@@ -1,95 +1,142 @@
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)
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
1619import Data.Char (chr)
17−import Data.IP (toHostAddress, toHostAddress6)
1820import Data.IORef (IORef, newIORef, readIORef, writeIORef)
1921import Data.Streaming.Network (bindPortTCP)
20−import Network (sClose, Socket)
21−import Network.Socket (accept, withSocketsDo, SockAddr(SockAddrInet, SockAddrInet6))
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
2229import qualified Network.Socket.ByteString as Sock
2330import 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+
2436import Network.Wai.Handler.Warp.Buffer
2537import Network.Wai.Handler.Warp.Counter
2638import qualified Network.Wai.Handler.Warp.Date as D
2739import 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)
2843import Network.Wai.Handler.Warp.Header
44+import Network.Wai.Handler.Warp.Imports hiding (readInt)
2945import Network.Wai.Handler.Warp.ReadInt
3046import Network.Wai.Handler.Warp.Recv
3147import Network.Wai.Handler.Warp.Request
3248import Network.Wai.Handler.Warp.Response
3349import Network.Wai.Handler.Warp.SendFile
3450import Network.Wai.Handler.Warp.Settings
35−import qualified Network.Wai.Handler.Warp.Timeout as T
3651import Network.Wai.Handler.Warp.Types
37−import Network.Wai.Internal (ResponseReceived (ResponseReceived))
38−import System.IO.Error (isFullErrorType, ioeGetErrorType)
52+
3953
4054#if WINDOWS
4155import Network.Wai.Handler.Warp.Windows
4256#else
43−import System.Posix.IO (FdOption(CloseOnExec), setFdOption)
4457import Network.Socket (fdSocket)
4558#endif
4659
47−-- | Default action value for 'Connection'.
48−socketConnection :: Socket -> IO Connection
49−socketConnection s = do
50− 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
5168 writeBuf <- allocateBuffer bufferSize
69+ let sendall = Sock.sendAll s
70+ isH2 <- newIORef False -- HTTP/1.x
5271 return Connection {
5372 connSendMany = Sock.sendMany s
54− , connSendAll = Sock.sendAll s
55− , connSendFile = defaultSendFile s
56− , connClose = sClose s >> freeBuffer readBuf >> freeBuffer writeBuf
57− , connRecv = receive s readBuf bufferSize
58− , 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
5990 , connWriteBuffer = writeBuf
6091 , connBufferSize = bufferSize
61− , connSendFileOverride = Override s
92+ , connHTTP2 = isH2
6293 }
6394
64−#if __GLASGOW_HASKELL__ < 702
65−allowInterrupt :: IO ()
66−allowInterrupt = unblock $ return ()
67−#endif
68−
69−-- | Run an 'Application' on the given port. This calls 'runSettings' with
70−-- 'defaultSettings'.
95+-- | Run an 'Application' on the given port.
96+-- This calls 'runSettings' with 'defaultSettings'.
7197run :: Port -> Application -> IO ()
7298run p = runSettings defaultSettings { settingsPort = p }
7399
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+
74117-- | Run an 'Application' with the given 'Settings'.
118+-- This opens a listen socket on the port defined in 'Settings' and
119+-- calls 'runSettingsSocket'.
75120runSettings :: Settings -> Application -> IO ()
76121runSettings set app = withSocketsDo $
77122 bracket
78123 (bindPortTCP (settingsPort set) (settingsHost set))
79− sClose
124+ close
80125 (\socket -> do
81126 setSocketCloseOnExec socket
82127 runSettingsSocket set socket app)
83128
84−-- | Same as 'runSettings', but uses a user-supplied socket instead of opening
85−-- 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
86136-- can be used when reverse HTTP proxying into your application.
87137--
88138-- Note that the 'settingsPort' will still be passed to 'Application's via the
89139-- 'serverPort' record.
90−--
91−-- When the listen socket in the second argument is closed, all live
92−-- connections are gracefully shut down.
93140runSettingsSocket :: Settings -> Socket -> Application -> IO ()
94141runSettingsSocket set socket app = do
95142 settingsInstallShutdownHandler set closeListenSocket
@@ -102,15 +149,20 @@ runSettingsSocket set socket app = do
102149 (s, sa) <- accept socket
103150#endif
104151 setSocketCloseOnExec s
105− 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
106155 return (conn, sa)
107156
108− closeListenSocket = sClose socket
157+ closeListenSocket = close socket
109158
110−-- | Allows you to provide a function which will return a 'Connection'. In
111−-- cases where creating the @Connection@ can be expensive, this allows the
112−-- expensive computations to be performed in a separate thread instead of the
113−-- 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.
114166--
115167-- Since 1.3.5
116168runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()
@@ -120,41 +172,46 @@ runSettingsConnection set getConn app = runSettingsConnectionMaker set getConnMa
120172 (conn, sa) <- getConn
121173 return (return conn, sa)
122174
175+-- | This modifies the connection maker so that it returns 'TCP' for 'Transport'
176+-- (i.e. plain HTTP) then calls 'runSettingsConnectionMakerSecure'.
123177runSettingsConnectionMaker :: Settings -> IO (IO Connection, SockAddr) -> Application -> IO ()
124178runSettingsConnectionMaker x y =
125− runSettingsConnectionMakerSecure x (go y)
179+ runSettingsConnectionMakerSecure x (toTCP <$> y)
126180 where
127− go = fmap (first (fmap (, False)))
181+ toTCP = first ((, TCP) <$>)
128182
129183----------------------------------------------------------------
130184
131−-- | Allows you to provide a function which will return a function
132−-- 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.
133189--
134190-- Since 2.1.4
135−runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Bool), SockAddr) -> Application -> IO ()
191+runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Transport), SockAddr) -> Application -> IO ()
136192runSettingsConnectionMakerSecure set getConnMaker app = do
137193 settingsBeforeMainLoop set
138194 counter <- newCounter
139−
140− D.withDateCache $ \dc ->
141− F.withFdCache fdCacheDurationInSeconds $ \fc ->
142− withTimeoutManager $ \tm ->
143− acceptConnection set getConnMaker app dc fc tm counter
195+ withII $ acceptConnection set getConnMaker app counter
144196 where
145− 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
146208 withTimeoutManager f = case settingsManager set of
147209 Just tm -> f tm
148210 Nothing -> bracket
149− (T.initialize $ settingsTimeout set * 1000000)
211+ (T.initialize timeoutInSeconds)
150212 T.stopManager
151213 f
152214
153−onE :: Settings -> Maybe Request -> SomeException -> IO ()
154−onE set mreq e = case fromException e of
155− Just (NotEnoughLines []) -> return ()
156− _ -> settingsOnException set mreq e
157−
158215-- Note that there is a thorough discussion of the exception safety of the
159216-- following code at: https://github.com/yesodweb/wai/issues/146
160217--
@@ -169,19 +226,22 @@ onE set mreq e = case fromException e of
169226--
170227-- Our approach is explained in the comments below.
171228acceptConnection :: Settings
172− -> IO (IO (Connection, Bool), SockAddr)
229+ -> IO (IO (Connection, Transport), SockAddr)
173230 -> Application
174− -> D.DateCache
175− -> Maybe F.MutableFdCache
176− -> T.Manager
177231 -> Counter
232+ -> InternalInfo
178233 -> IO ()
179−acceptConnection set getConnMaker app dc fc tm counter = do
234+acceptConnection set getConnMaker app counter ii = do
180235 -- First mask all exceptions in acceptLoop. This is necessary to
181236 -- ensure that no async exception is throw between the call to
182237 -- acceptNewConnection and the registering of connClose.
183− void $ mask_ $ acceptLoop
184− 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
185245 where
186246 acceptLoop = do
187247 -- Allow async exceptions before receiving the next connection maker.
@@ -198,89 +258,119 @@ acceptConnection set getConnMaker app dc fc tm counter = do
198258 case mx of
199259 Nothing -> return ()
200260 Just (mkConn, addr) -> do
201− fork set mkConn addr app dc fc tm counter
261+ fork set mkConn addr app counter ii
202262 acceptLoop
203263
204264 acceptNewConnection = do
205265 ex <- try getConnMaker
206266 case ex of
207267 Right x -> return $ Just x
208− Left e -> do
209− onE set Nothing $ toException e
210− if isFullErrorType (ioeGetErrorType e) then do
211− -- "resource exhausted (Too many open files)" may
212− -- happen by accept(). Wait a second hoping that
213− -- resource will be available.
214− threadDelay 1000000
215− acceptNewConnection
216− else
217− -- Assuming the listen socket is closed.
218− 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
219276
220277-- Fork a new worker thread for this connection maker, and ask for a
221278-- function to unmask (i.e., allow async exceptions to be thrown).
222279fork :: Settings
223− -> IO (Connection, Bool)
280+ -> IO (Connection, Transport)
224281 -> SockAddr
225282 -> Application
226− -> D.DateCache
227− -> Maybe F.MutableFdCache
228− -> T.Manager
229283 -> Counter
284+ -> InternalInfo
230285 -> IO ()
231−fork set mkConn addr app dc fc tm counter = settingsFork set $ \ unmask ->
232− -- Run the connection maker to get a new connection, and ensure
233− -- that the connection is closed. If the mkConn call throws an
234− -- exception, we will leak the connection. If the mkConn call is
235− -- vulnerable to attacks (e.g., Slowloris), we do nothing to
236− -- protect the server. It is therefore vital that mkConn is well
237− -- vetted.
238− --
239− -- We grab the connection before registering timeouts since the
240− -- timeouts will be useless during connection creation, due to the
241− -- fact that async exceptions are still masked.
242− 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
243303
244304 -- We need to register a timeout handler for this thread, and
245305 -- cancel that handler as soon as we exit.
246− bracket (T.registerKillThread tm) T.cancel $ \th ->
247−
248− let ii = InternalInfo th fc dc
249− conn = setSendFile conn0 fc
250− -- We now have fully registered a connection close handler
251− -- in the case of all exceptions, so it is safe to one
252− -- again allow async exceptions.
253− in unmask .
254− -- Call the user-supplied on exception code if any
255− -- exceptions are thrown.
256− handle (onE set Nothing) .
257−
258− -- Call the user-supplied code for connection open and close events
259− bracket (onOpen addr) (onClose addr) $ \goingon ->
260−
261− -- Actually serve this connection.
262− -- bracket with closeConn above ensures the connection is closed.
263− when goingon $ serveConnection conn ii addr isSecure' set app
264− where
265− 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
266320
267321 onOpen adr = increase counter >> settingsOnOpen set adr
268322 onClose adr _ = decrease counter >> settingsOnClose set adr
269323
270324serveConnection :: Connection
271325 -> InternalInfo
326+ -> T.Handle
272327 -> SockAddr
273− -> Bool -- ^ is secure?
328+ -> Transport
274329 -> Settings
275330 -> Application
276331 -> IO ()
277−serveConnection conn ii origAddr 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)
278342 istatus <- newIORef False
279− src <- mkSource (connSource conn th istatus)
280− addr <- getProxyProtocolAddr src
281− recvSendLoop addr istatus src `E.catch` \e -> do
282− sendErrorResponse addr istatus e
283− 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
284374
285375 where
286376 getProxyProtocolAddr src =
@@ -323,29 +413,40 @@ serveConnection conn ii origAddr isSecure' settings app = do
323413
324414 decodeAscii = map (chr . fromEnum) . S.unpack
325415
326− th = threadHandle ii
416+ shouldSendErrorResponse se
417+ | Just ConnectionClosedByPeer <- fromException se = False
418+ | otherwise = True
327419
328− sendErrorResponse addr istatus e = do
420+ sendErrorResponse req istatus e = do
329421 status <- readIORef istatus
330− when status $ void $
331− sendResponse
332− (settingsServerName settings)
333− conn ii (dummyreq addr) 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
334426
335427 dummyreq addr = defaultRequest { remoteHost = addr }
336428
337429 errorResponse e = settingsOnExceptionResponse settings e
338430
339− recvSendLoop addr istatus fromClient = do
340− (req', mremainingRef, idxhdr) <- recvRequest settings conn ii addr fromClient
341− let req = req' { isSecure = isSecure' }
342− processRequest addr istatus fromClient req mremainingRef idxhdr
343− `catch` \e -> do
344− -- Call the user-supplied exception handlers, passing the request.
345− sendErrorResponse addr istatus e
346− onE settings (Just req) e
347−
348− processRequest addr istatus fromClient req mremainingRef idxhdr = do
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
349450 -- Let the application run for as long as it wants
350451 T.pause th
351452
@@ -353,50 +454,78 @@ serveConnection conn ii origAddr isSecure' settings app = do
353454 -- creating the request, we need to make sure that we don't get
354455 -- an async exception before calling the ResponseSource.
355456 keepAliveRef <- newIORef $ error "keepAliveRef not filled"
356− _ <- app req $ \res -> do
457+ r <- E.try $ app req $ \res -> do
357458 T.resume th
358459 -- FIXME consider forcing evaluation of the res here to
359460 -- send more meaningful error messages to the user.
360461 -- However, it may affect performance.
361462 writeIORef istatus False
362− keepAlive <- sendResponse
363− (settingsServerName settings)
364− conn ii req idxhdr (readSource fromClient) res
463+ keepAlive <- sendResponse settings conn ii th req idxhdr (readSource src) res
365464 writeIORef keepAliveRef keepAlive
366465 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+
367475 keepAlive <- readIORef keepAliveRef
368476
369477 -- We just send a Response and it takes a time to
370478 -- receive a Request again. If we immediately call recv,
371− -- it is likely to fail and the IO manager works.
372− -- It is very costy. So, we yield to another Haskell
373− -- 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
374482 -- when this Haskell thread will be re-scheduled.
375483 -- This improves performance at least when
376484 -- the number of cores is small.
377485 Conc.yield
378486
379− when keepAlive $ do
487+ if keepAlive
488+ then
380489 -- If there is an unknown or large amount of data to still be read
381490 -- from the request body, simple drop this connection instead of
382491 -- reading it all in to satisfy a keep-alive request.
383492 case settingsMaximumBodyFlush settings of
384493 Nothing -> do
385− flushEntireBody (requestBody req)
494+ flushEntireBody nextBodyFlush
386495 T.resume th
387− recvSendLoop addr istatus fromClient
496+ return True
388497 Just maxToRead -> do
389498 let tryKeepAlive = do
390499 -- flush the rest of the request body
391− isComplete <- flushBody (requestBody req) maxToRead
392− when isComplete $ do
500+ isComplete <- flushBody nextBodyFlush maxToRead
501+ if isComplete then do
393502 T.resume th
394− recvSendLoop addr istatus fromClient
503+ return True
504+ else
505+ return False
395506 case mremainingRef of
396507 Just ref -> do
397508 remaining <- readIORef ref
398− when (remaining <= maxToRead) tryKeepAlive
509+ if remaining <= maxToRead then
510+ tryKeepAlive
511+ else
512+ return False
399513 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
400529
401530flushEntireBody :: IO ByteString -> IO ()
402531flushEntireBody src =
@@ -421,26 +550,50 @@ flushBody src =
421550 | toRead' >= 0 -> loop toRead'
422551 | otherwise -> return False
423552
424−connSource :: Connection -> T.Handle -> IORef Bool -> IO ByteString
425−connSource Connection { connRecv = recv } th istatus = do
553+wrappedRecv :: Connection -> T.Handle -> IORef Bool -> Int -> IO ByteString
554+wrappedRecv Connection { connRecv = recv } th istatus slowlorisSize = do
426555 bs <- recv
427556 unless (S.null bs) $ do
428557 writeIORef istatus True
429− 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
430572 return bs
431573
574+-- | Set flag FileCloseOnExec flag on a socket (on Unix)
575+--
432576-- Copied from: https://github.com/mzero/plush/blob/master/src/Plush/Server/Warp.hs
577+--
578+-- @since 3.2.17
433579setSocketCloseOnExec :: Socket -> IO ()
434580#if WINDOWS
435581setSocketCloseOnExec _ = return ()
436582#else
437−setSocketCloseOnExec socket =
438− 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
439590#endif
440591
441−gracefulShutdown :: Counter -> IO ()
442−gracefulShutdown counter = do
443− -- To avoid race condition, we just use threadDelay, not MVar.
444− threadDelay 10000000
445− noConnections <- isZero counter
446− 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