@@ -1,168 +1,120 @@
1−{-# LANGUAGE BangPatterns #-}
2{-# LANGUAGE CPP #-}
1{-# LANGUAGE CPP #-}
3{-# LANGUAGE OverloadedStrings #-}
2{-# LANGUAGE OverloadedStrings #-}
4−{-# LANGUAGE PackageImports #-}
5−{-# LANGUAGE PatternGuards #-}
6−{-# LANGUAGE RecordWildCards #-}
7{-# LANGUAGE ScopedTypeVariables #-}
3{-# LANGUAGE ScopedTypeVariables #-}
8−{-# LANGUAGE TupleSections #-}
9−{-# LANGUAGE ViewPatterns #-}
10{-# OPTIONS_GHC -fno-warn-deprecations #-}
4{-# OPTIONS_GHC -fno-warn-deprecations #-}
12module Network.Wai.Handler.Warp.Run where
6module Network.Wai.Handler.Warp.Run where
14−import "iproute" Data.IP (toHostAddress, toHostAddress6)
8+import Control.Concurrent (threadDelay, forkIOWithUnmask)
15−import Control.Arrow (first)
16import qualified Control.Concurrent as Conc (yield)
9import qualified Control.Concurrent as Conc (yield)
17import Control.Exception as E
10import Control.Exception as E
11+import Control.Monad (forever, when, unless, void)
12+import Control.Monad.IO.Class (liftIO)
13+import Data.ByteString (ByteString)
18import qualified Data.ByteString as S
14import qualified Data.ByteString as S
19−import Data.Char (chr)
15+import Data.Conduit
20−import Data.IORef (IORef, newIORef, readIORef, writeIORef)
16+import Data.Conduit.Internal (ResumableSource (..))
17+import qualified Data.Conduit.List as CL
18+#if MIN_VERSION_conduit(1,1,0)
21import Data.Streaming.Network (bindPortTCP)
19import Data.Streaming.Network (bindPortTCP)
22−import Foreign.C.Error (Errno(..), eCONNABORTED)
20+#else
23−import GHC.IO.Exception (IOException(..))
21+import Data.Conduit.Network (bindPort)
24−import qualified Network.HTTP2 as H2
22+#define bindPortTCP bindPort
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)
24+import Network (sClose, Socket)
25+import Network.Socket (accept, SockAddr)
29import qualified Network.Socket.ByteString as Sock
26import qualified Network.Socket.ByteString as Sock
30import Network.Wai
27import 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)
36−import Network.Wai.Handler.Warp.Buffer
37−import Network.Wai.Handler.Warp.Counter
38import qualified Network.Wai.Handler.Warp.Date as D
28import qualified Network.Wai.Handler.Warp.Date as D
39import qualified Network.Wai.Handler.Warp.FdCache as F
29import qualified Network.Wai.Handler.Warp.FdCache as F
40−import qualified Network.Wai.Handler.Warp.FileInfoCache as I
30+import Network.Wai.Handler.Warp.Buffer
41−import Network.Wai.Handler.Warp.HTTP2 (http2)
42−import Network.Wai.Handler.Warp.HTTP2.Types (isHTTP2)
43import Network.Wai.Handler.Warp.Header
31import Network.Wai.Handler.Warp.Header
44−import Network.Wai.Handler.Warp.Imports hiding (readInt)
45−import Network.Wai.Handler.Warp.ReadInt
46import Network.Wai.Handler.Warp.Recv
32import Network.Wai.Handler.Warp.Recv
47import Network.Wai.Handler.Warp.Request
33import Network.Wai.Handler.Warp.Request
48import Network.Wai.Handler.Warp.Response
34import Network.Wai.Handler.Warp.Response
49import Network.Wai.Handler.Warp.SendFile
35import Network.Wai.Handler.Warp.SendFile
50import Network.Wai.Handler.Warp.Settings
36import Network.Wai.Handler.Warp.Settings
37+import qualified Network.Wai.Handler.Warp.Timeout as T
51import Network.Wai.Handler.Warp.Types
38import Network.Wai.Handler.Warp.Types
52−
39+import Data.IORef (IORef, newIORef, readIORef, writeIORef)
54#if WINDOWS
41#if WINDOWS
55−import Network.Wai.Handler.Warp.Windows
42+import qualified Control.Concurrent.MVar as MV
43+import Network.Socket (withSocketsDo)
44+import Control.Concurrent (forkIO)
46+import System.Posix.IO (FdOption(CloseOnExec), setFdOption)
57import Network.Socket (fdSocket)
47import Network.Socket (fdSocket)
60−-- | Creating 'Connection' for plain HTTP based on a given socket.
50+-- | Default action value for 'Connection'.
61−socketConnection :: Settings -> Socket -> IO Connection
51+socketConnection :: Socket -> IO Connection
62−#if MIN_VERSION_network(3,1,1)
52+socketConnection s = do
63−socketConnection set s = do
53+ buf <- allocateBuffer bufferSize
65−socketConnection _ s = do
67− bufferPool <- newBufferPool
68− writeBuf <- allocateBuffer bufferSize
69− let sendall = Sock.sendAll s
70− isH2 <- newIORef False -- HTTP/1.x
71 return Connection {
54 return Connection {
72 connSendMany = Sock.sendMany s
55 connSendMany = Sock.sendMany s
73− , connSendAll = sendall
56+ , connSendAll = Sock.sendAll s
74− , connSendFile = sendFile s writeBuf bufferSize sendall
57+ , connSendFile = defaultSendFile s
75−#if MIN_VERSION_network(3,1,1)
58+ , connClose = sClose s >> freeBuffer buf
76− , connClose = do
59+ , connRecv = receive s buf bufferSize
77− h2 <- readIORef isH2
60+ , connBuffer = buf
78− let tm = if h2 then settingsGracefulCloseTimeout2 set
79− else settingsGracefulCloseTimeout1 set
83− gracefulClose s tm `E.catch` \(E.SomeException _) -> return ()
85− , connClose = close s
87− , connFree = freeBuffer writeBuf
88− , connRecv = receive s bufferPool
89− , connRecvBuf = receiveBuf s
90− , connWriteBuffer = writeBuf
91 , connBufferSize = bufferSize
61 , connBufferSize = bufferSize
92− , connHTTP2 = isH2
62+ , connSendFileOverride = Override s
95−-- | Run an 'Application' on the given port.
65+#if __GLASGOW_HASKELL__ < 702
96−-- This calls 'runSettings' with 'defaultSettings'.
66+allowInterrupt :: IO ()
67+allowInterrupt = unblock $ return ()
70+-- | Run an 'Application' on the given port. This calls 'runSettings' with
97run :: Port -> Application -> IO ()
72run :: Port -> Application -> IO ()
98run p = runSettings defaultSettings { settingsPort = p }
73run p = runSettings defaultSettings { settingsPort = p }
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'.
105−runEnv :: Port -> Application -> IO ()
107− mp <- lookupEnv "PORT"
109− maybe (run p app) runReadPort mp
112− runReadPort :: String -> IO ()
113− runReadPort sp = case reads sp of
114− ((p', _):_) -> run p' app
115− _ -> fail $ "Invalid value in $PORT: " ++ sp
117-- | Run an 'Application' with the given 'Settings'.
75-- | Run an 'Application' with the given 'Settings'.
118−-- This opens a listen socket on the port defined in 'Settings' and
119−-- calls 'runSettingsSocket'.
120runSettings :: Settings -> Application -> IO ()
76runSettings :: Settings -> Application -> IO ()
121−runSettings set app = withSocketsDo $
77+#if WINDOWS
78+runSettings set app = withSocketsDo $ do
79+ var <- MV.newMVar Nothing
80+ let clean = MV.modifyMVar_ var $ \s -> maybe (return ()) sClose s >> return Nothing
81+ void . forkIO $ bracket
82+ (bindPortTCP (settingsPort set) (settingsHost set))
85+ MV.modifyMVar_ var (\_ -> return $ Just s)
86+ runSettingsSocket set s app)
87+ forever (threadDelay maxBound) `finally` clean
123 (bindPortTCP (settingsPort set) (settingsHost set))
91 (bindPortTCP (settingsPort set) (settingsHost set))
125 (\socket -> do
93 (\socket -> do
126 setSocketCloseOnExec socket
94 setSocketCloseOnExec socket
127 runSettingsSocket set socket app)
95 runSettingsSocket set socket app)
129−-- | This installs a shutdown handler for the given socket and
98+-- | Same as 'runSettings', but uses a user-supplied socket instead of opening
130−-- calls 'runSettingsConnection' with the default connection setup action
99+-- one. This allows the user to provide, for example, Unix named socket, which
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.
135−-- The supplied socket can be a Unix named socket, which
136-- can be used when reverse HTTP proxying into your application.
100-- can be used when reverse HTTP proxying into your application.
138-- Note that the 'settingsPort' will still be passed to 'Application's via the
102-- Note that the 'settingsPort' will still be passed to 'Application's via the
139-- 'serverPort' record.
103-- 'serverPort' record.
140runSettingsSocket :: Settings -> Socket -> Application -> IO ()
104runSettingsSocket :: Settings -> Socket -> Application -> IO ()
141−runSettingsSocket set socket app = do
105+runSettingsSocket set socket app =
142− settingsInstallShutdownHandler set closeListenSocket
143 runSettingsConnection set getConn app
106 runSettingsConnection set getConn app
145 getConn = do
108 getConn = do
147− (s, sa) <- windowsThreadBlockHack $ accept socket
149 (s, sa) <- accept socket
109 (s, sa) <- accept socket
151 setSocketCloseOnExec s
110 setSocketCloseOnExec s
152− -- NoDelay causes an error for AF_UNIX.
111+ conn <- socketConnection s
153− setSocketOption s NoDelay 1 `E.catch` \(E.SomeException _) -> return ()
154− conn <- socketConnection set s
155 return (conn, sa)
112 return (conn, sa)
157− closeListenSocket = close socket
114+-- | Allows you to provide a function which will return a 'Connection'. In
158−
115+-- cases where creating the @Connection@ can be expensive, this allows the
159−-- | The connection setup action would be expensive. A good example
116+-- expensive computations to be performed in a separate thread instead of the
160−-- is initialization of TLS.
117+-- main server loop.
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.
167-- Since 1.3.5
119-- Since 1.3.5
168runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()
120runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()
@@ -172,428 +124,183 @@ runSettingsConnection set getConn app = runSettingsConnectionMaker set getConnMa
172 (conn, sa) <- getConn
124 (conn, sa) <- getConn
173 return (return conn, sa)
125 return (return conn, sa)
175−-- | This modifies the connection maker so that it returns 'TCP' for 'Transport'
127+-- | Allows you to provide a function which will return a function
176−-- (i.e. plain HTTP) then calls 'runSettingsConnectionMakerSecure'.
128+-- which will return 'Connection'.
177runSettingsConnectionMaker :: Settings -> IO (IO Connection, SockAddr) -> Application -> IO ()
129runSettingsConnectionMaker :: Settings -> IO (IO Connection, SockAddr) -> Application -> IO ()
178−runSettingsConnectionMaker x y =
130+runSettingsConnectionMaker set getConnMaker app = do
179− runSettingsConnectionMakerSecure x (toTCP <$> y)
181− toTCP = first ((, TCP) <$>)
183−----------------------------------------------------------------
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
191−runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Transport), SockAddr) -> Application -> IO ()
192−runSettingsConnectionMakerSecure set getConnMaker app = do
193 settingsBeforeMainLoop set
131 settingsBeforeMainLoop set
194− counter <- newCounter
195− withII $ acceptConnection set getConnMaker app counter
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
205− !fdCacheDurationInSeconds = settingsFdCacheDuration set * 1000000
133+ -- Note that there is a thorough discussion of the exception safety of the
206− !fdFileInfoDurationInSeconds = settingsFileInfoCacheDuration set * 1000000
134+ -- following code at: https://github.com/yesodweb/wai/issues/146
207− !timeoutInSeconds = settingsTimeout set * 1000000
208− withTimeoutManager f = case settingsManager set of
211− (T.initialize timeoutInSeconds)
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
218−-- We need to make sure of two things:
220−-- 1. Asynchronous exceptions are not blocked entirely in the main loop.
221−-- Doing so would make it impossible to kill the Warp thread.
223−-- 2. Once a connection maker is received via acceptNewConnection, the
224−-- connection is guaranteed to be closed, even in the presence of
227−-- Our approach is explained in the comments below.
228−acceptConnection :: Settings
229− -> IO (IO (Connection, Transport), SockAddr)
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.
239− -- acceptLoop can be broken by closing the listing socket.
136+ -- We need to make sure of two things:
240− void $ mask_ acceptLoop
137+ --
241− -- In some cases, we want to stop Warp here without graceful shutdown.
138+ -- 1. Asynchronous exceptions are not blocked entirely in the main loop.
242− -- So, async exceptions are allowed here.
139+ -- Doing so would make it impossible to kill the Warp thread.
243− -- That's why `finally` is not used.
140+ --
244− gracefulShutdown set counter
141+ -- 2. Once a connection maker is received via getConnLoop, the connection
245− where
142+ -- is guaranteed to be closed, even in the presence of async exceptions.
246− acceptLoop = do
143+ --
144+ -- Our approach is explained in the comments below.
146+ -- First mask all exceptions in the main loop. This is necessary to ensure
147+ -- that no async exception is throw between the call to getConnLoop and the
148+ -- registering of connClose.
149+ D.withDateCache $ \dc -> do
150+ F.withFdCache (settingsFdCacheDuration set * 1000000) $ \fc -> do
151+ withTimeoutManager $ \tm -> mask_ . forever $ do
247 -- Allow async exceptions before receiving the next connection maker.
152 -- Allow async exceptions before receiving the next connection maker.
248 allowInterrupt
153 allowInterrupt
250− -- acceptNewConnection will try to receive the next incoming
155+ -- getConnLoop will try to receive the next incoming request. It
251− -- request. It returns a /connection maker/, not a connection,
156+ -- returns a /connection maker/, not a connection, since in some
252− -- since in some circumstances creating a working connection
157+ -- circumstances creating a working connection from a raw socket may be
253− -- from a raw socket may be an expensive operation, and this
158+ -- an expensive operation, and this expensive work should not be
254− -- expensive work should not be performed in the main event
159+ -- performed in the main event loop. An example of something expensive
255− -- loop. An example of something expensive would be TLS
160+ -- would be TLS negotiation.
256− -- negotiation.
161+ (mkConn, addr) <- getConnLoop
257− mx <- acceptNewConnection
259− Nothing -> return ()
260− Just (mkConn, addr) -> do
261− fork set mkConn addr app counter ii
264− acceptNewConnection = do
163+ -- Fork a new worker thread for this connection maker, and ask for a
265− ex <- try getConnMaker
164+ -- function to unmask (i.e., allow async exceptions to be thrown).
267− Right x -> return $ Just x
269− let eConnAborted = getErrno eCONNABORTED
270− getErrno (Errno cInt) = cInt
271− if ioe_errno e == Just eConnAborted
272− then acceptNewConnection
274− settingsOnException set Nothing $ toException e
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).
280− -> IO (Connection, Transport)
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
297− -- We grab the connection before registering timeouts since the
166+ -- GHC 7.8 cannot infer the type of "void . forkIOWithUnmask"
298− -- timeouts will be useless during connection creation, due to the
167+ void $ forkIOWithUnmask $ \unmask ->
299− -- fact that async exceptions are still masked.
168+ -- Run the connection maker to get a new connection, and ensure
300− bracket mkConn cleanUp (serve unmask)
169+ -- that the connection is closed. If the mkConn call throws an
170+ -- exception, we will leak the connection. If the mkConn call is
171+ -- vulnerable to attacks (e.g., Slowloris), we do nothing to
172+ -- protect the server. It is therefore vital that mkConn is well
175+ -- We grab the connection before registering timeouts since the
176+ -- timeouts will be useless during connection creation, due to the
177+ -- fact that async exceptions are still masked.
178+ bracket mkConn connClose $ \conn' ->
180+ -- We need to register a timeout handler for this thread, and
181+ -- cancel that handler as soon as we exit.
182+ bracket (T.registerKillThread tm) T.cancel $ \th ->
183+ let ii = InternalInfo th fc dc
184+ conn = setSendFile conn' fc
185+ -- We now have fully registered a connection close handler
186+ -- in the case of all exceptions, so it is safe to one
187+ -- again allow async exceptions.
189+ -- Call the user-supplied on exception code if any
190+ -- exceptions are thrown.
191+ handle (onE Nothing) .
193+ -- Call the user-supplied code for connection open and close events
194+ bracket (onOpen addr) (const $ onClose addr) $ \goingon ->
196+ -- Actually serve this connection.
197+ -- onnClose above ensures the termination of the connection.
198+ when goingon $ serveConnection conn ii addr set app
302− cleanUp (conn, _) = connClose conn `finally` connFree conn
200+ -- FIXME: only IOEception is caught. What about other exceptions?
303−
201+ getConnLoop = getConnMaker `E.catch` \(e :: IOException) -> do
304− -- We need to register a timeout handler for this thread, and
202+ onE Nothing (toException e)
305− -- cancel that handler as soon as we exit.
203+ -- "resource exhausted (Too many open files)" may happen by accept().
306− serve unmask (conn, transport) = bracket register cancel $ \th -> do
204+ -- Wait a second hoping that resource will be available.
307− -- We now have fully registered a connection close handler in
205+ threadDelay 1000000
308− -- the case of all exceptions, so it is safe to once again
206+ getConnLoop
309− -- allow async exceptions.
207+ onE mreq e =
310− unmask .
208+ case fromException e of
311− -- Call the user-supplied code for connection open and
209+ Just (NotEnoughLines []) -> return ()
312− -- close events
210+ _ -> settingsOnException set mreq e
313− bracket (onOpen addr) (onClose addr) $ \goingon ->
211+ onOpen = settingsOnOpen set
314− -- Actually serve this connection. bracket with closeConn
212+ onClose = settingsOnClose set
315− -- above ensures the connection is closed.
213+
316− when goingon $ serveConnection conn ii th addr transport set app
214+ withTimeoutManager f =
317− where
215+ case settingsManager set of
318− register = T.registerKillThread (timeoutManager ii) (connClose conn)
216+ Nothing -> bracket
319− cancel = T.cancel
217+ (T.initialize $ settingsTimeout set * 1000000)
321− onOpen adr = increase counter >> settingsOnOpen set adr
219+ f
322− onClose adr _ = decrease counter >> settingsOnClose set adr
220+ Just tm -> f tm
324serveConnection :: Connection
222serveConnection :: Connection
325 -> InternalInfo
223 -> InternalInfo
327 -> SockAddr
224 -> SockAddr
329 -> Settings
225 -> Settings
330 -> Application
226 -> Application
332−serveConnection conn ii th origAddr transport settings app = do
228+serveConnection conn ii addr settings app = do
333− -- fixme: Upgrading to HTTP/2 should be supported.
334− (h2,bs) <- if isHTTP2 transport then
337− bs0 <- connRecv conn
338− if S.length bs0 >= 4 && "PRI " `S.isPrefixOf` bs0 then
342 istatus <- newIORef False
229 istatus <- newIORef False
343− if settingsHTTP2Enabled settings && h2 then do
230+ recvSendLoop istatus (connSource conn th istatus) `E.catch` \e -> do
344− rawRecvN <- makeReceiveN bs (connRecv conn) (connRecvBuf conn)
231+ sendErrorResponse istatus e
345− -- This thread becomes the sender in http2 library.
232+ throwIO (e :: SomeException)
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
356− setConnHTTP2 conn True
357− http2 conn transport ii origAddr settings recvN sendBS app
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 ->
366− -- See comment below referencing
367− -- https://github.com/yesodweb/wai/issues/618
368− | Just NoKeepAliveRequest <- fromException e -> return ()
370− | Just (BadFirstLine _) <- fromException e -> return ()
372− _ <- sendErrorResponse (dummyreq addr) istatus e
376− getProxyProtocolAddr src =
235+ th = threadHandle ii
377− case settingsProxyProtocol settings of
378− ProxyProtocolNone ->
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
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)
398− ["PROXY","TCP6",clientAddr,_,clientPort,_] ->
399− case [x | (x, t) <- reads (decodeAscii clientAddr), null t] of
400− [a] -> Just (SockAddrInet6 (readInt clientPort)
405− ("PROXY":"UNKNOWN":_) ->
410− Nothing -> throwIO (BadProxyHeader (decodeAscii header))
411− Just a -> do leftoverSource src (S.drop 2 seg') -- drop CRLF
414− decodeAscii = map (chr . fromEnum) . S.unpack
416− shouldSendErrorResponse se
417− | Just ConnectionClosedByPeer <- fromException se = False
420− sendErrorResponse req istatus e = do
237+ sendErrorResponse istatus e = do
421 status <- readIORef istatus
238 status <- readIORef istatus
422− if shouldSendErrorResponse e && status
239+ when status $ void $ mask $ \restore ->
423− then do
240+ sendResponse conn ii restore dummyreq defaultIndexRequestHeader Nothing (errorResponse e)
424− sendResponse settings conn ii th req defaultIndexRequestHeader (return S.empty) (errorResponse e)
427− dummyreq addr = defaultRequest { remoteHost = addr }
242+ dummyreq = defaultRequest { remoteHost = addr }
429 errorResponse e = settingsOnExceptionResponse settings e
244 errorResponse e = settingsOnExceptionResponse settings e
431− http1 firstRequest addr istatus src = do
246+ recvSendLoop istatus fromClient = do
432− (req, mremainingRef, idxhdr, nextBodyFlush) <- recvRequest firstRequest settings conn ii th addr src transport
247+ (req, idxhdr, getSource, leftover') <- recvRequest settings conn ii addr fromClient
433− keepAlive <- processRequest istatus src req mremainingRef idxhdr nextBodyFlush
248+ intercept' <- settingsIntercept settings req
434− `E.catch` \e -> do
249+ case intercept' of
435− settingsOnException settings (Just req) e
250+ Nothing -> do
436− -- Don't throw the error again to prevent calling settingsOnException twice.
251+ -- Let the application run for as long as it wants
437− return False
252+ T.pause th
439− -- When doing a keep-alive connection, the other side may just
254+ -- In the event that some scarce resource was acquired during
440− -- close the connection. We don't want to treat that as an
255+ -- creating the request, we need to make sure that we don't get
441− -- exceptional situation, so we pass in False to http1 (which
256+ -- an async exception before calling the ResponseSource.
442− -- in turn passes in False to recvRequest), indicating that
257+ keepAlive <- mask $ \restore -> do
443− -- this is not the first request. If, when trying to read the
258+ res <- restore $ app req
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
449− processRequest istatus src req mremainingRef idxhdr nextBodyFlush = do
450− -- Let the application run for as long as it wants
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
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
467− Right ResponseReceived -> return ()
468− Left e@(SomeException _)
469− | Just (ExceptionInsideResponseBody e') <- fromException e -> throwIO e'
471− keepAlive <- sendErrorResponse req istatus e
472− settingsOnException settings (Just req) e
473− writeIORef keepAliveRef keepAlive
475− keepAlive <- readIORef keepAliveRef
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.
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
494− flushEntireBody nextBodyFlush
495 T.resume th
259 T.resume th
496− return True
260+ -- FIXME consider forcing evaluation of the res here to
497− Just maxToRead -> do
261+ -- send more meaningful error messages to the user.
498− let tryKeepAlive = do
262+ -- However, it may affect performance.
499− -- flush the rest of the request body
263+ writeIORef istatus False
500− isComplete <- flushBody nextBodyFlush maxToRead
264+ sendResponse conn ii restore req idxhdr leftover' res
501− if isComplete then do
265+
502− T.resume th
266+ -- We just send a Response and it takes a time to
503− return True
267+ -- receive a Request again. If we immediately call recv,
504− else
268+ -- it is likely to fail and the IO manager works.
505− return False
269+ -- It is very costy. So, we yield to another Haskell
506− case mremainingRef of
270+ -- thread hoping that the next Request will arraive
507− Just ref -> do
271+ -- when this Haskell thread will be re-scheduled.
508− remaining <- readIORef ref
272+ -- This improves performance at least when
509− if remaining <= maxToRead then
273+ -- the number of cores is small.
510− tryKeepAlive
274+ Conc.yield
512− return False
276+ when keepAlive $ do
513− Nothing -> tryKeepAlive
277+ -- flush the rest of the request body
514− else
278+ requestBody req $$ CL.sinkNull
515− return False
279+ ResumableSource fromClient' _ <- getSource
517− checkTLS = case transport of
281+ recvSendLoop istatus fromClient'
518− TCP -> return () -- direct
282+ Just intercept -> do
519− tls -> unless (tls12orLater tls) $ goaway conn H2.InadequateSecurity "Weak TLS"
283+ T.pause th
520− tls12orLater tls = tlsMajorVersion tls == 3 && tlsMinorVersion tls >= 3
284+ ResumableSource fromClient' _ <- getSource
521−
285+ intercept fromClient' conn
522−-- connClose must not be called here since Run:fork calls it
286+
523−goaway :: Connection -> H2.ErrorCodeId -> ByteString -> IO ()
287+connSource :: Connection -> T.Handle -> IORef Bool -> Source IO ByteString
524−goaway Connection{..} etype debugmsg = connSendAll bytestream
288+connSource Connection { connRecv = recv } th istatus = src
526− einfo = H2.encodeInfo id 0
527− frame = H2.GoAwayFrame 0 etype debugmsg
528− bytestream = H2.encodeFrame einfo frame
530−flushEntireBody :: IO ByteString -> IO ()
531−flushEntireBody src =
536− unless (S.null bs) loop
538−flushBody :: IO ByteString -- ^ get next chunk
539− -> Int -- ^ maximum to flush
540− -> IO Bool -- ^ True == flushed the entire body, False == we didn't
544− loop toRead = do
290+ src = do
545− bs <- src
291+ bs <- liftIO recv
546− let toRead' = toRead - S.length bs
292+ unless (S.null bs) $ do
547− case () of
293+ liftIO $ do
548− ()
294+ writeIORef istatus True
549− | S.null bs -> return True
295+ when (S.length bs >= 2048) $ T.tickle th
550− | toRead' >= 0 -> loop toRead'
296+ yield bs
551− | otherwise -> return False
297+ src
553−wrappedRecv :: Connection -> T.Handle -> IORef Bool -> Int -> IO ByteString
554−wrappedRecv Connection { connRecv = recv } th istatus slowlorisSize = do
556− unless (S.null bs) $ do
557− writeIORef istatus True
558− when (S.length bs >= slowlorisSize) $ T.tickle th
561−wrappedRecvN :: T.Handle -> IORef Bool -> Int -> (BufSize -> IO ByteString) -> (BufSize -> IO ByteString)
562−wrappedRecvN th istatus slowlorisSize readN bufsize = do
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
574−-- | Set flag FileCloseOnExec flag on a socket (on Unix)
576-- Copied from: https://github.com/mzero/plush/blob/master/src/Plush/Server/Warp.hs
299-- Copied from: https://github.com/mzero/plush/blob/master/src/Plush/Server/Warp.hs
579setSocketCloseOnExec :: Socket -> IO ()
300setSocketCloseOnExec :: Socket -> IO ()
580#if WINDOWS
301#if WINDOWS
581setSocketCloseOnExec _ = return ()
302setSocketCloseOnExec _ = return ()
583−setSocketCloseOnExec socket = do
304+setSocketCloseOnExec socket =
584−#if MIN_VERSION_network(3,0,0)
305+ setFdOption (fromIntegral $ fdSocket socket) CloseOnExec True
585− fd <- fdSocket socket
587− let fd = fdSocket socket
589− F.setFileCloseOnExec $ fromIntegral fd
592−gracefulShutdown :: Settings -> Counter -> IO ()
593−gracefulShutdown set counter =
594− case settingsGracefulShutdownTimeout set of
598− void (timeout (seconds * microsPerSecond) (waitForZero counter))
599− where microsPerSecond = 1000000