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|
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE CPP #-}
module Network.QueryResponse.TCP where
#ifdef THREAD_DEBUG
import Control.Concurrent.Lifted.Instrument
#else
import Control.Concurrent.Lifted
import GHC.Conc (labelThread)
#endif
import Control.Arrow
import Control.Concurrent.STM
import Control.Monad
import Data.ByteString (ByteString,hPut)
import Data.Function
import Data.Hashable
import Data.Maybe
import Data.Ord
import Data.Time.Clock.POSIX
import Data.Word
import Data.String (IsString(..))
import Network.BSD
import Network.Socket
import System.Timeout
import System.IO
import System.IO.Error
import DebugTag
import DPut
import Connection.Tcp (socketFamily)
import qualified Data.MinMaxPSQ as MM
import Network.QueryResponse
data TCPSession st
= PendingTCPSession
| TCPSession
{ tcpHandle :: Handle
, tcpState :: st
, tcpThread :: ThreadId
}
newtype TCPAddress = TCPAddress SockAddr
deriving (Eq,Ord,Show)
instance Hashable TCPAddress where
hashWithSalt salt (TCPAddress x) = case x of
SockAddrInet port addr -> hashWithSalt salt (fromIntegral port :: Word16,addr)
SockAddrInet6 port b c d -> hashWithSalt salt (fromIntegral port :: Word16,b,c,d)
_ -> 0
data TCPCache st = TCPCache
{ lru :: TVar (MM.MinMaxPSQ' TCPAddress (Down POSIXTime) (TCPSession st))
, tcpMax :: Int
}
data SessionProtocol x y = SessionProtocol
{ streamGoodbye :: IO () -- ^ "Goodbye" protocol upon termination.
, streamDecode :: IO (Maybe x) -- ^ Parse inbound messages.
, streamEncode :: y -> IO () -- ^ Serialize outbound messages.
}
data StreamHandshake addr x y = StreamHandshake
{ streamHello :: addr -> Handle -> IO (SessionProtocol x y) -- ^ "Hello" protocol upon fresh connection.
, streamAddr :: addr -> SockAddr
}
killSession :: TCPSession st -> IO ()
killSession PendingTCPSession = return ()
killSession TCPSession{tcpThread=t} = killThread t
showStat :: IsString p => TCPSession st -> p
showStat r = case r of PendingTCPSession -> "pending."
TCPSession {} -> "established."
acquireConnection :: MVar (Maybe (Either a (x, addr)))
-> TCPCache (SessionProtocol x y)
-> StreamHandshake addr x y
-> addr
-> Bool
-> IO (Maybe (y -> IO ()))
acquireConnection mvar tcpcache stream addr bDoCon = do
now <- getPOSIXTime
-- dput XTCP $ "acquireConnection 0 " ++ show (streamAddr stream addr)
entry <- atomically $ do
c <- readTVar (lru tcpcache)
let v = MM.lookup' (TCPAddress $ streamAddr stream addr) c
case v of
Nothing | bDoCon -> writeTVar (lru tcpcache)
$ MM.insert' (TCPAddress $ streamAddr stream addr) PendingTCPSession (Down now) c
| otherwise -> return ()
Just (tm, v) -> modifyTVar' (lru tcpcache) $ MM.insert' (TCPAddress $ streamAddr stream addr) v (Down now)
return v
-- dput XTCP $ "acquireConnection 1 " ++ show (streamAddr stream addr, fmap (second showStat) entry)
case entry of
Nothing -> fmap join $ forM (guard bDoCon) $ \() -> do
proto <- getProtocolNumber "tcp"
mh <- catchIOError (do h <- timeout 10000000 $ do
sock <- socket (socketFamily $ streamAddr stream addr) Stream proto
connect sock (streamAddr stream addr) `catchIOError` (\e -> close sock)
h <- socketToHandle sock ReadWriteMode
hSetBuffering h NoBuffering
return h
return h)
$ \e -> return Nothing
ret <- fmap join $ forM mh $ \h -> do
st <- streamHello stream addr h
dput XTCP $ "TCP Connected! " ++ show (streamAddr stream addr)
signal <- newTVarIO False
let showAddr a = show (streamAddr stream a)
rthread <- forkLabeled ("tcp:"++showAddr addr) $ do
atomically (readTVar signal >>= check)
fix $ \loop -> do
x <- streamDecode st
dput XTCP $ "TCP streamDecode " ++ show (streamAddr stream addr) ++ " --> " ++ maybe "Nothing" (const "got") x
case x of
Just u -> do
m <- timeout (1000000) $ putMVar mvar $ Just $ Right (u, addr)
when (isNothing m) $ do
dput XTCP $ "TCP "++show (streamAddr stream addr) ++ " dropped packet."
tryTakeMVar mvar
return ()
loop
Nothing -> do
dput XTCP $ "TCP disconnected: " ++ show (streamAddr stream addr)
do atomically $ modifyTVar' (lru tcpcache)
$ MM.delete (TCPAddress $ streamAddr stream addr)
c <- atomically $ readTVar (lru tcpcache)
now <- getPOSIXTime
forM_ (zip [1..] $ MM.toList c) $ \(i,MM.Binding (TCPAddress addr) r (Down tm)) -> do
dput XTCP $ unwords [show i ++ ".", "Still connected:", show addr, show (now - tm), showStat r]
hClose h
let v = TCPSession
{ tcpHandle = h
, tcpState = st
, tcpThread = rthread
}
t <- getPOSIXTime
retires <- atomically $ do
c <- readTVar (lru tcpcache)
let (rs,c') = MM.takeView (tcpMax tcpcache)
$ MM.insert' (TCPAddress $ streamAddr stream addr) v (Down t) c
writeTVar (lru tcpcache) c'
writeTVar signal True
return rs
forM_ retires $ \(MM.Binding (TCPAddress k) r _) -> void $ forkLabeled ("tcp-close:"++show k) $ do
dput XTCP $ "TCP dropped: " ++ show k
killSession r
case r of TCPSession {tcpState=st,tcpHandle=h} -> do
streamGoodbye st
hClose h
_ -> return ()
return $ Just $ streamEncode st
when (isNothing ret) $ do
atomically $ modifyTVar' (lru tcpcache) $ MM.delete (TCPAddress $ streamAddr stream addr)
return ret
Just (tm, PendingTCPSession)
| not bDoCon -> return Nothing
| otherwise -> fmap join $ timeout 10000000 $ atomically $ do
c <- readTVar (lru tcpcache)
let v = MM.lookup' (TCPAddress $ streamAddr stream addr) c
case v of
Just (_,TCPSession{tcpState=st}) -> return $ Just $ streamEncode st
Nothing -> return Nothing
_ -> retry
Just (tm, v@TCPSession {tcpState=st}) -> return $ Just $ streamEncode st
closeAll :: TCPCache (SessionProtocol x y) -> StreamHandshake addr x y -> IO ()
closeAll tcpcache stream = do
dput XTCP "TCP.closeAll called."
cache <- atomically $ swapTVar (lru tcpcache) MM.empty
forM_ (MM.toList cache) $ \(MM.Binding (TCPAddress addr) r tm) -> do
killSession r
case r of TCPSession{tcpState=st,tcpHandle=h} -> streamGoodbye st >> hClose h
_ -> return ()
tcpTransport :: Int -- ^ maximum number of TCP links to maintain.
-> StreamHandshake addr x y
-> IO (TCPCache (SessionProtocol x y), TransportA err addr x (Bool,y))
tcpTransport maxcon stream = do
msgvar <- newEmptyMVar
tcpcache <- atomically $ (`TCPCache` maxcon) <$> newTVar (MM.empty)
return $ (,) tcpcache Transport
{ awaitMessage = \f -> takeMVar msgvar >>= \x -> f x `catchIOError` (\e -> dput XTCP ("TCP transport stopped. " ++ show e) >> f Nothing)
, sendMessage = \addr (bDoCon,y) -> do
void . forkLabeled "tcp-send" $ do
msock <- acquireConnection msgvar tcpcache stream addr bDoCon
mapM_ ($ y) msock
`catchIOError` \e -> dput XTCP $ "TCP-send: " ++ show e
, closeTransport = closeAll tcpcache stream >> putMVar msgvar Nothing
}
|
