@@ -1,88 +1,145 @@
1+{-# LANGUAGE BangPatterns #-}
1{-# LANGUAGE CPP #-}
2{-# LANGUAGE CPP #-}
2{-# LANGUAGE OverloadedStrings #-}
3{-# LANGUAGE OverloadedStrings #-}
4+{-# LANGUAGE PackageImports #-}
5+{-# LANGUAGE PatternGuards #-}
6+{-# LANGUAGE RecordWildCards #-}
3{-# LANGUAGE ScopedTypeVariables #-}
7{-# LANGUAGE ScopedTypeVariables #-}
4{-# LANGUAGE TupleSections #-}
8{-# LANGUAGE TupleSections #-}
9+{-# LANGUAGE ViewPatterns #-}
5{-# OPTIONS_GHC -fno-warn-deprecations #-}
10{-# OPTIONS_GHC -fno-warn-deprecations #-}
7module Network.Wai.Handler.Warp.Run where
12module Network.Wai.Handler.Warp.Run where
9−import Control.Concurrent (threadDelay, forkIOWithUnmask)
14+import "iproute" Data.IP (toHostAddress, toHostAddress6)
15+import Control.Arrow (first)
10import qualified Control.Concurrent as Conc (yield)
16import qualified Control.Concurrent as Conc (yield)
11import Control.Exception as E
17import Control.Exception as E
12−import Control.Monad (forever, when, unless, void)
13−import Data.ByteString (ByteString)
14import qualified Data.ByteString as S
18import qualified Data.ByteString as S
19+import Data.Char (chr)
20+import Data.IORef (IORef, newIORef, readIORef, writeIORef)
15import Data.Streaming.Network (bindPortTCP)
21import Data.Streaming.Network (bindPortTCP)
16−import Network (sClose, Socket)
22+import Foreign.C.Error (Errno(..), eCONNABORTED)
23+import GHC.IO.Exception (IOException(..))
24+import qualified Network.HTTP2 as H2
17−import Network.Socket (accept, withSocketsDo, 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)
18import qualified Network.Socket.ByteString as Sock
29import qualified Network.Socket.ByteString as Sock
19import Network.Wai
30import Network.Wai
20import Network.Wai.Internal (ResponseReceived (ResponseReceived))
31import 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
21import qualified Network.Wai.Handler.Warp.Date as D
38import qualified Network.Wai.Handler.Warp.Date as D
22import qualified Network.Wai.Handler.Warp.FdCache as F
39import 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)
23−import Network.Wai.Handler.Warp.Buffer
42+import Network.Wai.Handler.Warp.HTTP2.Types (isHTTP2)
24import Network.Wai.Handler.Warp.Header
43import Network.Wai.Handler.Warp.Header
44+import Network.Wai.Handler.Warp.Imports hiding (readInt)
45+import Network.Wai.Handler.Warp.ReadInt
25import Network.Wai.Handler.Warp.Recv
46import Network.Wai.Handler.Warp.Recv
26import Network.Wai.Handler.Warp.Request
47import Network.Wai.Handler.Warp.Request
27import Network.Wai.Handler.Warp.Response
48import Network.Wai.Handler.Warp.Response
28import Network.Wai.Handler.Warp.SendFile
49import Network.Wai.Handler.Warp.SendFile
29import Network.Wai.Handler.Warp.Settings
50import Network.Wai.Handler.Warp.Settings
30−import qualified Network.Wai.Handler.Warp.Timeout as T
31import Network.Wai.Handler.Warp.Types
51import Network.Wai.Handler.Warp.Types
32−import Data.IORef (IORef, newIORef, readIORef, writeIORef)
52+
34#if WINDOWS
54#if WINDOWS
35import Network.Wai.Handler.Warp.Windows
55import Network.Wai.Handler.Warp.Windows
37−import System.Posix.IO (FdOption(CloseOnExec), setFdOption)
38import Network.Socket (fdSocket)
57import Network.Socket (fdSocket)
41−-- | Default action value for 'Connection'.
60+-- | Creating 'Connection' for plain HTTP based on a given socket.
42−socketConnection :: Socket -> IO Connection
61+socketConnection :: Settings -> Socket -> IO Connection
62+#if MIN_VERSION_network(3,1,1)
63+socketConnection set s = do
43−socketConnection s = do
65+socketConnection _ s = do
44− readBuf <- allocateBuffer bufferSize
66+#endif
67+ bufferPool <- newBufferPool
45 writeBuf <- allocateBuffer bufferSize
68 writeBuf <- allocateBuffer bufferSize
69+ let sendall = Sock.sendAll s
70+ isH2 <- newIORef False -- HTTP/1.x
46 return Connection {
71 return Connection {
47 connSendMany = Sock.sendMany s
72 connSendMany = Sock.sendMany s
48− , connSendAll = Sock.sendAll s
73+ , connSendAll = sendall
49− , connSendFile = defaultSendFile s
74+ , connSendFile = sendFile s writeBuf bufferSize sendall
75+#if MIN_VERSION_network(3,1,1)
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
50− , connClose = sClose s >> freeBuffer readBuf >> freeBuffer writeBuf
87+ , connFree = freeBuffer writeBuf
51− , connRecv = receive s readBuf bufferSize
88+ , connRecv = receive s bufferPool
52− , connReadBuffer = readBuf
89+ , connRecvBuf = receiveBuf s
53 , connWriteBuffer = writeBuf
90 , connWriteBuffer = writeBuf
54 , connBufferSize = bufferSize
91 , connBufferSize = bufferSize
55− , connSendFileOverride = Override s
92+ , connHTTP2 = isH2
58−#if __GLASGOW_HASKELL__ < 702
59−allowInterrupt :: IO ()
60−allowInterrupt = unblock $ return ()
63−-- | Run an 'Application' on the given port. This calls 'runSettings' with
95+-- | Run an 'Application' on the given port.
64−-- 'defaultSettings'.
96+-- This calls 'runSettings' with 'defaultSettings'.
65run :: Port -> Application -> IO ()
97run :: Port -> Application -> IO ()
66run p = runSettings defaultSettings { settingsPort = p }
98run 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
68-- | Run an 'Application' with the given 'Settings'.
117-- | Run an 'Application' with the given 'Settings'.
118+-- This opens a listen socket on the port defined in 'Settings' and
119+-- calls 'runSettingsSocket'.
69runSettings :: Settings -> Application -> IO ()
120runSettings :: Settings -> Application -> IO ()
70runSettings set app = withSocketsDo $
121runSettings set app = withSocketsDo $
72 (bindPortTCP (settingsPort set) (settingsHost set))
123 (bindPortTCP (settingsPort set) (settingsHost set))
74 (\socket -> do
125 (\socket -> do
75 setSocketCloseOnExec socket
126 setSocketCloseOnExec socket
76 runSettingsSocket set socket app)
127 runSettingsSocket set socket app)
78−-- | Same as 'runSettings', but uses a user-supplied socket instead of opening
129+-- | This installs a shutdown handler for the given socket and
79−-- 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
80-- can be used when reverse HTTP proxying into your application.
136-- can be used when reverse HTTP proxying into your application.
82-- 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
83-- 'serverPort' record.
139-- 'serverPort' record.
84runSettingsSocket :: Settings -> Socket -> Application -> IO ()
140runSettingsSocket :: Settings -> Socket -> Application -> IO ()
85−runSettingsSocket set socket app =
141+runSettingsSocket set socket app = do
142+ settingsInstallShutdownHandler set closeListenSocket
86 runSettingsConnection set getConn app
143 runSettingsConnection set getConn app
88 getConn = do
145 getConn = do
@@ -92,13 +149,20 @@ runSettingsSocket set socket app =
92 (s, sa) <- accept socket
149 (s, sa) <- accept socket
94 setSocketCloseOnExec s
151 setSocketCloseOnExec s
152+ -- NoDelay causes an error for AF_UNIX.
153+ setSocketOption s NoDelay 1 `E.catch` \(E.SomeException _) -> return ()
95− conn <- socketConnection s
154+ conn <- socketConnection set s
96 return (conn, sa)
155 return (conn, sa)
98−-- | Allows you to provide a function which will return a 'Connection'. In
157+ closeListenSocket = close socket
99−-- cases where creating the @Connection@ can be expensive, this allows the
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.
100−-- expensive computations to be performed in a separate thread instead of the
164+-- This allows the expensive computations to be performed
101−-- main server loop.
165+-- in a separate worker thread instead of the main server loop.
103-- Since 1.3.5
167-- Since 1.3.5
104runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()
168runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()
@@ -108,138 +172,281 @@ runSettingsConnection set getConn app = runSettingsConnectionMaker set getConnMa
108 (conn, sa) <- getConn
172 (conn, sa) <- getConn
109 return (return conn, sa)
173 return (return conn, sa)
175+-- | This modifies the connection maker so that it returns 'TCP' for 'Transport'
176+-- (i.e. plain HTTP) then calls 'runSettingsConnectionMakerSecure'.
111runSettingsConnectionMaker :: Settings -> IO (IO Connection, SockAddr) -> Application -> IO ()
177runSettingsConnectionMaker :: Settings -> IO (IO Connection, SockAddr) -> Application -> IO ()
112runSettingsConnectionMaker x y =
178runSettingsConnectionMaker x y =
113− runSettingsConnectionMakerSecure x (go y)
179+ runSettingsConnectionMakerSecure x (toTCP <$> y)
115− go = fmap (\(a, b) -> (fmap (, False) a, b))
181+ toTCP = first ((, TCP) <$>)
183+----------------------------------------------------------------
117−-- | Allows you to provide a function which will return a function
185+-- | The core run function which takes 'Settings',
118−-- which will return 'Connection'.
186+-- a connection maker and 'Application'.
187+-- The connection maker can return a connection of either plain HTTP
120-- Since 2.1.4
190-- Since 2.1.4
121−runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Bool), SockAddr) -> Application -> IO ()
191+runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Transport), SockAddr) -> Application -> IO ()
122runSettingsConnectionMakerSecure set getConnMaker app = do
192runSettingsConnectionMakerSecure set getConnMaker app = do
123 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
205+ !fdCacheDurationInSeconds = settingsFdCacheDuration set * 1000000
206+ !fdFileInfoDurationInSeconds = settingsFileInfoCacheDuration set * 1000000
207+ !timeoutInSeconds = settingsTimeout set * 1000000
208+ withTimeoutManager f = case settingsManager set of
211+ (T.initialize timeoutInSeconds)
125− -- Note that there is a thorough discussion of the exception safety of the
215+-- Note that there is a thorough discussion of the exception safety of the
126− -- following code at: https://github.com/yesodweb/wai/issues/146
216+-- following code at: https://github.com/yesodweb/wai/issues/146
128− -- We need to make sure of two things:
218+-- We need to make sure of two things:
130− -- 1. Asynchronous exceptions are not blocked entirely in the main loop.
220+-- 1. Asynchronous exceptions are not blocked entirely in the main loop.
131− -- Doing so would make it impossible to kill the Warp thread.
221+-- Doing so would make it impossible to kill the Warp thread.
133− -- 2. Once a connection maker is received via getConnLoop, the connection
223+-- 2. Once a connection maker is received via acceptNewConnection, the
134− -- is guaranteed to be closed, even in the presence of async exceptions.
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.
136− -- Our approach is explained in the comments below.
239+ -- acceptLoop can be broken by closing the listing socket.
137−
240+ void $ mask_ acceptLoop
138− -- First mask all exceptions in the main loop. This is necessary to ensure
241+ -- In some cases, we want to stop Warp here without graceful shutdown.
139− -- that no async exception is throw between the call to getConnLoop and the
242+ -- So, async exceptions are allowed here.
140− -- registering of connClose.
243+ -- That's why `finally` is not used.
141− D.withDateCache $ \dc -> do
244+ gracefulShutdown set counter
142− F.withFdCache (settingsFdCacheDuration set * 1000000) $ \fc -> do
245+ where
143− withTimeoutManager $ \tm -> mask_ . forever $ do
246+ acceptLoop = do
144 -- Allow async exceptions before receiving the next connection maker.
247 -- Allow async exceptions before receiving the next connection maker.
145 allowInterrupt
248 allowInterrupt
147− -- getConnLoop will try to receive the next incoming request. It
250+ -- acceptNewConnection will try to receive the next incoming
148− -- returns a /connection maker/, not a connection, since in some
251+ -- request. It returns a /connection maker/, not a connection,
149− -- circumstances creating a working connection from a raw socket may be
252+ -- since in some circumstances creating a working connection
150− -- an expensive operation, and this expensive work should not be
253+ -- from a raw socket may be an expensive operation, and this
254+ -- expensive work should not be performed in the main event
151− -- performed in the main event loop. An example of something expensive
255+ -- loop. An example of something expensive would be TLS
152− -- would be TLS negotiation.
256+ -- negotiation.
257+ mx <- acceptNewConnection
259+ Nothing -> return ()
153− (mkConn, addr) <- getConnLoop
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
155− -- 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
156− -- 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
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
167− -- We grab the connection before registering timeouts since the
297+ -- We grab the connection before registering timeouts since the
168− -- timeouts will be useless during connection creation, due to the
298+ -- timeouts will be useless during connection creation, due to the
169− -- fact that async exceptions are still masked.
299+ -- fact that async exceptions are still masked.
170− bracket mkConn (connClose . fst) $ \(conn', isSecure') ->
300+ bracket mkConn cleanUp (serve unmask)
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 dc
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.
181− -- Call the user-supplied on exception code if any
182− -- exceptions are thrown.
183− handle (onE Nothing) .
185− -- Call the user-supplied code for connection open and close events
186− bracket (onOpen addr) (const $ onClose addr) $ \goingon ->
188− -- Actually serve this connection.
189− -- onnClose above ensures the termination of the connection.
190− when goingon $ serveConnection conn ii addr isSecure' set app
192− -- FIXME: only IOEception is caught. What about other exceptions?
302+ cleanUp (conn, _) = connClose conn `finally` connFree conn
193− getConnLoop = getConnMaker `E.catch` \(e :: IOException) -> do
303+
194− onE Nothing (toException e)
304+ -- We need to register a timeout handler for this thread, and
195− -- "resource exhausted (Too many open files)" may happen by accept().
305+ -- cancel that handler as soon as we exit.
196− -- Wait a second hoping that resource will be available.
306+ serve unmask (conn, transport) = bracket register cancel $ \th -> do
197− threadDelay 1000000
307+ -- We now have fully registered a connection close handler in
198− getConnLoop
308+ -- the case of all exceptions, so it is safe to once again
199− onE mreq e =
309+ -- allow async exceptions.
200− case fromException e of
310+ unmask .
201− Just (NotEnoughLines []) -> return ()
311+ -- Call the user-supplied code for connection open and
202− _ -> settingsOnException set mreq e
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
318+ register = T.registerKillThread (timeoutManager ii) (connClose conn)
203− onOpen = settingsOnOpen set
321+ onOpen adr = increase counter >> settingsOnOpen set adr
204− onClose = settingsOnClose set
322+ onClose adr _ = decrease counter >> settingsOnClose set adr
206− withTimeoutManager f =
207− case settingsManager set of
209− (T.initialize $ settingsTimeout set * 1000000)
214serveConnection :: Connection
324serveConnection :: Connection
215 -> InternalInfo
325 -> InternalInfo
216 -> SockAddr
327 -> SockAddr
217− -> Bool -- ^ is secure?
328+ -> Transport
218 -> Settings
329 -> Settings
219 -> Application
330 -> Application
221−serveConnection conn ii addr isSecure' settings app = do
332+serveConnection conn ii th origAddr transport settings app = do
333+ -- fixme: Upgrading to HTTP/2 should be supported.
334+ (h2,bs) <- if isHTTP2 transport then
337+ bs0 <- connRecv conn
338+ if S.length bs0 >= 4 && "PRI " `S.isPrefixOf` bs0 then
222 istatus <- newIORef False
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
223− src <- mkSource (connSource conn th istatus)
359+ src <- mkSource (wrappedRecv conn th istatus (settingsSlowlorisSize settings))
360+ writeIORef istatus True
361+ leftoverSource src bs
362+ addr <- getProxyProtocolAddr src
224− recvSendLoop istatus src `E.catch` \e -> do
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 ()
225− sendErrorResponse istatus e
372+ _ <- sendErrorResponse (dummyreq addr) istatus e
226− throwIO (e :: SomeException)
373+ throwIO e
229− th = threadHandle ii
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
231− sendErrorResponse istatus e = do
420+ sendErrorResponse req istatus e = do
232 status <- readIORef istatus
421 status <- readIORef istatus
233− when status $ void $
422+ if shouldSendErrorResponse e && status
234− sendResponse conn ii dummyreq defaultIndexRequestHeader (return S.empty) (errorResponse e)
424+ sendResponse settings conn ii th req defaultIndexRequestHeader (return S.empty) (errorResponse e)
236− dummyreq = defaultRequest { remoteHost = addr }
427+ dummyreq addr = defaultRequest { remoteHost = addr }
238 errorResponse e = settingsOnExceptionResponse settings e
429 errorResponse e = settingsOnExceptionResponse settings e
240− recvSendLoop istatus fromClient = do
431+ http1 firstRequest addr istatus src = do
241− (req', idxhdr) <- recvRequest settings conn ii addr fromClient
432+ (req, mremainingRef, idxhdr, nextBodyFlush) <- recvRequest firstRequest settings conn ii th addr src transport
242− let req = req' { isSecure = isSecure' }
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
243 -- Let the application run for as long as it wants
450 -- Let the application run for as long as it wants
244 T.pause th
451 T.pause th
@@ -247,54 +454,146 @@ serveConnection conn ii addr isSecure' settings app = do
247 -- creating the request, we need to make sure that we don't get
454 -- creating the request, we need to make sure that we don't get
248 -- an async exception before calling the ResponseSource.
455 -- an async exception before calling the ResponseSource.
249 keepAliveRef <- newIORef $ error "keepAliveRef not filled"
456 keepAliveRef <- newIORef $ error "keepAliveRef not filled"
250− _ <- app req $ \res -> do
457+ r <- E.try $ app req $ \res -> do
251 T.resume th
458 T.resume th
252 -- FIXME consider forcing evaluation of the res here to
459 -- FIXME consider forcing evaluation of the res here to
253 -- send more meaningful error messages to the user.
460 -- send more meaningful error messages to the user.
254 -- However, it may affect performance.
461 -- However, it may affect performance.
255 writeIORef istatus False
462 writeIORef istatus False
256− keepAlive <- sendResponse conn ii req idxhdr (readSource fromClient) res
463+ keepAlive <- sendResponse settings conn ii th req idxhdr (readSource src) res
257 writeIORef keepAliveRef keepAlive
464 writeIORef keepAliveRef keepAlive
258 return ResponseReceived
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
259 keepAlive <- readIORef keepAliveRef
475 keepAlive <- readIORef keepAliveRef
261 -- We just send a Response and it takes a time to
477 -- We just send a Response and it takes a time to
262 -- receive a Request again. If we immediately call recv,
478 -- receive a Request again. If we immediately call recv,
263− -- it is likely to fail and the IO manager works.
479+ -- it is likely to fail and cause the IO manager to do some work.
264− -- It is very costy. So, we yield to another Haskell
480+ -- It is very costly, so we yield to another Haskell
265− -- thread hoping that the next Request will arraive
481+ -- thread hoping that the next Request will arrive
266 -- when this Haskell thread will be re-scheduled.
482 -- when this Haskell thread will be re-scheduled.
267 -- This improves performance at least when
483 -- This improves performance at least when
268 -- the number of cores is small.
484 -- the number of cores is small.
269 Conc.yield
485 Conc.yield
271− when keepAlive $ do
487+ if keepAlive
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
272− -- flush the rest of the request body
499+ -- flush the rest of the request body
273− flushBody $ requestBody req
500+ isComplete <- flushBody nextBodyFlush maxToRead
501+ if isComplete then do
274− T.resume th
502+ T.resume th
275− recvSendLoop istatus fromClient
503+ return True
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
526+ einfo = H2.encodeInfo id 0
527+ frame = H2.GoAwayFrame 0 etype debugmsg
528+ bytestream = H2.encodeFrame einfo frame
277−flushBody :: IO ByteString -> IO ()
530+flushEntireBody :: IO ByteString -> IO ()
278−flushBody src =
531+flushEntireBody src =
281 loop = do
534 loop = do
282 bs <- src
535 bs <- src
283 unless (S.null bs) loop
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
546+ let toRead' = toRead - S.length bs
549+ | S.null bs -> return True
550+ | toRead' >= 0 -> loop toRead'
551+ | otherwise -> return False
285−connSource :: Connection -> T.Handle -> IORef Bool -> IO ByteString
553+wrappedRecv :: Connection -> T.Handle -> IORef Bool -> Int -> IO ByteString
286−connSource Connection { connRecv = recv } th istatus = do
554+wrappedRecv Connection { connRecv = recv } th istatus slowlorisSize = do
287 bs <- recv
555 bs <- recv
288 unless (S.null bs) $ do
556 unless (S.null bs) $ do
289 writeIORef istatus True
557 writeIORef istatus True
290− when (S.length bs >= 2048) $ T.tickle th
558+ when (S.length bs >= slowlorisSize) $ T.tickle th
291 return bs
559 return bs
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)
293-- 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
294setSocketCloseOnExec :: Socket -> IO ()
579setSocketCloseOnExec :: Socket -> IO ()
295#if WINDOWS
580#if WINDOWS
296setSocketCloseOnExec _ = return ()
581setSocketCloseOnExec _ = return ()
298−setSocketCloseOnExec socket =
583+setSocketCloseOnExec socket = do
299− 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