xmonad-config/lib/DBus/Internal.hs

205 lines
6.7 KiB
Haskell

--------------------------------------------------------------------------------
-- | Common internal DBus functions
module DBus.Internal
( addMatchCallback
, getDBusClient
, fromDBusClient
, withDBusClient
, withDBusClient_
, matchProperty
, matchPropertyFull
, matchPropertyChanged
, SignalMatch(..)
, SignalCallback
, MethodBody
, withSignalMatch
, callPropertyGet
, callMethod
, callMethod'
, methodCallBus
, callGetManagedObjects
, ObjectTree
, getManagedObjects
, omInterface
, addInterfaceAddedListener
, addInterfaceRemovedListener
, fromSingletonVariant
, bodyToMaybe
) where
import Control.Exception
import Control.Monad
import Data.Bifunctor
import qualified Data.Map.Strict as M
import Data.Maybe
import DBus
import DBus.Client
--------------------------------------------------------------------------------
-- | Methods
type MethodBody = Either String [Variant]
callMethod' :: Client -> MethodCall -> IO MethodBody
callMethod' cl = fmap (bimap methodErrorMessage methodReturnBody) . call cl
callMethod :: Client -> BusName -> ObjectPath -> InterfaceName -> MemberName
-> IO MethodBody
callMethod client bus path iface = callMethod' client . methodCallBus bus path iface
methodCallBus :: BusName -> ObjectPath -> InterfaceName -> MemberName -> MethodCall
methodCallBus b p i m = (methodCall p i m)
{ methodCallDestination = Just b }
--------------------------------------------------------------------------------
-- | Bus names
dbusInterface :: InterfaceName
dbusInterface = interfaceName_ "org.freedesktop.DBus"
callGetNameOwner :: Client -> BusName -> IO (Maybe BusName)
callGetNameOwner client name = bodyToMaybe <$> callMethod' client mc
where
mc = (methodCallBus dbusName dbusPath dbusInterface mem)
{ methodCallBody = [toVariant name] }
mem = memberName_ "GetNameOwner"
--------------------------------------------------------------------------------
-- | Variant parsing
fromSingletonVariant :: IsVariant a => [Variant] -> Maybe a
fromSingletonVariant = fromVariant <=< listToMaybe
bodyToMaybe :: IsVariant a => MethodBody -> Maybe a
bodyToMaybe = either (const Nothing) fromSingletonVariant
--------------------------------------------------------------------------------
-- | Signals
type SignalCallback = [Variant] -> IO ()
addMatchCallback :: MatchRule -> SignalCallback -> Client -> IO SignalHandler
addMatchCallback rule cb client = addMatch client rule $ cb . signalBody
matchSignal :: Maybe BusName -> Maybe ObjectPath -> Maybe InterfaceName
-> Maybe MemberName -> MatchRule
matchSignal b p i m = matchAny
{ matchPath = p
, matchSender = b
, matchInterface = i
, matchMember = m
}
matchSignalFull :: Client -> BusName -> Maybe ObjectPath -> Maybe InterfaceName
-> Maybe MemberName -> IO (Maybe MatchRule)
matchSignalFull client b p i m =
fmap (\o -> matchSignal (Just o) p i m) <$> callGetNameOwner client b
--------------------------------------------------------------------------------
-- | Properties
propertyInterface :: InterfaceName
propertyInterface = interfaceName_ "org.freedesktop.DBus.Properties"
propertySignal :: MemberName
propertySignal = memberName_ "PropertiesChanged"
callPropertyGet :: BusName -> ObjectPath -> InterfaceName -> MemberName -> Client
-> IO [Variant]
callPropertyGet bus path iface property client = fmap (either (const []) (:[]))
$ getProperty client $ methodCallBus bus path iface property
matchProperty :: Maybe BusName -> Maybe ObjectPath -> MatchRule
matchProperty b p =
matchSignal b p (Just propertyInterface) (Just propertySignal)
matchPropertyFull :: Client -> BusName -> Maybe ObjectPath -> IO (Maybe MatchRule)
matchPropertyFull client b p =
matchSignalFull client b p (Just propertyInterface) (Just propertySignal)
data SignalMatch a = Match a | NoMatch | Failure deriving (Eq, Show)
withSignalMatch :: (Maybe a -> IO ()) -> SignalMatch a -> IO ()
withSignalMatch f (Match x) = f (Just x)
withSignalMatch f Failure = f Nothing
withSignalMatch _ NoMatch = return ()
matchPropertyChanged :: IsVariant a => InterfaceName -> String -> [Variant]
-> SignalMatch a
matchPropertyChanged iface property [i, body, _] =
let i' = (fromVariant i :: Maybe String)
b = toMap body in
case (i', b) of
(Just i'', Just b') -> if i'' == formatInterfaceName iface then
maybe NoMatch Match $ fromVariant =<< M.lookup property b'
else NoMatch
_ -> Failure
where
toMap v = fromVariant v :: Maybe (M.Map String Variant)
matchPropertyChanged _ _ _ = Failure
--------------------------------------------------------------------------------
-- | Client requests
getDBusClient :: Bool -> IO (Maybe Client)
getDBusClient sys = do
res <- try $ if sys then connectSystem else connectSession
case res of
Left e -> putStrLn (clientErrorMessage e) >> return Nothing
Right c -> return $ Just c
withDBusClient :: Bool -> (Client -> IO a) -> IO (Maybe a)
withDBusClient sys f = do
client <- getDBusClient sys
forM client $ \c -> do
r <- f c
disconnect c
return r
withDBusClient_ :: Bool -> (Client -> IO ()) -> IO ()
withDBusClient_ sys = void . withDBusClient sys
fromDBusClient :: Bool -> (Client -> a) -> IO (Maybe a)
fromDBusClient sys f = withDBusClient sys (return . f)
--------------------------------------------------------------------------------
-- | Object Manager
type ObjectTree = M.Map ObjectPath (M.Map String (M.Map String Variant))
omInterface :: InterfaceName
omInterface = interfaceName_ "org.freedesktop.DBus.ObjectManager"
getManagedObjects :: MemberName
getManagedObjects = memberName_ "GetManagedObjects"
omInterfacesAdded :: MemberName
omInterfacesAdded = memberName_ "InterfacesAdded"
omInterfacesRemoved :: MemberName
omInterfacesRemoved = memberName_ "InterfacesRemoved"
callGetManagedObjects :: Client -> BusName -> ObjectPath -> IO ObjectTree
callGetManagedObjects client bus path =
either (const M.empty) (fromMaybe M.empty . fromSingletonVariant)
<$> callMethod client bus path omInterface getManagedObjects
addInterfaceChangedListener :: BusName -> MemberName -> ObjectPath
-> SignalCallback -> Client -> IO (Maybe SignalHandler)
addInterfaceChangedListener bus prop path sc client = do
rule <- matchSignalFull client bus (Just path) (Just omInterface) (Just prop)
forM rule $ \r -> addMatchCallback r sc client
addInterfaceAddedListener :: BusName -> ObjectPath -> SignalCallback -> Client
-> IO (Maybe SignalHandler)
addInterfaceAddedListener bus =
addInterfaceChangedListener bus omInterfacesAdded
addInterfaceRemovedListener :: BusName -> ObjectPath -> SignalCallback -> Client
-> IO (Maybe SignalHandler)
addInterfaceRemovedListener bus =
addInterfaceChangedListener bus omInterfacesRemoved