synapse

by Steven Swerling
http://tab-a.slot-z.net

DESCRIPTION:

Synapse is an application framework that does almost nothing. Basically this is just a tiny wrapper for the Rack::Router (see github.com/carllerche/rack-router)

very alpha-ish stuff here. Seems to work though.

SYNOPSIS:

Here is an example Synapse application (foo_app.rb):

require 'synapse'

class FooApp < Synapse::App

  def router
    @router ||= Rack::Router.new(nil, {}) do |r|
      r.map "/yip/",               :get, :to => self, :with => { :action => "yip" }
      r.map "/yap/:yap_variable",  :get, :to => self, :with => { :action => "yapfoo" }
      r.map "/yap/",               :get, :to => self, :with => { :action => "yap" }
      r.map "/:anything",          :get, :to => self, :with => { :action => "no_route" }
      r.map "/",                   :get, :to => self, :with => { :action => "home" }
    end
  end

  def yip; "yip"; end
  def yap; "yap"; end
  def home; "home"; end

  def no_route
    # Note: 'self.env' is the rack env
    self.response[:body] = "route not found for: '#{self.env['REQUEST_URI']}'"
    self.response[:status_code] = 404
  end

  def yapfoo
    "yapfoo, #{self.params[:yap_variable]}"
  end

end

And here is an example rack config, foo_app.ru:

require 'foo_app'
run FooApp.new.as_rack_app

Run FooApp w/ rackup or shotgun:

rackup --server=thin foo.ru -p 3000

  or

shotgun --server=thin foo.ru -p 3000

FEATURES

When a Synapse application handles a rack request, it

1. Duplicates self (so it’s thread safe)

2. Sets @response, @params, @env (the rack env)

3. Calls the action that Rack::Router route that matched. If the action returns a String, that is used for the @response

The @response is a hash used to return rack status code, headers hash, and body. Actions may do what they please with the response. Default response:

@response = {
  :status_code => 200,
  :headers => {'Content-Type' => 'text/html'},
  :body => nil
}

Actions are expected to side-effect the :status_code, :headers, and :body. As a convenience, if an action returns a string, it is assumed that that string is the :body. An exception is thrown if the :body is not set to something.

That’s it. Really not much to see here. Just gives you a thread-safe rack-based web framework that consists of nothing but a router.

PROBLEMS

None known.

REQUIREMENTS:

• rack

• Rack::Router (the rack-router gem), see github.com/carllerche/rack-router

INSTALL:

• first install rack and rack-router

• gem install synapse

Acknowledgements:

rack and rack-router were used, obviously. ‘bones’ used for gem generation.

LICENSE:

(The MIT License)

Copyright © 2009 Steven Swerling

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ‘Software’), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED ‘AS IS’, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.