Class: Fluent::KafkaInput

Inherits:
Input
  • Object
show all
Defined in:
lib/fluent/plugin/in_kafka.rb

Defined Under Namespace

Classes: OffsetManager, TopicEntry, TopicWatcher

Instance Method Summary collapse

Constructor Details

#initialize ⇒ KafkaInput

Returns a new instance of KafkaInput.



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# File 'lib/fluent/plugin/in_kafka.rb', line 46

def initialize
  super
  require 'poseidon'
  require 'zookeeper'
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/in_kafka.rb', line 52

def configure(conf)
  super

  @topic_list = []
  if @topics
    @topic_list = @topics.split(',').map { |topic|
      TopicEntry.new(topic.strip, @partition, @offset)
    }
  else
    conf.elements.select { |element| element.name == 'topic' }.each do |element|
      unless element.has_key?('topic')
        raise ConfigError, "kafka: 'topic' is a require parameter in 'topic element'."
      end
      partition = element.has_key?('partition') ? element['partition'].to_i : 0
      offset = element.has_key?('offset') ? element['offset'].to_i : -1
      @topic_list.push(TopicEntry.new(element['topic'], partition, offset))
    end
  end

  if @topic_list.empty?
    raise ConfigError, "kafka: 'topics' or 'topic element' is a require parameter"
  end

  case @format
  when 'json'
    require 'yajl'
  when 'ltsv'
    require 'ltsv'
  when 'msgpack'
    require 'msgpack'
  end
end

#run ⇒ Object 



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

def run
  @loop.run
rescue
  $log.error "unexpected error", :error=>$!.to_s
  $log.error_backtrace
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/in_kafka.rb', line 118

def shutdown
  @loop.stop
  @zookeeper.close! if @zookeeper
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/in_kafka.rb', line 85

def start
  @loop = Coolio::Loop.new
  opt = {}
  opt[:max_bytes] = @max_bytes if @max_bytes
  opt[:max_wait_ms] = @max_wait_ms if @max_wait_ms
  opt[:min_bytes] = @min_bytes if @min_bytes
  opt[:socket_timeout_ms] = @socket_timeout_ms if @socket_timeout_ms

  @zookeeper = Zookeeper.new(@offset_zookeeper) if @offset_zookeeper

  @topic_watchers = @topic_list.map {|topic_entry|
    offset_manager = OffsetManager.new(topic_entry, @zookeeper, @offset_zk_root_node) if @offset_zookeeper
    TopicWatcher.new(
      topic_entry,
      @host,
      @port,
      @client_id,
      interval,
      @format,
      @message_key,
      @add_offset_in_record,
      @add_prefix,
      @add_suffix,
      offset_manager,
      router,
      opt)
  }
  @topic_watchers.each {|tw|
    tw.attach(@loop)
  }
  @thread = Thread.new(&method(:run))
end