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{- xmpp client support
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Assistant.XMPP.Client where
import Assistant.Common
import Utility.SRV
import Creds
import Network.Protocol.XMPP
import Network
import Control.Concurrent
import qualified Data.Text as T
{- Everything we need to know to connect to an XMPP server. -}
data XMPPCreds = XMPPCreds
{ xmppUsername :: T.Text
, xmppPassword :: T.Text
, xmppHostname :: HostName
, xmppPort :: Int
, xmppJID :: T.Text
}
deriving (Read, Show)
connectXMPP :: XMPPCreds -> (JID -> XMPP a) -> IO [(HostPort, Either SomeException ())]
connectXMPP c a = case parseJID (xmppJID c) of
Nothing -> error "bad JID"
Just jid -> connectXMPP' jid c a
{- Do a SRV lookup, but if it fails, fall back to the cached xmppHostname. -}
connectXMPP' :: JID -> XMPPCreds -> (JID -> XMPP a) -> IO [(HostPort, Either SomeException ())]
connectXMPP' jid c a = reverse <$> (handlesrv =<< lookupSRV srvrecord)
where
srvrecord = mkSRVTcp "xmpp-client" $
T.unpack $ strDomain $ jidDomain jid
serverjid = JID Nothing (jidDomain jid) Nothing
handlesrv [] = do
let h = xmppHostname c
let p = PortNumber $ fromIntegral $ xmppPort c
r <- run h p $ a jid
return [r]
handlesrv srvs = go [] srvs
go l [] = return l
go l ((h,p):rest) = do
{- Try each SRV record in turn, until one connects,
- at which point the MVar will be full. -}
mv <- newEmptyMVar
r <- run h p $ do
liftIO $ putMVar mv ()
a jid
ifM (isEmptyMVar mv)
( go (r : l) rest
, return (r : l)
)
{- Async exceptions are let through so the XMPP thread can
- be killed. -}
run h p a' = do
r <- tryNonAsync $
runClientError (Server serverjid h p) jid
(xmppUsername c) (xmppPassword c) (void a')
return ((h, p), r)
{- XMPP runClient, that throws errors rather than returning an Either -}
runClientError :: Server -> JID -> T.Text -> T.Text -> XMPP a -> IO a
runClientError s j u p x = either (error . show) return =<< runClient s j u p x
getXMPPCreds :: Annex (Maybe XMPPCreds)
getXMPPCreds = parse <$> readCacheCreds xmppCredsFile
where
parse s = readish =<< s
setXMPPCreds :: XMPPCreds -> Annex ()
setXMPPCreds creds = writeCacheCreds (show creds) xmppCredsFile
xmppCredsFile :: FilePath
xmppCredsFile = "xmpp"
|
