broadcasts ||= redis_connection
           end
         end
 
+        def redis_connection
+          self.class.redis_connector.call(@server.config.cable)
+        end
+
         class Listener < SubscriberMap
           def initialize(adapter)
             super()