43 lines
1.2 KiB
Haskell
43 lines
1.2 KiB
Haskell
{-# LANGUAGE ExistentialQuantification #-}
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{-# LANGUAGE MultiParamTypeClasses #-}
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{-# LANGUAGE FunctionalDependencies #-}
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---------------------------------------------------------
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--
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-- Module : Web.Restful.Handler
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-- Copyright : Michael Snoyman
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-- License : BSD3
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--
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-- Maintainer : Michael Snoyman <michael@snoyman.com>
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-- Stability : unstable
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-- Portability : portable
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--
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-- Define Handler stuff.
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--
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---------------------------------------------------------
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module Web.Restful.Handler
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( Handler (..)
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, runHandler
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, HandlerMap
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, liftHandler
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) where
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import Web.Restful.Definitions
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import Web.Restful.Request
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import Web.Restful.Response
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data Handler = forall req. Request req => Handler (req -> IO ResponseWrapper)
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runHandler :: Handler -> RawRequest -> IO ResponseWrapper
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runHandler (Handler f) rreq = do
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let rparser = parseRequest
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case runRequestParser rparser rreq of
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Left errors -> fail $ unlines errors -- FIXME
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Right req -> f req
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type HandlerMap a = a -> Verb -> Maybe Handler
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liftHandler :: (Request req, Response res)
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=> (req -> IO res)
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-> Maybe Handler
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liftHandler f = Just . Handler $ fmap ResponseWrapper . f
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