No exception received from Rake task with Airbrake rails integration

Since version 5 Airbrake and its Rails integration offers automatic exception reporting in any Rake tasks. However I've not received rake exception on my errbit server.

I've made the following test :

Create a fresh rails 4.1 application.
Include airbrake gem.
Create Airbrake initializer (used an errbit configuration).
Add a rake task which raises an exception.

Gemfile

source 'https://rubygems.org'
gem 'rails', '4.1.6'
gem 'sqlite3'
gem 'sass-rails', '~> 4.0.3'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.0.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0',          group: :doc
gem 'spring',        group: :development

gem 'airbrake', '5.0.5'

initializers/airbrake.rb

Airbrake.configure do |config|
  config.environment = Rails.env
  config.host = 'https://xxxxxxxxxx.herokuapp.com/'
  config.project_id = true
  config.project_key = 'xxxxxxxxxxx'
  config.ignore_environments = []
end

lib/rake/raise.rake

namespace :raise do
  desc 'raise error'
  task error: :environment do
    1 / 0
  end
end

I tried to execute the rake task rake raise:error and got the following backtrace:

rake aborted!
ZeroDivisionError: divided by 0
/Users/Yann/code/airbraker/lib/tasks/raise.rake:4:in `/'
/Users/Yann/code/airbraker/lib/tasks/raise.rake:4:in `block (2 levels) in <top (required)>'
/Users/Yann/.gem/ruby/2.2.2/gems/airbrake-5.0.5/lib/airbrake/rake/task_ext.rb:19:in `execute'
Tasks: TOP => raise:error
(See full trace by running task with --trace)

And never received any exception on my errbit server.

Note: execute rake airbrake:test sends an exception to my errbit server, I assume my configuration is correct.

Am I missing something ?

Solution

This is a minor bug. The problem is that Airbrake tries to be asynchronous and sometimes it doesn't work as expected. In this particular case the Ruby process quits before Airbrake sends your exception.

I've submitted a patch, which should fix this issue: https://github.com/airbrake/airbrake/pull/513