require 'thread' gem 'em-hiredis', '~> 0.3.0' gem 'redis', '~> 3.0' require 'em-hiredis' require 'redis' EventMachine.epoll if EventMachine.epoll? EventMachine.kqueue if EventMachine.kqueue? module ActionCable module SubscriptionAdapter class EventedRedis < Base # :nodoc: @@mutex = Mutex.new # Overwrite this factory method for EventMachine Redis connections if you want to use a different Redis connection library than EM::Hiredis. # This is needed, for example, when using Makara proxies for distributed Redis. cattr_accessor(:em_redis_connector) { ->(config) { EM::Hiredis.connect(config[:url]) } } # Overwrite this factory method for Redis connections if you want to use a different Redis connection library than Redis. # This is needed, for example, when using Makara proxies for distributed Redis. cattr_accessor(:redis_connector) { ->(config) { ::Redis.new(url: config[:url]) } } def initialize(*) super @redis_connection_for_broadcasts = @redis_connection_for_subscriptions = nil end def broadcast(channel, payload) redis_connection_for_broadcasts.publish(channel, payload) 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 def shutdown redis_connection_for_subscriptions.pubsub.close_connection @redis_connection_for_subscriptions = nil end private 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.info "[ActionCable] Redis reconnect failed." end end end 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 ensure_reactor_running return if EventMachine.reactor_running? @@mutex.synchronize do Thread.new { EventMachine.run } unless EventMachine.reactor_running? Thread.pass until EventMachine.reactor_running? end end end end end