---

The default web server of the Crystal is quite good :smile: but it weak at routing :cry:.
Kemal or other web frameworks written in Crystal are awesome :smile:, but it's too fat for some purpose :cry:.

router.cr is a minimum but High Performance middleware for Crystal web server.
See the amazing performance of router.cr here.:rocket:

Installation

Add this to your application's shard.yml:

dependencies:
  router:
    github: tbrand/router.cr

Usage

Basic usage

require "router"

Include Router to utilize router.cr.

class WebServer
  include Router
end

Define a method to draw all routes for your web server.

class WebServer
  include Router
  
  def draw_routes
    # Drawing routes HERE!
  end
end

In that method, call HTTP method name (downcase) like get or post with PATH and BLOCK where

• PATH : String
• BLOCK : block of HTTP::Server::Context, Hash(String, String) -> HTTP::Server::Context

class WebServer
  include Router

  def draw_routes
    get "/" do |context, params|
      context.response.print "Hello router.cr!"
      context
    end
  end
end

Here we've defined a GET route at root path (/) that just print out "Hello router.cr" when we get access. To activate (run) the route, just define run methods for your server with route_handler

class WebServer
  include Router
  
  def draw_routes
    get "/" do |context, params|
      context.response.print "Hello router.cr!"
      context
    end
  end
  
  def run
    server = HTTP::Server.new(route_handler)
    server.bind_tcp 8080
    server.listen
  end
end

Here route_handler is getter defined in Router. So you can call route_handler at anywhere in WebServer instance.

Finally, run your server.

web_server = WebServer.new
web_server.draw_routes
web_server.run

See sample and tips for details.

Path parameters

params is a Hash(String, String) that is used when you define a path parameters such as /user/:id (:id is a parameters). Here is an example.

class WebServer
  include Router

  def draw_routes
    get "/user/:id" do |context, params|
      context.response.print params["id"] # get :id in url from params
      context
    end
  end
end

See sample and tips for details.

Contributing

1. Fork it ( https://github.com/tbrand/router.cr/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

Contributors

• tbrand Taichiro Suzuki - creator, maintainer