GoogleSubscriber

GoogleSubscribers discovers your ruby google pub/sub subscribers and provides a rake task for starting them

Installation

Add this line to your application's Gemfile:

gem 'google-subscriber'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install google-subscriber

Usage

Add a google_subscriber.rb file to in your Rails.root/config/initializers/ directory

require 'google_subscriber'
GoogleSubscriber.configure do |config|
  config.subscriber_paths += %W( #{Rails.root}/app/subscribers ) 
  config.logger = Rails.logger
  # https://cloud.google.com/docs/authentication/production#auth-cloud-implicit-ruby
  config.google_credentials = '/path/to/cred/file.json' # or File.read('/path/to/cred/file.json')
  config.google_project_id = 'my-gcp-project-id'
end

Subscribers

1. Add Subscribers to Rails.root/app/subscribers
2. Subscribers should subclass GoogleSubscriber::BaseSubscriber

Example:

class FooSubscriber < GoogleSubscriber::BaseSubscriber
  subscription_id 'my-subscription-id' # https://cloud.google.com/pubsub/docs/pull#ruby
  subscription_listen_args({ threads: { callback: 16 } }) # https://googleapis.dev/ruby/google-cloud-pubsub/latest/Google/Cloud/PubSub/Subscription.html#listen-instance_method

  # optionally override config.google_credentials
  # subscription_credentials '/path/to/cred/file.json' # or File.read('/path/to/cred/file.json')

  # optionally override config.subscription_project_id
  # subscription_project_id 'my-gcp-project-id'

  # @param [Class: Google::Cloud::PubSub::ReceivedMessage] received_message The received_message
  def on_received_message(received_message)
    # do something exciting with received_message
    message.acknowledge!
  end
end

If the log-level is set to DEBUG, log messages such as "the service ws unable to fulfill your request" could show up. It seems this is an internal transient error. Subsequent retries succeed.

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/perryqh/google-subscriber-ruby

License

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