Class: Fluent::KafkaOutput

Inherits:
Output
  • Object
show all
Defined in:
lib/fluent/plugin/out_kafka.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ KafkaOutput

Returns a new instance of KafkaOutput.



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# File 'lib/fluent/plugin/out_kafka.rb', line 4

def initialize
  super
  require 'poseidon'
end

Instance Attribute Details

#field_separator ⇒ Object

Returns the value of attribute field_separator.



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# File 'lib/fluent/plugin/out_kafka.rb', line 39

def field_separator
  @field_separator
end

#output_data_type ⇒ Object

Returns the value of attribute output_data_type.



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# File 'lib/fluent/plugin/out_kafka.rb', line 38

def output_data_type
  @output_data_type
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka.rb', line 70

def configure(conf)
  super
  if @zookeeper
    require 'zookeeper'
    require 'yajl'
  else
    @seed_brokers = @brokers.match(",").nil? ? [@brokers] : @brokers.split(",")
    log.info "brokers has been set directly: #{@seed_brokers}"
  end
  if @compression_codec == 'snappy'
    require 'snappy'
  end
  case @output_data_type
  when 'json'
    require 'yajl'
  when 'ltsv'
    require 'ltsv'
  when 'msgpack'
    require 'msgpack'
  end

  @f_separator = case @field_separator
                 when /SPACE/i then ' '
                 when /COMMA/i then ','
                 when /SOH/i then "\x01"
                 else "\t"
                 end

  @custom_attributes = if @output_data_type == 'json'
                         nil
                       elsif @output_data_type == 'ltsv'
                         nil
                       elsif @output_data_type == 'msgpack'
                         nil
                       elsif @output_data_type =~ /^attr:(.*)$/
                         $1.split(',').map(&:strip).reject(&:empty?)
                       else
                         @formatter = Fluent::Plugin.new_formatter(@output_data_type)
                         @formatter.configure(conf)
                         nil
                       end

end

#emit(tag, es, chain) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka.rb', line 144

def emit(tag, es, chain)
  begin
    chain.next
    es.each do |time,record|
      record['time'] = time if @output_include_time
      record['tag'] = tag if @output_include_tag
      topic = record['topic'] || self.default_topic || tag
      partition_key = record['partition_key'] || @default_partition_key
      value = @formatter.nil? ? parse_record(record) : @formatter.format(tag, time, record)
      log.trace("message send to #{topic} with key: #{partition_key} and value: #{value}.")
      message = Poseidon::MessageToSend.new(topic, value, partition_key)
      @producer.send_messages([message])
    end
  rescue Exception => e
    log.warn("Send exception occurred: #{e}")
    @producer.close if @producer
    refresh_producer()
    raise e
  end
end

#parse_record(record) ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka.rb', line 123

def parse_record(record)
  if @custom_attributes.nil?
    case @output_data_type
    when 'json'
      Yajl::Encoder.encode(record)
    when 'ltsv'
      LTSV.dump(record)
    when 'msgpack'
      record.to_msgpack
    else
      record.to_s
    end
  else
    @custom_attributes.unshift('time') if @output_include_time
    @custom_attributes.unshift('tag') if @output_include_tag
    @custom_attributes.map { |attr|
      record[attr].nil? ? '' : record[attr].to_s
    }.join(@f_separator)
  end
end

#refresh_producer ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka.rb', line 47

def refresh_producer()
  if @zookeeper
    @seed_brokers = []
    z = Zookeeper.new(@zookeeper)
    z.get_children(:path => @zookeeper_path)[:children].each do |id|
      broker = Yajl.load(z.get(:path => @zookeeper_path + "/#{id}")[:data])
      @seed_brokers.push("#{broker['host']}:#{broker['port']}")
    end
    z.close
    log.info "brokers has been refreshed via Zookeeper: #{@seed_brokers}"
  end
  begin
    if @seed_brokers.length > 0
      @producer = Poseidon::Producer.new(@seed_brokers, @client_id, :max_send_retries => @max_send_retries, :required_acks => @required_acks, :ack_timeout_ms => @ack_timeout_ms, :compression_codec => @compression_codec.to_sym)
      log.info "initialized producer #{@client_id}"
    else
      log.warn "No brokers found on Zookeeper"
    end
  rescue Exception => e
    log.error e
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka.rb', line 119

def shutdown
  super
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/out_kafka.rb', line 114

def start
  super
  refresh_producer()
end