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require 'set'
require 'faye/websocket'
require 'celluloid'
Celluloid::Actor[:worker_pool] = ActionCable::Worker.pool(size: 100)
module ActionCable
class Server
class_attribute :registered_channels
self.registered_channels = Set.new
class << self
def register_channels(*channel_classes)
self.registered_channels += channel_classes
end
def call(env)
new(env).process
end
end
def initialize(env)
@env = env
end
def process
if Faye::WebSocket.websocket?(@env)
@subscriptions = {}
@websocket = Faye::WebSocket.new(@env)
@websocket.on(:message) do |event|
message = event.data
Celluloid::Actor[:worker_pool].async.received_data(self, message) if message.is_a?(String)
end
@websocket.on(:close) do |event|
Celluloid::Actor[:worker_pool].async.cleanup_subscriptions(self)
end
@websocket.rack_response
else
invalid_request
end
end
def received_data(data)
data = ActiveSupport::JSON.decode data
case data['action']
when 'subscribe'
subscribe_channel(data)
when 'unsubscribe'
unsubscribe_channel(data)
when 'message'
process_message(data)
end
end
def cleanup_subscriptions
@subscriptions.each do |id, channel|
channel.unsubscribe
end
end
def broadcast(data)
@websocket.send data
end
private
def subscribe_channel(data)
id_key = data['identifier']
id_options = ActiveSupport::JSON.decode(id_key).with_indifferent_access
subscription_klass = registered_channels.detect { |channel_klass| channel_klass.find_name == id_options[:channel] }
if subscription_klass
@subscriptions[id_key] = subscription_klass.new(self, id_key, id_options)
else
# No channel found
end
end
def process_message(message)
id_key = message['identifier']
if @subscriptions[id_key]
@subscriptions[id_key].receive(ActiveSupport::JSON.decode message['data'])
end
end
def unsubscribe_channel(data)
id_key = data['identifier']
@subscriptions[id_key].unsubscribe
@subscriptions.delete(id_key)
end
def invalid_request
[404, {'Content-Type' => 'text/plain'}, ['Page not found']]
end
end
end
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