Class: Karafka::Instrumentation::Vendors::Datadog::LoggerListener

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
Core::Configurable
Defined in:
lib/karafka/instrumentation/vendors/datadog/logger_listener.rb

Overview

A karafka’s logger listener for Datadog It depends on the ‘ddtrace’ gem

Instance Method Summary collapse

Constructor Details

#initialize(&block) ⇒ LoggerListener

Returns a new instance of LoggerListener.

Parameters:

  • block (Proc) —

    configuration block



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# File 'lib/karafka/instrumentation/vendors/datadog/logger_listener.rb', line 35

def initialize(&block)
  configure
  setup(&block) if block
end

Instance Method Details

#on_error_occurred(event) ⇒ Object

There are many types of errors that can occur in many places, but we provide a single handler for all of them to simplify error instrumentation.

Parameters:

  • event (Karafka::Core::Monitoring::Event) —

    event details including payload



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# File 'lib/karafka/instrumentation/vendors/datadog/logger_listener.rb', line 86

def on_error_occurred(event)
  push_tags

  error = event[:error]
  client.active_span&.set_error(error)

  case event[:type]
  when 'consumer.consume.error'
    error "Consumer consuming error: #{error}"
  when 'consumer.revoked.error'
    error "Consumer on revoked failed due to an error: #{error}"
  when 'consumer.before_enqueue.error'
    error "Consumer before enqueue failed due to an error: #{error}"
  when 'consumer.before_consume.error'
    error "Consumer before consume failed due to an error: #{error}"
  when 'consumer.after_consume.error'
    error "Consumer after consume failed due to an error: #{error}"
  when 'consumer.shutdown.error'
    error "Consumer on shutdown failed due to an error: #{error}"
  when 'worker.process.error'
    fatal "Worker processing failed due to an error: #{error}"
  when 'connection.listener.fetch_loop.error'
    error "Listener fetch loop error: #{error}"
  when 'runner.call.error'
    fatal "Runner crashed due to an error: #{error}"
  when 'app.stopping.error'
    error 'Forceful Karafka server stop'
  when 'librdkafka.error'
    error "librdkafka internal error occurred: #{error}"
    # Those will only occur when retries in the client fail and when they did not stop
    # after back-offs
  when 'connection.client.poll.error'
    error "Data polling error occurred: #{error}"
  else
    pop_tags
    # This should never happen. Please contact the maintainers
    raise Errors::UnsupportedCaseError, event
  end

  pop_tags
end

#on_worker_process(event) ⇒ Object

Prints info about the fact that a given job has started

Parameters:

  • event (Karafka::Core::Monitoring::Event) —

    event details including payload



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# File 'lib/karafka/instrumentation/vendors/datadog/logger_listener.rb', line 49

def on_worker_process(event)
  current_span = client.trace('karafka.consumer', service: service_name)
  push_tags

  job = event[:job]
  job_type = job.class.to_s.split('::').last
  consumer = job.executor.topic.consumer
  topic = job.executor.topic.name

  current_span.resource = "#{consumer}#consume"
  info "[#{job.id}] #{job_type} job for #{consumer} on #{topic} started"

  pop_tags
end

#on_worker_processed(event) ⇒ Object

Prints info about the fact that a given job has finished

Parameters:

  • event (Karafka::Core::Monitoring::Event) —

    event details including payload



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# File 'lib/karafka/instrumentation/vendors/datadog/logger_listener.rb', line 67

def on_worker_processed(event)
  push_tags

  job = event[:job]
  time = event[:time]
  job_type = job.class.to_s.split('::').last
  consumer = job.executor.topic.consumer
  topic = job.executor.topic.name

  info "[#{job.id}] #{job_type} job for #{consumer} on #{topic} finished in #{time}ms"

  client.active_span&.finish

  pop_tags
end

#pop_tags ⇒ Object

Pops datadog’s tags from the logger This is required when tracing log lines asynchronously to avoid the logs of the different processes to be correlated



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# File 'lib/karafka/instrumentation/vendors/datadog/logger_listener.rb', line 146

def pop_tags
  return unless Karafka.logger.respond_to?(:pop_tags)

  Karafka.logger.pop_tags
end

#push_tags ⇒ Object

Pushes datadog’s tags to the logger This is required when tracing log lines asynchronously to correlate logs of the same process together



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# File 'lib/karafka/instrumentation/vendors/datadog/logger_listener.rb', line 137

def push_tags
  return unless Karafka.logger.respond_to?(:push_tags)

  Karafka.logger.push_tags(client.log_correlation)
end

#setup(&block) ⇒ Object

Note:

We define this alias to be consistent with ‘WaterDrop#setup`

Parameters:

  • block (Proc) —

    configuration block



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# File 'lib/karafka/instrumentation/vendors/datadog/logger_listener.rb', line 42

def setup(&block)
  configure(&block)
end