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# frozen_string_literal: true
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:
prepend ChannelPrefix
@@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, default: ->(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, default: ->(config) { ::Redis.new(url: config[:url]) }
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 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.error "[ActionCable] Redis reconnect failed."
end
redis.on(:failed) do
@logger.error "[ActionCable] Redis connection has 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? && 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
end
end
end
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