Class: Freddy::Producers::SendAndWaitResponseProducer

Inherits:
Object
  • Object
show all
Defined in:
lib/freddy/producers/send_and_wait_response_producer.rb

Constant Summary collapse

CONTENT_TYPE = 
'application/json'

Instance Method Summary collapse

Constructor Details

#initialize(channel, logger) ⇒ SendAndWaitResponseProducer 



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# File 'lib/freddy/producers/send_and_wait_response_producer.rb', line 8

def initialize(channel, logger)
  @logger = logger
  @channel = channel

  @request_manager = RequestManager.new(@logger)

  @exchange = @channel.default_exchange

  @channel.on_no_route do |correlation_id|
    @request_manager.no_route(correlation_id)
  end

  @response_queue = @channel.queue('', exclusive: true)

  @response_consumer = Consumers::ResponseConsumer.new(@logger)
  @response_consumer.consume(@channel, @response_queue, &method(:handle_response))
end

Instance Method Details

#handle_response(delivery) ⇒ Object 



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# File 'lib/freddy/producers/send_and_wait_response_producer.rb', line 61

def handle_response(delivery)
  correlation_id = delivery.correlation_id

  if (request = @request_manager.delete(correlation_id))
    process_response(request, delivery)
  else
    message = "Got rpc response for correlation_id #{correlation_id} "\
              'but there is no requester'
    @logger.warn message
  end
end

#on_timeout(correlation_id, routing_key, timeout_in_seconds, span) ⇒ Object 



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# File 'lib/freddy/producers/send_and_wait_response_producer.rb', line 85

def on_timeout(correlation_id, routing_key, timeout_in_seconds, span)
  proc do
    @logger.warn "Request timed out waiting response from #{routing_key}"\
                 ", correlation id #{correlation_id}, timeout #{timeout_in_seconds}s"

    @request_manager.delete(correlation_id)
    span.add_event('timeout')
    span.status = OpenTelemetry::Trace::Status.error("Timed out waiting response from #{routing_key}")
    span.finish
  end
end

#process_response(request, delivery) ⇒ Object 



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# File 'lib/freddy/producers/send_and_wait_response_producer.rb', line 73

def process_response(request, delivery)
  @logger.debug "Got response for request to #{request[:destination]} "\
                "with correlation_id #{delivery.correlation_id}"
  request[:callback].call(delivery.payload, delivery)
rescue InvalidRequestError => e
  request[:span].record_exception(e)
  request[:span].status = OpenTelemetry::Trace::Status.error
  raise e
ensure
  request[:span].finish
end

#produce(routing_key, payload, timeout_in_seconds:, delete_on_timeout:, **properties) ⇒ Object 



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# File 'lib/freddy/producers/send_and_wait_response_producer.rb', line 26

def produce(routing_key, payload, timeout_in_seconds:, delete_on_timeout:, **properties)
  correlation_id = SecureRandom.uuid

  span = Tracing.span_for_produce(
    @exchange,
    routing_key,
    payload,
    correlation_id: correlation_id, timeout_in_seconds: timeout_in_seconds
  )

  container = SyncResponseContainer.new(
    on_timeout(correlation_id, routing_key, timeout_in_seconds, span)
  )

  @request_manager.store(correlation_id,
                         callback: container,
                         span: span,
                         destination: routing_key)

  properties[:expiration] = (timeout_in_seconds * 1000).to_i if delete_on_timeout

  properties = properties.merge(
    routing_key: routing_key, content_type: CONTENT_TYPE,
    correlation_id: correlation_id, reply_to: @response_queue.name,
    mandatory: true, type: 'request'
  )
  Tracing.inject_tracing_information_to_properties!(properties)

  # Connection adapters handle thread safety for #publish themselves. No
  # need to lock this.
  @exchange.publish Payload.dump(payload), properties.dup

  container.wait_for_response(timeout_in_seconds)
end