Nexaas::QueueTime

Installation

Add this line to your application's Gemfile:

gem 'nexaas-queue_time'

And then execute:

$ bundle

Or install it yourself as:

$ gem install nexaas-queue_time

Usage

Rails initialization

Add this gem to the Middleware stack before Rack::Runtime, like this:

require "nexaas/queue_time/middleware"
config.middleware.insert_before Rack::Runtime, Nexaas::QueueTime::Middleware

You can place it in config/application.rb or in a specific environment file, such as config/environments/production.rb

This code can also be placed in an initializer file, such as config/initializers/middlewares.rb:

Rails.env.on(:any) do |config|
  require "nexaas/queue_time/middleware"
  config.middleware.insert_before Rack::Runtime, Nexaas::QueueTime::Middleware
end

Header requirement

For the gem to work, someone must set the header X-Request-Start with the format t=timestamp, where timestamp is the UNIX timestamp. This someone could be a load balancer, reverse proxy or router. Heroku already does that for you automatically.

DogStatsD

After calculating the queue_time, this gem sends it to a DogStatsD server via UDS.

Without the DogStatsD agent this gem is pretty much useless.

Sidekiq metrics collector

This gem comes with a binary called sidekiq_metric_collector. This binary will send to DogStatsD the latency for all Sidekiq queues every 10 seconds.

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/myfreecomm/nexaas-queue_time.

License

The gem is available as open source under the terms of the MIT License.