@@ -1,85 +1,138 @@
1+{-# LANGUAGE BangPatterns #-}
12{-# LANGUAGE CPP #-}
23{-# LANGUAGE OverloadedStrings #-}
4+{-# LANGUAGE PackageImports #-}
5+{-# LANGUAGE PatternGuards #-}
6+{-# LANGUAGE RecordWildCards #-}
37{-# LANGUAGE ScopedTypeVariables #-}
48{-# LANGUAGE TupleSections #-}
9+{-# LANGUAGE ViewPatterns #-}
510{-# OPTIONS_GHC -fno-warn-deprecations #-}
611
712module Network.Wai.Handler.Warp.Run where
813
14+import "iproute" Data.IP (toHostAddress, toHostAddress6)
915import Control.Arrow (first)
10−import Control.Concurrent (threadDelay, forkIOWithUnmask)
1116import qualified Control.Concurrent as Conc (yield)
1217import Control.Exception as E
13−import Control.Monad (when, unless, void)
14−import Data.ByteString (ByteString)
1518import qualified Data.ByteString as S
19+import Data.Char (chr)
1620import Data.IORef (IORef, newIORef, readIORef, writeIORef)
1721import Data.Streaming.Network (bindPortTCP)
18−import Network (sClose, Socket)
19−import Network.Socket (accept, withSocketsDo, SockAddr)
22+import Foreign.C.Error (Errno(..), eCONNABORTED)
23+import GHC.IO.Exception (IOException(..))
24+import qualified Network.HTTP2 as H2
25+import Network.Socket (Socket, close, accept, withSocketsDo, SockAddr(SockAddrInet, SockAddrInet6), setSocketOption, SocketOption(..))
26+#if MIN_VERSION_network(3,1,1)
27+import Network.Socket (gracefulClose)
28+#endif
2029import qualified Network.Socket.ByteString as Sock
2130import Network.Wai
31+import Network.Wai.Internal (ResponseReceived (ResponseReceived))
32+import System.Environment (lookupEnv)
33+import qualified System.TimeManager as T
34+import System.Timeout (timeout)
35+
2236import Network.Wai.Handler.Warp.Buffer
2337import Network.Wai.Handler.Warp.Counter
2438import qualified Network.Wai.Handler.Warp.Date as D
2539import qualified Network.Wai.Handler.Warp.FdCache as F
40+import qualified Network.Wai.Handler.Warp.FileInfoCache as I
41+import Network.Wai.Handler.Warp.HTTP2 (http2)
42+import Network.Wai.Handler.Warp.HTTP2.Types (isHTTP2)
2643import Network.Wai.Handler.Warp.Header
44+import Network.Wai.Handler.Warp.Imports hiding (readInt)
45+import Network.Wai.Handler.Warp.ReadInt
2746import Network.Wai.Handler.Warp.Recv
2847import Network.Wai.Handler.Warp.Request
2948import Network.Wai.Handler.Warp.Response
3049import Network.Wai.Handler.Warp.SendFile
3150import Network.Wai.Handler.Warp.Settings
32−import qualified Network.Wai.Handler.Warp.Timeout as T
3351import Network.Wai.Handler.Warp.Types
34−import Network.Wai.Internal (ResponseReceived (ResponseReceived))
35−import System.IO.Error (isFullErrorType, ioeGetErrorType)
52+
3653
3754#if WINDOWS
3855import Network.Wai.Handler.Warp.Windows
3956#else
40−import System.Posix.IO (FdOption(CloseOnExec), setFdOption)
4157import Network.Socket (fdSocket)
4258#endif
4359
44−-- | Default action value for 'Connection'.
45−socketConnection :: Socket -> IO Connection
46−socketConnection s = do
47− readBuf <- allocateBuffer bufferSize
60+-- | Creating 'Connection' for plain HTTP based on a given socket.
61+socketConnection :: Settings -> Socket -> IO Connection
62+#if MIN_VERSION_network(3,1,1)
63+socketConnection set s = do
64+#else
65+socketConnection _ s = do
66+#endif
67+ bufferPool <- newBufferPool
4868 writeBuf <- allocateBuffer bufferSize
69+ let sendall = Sock.sendAll s
70+ isH2 <- newIORef False -- HTTP/1.x
4971 return Connection {
5072 connSendMany = Sock.sendMany s
51− , connSendAll = Sock.sendAll s
52− , connSendFile = defaultSendFile s
53− , connClose = sClose s >> freeBuffer readBuf >> freeBuffer writeBuf
54− , connRecv = receive s readBuf bufferSize
55− , connReadBuffer = readBuf
73+ , connSendAll = sendall
74+ , connSendFile = sendFile s writeBuf bufferSize sendall
75+#if MIN_VERSION_network(3,1,1)
76+ , connClose = do
77+ h2 <- readIORef isH2
78+ let tm = if h2 then settingsGracefulCloseTimeout2 set
79+ else settingsGracefulCloseTimeout1 set
80+ if tm == 0 then
81+ close s
82+ else
83+ gracefulClose s tm `E.catch` \(E.SomeException _) -> return ()
84+#else
85+ , connClose = close s
86+#endif
87+ , connFree = freeBuffer writeBuf
88+ , connRecv = receive s bufferPool
89+ , connRecvBuf = receiveBuf s
5690 , connWriteBuffer = writeBuf
5791 , connBufferSize = bufferSize
58− , connSendFileOverride = Override s
92+ , connHTTP2 = isH2
5993 }
6094
61−#if __GLASGOW_HASKELL__ < 702
62−allowInterrupt :: IO ()
63−allowInterrupt = unblock $ return ()
64−#endif
65−
66−-- | Run an 'Application' on the given port. This calls 'runSettings' with
67−-- 'defaultSettings'.
95+-- | Run an 'Application' on the given port.
96+-- This calls 'runSettings' with 'defaultSettings'.
6897run :: Port -> Application -> IO ()
6998run p = runSettings defaultSettings { settingsPort = p }
7099
100+-- | Run an 'Application' on the port present in the @PORT@
101+-- environment variable. Uses the 'Port' given when the variable is unset.
102+-- This calls 'runSettings' with 'defaultSettings'.
103+--
104+-- Since 3.0.9
105+runEnv :: Port -> Application -> IO ()
106+runEnv p app = do
107+ mp <- lookupEnv "PORT"
108+
109+ maybe (run p app) runReadPort mp
110+
111+ where
112+ runReadPort :: String -> IO ()
113+ runReadPort sp = case reads sp of
114+ ((p', _):_) -> run p' app
115+ _ -> fail $ "Invalid value in $PORT: " ++ sp
116+
71117-- | Run an 'Application' with the given 'Settings'.
118+-- This opens a listen socket on the port defined in 'Settings' and
119+-- calls 'runSettingsSocket'.
72120runSettings :: Settings -> Application -> IO ()
73121runSettings set app = withSocketsDo $
74122 bracket
75123 (bindPortTCP (settingsPort set) (settingsHost set))
76− sClose
124+ close
77125 (\socket -> do
78126 setSocketCloseOnExec socket
79127 runSettingsSocket set socket app)
80128
81−-- | Same as 'runSettings', but uses a user-supplied socket instead of opening
82−-- one. This allows the user to provide, for example, Unix named socket, which
129+-- | This installs a shutdown handler for the given socket and
130+-- calls 'runSettingsConnection' with the default connection setup action
131+-- which handles plain (non-cipher) HTTP.
132+-- When the listen socket in the second argument is closed, all live
133+-- connections are gracefully shut down.
134+--
135+-- The supplied socket can be a Unix named socket, which
83136-- can be used when reverse HTTP proxying into your application.
84137--
85138-- Note that the 'settingsPort' will still be passed to 'Application's via the
@@ -96,15 +149,20 @@ runSettingsSocket set socket app = do
96149 (s, sa) <- accept socket
97150#endif
98151 setSocketCloseOnExec s
99− conn <- socketConnection s
152+ -- NoDelay causes an error for AF_UNIX.
153+ setSocketOption s NoDelay 1 `E.catch` \(E.SomeException _) -> return ()
154+ conn <- socketConnection set s
100155 return (conn, sa)
101156
102− closeListenSocket = sClose socket
157+ closeListenSocket = close socket
103158
104−-- | Allows you to provide a function which will return a 'Connection'. In
105−-- cases where creating the @Connection@ can be expensive, this allows the
106−-- expensive computations to be performed in a separate thread instead of the
107−-- main server loop.
159+-- | The connection setup action would be expensive. A good example
160+-- is initialization of TLS.
161+-- So, this converts the connection setup action to the connection maker
162+-- which will be executed after forking a new worker thread.
163+-- Then this calls 'runSettingsConnectionMaker' with the connection maker.
164+-- This allows the expensive computations to be performed
165+-- in a separate worker thread instead of the main server loop.
108166--
109167-- Since 1.3.5
110168runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()
@@ -114,41 +172,46 @@ runSettingsConnection set getConn app = runSettingsConnectionMaker set getConnMa
114172 (conn, sa) <- getConn
115173 return (return conn, sa)
116174
175+-- | This modifies the connection maker so that it returns 'TCP' for 'Transport'
176+-- (i.e. plain HTTP) then calls 'runSettingsConnectionMakerSecure'.
117177runSettingsConnectionMaker :: Settings -> IO (IO Connection, SockAddr) -> Application -> IO ()
118178runSettingsConnectionMaker x y =
119− runSettingsConnectionMakerSecure x (go y)
179+ runSettingsConnectionMakerSecure x (toTCP <$> y)
120180 where
121− go = fmap (first (fmap (, False)))
181+ toTCP = first ((, TCP) <$>)
122182
123183----------------------------------------------------------------
124184
125−-- | Allows you to provide a function which will return a function
126−-- which will return 'Connection'.
185+-- | The core run function which takes 'Settings',
186+-- a connection maker and 'Application'.
187+-- The connection maker can return a connection of either plain HTTP
188+-- or HTTP over TLS.
127189--
128190-- Since 2.1.4
129−runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Bool), SockAddr) -> Application -> IO ()
191+runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Transport), SockAddr) -> Application -> IO ()
130192runSettingsConnectionMakerSecure set getConnMaker app = do
131193 settingsBeforeMainLoop set
132194 counter <- newCounter
133−
134− D.withDateCache $ \dc ->
135− F.withFdCache fdCacheDurationInSeconds $ \fc ->
136− withTimeoutManager $ \tm ->
137− acceptConnection set getConnMaker app dc fc tm counter
195+ withII $ acceptConnection set getConnMaker app counter
138196 where
139− fdCacheDurationInSeconds = settingsFdCacheDuration set * 1000000
197+ withII action =
198+ withTimeoutManager $ \tm ->
199+ D.withDateCache $ \dc ->
200+ F.withFdCache fdCacheDurationInSeconds $ \fdc ->
201+ I.withFileInfoCache fdFileInfoDurationInSeconds $ \fic -> do
202+ let ii = InternalInfo tm dc fdc fic
203+ action ii
204+
205+ !fdCacheDurationInSeconds = settingsFdCacheDuration set * 1000000
206+ !fdFileInfoDurationInSeconds = settingsFileInfoCacheDuration set * 1000000
207+ !timeoutInSeconds = settingsTimeout set * 1000000
140208 withTimeoutManager f = case settingsManager set of
141209 Just tm -> f tm
142210 Nothing -> bracket
143− (T.initialize $ settingsTimeout set * 1000000)
211+ (T.initialize timeoutInSeconds)
144212 T.stopManager
145213 f
146214
147−onE :: Settings -> Maybe Request -> SomeException -> IO ()
148−onE set mreq e = case fromException e of
149− Just (NotEnoughLines []) -> return ()
150− _ -> settingsOnException set mreq e
151−
152215-- Note that there is a thorough discussion of the exception safety of the
153216-- following code at: https://github.com/yesodweb/wai/issues/146
154217--
@@ -163,19 +226,22 @@ onE set mreq e = case fromException e of
163226--
164227-- Our approach is explained in the comments below.
165228acceptConnection :: Settings
166− -> IO (IO (Connection, Bool), SockAddr)
229+ -> IO (IO (Connection, Transport), SockAddr)
167230 -> Application
168− -> D.DateCache
169− -> Maybe F.MutableFdCache
170− -> T.Manager
171231 -> Counter
232+ -> InternalInfo
172233 -> IO ()
173−acceptConnection set getConnMaker app dc fc tm counter = do
234+acceptConnection set getConnMaker app counter ii = do
174235 -- First mask all exceptions in acceptLoop. This is necessary to
175236 -- ensure that no async exception is throw between the call to
176237 -- acceptNewConnection and the registering of connClose.
177− void $ mask_ $ acceptLoop
178− gracefulShutdown counter
238+ --
239+ -- acceptLoop can be broken by closing the listing socket.
240+ void $ mask_ acceptLoop
241+ -- In some cases, we want to stop Warp here without graceful shutdown.
242+ -- So, async exceptions are allowed here.
243+ -- That's why `finally` is not used.
244+ gracefulShutdown set counter
179245 where
180246 acceptLoop = do
181247 -- Allow async exceptions before receiving the next connection maker.
@@ -192,104 +258,195 @@ acceptConnection set getConnMaker app dc fc tm counter = do
192258 case mx of
193259 Nothing -> return ()
194260 Just (mkConn, addr) -> do
195− fork set mkConn addr app dc fc tm counter
261+ fork set mkConn addr app counter ii
196262 acceptLoop
197263
198264 acceptNewConnection = do
199265 ex <- try getConnMaker
200266 case ex of
201267 Right x -> return $ Just x
202− Left e -> do
203− onE set Nothing $ toException e
204− if isFullErrorType (ioeGetErrorType e) then do
205− -- "resource exhausted (Too many open files)" may
206− -- happen by accept(). Wait a second hoping that
207− -- resource will be available.
208− threadDelay 1000000
209− acceptNewConnection
210− else
211− -- Assuming the listen socket is closed.
212− return Nothing
268+ Left e -> do
269+ let eConnAborted = getErrno eCONNABORTED
270+ getErrno (Errno cInt) = cInt
271+ if ioe_errno e == Just eConnAborted
272+ then acceptNewConnection
273+ else do
274+ settingsOnException set Nothing $ toException e
275+ return Nothing
213276
214277-- Fork a new worker thread for this connection maker, and ask for a
215278-- function to unmask (i.e., allow async exceptions to be thrown).
216279fork :: Settings
217− -> IO (Connection, Bool)
280+ -> IO (Connection, Transport)
218281 -> SockAddr
219282 -> Application
220− -> D.DateCache
221− -> Maybe F.MutableFdCache
222− -> T.Manager
223283 -> Counter
284+ -> InternalInfo
224285 -> IO ()
225−fork set mkConn addr app dc fc tm counter = void $ forkIOWithUnmask $ \unmask ->
226− -- Run the connection maker to get a new connection, and ensure
227− -- that the connection is closed. If the mkConn call throws an
228− -- exception, we will leak the connection. If the mkConn call is
229− -- vulnerable to attacks (e.g., Slowloris), we do nothing to
230− -- protect the server. It is therefore vital that mkConn is well
231− -- vetted.
232− --
233− -- We grab the connection before registering timeouts since the
234− -- timeouts will be useless during connection creation, due to the
235− -- fact that async exceptions are still masked.
236− bracket mkConn closeConn $ \(conn0, isSecure') ->
286+fork set mkConn addr app counter ii = settingsFork set $ \unmask ->
287+ -- Call the user-supplied on exception code if any
288+ -- exceptions are thrown.
289+ handle (settingsOnException set Nothing) $
290+ -- Run the connection maker to get a new connection, and ensure
291+ -- that the connection is closed. If the mkConn call throws an
292+ -- exception, we will leak the connection. If the mkConn call is
293+ -- vulnerable to attacks (e.g., Slowloris), we do nothing to
294+ -- protect the server. It is therefore vital that mkConn is well
295+ -- vetted.
296+ --
297+ -- We grab the connection before registering timeouts since the
298+ -- timeouts will be useless during connection creation, due to the
299+ -- fact that async exceptions are still masked.
300+ bracket mkConn cleanUp (serve unmask)
301+ where
302+ cleanUp (conn, _) = connClose conn `finally` connFree conn
237303
238304 -- We need to register a timeout handler for this thread, and
239305 -- cancel that handler as soon as we exit.
240− bracket (T.registerKillThread tm) T.cancel $ \th ->
241−
242− let ii = InternalInfo th fc dc
243− conn = setSendFile conn0 fc
244− -- We now have fully registered a connection close handler
245− -- in the case of all exceptions, so it is safe to one
246− -- again allow async exceptions.
247− in unmask .
248− -- Call the user-supplied on exception code if any
249− -- exceptions are thrown.
250− handle (onE set Nothing) .
251−
252− -- Call the user-supplied code for connection open and close events
253− bracket (onOpen addr) (onClose addr) $ \goingon ->
254−
255− -- Actually serve this connection.
256− -- onnClose above ensures the termination of the connection.
257− when goingon $ serveConnection conn ii addr isSecure' set app
258− where
259− closeConn (conn, _isSecure) = connClose conn
306+ serve unmask (conn, transport) = bracket register cancel $ \th -> do
307+ -- We now have fully registered a connection close handler in
308+ -- the case of all exceptions, so it is safe to once again
309+ -- allow async exceptions.
310+ unmask .
311+ -- Call the user-supplied code for connection open and
312+ -- close events
313+ bracket (onOpen addr) (onClose addr) $ \goingon ->
314+ -- Actually serve this connection. bracket with closeConn
315+ -- above ensures the connection is closed.
316+ when goingon $ serveConnection conn ii th addr transport set app
317+ where
318+ register = T.registerKillThread (timeoutManager ii) (connClose conn)
319+ cancel = T.cancel
260320
261321 onOpen adr = increase counter >> settingsOnOpen set adr
262322 onClose adr _ = decrease counter >> settingsOnClose set adr
263323
264324serveConnection :: Connection
265325 -> InternalInfo
326+ -> T.Handle
266327 -> SockAddr
267− -> Bool -- ^ is secure?
328+ -> Transport
268329 -> Settings
269330 -> Application
270331 -> IO ()
271−serveConnection conn ii addr isSecure' settings app = do
332+serveConnection conn ii th origAddr transport settings app = do
333+ -- fixme: Upgrading to HTTP/2 should be supported.
334+ (h2,bs) <- if isHTTP2 transport then
335+ return (True, "")
336+ else do
337+ bs0 <- connRecv conn
338+ if S.length bs0 >= 4 && "PRI " `S.isPrefixOf` bs0 then
339+ return (True, bs0)
340+ else
341+ return (False, bs0)
272342 istatus <- newIORef False
273− src <- mkSource (connSource conn th istatus)
274− recvSendLoop istatus src `E.catch` \e -> do
275− sendErrorResponse istatus e
276− throwIO (e :: SomeException)
343+ if settingsHTTP2Enabled settings && h2 then do
344+ rawRecvN <- makeReceiveN bs (connRecv conn) (connRecvBuf conn)
345+ -- This thread becomes the sender in http2 library.
346+ -- In the case of event source, one request comes and one
347+ -- worker gets busy. But it is likely that the receiver does
348+ -- not receive any data at all while the sender is sending
349+ -- output data from the worker. It's not good enough to tickle
350+ -- the time handler in the receiver only. So, we should tickle
351+ -- the time handler in both the receiver and the sender.
352+ let recvN = wrappedRecvN th istatus (settingsSlowlorisSize settings) rawRecvN
353+ sendBS x = connSendAll conn x >> T.tickle th
354+ -- fixme: origAddr
355+ checkTLS
356+ setConnHTTP2 conn True
357+ http2 conn transport ii origAddr settings recvN sendBS app
358+ else do
359+ src <- mkSource (wrappedRecv conn th istatus (settingsSlowlorisSize settings))
360+ writeIORef istatus True
361+ leftoverSource src bs
362+ addr <- getProxyProtocolAddr src
363+ http1 True addr istatus src `E.catch` \e ->
364+ case () of
365+ ()
366+ -- See comment below referencing
367+ -- https://github.com/yesodweb/wai/issues/618
368+ | Just NoKeepAliveRequest <- fromException e -> return ()
369+ -- No valid request
370+ | Just (BadFirstLine _) <- fromException e -> return ()
371+ | otherwise -> do
372+ _ <- sendErrorResponse (dummyreq addr) istatus e
373+ throwIO e
277374
278375 where
279− th = threadHandle ii
280−
281− sendErrorResponse istatus e = do
376+ getProxyProtocolAddr src =
377+ case settingsProxyProtocol settings of
378+ ProxyProtocolNone ->
379+ return origAddr
380+ ProxyProtocolRequired -> do
381+ seg <- readSource src
382+ parseProxyProtocolHeader src seg
383+ ProxyProtocolOptional -> do
384+ seg <- readSource src
385+ if S.isPrefixOf "PROXY " seg
386+ then parseProxyProtocolHeader src seg
387+ else do leftoverSource src seg
388+ return origAddr
389+
390+ parseProxyProtocolHeader src seg = do
391+ let (header,seg') = S.break (== 0x0d) seg -- 0x0d == CR
392+ maybeAddr = case S.split 0x20 header of -- 0x20 == space
393+ ["PROXY","TCP4",clientAddr,_,clientPort,_] ->
394+ case [x | (x, t) <- reads (decodeAscii clientAddr), null t] of
395+ [a] -> Just (SockAddrInet (readInt clientPort)
396+ (toHostAddress a))
397+ _ -> Nothing
398+ ["PROXY","TCP6",clientAddr,_,clientPort,_] ->
399+ case [x | (x, t) <- reads (decodeAscii clientAddr), null t] of
400+ [a] -> Just (SockAddrInet6 (readInt clientPort)
401+ 0
402+ (toHostAddress6 a)
403+ 0)
404+ _ -> Nothing
405+ ("PROXY":"UNKNOWN":_) ->
406+ Just origAddr
407+ _ ->
408+ Nothing
409+ case maybeAddr of
410+ Nothing -> throwIO (BadProxyHeader (decodeAscii header))
411+ Just a -> do leftoverSource src (S.drop 2 seg') -- drop CRLF
412+ return a
413+
414+ decodeAscii = map (chr . fromEnum) . S.unpack
415+
416+ shouldSendErrorResponse se
417+ | Just ConnectionClosedByPeer <- fromException se = False
418+ | otherwise = True
419+
420+ sendErrorResponse req istatus e = do
282421 status <- readIORef istatus
283− when status $ void $
284− sendResponse conn ii dummyreq defaultIndexRequestHeader (return S.empty) (errorResponse e)
422+ if shouldSendErrorResponse e && status
423+ then do
424+ sendResponse settings conn ii th req defaultIndexRequestHeader (return S.empty) (errorResponse e)
425+ else return False
285426
286− dummyreq = defaultRequest { remoteHost = addr }
427+ dummyreq addr = defaultRequest { remoteHost = addr }
287428
288429 errorResponse e = settingsOnExceptionResponse settings e
289430
290− recvSendLoop istatus fromClient = do
291− (req', idxhdr) <- recvRequest settings conn ii addr fromClient
292− let req = req' { isSecure = isSecure' }
431+ http1 firstRequest addr istatus src = do
432+ (req, mremainingRef, idxhdr, nextBodyFlush) <- recvRequest firstRequest settings conn ii th addr src transport
433+ keepAlive <- processRequest istatus src req mremainingRef idxhdr nextBodyFlush
434+ `E.catch` \e -> do
435+ settingsOnException settings (Just req) e
436+ -- Don't throw the error again to prevent calling settingsOnException twice.
437+ return False
438+
439+ -- When doing a keep-alive connection, the other side may just
440+ -- close the connection. We don't want to treat that as an
441+ -- exceptional situation, so we pass in False to http1 (which
442+ -- in turn passes in False to recvRequest), indicating that
443+ -- this is not the first request. If, when trying to read the
444+ -- request headers, no data is available, recvRequest will
445+ -- throw a NoKeepAliveRequest exception, which we catch here
446+ -- and ignore. See: https://github.com/yesodweb/wai/issues/618
447+ when keepAlive $ http1 False addr istatus src
448+
449+ processRequest istatus src req mremainingRef idxhdr nextBodyFlush = do
293450 -- Let the application run for as long as it wants
294451 T.pause th
295452
@@ -297,61 +454,146 @@ serveConnection conn ii addr isSecure' settings app = do
297454 -- creating the request, we need to make sure that we don't get
298455 -- an async exception before calling the ResponseSource.
299456 keepAliveRef <- newIORef $ error "keepAliveRef not filled"
300− _ <- app req $ \res -> do
457+ r <- E.try $ app req $ \res -> do
301458 T.resume th
302459 -- FIXME consider forcing evaluation of the res here to
303460 -- send more meaningful error messages to the user.
304461 -- However, it may affect performance.
305462 writeIORef istatus False
306− keepAlive <- sendResponse conn ii req idxhdr (readSource fromClient) res
463+ keepAlive <- sendResponse settings conn ii th req idxhdr (readSource src) res
307464 writeIORef keepAliveRef keepAlive
308465 return ResponseReceived
466+ case r of
467+ Right ResponseReceived -> return ()
468+ Left e@(SomeException _)
469+ | Just (ExceptionInsideResponseBody e') <- fromException e -> throwIO e'
470+ | otherwise -> do
471+ keepAlive <- sendErrorResponse req istatus e
472+ settingsOnException settings (Just req) e
473+ writeIORef keepAliveRef keepAlive
474+
309475 keepAlive <- readIORef keepAliveRef
310476
311477 -- We just send a Response and it takes a time to
312478 -- receive a Request again. If we immediately call recv,
313− -- it is likely to fail and the IO manager works.
314− -- It is very costy. So, we yield to another Haskell
315− -- thread hoping that the next Request will arraive
479+ -- it is likely to fail and cause the IO manager to do some work.
480+ -- It is very costly, so we yield to another Haskell
481+ -- thread hoping that the next Request will arrive
316482 -- when this Haskell thread will be re-scheduled.
317483 -- This improves performance at least when
318484 -- the number of cores is small.
319485 Conc.yield
320486
321− when keepAlive $ do
322− -- flush the rest of the request body
323− flushBody $ requestBody req
324− T.resume th
325− recvSendLoop istatus fromClient
487+ if keepAlive
488+ then
489+ -- If there is an unknown or large amount of data to still be read
490+ -- from the request body, simple drop this connection instead of
491+ -- reading it all in to satisfy a keep-alive request.
492+ case settingsMaximumBodyFlush settings of
493+ Nothing -> do
494+ flushEntireBody nextBodyFlush
495+ T.resume th
496+ return True
497+ Just maxToRead -> do
498+ let tryKeepAlive = do
499+ -- flush the rest of the request body
500+ isComplete <- flushBody nextBodyFlush maxToRead
501+ if isComplete then do
502+ T.resume th
503+ return True
504+ else
505+ return False
506+ case mremainingRef of
507+ Just ref -> do
508+ remaining <- readIORef ref
509+ if remaining <= maxToRead then
510+ tryKeepAlive
511+ else
512+ return False
513+ Nothing -> tryKeepAlive
514+ else
515+ return False
516+
517+ checkTLS = case transport of
518+ TCP -> return () -- direct
519+ tls -> unless (tls12orLater tls) $ goaway conn H2.InadequateSecurity "Weak TLS"
520+ tls12orLater tls = tlsMajorVersion tls == 3 && tlsMinorVersion tls >= 3
521+
522+-- connClose must not be called here since Run:fork calls it
523+goaway :: Connection -> H2.ErrorCodeId -> ByteString -> IO ()
524+goaway Connection{..} etype debugmsg = connSendAll bytestream
525+ where
526+ einfo = H2.encodeInfo id 0
527+ frame = H2.GoAwayFrame 0 etype debugmsg
528+ bytestream = H2.encodeFrame einfo frame
326529
327−flushBody :: IO ByteString -> IO ()
328−flushBody src =
530+flushEntireBody :: IO ByteString -> IO ()
531+flushEntireBody src =
329532 loop
330533 where
331534 loop = do
332535 bs <- src
333536 unless (S.null bs) loop
334537
335−connSource :: Connection -> T.Handle -> IORef Bool -> IO ByteString
336−connSource Connection { connRecv = recv } th istatus = do
538+flushBody :: IO ByteString -- ^ get next chunk
539+ -> Int -- ^ maximum to flush
540+ -> IO Bool -- ^ True == flushed the entire body, False == we didn't
541+flushBody src =
542+ loop
543+ where
544+ loop toRead = do
545+ bs <- src
546+ let toRead' = toRead - S.length bs
547+ case () of
548+ ()
549+ | S.null bs -> return True
550+ | toRead' >= 0 -> loop toRead'
551+ | otherwise -> return False
552+
553+wrappedRecv :: Connection -> T.Handle -> IORef Bool -> Int -> IO ByteString
554+wrappedRecv Connection { connRecv = recv } th istatus slowlorisSize = do
337555 bs <- recv
338556 unless (S.null bs) $ do
339557 writeIORef istatus True
340− when (S.length bs >= 2048) $ T.tickle th
558+ when (S.length bs >= slowlorisSize) $ T.tickle th
559+ return bs
560+
561+wrappedRecvN :: T.Handle -> IORef Bool -> Int -> (BufSize -> IO ByteString) -> (BufSize -> IO ByteString)
562+wrappedRecvN th istatus slowlorisSize readN bufsize = do
563+ bs <- readN bufsize
564+ unless (S.null bs) $ do
565+ writeIORef istatus True
566+ -- TODO: think about the slowloris protection in HTTP2: current code
567+ -- might open a slow-loris attack vector. Rather than timing we should
568+ -- consider limiting the per-client connections assuming that in HTTP2
569+ -- we should allow only few connections per host (real-world
570+ -- deployments with large NATs may be trickier).
571+ when (S.length bs >= slowlorisSize || bufsize <= slowlorisSize) $ T.tickle th
341572 return bs
342573
574+-- | Set flag FileCloseOnExec flag on a socket (on Unix)
575+--
343576-- Copied from: https://github.com/mzero/plush/blob/master/src/Plush/Server/Warp.hs
577+--
578+-- @since 3.2.17
344579setSocketCloseOnExec :: Socket -> IO ()
345580#if WINDOWS
346581setSocketCloseOnExec _ = return ()
347582#else
348−setSocketCloseOnExec socket =
349− setFdOption (fromIntegral $ fdSocket socket) CloseOnExec True
583+setSocketCloseOnExec socket = do
584+#if MIN_VERSION_network(3,0,0)
585+ fd <- fdSocket socket
586+#else
587+ let fd = fdSocket socket
588+#endif
589+ F.setFileCloseOnExec $ fromIntegral fd
350590#endif
351591
352−gracefulShutdown :: Counter -> IO ()
353−gracefulShutdown counter = do
354− -- To avoid race condition, we just use threadDelay, not MVar.
355− threadDelay 10000000
356− noConnections <- isZero counter
357− unless noConnections $ gracefulShutdown counter
592+gracefulShutdown :: Settings -> Counter -> IO ()
593+gracefulShutdown set counter =
594+ case settingsGracefulShutdownTimeout set of
595+ Nothing ->
596+ waitForZero counter
597+ (Just seconds) ->
598+ void (timeout (seconds * microsPerSecond) (waitForZero counter))
599+ where microsPerSecond = 1000000