This is a Firebase Cloud Messaging server that is deployed to Heroku, which is used for device-to-device push notifications, on Android.

The main file is firebasepushserver.rb.

It is based on a file from codepath guides for FCM: https://guides.codepath.com/android/Google-Cloud-Messaging#step-3-setup-web-server

The above guide is a good way to get started and get a FCM server running locally on your machine. After that, I had to figure it out on my own. Getting it deployed to Heroku and working took me about 3 days.

The main difference from the sample code in the guide is that this version uses Postgres for its database.

Main changes I had to make after cloning the ruby-getting-started git repository from Heroku:

1. Add firebasepushserver.rb (based on codepath guide) and point the procfile to it. Replace YOUR-FIREBASE-SERVER-KEY with your server key.

2. Define AUTHORIZE_KEY in firebasepushserver.rb, which is the server key in the Firebase account for the app.

3. Change the Sequel connect call in firebasepushserver.rb to: DB = Sequel.connect(ENV['DATABASE_URL'])

4. Include references for Sinatra using this guide, in section Frameworks -> Sinatra: https://devcenter.heroku.com/articles/rack

5. Add "run Sinatra::Application" to config.ru

6. In Gemfile.lock, change tilt version to 1.4.1, since Sinatra doesn't work with tilt versions above 2.0.0

7. In Gemfile, set: ruby '2.3.3' gem 'tilt', '~> 1.4.1', group: :production gem 'sinatra' gem 'rest-client' gem 'sequel'

8. At top of firebasepushserver.rb, set: require 'pg' require 'json/ext'

9. In config/puma.rb, comment out first line: # workers Integer(ENV['WEB_CONCURRENCY'] || 2)

10. In database.yml, make sure adapter is postgresql

11. Change the remote git url's: https://help.github.com/articles/changing-a-remote-s-url/

12. HttpClientWrapperForFCM.java is the file for calling it from android

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ruby-getting-started

A barebones Rails app, which can easily be deployed to Heroku.

This application support the Getting Started with Ruby on Heroku article - check it out.

Running Locally

Make sure you have Ruby installed. Also, install the Heroku Toolbelt.

$ git clone [email protected]:heroku/ruby-getting-started.git
$ cd ruby-getting-started
$ bundle install
$ bundle exec rake db:create db:migrate
$ heroku local

Your app should now be running on localhost:5000.

Deploying to Heroku

$ heroku create
$ git push heroku master
$ heroku run rake db:migrate
$ heroku open

or

Docker

The app can be run and tested using the Heroku Docker CLI plugin.

Make sure the plugin is installed:

heroku plugins:install heroku-docker

Configure Docker and Docker Compose:

heroku docker:init

And run the app locally:

docker-compose up web

The app will now be available on the Docker daemon IP on port 8080.

To work with the local database and do migrations, you can open a shell:

docker-compose run shell
bundle exec rake db:migrate

You can also use Docker to release to Heroku:

heroku create
heroku docker:release
heroku open

Documentation

For more information about using Ruby on Heroku, see these Dev Center articles:

• Ruby on Heroku