Created
February 18, 2011 09:13
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Experimental Mongo Instrumentation for Rails 3
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module Mongo | |
module Instrumentation | |
def self.instrument(clazz, *methods) | |
clazz.module_eval do | |
methods.each do |m| | |
class_eval %{def #{m}_with_instrumentation(*args, &block) | |
ActiveSupport::Notifications.instrumenter.instrument "mongo.mongo", :name => "#{m}" do | |
#{m}_without_instrumentation(*args, &block) | |
end | |
end | |
} | |
alias_method_chain m, :instrumentation | |
end | |
end | |
end | |
class Railtie < Rails::Railtie | |
initializer "mongo.instrumentation" do |app| | |
Mongo::Instrumentation.instrument Mongo::Connection, :send_message, :send_message_with_safe_check, :receive_message | |
#Mongo::Instrumentation.instrument Mongo::Collection, :find, :save, :insert, :update | |
#Mongo::Instrumentation.instrument Mongo::DB, :command | |
ActiveSupport.on_load(:action_controller) do | |
include Mongo::Instrumentation::ControllerRuntime | |
end | |
Mongo::Instrumentation::LogSubscriber.attach_to :mongo | |
end | |
end | |
module ControllerRuntime | |
extend ActiveSupport::Concern | |
protected | |
attr_internal :mongo_runtime | |
def cleanup_view_runtime | |
mongo_rt_before_render = Mongo::Instrumentation::LogSubscriber.reset_runtime | |
runtime = super | |
mongo_rt_after_render = Mongo::Instrumentation::LogSubscriber.reset_runtime | |
self.mongo_runtime = mongo_rt_before_render + mongo_rt_after_render | |
runtime - mongo_rt_after_render | |
end | |
def append_info_to_payload(payload) | |
super | |
payload[:mongo_runtime] = mongo_runtime | |
end | |
module ClassMethods | |
def log_process_action(payload) | |
messages, mongo_runtime = super, payload[:mongo_runtime] | |
messages << ("Mongo: %.1fms" % mongo_runtime.to_f) if mongo_runtime | |
messages | |
end | |
end | |
end | |
class LogSubscriber < ActiveSupport::LogSubscriber | |
def self.runtime=(value) | |
Thread.current["mongo_mongo_runtime"] = value | |
end | |
def self.runtime | |
Thread.current["mongo_mongo_runtime"] ||= 0 | |
end | |
def self.reset_runtime | |
rt, self.runtime = runtime, 0 | |
rt | |
end | |
def mongo(event) | |
self.class.runtime += event.duration | |
end | |
end | |
end | |
end |
This code is now a gem, 'mongo-rails-instrumentation', and available on github here: https://github.com/tomafro/mongo-rails-instrumentation.
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This is great. I was just about to suggest not instrumenting :find :save :insert :update, but you beat me to it. Thanks! I hope you comment every time you make an improvement.