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module ActionCable
module Channel
class Base
include Callbacks
include Redis
on_subscribe :start_periodic_timers
on_unsubscribe :stop_periodic_timers
on_unsubscribe :disconnect
attr_reader :params, :connection
delegate :log_info, :log_error, to: :connection
class_attribute :channel_name
class << self
def matches?(identifier)
raise "Please implement #{name}#matches? method"
end
def find_name
@name ||= channel_name || to_s.demodulize.underscore
end
end
def initialize(connection, channel_identifier, params = {})
@connection = connection
@channel_identifier = channel_identifier
@_active_periodic_timers = []
@params = params
connect
subscribe
end
def receive_data(data)
if authorized?
if respond_to?(:receive)
receive(data)
else
log_error "#{self.class.name} received data (#{data}) but #{self.class.name}#receive callback is not defined"
end
else
unauthorized
end
end
def subscribe
self.class.on_subscribe_callbacks.each do |callback|
send(callback)
end
end
def unsubscribe
self.class.on_unsubscribe_callbacks.each do |callback|
send(callback)
end
end
protected
# Override in subclasses
def authorized?
true
end
def unauthorized
log_error "Unauthorized access to #{self.class.name}"
end
def connect
# Override in subclasses
end
def disconnect
# Override in subclasses
end
def broadcast(data)
if authorized?
connection.broadcast({ identifier: @channel_identifier, message: data }.to_json)
else
unauthorized
end
end
def start_periodic_timers
self.class.periodic_timers.each do |callback, options|
@_active_periodic_timers << EventMachine::PeriodicTimer.new(options[:every]) do
worker_pool.async.run_periodic_timer(self, callback)
end
end
end
def stop_periodic_timers
@_active_periodic_timers.each {|t| t.cancel }
end
def worker_pool
connection.worker_pool
end
end
end
end
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