warp-1.2.1: Network/Wai/Handler/Warp.hs
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE CPP #-}
{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE MagicHash #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# OPTIONS_GHC -fno-warn-warnings-deprecations #-}
---------------------------------------------------------
--
-- Module : Network.Wai.Handler.Warp
-- Copyright : Michael Snoyman
-- License : BSD3
--
-- Maintainer : Michael Snoyman <michael@snoyman.com>
-- Stability : Stable
-- Portability : portable
--
-- A fast, light-weight HTTP server handler for WAI.
--
---------------------------------------------------------
-- | A fast, light-weight HTTP server handler for WAI.
module Network.Wai.Handler.Warp
( -- * Run a Warp server
run
, runSettings
, runSettingsSocket
-- * Settings
, Settings
, defaultSettings
, settingsPort
, settingsHost
, settingsOnException
, settingsTimeout
, settingsIntercept
, settingsManager
-- ** Data types
, HostPreference (..)
-- * Connection
, Connection (..)
, runSettingsConnection
-- * Datatypes
, Port
, InvalidRequest (..)
-- * Internal
, Manager
, withManager
, parseRequest
, sendResponse
, registerKillThread
, pause
, resume
, T.cancel
, T.register
, T.initialize
#if TEST
, takeHeaders
, readInt
#endif
) where
import Prelude hiding (lines)
import Network.Wai
import Data.ByteString (ByteString)
import qualified Data.ByteString as S
import qualified Data.ByteString.Unsafe as SU
import qualified Data.ByteString.Char8 as B
import qualified Data.ByteString.Lazy as L
import Network (sClose, Socket)
import Network.Socket (accept, SockAddr)
import qualified Network.Socket.ByteString as Sock
import Control.Exception
( mask, handle, onException, bracket
, Exception, SomeException
, fromException, AsyncException (ThreadKilled)
, try
#if GLASGOW_HASKELL >= 721
, allowInterrupt
#else
, unblock
#endif
#if WINDOWS
, finally
#endif
)
import Control.Concurrent (forkIO)
import Data.Maybe (fromMaybe, isJust)
import Data.Char (toLower, isHexDigit)
import Data.Word (Word)
import Data.Typeable (Typeable)
import Data.Conduit (ResourceT, runResourceT)
import qualified Data.Conduit as C
import qualified Data.Conduit.List as CL
import qualified Data.Conduit.Binary as CB
import Data.Conduit.Blaze (builderToByteString)
import Control.Exception.Lifted (throwIO)
import Blaze.ByteString.Builder.HTTP
(chunkedTransferEncoding, chunkedTransferTerminator)
import Blaze.ByteString.Builder
(copyByteString, Builder, toLazyByteString, toByteStringIO, flush)
import Blaze.ByteString.Builder.Char8 (fromChar, fromShow)
import Data.Monoid (mappend, mempty)
import Network.Sendfile
import qualified System.PosixCompat.Files as P
import Control.Monad.IO.Class (MonadIO, liftIO)
import Control.Monad.Trans.Class (lift)
import qualified Timeout as T
import Timeout (Manager, registerKillThread, pause, resume)
import Data.Word (Word8)
import Data.List (foldl')
import Control.Monad (forever, when, void)
import qualified Network.HTTP.Types as H
import qualified Data.CaseInsensitive as CI
import System.IO (hPrint, stderr)
import ReadInt (readInt64)
import qualified Data.IORef as I
import Data.Conduit.Network (bindPort, HostPreference (HostIPv4))
#if WINDOWS
import Control.Concurrent (threadDelay)
import qualified Control.Concurrent.MVar as MV
import Network.Socket (withSocketsDo)
#endif
import Data.Version (showVersion)
import qualified Paths_warp
warpVersion :: String
warpVersion = showVersion Paths_warp.version
#if GLASGOW_HASKELL < 721
allowInterrupt :: IO ()
allowInterrupt = unblock $ return ()
#endif
-- |
--
-- In order to provide slowloris protection, Warp provides timeout handlers. We
-- follow these rules:
--
-- * A timeout is created when a connection is opened.
--
-- * When all request headers are read, the timeout is tickled.
--
-- * Every time at least 2048 bytes of the request body are read, the timeout
-- is tickled.
--
-- * The timeout is paused while executing user code. This will apply to both
-- the application itself, and a ResponseSource response. The timeout is
-- resumed as soon as we return from user code.
--
-- * Every time data is successfully sent to the client, the timeout is tickled.
data Connection = Connection
{ connSendMany :: [B.ByteString] -> IO ()
, connSendAll :: B.ByteString -> IO ()
, connSendFile :: FilePath -> Integer -> Integer -> IO () -> IO () -- ^ offset, length
, connClose :: IO ()
, connRecv :: IO B.ByteString
}
socketConnection :: Socket -> Connection
socketConnection s = Connection
{ connSendMany = Sock.sendMany s
, connSendAll = Sock.sendAll s
, connSendFile = \fp off len act -> sendfile s fp (PartOfFile off len) act
, connClose = sClose s
, connRecv = Sock.recv s bytesPerRead
}
-- | Run an 'Application' on the given port. This calls 'runSettings' with
-- 'defaultSettings'.
run :: Port -> Application -> IO ()
run p = runSettings defaultSettings { settingsPort = p }
-- | Run a Warp server with the given settings.
runSettings :: Settings -> Application -> IO ()
#if WINDOWS
runSettings set app = withSocketsDo $ do
var <- MV.newMVar Nothing
let clean = MV.modifyMVar_ var $ \s -> maybe (return ()) sClose s >> return Nothing
_ <- forkIO $ bracket
(bindPort (settingsPort set) (settingsHost set))
(const clean)
(\s -> do
MV.modifyMVar_ var (\_ -> return $ Just s)
runSettingsSocket set s app)
forever (threadDelay maxBound) `finally` clean
#else
runSettings set =
bracket
(bindPort (settingsPort set) (settingsHost set))
sClose .
flip (runSettingsSocket set)
#endif
type Port = Int
-- | Same as 'runSettings', but uses a user-supplied socket instead of opening
-- one. This allows the user to provide, for example, Unix named socket, which
-- can be used when reverse HTTP proxying into your application.
--
-- Note that the 'settingsPort' will still be passed to 'Application's via the
-- 'serverPort' record.
runSettingsSocket :: Settings -> Socket -> Application -> IO ()
runSettingsSocket set socket app =
runSettingsConnection set getter app
where
getter = do
(conn, sa) <- accept socket
return (socketConnection conn, sa)
runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()
runSettingsConnection set getConn app = do
let onE = settingsOnException set
port = settingsPort set
tm <- maybe (T.initialize $ settingsTimeout set * 1000000) return
$ settingsManager set
mask $ \restore -> forever $ do
allowInterrupt
(conn, addr) <- getConn
void $ forkIO $ do
th <- T.registerKillThread tm
handle onE $ (do restore $ serveConnection set th port app conn addr
connClose conn >> T.cancel th
) `onException` (T.cancel th >> connClose conn)
-- | Contains a @Source@ and a byte count that is still to be read in.
newtype IsolatedBSSource = IsolatedBSSource (I.IORef (Int, C.Source (ResourceT IO) ByteString))
-- | Given an @IsolatedBSSource@ provide a @Source@ that only allows up to the
-- specified number of bytes to be passed downstream. All leftovers should be
-- retained within the @Source@. If there are not enough bytes available,
-- throws a @ConnectionClosedByPeer@ exception.
ibsIsolate :: IsolatedBSSource -> C.Source (ResourceT IO) ByteString
ibsIsolate ibs@(IsolatedBSSource ref) =
C.PipeM pull (return ())
where
pull = do
(count, src) <- liftIO $ I.readIORef ref
if count == 0
-- No more bytes wanted downstream, so we're done.
then return $ C.Done Nothing ()
else do
-- Get the next chunk (if available) and the updated source
(src', mbs) <- src C.$$+ CL.head
-- If no chunk available, then there aren't enough bytes in the
-- stream. Throw a ConnectionClosedByPeer
bs <- maybe (liftIO $ throwIO ConnectionClosedByPeer) return mbs
let -- How many of the bytes in this chunk to send downstream
toSend = min count (S.length bs)
-- How many bytes will still remain to be sent downstream
count' = count - toSend
case () of
()
-- The expected count is greater than the size of the
-- chunk we just read. Send the entire chunk
-- downstream, and then loop on this function for the
-- next chunk.
| count' > 0 -> do
liftIO $ I.writeIORef ref (count', src')
return $ C.HaveOutput (ibsIsolate ibs) (return ()) bs
-- The expected count is the total size of the chunk we
-- just read. Send this chunk downstream, and then
-- terminate the stream.
| count == S.length bs -> do
liftIO $ I.writeIORef ref (count', src')
return $ C.HaveOutput (C.Done Nothing ()) (return ()) bs
-- Some of the bytes in this chunk should not be sent
-- downstream. Split up the chunk into the sent and
-- not-sent parts, add the not-sent parts onto the new
-- source, and send the rest of the chunk downstream.
| otherwise -> do
let (x, y) = S.splitAt toSend bs
liftIO $ I.writeIORef ref (count', C.HaveOutput src' (return ()) y)
return $ C.HaveOutput (C.Done Nothing ()) (return ()) x
-- | Extract the underlying @Source@ from an @IsolatedBSSource@, which will not
-- perform any more isolation.
ibsDone :: IsolatedBSSource -> IO (C.Source (ResourceT IO) ByteString)
ibsDone (IsolatedBSSource ref) = fmap snd $ I.readIORef ref
serveConnection :: Settings
-> T.Handle
-> Port -> Application -> Connection -> SockAddr-> IO ()
serveConnection settings th port app conn remoteHost' =
runResourceT serveConnection'
where
serveConnection' :: ResourceT IO ()
serveConnection' = do
let fromClient = connSource conn th
serveConnection'' fromClient
serveConnection'' fromClient = do
(env, getSource) <- parseRequest conn port remoteHost' fromClient
case settingsIntercept settings env of
Nothing -> do
-- Let the application run for as long as it wants
liftIO $ T.pause th
res <- app env
-- flush the rest of the request body
requestBody env C.$$ CL.sinkNull
fromClient' <- liftIO getSource
liftIO $ T.resume th
keepAlive <- sendResponse th env conn res
when keepAlive $ serveConnection'' fromClient'
Just intercept -> do
liftIO $ T.pause th
fromClient' <- liftIO getSource
intercept fromClient' conn
parseRequest :: Connection -> Port -> SockAddr
-> C.Source (ResourceT IO) S.ByteString
-> ResourceT IO (Request, IO (C.Source (ResourceT IO) ByteString))
parseRequest conn port remoteHost' src1 = do
(src2, headers') <- src1 C.$$+ takeHeaders
parseRequest' conn port headers' remoteHost' src2
-- FIXME come up with good values here
bytesPerRead, maxTotalHeaderLength :: Int
bytesPerRead = 4096
maxTotalHeaderLength = 50 * 1024
data InvalidRequest =
NotEnoughLines [String]
| BadFirstLine String
| NonHttp
| IncompleteHeaders
| ConnectionClosedByPeer
| OverLargeHeader
deriving (Show, Typeable, Eq)
instance Exception InvalidRequest
handleExpect :: Connection
-> H.HttpVersion
-> ([H.Header] -> [H.Header])
-> [H.Header]
-> IO [H.Header]
handleExpect _ _ front [] = return $ front []
handleExpect conn hv front (("expect", "100-continue"):rest) = do
connSendAll conn $
if hv == H.http11
then "HTTP/1.1 100 Continue\r\n\r\n"
else "HTTP/1.0 100 Continue\r\n\r\n"
return $ front rest
handleExpect conn hv front (x:xs) = handleExpect conn hv (front . (x:)) xs
-- | Parse a set of header lines and body into a 'Request'.
parseRequest' :: Connection
-> Port
-> [ByteString]
-> SockAddr
-> C.Source (ResourceT IO) S.ByteString -- FIXME was buffered
-> ResourceT IO (Request, IO (C.Source (ResourceT IO) ByteString))
parseRequest' _ _ [] _ _ = throwIO $ NotEnoughLines []
parseRequest' conn port (firstLine:otherLines) remoteHost' src = do
(method, rpath', gets, httpversion) <- parseFirst firstLine
let (host',rpath)
| S.null rpath' = ("", "/")
| "http://" `S.isPrefixOf` rpath' = S.breakByte 47 $ S.drop 7 rpath'
| otherwise = ("", rpath')
heads <- liftIO
$ handleExpect conn httpversion id
(map parseHeaderNoAttr otherLines)
let host = fromMaybe host' $ lookup "host" heads
let len0 =
case lookup "content-length" heads of
Nothing -> 0
Just bs -> readInt bs
let serverName' = takeUntil 58 host -- ':'
let chunked = maybe False ((== "chunked") . B.map toLower)
$ lookup "transfer-encoding" heads
(rbody, getSource) <- liftIO $
if chunked
then do
ref <- I.newIORef (src, NeedLen)
return (chunkedSource ref, fmap fst $ I.readIORef ref)
else do
ibs <- fmap IsolatedBSSource $ I.newIORef (len0, src)
return (ibsIsolate ibs, ibsDone ibs)
return (Request
{ requestMethod = method
, httpVersion = httpversion
, pathInfo = H.decodePathSegments rpath
, rawPathInfo = rpath
, rawQueryString = gets
, queryString = H.parseQuery gets
, serverName = serverName'
, serverPort = port
, requestHeaders = heads
, isSecure = False
, remoteHost = remoteHost'
, requestBody = rbody
, vault = mempty
}, getSource)
data ChunkState = NeedLen
| NeedLenNewline
| HaveLen Word
chunkedSource :: MonadIO m
=> I.IORef (C.Source m ByteString, ChunkState)
-> C.Source m ByteString
chunkedSource ipair = do
(src, mlen) <- liftIO $ I.readIORef ipair
go src mlen
where
go' src front = do
(src', (len, bs)) <- lift $ src C.$$+ front getLen
let src''
| S.null bs = src'
| otherwise = C.yield bs >> src'
go src'' $ HaveLen len
go src NeedLen = go' src id
go src NeedLenNewline = go' src (CB.take 2 >>)
go src (HaveLen 0) = liftIO $ I.writeIORef ipair (src, HaveLen 0)
go src (HaveLen len) = do
(src', mbs) <- lift $ src C.$$+ CL.head
case mbs of
Nothing -> liftIO $ I.writeIORef ipair (src', HaveLen 0)
Just bs ->
case S.length bs `compare` fromIntegral len of
EQ -> yield' src' NeedLenNewline bs
LT -> do
let mlen = HaveLen $ len - fromIntegral (S.length bs)
yield' src' mlen bs
GT -> do
let (x, y) = S.splitAt (fromIntegral len) bs
let src'' = C.yield y >> src'
yield' src'' NeedLenNewline x
yield' src mlen bs = do
liftIO $ I.writeIORef ipair (src, mlen)
C.yield bs
go src mlen
getLen :: Monad m => C.Sink ByteString m (Word, ByteString)
getLen = do
mbs <- CL.head
case mbs of
Nothing -> return (0, S.empty)
Just bs -> do
(x, y) <-
case S.breakByte 10 bs of
(x, y)
| S.null y -> do
mbs2 <- CL.head
case mbs2 of
Nothing -> return (x, y)
Just bs2 -> return $ S.breakByte 10 $ bs `S.append` bs2
| otherwise -> return (x, y)
let w =
S.foldl' (\i c -> i * 16 + fromIntegral (hexToWord c)) 0
$ B.takeWhile isHexDigit x
return (w, S.drop 1 y)
hexToWord w
| w < 58 = w - 48
| w < 71 = w - 55
| otherwise = w - 87
takeUntil :: Word8 -> ByteString -> ByteString
takeUntil c bs =
case S.elemIndex c bs of
Just !idx -> SU.unsafeTake idx bs
Nothing -> bs
{-# INLINE takeUntil #-}
parseFirst :: ByteString
-> ResourceT IO (ByteString, ByteString, ByteString, H.HttpVersion)
parseFirst s =
case S.split 32 s of -- ' '
[method, query, http'] -> do
let (hfirst, hsecond) = B.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
{-# INLINE parseFirst #-} -- FIXME is this inline necessary? the function is only called from one place and not exported
httpBuilder, spaceBuilder, newlineBuilder, transferEncodingBuilder
, colonSpaceBuilder :: Builder
httpBuilder = copyByteString "HTTP/"
spaceBuilder = fromChar ' '
newlineBuilder = copyByteString "\r\n"
transferEncodingBuilder = copyByteString "Transfer-Encoding: chunked\r\n\r\n"
colonSpaceBuilder = copyByteString ": "
headers :: H.HttpVersion -> H.Status -> H.ResponseHeaders -> Bool -> Builder
headers !httpversion !status !responseHeaders !isChunked' = {-# SCC "headers" #-}
let !start = httpBuilder
`mappend` copyByteString
(case httpversion of
H.HttpVersion 1 1 -> "1.1"
_ -> "1.0")
`mappend` spaceBuilder
`mappend` fromShow (H.statusCode status)
`mappend` spaceBuilder
`mappend` copyByteString (H.statusMessage status)
`mappend` newlineBuilder
!start' = foldl' responseHeaderToBuilder start (serverHeader responseHeaders)
!end = if isChunked'
then transferEncodingBuilder
else newlineBuilder
in start' `mappend` end
responseHeaderToBuilder :: Builder -> H.Header -> Builder
responseHeaderToBuilder b (x, y) = b
`mappend` copyByteString (CI.original x)
`mappend` colonSpaceBuilder
`mappend` copyByteString y
`mappend` newlineBuilder
checkPersist :: Request -> Bool
checkPersist req
| ver == H.http11 = checkPersist11 conn
| otherwise = checkPersist10 conn
where
ver = httpVersion req
conn = lookup "connection" $ requestHeaders req
checkPersist11 (Just x)
| CI.foldCase x == "close" = False
checkPersist11 _ = True
checkPersist10 (Just x)
| CI.foldCase x == "keep-alive" = True
checkPersist10 _ = False
isChunked :: H.HttpVersion -> Bool
isChunked = (==) H.http11
hasBody :: H.Status -> Request -> Bool
hasBody s req = s /= H.Status 204 "" && s /= H.status304 &&
H.statusCode s >= 200 && requestMethod req /= "HEAD"
sendResponse :: T.Handle
-> Request -> Connection -> Response -> ResourceT IO Bool
sendResponse th req conn r = sendResponse' r
where
version = httpVersion req
isPersist = checkPersist req
isChunked' = isChunked version
needsChunked hs = isChunked' && not (hasLength hs)
isKeepAlive hs = isPersist && (isChunked' || hasLength hs)
hasLength hs = isJust $ lookup "content-length" hs
sendHeader = connSendMany conn . L.toChunks . toLazyByteString
sendResponse' :: Response -> ResourceT IO Bool
sendResponse' (ResponseFile s hs fp mpart) = do
eres <-
case (readInt `fmap` lookup "content-length" hs, mpart) of
(Just cl, _) -> return $ Right (hs, cl)
(Nothing, Nothing) -> liftIO $ try $ do
cl <- P.fileSize `fmap` P.getFileStatus fp
return $ addClToHeaders cl
(Nothing, Just part) -> do
let cl = filePartByteCount part
return $ Right $ addClToHeaders cl
case eres of
Left (_ :: SomeException) -> sendResponse' $ responseLBS
H.status404
[("Content-Type", "text/plain")]
"File not found"
Right (lengthyHeaders, cl) -> liftIO $ do
let headers' = headers version s lengthyHeaders
sendHeader $ headers' False
T.tickle th
if hasBody s req then do
case mpart of
Nothing -> connSendFile conn fp 0 cl (T.tickle th)
Just part -> connSendFile conn fp (filePartOffset part) (filePartByteCount part) (T.tickle th)
T.tickle th
return isPersist
else
return isPersist
where
addClToHeaders cl = (("Content-Length", B.pack $ show cl):hs, fromIntegral cl)
sendResponse' (ResponseBuilder s hs b)
| hasBody s req = liftIO $ do
toByteStringIO (\bs -> do
connSendAll conn bs
T.tickle th) body
return (isKeepAlive hs)
| otherwise = liftIO $ do
sendHeader $ headers' False
T.tickle th
return isPersist
where
headers' = headers version s hs
needsChunked' = needsChunked hs
body = if needsChunked'
then headers' needsChunked'
`mappend` chunkedTransferEncoding b
`mappend` chunkedTransferTerminator
else headers' False `mappend` b
sendResponse' (ResponseSource s hs bodyFlush)
| hasBody s req = do
let src = CL.sourceList [headers' needsChunked'] `mappend`
(if needsChunked' then body C.$= chunk else body)
src C.$$ builderToByteString C.=$ connSink conn th
return $ isKeepAlive hs
| otherwise = liftIO $ do
sendHeader $ headers' False
T.tickle th
return isPersist
where
body = fmap2 (\x -> case x of
C.Flush -> flush
C.Chunk builder -> builder) bodyFlush
headers' = headers version s hs
-- FIXME perhaps alloca a buffer per thread and reuse that in all
-- functions below. Should lessen greatly the GC burden (I hope)
needsChunked' = needsChunked hs
chunk :: C.Conduit Builder (ResourceT IO) Builder
chunk = C.NeedInput push close
push x = C.HaveOutput chunk (return ()) (chunkedTransferEncoding x)
close = C.HaveOutput (C.Done Nothing ()) (return ()) chunkedTransferTerminator
fmap2 :: Functor m => (o1 -> o2) -> C.Pipe i o1 m r -> C.Pipe i o2 m r
fmap2 f (C.HaveOutput p c o) = C.HaveOutput (fmap2 f p) c (f o)
fmap2 f (C.NeedInput p c) = C.NeedInput (fmap2 f . p) (fmap2 f c)
fmap2 f (C.PipeM mp c) = C.PipeM (fmap (fmap2 f) mp) c
fmap2 _ (C.Done i x) = C.Done i x
parseHeaderNoAttr :: ByteString -> H.Header
parseHeaderNoAttr s =
let (k, rest) = S.breakByte 58 s -- ':'
restLen = S.length rest
-- FIXME check for colon without following space?
rest' = if restLen > 1 && SU.unsafeTake 2 rest == ": "
then SU.unsafeDrop 2 rest
else rest
in (CI.mk k, rest')
connSource :: Connection -> T.Handle -> C.Source (ResourceT IO) ByteString
connSource Connection { connRecv = recv } th =
src
where
src = C.PipeM (do
bs <- liftIO recv
if S.null bs
then return $ C.Done Nothing ()
else do
when (S.length bs >= 2048) $ liftIO $ T.tickle th
return (C.HaveOutput src (return ()) bs))
(return ())
-- | Use 'connSendAll' to send this data while respecting timeout rules.
connSink :: Connection -> T.Handle -> C.Sink B.ByteString (ResourceT IO) ()
connSink Connection { connSendAll = send } th =
sink
where
sink = C.NeedInput push close
close = liftIO (T.resume th)
push x = C.PipeM (liftIO $ do
T.resume th
send x
T.pause th
return sink) (liftIO $ T.resume th)
-- We pause timeouts before passing control back to user code. This ensures
-- that a timeout will only ever be executed when Warp is in control. We
-- also make sure to resume the timeout after the completion of user code
-- so that we can kill idle connections.
------ The functions below are not warp-specific and could be split out into a
--separate package.
-- | Various Warp server settings. This is purposely kept as an abstract data
-- type so that new settings can be added without breaking backwards
-- compatibility. In order to create a 'Settings' value, use 'defaultSettings'
-- and record syntax to modify individual records. For example:
--
-- > defaultSettings { settingsTimeout = 20 }
data Settings = Settings
{ settingsPort :: Int -- ^ Port to listen on. Default value: 3000
, settingsHost :: HostPreference -- ^ Default value: HostIPv4
, settingsOnException :: SomeException -> IO () -- ^ What to do with exceptions thrown by either the application or server. Default: ignore server-generated exceptions (see 'InvalidRequest') and print application-generated applications to stderr.
, settingsTimeout :: Int -- ^ Timeout value in seconds. Default value: 30
, settingsIntercept :: Request -> Maybe (C.Source (ResourceT IO) S.ByteString -> Connection -> ResourceT IO ())
, settingsManager :: Maybe Manager -- ^ Use an existing timeout manager instead of spawning a new one. If used, 'settingsTimeout' is ignored. Default is 'Nothing'
}
-- | The default settings for the Warp server. See the individual settings for
-- the default value.
defaultSettings :: Settings
defaultSettings = Settings
{ settingsPort = 3000
, settingsHost = HostIPv4
, settingsOnException = \e ->
case fromException e of
Just x -> go x
Nothing ->
when (go' $ fromException e) $
hPrint stderr e
, settingsTimeout = 30
, settingsIntercept = const Nothing
, settingsManager = Nothing
}
where
go :: InvalidRequest -> IO ()
go _ = return ()
go' (Just ThreadKilled) = False
go' _ = True
type BSEndo = ByteString -> ByteString
type BSEndoList = [ByteString] -> [ByteString]
data THStatus = THStatus
{-# UNPACK #-} !Int -- running total byte count
BSEndoList -- previously parsed lines
BSEndo -- bytestrings to be prepended
takeHeaders :: C.Sink ByteString (ResourceT IO) [ByteString]
takeHeaders =
C.NeedInput (push (THStatus 0 id id)) close
where
close = throwIO IncompleteHeaders
push (THStatus len lines prepend) bs
-- Too many bytes
| len > maxTotalHeaderLength = throwIO OverLargeHeader
| otherwise =
case mnl of
-- No newline find in this chunk. Add it to the prepend,
-- update the length, and continue processing.
Nothing ->
let len' = len + bsLen
prepend' = prepend . S.append bs
status = THStatus len' lines prepend'
in C.NeedInput (push status) close
-- Found a newline at position end.
Just end ->
let start = end + 1 -- start of next chunk
line
-- There were some bytes before the newline, get them
| end > 0 = prepend $ SU.unsafeTake (checkCR bs end) bs
-- No bytes before the newline
| otherwise = prepend S.empty
in if S.null line
-- no more headers
then
let lines' = lines []
-- leftover
rest = if start < bsLen
then Just (SU.unsafeDrop start bs)
else Nothing
in C.Done rest lines'
-- more headers
else
let len' = len + start
lines' = lines . (line:)
status = THStatus len' lines' id
in if start < bsLen
-- more bytes in this chunk, push again
then let bs' = SU.unsafeDrop start bs
in push status bs'
-- no more bytes in this chunk, ask for more
else C.NeedInput (push status) close
where
bsLen = S.length bs
mnl = S.elemIndex 10 bs
{-# INLINE takeHeaders #-}
checkCR :: ByteString -> Int -> Int
checkCR bs pos =
let !p = pos - 1
in if '\r' == B.index bs p
then p
else pos
{-# INLINE checkCR #-}
readInt :: Integral a => ByteString -> a
readInt bs = fromIntegral $ readInt64 bs
{-# INLINE readInt #-}
-- | Call the inner function with a timeout manager.
withManager :: Int -- ^ timeout in microseconds
-> (Manager -> IO a)
-> IO a
withManager timeout f = do
-- FIXME when stopManager is available, use it
man <- T.initialize timeout
f man
serverHeader :: H.RequestHeaders -> H.RequestHeaders
serverHeader hdrs = case lookup key hdrs of
Nothing -> server : hdrs
Just _ -> hdrs
where
key = "Server"
ver = B.pack $ "Warp/" ++ warpVersion
server = (key, ver)