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{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE BangPatterns #-}
module Main where
import Control.Exception (throwIO, throw)
import Control.Monad
import qualified Data.ByteString as S
--import Data.ByteString.Char8 (ByteString)
import qualified Data.ByteString.Char8 as B (unpack)
import qualified Network.HTTP.Types as H
import Network.Wai.Handler.Warp.Types
import Prelude hiding (lines)
import Data.ByteString.Internal
import Data.Word
import Foreign.ForeignPtr
import Foreign.Ptr
import Foreign.Storable
import Criterion.Main
-- $setup
-- >>> :set -XOverloadedStrings
----------------------------------------------------------------
main :: IO ()
main = do
let requestLine1 = "GET http://www.example.com HTTP/1.1"
let requestLine2 = "GET http://www.example.com/cgi-path/search.cgi?key=parser HTTP/1.0"
defaultMain [
bgroup "requestLine1" [
bench "parseRequestLine3" $ whnf parseRequestLine3 requestLine1
, bench "parseRequestLine2" $ parseRequestLine2 requestLine1
, bench "parseRequestLine1" $ parseRequestLine1 requestLine1
, bench "parseRequestLine0" $ parseRequestLine0 requestLine1
]
, bgroup "requestLine2" [
bench "parseRequestLine3" $ whnf parseRequestLine3 requestLine2
, bench "parseRequestLine2" $ parseRequestLine2 requestLine2
, bench "parseRequestLine1" $ parseRequestLine1 requestLine2
, bench "parseRequestLine0" $ parseRequestLine0 requestLine2
]
]
----------------------------------------------------------------
-- |
--
-- >>> parseRequestLine3 "GET / HTTP/1.1"
-- ("GET","/","",HTTP/1.1)
-- >>> parseRequestLine3 "POST /cgi/search.cgi?key=foo HTTP/1.0"
-- ("POST","/cgi/search.cgi","?key=foo",HTTP/1.0)
-- >>> parseRequestLine3 "GET "
-- *** Exception: BadFirstLine "GET "
-- >>> parseRequestLine3 "GET /NotHTTP UNKNOWN/1.1"
-- *** Exception: NonHttp
parseRequestLine3 :: ByteString
-> (H.Method
,ByteString -- Path
,ByteString -- Query
,H.HttpVersion)
parseRequestLine3 requestLine = ret
where
(!method,!rest) = S.breakByte 32 requestLine -- ' '
(!pathQuery,!httpVer')
| rest == "" = throw badmsg
| otherwise = S.breakByte 32 (S.drop 1 rest) -- ' '
(!path,!query) = S.breakByte 63 pathQuery -- '?'
!httpVer = S.drop 1 httpVer'
(!http,!ver)
| httpVer == "" = throw badmsg
| otherwise = S.breakByte 47 httpVer -- '/'
!hv | http /= "HTTP" = throw NonHttp
| ver == "/1.1" = H.http11
| otherwise = H.http10
!ret = (method,path,query,hv)
badmsg = BadFirstLine $ B.unpack requestLine
----------------------------------------------------------------
-- |
--
-- >>> parseRequestLine2 "GET / HTTP/1.1"
-- ("GET","/","",HTTP/1.1)
-- >>> parseRequestLine2 "POST /cgi/search.cgi?key=foo HTTP/1.0"
-- ("POST","/cgi/search.cgi","?key=foo",HTTP/1.0)
-- >>> parseRequestLine2 "GET "
-- *** Exception: BadFirstLine "GET "
-- >>> parseRequestLine2 "GET /NotHTTP UNKNOWN/1.1"
-- *** Exception: NonHttp
parseRequestLine2 :: ByteString
-> IO (H.Method
,ByteString -- Path
,ByteString -- Query
,H.HttpVersion)
parseRequestLine2 requestLine@(PS fptr off len) = withForeignPtr fptr $ \ptr -> do
when (len < 14) $ throwIO baderr
let methodptr = ptr `plusPtr` off
limptr = methodptr `plusPtr` len
lim0 = fromIntegral len
pathptr0 <- memchr methodptr 32 lim0 -- ' '
when (pathptr0 == nullPtr || (limptr `minusPtr` pathptr0) < 11) $
throwIO baderr
let pathptr = pathptr0 `plusPtr` 1
lim1 = fromIntegral (limptr `minusPtr` pathptr0)
httpptr0 <- memchr pathptr 32 lim1 -- ' '
when (httpptr0 == nullPtr || (limptr `minusPtr` httpptr0) < 9) $
throwIO baderr
let httpptr = httpptr0 `plusPtr` 1
lim2 = fromIntegral (httpptr0 `minusPtr` pathptr)
checkHTTP httpptr
!hv <- httpVersion httpptr
queryptr <- memchr pathptr 63 lim2 -- '?'
let !method = bs ptr methodptr pathptr0
!path
| queryptr == nullPtr = bs ptr pathptr httpptr0
| otherwise = bs ptr pathptr queryptr
!query
| queryptr == nullPtr = S.empty
| otherwise = bs ptr queryptr httpptr0
return (method,path,query,hv)
where
baderr = BadFirstLine $ B.unpack requestLine
check :: Ptr Word8 -> Int -> Word8 -> IO ()
check p n w = do
w0 <- peek $ p `plusPtr` n
when (w0 /= w) $ throwIO NonHttp
checkHTTP httpptr = do
check httpptr 0 72 -- 'H'
check httpptr 1 84 -- 'T'
check httpptr 2 84 -- 'T'
check httpptr 3 80 -- 'P'
check httpptr 4 47 -- '/'
check httpptr 6 46 -- '.'
httpVersion httpptr = do
major <- peek $ httpptr `plusPtr` 5
minor <- peek $ httpptr `plusPtr` 7
if major == (49 :: Word8) && minor == (49 :: Word8) then
return H.http11
else
return H.http10
bs ptr p0 p1 = PS fptr o l
where
o = p0 `minusPtr` ptr
l = p1 `minusPtr` p0
----------------------------------------------------------------
-- |
--
-- >>> parseRequestLine1 "GET / HTTP/1.1"
-- ("GET","/","",HTTP/1.1)
-- >>> parseRequestLine1 "POST /cgi/search.cgi?key=foo HTTP/1.0"
-- ("POST","/cgi/search.cgi","?key=foo",HTTP/1.0)
-- >>> parseRequestLine1 "GET "
-- *** Exception: BadFirstLine "GET "
-- >>> parseRequestLine1 "GET /NotHTTP UNKNOWN/1.1"
-- *** Exception: NonHttp
parseRequestLine1 :: ByteString
-> IO (H.Method
,ByteString -- Path
,ByteString -- Query
,H.HttpVersion)
parseRequestLine1 requestLine = do
let (!method,!rest) = S.breakByte 32 requestLine -- ' '
(!pathQuery,!httpVer') = S.breakByte 32 (S.drop 1 rest) -- ' '
!httpVer = S.drop 1 httpVer'
when (rest == "" || httpVer == "") $
throwIO $ BadFirstLine $ B.unpack requestLine
let (!path,!query) = S.breakByte 63 pathQuery -- '?'
(!http,!ver) = S.breakByte 47 httpVer -- '/'
when (http /= "HTTP") $ throwIO NonHttp
let !hv | ver == "/1.1" = H.http11
| otherwise = H.http10
return $! (method,path,query,hv)
----------------------------------------------------------------
-- |
--
-- >>> parseRequestLine0 "GET / HTTP/1.1"
-- ("GET","/","",HTTP/1.1)
-- >>> parseRequestLine0 "POST /cgi/search.cgi?key=foo HTTP/1.0"
-- ("POST","/cgi/search.cgi","?key=foo",HTTP/1.0)
-- >>> parseRequestLine0 "GET "
-- *** Exception: BadFirstLine "GET "
-- >>> parseRequestLine0 "GET /NotHTTP UNKNOWN/1.1"
-- *** Exception: NonHttp
parseRequestLine0 :: ByteString
-> IO (H.Method
,ByteString -- Path
,ByteString -- Query
,H.HttpVersion)
parseRequestLine0 s =
case filter (not . S.null) $ S.splitWith (\c -> c == 32 || c == 9) s of -- '
(method':query:http'') -> do
let !method = method'
!http' = S.concat http''
(!hfirst, !hsecond) = S.splitAt 5 http'
if hfirst == "HTTP/"
then let (!rpath, !qstring) = S.breakByte 63 query -- '?'
!hv =
case hsecond of
"1.1" -> H.http11
_ -> H.http10
in return $! (method, rpath, qstring, hv)
else throwIO NonHttp
_ -> throwIO $ BadFirstLine $ B.unpack s
|
