LiteSpeed Support Forums - Ruby Rack adapter request

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- - Ruby Rack adapter request (http://www.litespeedtech.com/support/forum/showthread.php?t=1665)

Ruby Rack adapter request

Rack [ http://rack.rubyforge.org/ ] - provides an minimal interface between webservers supporting Ruby and Ruby frameworks. Almost all recently releazed ruby frameworks (Ramaze, Sinatra etc.) using it. Creating LSAPI adapter for it will enable all of them (and the new onces comming) to run on litespeed.

What need to be done:
1. Rack Litespeed handler - {rack_path}/lib/rack/handler/litespeed.rb - i tryed to patch the CGI handler with:

Code:

def self.run(app, options=nil)

        while LSAPI.accept != nil

          serve app

        end

      end

but for some reason it not worked.

2. {lsws}/fcgi-bin/RackRunner.rb , similar to the RailsRunner.rb one. It will call the Rack::Handler::Litespeed directly or via {project_home}/start.rb

3. EasyRackWithSuEXEC VH Template

have you added "require lsapi" ?
other changes need to be made are
rack.run_once=false

LSAPI uses hash to store ENV, so need to do env=ENV.to_hash, just env=ENV

What i've done until now:

1. Handler modified:

Code:

require 'lsapi'



module Rack

  module Handler

    class Litespeed

      def self.run(app, options=nil)

        while LSAPI.accept != nil

          serve app

        end

      end



      def self.serve(app)

        env = ENV

        ...

                     "rack.run_once" => false,

2. Handler added to the {rack_path}/lib/rack.rb:

Code:

module Handler

    autoload :CGI, "rack/handler/cgi"

    autoload :Litespeed, "rack/handler/litespeed"

    ...

  end

3. External application created:

Code:

Name                                 rbLsapi

Address                                 uds://tmp/lshttpd/lsruby.sock

Notes                                 Not Set

Max Connections                 5        

Environment        

                                LSAPI_MAX_REQUESTS=500

                                LSAPI_CHILDREN=5

Initial Request Timeout (secs)        180

Retry Timeout (secs)                0

Persistent Connection                Not Set

Connection Keepalive Timeout        Not Set

Response Buffering                No

Auto Start                        Yes

Command                                $SERVER_ROOT/fcgi-bin/lsruby_runner.rb

Back Log                        50

Instances                        1

Run On Start Up                        Not Set

Max Idle Time                        Not Set

Priority                         3

Memory Soft Limit (bytes)        250M

Memory Hard Limit (bytes)        300M

Process Soft Limit                200

Process Hard Limit                200

4. Ruby scripts bound to the rbLsapi:

Code:

rb LiteSpeed API [Server Level]: rbLsapi

5. Simple script in $SERVER_ROOT/DEFAULT/html/simple.rb:

Code:

require 'rubygems'

require 'rack'

require 'lsapi'



class HelloWorld

  def call(env)

    [ 200, # HTTP Response Code

      { "Content-Type"=>"text/plain" }, # HTTP Headers

      [ "Hello, World!" ] # Body

    ]

  end

end



# Instantiate your app

app = HelloWorld.new



Rack::Handler::Litespeed.run app

The result: 500 Internal Server Error

In the error.log:

Code:

2008-01-11 12:54:47.088 [INFO] [rbLsapi] add child process pid: 3094

2008-01-11 12:54:47.088 [INFO] [rbLsapi] pid list size: 1

2008-01-11 12:54:47.218 [NOTICE] [192.168.3.81:54602-0#Example] Premature end of response header.

2008-01-11 12:55:03.555 [WARN] [192.168.3.81:54604-0#Example] LSAPI Packet header is invalid,('S','t','a','t','u','s',':',' ')

2008-01-11 12:55:03.555 [INFO] [192.168.3.81:54604-0#Example] connection to [uds://tmp/lshttpd/lsruby.sock] on request #0, error: Input/output error!

2008-01-11 12:55:03.555 [INFO] [uds://tmp/lshttpd/lsruby.sock] Connection error: Input/output error, adjust maximum connections to 4!

There is already a rack handler in the repo. I should know because I submitted it. I'm including my code that I know it works. I only changed one line in rack.rb and created lsws.rb myself. I changed the .rb extensions to .txt to upload.

Hope this helps,

AEM

Do not use lsruby_runner.rb, just run simple.rb directly by changing the command configuration, use a LSAPI context instead of *.rb script handler to invoke the app.

AEM's code should work.

And if you want to make your code works, I think you need a little more changes need to Hanlder::LiteSpeed,
All references to STDIN, STDOUT should be changed to use the object return by LSAPI.accept.

Thanks a lot mistwang and aemadrid. Problem solved - i used the aemadrid code. Working + no need to reinvent the wheel ;). Just a small question (or maybe i need to repost it in the usual RoR forum, not here):

Need I to create different socket for every external application I started in that way (LSAPI Ext App + Context)?

Best regards and thanks again

Glad to help. Let me know if you find something to improve.

AEM

Quote:

Originally Posted by zhesto (Post 8172)

Need I to create different socket for every external application I started in that way (LSAPI Ext App + Context)?

Yes, that's correct. The same for each rails application behind the scene.

If you guys can make it into the official rack package, it will be great.

Seems it's already in the official repository ( see http://chneukirchen.org/repos/rack/lib/rack/handler/ ), maybe thanks to aemadrid.

Sorry to resurrect a slightly old thread but how well was this working for you guys as currently, being a bit green when it comes to the whole rack thing, the only way I've managed to run a merb app on my server is by starting a thin or mongrel instance and then setting up a webserver proxy as an external app in my vhost.

It feels like more of a hack than anything (although it does offer remarkably good performance) so I'd like to be able to serve it via lsapi/rack but after playing around with the configuration used in here and trying numerous other things I've yet to have any success.