Heroscale

This gem provides a Rack Interface to your Heroku web app that allows you to query the current HTTP_X_HEROKU_QUEUE_DEPTH for your app via an api handler

This allows you to query your app to get the queue size and current dyno count /heroscale/status

Installation (Rails 3)

To install Heroscale, just add the following line to your Gemfile:

gem "heroscale"

Then run bundle install

Deploy to Heroku and test that it works

After adding the gem and configuraton, go ahead and deploy to heroku

git push heroku master

Once you've deployed and everything seems to be working, go ahead and test it out by running

rake heroscale:test

This will query your heroku app and verify that it is returning the right response.

Securing

For most people, having the queue size and dynos on a publically available url is not a big deal. However if you want to secure it, just run:

rails g heroscale:secure

This will generate an config within config/initializers/heroscale.rb with a generated api key

Heroscale.configure do |c|
  c.api_key = "my_api_key"
end

Queries to your app will then need to be: /heroscale/status?api=my_api_key

Redeploy to Heroku and then run:

rake heroscale:test

to verify everything is still working

Installation (Sinatra)

Just add Heroscale::Middleware to your config.ru

TODO: more details

Installation (Rails 2)

TODO: more details