@@ -1,122 +1,170 @@
1+{-# LANGUAGE BangPatterns #-}
1{-# LANGUAGE CPP #-}
2{-# LANGUAGE CPP #-}
3+{-# LANGUAGE OverloadedStrings #-}
4+{-# LANGUAGE PackageImports #-}
5+{-# LANGUAGE PatternGuards #-}
6+{-# LANGUAGE RecordWildCards #-}
2{-# LANGUAGE ScopedTypeVariables #-}
7{-# LANGUAGE ScopedTypeVariables #-}
8+{-# LANGUAGE TupleSections #-}
9+{-# LANGUAGE ViewPatterns #-}
10+{-# OPTIONS_GHC -fno-warn-deprecations #-}
4module Network.Wai.Handler.Warp.Run where
12module Network.Wai.Handler.Warp.Run where
6−import Control.Concurrent (threadDelay, forkIOWithUnmask)
14+import "iproute" Data.IP (toHostAddress, toHostAddress6)
15+import Control.Arrow (first)
7import qualified Control.Concurrent as Conc (yield)
16import qualified Control.Concurrent as Conc (yield)
8import Control.Exception as E
17import Control.Exception as E
9−import Control.Monad (forever, when, unless, void)
10−import Control.Monad.IO.Class (MonadIO, liftIO)
11−import Data.ByteString (ByteString)
12import qualified Data.ByteString as S
18import qualified Data.ByteString as S
13−import Data.Conduit
19+import Data.Char (chr)
14−import Data.Conduit.Internal (ResumableSource (..))
20+import Data.IORef (IORef, newIORef, readIORef, writeIORef)
15−import qualified Data.Conduit.List as CL
21+import Data.Streaming.Network (bindPortTCP)
16−import Data.Conduit.Network (bindPort)
22+import Foreign.C.Error (Errno(..), eCONNABORTED)
17−import Network (sClose, Socket)
23+import GHC.IO.Exception (IOException(..))
18−import Network.Sendfile
24+import qualified Network.HTTP2 as H2
19−import Network.Socket (accept, SockAddr)
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)
20import qualified Network.Socket.ByteString as Sock
29import qualified Network.Socket.ByteString as Sock
21import Network.Wai
30import 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
38+import qualified Network.Wai.Handler.Warp.Date as D
39+import 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
46+import Network.Wai.Handler.Warp.Recv
22import Network.Wai.Handler.Warp.Request
47import Network.Wai.Handler.Warp.Request
23import Network.Wai.Handler.Warp.Response
48import Network.Wai.Handler.Warp.Response
49+import Network.Wai.Handler.Warp.SendFile
24import Network.Wai.Handler.Warp.Settings
50import Network.Wai.Handler.Warp.Settings
25−import qualified Network.Wai.Handler.Warp.Timeout as T
26import Network.Wai.Handler.Warp.Types
51import Network.Wai.Handler.Warp.Types
27−import Network.Wai.Handler.Warp.Recv
52+
29#if WINDOWS
54#if WINDOWS
30−import qualified Control.Concurrent.MVar as MV
55+import Network.Wai.Handler.Warp.Windows
31−import Network.Socket (withSocketsDo)
32−import Control.Concurrent (forkIO)
34−import System.Posix.IO (FdOption(CloseOnExec), setFdOption)
35import Network.Socket (fdSocket)
57import Network.Socket (fdSocket)
38−#if SENDFILEFD
60+-- | Creating 'Connection' for plain HTTP based on a given socket.
39−import Control.Applicative
61+socketConnection :: Settings -> Socket -> IO Connection
40−import qualified Network.Wai.Handler.Warp.FdCache as F
62+#if MIN_VERSION_network(3,1,1)
63+socketConnection set s = do
65+socketConnection _ s = do
42−
67+ bufferPool <- newBufferPool
43−-- FIXME come up with good values here
68+ writeBuf <- allocateBuffer bufferSize
44−bytesPerRead :: Int
69+ let sendall = Sock.sendAll s
45−bytesPerRead = 4096
70+ isH2 <- newIORef False -- HTTP/1.x
47−-- | Default action value for 'Connection'
48−socketConnection :: Socket -> IO Connection
49−socketConnection s = do
50− buf <- allocateRecvBuffer bytesPerRead
51 return Connection {
71 return Connection {
52 connSendMany = Sock.sendMany s
72 connSendMany = Sock.sendMany s
53− , connSendAll = Sock.sendAll s
73+ , connSendAll = sendall
54− , connSendFile = sendFile s
74+ , connSendFile = sendFile s writeBuf bufferSize sendall
55− , connClose = sClose s >> freeRecvBuffer buf
75+#if MIN_VERSION_network(3,1,1)
56− , connRecv = receive s buf bytesPerRead
76+ , connClose = do
57− }
77+ h2 <- readIORef isH2
58−
78+ let tm = if h2 then settingsGracefulCloseTimeout2 set
59−sendFile :: Socket -> FilePath -> Integer -> Integer -> IO () -> [ByteString] -> Cleaner -> IO ()
79+ else settingsGracefulCloseTimeout1 set
60−#if SENDFILEFD
80+ if tm == 0 then
61−sendFile s path off len act hdr cleaner = case fdCacher cleaner of
81+ close s
62− Nothing -> sendfileWithHeader s path (PartOfFile off len) act hdr
82+ else
63− Just fdc -> do
83+ gracefulClose s tm `E.catch` \(E.SomeException _) -> return ()
64− (fd, fresher) <- F.getFd fdc path
65− sendfileFdWithHeader s fd (PartOfFile off len) (act>>fresher) hdr
67−sendFile s path off len act hdr _ =
85+ , connClose = close s
68− sendfileWithHeader s path (PartOfFile off len) act hdr
71−#if __GLASGOW_HASKELL__ < 702
72−allowInterrupt :: IO ()
73−allowInterrupt = unblock $ return ()
87+ , connFree = freeBuffer writeBuf
88+ , connRecv = receive s bufferPool
89+ , connRecvBuf = receiveBuf s
90+ , connWriteBuffer = writeBuf
91+ , connBufferSize = bufferSize
76−-- | Run an 'Application' on the given port. This calls 'runSettings' with
95+-- | Run an 'Application' on the given port.
77−-- 'defaultSettings'.
96+-- This calls 'runSettings' with 'defaultSettings'.
78run :: Port -> Application -> IO ()
97run :: Port -> Application -> IO ()
79run p = runSettings defaultSettings { settingsPort = p }
98run p = runSettings defaultSettings { settingsPort = p }
81−-- | Run a Warp server with the given settings.
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'.
118+-- This opens a listen socket on the port defined in 'Settings' and
119+-- calls 'runSettingsSocket'.
82runSettings :: Settings -> Application -> IO ()
120runSettings :: Settings -> Application -> IO ()
83−#if WINDOWS
121+runSettings set app = withSocketsDo $
84−runSettings set app = withSocketsDo $ do
85− var <- MV.newMVar Nothing
86− let clean = MV.modifyMVar_ var $ \s -> maybe (return ()) sClose s >> return Nothing
87− void . forkIO $ bracket
88− (bindPort (settingsPort set) (settingsHost set))
91− MV.modifyMVar_ var (\_ -> return $ Just s)
92− runSettingsSocket set s app)
93− forever (threadDelay maxBound) `finally` clean
97− (bindPort (settingsPort set) (settingsHost set))
123+ (bindPortTCP (settingsPort set) (settingsHost set))
99 (\socket -> do
125 (\socket -> do
100 setSocketCloseOnExec socket
126 setSocketCloseOnExec socket
101 runSettingsSocket set socket app)
127 runSettingsSocket set socket app)
104−-- | Same as 'runSettings', but uses a user-supplied socket instead of opening
129+-- | This installs a shutdown handler for the given socket and
105−-- one. This allows the user to provide, for example, Unix named socket, which
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.
135+-- The supplied socket can be a Unix named socket, which
106-- can be used when reverse HTTP proxying into your application.
136-- can be used when reverse HTTP proxying into your application.
108-- Note that the 'settingsPort' will still be passed to 'Application's via the
138-- Note that the 'settingsPort' will still be passed to 'Application's via the
109-- 'serverPort' record.
139-- 'serverPort' record.
110runSettingsSocket :: Settings -> Socket -> Application -> IO ()
140runSettingsSocket :: Settings -> Socket -> Application -> IO ()
111−runSettingsSocket set socket app =
141+runSettingsSocket set socket app = do
142+ settingsInstallShutdownHandler set closeListenSocket
112 runSettingsConnection set getConn app
143 runSettingsConnection set getConn app
114 getConn = do
145 getConn = do
147+ (s, sa) <- windowsThreadBlockHack $ accept socket
115 (s, sa) <- accept socket
149 (s, sa) <- accept socket
116− setSocketCloseOnExec socket
150+#endif
117− conn <- socketConnection s
151+ 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
118 return (conn, sa)
155 return (conn, sa)
157+ closeListenSocket = close socket
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.
120runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()
168runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()
121runSettingsConnection set getConn app = runSettingsConnectionMaker set getConnMaker app
169runSettingsConnection set getConn app = runSettingsConnectionMaker set getConnMaker app
@@ -124,166 +172,428 @@ runSettingsConnection set getConn app = runSettingsConnectionMaker set getConnMa
124 (conn, sa) <- getConn
172 (conn, sa) <- getConn
125 return (return conn, sa)
173 return (return conn, sa)
127−-- | Allows you to provide a function which will return a @Connection@. In
175+-- | This modifies the connection maker so that it returns 'TCP' for 'Transport'
128−-- cases where creating the @Connection@ can be expensive, this allows the
176+-- (i.e. plain HTTP) then calls 'runSettingsConnectionMakerSecure'.
129−-- expensive computations to be performed in a separate thread instead of the
133runSettingsConnectionMaker :: Settings -> IO (IO Connection, SockAddr) -> Application -> IO ()
177runSettingsConnectionMaker :: Settings -> IO (IO Connection, SockAddr) -> Application -> IO ()
134−runSettingsConnectionMaker set getConn app = do
178+runSettingsConnectionMaker x y =
135−#if SENDFILEFD
179+ runSettingsConnectionMakerSecure x (toTCP <$> y)
136− let duration = settingsFdCacheDuration set
180+ where
137− fc <- case duration of
181+ toTCP = first ((, TCP) <$>)
138− 0 -> return Nothing
182+
139− _ -> Just <$> F.initialize (duration * 1000000)
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
141 settingsBeforeMainLoop set
193 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
143− -- Note that there is a thorough discussion of the exception safety of the
205+ !fdCacheDurationInSeconds = settingsFdCacheDuration set * 1000000
144− -- following code at: https://github.com/yesodweb/wai/issues/146
206+ !fdFileInfoDurationInSeconds = settingsFileInfoCacheDuration set * 1000000
145− --
207+ !timeoutInSeconds = settingsTimeout set * 1000000
146− -- We need to make sure of two things:
208+ withTimeoutManager f = case settingsManager set of
147− --
209+ Just tm -> f tm
148− -- 1. Asynchronous exceptions are not blocked entirely in the main loop.
210+ Nothing -> bracket
149− -- Doing so would make it impossible to kill the Warp thread.
211+ (T.initialize timeoutInSeconds)
150− --
212+ T.stopManager
151− -- 2. Once a connection maker is received via getConnLoop, the connection
213+ f
152− -- is guaranteed to be closed, even in the presence of async exceptions.
154− -- Our approach is explained in the comments below.
156− -- First mask all exceptions in the main loop. This is necessary to ensure
215+-- Note that there is a thorough discussion of the exception safety of the
157− -- that no async exception is throw between the call to getConnLoop and the
216+-- following code at: https://github.com/yesodweb/wai/issues/146
158− -- registering of connClose.
217+--
159− withTimeoutManager $ \tm -> mask_ . forever $ do
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.
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
160 -- Allow async exceptions before receiving the next connection maker.
247 -- Allow async exceptions before receiving the next connection maker.
161 allowInterrupt
248 allowInterrupt
163− -- getConnLoop will try to receive the next incoming request. It
250+ -- acceptNewConnection will try to receive the next incoming
164− -- returns a /connection maker/, not a connection, since in some
251+ -- request. It returns a /connection maker/, not a connection,
165− -- circumstances creating a working connection from a raw socket may be
252+ -- since in some circumstances creating a working connection
166− -- an expensive operation, and this expensive work should not be
253+ -- from a raw socket may be an expensive operation, and this
167− -- performed in the main event loop. An example of something expensive
254+ -- expensive work should not be performed in the main event
168− -- would be TLS negotiation.
255+ -- loop. An example of something expensive would be TLS
169− (mkConn, addr) <- getConnLoop
256+ -- negotiation.
257+ mx <- acceptNewConnection
259+ Nothing -> return ()
260+ Just (mkConn, addr) -> do
261+ fork set mkConn addr app counter ii
264+ acceptNewConnection = do
265+ ex <- try getConnMaker
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
171− -- Fork a new worker thread for this connection maker, and ask for a
277+-- Fork a new worker thread for this connection maker, and ask for a
172− -- function to unmask (i.e., allow async exceptions to be thrown).
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
174− -- GHC 7.8 cannot infer the type of "void . forkIOWithUnmask"
297+ -- We grab the connection before registering timeouts since the
175− void $ forkIOWithUnmask $ \unmask ->
298+ -- timeouts will be useless during connection creation, due to the
176− -- Run the connection maker to get a new connection, and ensure
299+ -- fact that async exceptions are still masked.
177− -- that the connection is closed. If the mkConn call throws an
300+ bracket mkConn cleanUp (serve unmask)
178− -- exception, we will leak the connection. If the mkConn call is
179− -- vulnerable to attacks (e.g., Slowloris), we do nothing to
180− -- protect the server. It is therefore vital that mkConn is well
183− -- We grab the connection before registering timeouts since the
184− -- timeouts will be useless during connection creation, due to the
185− -- fact that async exceptions are still masked.
186− bracket mkConn connClose $ \conn ->
188− -- We need to register a timeout handler for this thread, and
189− -- cancel that handler as soon as we exit.
190− bracket (T.registerKillThread tm) T.cancel $ \th ->
192− let cleaner = Cleaner th fc
194− let cleaner = Cleaner th
196− -- We now have fully registered a connection close handler
197− -- in the case of all exceptions, so it is safe to one
198− -- again allow async exceptions.
200− -- Call the user-supplied on exception code if any
201− -- exceptions are thrown.
202− handle (onE Nothing) .
204− -- Call the user-supplied code for connection open and close events
205− bracket_ onOpen onClose $
207− -- Actually serve this connection.
208− serveConnection th set cleaner app conn addr
210− -- FIXME: only IOEception is caught. What about other exceptions?
302+ cleanUp (conn, _) = connClose conn `finally` connFree conn
211− getConnLoop = getConn `E.catch` \(e :: IOException) -> do
303+
212− onE Nothing (toException e)
304+ -- We need to register a timeout handler for this thread, and
213− -- "resource exhausted (Too many open files)" may happen by accept().
305+ -- cancel that handler as soon as we exit.
214− -- Wait a second hoping that resource will be available.
306+ serve unmask (conn, transport) = bracket register cancel $ \th -> do
215− threadDelay 1000000
307+ -- We now have fully registered a connection close handler in
216− getConnLoop
308+ -- the case of all exceptions, so it is safe to once again
217− onE = settingsOnException set
309+ -- allow async exceptions.
218− onOpen = settingsOnOpen set
310+ unmask .
219− onClose = settingsOnClose set
311+ -- Call the user-supplied code for connection open and
221− withTimeoutManager f =
313+ bracket (onOpen addr) (onClose addr) $ \goingon ->
222− case settingsManager set of
314+ -- Actually serve this connection. bracket with closeConn
223− Nothing -> bracket
315+ -- above ensures the connection is closed.
224− (T.initialize $ settingsTimeout set * 1000000)
316+ when goingon $ serveConnection conn ii th addr transport set app
225− T.stopManager
317+ where
226− f
318+ register = T.registerKillThread (timeoutManager ii) (connClose conn)
227− Just tm -> f tm
319+ cancel = T.cancel
229−serveConnection :: T.Handle
321+ onOpen adr = increase counter >> settingsOnOpen set adr
322+ onClose adr _ = decrease counter >> settingsOnClose set adr
324+serveConnection :: Connection
230 -> Settings
329 -> Settings
231− -> Cleaner
330+ -> Application
232− -> Application -> Connection -> SockAddr-> IO ()
331+ -> IO ()
233−serveConnection timeoutHandle settings cleaner app conn remoteHost' =
332+serveConnection conn ii th origAddr transport settings app = do
234− serveConnection'' $ connSource conn th
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
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
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 =
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
421+ status <- readIORef istatus
422+ if shouldSendErrorResponse e && status
424+ sendResponse settings conn ii th req defaultIndexRequestHeader (return S.empty) (errorResponse e)
427+ dummyreq addr = defaultRequest { remoteHost = addr }
429+ errorResponse e = settingsOnExceptionResponse settings e
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
435+ settingsOnException settings (Just req) e
436+ -- Don't throw the error again to prevent calling settingsOnException twice.
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
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
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
506+ case mremainingRef of
508+ remaining <- readIORef ref
509+ if remaining <= maxToRead then
513+ Nothing -> tryKeepAlive
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
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
236− th = threadHandle cleaner
526+ einfo = H2.encodeInfo id 0
237−
527+ frame = H2.GoAwayFrame 0 etype debugmsg
238− serveConnection'' fromClient = do
528+ bytestream = H2.encodeFrame einfo frame
239− (env, getSource) <- parseRequest conn timeoutHandle remoteHost' fromClient
529+
240− case settingsIntercept settings env of
530+flushEntireBody :: IO ByteString -> IO ()
241− Nothing -> do
531+flushEntireBody src =
242− -- Let the application run for as long as it wants
532+ loop
243− liftIO $ T.pause th
533+ where
245− -- In the event that some scarce resource was acquired during
535+ bs <- src
246− -- creating the request, we need to make sure that we don't get
536+ unless (S.null bs) loop
247− -- an async exception before calling the ResponseSource.
537+
248− keepAlive <- mask $ \restore -> do
538+flushBody :: IO ByteString -- ^ get next chunk
249− res <- restore $ app env
539+ -> Int -- ^ maximum to flush
250− liftIO $ T.resume th
540+ -> IO Bool -- ^ True == flushed the entire body, False == we didn't
251− sendResponse settings cleaner env conn restore res
541+flushBody src =
253− -- | We just send a Response and it takes a time to
254− -- receive a Request again. If we immediately call recv,
255− -- it is likely to fail and the IO manager works.
256− -- It is very costy. So, we yield to another Haskell
257− -- thread hoping that the next Request will arraive
258− -- when this Haskell thread will be re-scheduled.
259− -- This improves performance at least when
260− -- the number of cores is small.
262− -- flush the rest of the request body
263− requestBody env $$ CL.sinkNull
264− ResumableSource fromClient' _ <- liftIO getSource
266− when keepAlive $ serveConnection'' fromClient'
267− Just intercept -> do
269− ResumableSource fromClient' _ <- liftIO getSource
270− intercept fromClient' conn
272−connSource :: Connection -> T.Handle -> Source IO ByteString
273−connSource Connection { connRecv = recv } th = src
275− src = do
544+ loop toRead = do
276− bs <- liftIO recv
545+ bs <- src
277− unless (S.null bs) $ do
546+ let toRead' = toRead - S.length bs
278− when (S.length bs >= 2048) $ liftIO $ T.tickle th
547+ case () of
280− src
549+ | S.null bs -> return True
550+ | toRead' >= 0 -> loop toRead'
551+ | otherwise -> return False
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)
282-- Copied from: https://github.com/mzero/plush/blob/master/src/Plush/Server/Warp.hs
576-- Copied from: https://github.com/mzero/plush/blob/master/src/Plush/Server/Warp.hs
283setSocketCloseOnExec :: Socket -> IO ()
579setSocketCloseOnExec :: Socket -> IO ()
284#if WINDOWS
580#if WINDOWS
285setSocketCloseOnExec _ = return ()
581setSocketCloseOnExec _ = return ()
287−setSocketCloseOnExec socket =
583+setSocketCloseOnExec socket = do
288− setFdOption (fromIntegral $ fdSocket socket) CloseOnExec True
584+#if MIN_VERSION_network(3,0,0)
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