Purr Server

This is the server part of Purr responsible for socket hijacking and forwarding TCP traffic to the remote endpoint.

Installation

Add this line to your application's Gemfile:

gem 'purr'

And then execute:

$ bundle

Or install it yourself as:

$ gem install purr

Usage

The server needs to be wrapped as a Rack application and it's necessary to pass a block that takes one argument. This block should implement the TCP remote endpoint selection based on the env variable passed from the Rack context. The endpoint should be in the form of a two element array containing the host as a string and the port as an integer. There is a basic logging support implemented, but it is requires the Rack::Logger middleware to be included.

# purr.ru
require 'purr'

# Turn on the optional logging feature
use Rack::Logger

app = Purr.server do |env|
  # Maybe do some database lookup based on the Rack environment
  # ...
  # Return with the remote endpoint
  ['localhost', 22]
end

run app

The application can be started using rackup:

rackup purr.ru

Note that the application requires a web server with socket hijacking support, i.e. you can't use WEBrick.

Reverse proxy support

• TODO: Describe websocket compatibility mode and how it works with Apache mod_proxy_wstunnel
• TODO: Test with nginx

Development

After checking out the repo, run bin/setup in the server subdirectory to install dependencies. 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/skateman/purr.

License

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