class ActionCable::SubscriptionAdapter::EventedRedis

def broadcast(channel, payload)
  redis_connection_for_broadcasts.publish(channel, payload)
end

def ensure_reactor_running
  return if EventMachine.reactor_running? && EventMachine.reactor_thread
  @@mutex.synchronize do
    Thread.new { EventMachine.run } unless EventMachine.reactor_running?
    Thread.pass until EventMachine.reactor_running? && EventMachine.reactor_thread
  end
end

def initialize(*)
  ActiveSupport::Deprecation.warn(<<-MSG.squish)
    The "evented_redis" subscription adapter is deprecated and
    will be removed in Rails 5.2. Please use the "redis" adapter
    instead.
  MSG
  super
  @redis_connection_for_broadcasts = @redis_connection_for_subscriptions = nil
end

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)
  end
end

def redis_connection_for_subscriptions
  ensure_reactor_running
  @redis_connection_for_subscriptions || @server.mutex.synchronize do
    @redis_connection_for_subscriptions ||= self.class.em_redis_connector.call(@server.config.cable).tap do |redis|
      redis.on(:reconnect_failed) do
        @logger.error "[ActionCable] Redis reconnect failed."
      end
      redis.on(:failed) do
        @logger.error "[ActionCable] Redis connection has failed."
      end
    end
  end
end

def shutdown
  redis_connection_for_subscriptions.pubsub.close_connection
  @redis_connection_for_subscriptions = nil
end

def subscribe(channel, message_callback, success_callback = nil)
  redis_connection_for_subscriptions.pubsub.subscribe(channel, &message_callback).tap do |result|
    result.callback { |reply| success_callback.call } if success_callback
  end
end

def unsubscribe(channel, message_callback)
  redis_connection_for_subscriptions.pubsub.unsubscribe_proc(channel, message_callback)
end