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Class: Rails::Rack::Logger

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::ActiveSupport::LogSubscriber, ::ActiveSupport::Subscriber
Instance Chain:
self, ::ActiveSupport::LogSubscriber, ::ActiveSupport::ColorizeLogging, ::ActiveSupport::Subscriber
Inherits: ActiveSupport::LogSubscriber
Defined in: railties/lib/rails/rack/logger.rb

Overview

Sets log tags, logs the request, calls the app, and flushes the logs.

Log tags (taggers) can be an ::Array containing: methods that the request object responds to, objects that respond to to_s or Proc objects that accept an instance of the request object.

Constant Summary

::ActiveSupport::ColorizeLogging - Included

BLACK, BLUE, CYAN, GREEN, MAGENTA, MODES, RED, WHITE, YELLOW

::ActiveSupport::LogSubscriber - Inherited

LEVEL_CHECKS

Class Attribute Summary

::ActiveSupport::LogSubscriber - Inherited

.log_levels, .log_levels?, .logger, .logger=

::ActiveSupport::Subscriber - Inherited

.namespace, .notifier, .subscriber

Class Method Summary

::ActiveSupport::LogSubscriber - Inherited

.attach_to,
.flush_all!

Flush all log_subscribers’ logger.
.log_subscribers, .new, .fetch_public_methods, .set_event_levels, .subscribe_log_level

::ActiveSupport::Subscriber - Inherited

.attach_to

Attach the subscriber to a namespace.
.detach_from

Detach the subscriber from a namespace.
.method_added

Adds event subscribers for all new methods added to the class.
.new, .subscribers, .add_event_subscriber, .fetch_public_methods, .find_attached_subscriber, .invalid_event?, .pattern_subscribed?, .prepare_pattern, .remove_event_subscriber

Instance Attribute Summary

::ActiveSupport::LogSubscriber - Inherited

#event_levels=

::ActiveSupport::Subscriber - Inherited

#patterns

Instance Method Summary

::ActiveSupport::LogSubscriber - Inherited

#call, #logger, #silenced?, #log_exception

::ActiveSupport::ColorizeLogging - Included

#color

Set color by using a symbol or one of the defined constants.
#colorize_logging, #debug, #error, #fatal, #info, #mode_from, #unknown, #warn

::ActiveSupport::Subscriber - Inherited

#call

Constructor Details

.new(app, taggers = nil) ⇒ Logger

[ GitHub ] 

  


# File 'railties/lib/rails/rack/logger.rb', line 15



def initialize(app, taggers = nil)
  @app          = app
  @taggers      = taggers || []
end


  







Instance Method Details



  

    #call(env)  
  

  [ GitHub ]


  

  


# File 'railties/lib/rails/rack/logger.rb', line 20



def call(env)
  request = ActionDispatch::Request.new(env)

  env["rails.rack_logger_tag_count"] = if logger.respond_to?(:push_tags)
    logger.push_tags(*compute_tags(request)).size
  else
    0
  end

  call_app(request, env)
end


  








  

    #call_app(request, env)   (private)
  

  [ GitHub ]


  

  


# File 'railties/lib/rails/rack/logger.rb', line 33



def call_app(request, env) # :doc:
  logger_tag_pop_count = env["rails.rack_logger_tag_count"]

  instrumenter = ActiveSupport::Notifications.instrumenter
  handle = instrumenter.build_handle("request.action_dispatch", { request: request })
  handle.start

  logger.info { started_request_message(request) }
  status, headers, body = response = @app.call(env)
  body = ::Rack::BodyProxy.new(body) { finish_request_instrumentation(handle, logger_tag_pop_count) }

  if response.frozen?
    [status, headers, body]
  else
    response[2] = body
    response
  end
rescue Exception
  finish_request_instrumentation(handle, logger_tag_pop_count)
  raise
end


  








  

    #compute_tags(request)   (private)
  

  [ GitHub ]


  

  


# File 'railties/lib/rails/rack/logger.rb', line 64



def compute_tags(request) # :doc:
  @taggers.collect do |tag|
    case tag
    when Proc
      tag.call(request)
    when Symbol
      request.send(tag)
    else
      tag
    end
  end
end


  








  

    #finish_request_instrumentation(handle, logger_tag_pop_count)   (private)
  

  [ GitHub ]


  

  


# File 'railties/lib/rails/rack/logger.rb', line 81



def finish_request_instrumentation(handle, logger_tag_pop_count)
  handle.finish
  logger.pop_tags(logger_tag_pop_count) if logger.respond_to?(:pop_tags) && logger_tag_pop_count > 0
  ActiveSupport::LogSubscriber.flush_all!
end


  








  

    #logger   (private)
  

  [ GitHub ]


  

  


# File 'railties/lib/rails/rack/logger.rb', line 77



def logger
  Rails.logger
end


  








  

    #started_request_message(request)   (private)
  



  

    

Started GET “/session/new” for 127.0.0.1 at 2012-09-26 14:51:42 -0700


  



  [ GitHub ]


  

  


# File 'railties/lib/rails/rack/logger.rb', line 56



def started_request_message(request) # :doc:
  sprintf('Started %s "%s" for %s at %s',
    request.raw_request_method,
    request.filtered_path,
    request.remote_ip,
    Time.now)
end