Heroku Scale Dyno From Ruby

I recently was working a project that requires a million+ jobs to process data. In order to process the data in a timely fashion I need to have a lot of workers, but I do not want to pay for them to run 24-7. I could manually scale them up before going to bed and turn them off when I go to bed, but I do want to manual do this. Heroku has an api that will allow me to scale the dyno up and down but was a little confusing to figure out at first.

I started looking through the Dyno section and there was nothing to update the count… It turns out they thought it would be a great idea to call it formation…

Before you are able to use the code below, you must configure environment variable for HEROKU_OAUTH_TOKEN and HEROKU_APP_NAME.

Heroku oAuth Token

To get a heroku oAuth token, you must run the following commands in terminal or go to https://dashboard.heroku.com/account/applications and create a new authorization.

heroku plugins:install heroku-cli-oauth
heroku authorizations:create -d "Platform API example token"

App name

HEROKU_APP_NAME is whatever you named the app on heroku that you want to control.

Fetching Count

Here is a snippet to fetch the count of dynos:

require 'platform-api'

heroku = PlatformAPI.connect_oauth(ENV['HEROKU_OAUTH_TOKEN'])

heroku.formation.info(ENV['HEROKU_APP_NAME'], type)['quantity']

Updating Count

Here is a snippet to update the count of dynos:

require 'platform-api'

heroku = PlatformAPI.connect_oauth(ENV['HEROKU_OAUTH_TOKEN'])

heroku.formation.update(ENV['HEROKU_APP_NAME'], type, { quantity: 1 })