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 <tt>use_silence</tt> is set to false).
#
# The benchmark is only recorded if the current level of the logger matches the <tt>log_level</tt>, 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
seconds = Benchmark.realtime { result = use_silence ? silence { yield } : yield }
logger.add(log_level, "#{title} (#{'%.5f' % seconds})")
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
def render_with_benchmark(options = nil, deprecated_status = nil, &block)
unless logger
render_without_benchmark(options, deprecated_status, &block)
else
db_runtime = ActiveRecord::Base.connection.reset_runtime if Object.const_defined?("ActiveRecord") && ActiveRecord::Base.connected?
render_output = nil
@rendering_runtime = Benchmark::measure{ render_output = render_without_benchmark(options, deprecated_status, &block) }.real
if Object.const_defined?("ActiveRecord") && ActiveRecord::Base.connected?
@db_rt_before_render = db_runtime
@db_rt_after_render = ActiveRecord::Base.connection.reset_runtime
@rendering_runtime -= @db_rt_after_render
end
render_output
end
end
def perform_action_with_benchmark
unless logger
perform_action_without_benchmark
else
runtime = [ Benchmark::measure{ perform_action_without_benchmark }.real, 0.0001 ].max
log_message = "Completed in #{sprintf("%.5f", runtime)} (#{(1 / runtime).floor} reqs/sec)"
log_message << rendering_runtime(runtime) if defined?(@rendering_runtime)
log_message << active_record_runtime(runtime) if Object.const_defined?("ActiveRecord") && ActiveRecord::Base.connected?
log_message << " | #{headers["Status"]}"
log_message << " [#{complete_request_uri rescue "unknown"}]"
logger.info(log_message)
response.headers["X-Runtime"] = sprintf("%.5f", runtime)
end
end
private
def rendering_runtime(runtime)
" | Rendering: #{sprintf("%.5f", @rendering_runtime)} (#{sprintf("%d", (@rendering_runtime * 100) / runtime)}%)"
end
def active_record_runtime(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_percentage = (db_runtime * 100) / runtime
" | DB: #{sprintf("%.5f", db_runtime)} (#{sprintf("%d", db_percentage)}%)"
end
end
end
