Class: Thrift::AMQPServer

Inherits:
BaseServer
  • Object
show all
Defined in:
lib/thrift/amqp/server.rb

Constant Summary collapse

DEFAULT_TIMEOUT =

15s

15_000

Instance Method Summary collapse

Constructor Details

#initialize(processor, iprot_factory, oprot_factory = nil, opts = {}) ⇒ AMQPServer

Returns a new instance of AMQPServer.



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# File 'lib/thrift/amqp/server.rb', line 13

def initialize(processor, iprot_factory, oprot_factory = nil, opts = {})
  @processor = processor
  @iprot_factory = iprot_factory
  @oprot_factory = oprot_factory || iprot_factory

  @queue_name = opts[:queue_name]
  @amqp_uri = opts[:amqp_uri]
  @routing_key = opts[:routing_key]
  @exchange_name = opts[:exchange_name]
  @prefetch = (ENV['QOS_SIZE'] || opts[:prefetch]).to_i
  @timeout = opts[:timeout] ? opts[:timeout] * 1000 : DEFAULT_TIMEOUT
  @consumer_tag = opts[:consumer_tag]
  @fetching_disabled = ENV['RABBITMQ_QOS'] == '0'
  @queue_declare_args = opts[:queue_declare_args] || { durable: true }
end

Instance Method Details

#handle(delivery_info, properties, payload) ⇒ Object 



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# File 'lib/thrift/amqp/server.rb', line 29

def handle(delivery_info, properties, payload)
  input = StringIO.new payload
  out = StringIO.new
  transport = IOStreamTransport.new input, out
  protocol = @iprot_factory.get_protocol transport

  begin
    @processor.process protocol, protocol

    if out.length > 0
      out.rewind
      @channel.default_exchange.publish(
        out.read(out.length),
        routing_key: properties.reply_to
      )
    end
  rescue => e
    LOGGER.error("Processor failure #{e}")
  end
end

#serve ⇒ Object 



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# File 'lib/thrift/amqp/server.rb', line 50

def serve
  @conn = Bunny.new(@amqp_uri, continuation_timeout: @timeout * 1000)

  @conn.start
  @channel = @conn.create_channel(nil, @prefetch == 0 ? 1 : @prefetch)

  exchange = @channel.direct(@exchange_name)
  queue = @channel.queue(@queue_name, @queue_declare_args)
  queue.bind exchange, routing_key: @routing_key
  @consumer_tag ||= @channel.generate_consumer_tag

  @channel.prefetch @prefetch

  loop do
    if @fetching_disabled
      LOGGER.info("Fetching disabled")
      sleep @timeout
      next
    end

    LOGGER.info("Fetching message from #{@queue_name}")
    queue.subscribe(
      manual_ack: true,
      block: true,
      consumer_tag: @consumer_tag
    ) do |delivery_info, properties, payload|
      begin
        if @timeout
          begin
            Timeout.timeout(@timeout) do
              handle(delivery_info, properties, payload)
            end
          rescue Timeout::Error
            LOGGER.info("Timeout raised")
          end
        else
          handle delivery_info, properties, payload
        end
      rescue => e
        LOGGER.info("Error happened: #{e}")
      end
      @channel.acknowledge(delivery_info.delivery_tag, false)
    end
  end
rescue Bunny::TCPConnectionFailedForAllHosts, Bunny::ConnectionClosedError
  LOGGER.error("Can't establish the connection")
  sleep 5

  retry
end