hack: a sexy Haskell Webserver Interface

[ bsd3, deprecated, library, web ] [ Propose Tags ]
Deprecated. in favor of hack2
Versions [RSS] 2009.4.20, 2009.4.21, 2009.4.22, 2009.4.23, 2009.4.25, 2009.4.26, 2009.4.27, 2009.4.28, 2009.4.29, 2009.4.30, 2009.4.51, 2009.4.52, 2009.5.19, 2009.7.15, 2009.10.30, 2012.2.6
Change log changelog.md
Dependencies ansi-wl-pprint, base, base64-string, bytestring, cgi, containers, data-default (>=0.2), directory, filepath, haskell98, kibro (>=0.4.3), mps (>=2009.4.21), network, old-locale, old-time, template, time, unix, zlib [details]
License LicenseRef-GPL
Author Wang, Jinjing
Maintainer Wang, Jinjing <nfjinjing@gmail.com>
Category Web
Home page http://github.com/nfjinjing/hack/tree/master
Uploaded by JinjingWang at 2009-04-24T19:48:57Z
Distributions NixOS:2012.2.6
Downloads 11685 total (36 in the last 30 days)
Rating (no votes yet) [estimated by Bayesian average]
Your Rating
  • λ
  • λ
  • λ
Status Docs uploaded by user
Build status unknown [no reports yet]

Readme for hack-2009.4.25

[back to package description]

Hack: a sexy Haskell Webserver Interface

Hack is a brain-dead port of the brilliant Ruby Rack webserver interface.

What does a Hack app look like

module Main where

import Hack
import Hack.Handler.Kibro

hello :: Application
hello = \env -> return $ Response 
    { status  = 200
    , headers = [ ("Content-Type", "text/plain") ]
    , body    = "Hello World"

main = run hello

1 minute tutorial

Install Hack

cabal install hack

Install Kibro (the only handler at the moment)

cabal install kibro

Install lighttpd 1.4.19 (used by kibro)

wget http://www.lighttpd.net/download/lighttpd-1.4.19.tar.gz
tar zxfv lighttpd-1.4.19.tar.gz
cd lighttpd-1.4.19
./configure --prefix=$HOME
make install

Create a new Kibro project

kibro new hello-world

Test if Kibro works

cd hello-world
kibro start

Create a Hack app

put the following code in src/Main.hs

module Main where

import Hack
import Hack.Handler.Kibro

hello :: Application
hello = \env -> return $ Response 
    { status  = 200
    , headers = [ ("Content-Type", "text/plain") ]
    , body    = "Hello World"

main = run hello

restart kibro

kibro restart


demo usage of middleware

module Main where

import Hack
import Hack.Utils
import Hack.SimpleRoute
import Hack.Handler.Kibro

import Data.Default
import MPS
import Prelude hiding ((.))

hello :: Application
hello = \env -> def {body = env.show} .return

app :: Application
app = route [("/hello", hello), ("", hello)] empty_app

main = run app

create a middleware

inside Hack.hs:

type MiddleWare = Application -> Application

since Haskell has curry, middleware api can be of type

Anything -> Application -> Application

just pass an applied middleware into a chain.

finally the source code of SimpleRoute.hs:

{-# LANGUAGE QuasiQuotes #-}

module Hack.Contrib.SimpleRouter where

import Hack
import Hack.Utils
import List (find)
import Prelude hiding ((.), (^), (>))
import MPS

type RoutePath = (String, Application)

route :: [RoutePath] -> MiddleWare
route h _ = \env ->
  let path             = env.path_info
      script           = env.script_name
      mod_env location = env 
        { script_name  = script ++ location
        , path_info    = path.drop (location.length)
  case h.find (fst > flip starts_with path) of
    Nothing -> not_found [$here|Not Found: #{path}|]
    Just (location, app) -> app (mod_env location)

Use the middleware stack

Rack provides a builder DSL, Hack just use a function. From Utils.hs:

-- usage: app.use [content_type, cache]
use :: [MiddleWare] -> MiddleWare
use = reduce (<<<)


Just like Rack, once an application is written using Hack, it should work on any web server that provides a Hack handler. I'm only familiar with Kibro, so it became the first handler that's included.

The handler should expose only one function of type:

run :: Application -> IO ()


Hack spec = Rack spec :)

Please read The Rack interface specification.