Matchdog

Matchdog is:

a kind of expelimental library to make sure how much useful pattern maching in the wild
dispaching HTTP reequest on the rack with using pattern maching

Installation

Add this line to your application's Gemfile:

gem 'matchdog'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install matchdog

Usage

Write config.ru.

# config.ru
require "matchdog"

class App
  # When you declare
  using Matchdog
  def call(env)
    # You can apply pattern maching for HTTP request on the rack
    case env
      in {REQUEST_METHOD: "GET", PATH_INFO: "/"}  # matches GET '/'
      [200, {}, ["This is the root directory."]]
      in {REQUEST_METHOD: "GET", PATH_INFO: path} # macthes GET without '/' and set path data in the request to `path` variable
      [200, {}, [path]]
      in {REQUEST_METHOD: "POST", "rack.input": input} # matches POST and set post data in the request to `input` variable
      [200, {}, [input.read]]
    end
  end
end

run App.new

Run ruckup command to start HTTP server.

❯ bundle exec rackup
/Users/niku/src/matchdog/config.ru:8: warning: Pattern matching is experimental, and the behavior may change in future versions of Ruby!
[2020-02-21 09:07:30] INFO  WEBrick 1.6.0
[2020-02-21 09:07:30] INFO  ruby 2.7.0 (2019-12-25) [x86_64-darwin18]
[2020-02-21 09:07:30] INFO  WEBrick::HTTPServer#start: pid=65361 port=9292

Test HTTP request and response

❯ bundle exec irb
irb(main):001:0> require "net/http"
=> true
irb(main):002:0> Net::HTTP.get(URI.parse("http://localhost:9292"))
=> "This is the root directory."
irb(main):003:0> Net::HTTP.get(URI.parse("http://localhost:9292/hello"))
=> "/hello"
irb(main):004:0> Net::HTTP.post(URI.parse("http://localhost:9292"), "You will receive this message").read_body
=> "You will receive this message"

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake test 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/niku/matchdog. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

License

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

Code of Conduct

Everyone interacting in the Matchdog project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.