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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
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