@@ -1,90 +1,145 @@
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
37+import Network.Wai.Handler.Warp.Counter
2338import qualified Network.Wai.Handler.Warp.Date as D
2439import 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)
2543import Network.Wai.Handler.Warp.Header
44+import Network.Wai.Handler.Warp.Imports hiding (readInt)
45+import Network.Wai.Handler.Warp.ReadInt
2646import Network.Wai.Handler.Warp.Recv
2747import Network.Wai.Handler.Warp.Request
2848import Network.Wai.Handler.Warp.Response
2949import Network.Wai.Handler.Warp.SendFile
3050import Network.Wai.Handler.Warp.Settings
31−import qualified Network.Wai.Handler.Warp.Timeout as T
3251import Network.Wai.Handler.Warp.Types
33−import Network.Wai.Internal (ResponseReceived (ResponseReceived))
34−import System.IO.Error (isFullErrorType, ioeGetErrorType)
52+
3553
3654#if WINDOWS
3755import Network.Wai.Handler.Warp.Windows
3856#else
39−import System.Posix.IO (FdOption(CloseOnExec), setFdOption)
4057import Network.Socket (fdSocket)
4158#endif
4259
43−-- | Default action value for 'Connection'.
44−socketConnection :: Socket -> IO Connection
45−socketConnection s = do
46− 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
4768 writeBuf <- allocateBuffer bufferSize
69+ let sendall = Sock.sendAll s
70+ isH2 <- newIORef False -- HTTP/1.x
4871 return Connection {
4972 connSendMany = Sock.sendMany s
50− , connSendAll = Sock.sendAll s
51− , connSendFile = defaultSendFile s
52− , connClose = sClose s >> freeBuffer readBuf >> freeBuffer writeBuf
53− , connRecv = receive s readBuf bufferSize
54− , 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
5590 , connWriteBuffer = writeBuf
5691 , connBufferSize = bufferSize
57− , connSendFileOverride = Override s
92+ , connHTTP2 = isH2
5893 }
5994
60−#if __GLASGOW_HASKELL__ < 702
61−allowInterrupt :: IO ()
62−allowInterrupt = unblock $ return ()
63−#endif
64−
65−-- | Run an 'Application' on the given port. This calls 'runSettings' with
66−-- 'defaultSettings'.
95+-- | Run an 'Application' on the given port.
96+-- This calls 'runSettings' with 'defaultSettings'.
6797run :: Port -> Application -> IO ()
6898run p = runSettings defaultSettings { settingsPort = p }
6999
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+
70117-- | Run an 'Application' with the given 'Settings'.
118+-- This opens a listen socket on the port defined in 'Settings' and
119+-- calls 'runSettingsSocket'.
71120runSettings :: Settings -> Application -> IO ()
72121runSettings set app = withSocketsDo $
73122 bracket
74123 (bindPortTCP (settingsPort set) (settingsHost set))
75− sClose
124+ close
76125 (\socket -> do
77126 setSocketCloseOnExec socket
78127 runSettingsSocket set socket app)
79128
80−-- | Same as 'runSettings', but uses a user-supplied socket instead of opening
81−-- 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
82136-- can be used when reverse HTTP proxying into your application.
83137--
84138-- Note that the 'settingsPort' will still be passed to 'Application's via the
85139-- 'serverPort' record.
86140runSettingsSocket :: Settings -> Socket -> Application -> IO ()
87−runSettingsSocket set socket app =
141+runSettingsSocket set socket app = do
142+ settingsInstallShutdownHandler set closeListenSocket
88143 runSettingsConnection set getConn app
89144 where
90145 getConn = do
@@ -94,13 +149,20 @@ runSettingsSocket set socket app =
94149 (s, sa) <- accept socket
95150#endif
96151 setSocketCloseOnExec s
97− 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
98155 return (conn, sa)
99156
100−-- | Allows you to provide a function which will return a 'Connection'. In
101−-- cases where creating the @Connection@ can be expensive, this allows the
102−-- expensive computations to be performed in a separate thread instead of the
103−-- main server loop.
157+ closeListenSocket = close socket
158+
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.
104166--
105167-- Since 1.3.5
106168runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()
@@ -110,40 +172,46 @@ runSettingsConnection set getConn app = runSettingsConnectionMaker set getConnMa
110172 (conn, sa) <- getConn
111173 return (return conn, sa)
112174
175+-- | This modifies the connection maker so that it returns 'TCP' for 'Transport'
176+-- (i.e. plain HTTP) then calls 'runSettingsConnectionMakerSecure'.
113177runSettingsConnectionMaker :: Settings -> IO (IO Connection, SockAddr) -> Application -> IO ()
114178runSettingsConnectionMaker x y =
115− runSettingsConnectionMakerSecure x (go y)
179+ runSettingsConnectionMakerSecure x (toTCP <$> y)
116180 where
117− go = fmap (first (fmap (, False)))
181+ toTCP = first ((, TCP) <$>)
118182
119183----------------------------------------------------------------
120184
121−-- | Allows you to provide a function which will return a function
122−-- 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.
123189--
124190-- Since 2.1.4
125−runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Bool), SockAddr) -> Application -> IO ()
191+runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Transport), SockAddr) -> Application -> IO ()
126192runSettingsConnectionMakerSecure set getConnMaker app = do
127193 settingsBeforeMainLoop set
128−
129− D.withDateCache $ \dc ->
130− F.withFdCache fdCacheDurationInSeconds $ \fc ->
131− withTimeoutManager $ \tm ->
132− acceptConnection set getConnMaker app dc fc tm
194+ counter <- newCounter
195+ withII $ acceptConnection set getConnMaker app counter
133196 where
134− 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
135208 withTimeoutManager f = case settingsManager set of
136209 Just tm -> f tm
137210 Nothing -> bracket
138− (T.initialize $ settingsTimeout set * 1000000)
211+ (T.initialize timeoutInSeconds)
139212 T.stopManager
140213 f
141214
142−onE :: Settings -> Maybe Request -> SomeException -> IO ()
143−onE set mreq e = case fromException e of
144− Just (NotEnoughLines []) -> return ()
145− _ -> settingsOnException set mreq e
146−
147215-- Note that there is a thorough discussion of the exception safety of the
148216-- following code at: https://github.com/yesodweb/wai/issues/146
149217--
@@ -152,134 +220,233 @@ onE set mreq e = case fromException e of
152220-- 1. Asynchronous exceptions are not blocked entirely in the main loop.
153221-- Doing so would make it impossible to kill the Warp thread.
154222--
155−-- 2. Once a connection maker is received via getConnLoop, the connection
156−-- is guaranteed to be closed, even in the presence of async exceptions.
223+-- 2. Once a connection maker is received via acceptNewConnection, the
224+-- connection is guaranteed to be closed, even in the presence of
225+-- async exceptions.
157226--
158227-- Our approach is explained in the comments below.
159228acceptConnection :: Settings
160− -> IO (IO (Connection, Bool), SockAddr)
229+ -> IO (IO (Connection, Transport), SockAddr)
161230 -> Application
162− -> D.DateCache
163− -> Maybe F.MutableFdCache
164− -> T.Manager
231+ -> Counter
232+ -> InternalInfo
165233 -> IO ()
166−-- First mask all exceptions in the main loop. This is necessary to ensure
167−-- that no async exception is throw between the call to getConnLoop and the
168−-- registering of connClose.
169−acceptConnection set getConnMaker app dc fc tm = do
170− -- Allow async exceptions before receiving the next connection maker.
171− shutdown <- mask_ $ do
172− -- getConnLoop will try to receive the next incoming
234+acceptConnection set getConnMaker app counter ii = do
235+ -- First mask all exceptions in acceptLoop. This is necessary to
236+ -- ensure that no async exception is throw between the call to
237+ -- acceptNewConnection and the registering of connClose.
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
245+ where
246+ acceptLoop = do
247+ -- Allow async exceptions before receiving the next connection maker.
248+ allowInterrupt
249+
250+ -- acceptNewConnection will try to receive the next incoming
173251 -- request. It returns a /connection maker/, not a connection,
174252 -- since in some circumstances creating a working connection
175253 -- from a raw socket may be an expensive operation, and this
176254 -- expensive work should not be performed in the main event
177255 -- loop. An example of something expensive would be TLS
178256 -- negotiation.
179− mx <- getConnLoop
257+ mx <- acceptNewConnection
180258 case mx of
181− Nothing -> return True
259+ Nothing -> return ()
182260 Just (mkConn, addr) -> do
183− fork set mkConn addr app dc fc tm
184− return False
185− if shutdown then
186− gracefulShutdown
187− else
188− acceptConnection set getConnMaker app dc fc tm
189− where
190− getConnLoop = do
261+ fork set mkConn addr app counter ii
262+ acceptLoop
263+
264+ acceptNewConnection = do
191265 ex <- try getConnMaker
192266 case ex of
193267 Right x -> return $ Just x
194− Left e -> do
195− onE set Nothing $ toException e
196− if isFullErrorType (ioeGetErrorType e) then do
197− -- "resource exhausted (Too many open files)" may
198− -- happen by accept(). Wait a second hoping that
199− -- resource will be available.
200− threadDelay 1000000
201− getConnLoop
202− else
203− 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
204276
205277-- Fork a new worker thread for this connection maker, and ask for a
206278-- function to unmask (i.e., allow async exceptions to be thrown).
207279fork :: Settings
208− -> IO (Connection, Bool)
280+ -> IO (Connection, Transport)
209281 -> SockAddr
210282 -> Application
211− -> D.DateCache
212− -> Maybe F.MutableFdCache
213− -> T.Manager
283+ -> Counter
284+ -> InternalInfo
214285 -> IO ()
215−fork set mkConn addr app dc fc tm = void $ forkIOWithUnmask $ \unmask ->
216− -- Run the connection maker to get a new connection, and ensure
217− -- that the connection is closed. If the mkConn call throws an
218− -- exception, we will leak the connection. If the mkConn call is
219− -- vulnerable to attacks (e.g., Slowloris), we do nothing to
220− -- protect the server. It is therefore vital that mkConn is well
221− -- vetted.
222− --
223− -- We grab the connection before registering timeouts since the
224− -- timeouts will be useless during connection creation, due to the
225− -- fact that async exceptions are still masked.
226− 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
227303
228304 -- We need to register a timeout handler for this thread, and
229305 -- cancel that handler as soon as we exit.
230− bracket (T.registerKillThread tm) T.cancel $ \th ->
231−
232− let ii = InternalInfo th fc dc
233− conn = setSendFile conn0 fc
234− -- We now have fully registered a connection close handler
235− -- in the case of all exceptions, so it is safe to one
236− -- again allow async exceptions.
237− in unmask .
238− -- Call the user-supplied on exception code if any
239− -- exceptions are thrown.
240− handle (onE set Nothing) .
241−
242− -- Call the user-supplied code for connection open and close events
243− bracket (onOpen addr) (onClose addr) $ \goingon ->
244−
245− -- Actually serve this connection.
246− -- onnClose above ensures the termination of the connection.
247− when goingon $ serveConnection conn ii addr isSecure' set app
248− where
249− closeConn (conn, _isSecure) = connClose conn
250−
251− onOpen = settingsOnOpen set
252− onClose adr _ = settingsOnClose set adr
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
320+
321+ onOpen adr = increase counter >> settingsOnOpen set adr
322+ onClose adr _ = decrease counter >> settingsOnClose set adr
253323
254324serveConnection :: Connection
255325 -> InternalInfo
326+ -> T.Handle
256327 -> SockAddr
257− -> Bool -- ^ is secure?
328+ -> Transport
258329 -> Settings
259330 -> Application
260331 -> IO ()
261−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)
262342 istatus <- newIORef False
263− src <- mkSource (connSource conn th istatus)
264− recvSendLoop istatus src `E.catch` \e -> do
265− sendErrorResponse istatus e
266− 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
267374
268375 where
269− th = threadHandle ii
270−
271− 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
272421 status <- readIORef istatus
273− when status $ void $
274− 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
275426
276− dummyreq = defaultRequest { remoteHost = addr }
427+ dummyreq addr = defaultRequest { remoteHost = addr }
277428
278429 errorResponse e = settingsOnExceptionResponse settings e
279430
280− recvSendLoop istatus fromClient = do
281− (req', idxhdr) <- recvRequest settings conn ii addr fromClient
282− 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
283450 -- Let the application run for as long as it wants
284451 T.pause th
285452
@@ -287,57 +454,146 @@ serveConnection conn ii addr isSecure' settings app = do
287454 -- creating the request, we need to make sure that we don't get
288455 -- an async exception before calling the ResponseSource.
289456 keepAliveRef <- newIORef $ error "keepAliveRef not filled"
290− _ <- app req $ \res -> do
457+ r <- E.try $ app req $ \res -> do
291458 T.resume th
292459 -- FIXME consider forcing evaluation of the res here to
293460 -- send more meaningful error messages to the user.
294461 -- However, it may affect performance.
295462 writeIORef istatus False
296− keepAlive <- sendResponse conn ii req idxhdr (readSource fromClient) res
463+ keepAlive <- sendResponse settings conn ii th req idxhdr (readSource src) res
297464 writeIORef keepAliveRef keepAlive
298465 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+
299475 keepAlive <- readIORef keepAliveRef
300476
301477 -- We just send a Response and it takes a time to
302478 -- receive a Request again. If we immediately call recv,
303− -- it is likely to fail and the IO manager works.
304− -- It is very costy. So, we yield to another Haskell
305− -- 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
306482 -- when this Haskell thread will be re-scheduled.
307483 -- This improves performance at least when
308484 -- the number of cores is small.
309485 Conc.yield
310486
311− when keepAlive $ do
312− -- flush the rest of the request body
313− flushBody $ requestBody req
314− T.resume th
315− 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
316529
317−flushBody :: IO ByteString -> IO ()
318−flushBody src =
530+flushEntireBody :: IO ByteString -> IO ()
531+flushEntireBody src =
319532 loop
320533 where
321534 loop = do
322535 bs <- src
323536 unless (S.null bs) loop
324537
325−connSource :: Connection -> T.Handle -> IORef Bool -> IO ByteString
326−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
327555 bs <- recv
328556 unless (S.null bs) $ do
329557 writeIORef istatus True
330− 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
331572 return bs
332573
574+-- | Set flag FileCloseOnExec flag on a socket (on Unix)
575+--
333576-- Copied from: https://github.com/mzero/plush/blob/master/src/Plush/Server/Warp.hs
577+--
578+-- @since 3.2.17
334579setSocketCloseOnExec :: Socket -> IO ()
335580#if WINDOWS
336581setSocketCloseOnExec _ = return ()
337582#else
338−setSocketCloseOnExec socket =
339− 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
340590#endif
341591
342−gracefulShutdown :: IO ()
343−gracefulShutdown = return ()
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