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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. Should not be used directly by the user.
class Subscriptions
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
subscription_klass = connection.server.channel_classes[id_options[:channel]]
if subscription_klass
subscriptions[id_key] ||= subscription_klass.new(connection, id_key, id_options)
else
logger.error "Subscription class not found (#{data.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
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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