Module: NewRelic::Agent::AgentHelpers::SpecialStartup

Included in:
NewRelic::Agent::Agent
Defined in:
lib/new_relic/agent/agent_helpers/special_startup.rb

Instance Method Summary collapse

Instance Method Details

#defer_for_delayed_job? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/new_relic/agent/agent_helpers/special_startup.rb', line 35

def defer_for_delayed_job?
  NewRelic::Agent.config[:dispatcher] == :delayed_job &&
    !NewRelic::DelayedJobInjection.worker_name
end

#defer_for_resque? ⇒ Boolean

Return true if we’re using resque and it hasn’t had a chance to (potentially) daemonize itself. This avoids hanging when there’s a Thread started before Resque calls Process.daemon (Jira RUBY-857)

Returns:

  • (Boolean) 


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# File 'lib/new_relic/agent/agent_helpers/special_startup.rb', line 25

def defer_for_resque?
  NewRelic::Agent.config[:dispatcher] == :resque &&
    NewRelic::Agent::Instrumentation::Resque::Helper.resque_fork_per_job? &&
    !PipeChannelManager.listener.started?
end

#in_resque_child_process? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/new_relic/agent/agent_helpers/special_startup.rb', line 31

def in_resque_child_process?
  defined?(@service) && @service.is_a?(PipeService)
end

#install_exit_handler ⇒ Object 



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# File 'lib/new_relic/agent/agent_helpers/special_startup.rb', line 65

def install_exit_handler
  return unless should_install_exit_handler?

  NewRelic::Agent.logger.debug('Installing at_exit handler')
  at_exit { shutdown }
end

#should_install_exit_handler? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/new_relic/agent/agent_helpers/special_startup.rb', line 59

def should_install_exit_handler?
  return false unless Agent.config[:send_data_on_exit]

  !sinatra_classic_app? || Agent.config[:force_install_exit_handler]
end

#sinatra_classic_app? ⇒ Boolean

This matters when the following three criteria are met:

  1. A Sinatra ‘classic’ application is being run

  2. The app is being run by executing the main file directly, rather than via a config.ru file.

  3. newrelic_rpm is required after sinatra

In this case, the entire application runs from an at_exit handler in Sinatra, and if we were to install ours, it would be executed before the one in Sinatra, meaning that we’d shutdown the agent too early and never collect any data.

Returns:

  • (Boolean) 


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# File 'lib/new_relic/agent/agent_helpers/special_startup.rb', line 51

def sinatra_classic_app?
  (
    defined?(Sinatra::Application) &&
    Sinatra::Application.respond_to?(:run) &&
    Sinatra::Application.run?
  )
end

#using_forking_dispatcher? ⇒ Boolean

If we’re using a dispatcher that forks before serving requests, we need to wait until the children are forked before connecting, otherwise the parent process sends useless data

Returns:

  • (Boolean) 


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# File 'lib/new_relic/agent/agent_helpers/special_startup.rb', line 12

def using_forking_dispatcher?
  if [:puma, :passenger, :unicorn, :falcon].include?(Agent.config[:dispatcher])
    ::NewRelic::Agent.logger.info('Deferring startup of agent reporting thread because ' \
      "#{Agent.config[:dispatcher]} may fork.")
    true
  else
    false
  end
end