@@ -1,168 +1,113 @@
1−{-# LANGUAGE BangPatterns #-}
21{-# LANGUAGE CPP #-}
32{-# LANGUAGE OverloadedStrings #-}
4−{-# LANGUAGE PackageImports #-}
5−{-# LANGUAGE PatternGuards #-}
6−{-# LANGUAGE RecordWildCards #-}
73{-# LANGUAGE ScopedTypeVariables #-}
8−{-# LANGUAGE TupleSections #-}
9−{-# LANGUAGE ViewPatterns #-}
10−{-# OPTIONS_GHC -fno-warn-deprecations #-}
114
125module Network.Wai.Handler.Warp.Run where
136
14−import "iproute" Data.IP (toHostAddress, toHostAddress6)
15−import Control.Arrow (first)
7+import Control.Concurrent (threadDelay, forkIOWithUnmask)
168import qualified Control.Concurrent as Conc (yield)
179import Control.Exception as E
10+import Control.Monad (forever, when, unless, void)
11+import Control.Monad.IO.Class (liftIO)
12+import Data.ByteString (ByteString)
1813import qualified Data.ByteString as S
19−import Data.Char (chr)
20−import Data.IORef (IORef, newIORef, readIORef, writeIORef)
21−import 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
14+import Data.Conduit
15+import Data.Conduit.Internal (ResumableSource (..))
16+import qualified Data.Conduit.List as CL
17+import Data.Conduit.Network (bindPort)
18+import Network (sClose, Socket)
19+import qualified Network.HTTP.Types as H
20+import Network.Socket (accept, SockAddr)
2921import qualified Network.Socket.ByteString as Sock
3022import 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−
36−import Network.Wai.Handler.Warp.Buffer
37−import Network.Wai.Handler.Warp.Counter
38−import qualified Network.Wai.Handler.Warp.Date as D
3923import 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)
43−import Network.Wai.Handler.Warp.Header
44−import Network.Wai.Handler.Warp.Imports hiding (readInt)
45−import Network.Wai.Handler.Warp.ReadInt
4624import Network.Wai.Handler.Warp.Recv
4725import Network.Wai.Handler.Warp.Request
4826import Network.Wai.Handler.Warp.Response
49−import Network.Wai.Handler.Warp.SendFile
5027import Network.Wai.Handler.Warp.Settings
28+import qualified Network.Wai.Handler.Warp.Timeout as T
5129import Network.Wai.Handler.Warp.Types
52−
30+import Network.Wai.Handler.Warp.SendFile
5331
5432#if WINDOWS
55−import Network.Wai.Handler.Warp.Windows
33+import qualified Control.Concurrent.MVar as MV
34+import Network.Socket (withSocketsDo)
35+import Control.Concurrent (forkIO)
5636#else
37+import System.Posix.IO (FdOption(CloseOnExec), setFdOption)
5738import Network.Socket (fdSocket)
5839#endif
5940
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
68− writeBuf <- allocateBuffer bufferSize
69− let sendall = Sock.sendAll s
70− isH2 <- newIORef False -- HTTP/1.x
41+-- FIXME come up with good values here
42+bytesPerRead :: Int
43+bytesPerRead = 4096
44+
45+-- | Default action value for 'Connection'.
46+socketConnection :: Socket -> IO Connection
47+socketConnection s = do
48+ buf <- allocateRecvBuffer bytesPerRead
7149 return Connection {
7250 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
90− , connWriteBuffer = writeBuf
91− , connBufferSize = bufferSize
92− , connHTTP2 = isH2
51+ , connSendAll = Sock.sendAll s
52+ , connSendFile = defaultSendFile s
53+ , connClose = sClose s >> freeRecvBuffer buf
54+ , connRecv = receive s buf bytesPerRead
55+ , connSendFileOverride = Override s
9356 }
9457
95−-- | Run an 'Application' on the given port.
96−-- This calls 'runSettings' with 'defaultSettings'.
58+#if __GLASGOW_HASKELL__ < 702
59+allowInterrupt :: IO ()
60+allowInterrupt = unblock $ return ()
61+#endif
62+
63+-- | Run an 'Application' on the given port. This calls 'runSettings' with
64+-- 'defaultSettings'.
9765run :: Port -> Application -> IO ()
9866run p = runSettings defaultSettings { settingsPort = p }
9967
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−
117−-- | Run an 'Application' with the given 'Settings'.
118−-- This opens a listen socket on the port defined in 'Settings' and
119−-- calls 'runSettingsSocket'.
68+-- | Run an 'Applicatoin' with the given 'Settings'.
12069runSettings :: Settings -> Application -> IO ()
121−runSettings set app = withSocketsDo $
70+#if WINDOWS
71+runSettings set app = withSocketsDo $ do
72+ var <- MV.newMVar Nothing
73+ let clean = MV.modifyMVar_ var $ \s -> maybe (return ()) sClose s >> return Nothing
74+ void . forkIO $ bracket
75+ (bindPort (settingsPort set) (settingsHost set))
76+ (const clean)
77+ (\s -> do
78+ MV.modifyMVar_ var (\_ -> return $ Just s)
79+ runSettingsSocket set s app)
80+ forever (threadDelay maxBound) `finally` clean
81+#else
82+runSettings set app =
12283 bracket
123− (bindPortTCP (settingsPort set) (settingsHost set))
124− close
84+ (bindPort (settingsPort set) (settingsHost set))
85+ sClose
12586 (\socket -> do
12687 setSocketCloseOnExec socket
12788 runSettingsSocket set socket app)
89+#endif
12890
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
91+-- | Same as 'runSettings', but uses a user-supplied socket instead of opening
92+-- one. This allows the user to provide, for example, Unix named socket, which
13693-- can be used when reverse HTTP proxying into your application.
13794--
13895-- Note that the 'settingsPort' will still be passed to 'Application's via the
13996-- 'serverPort' record.
14097runSettingsSocket :: Settings -> Socket -> Application -> IO ()
141−runSettingsSocket set socket app = do
142− settingsInstallShutdownHandler set closeListenSocket
98+runSettingsSocket set socket app =
14399 runSettingsConnection set getConn app
144100 where
145101 getConn = do
146−#if WINDOWS
147− (s, sa) <- windowsThreadBlockHack $ accept socket
148−#else
149102 (s, sa) <- accept socket
150−#endif
151103 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
104+ conn <- socketConnection s
155105 return (conn, sa)
156106
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.
107+-- | Allows you to provide a function which will return a 'Connection'. In
108+-- cases where creating the @Connection@ can be expensive, this allows the
109+-- expensive computations to be performed in a separate thread instead of the
110+-- main server loop.
166111--
167112-- Since 1.3.5
168113runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()
@@ -172,428 +117,161 @@ runSettingsConnection set getConn app = runSettingsConnectionMaker set getConnMa
172117 (conn, sa) <- getConn
173118 return (return conn, sa)
174119
175−-- | This modifies the connection maker so that it returns 'TCP' for 'Transport'
176−-- (i.e. plain HTTP) then calls 'runSettingsConnectionMakerSecure'.
120+-- | Allows you to provide a function which will return a function
121+-- which will return 'Connection'.
177122runSettingsConnectionMaker :: Settings -> IO (IO Connection, SockAddr) -> Application -> IO ()
178−runSettingsConnectionMaker x y =
179− runSettingsConnectionMakerSecure x (toTCP <$> y)
180− where
181− toTCP = first ((, TCP) <$>)
182−
183−----------------------------------------------------------------
184−
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.
189−--
190−-- Since 2.1.4
191−runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Transport), SockAddr) -> Application -> IO ()
192−runSettingsConnectionMakerSecure set getConnMaker app = do
123+runSettingsConnectionMaker set getConnMaker app = do
193124 settingsBeforeMainLoop set
194− counter <- newCounter
195− withII $ acceptConnection set getConnMaker app counter
196− 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
208− withTimeoutManager f = case settingsManager set of
209− Just tm -> f tm
210− Nothing -> bracket
211− (T.initialize timeoutInSeconds)
212− T.stopManager
213− f
214125
215−-- Note that there is a thorough discussion of the exception safety of the
216−-- following code at: https://github.com/yesodweb/wai/issues/146
217−--
218−-- We need to make sure of two things:
219−--
220−-- 1. Asynchronous exceptions are not blocked entirely in the main loop.
221−-- Doing so would make it impossible to kill the Warp thread.
222−--
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.
226−--
227−-- Our approach is explained in the comments below.
228−acceptConnection :: Settings
229− -> IO (IO (Connection, Transport), SockAddr)
230− -> Application
231− -> Counter
232− -> InternalInfo
233− -> IO ()
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.
126+ -- Note that there is a thorough discussion of the exception safety of the
127+ -- following code at: https://github.com/yesodweb/wai/issues/146
238128 --
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
129+ -- We need to make sure of two things:
130+ --
131+ -- 1. Asynchronous exceptions are not blocked entirely in the main loop.
132+ -- Doing so would make it impossible to kill the Warp thread.
133+ --
134+ -- 2. Once a connection maker is received via getConnLoop, the connection
135+ -- is guaranteed to be closed, even in the presence of async exceptions.
136+ --
137+ -- Our approach is explained in the comments below.
138+
139+ -- First mask all exceptions in the main loop. This is necessary to ensure
140+ -- that no async exception is throw between the call to getConnLoop and the
141+ -- registering of connClose.
142+ F.withFdCache (settingsFdCacheDuration set * 1000000) $ \fc -> do
143+ withTimeoutManager $ \tm -> mask_ . forever $ do
247144 -- Allow async exceptions before receiving the next connection maker.
248145 allowInterrupt
249146
250− -- acceptNewConnection will try to receive the next incoming
251− -- request. It returns a /connection maker/, not a connection,
252− -- since in some circumstances creating a working connection
253− -- from a raw socket may be an expensive operation, and this
254− -- expensive work should not be performed in the main event
255− -- loop. An example of something expensive would be TLS
256− -- negotiation.
257− mx <- acceptNewConnection
258− case mx of
259− Nothing -> return ()
260− Just (mkConn, addr) -> do
261− fork set mkConn addr app counter ii
262− acceptLoop
147+ -- getConnLoop will try to receive the next incoming request. It
148+ -- returns a /connection maker/, not a connection, since in some
149+ -- circumstances creating a working connection from a raw socket may be
150+ -- an expensive operation, and this expensive work should not be
151+ -- performed in the main event loop. An example of something expensive
152+ -- would be TLS negotiation.
153+ (mkConn, addr) <- getConnLoop
263154
264− acceptNewConnection = do
265− ex <- try getConnMaker
266− case ex of
267− 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
276−
277−-- Fork a new worker thread for this connection maker, and ask for a
278−-- function to unmask (i.e., allow async exceptions to be thrown).
279−fork :: Settings
280− -> IO (Connection, Transport)
281− -> SockAddr
282− -> Application
283− -> Counter
284− -> InternalInfo
285− -> 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.
155+ -- Fork a new worker thread for this connection maker, and ask for a
156+ -- function to unmask (i.e., allow async exceptions to be thrown).
296157 --
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)
158+ -- GHC 7.8 cannot infer the type of "void . forkIOWithUnmask"
159+ void $ forkIOWithUnmask $ \unmask ->
160+ -- Run the connection maker to get a new connection, and ensure
161+ -- that the connection is closed. If the mkConn call throws an
162+ -- exception, we will leak the connection. If the mkConn call is
163+ -- vulnerable to attacks (e.g., Slowloris), we do nothing to
164+ -- protect the server. It is therefore vital that mkConn is well
165+ -- vetted.
166+ --
167+ -- We grab the connection before registering timeouts since the
168+ -- timeouts will be useless during connection creation, due to the
169+ -- fact that async exceptions are still masked.
170+ bracket mkConn connClose $ \conn' ->
171+
172+ -- We need to register a timeout handler for this thread, and
173+ -- cancel that handler as soon as we exit.
174+ bracket (T.registerKillThread tm) T.cancel $ \th ->
175+ let ii = InternalInfo th fc
176+ conn = setSendFile conn' fc
177+ -- We now have fully registered a connection close handler
178+ -- in the case of all exceptions, so it is safe to one
179+ -- again allow async exceptions.
180+ in unmask .
181+ -- Call the user-supplied on exception code if any
182+ -- exceptions are thrown.
183+ handle (onE Nothing) .
184+
185+ -- Call the user-supplied code for connection open and close events
186+ bracket_ onOpen onClose $
187+
188+ -- Actually serve this connection.
189+ serveConnection th set ii app conn addr
301190 where
302− cleanUp (conn, _) = connClose conn `finally` connFree conn
303−
304− -- We need to register a timeout handler for this thread, and
305− -- 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
320−
321− onOpen adr = increase counter >> settingsOnOpen set adr
322− onClose adr _ = decrease counter >> settingsOnClose set adr
323−
324−serveConnection :: Connection
325− -> InternalInfo
326− -> T.Handle
327− -> SockAddr
328− -> Transport
191+ -- FIXME: only IOEception is caught. What about other exceptions?
192+ getConnLoop = getConnMaker `E.catch` \(e :: IOException) -> do
193+ onE Nothing (toException e)
194+ -- "resource exhausted (Too many open files)" may happen by accept().
195+ -- Wait a second hoping that resource will be available.
196+ threadDelay 1000000
197+ getConnLoop
198+ onE = settingsOnException set
199+ onOpen = settingsOnOpen set
200+ onClose = settingsOnClose set
201+
202+ withTimeoutManager f =
203+ case settingsManager set of
204+ Nothing -> bracket
205+ (T.initialize $ settingsTimeout set * 1000000)
206+ T.stopManager
207+ f
208+ Just tm -> f tm
209+
210+serveConnection :: T.Handle
329211 -> Settings
330− -> Application
331− -> 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)
342− 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
374−
375− where
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
421− 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
426−
427− dummyreq addr = defaultRequest { remoteHost = addr }
428−
429− errorResponse e = settingsOnExceptionResponse settings e
430−
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
450− -- Let the application run for as long as it wants
451− T.pause th
452−
453− -- In the event that some scarce resource was acquired during
454− -- creating the request, we need to make sure that we don't get
455− -- an async exception before calling the ResponseSource.
456− keepAliveRef <- newIORef $ error "keepAliveRef not filled"
457− r <- E.try $ app req $ \res -> do
458− T.resume th
459− -- FIXME consider forcing evaluation of the res here to
460− -- send more meaningful error messages to the user.
461− -- However, it may affect performance.
462− writeIORef istatus False
463− keepAlive <- sendResponse settings conn ii th req idxhdr (readSource src) res
464− writeIORef keepAliveRef keepAlive
465− 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−
475− keepAlive <- readIORef keepAliveRef
476−
477− -- We just send a Response and it takes a time to
478− -- 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
482− -- when this Haskell thread will be re-scheduled.
483− -- This improves performance at least when
484− -- the number of cores is small.
485− Conc.yield
486−
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
529−
530−flushEntireBody :: IO ByteString -> IO ()
531−flushEntireBody src =
532− loop
212+ -> InternalInfo
213+ -> Application -> Connection -> SockAddr-> IO ()
214+serveConnection timeoutHandle settings ii app conn remoteHost' =
215+ (serveConnection'' $ connSource conn th) `onException` send500
533216 where
534− loop = do
535− bs <- src
536− unless (S.null bs) loop
537−
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
217+ th = threadHandle ii
218+
219+ send500 = void $ mask $ \restore ->
220+ sendResponse settings ii dummyreq conn restore internalError
221+
222+ dummyreq = defaultRequest { remoteHost = remoteHost' }
223+
224+ internalError = responseLBS H.internalServerError500 [(H.hContentType, "text/plain")] "Something went wrong"
225+
226+ serveConnection'' fromClient = do
227+ (env, getSource) <- parseRequest conn timeoutHandle remoteHost' fromClient
228+ case settingsIntercept settings env of
229+ Nothing -> do
230+ -- Let the application run for as long as it wants
231+ liftIO $ T.pause th
232+
233+ -- In the event that some scarce resource was acquired during
234+ -- creating the request, we need to make sure that we don't get
235+ -- an async exception before calling the ResponseSource.
236+ keepAlive <- mask $ \restore -> do
237+ res <- restore $ app env
238+ liftIO $ T.resume th
239+ sendResponse settings ii env conn restore res
240+
241+ -- We just send a Response and it takes a time to
242+ -- receive a Request again. If we immediately call recv,
243+ -- it is likely to fail and the IO manager works.
244+ -- It is very costy. So, we yield to another Haskell
245+ -- thread hoping that the next Request will arraive
246+ -- when this Haskell thread will be re-scheduled.
247+ -- This improves performance at least when
248+ -- the number of cores is small.
249+ Conc.yield
250+ -- flush the rest of the request body
251+ requestBody env $$ CL.sinkNull
252+ ResumableSource fromClient' _ <- liftIO getSource
253+
254+ when keepAlive $ serveConnection'' fromClient'
255+ Just intercept -> do
256+ liftIO $ T.pause th
257+ ResumableSource fromClient' _ <- liftIO getSource
258+ intercept fromClient' conn
259+
260+connSource :: Connection -> T.Handle -> Source IO ByteString
261+connSource Connection { connRecv = recv } th = src
543262 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
555− bs <- recv
556− unless (S.null bs) $ do
557− writeIORef istatus True
558− when (S.length bs >= slowlorisSize) $ T.tickle th
559− return bs
263+ src = do
264+ bs <- liftIO recv
265+ unless (S.null bs) $ do
266+ when (S.length bs >= 2048) $ liftIO $ T.tickle th
267+ yield bs
268+ src
560269
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
572− return bs
573−
574−-- | Set flag FileCloseOnExec flag on a socket (on Unix)
575−--
576270-- Copied from: https://github.com/mzero/plush/blob/master/src/Plush/Server/Warp.hs
577−--
578−-- @since 3.2.17
579271setSocketCloseOnExec :: Socket -> IO ()
580272#if WINDOWS
581273setSocketCloseOnExec _ = return ()
582274#else
583−setSocketCloseOnExec socket = do
584−#if MIN_VERSION_network(3,0,0)
585− fd <- fdSocket socket
586−#else
587− let fd = fdSocket socket
275+setSocketCloseOnExec socket =
276+ setFdOption (fromIntegral $ fdSocket socket) CloseOnExec True
588277#endif
589− F.setFileCloseOnExec $ fromIntegral fd
590−#endif
591−
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