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{-# LANGUAGE OverloadedStrings #-}
import Control.Monad.Trans.Resource (runResourceT)
import Control.Monad.Trans (lift)
import Control.Monad.IO.Class (liftIO)
import Control.Monad.Fix (fix)
import Control.Monad
import Control.Concurrent (forkIO)
import Control.Concurrent.STM
-- import Control.Concurrent.STM.TChan
import Network.Socket
import XMPPTypes (withPort)
import Text.Printf
import System.Posix.Signals
import Data.ByteString (ByteString)
import qualified Data.ByteString.Char8 as Strict8
-- import qualified Data.ByteString.Lazy.Char8 as Lazy8
import Data.Conduit
import qualified Data.Conduit.List as CL
import qualified Data.Conduit.Binary as CB
import qualified Text.XML.Stream.Render as XML
import qualified Text.XML.Stream.Parse as XML
import Data.XML.Types as XML
import Data.Maybe (catMaybes)
import Data.Monoid ( (<>) )
import qualified Control.Concurrent.STM.UpdateStream as Slotted
import ControlMaybe
import NestingXML
import Server
wlog s = putStrLn s
where _ = s :: String
wlogb s = Strict8.putStrLn s
control sv = atomically . putTMVar (serverCommand sv)
-- Note: This function ignores name space qualification
elementAttrs expected (EventBeginElement name attrs)
| nameLocalName name==expected
= return attrs
elementAttrs _ _ = mzero
getStreamName (EventBeginElement name _) = name
xmlStream :: ReadCommand -> WriteCommand -> ( Source IO XML.Event
, Sink XML.Event IO () )
xmlStream conread conwrite = (xsrc,xsnk)
where
xsrc = src $= XML.parseBytes XML.def
xsnk = XML.renderBytes XML.def =$ snk
src = do
v <- lift conread
maybe (return ()) -- lift . wlog $ "conread: Nothing")
(\v -> yield v >> src)
v
snk = awaitForever $ liftIO . conwrite
type FlagCommand = IO Bool
type ReadCommand = IO (Maybe ByteString)
type WriteCommand = ByteString -> IO Bool
data Stanza
= UnrecognizedStanza { stanzaChan :: TChan (Maybe XML.Event) }
prettyPrint prefix xs =
liftIO $
CL.sourceList xs
$= XML.renderBytes (XML.def { XML.rsPretty=True })
=$= CB.lines
$$ CL.mapM_ (wlogb . (prefix <>))
xmppInbound :: ConnectionKey -> FlagCommand
-> Source IO XML.Event
-> TChan Stanza
-> Sink XML.Event IO ()
xmppInbound k pingflag src stanzas = doNestingXML $ do
withXML $ \begindoc -> do
when (begindoc==EventBeginDocument) $ do
-- liftIO . wlog $ "begin-doc"
withXML $ \xml -> do
withJust (elementAttrs "stream" xml) $ \stream_attrs -> do
-- liftIO . wlog $ "stream: " ++ show (getStreamName xml)
-- liftIO . wlog $ "stream atributes: " ++ show stream_attrs
fix $ \loop -> do
-- liftIO . wlog $ "waiting for stanza."
chan <- liftIO $ atomically newTChan
whenJust nextElement $ \stanza -> do
stanza_lvl <- nesting
liftIO . atomically $ writeTChan chan (Just stanza)
-- liftIO . wlog $ "stanza: "++show stanza
liftIO . atomically $ writeTChan stanzas $
UnrecognizedStanza chan
doUntilCloser stanza_lvl $ \xml -> do
liftIO . atomically $ writeTChan chan (Just xml)
-- liftIO . wlog $ "-stanza: " ++ show xml
liftIO . atomically $ writeTChan chan Nothing
loop
chanContents :: TChan x -> IO [x]
chanContents ch = do
x <- atomically $ do
bempty <- isEmptyTChan ch
if bempty
then return Nothing
else fmap Just $ readTChan ch
maybe (return [])
(\x -> do
xs <- chanContents ch
return (x:xs))
x
isEventBeginElement (EventBeginElement {}) = True
isEventBeginElement _ = False
isEventEndElement (EventEndElement {}) = True
isEventEndElement _ = False
forkConnection :: ConnectionKey
-> FlagCommand
-> Source IO XML.Event
-> Sink XML.Event IO ()
-> TChan Stanza
-> IO (Slotted.UpdateStream () XML.Event)
forkConnection k pingflag src snk stanzas = do
rdone <- atomically newEmptyTMVar
forkIO $ do
-- src $$ awaitForever (lift . putStrLn . takeWhile (/=' ') . show)
src $$ xmppInbound k pingflag src stanzas
atomically $ putTMVar rdone ()
wlog $ "end reader fork: " ++ show k
output <- atomically $ Slotted.new isEventBeginElement isEventEndElement
let slot_src = do
what <- lift . atomically $ orElse
(Slotted.pull output >>= \x -> return $ do
yield x
slot_src)
(takeTMVar rdone >> return (return ()))
what
forkIO $ do slot_src $$ snk
wlog $ "end writer fork: " ++ show k
return output
monitor sv params = do
chan <- return $ serverEvent sv
stanzas <- atomically newTChan
fix $ \loop -> do
action <- atomically $ foldr1 orElse
[ readTChan chan >>= \(k,e) -> return $ do
case e of
Connection pingflag conread conwrite -> do
let (xsrc,xsnk) = xmlStream conread conwrite
forkConnection k pingflag xsrc xsnk stanzas
wlog $ tomsg k "Connection"
EOF -> wlog $ tomsg k "EOF"
HalfConnection In -> do
wlog $ tomsg k "ReadOnly"
control sv (Connect (callBackAddress k) params)
HalfConnection Out -> wlog $ tomsg k "WriteOnly"
RequiresPing -> wlog $ tomsg k "RequiresPing"
_ -> return ()
, readTChan stanzas >>= \stanza -> return $ do
xs <- chanContents (stanzaChan stanza)
prettyPrint "STANZA: " (catMaybes xs) ---- wlog $ "STANZA: "++ show (catMaybes xs)
]
action
loop
where
tomsg k str = printf "%12s %s" str (show k)
where
_ = str :: String
data ConnectionKey
= PeerKey { callBackAddress :: SockAddr }
| ClientKey { localAddress :: SockAddr }
deriving (Show, Ord, Eq)
peerKey (sock,addr) = do
peer <- getPeerName sock
return $ PeerKey (peer `withPort` fromIntegral peerport)
clientKey (sock,addr) = return $ ClientKey addr
peerport = 5269
clientport = 5222
main = runResourceT $ do
sv <- server
lift $ do
peer_params <- return (connectionDefaults peerKey)
{ pingInterval = 0
, timeout = 0
, duplex = False }
client_params <- return $ connectionDefaults clientKey
forkIO $ monitor sv peer_params
control sv (Listen peerport peer_params)
-- control sv (Listen clientport client_params)
-- atomically $ newEmptyTMVar >>= readTMVar -- Wait for control-c
quitVar <- newEmptyTMVarIO
installHandler sigTERM (CatchOnce (atomically $ putTMVar quitVar True)) Nothing
installHandler sigINT (CatchOnce (atomically $ putTMVar quitVar True)) Nothing
quitMessage <- atomically $ takeTMVar quitVar
wlog "goodbye."
return ()
|
