Class: Legion::Extensions::Actors::Subscription

Inherits:
Object
  • Object
show all
Extended by:
Dsl
Includes:
Concurrent::Async, Base, Helpers::Transport
Defined in:
lib/legion/extensions/actors/subscription.rb

Constant Summary

Constants included from Helpers::Base

Helpers::Base::NAMESPACE_BOUNDARIES

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Dsl

define_dsl_accessor

Methods included from Helpers::Base

#actor_class, #actor_const, #actor_name, #amqp_prefix, #calling_class, #calling_class_array, #from_json, #full_path, #lex_class, #lex_const, #lex_name, #lex_slug, #log_tag, #normalize, #runner_class, #runner_const, #runner_name, #segments, #settings_path, #table_prefix, #to_dotted_hash

Methods included from Base

#args, #check_subtask?, #enabled?, #function, #generate_task?, included, #manual, #remote_invocable?, #runner, #use_runner?

Methods included from Helpers::Lex

#default_settings, included, #runner_desc

Methods included from Helpers::Task

#generate_task_id, #generate_task_log, #task_update

Methods included from Helpers::Logger

#handle_runner_exception

Methods included from Helpers::Secret

reset_identity!, resolve_identity!, #secret

Methods included from Helpers::Core

#find_setting

Constructor Details

#initialize(**_options) ⇒ Subscription

Returns a new instance of Subscription.



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# File 'lib/legion/extensions/actors/subscription.rb', line 33

def initialize(**_options)
  super()
  @queue = queue.new
  @queue.channel.prefetch(prefetch) if defined? prefetch
rescue StandardError => e
  handle_exception(e, level: :fatal)
end

Class Method Details

.pattern(routing_key = nil) ⇒ Object 



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# File 'lib/legion/extensions/actors/subscription.rb', line 27

def self.pattern(routing_key = nil)
  return routing_key_hint unless routing_key

  routing_key_hint(routing_key)
end

Instance Method Details

#activate ⇒ Object 



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# File 'lib/legion/extensions/actors/subscription.rb', line 108

def activate
  unless @consumer
    log.warn "[Subscription] skipping activate for #{lex_name}/#{runner_name}: no consumer (prepare failed?)"
    return
  end
  @queue.subscribe_with(@consumer)
  log.info "[Subscription] activated: #{lex_name}/#{runner_name} (consumer registered)"
end

#cancel ⇒ Object 



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# File 'lib/legion/extensions/actors/subscription.rb', line 58

def cancel
  return true unless @queue.channel.active

  log.debug "Closing subscription to #{@queue.name}"
  @consumer.cancel
  @queue.channel.close
  true
end

#create_queue ⇒ Object 



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# File 'lib/legion/extensions/actors/subscription.rb', line 41

def create_queue
  queues.const_set(actor_const, Class.new(Legion::Transport::Queue))
  exchange_object = default_exchange.new
  queue_object = Kernel.const_get(queue_string).new

  queue_object.bind(exchange_object, routing_key: "#{amqp_prefix}.runners.#{runner_name}.#")
end

#find_function(message = {}) ⇒ Object 



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# File 'lib/legion/extensions/actors/subscription.rb', line 152

def find_function(message = {})
  return runner_function if actor_class.method_defined?(:runner_function, false)
  return function if actor_class.method_defined?(:function, false)
  return action if actor_class.method_defined?(:action, false)
  return message[:function] if message.key? :function

  function
end

#include_metadata_in_message? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/legion/extensions/actors/subscription.rb', line 117

def include_metadata_in_message?
  true
end

#prepare ⇒ Object

rubocop:disable Metrics/AbcSize



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# File 'lib/legion/extensions/actors/subscription.rb', line 67

def prepare # rubocop:disable Metrics/AbcSize
  @queue = queue.new
  @queue.channel.prefetch(prefetch) if defined? prefetch
  consumer_tag = "#{Legion::Settings[:client][:name]}_#{lex_name}_#{runner_name}_#{SecureRandom.uuid}"
  @consumer = Bunny::Consumer.new(@queue.channel, @queue, consumer_tag, false, false)
  @consumer.on_delivery do |delivery_info, metadata, payload|
    fn = nil
    message = process_message(payload, metadata, delivery_info)
    fn = find_function(message)
    log.debug "[Subscription] message received: #{lex_name}/#{fn}" if defined?(log)

    affinity_result = check_region_affinity(message)
    if affinity_result == :reject
      log.warn '[Subscription] nack: region affinity mismatch'
      @queue.reject(delivery_info.delivery_tag) if manual_ack
      next
    end

    record_cross_region_metric(message) if affinity_result == :remote

    if use_runner?
      dispatch_runner(message, runner_class, fn, check_subtask?, generate_task?)
    else
      runner_class.send(fn, **message)
    end
    @queue.acknowledge(delivery_info.delivery_tag) if manual_ack

    cancel if Legion::Settings[:client][:shutting_down]
  rescue UnrecoverableMessageError => e
    handle_exception(e, lex: lex_name, fn: fn, routing_key: delivery_info.routing_key)
    log.warn "[Subscription] dead-lettering unrecoverable message for #{lex_name}/#{fn}: #{e.message}"
    @queue.reject(delivery_info.delivery_tag, requeue: false) if manual_ack
  rescue StandardError => e
    handle_exception(e, lex: lex_name, fn: fn, routing_key: delivery_info.routing_key)
    reject_or_retry(delivery_info, metadata, payload) if manual_ack
  end
  log.info "[Subscription] prepared: #{lex_name}/#{runner_name}"
rescue StandardError => e
  handle_exception(e, level: :fatal)
end

#process_message(message, metadata, delivery_info) ⇒ Object

rubocop:disable Metrics/CyclomaticComplexity,Metrics/PerceivedComplexity



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# File 'lib/legion/extensions/actors/subscription.rb', line 121

def process_message(message, metadata, delivery_info) # rubocop:disable Metrics/CyclomaticComplexity,Metrics/PerceivedComplexity
  payload = if metadata.content_encoding && metadata.content_encoding == 'encrypted/cs'
              headers = metadata.headers || {}
              iv = headers['iv'] || headers[:iv]
              raise UnrecoverableMessageError, "encrypted/cs message missing iv header (#{lex_name}/#{runner_name})" if iv.nil?

              Legion::Crypt.decrypt(message, iv)
            elsif metadata.content_encoding && metadata.content_encoding == 'encrypted/pk'
              Legion::Crypt.decrypt_from_keypair(metadata.headers[:public_key], message)
            else
              message
            end

  message = if metadata.content_type == 'application/json'
              Legion::JSON.load(payload)
            else
              { value: payload }
            end
  if include_metadata_in_message?
    message = message.merge(metadata.headers.transform_keys(&:to_sym)) unless metadata.headers.nil?
    message[:routing_key] = delivery_info[:routing_key]
  end

  message[:message_id] ||= metadata.message_id if metadata.respond_to?(:message_id) && metadata.message_id
  message[:correlation_id] ||= metadata.correlation_id if metadata.respond_to?(:correlation_id) && metadata.correlation_id

  message[:timestamp] = (message[:timestamp_in_ms] / 1000).round if message.key?(:timestamp_in_ms) && !message.key?(:timestamp)
  message[:datetime] = Time.at(message[:timestamp].to_i).to_datetime.to_s if message.key?(:timestamp)
  message
end

#queue ⇒ Object 



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# File 'lib/legion/extensions/actors/subscription.rb', line 49

def queue
  create_queue unless queues.const_defined?(actor_const, false)
  queues.const_get(actor_const, false)
end

#queue_string ⇒ Object 



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# File 'lib/legion/extensions/actors/subscription.rb', line 54

def queue_string
  @queue_string ||= "#{queues}::#{actor_const}"
end

#subscribe ⇒ Object

rubocop:disable Metrics/AbcSize



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# File 'lib/legion/extensions/actors/subscription.rb', line 161

def subscribe # rubocop:disable Metrics/AbcSize
  log.info "[Subscription] subscribing: #{lex_name}/#{runner_name}"
  sleep(delay_start) if delay_start.positive?
  consumer_tag = "#{Legion::Settings[:client][:name]}_#{lex_name}_#{runner_name}_#{SecureRandom.uuid}"
  on_cancellation = block { cancel }

  @consumer = @queue.subscribe(manual_ack: manual_ack, block: false, consumer_tag: consumer_tag, on_cancellation: on_cancellation) do |*rmq_message|
    delivery_info = nil
    metadata = nil
    payload = nil
    fn = nil

    delivery_info = rmq_message.first
    metadata = rmq_message.last
    payload = rmq_message.pop
    message = process_message(payload, metadata, delivery_info)
    fn = find_function(message)
    log.debug "[Subscription] message received: #{lex_name}/#{fn}" if defined?(log)

    affinity_result = check_region_affinity(message)
    if affinity_result == :reject
      log.warn "[Subscription] nack: region affinity mismatch region=#{message[:region]} affinity=#{message[:region_affinity]}"
      @queue.reject(delivery_info.delivery_tag) if manual_ack
      next
    end

    if affinity_result == :remote
      log.debug 'Processing remote-region message ' \
                "(region=#{message[:region]}, affinity=#{message[:region_affinity]})"
      record_cross_region_metric(message)
    end

    if use_runner?
      dispatch_runner(message, runner_class, fn, check_subtask?, generate_task?)
    else
      runner_class.send(fn, **message)
    end
    @queue.acknowledge(delivery_info.delivery_tag) if manual_ack

    cancel if Legion::Settings[:client][:shutting_down]
  rescue UnrecoverableMessageError => e
    handle_exception(e, lex: lex_name, fn: fn)
    log.warn "[Subscription] dead-lettering unrecoverable message for #{lex_name}/#{fn}: #{e.message}"
    @queue.reject(delivery_info.delivery_tag, requeue: false) if manual_ack && delivery_info
  rescue StandardError => e
    handle_exception(e)
    log.warn "[Subscription] retry-or-dlq for #{lex_name}/#{fn}"
    reject_or_retry(delivery_info, metadata, payload) if manual_ack && delivery_info
  end
  log.info "[Subscription] subscribed: #{lex_name}/#{runner_name} (consumer registered)" if defined?(log)
end