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require "benchmark"
require "abstract_controller/logger"
module ActionController
# Adds instrumentation to several ends in ActionController::Base. It also provides
# some hooks related with process_action, this allows an ORM like Active Record
# and/or DataMapper to plug in ActionController and show related information.
#
# Check ActiveRecord::Railties::ControllerRuntime for an example.
module Instrumentation
extend ActiveSupport::Concern
include AbstractController::Logger
attr_internal :view_runtime
def process_action(*args)
raw_payload = {
controller: self.class.name,
action: action_name,
params: request.filtered_parameters,
headers: request.headers,
format: request.format.ref,
method: request.request_method,
path: request.fullpath
}
ActiveSupport::Notifications.instrument("start_processing.action_controller", raw_payload.dup)
ActiveSupport::Notifications.instrument("process_action.action_controller", raw_payload) do |payload|
begin
result = super
payload[:status] = response.status
result
ensure
append_info_to_payload(payload)
end
end
end
def render(*args)
render_output = nil
self.view_runtime = cleanup_view_runtime do
Benchmark.ms { render_output = super }
end
render_output
end
def send_file(path, options = {})
ActiveSupport::Notifications.instrument("send_file.action_controller",
options.merge(path: path)) do
super
end
end
def send_data(data, options = {})
ActiveSupport::Notifications.instrument("send_data.action_controller", options) do
super
end
end
def redirect_to(*args)
ActiveSupport::Notifications.instrument("redirect_to.action_controller") do |payload|
result = super
payload[:status] = response.status
payload[:location] = response.filtered_location
result
end
end
private
# A hook invoked every time a before callback is halted.
def halted_callback_hook(filter)
ActiveSupport::Notifications.instrument("halted_callback.action_controller", filter: filter)
end
# A hook which allows you to clean up any time, wrongly taken into account in
# views, like database querying time.
#
# def cleanup_view_runtime
# super - time_taken_in_something_expensive
# end
#
# :api: plugin
def cleanup_view_runtime #:nodoc:
yield
end
# Every time after an action is processed, this method is invoked
# with the payload, so you can add more information.
# :api: plugin
def append_info_to_payload(payload) #:nodoc:
payload[:view_runtime] = view_runtime
end
module ClassMethods
# A hook which allows other frameworks to log what happened during
# controller process action. This method should return an array
# with the messages to be added.
# :api: plugin
def log_process_action(payload) #:nodoc:
messages, view_runtime = [], payload[:view_runtime]
messages << ("Views: %.1fms" % view_runtime.to_f) if view_runtime
messages
end
end
end
end