Class: Fluent::Rdkafka2Output

Inherits:
Output
  • Object
show all
Includes:
KafkaPluginUtil::SSLSettings, KafkaPluginUtil::SaslSettings
Defined in:
lib/fluent/plugin/out_rdkafka2.rb

Constant Summary

Constants included from KafkaPluginUtil::SSLSettings

KafkaPluginUtil::SSLSettings::DummyFormatter

Instance Method Summary collapse

Methods included from KafkaPluginUtil::SaslSettings

included

Methods included from KafkaPluginUtil::SSLSettings

included, #pickup_ssl_endpoint, #read_ssl_file

Constructor Details

#initialize ⇒ Rdkafka2Output

Returns a new instance of Rdkafka2Output.



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# File 'lib/fluent/plugin/out_rdkafka2.rb', line 102

def initialize
  super

  @producers = nil
  @producers_mutex = nil
  @shared_producer = nil
end

Instance Method Details

#build_config ⇒ Object 



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# File 'lib/fluent/plugin/out_rdkafka2.rb', line 163

def build_config
  config = {:"bootstrap.servers" => @brokers}

  if @ssl_ca_cert && @ssl_ca_cert[0]
    ssl = true
    config[:"ssl.ca.location"] = @ssl_ca_cert[0]
    config[:"ssl.certificate.location"] = @ssl_client_cert if @ssl_client_cert
    config[:"ssl.key.location"] = @ssl_client_cert_key if @ssl_client_cert_key
    config[:"ssl.key.password"] = @ssl_client_cert_key_password if @ssl_client_cert_key_password
  end

  if @principal
    sasl = true
    config[:"sasl.mechanisms"] = "GSSAPI"
    config[:"sasl.kerberos.principal"] = @principal
    config[:"sasl.kerberos.service.name"] = @service_name if @service_name
    config[:"sasl.kerberos.keytab"] = @keytab if @keytab
  end

  if ssl && sasl
    security_protocol = "SASL_SSL"
  elsif ssl && !sasl
    security_protocol = "SSL"
  elsif !ssl && sasl
    security_protocol = "SASL_PLAINTEXT"
  else
    security_protocol = "PLAINTEXT"
  end
  config[:"security.protocol"] = security_protocol

  config[:"compression.codec"] = @compression_codec if @compression_codec
  config[:"message.send.max.retries"] = @max_send_retries if @max_send_retries
  config[:"request.required.acks"] = @required_acks if @required_acks
  config[:"request.timeout.ms"] = @ack_timeout * 1000 if @ack_timeout
  config[:"queue.buffering.max.ms"] = @rdkafka_buffering_max_ms if @rdkafka_buffering_max_ms
  config[:"queue.buffering.max.messages"] = @rdkafka_buffering_max_messages if @rdkafka_buffering_max_messages
  config[:"message.max.bytes"] = @rdkafka_message_max_bytes if @rdkafka_message_max_bytes
  config[:"batch.num.messages"] = @rdkafka_message_max_num if @rdkafka_message_max_num

  @rdkafka_options.each { |k, v|
    config[k.to_sym] = v
  }

  config
end

#close_producer(producer) ⇒ Object 



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# File 'lib/fluent/plugin/out_rdkafka2.rb', line 248

def close_producer(producer)
  unless producer.close(10)
    log.warn("Queue is forcefully closed after 10 seconds wait")
  end
end

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_rdkafka2.rb', line 110

def configure(conf)
  super
  log.instance_eval {
    def add(level, &block)
      return unless block

      # Follow rdkakfa's log level. See also rdkafka-ruby's bindings.rb: https://github.com/appsignal/rdkafka-ruby/blob/e5c7261e3f2637554a5c12b924be297d7dca1328/lib/rdkafka/bindings.rb#L117
      case level
      when Logger::FATAL
        self.fatal(block.call)
      when Logger::ERROR
        self.error(block.call)
      when Logger::WARN
        self.warn(block.call)
      when Logger::INFO
        self.info(block.call)
      when Logger::DEBUG
        self.debug(block.call)
      else
        self.trace(block.call)
      end
    end
  }
  Rdkafka::Config.logger = log
  config = build_config
  @rdkafka = Rdkafka::Config.new(config)

  if @default_topic.nil?
    if @chunk_keys.include?(@topic_key) && !@chunk_key_tag
      log.warn "Use '#{@topic_key}' field of event record for topic but no fallback. Recommend to set default_topic or set 'tag' in buffer chunk keys like <buffer #{@topic_key},tag>"
    end
  else
    if @chunk_key_tag
      log.warn "default_topic is set. Fluentd's event tag is not used for topic"
    end
  end

  formatter_conf = conf.elements('format').first
  unless formatter_conf
    raise Fluent::ConfigError, "<format> section is required."
  end
  unless formatter_conf["@type"]
    raise Fluent::ConfigError, "format/@type is required."
  end
  @formatter_proc = setup_formatter(formatter_conf)
  @topic_key_sym = @topic_key.to_sym

  @headers_from_record_accessors = {}
  @headers_from_record.each do |key, value|
    @headers_from_record_accessors[key] = record_accessor_create(value)
  end
end

#enqueue_with_retry(producer, topic, record_buf, message_key, partition, headers) ⇒ Object 



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# File 'lib/fluent/plugin/out_rdkafka2.rb', line 338

def enqueue_with_retry(producer, topic, record_buf, message_key, partition, headers)
  attempt = 0
  loop do
    begin
      return producer.produce(topic: topic, payload: record_buf, key: message_key, partition: partition, headers: headers)
    rescue Exception => e
      if e.respond_to?(:code) && e.code == :queue_full
        if attempt <= @max_enqueue_retries
          log.warn "Failed to enqueue message; attempting retry #{attempt} of #{@max_enqueue_retries} after #{@enqueue_retry_backoff}s"
          sleep @enqueue_retry_backoff
          attempt += 1
        else
          raise "Failed to enqueue message although tried retry #{@max_enqueue_retries} times"
        end
      else
        raise e
      end
    end
  end
end

#get_producer ⇒ Object 



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# File 'lib/fluent/plugin/out_rdkafka2.rb', line 254

def get_producer
  if @share_producer
    @shared_producer
  else
    @producers_mutex.synchronize {
      producer = @producers[Thread.current.object_id]
      unless producer
        producer = @rdkafka.producer
        @producers[Thread.current.object_id] = producer
      end
      producer
    }
  end
end

#multi_workers_ready? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/out_rdkafka2.rb', line 220

def multi_workers_ready?
  true
end

#setup_formatter(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_rdkafka2.rb', line 269

def setup_formatter(conf)
  type = conf['@type']
  case type
  when 'ltsv'
    require 'ltsv'
    Proc.new { |tag, time, record| LTSV.dump(record) }
  else
    @formatter = formatter_create(usage: 'rdkafka-plugin', conf: conf)
    @formatter.method(:format)
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_rdkafka2.rb', line 224

def shutdown
  super
  shutdown_producers
end

#shutdown_producers ⇒ Object 



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# File 'lib/fluent/plugin/out_rdkafka2.rb', line 229

def shutdown_producers
  if @share_producer
    close_producer(@shared_producer)
    @shared_producer = nil
  else
    @producers_mutex.synchronize {
      shutdown_threads = @producers.map { |key, producer|
        th = Thread.new {
          close_producer(producer)
        }
        th.abort_on_exception = true
        th
      }
      shutdown_threads.each { |th| th.join }
      @producers = {}
    }
  end
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_rdkafka2.rb', line 209

def start
  if @share_producer
    @shared_producer = @rdkafka.producer
  else
    @producers = {}
    @producers_mutex = Mutex.new
  end

  super
end

#write(chunk) ⇒ Object 



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# File 'lib/fluent/plugin/out_rdkafka2.rb', line 281

def write(chunk)
  tag = chunk.metadata.tag
  topic = if @topic
            extract_placeholders(@topic, chunk)
          else
            (chunk.metadata.variables && chunk.metadata.variables[@topic_key_sym]) || @default_topic || tag
          end

  handlers = []
  record_buf = nil
  record_buf_bytes = nil

  headers = @headers.clone

  begin
    producer = get_producer
    chunk.msgpack_each { |time, record|
      begin
        record = inject_values_to_record(tag, time, record)
        record.delete(@topic_key) if @exclude_topic_key
        partition = (@exclude_partition ? record.delete(@partition_key) : record[@partition_key]) || @default_partition
        message_key = (@exclude_message_key ? record.delete(@message_key_key) : record[@message_key_key]) || @default_message_key

        @headers_from_record_accessors.each do |key, header_accessor|
          headers[key] = header_accessor.call(record)
        end

        record_buf = @formatter_proc.call(tag, time, record)
        record_buf_bytes = record_buf.bytesize
        if @max_send_limit_bytes && record_buf_bytes > @max_send_limit_bytes
          log.warn "record size exceeds max_send_limit_bytes. Skip event:", :time => time, :record => record
          next
        end
      rescue StandardError => e
        log.warn "unexpected error during format record. Skip broken event:", :error => e.to_s, :error_class => e.class.to_s, :time => time, :record => record
        next
      end

      handler = enqueue_with_retry(producer, topic, record_buf, message_key, partition, headers)
      if @rdkafka_delivery_handle_poll_timeout != 0
        handlers << handler
      end
    }
    handlers.each { |handler|
      handler.wait(max_wait_timeout: @rdkafka_delivery_handle_poll_timeout)
    }
  end
rescue Exception => e
  if @discard_kafka_delivery_failed
    log.warn "Delivery failed. Discard events:", :error => e.to_s, :error_class => e.class.to_s, :tag => tag
  else
    log.warn "Send exception occurred: #{e} at #{e.backtrace.first}"
    # Raise exception to retry sendind messages
    raise e
  end
end