@@ -1,142 +1,95 @@
1−{-# LANGUAGE BangPatterns #-}
21{-# LANGUAGE CPP #-}
32{-# LANGUAGE OverloadedStrings #-}
4−{-# LANGUAGE PackageImports #-}
5−{-# LANGUAGE PatternGuards #-}
6−{-# LANGUAGE RecordWildCards #-}
73{-# LANGUAGE ScopedTypeVariables #-}
84{-# LANGUAGE TupleSections #-}
9−{-# LANGUAGE ViewPatterns #-}
105{-# OPTIONS_GHC -fno-warn-deprecations #-}
116
127module Network.Wai.Handler.Warp.Run where
138
14−import "iproute" Data.IP (toHostAddress, toHostAddress6)
159import Control.Arrow (first)
10+import Control.Concurrent (threadDelay)
1611import qualified Control.Concurrent as Conc (yield)
1712import Control.Exception as E
13+import Control.Monad (when, unless, void)
14+import Data.ByteString (ByteString)
1815import qualified Data.ByteString as S
1916import Data.Char (chr)
17+import Data.IP (toHostAddress, toHostAddress6)
2018import Data.IORef (IORef, newIORef, readIORef, writeIORef)
2119import Data.Streaming.Network (bindPortTCP)
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
20+import Network (sClose, Socket)
21+import Network.Socket (accept, withSocketsDo, SockAddr(SockAddrInet, SockAddrInet6))
2922import qualified Network.Socket.ByteString as Sock
3023import 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−
3624import Network.Wai.Handler.Warp.Buffer
3725import Network.Wai.Handler.Warp.Counter
3826import qualified Network.Wai.Handler.Warp.Date as D
3927import 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)
4328import Network.Wai.Handler.Warp.Header
44−import Network.Wai.Handler.Warp.Imports hiding (readInt)
4529import Network.Wai.Handler.Warp.ReadInt
4630import Network.Wai.Handler.Warp.Recv
4731import Network.Wai.Handler.Warp.Request
4832import Network.Wai.Handler.Warp.Response
4933import Network.Wai.Handler.Warp.SendFile
5034import Network.Wai.Handler.Warp.Settings
35+import qualified Network.Wai.Handler.Warp.Timeout as T
5136import Network.Wai.Handler.Warp.Types
52−
37+import Network.Wai.Internal (ResponseReceived (ResponseReceived))
38+import System.IO.Error (isFullErrorType, ioeGetErrorType)
5339
5440#if WINDOWS
5541import Network.Wai.Handler.Warp.Windows
5642#else
43+import System.Posix.IO (FdOption(CloseOnExec), setFdOption)
5744import Network.Socket (fdSocket)
5845#endif
5946
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
47+-- | Default action value for 'Connection'.
48+socketConnection :: Socket -> IO Connection
49+socketConnection s = do
50+ readBuf <- allocateBuffer bufferSize
6851 writeBuf <- allocateBuffer bufferSize
69− let sendall = Sock.sendAll s
70− isH2 <- newIORef False -- HTTP/1.x
7152 return Connection {
7253 connSendMany = Sock.sendMany s
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
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
9059 , connWriteBuffer = writeBuf
9160 , connBufferSize = bufferSize
92− , connHTTP2 = isH2
61+ , connSendFileOverride = Override s
9362 }
9463
95−-- | Run an 'Application' on the given port.
96−-- This calls 'runSettings' with 'defaultSettings'.
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'.
9771run :: Port -> Application -> IO ()
9872run p = runSettings defaultSettings { settingsPort = p }
9973
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−
11774-- | Run an 'Application' with the given 'Settings'.
118−-- This opens a listen socket on the port defined in 'Settings' and
119−-- calls 'runSettingsSocket'.
12075runSettings :: Settings -> Application -> IO ()
12176runSettings set app = withSocketsDo $
12277 bracket
12378 (bindPortTCP (settingsPort set) (settingsHost set))
124− close
79+ sClose
12580 (\socket -> do
12681 setSocketCloseOnExec socket
12782 runSettingsSocket set socket app)
12883
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
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
13686-- can be used when reverse HTTP proxying into your application.
13787--
13888-- Note that the 'settingsPort' will still be passed to 'Application's via the
13989-- 'serverPort' record.
90+--
91+-- When the listen socket in the second argument is closed, all live
92+-- connections are gracefully shut down.
14093runSettingsSocket :: Settings -> Socket -> Application -> IO ()
14194runSettingsSocket set socket app = do
14295 settingsInstallShutdownHandler set closeListenSocket
@@ -149,20 +102,15 @@ runSettingsSocket set socket app = do
149102 (s, sa) <- accept socket
150103#endif
151104 setSocketCloseOnExec s
152− -- NoDelay causes an error for AF_UNIX.
153− setSocketOption s NoDelay 1 `E.catch` \(E.SomeException _) -> return ()
154− conn <- socketConnection set s
105+ conn <- socketConnection s
155106 return (conn, sa)
156107
157− closeListenSocket = close socket
108+ closeListenSocket = sClose socket
158109
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.
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.
166114--
167115-- Since 1.3.5
168116runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()
@@ -172,46 +120,41 @@ runSettingsConnection set getConn app = runSettingsConnectionMaker set getConnMa
172120 (conn, sa) <- getConn
173121 return (return conn, sa)
174122
175−-- | This modifies the connection maker so that it returns 'TCP' for 'Transport'
176−-- (i.e. plain HTTP) then calls 'runSettingsConnectionMakerSecure'.
177123runSettingsConnectionMaker :: Settings -> IO (IO Connection, SockAddr) -> Application -> IO ()
178124runSettingsConnectionMaker x y =
179− runSettingsConnectionMakerSecure x (toTCP <$> y)
125+ runSettingsConnectionMakerSecure x (go y)
180126 where
181− toTCP = first ((, TCP) <$>)
127+ go = fmap (first (fmap (, False)))
182128
183129----------------------------------------------------------------
184130
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.
131+-- | Allows you to provide a function which will return a function
132+-- which will return 'Connection'.
189133--
190134-- Since 2.1.4
191−runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Transport), SockAddr) -> Application -> IO ()
135+runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Bool), SockAddr) -> Application -> IO ()
192136runSettingsConnectionMakerSecure set getConnMaker app = do
193137 settingsBeforeMainLoop set
194138 counter <- newCounter
195− withII $ acceptConnection set getConnMaker app counter
139+
140+ D.withDateCache $ \dc ->
141+ F.withFdCache fdCacheDurationInSeconds $ \fc ->
142+ withTimeoutManager $ \tm ->
143+ acceptConnection set getConnMaker app dc fc tm counter
196144 where
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
145+ fdCacheDurationInSeconds = settingsFdCacheDuration set * 1000000
208146 withTimeoutManager f = case settingsManager set of
209147 Just tm -> f tm
210148 Nothing -> bracket
211− (T.initialize timeoutInSeconds)
149+ (T.initialize $ settingsTimeout set * 1000000)
212150 T.stopManager
213151 f
214152
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+
215158-- Note that there is a thorough discussion of the exception safety of the
216159-- following code at: https://github.com/yesodweb/wai/issues/146
217160--
@@ -226,22 +169,19 @@ runSettingsConnectionMakerSecure set getConnMaker app = do
226169--
227170-- Our approach is explained in the comments below.
228171acceptConnection :: Settings
229− -> IO (IO (Connection, Transport), SockAddr)
172+ -> IO (IO (Connection, Bool), SockAddr)
230173 -> Application
174+ -> D.DateCache
175+ -> Maybe F.MutableFdCache
176+ -> T.Manager
231177 -> Counter
232− -> InternalInfo
233178 -> IO ()
234−acceptConnection set getConnMaker app counter ii = do
179+acceptConnection set getConnMaker app dc fc tm counter = do
235180 -- First mask all exceptions in acceptLoop. This is necessary to
236181 -- ensure that no async exception is throw between the call to
237182 -- 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
183+ void $ mask_ $ acceptLoop
184+ gracefulShutdown counter
245185 where
246186 acceptLoop = do
247187 -- Allow async exceptions before receiving the next connection maker.
@@ -258,119 +198,89 @@ acceptConnection set getConnMaker app counter ii = do
258198 case mx of
259199 Nothing -> return ()
260200 Just (mkConn, addr) -> do
261− fork set mkConn addr app counter ii
201+ fork set mkConn addr app dc fc tm counter
262202 acceptLoop
263203
264204 acceptNewConnection = do
265205 ex <- try getConnMaker
266206 case ex of
267207 Right x -> return $ Just x
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
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
276219
277220-- Fork a new worker thread for this connection maker, and ask for a
278221-- function to unmask (i.e., allow async exceptions to be thrown).
279222fork :: Settings
280− -> IO (Connection, Transport)
223+ -> IO (Connection, Bool)
281224 -> SockAddr
282225 -> Application
226+ -> D.DateCache
227+ -> Maybe F.MutableFdCache
228+ -> T.Manager
283229 -> Counter
284− -> InternalInfo
285230 -> IO ()
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
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') ->
303243
304244 -- We need to register a timeout handler for this thread, and
305245 -- cancel that handler as soon as we exit.
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
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
320266
321267 onOpen adr = increase counter >> settingsOnOpen set adr
322268 onClose adr _ = decrease counter >> settingsOnClose set adr
323269
324270serveConnection :: Connection
325271 -> InternalInfo
326− -> T.Handle
327272 -> SockAddr
328− -> Transport
273+ -> Bool -- ^ is secure?
329274 -> Settings
330275 -> Application
331276 -> IO ()
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)
277+serveConnection conn ii origAddr isSecure' settings app = do
342278 istatus <- newIORef False
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
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)
374284
375285 where
376286 getProxyProtocolAddr src =
@@ -413,40 +323,29 @@ serveConnection conn ii th origAddr transport settings app = do
413323
414324 decodeAscii = map (chr . fromEnum) . S.unpack
415325
416− shouldSendErrorResponse se
417− | Just ConnectionClosedByPeer <- fromException se = False
418− | otherwise = True
326+ th = threadHandle ii
419327
420− sendErrorResponse req istatus e = do
328+ sendErrorResponse addr istatus e = do
421329 status <- readIORef istatus
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
330+ when status $ void $
331+ sendResponse
332+ (settingsServerName settings)
333+ conn ii (dummyreq addr) defaultIndexRequestHeader (return S.empty) (errorResponse e)
426334
427335 dummyreq addr = defaultRequest { remoteHost = addr }
428336
429337 errorResponse e = settingsOnExceptionResponse settings e
430338
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
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
450349 -- Let the application run for as long as it wants
451350 T.pause th
452351
@@ -454,78 +353,50 @@ serveConnection conn ii th origAddr transport settings app = do
454353 -- creating the request, we need to make sure that we don't get
455354 -- an async exception before calling the ResponseSource.
456355 keepAliveRef <- newIORef $ error "keepAliveRef not filled"
457− r <- E.try $ app req $ \res -> do
356+ _ <- app req $ \res -> do
458357 T.resume th
459358 -- FIXME consider forcing evaluation of the res here to
460359 -- send more meaningful error messages to the user.
461360 -- However, it may affect performance.
462361 writeIORef istatus False
463− keepAlive <- sendResponse settings conn ii th req idxhdr (readSource src) res
362+ keepAlive <- sendResponse
363+ (settingsServerName settings)
364+ conn ii req idxhdr (readSource fromClient) res
464365 writeIORef keepAliveRef keepAlive
465366 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−
475367 keepAlive <- readIORef keepAliveRef
476368
477369 -- We just send a Response and it takes a time to
478370 -- receive a Request again. If we immediately call recv,
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
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
482374 -- when this Haskell thread will be re-scheduled.
483375 -- This improves performance at least when
484376 -- the number of cores is small.
485377 Conc.yield
486378
487− if keepAlive
488− then
379+ when keepAlive $ do
489380 -- If there is an unknown or large amount of data to still be read
490381 -- from the request body, simple drop this connection instead of
491382 -- reading it all in to satisfy a keep-alive request.
492383 case settingsMaximumBodyFlush settings of
493384 Nothing -> do
494− flushEntireBody nextBodyFlush
385+ flushEntireBody (requestBody req)
495386 T.resume th
496− return True
387+ recvSendLoop addr istatus fromClient
497388 Just maxToRead -> do
498389 let tryKeepAlive = do
499390 -- flush the rest of the request body
500− isComplete <- flushBody nextBodyFlush maxToRead
501− if isComplete then do
391+ isComplete <- flushBody (requestBody req) maxToRead
392+ when isComplete $ do
502393 T.resume th
503− return True
504− else
505− return False
394+ recvSendLoop addr istatus fromClient
506395 case mremainingRef of
507396 Just ref -> do
508397 remaining <- readIORef ref
509− if remaining <= maxToRead then
510− tryKeepAlive
511− else
512− return False
398+ when (remaining <= maxToRead) tryKeepAlive
513399 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
529400
530401flushEntireBody :: IO ByteString -> IO ()
531402flushEntireBody src =
@@ -550,50 +421,26 @@ flushBody src =
550421 | toRead' >= 0 -> loop toRead'
551422 | otherwise -> return False
552423
553−wrappedRecv :: Connection -> T.Handle -> IORef Bool -> Int -> IO ByteString
554−wrappedRecv Connection { connRecv = recv } th istatus slowlorisSize = do
424+connSource :: Connection -> T.Handle -> IORef Bool -> IO ByteString
425+connSource Connection { connRecv = recv } th istatus = do
555426 bs <- recv
556427 unless (S.null bs) $ do
557428 writeIORef istatus True
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
429+ when (S.length bs >= 2048) $ T.tickle th
572430 return bs
573431
574−-- | Set flag FileCloseOnExec flag on a socket (on Unix)
575−--
576432-- Copied from: https://github.com/mzero/plush/blob/master/src/Plush/Server/Warp.hs
577−--
578−-- @since 3.2.17
579433setSocketCloseOnExec :: Socket -> IO ()
580434#if WINDOWS
581435setSocketCloseOnExec _ = return ()
582436#else
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
437+setSocketCloseOnExec socket =
438+ setFdOption (fromIntegral $ fdSocket socket) CloseOnExec True
590439#endif
591440
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
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