Class: Fluent::KafkaInput

Inherits:
Input
  • Object
show all
Includes:
Fluent::KafkaPluginUtil::SSLSettings, Fluent::KafkaPluginUtil::SaslSettings
Defined in:
lib/fluent/plugin/in_kafka.rb

Defined Under Namespace

Classes: OffsetManager, TopicEntry, TopicWatcher

Instance Method Summary collapse

Methods included from Fluent::KafkaPluginUtil::SaslSettings

included

Methods included from Fluent::KafkaPluginUtil::SSLSettings

included, #read_ssl_file

Constructor Details

#initialize ⇒ KafkaInput

Returns a new instance of KafkaInput.



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# File 'lib/fluent/plugin/in_kafka.rb', line 55

def initialize
  super
  require 'kafka'

  @time_parser = nil
end

Instance Method Details

#add_offset_in_hash(hash, te, offset) ⇒ Object 



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# File 'lib/fluent/plugin/in_kafka.rb', line 145

def add_offset_in_hash(hash, te, offset)
  hash['kafka_topic'.freeze] = te.topic
  hash['kafka_partition'.freeze] = te.partition
  hash['kafka_offset'.freeze] = offset
end

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/in_kafka.rb', line 62

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 Fluent::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 Fluent::ConfigError, "kafka: 'topics' or 'topic element' is a require parameter"
  end

  # For backward compatibility
  @brokers = case
             when @host && @port
               ["#{@host}:#{@port}"]
             when @host
               ["#{@host}:9092"]
             when @port
               ["localhost:#{@port}"]
             else
               @brokers
             end

  if conf['max_wait_ms']
    log.warn "'max_wait_ms' parameter is deprecated. Use second unit 'max_wait_time' instead"
    @max_wait_time = conf['max_wait_ms'].to_i / 1000
  end

  @max_wait_time = @interval if @max_wait_time.nil?

  require 'zookeeper' if @offset_zookeeper

  @parser_proc = setup_parser

  if @use_record_time and @time_format
    @time_parser = Fluent::TextParser::TimeParser.new(@time_format)
  end
end

#run ⇒ Object 



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# File 'lib/fluent/plugin/in_kafka.rb', line 194

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

#setup_parser ⇒ Object 



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# File 'lib/fluent/plugin/in_kafka.rb', line 113

def setup_parser
  case @format
  when 'json'
    require 'yajl'
    Proc.new { |msg, te|
      r = Yajl::Parser.parse(msg.value)
      add_offset_in_hash(r, te, msg.offset) if @add_offset_in_record
      r
    }
  when 'ltsv'
    require 'ltsv'
    Proc.new { |msg, te|
      r = LTSV.parse(msg.value).first
      add_offset_in_hash(r, te, msg.offset) if @add_offset_in_record
      r
    }
  when 'msgpack'
    require 'msgpack'
    Proc.new { |msg, te|
      r = MessagePack.unpack(msg.value)
      add_offset_in_hash(r, te, msg.offset) if @add_offset_in_record
      r
    }
  when 'text'
    Proc.new { |msg, te|
      r = {@message_key => msg.value}
      add_offset_in_hash(r, te, msg.offset) if @add_offset_in_record
      r
    }
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/in_kafka.rb', line 186

def shutdown
  @loop.stop
  @zookeeper.close! if @zookeeper
  @thread.join
  @kafka.close
  super
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/in_kafka.rb', line 151

def start
  super

  @loop = Coolio::Loop.new
  opt = {}
  opt[:max_bytes] = @max_bytes if @max_bytes
  opt[:max_wait_time] = @max_wait_time if @max_wait_time
  opt[:min_bytes] = @min_bytes if @min_bytes

  @kafka = Kafka.new(seed_brokers: @brokers, client_id: @client_id,
                     ssl_ca_cert: read_ssl_file(@ssl_ca_cert),
                     ssl_client_cert: read_ssl_file(@ssl_client_cert),
                     ssl_client_cert_key: read_ssl_file(@ssl_client_cert_key),
                     sasl_gssapi_principal: @principal, sasl_gssapi_keytab: @keytab)
  @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,
      @kafka,
      interval,
      @parser_proc,
      @add_prefix,
      @add_suffix,
      offset_manager,
      router,
      opt)
  }
  @topic_watchers.each {|tw|
    tw.attach(@loop)
  }
  @thread = Thread.new(&method(:run))
end