xmonad-config/lib/Xmobar/Plugins/VPN.hs

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--------------------------------------------------------------------------------
-- | VPN plugin
--
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-- Use the networkmanager to detect when a VPN interface is added or removed.
-- Specifically, monitor the object tree to detect paths with the interface
-- "org.freedesktop.NetworkManager.Device.Tun".
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module Xmobar.Plugins.VPN
( VPN(..)
, vpnAlias
, vpnDep
) where
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import Control.Concurrent.MVar
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import Control.Monad
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import qualified Data.Map as M
import Data.Maybe
import qualified Data.Set as S
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import DBus
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import DBus.Client
import DBus.Internal
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import XMonad.Internal.Dependency
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import Xmobar
import Xmobar.Plugins.Common
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newtype VPN = VPN (String, Colors) deriving (Read, Show)
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instance Exec VPN where
alias (VPN _) = vpnAlias
start (VPN (text, colors)) cb =
withDBusClientConnection True cb $ \c -> do
state <- initState c
let display = displayMaybe cb iconFormatter . Just =<< readState state
let signalCallback' f = f state display
vpnAddedListener (signalCallback' addedCallback) c
vpnRemovedListener (signalCallback' removedCallback) c
display
where
iconFormatter b = return $ colorText colors b text
--------------------------------------------------------------------------------
-- | VPN State
--
-- Maintain a set of paths which are the currently active VPNs. Most of the time
-- this will be a null or singleton set, but this setup could handle the edge
-- case of multiple VPNs being active at once without puking.
type VPNState = S.Set ObjectPath
type MutableVPNState = MVar VPNState
initState :: Client -> IO MutableVPNState
initState client = do
ot <- getVPNObjectTree client
newMVar $ findTunnels ot
readState :: MutableVPNState -> IO Bool
readState = fmap (not . null) . readMVar
updateState :: (ObjectPath -> VPNState -> VPNState) -> MutableVPNState
-> ObjectPath -> IO ()
updateState f state op = modifyMVar_ state $ return . f op
--------------------------------------------------------------------------------
-- | Tunnel Device Detection
--
getVPNObjectTree :: Client -> IO ObjectTree
getVPNObjectTree client = callGetManagedObjects client vpnBus vpnPath
findTunnels :: ObjectTree -> VPNState
findTunnels = S.fromList . M.keys . M.filter (elem vpnDeviceTun . M.keys)
vpnAddedListener :: SignalCallback -> Client -> IO ()
vpnAddedListener = fmap void . addInterfaceAddedListener vpnBus vpnPath
vpnRemovedListener :: SignalCallback -> Client -> IO ()
vpnRemovedListener = fmap void . addInterfaceRemovedListener vpnBus vpnPath
addedCallback :: MutableVPNState -> IO () -> SignalCallback
addedCallback state display [device, added] = update >> display
where
added' = fromVariant added :: Maybe (M.Map String (M.Map String Variant))
is = M.keys $ fromMaybe M.empty added'
update = updateDevice S.insert state device is
addedCallback _ _ _ = return ()
removedCallback :: MutableVPNState -> IO () -> SignalCallback
removedCallback state display [device, interfaces] = update >> display
where
is = fromMaybe [] $ fromVariant interfaces :: [String]
update = updateDevice S.delete state device is
removedCallback _ _ _ = return ()
updateDevice :: (ObjectPath -> VPNState -> VPNState) -> MutableVPNState
-> Variant -> [String] -> IO ()
updateDevice f state device interfaces = when (vpnDeviceTun `elem` interfaces) $
forM_ d $ updateState f state
where
d = fromVariant device :: Maybe ObjectPath
--------------------------------------------------------------------------------
-- | DBus Interface
--
vpnBus :: BusName
vpnBus = busName_ "org.freedesktop.NetworkManager"
vpnPath :: ObjectPath
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vpnPath = objectPath_ "/org/freedesktop"
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vpnDeviceTun :: String
vpnDeviceTun = "org.freedesktop.NetworkManager.Device.Tun"
vpnAlias :: String
vpnAlias = "vpn"
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vpnDep :: DBusDep
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vpnDep = Endpoint vpnBus vpnPath omInterface $ Method_ getManagedObjects