Code Review: ironruby-rack


#1

http://github.com/jschementi/ironruby/tree/f57b6adec5fcb2896ed850683c0b1fd39ded23f0/Merlin/Main/Hosts/IronRuby.Rack

ironruby-rack: Run Rack-based web applications on IIS with IronRuby
What it is:
http://blog.jimmy.schementi.com/2009/05/ironruby-at-railsconf-2009.html#iis

Uses ASP.NET’s HttpHandlers to:

· Registering IronRuby.Rack in the Rack-based application’s
Web.confighttp://github.com/jschementi/ironruby/blob/92932a672921a03210c8aefe23ac0a7d6996ed2d/Merlin/Main/Hosts/IronRuby.Rack/IronRuby.Rack.Example/Web.config

· Load a Rackhttp://rack.rubyforge.org/-based application on
startup
(HttpHandlerFactoryhttp://github.com/jschementi/ironruby/blob/92932a672921a03210c8aefe23ac0a7d6996ed2d/Merlin/Main/Hosts/IronRuby.Rack/HttpHandlerFactory.cs
and
Applicationhttp://github.com/jschementi/ironruby/blob/92932a672921a03210c8aefe23ac0a7d6996ed2d/Merlin/Main/Hosts/IronRuby.Rack/Application.cs
constructor).

o Initializes Rack and runs the application’s
config.ruhttp://github.com/jschementi/ironruby/blob/92932a672921a03210c8aefe23ac0a7d6996ed2d/Merlin/Main/Hosts/IronRuby.Rack/IronRuby.Rack.Example/config.ru,
which tells Rack what application (any Ruby object that responds to
“call”)

· Intercept web requests
(HttpHandler.ProcessRequesthttp://github.com/jschementi/ironruby/blob/92932a672921a03210c8aefe23ac0a7d6996ed2d/Merlin/Main/Hosts/IronRuby.Rack/HttpHandler.cs)

o Creates a
Requesthttp://github.com/jschementi/ironruby/blob/92932a672921a03210c8aefe23ac0a7d6996ed2d/Merlin/Main/Hosts/IronRuby.Rack/Request.cs
and a
Responsehttp://github.com/jschementi/ironruby/blob/92932a672921a03210c8aefe23ac0a7d6996ed2d/Merlin/Main/Hosts/IronRuby.Rack/Response.cs,
and passes it off to
IIS.Handlehttp://github.com/jschementi/ironruby/blob/92932a672921a03210c8aefe23ac0a7d6996ed2d/Merlin/Main/Hosts/IronRuby.Rack/IIS.cs#L31
which:

§ Set up the environment according to the Rack
specificationhttp://rack.rubyforge.org/doc/SPEC.html

§ Calls
Application.Callhttp://github.com/jschementi/ironruby/blob/92932a672921a03210c8aefe23ac0a7d6996ed2d/Merlin/Main/Hosts/IronRuby.Rack/Application.cs#L32
with the prepared environment, which delegates to the Rack application’s
“call” method (registered in the config.ru file). All C# <-> Ruby
interaction happens in the
RubyEnginehttp://github.com/jschementi/ironruby/blob/92932a672921a03210c8aefe23ac0a7d6996ed2d/Merlin/Main/Hosts/IronRuby.Rack/RubyEngine.cs

§ Rack application does its thing (process Rails/Sinatra request, or
deal with things
itselfhttp://github.com/jschementi/ironruby/blob/92932a672921a03210c8aefe23ac0a7d6996ed2d/Merlin/Main/Hosts/IronRuby.Rack/IronRuby.Rack.Example/app.rb)
and returns a response according to the Rack
specificationhttp://rack.rubyforge.org/doc/SPEC.html

§ Takes the Rack response and pass the appropriate data to the IIS
response (response body, status, headers)