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{- git-annex assistant network connection watcher, using dbus
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
{-# LANGUAGE OverloadedStrings #-}
module Assistant.Threads.NetWatcher where
import Assistant.Common
import Assistant.ThreadedMonad
import Assistant.DaemonStatus
import Assistant.ScanRemotes
import Assistant.Sync
import Utility.ThreadScheduler
import Remote.List
import qualified Types.Remote as Remote
import qualified Control.Exception as E
#if WITH_DBUS
import Utility.DBus
import DBus.Client
import DBus
import Data.Word (Word32)
#else
#warning Building without dbus support; will poll for network connection changes
#endif
thisThread :: ThreadName
thisThread = "NetWatcher"
netWatcherThread :: ThreadState -> DaemonStatusHandle -> ScanRemoteMap -> NamedThread
netWatcherThread st dstatus scanremotes = thread $
#if WITH_DBUS
dbusThread st dstatus scanremotes
#else
noop
#endif
where
thread = NamedThread thisThread
{- This is a fallback for when dbus cannot be used to detect
- network connection changes, but it also ensures that
- any networked remotes that may have not been routable for a
- while (despite the local network staying up), are synced with
- periodically. -}
netWatcherFallbackThread :: ThreadState -> DaemonStatusHandle -> ScanRemoteMap -> NamedThread
netWatcherFallbackThread st dstatus scanremotes = thread $
runEvery (Seconds 3600) $
handleConnection st dstatus scanremotes
where
thread = NamedThread thisThread
#if WITH_DBUS
dbusThread :: ThreadState -> DaemonStatusHandle -> ScanRemoteMap -> IO ()
dbusThread st dstatus scanremotes = E.catch (go =<< connectSystem) onerr
where
go client = ifM (checkNetMonitor client)
( do
listenNMConnections client handle
listenWicdConnections client handle
, do
runThreadState st $
warning "No known network monitor available through dbus; falling back to polling"
)
onerr :: E.SomeException -> IO ()
onerr e = runThreadState st $
warning $ "Failed to use dbus; falling back to polling (" ++ show e ++ ")"
handle = do
debug thisThread ["detected network connection"]
handleConnection st dstatus scanremotes
{- Examine the list of services connected to dbus, to see if there
- are any we can use to monitor network connections. -}
checkNetMonitor :: Client -> IO Bool
checkNetMonitor client = do
running <- filter (`elem` [networkmanager, wicd])
<$> listServiceNames client
case running of
[] -> return False
(service:_) -> do
debug thisThread [ "Using running DBUS service"
, service
, "to monitor network connection events."
]
return True
where
networkmanager = "org.freedesktop.NetworkManager"
wicd = "org.wicd.daemon"
{- Listens for new NetworkManager connections. -}
listenNMConnections :: Client -> IO () -> IO ()
listenNMConnections client callback =
listen client matcher $ \event ->
when (Just True == anyM activeconnection (signalBody event)) $
callback
where
matcher = matchAny
{ matchInterface = Just "org.freedesktop.NetworkManager.Connection.Active"
, matchMember = Just "PropertiesChanged"
}
nm_connection_activated = toVariant (2 :: Word32)
nm_state_key = toVariant ("State" :: String)
activeconnection v = do
m <- fromVariant v
vstate <- lookup nm_state_key $ dictionaryItems m
state <- fromVariant vstate
return $ state == nm_connection_activated
{- Listens for new Wicd connections. -}
listenWicdConnections :: Client -> IO () -> IO ()
listenWicdConnections client callback =
listen client matcher $ \event ->
when (any (== wicd_success) (signalBody event)) $
callback
where
matcher = matchAny
{ matchInterface = Just "org.wicd.daemon"
, matchMember = Just "ConnectResultsSent"
}
wicd_success = toVariant ("success" :: String)
#endif
handleConnection :: ThreadState -> DaemonStatusHandle -> ScanRemoteMap -> IO ()
handleConnection st dstatus scanremotes =
reconnectRemotes thisThread st dstatus scanremotes
=<< networkRemotes st
{- Finds network remotes. -}
networkRemotes :: ThreadState -> IO [Remote]
networkRemotes st = runThreadState st $
filter (isNothing . Remote.localpath) <$> remoteList
|
