Class: Fluent::KafkaInput::TopicWatcher

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

Instance Method Summary collapse

Constructor Details

#initialize(topic_entry, kafka, interval, parser, add_prefix, add_suffix, offset_manager, router, kafka_message_key, options = {}) ⇒ TopicWatcher

Returns a new instance of TopicWatcher.



231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
# File 'lib/fluent/plugin/in_kafka.rb', line 231

def initialize(topic_entry, kafka, interval, parser, add_prefix, add_suffix, offset_manager, router, kafka_message_key, options={})
  @topic_entry = topic_entry
  @kafka = kafka
  @callback = method(:consume)
  @parser = parser
  @add_prefix = add_prefix
  @add_suffix = add_suffix
  @options = options
  @offset_manager = offset_manager
  @router = router
  @kafka_message_key = kafka_message_key

  @next_offset = @topic_entry.offset
  if @topic_entry.offset == -1 && offset_manager
    @next_offset = offset_manager.next_offset
  end
  @fetch_args = {
    topic: @topic_entry.topic,
    partition: @topic_entry.partition,
  }.merge(@options)

  super(interval, true)
end

Instance Method Details

#consumeObject



263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
# File 'lib/fluent/plugin/in_kafka.rb', line 263

def consume
  offset = @next_offset
  @fetch_args[:offset] = offset
  messages = @kafka.fetch_messages(@fetch_args)

  return if messages.size.zero?

  es = Fluent::MultiEventStream.new
  tag = @topic_entry.topic
  tag = @add_prefix + "." + tag if @add_prefix
  tag = tag + "." + @add_suffix if @add_suffix

  messages.each { |msg|
    begin
      record = @parser.call(msg, @topic_entry)
      if @use_record_time
        if @time_format
          record_time = @time_parser.parse(record['time'])
        else
          record_time = record['time']
        end
      else
        record_time = Fluent::Engine.now
      end
      if @kafka_message_key
        record[@kafka_message_key] = msg.key
      end
      es.add(record_time, record)
    rescue => e
      $log.warn "parser error in #{@topic_entry.topic}/#{@topic_entry.partition}", :error => e.to_s, :value => msg.value, :offset => msg.offset
      $log.debug_backtrace
    end
  }
  offset = messages.last.offset + 1

  unless es.empty?
    @router.emit_stream(tag, es)

    if @offset_manager
      @offset_manager.save_offset(offset)
    end
    @next_offset = offset
  end
end

#on_timerObject



255
256
257
258
259
260
261
# File 'lib/fluent/plugin/in_kafka.rb', line 255

def on_timer
  @callback.call
rescue => e
  # TODO log?
  $log.error e.to_s
  $log.error_backtrace
end