require "active_support/core_ext/hash/indifferent_access" module ActionCable module Connection # Collection class for all the channel subscriptions established on a given connection. Responsible for routing incoming commands that arrive on # the connection to the proper channel. class Subscriptions # :nodoc: def initialize(connection) @connection = connection @subscriptions = {} end def execute_command(data) case data["command"] when "subscribe" then add data when "unsubscribe" then remove data when "message" then perform_action data else logger.error "Received unrecognized command in #{data.inspect}" end rescue Exception => e logger.error "Could not execute command from (#{data.inspect}) [#{e.class} - #{e.message}]: #{e.backtrace.first(5).join(" | ")}" end def add(data) id_key = data["identifier"] id_options = ActiveSupport::JSON.decode(id_key).with_indifferent_access return if subscriptions.key?(id_key) subscription_klass = id_options[:channel].safe_constantize if subscription_klass && ActionCable::Channel::Base >= subscription_klass subscription = subscription_klass.new(connection, id_key, id_options) subscriptions[id_key] = subscription subscription.subscribe_to_channel else logger.error "Subscription class not found: #{id_options[:channel].inspect}" end end def remove(data) logger.info "Unsubscribing from channel: #{data['identifier']}" remove_subscription subscriptions[data["identifier"]] end def remove_subscription(subscription) subscription.unsubscribe_from_channel subscriptions.delete(subscription.identifier) end def perform_action(data) find(data).perform_action ActiveSupport::JSON.decode(data["data"]) end def identifiers subscriptions.keys end def unsubscribe_from_all subscriptions.each { |id, channel| remove_subscription(channel) } end # TODO Change this to private once we've dropped Ruby 2.2 support. # Workaround for Ruby 2.2 "private attribute?" warning. protected attr_reader :connection, :subscriptions private delegate :logger, to: :connection def find(data) if subscription = subscriptions[data["identifier"]] subscription else raise "Unable to find subscription with identifier: #{data['identifier']}" end end end end end