HHydra

Haskell based redirector server for A/B testing (built on Parsec monadic parser combinator)

Intro

HHydra is a standalone redirector server primary for complicated A/B testing. It uses special DSL to configure its redirections.

How to run HHydra

1. Compile it:

   cabal install

2. Run it:

   HHydra

HHydra listens to port 9000 by default and uses ./config file for configuration.

Configuration

Each line of ./config file follows this rule:

NAME <EXPRESSION[,EXPRESSION...]> [ADDRESS[,ADDRESS...]]

Where:

NAME is a rule name. It should not contain spaces.

EXPRESSION is a rule in reverse Polish notation. It can be templated using the following syntax: #{Header-name} . Supported operations are =~ (match by regexp) and == (strict match).

ADDRESS is http address to redirect

Config example

chr     <#{User-Agent} Chrome =~>                [http://chrome.ru]
jr      <#{Path} locale=en =~>                   [http://jetradar.com]
ab      <#{Path} /new/ab =~, #{Path} /new =~>    [http://a.search.aviasales.ru, http://b.search.aviasales.ru]
zx      <#{Path} / =~>                           [http://ya.ru]

For Develoment

How to make a sandbox:

cabal sandbox init
cabal install --only-dependencies
cabal install

HHydra

(add ~/.cabal/bin to your $PATH to run it w/o prefix)

Look http://www.haskell.org/cabal/users-guide/ for more info.