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{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE OverloadedStrings #-}
module HttpReq (headers) where
import Common (pathTo, rechunkBS)
import Control.Applicative
import Criterion.Main (bench, bgroup, nf, nfIO)
import Control.DeepSeq (NFData(..))
import Criterion.Types (Benchmark)
import Network.Wai.Handler.Warp.RequestHeader (parseHeaderLines)
import Data.ByteString.Internal (c2w, w2c)
import qualified Data.Attoparsec.ByteString as AP
import qualified Data.Attoparsec.ByteString.Char8 as APC
import qualified Data.ByteString.Char8 as BC
import qualified Data.Binary.Parser as BP
import qualified Data.Binary.Parser.Char8 as BPC
import Network.HTTP.Types.Version (HttpVersion, http11)
import qualified Scanner as SC
headers :: IO [Benchmark]
headers = do
req <- BC.readFile =<< pathTo "http-request.txt"
return [
bench "http-req/attoparsec" $ nf (AP.parseOnly attoRequest) req
, bench "http-req/binary-parsers" $ nf (BP.parseOnly bpRequest) req
, bench "http-req/scanner" $ nf (SC.scanOnly scRequest) req
, bench "http-req/warp" $ nfIO (parseHeaderLines (BC.lines req))
]
--------------------------------------------------------------------------------
instance NFData HttpVersion where
rnf !_ = ()
attoHeader = do
name <- APC.takeWhile1 (APC.inClass "a-zA-Z0-9_-") <* APC.char ':' <* APC.skipSpace
body <- attoBodyLine
return (name, body)
attoBodyLine = APC.takeTill (\c -> c == '\r' || c == '\n') <* APC.endOfLine
attoReqLine = do
m <- (APC.takeTill APC.isSpace <* APC.char ' ')
(p,q) <- BC.break (=='?') <$> (APC.takeTill APC.isSpace <* APC.char ' ')
v <- attoHttpVersion
return (m,p,q,v)
attoHttpVersion = http11 <$ APC.string "HTTP/1.1"
attoRequest = (,) <$> (attoReqLine <* APC.endOfLine) <*> attoManyHeader
attoManyHeader = do
c <- APC.peekChar'
if c == '\r' || c == '\n'
then return []
else (:) <$> attoHeader <*> attoManyHeader
--------------------------------------------------------------------------------
bpHeader = do
name <- BPC.takeWhile1 isHeaderChar <* BPC.char ':' <* BP.skipSpaces
body <- bpBodyLine
return (name, body)
where
isHeaderChar c = ('a' <= c && c <= 'z')
|| ('A' <= c && c <= 'Z')
|| ('0' <= c && c <= '0')
|| c == '_' || c == '-'
bpBodyLine = BPC.takeTill (\c -> c == '\r' || c == '\n') <* BP.endOfLine
bpReqLine = do
m <- (BPC.takeTill BPC.isSpace <* BPC.char ' ')
(p,q) <- BC.break (=='?') <$> (BPC.takeTill BPC.isSpace <* BPC.char ' ')
v <- bpHttpVersion
return (m,p,q,v)
bpHttpVersion = http11 <$ BP.string "HTTP/1.1"
bpRequest = (,) <$> (bpReqLine <* BP.endOfLine) <*> bpManyHeader
bpManyHeader = do
c <- BPC.peek
if c == '\r' || c == '\n'
then return []
else (:) <$> bpHeader <*> bpManyHeader
--------------------------------------------------------------------------------
scHeader = do
name <- takeWhile1 (isHeaderChar . w2c) <* SC.char8 ':' <* SC.skipSpace
body <- scBodyLine
return (name, body)
where
isHeaderChar c = ('a' <= c && c <= 'z')
|| ('A' <= c && c <= 'Z')
|| ('0' <= c && c <= '0')
|| c == '_' || c == '-'
takeWhile1 p = do
bs <- SC.takeWhile p
if BC.null bs then fail "takeWhile1" else return bs
scEndOfLine = do -- scanner doesn't provide endOfLine, so we roll one here
w <- SC.anyWord8
case w of
10 -> return ()
13 -> SC.word8 10
_ -> fail "endOfLine"
{-# INLINE scEndOfLine #-}
scBodyLine = SC.takeWhile (\w -> let c = w2c w in c /= '\r' && c /= '\n') <* scEndOfLine
scReqLine = do
m <- (SC.takeWhile (not . BP.isSpace) <* SC.char8 ' ')
(p,q) <- BC.break (=='?') <$> (SC.takeWhile (not . BP.isSpace) <* SC.char8 ' ')
v <- scHttpVersion
return (m,p,q,v)
scHttpVersion = http11 <$ SC.string "HTTP/1.1"
scRequest = (,) <$> (scReqLine <* scEndOfLine) <*> scManyHeader
scManyHeader = do
w <- SC.lookAhead
case w of
Just w' -> do
let c = w2c w'
if c == '\r' || c == '\n'
then return []
else (:) <$> scHeader <*> scManyHeader
_ -> fail "scManyHeader"
|
