require 'benchmark' module ActionController #:nodoc: # The benchmarking module times the performance of actions and reports to the logger. If the Active Record # package has been included, a separate timing section for database calls will be added as well. module Benchmarking #:nodoc: def self.included(base) base.extend(ClassMethods) base.class_eval do alias_method_chain :perform_action, :benchmark alias_method_chain :render, :benchmark end end module ClassMethods # Log and benchmark the workings of a single block and silence whatever logging that may have happened inside it # (unless use_silence is set to false). # # The benchmark is only recorded if the current level of the logger matches the log_level, which makes it # easy to include benchmarking statements in production software that will remain inexpensive because the benchmark # will only be conducted if the log level is low enough. def benchmark(title, log_level = Logger::DEBUG, use_silence = true) if logger && logger.level == log_level result = nil ms = Benchmark.ms { result = use_silence ? silence { yield } : yield } logger.add(log_level, "#{title} (#{('%.1f' % ms)}ms)") result else yield end end # Silences the logger for the duration of the block. def silence old_logger_level, logger.level = logger.level, Logger::ERROR if logger yield ensure logger.level = old_logger_level if logger end end protected def render_with_benchmark(options = nil, extra_options = {}, &block) if logger if Object.const_defined?("ActiveRecord") && ActiveRecord::Base.connected? db_runtime = ActiveRecord::Base.connection.reset_runtime end render_output = nil @view_runtime = Benchmark.ms { render_output = render_without_benchmark(options, extra_options, &block) } if Object.const_defined?("ActiveRecord") && ActiveRecord::Base.connected? @db_rt_before_render = db_runtime @db_rt_after_render = ActiveRecord::Base.connection.reset_runtime @view_runtime -= @db_rt_after_render end render_output else render_without_benchmark(options, extra_options, &block) end end private def perform_action_with_benchmark if logger && logger.info? ms = [Benchmark.ms { perform_action_without_benchmark }, 0.01].max logging_view = defined?(@view_runtime) logging_active_record = Object.const_defined?("ActiveRecord") && ActiveRecord::Base.connected? log_message = 'Completed in %.0fms' % ms if logging_view || logging_active_record log_message << " (" log_message << view_runtime if logging_view if logging_active_record log_message << ", " if logging_view log_message << active_record_runtime + ")" else ")" end end log_message << " | #{response.status}" log_message << " [#{complete_request_uri rescue "unknown"}]" logger.info(log_message) response.headers["X-Runtime"] = "%.0f" % ms else perform_action_without_benchmark end end def view_runtime "View: %.0f" % @view_runtime end def active_record_runtime db_runtime = ActiveRecord::Base.connection.reset_runtime db_runtime += @db_rt_before_render if @db_rt_before_render db_runtime += @db_rt_after_render if @db_rt_after_render "DB: %.0f" % db_runtime end end end