Connfuse

Connfuse is a Ruby circuit breaker gem. It lets your application fail fast from failures of its service dependencies. It wraps calls to external services and monitors for failures.

Installation

Add this line to your application's Gemfile:

gem 'connfuse'

And then execute:

$ bundle

Or install it yourself as:

$ gem install connfuse

Usage

You can use Circuit class directly:

  circuit = Connfuse::Circuit.new
  circuit.pass_thru do
    some_transport.data.get(params)
  end

Or you can include Connfuse module in your class and specify methods:

class Foo
  include Connfuse

  def bar
    # do something
  end

  fuse_for :bar
end

Circuit will be initialized for your class automatically or you can specify parameters:

class Foo
  include Connfuse
  circuit(limit: 5, timeout: 15, expected_errors: [SomeErrorClass])

  # ...
end

• limit - number of attempts to execute method before circuit will be broken.
• timeout - specify time until the next attempt to execute methods when circuit is broken.
• expected_errors - array of error classes which do not count as errors of circuit.

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/rutaka-n/connfuse. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

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