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require 'set'
module ActionCable
class Server < Cramp::Websocket
on_start :initialize_subscriptions
on_data :received_data
on_finish :cleanup_subscriptions
class_attribute :registered_channels
self.registered_channels = Set.new
class << self
def register_channels(*channel_classes)
self.registered_channels += channel_classes
end
end
def initialize_subscriptions
@subscriptions = {}
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)
render 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 do |channel_klass|
channel_klass.channel_name == id_options[:channel] && channel_klass.matches?(id_options)
end
if subscription_klass
@subscriptions[id_key] = subscription_klass.new(self, id_key, id_options)
@subscriptions[id_key].subscribe
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
end
end
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