Module: Datadog::Contrib::Rails::ActionController

Includes:
Patcher
Defined in:
lib/ddtrace/contrib/rails/action_controller.rb

Overview

Code used to create and handle ‘rails.action_controller’ spans.

Class Method Summary collapse

Methods included from Patcher

included

Methods included from Patcher::CommonMethods

#do_once, #without_warnings

Class Method Details

.exception_controller?(payload) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ddtrace/contrib/rails/action_controller.rb', line 69

def self.exception_controller?(payload)
  exception_controller_class = Datadog.configuration[:rails][:exception_controller]
  controller = payload.fetch(:controller)
  headers = payload.fetch(:headers)

  # If no exception controller class has been set,
  # guess whether this is an exception controller from the headers.
  if exception_controller_class.nil?
    !headers[:request_exception].nil?
  # If an exception controller class has been specified,
  # check if the controller is a kind of the exception controller class.
  elsif exception_controller_class.is_a?(Class) || exception_controller_class.is_a?(Module)
    controller <= exception_controller_class
  # Otherwise if the exception controller class is some other value (like false)
  # assume that this controller doesn't handle exceptions.
  else
    false
  end
end

.finish_processing(payload) ⇒ Object 



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# File 'lib/ddtrace/contrib/rails/action_controller.rb', line 32

def self.finish_processing(payload)
  # retrieve the tracing context and the latest active span
  tracing_context = payload.fetch(:tracing_context)
  span = tracing_context[:dd_request_span]
  return unless span && !span.finished?

  begin
    # Set the resource name, if it's still the default name
    if span.resource == span.name
      span.resource = "#{payload.fetch(:controller)}##{payload.fetch(:action)}"
    end

    # Set the parent resource if it's a `rack.request` span,
    # but not if its an exception contoller.
    if !span.parent.nil? && span.parent.name == 'rack.request' && !exception_controller?(payload)
      span.parent.resource = span.resource
    end

    span.set_tag('rails.route.action', payload.fetch(:action))
    span.set_tag('rails.route.controller', payload.fetch(:controller))

    exception = payload[:exception_object]
    if exception.nil?
      # [christian] in some cases :status is not defined,
      # rather than firing an error, simply acknowledge we don't know it.
      status = payload.fetch(:status, '?').to_s
      span.status = 1 if status.starts_with?('5')
    elsif Utils.exception_is_error?(exception)
      span.set_error(exception)
    end
  ensure
    span.finish()
  end
rescue StandardError => e
  Datadog::Tracer.log.error(e.message)
end

.instrument ⇒ Object 



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# File 'lib/ddtrace/contrib/rails/action_controller.rb', line 11

def self.instrument
  # patch Rails core components
  do_once(:instrument) do
    Datadog::RailsActionPatcher.patch_action_controller
  end
end

.start_processing(payload) ⇒ Object 



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# File 'lib/ddtrace/contrib/rails/action_controller.rb', line 18

def self.start_processing(payload)
  # trace the execution
  tracer = Datadog.configuration[:rails][:tracer]
  service = Datadog.configuration[:rails][:controller_service]
  type = Datadog::Ext::HTTP::TYPE
  span = tracer.trace('rails.action_controller', service: service, span_type: type)

  # attach the current span to the tracing context
  tracing_context = payload.fetch(:tracing_context)
  tracing_context[:dd_request_span] = span
rescue StandardError => e
  Datadog::Tracer.log.error(e.message)
end