module DBus.Message where
import Control.Applicative
import Control.Concurrent.STM
import Control.Monad
import Control.Monad.Reader
import qualified Data.Attoparsec.ByteString.Char8 as AP8
import qualified Data.Binary.Get as B
import Data.Bits
import qualified Data.ByteString as BS
import qualified Data.ByteString.Lazy.Builder as BS
import Data.Char
import qualified Data.Conduit as C
import qualified Data.Map as Map
import Data.Maybe
import Data.Monoid
import Data.Singletons
import qualified Data.Text as Text
import Data.Word
import System.Mem.Weak
import Control.Monad.Catch (MonadThrow, throwM)
import DBus.Error
import DBus.Representable
import DBus.TH
import DBus.Types
import DBus.Wire
data MessageType = Invalid
| MethodCall
| MethodReturn
| Error
| Signal
| Other Word8
deriving (Eq, Show)
instance Representable MessageType where
type RepType MessageType = 'DBusSimpleType TypeByte
toRep Invalid = DBVByte $ 0
toRep MethodCall = DBVByte $ 1
toRep MethodReturn = DBVByte $ 2
toRep Error = DBVByte $ 3
toRep Signal = DBVByte $ 4
toRep (Other i) = DBVByte $ fromIntegral i
fromRep (DBVByte 0) = Just $ Invalid
fromRep (DBVByte 1) = Just $ MethodCall
fromRep (DBVByte 2) = Just $ MethodReturn
fromRep (DBVByte 3) = Just $ Error
fromRep (DBVByte 4) = Just $ Signal
fromRep (DBVByte i) = Just $ Other $ fromIntegral i
data Flag = NoReplyExpected
| NoAutoStart
deriving (Eq, Show)
newtype Flags = Flags [Flag]
deriving (Show, Eq)
instance Representable Flags where
type RepType Flags = 'DBusSimpleType TypeByte
toRep (Flags xs) = DBVByte $ foldr (.|.) 0 (map toFlag xs)
where
toFlag NoReplyExpected = 0x1
toFlag NoAutoStart = 0x2
fromRep (DBVByte x) = Just . Flags $ fromFlags x
fromFlags x | x .&. 0x1 > 0 = NoReplyExpected : fromFlags (x `xor` 0x1)
| x .&. 0x2 > 0 = NoAutoStart : fromFlags (x `xor` 0x2)
| otherwise = []
instance Representable Signature where
type RepType Signature = 'DBusSimpleType TypeSignature
toRep (Signature ts) = DBVSignature ts
fromRep (DBVSignature ts) = Just $ Signature ts
data HeaderFields = HeaderFields { hFPath :: Maybe ObjectPath
, hFInterface :: Maybe Text.Text
, hFMember :: Maybe Text.Text
, hFErrorName :: Maybe Text.Text
, hFReplySerial :: Maybe Word32
, hFDestination :: Maybe Text.Text
, hFSender :: Maybe Text.Text
, hFMessageSignature :: Maybe Signature
, hFUnixfds :: Maybe Word32
} deriving (Show, Eq)
instance Representable HeaderFields where
type RepType HeaderFields = RepType [HeaderField]
toRep = toRep . toFields
fromRep = fmap fromFields . fromRep
emptyHeaderFields :: HeaderFields
emptyHeaderFields = HeaderFields Nothing Nothing Nothing Nothing Nothing
Nothing Nothing Nothing Nothing
toFields :: HeaderFields -> [HeaderField]
toFields hfs = catMaybes
[ HeaderFieldPath <$> hFPath hfs
, HeaderFieldInterface <$> hFInterface hfs
, HeaderFieldMember <$> hFMember hfs
, HeaderFieldErrorName <$> hFErrorName hfs
, HeaderFieldReplySerial <$> hFReplySerial hfs
, HeaderFieldDestination <$> hFDestination hfs
, HeaderFieldSender <$> hFSender hfs
, HeaderFieldMessageSignature <$> hFMessageSignature hfs
, HeaderFieldUnixFDs <$> hFUnixfds hfs
]
fromFields :: [HeaderField] -> HeaderFields
fromFields fs = foldr fromField emptyHeaderFields fs
where
fromField (HeaderFieldPath x) hf = hf{hFPath = Just x}
fromField (HeaderFieldInterface x) hf = hf{hFInterface = Just x}
fromField (HeaderFieldMember x) hf = hf{hFMember = Just x}
fromField (HeaderFieldErrorName x) hf = hf{hFErrorName = Just x}
fromField (HeaderFieldReplySerial x) hf = hf{hFReplySerial = Just x}
fromField (HeaderFieldDestination x) hf = hf{hFDestination = Just x}
fromField (HeaderFieldSender x) hf = hf{hFSender = Just x}
fromField (HeaderFieldMessageSignature x) hf = hf{hFMessageSignature = Just x}
fromField (HeaderFieldUnixFDs x) hf = hf{hFUnixfds = Just x}
fromFields _ hf = hf
data HeaderField = HeaderFieldInvalid
| HeaderFieldPath ObjectPath
| HeaderFieldInterface Text.Text
| HeaderFieldMember Text.Text
| HeaderFieldErrorName Text.Text
| HeaderFieldReplySerial Word32
| HeaderFieldDestination Text.Text
| HeaderFieldSender Text.Text
| HeaderFieldMessageSignature Signature
| HeaderFieldUnixFDs Word32
deriving (Show, Eq)
makeRepresentable ''HeaderField
instance Representable Endian where
type RepType Endian = 'DBusSimpleType TypeByte
toRep Little = DBVByte $ fromIntegral $ ord 'l'
toRep Big = DBVByte $ fromIntegral $ ord 'b'
fromRep (DBVByte x) = case chr (fromIntegral x) of
'l' -> Just Little
'b' -> Just Big
_ -> Nothing
data MessageHeader =
MessageHeader { endianessFlag :: Endian
, messageType :: MessageType
, flags :: Flags
, version :: Word8
, messageLength :: Word32
, serial :: Word32
, fields :: HeaderFields
} deriving (Show, Eq)
makeRepresentable ''MessageHeader
methodCall :: Word32
-> Text.Text
-> ObjectPath
-> Text.Text
-> Text.Text
-> [SomeDBusValue]
-> [Flag]
-> BS.Builder
methodCall sid dest path interface member args flags =
let hFields = emptyHeaderFields{ hFPath = Just path
, hFInterface = Just interface
, hFMember = Just member
, hFDestination = Just dest
}
header = MessageHeader
{ endianessFlag = Little
, messageType = MethodCall
, flags = Flags flags
, version = 1
, messageLength = 0
, serial = sid
, fields = hFields
}
in serializeMessage header args
methodReturn :: Word32
-> Word32
-> Text.Text
-> [SomeDBusValue]
-> BS.Builder
methodReturn sid rsid dest args =
let hFields = emptyHeaderFields{ hFDestination = Just dest
, hFReplySerial = Just rsid
}
header = MessageHeader
{ endianessFlag = Little
, messageType = MethodReturn
, flags = Flags []
, version = 1
, messageLength = 0
, serial = sid
, fields = hFields
}
in serializeMessage header args
errorMessage :: Word32
-> Maybe Word32
-> Text.Text
-> Text.Text
-> Maybe Text.Text
-> [SomeDBusValue]
-> BS.Builder
errorMessage sid rsid dest name text args =
let hFields = emptyHeaderFields{ hFDestination = Just dest
, hFErrorName = Just name
, hFReplySerial = rsid
}
header = MessageHeader
{ endianessFlag = Little
, messageType = Error
, flags = Flags []
, version = 1
, messageLength = 0
, serial = sid
, fields = hFields
}
in serializeMessage header (maybe id (\t -> (DBV (DBVString t) :))
text args)
serializeMessage head args =
let vs = putValues args
sig = Signature $ map (\(DBV v) -> typeOf v) args
header len = head { messageLength = len
, fields = (fields head){hFMessageSignature = Just sig}
}
in runDBusPut Little $ do
l <- sizeOf 0 1 vs
putDBV . toRep $ header (fromIntegral l)
alignPut 8
vs
getMessage = do
mbEndian <- fromRep <$> (B.lookAhead $ runReaderT getDBV Little)
endian <- case mbEndian of
Nothing -> fail "could not read endiannes flag"
Just e -> return e
flip runReaderT endian $ do
mbHeader <- fromRep <$> getDBV
header <- case mbHeader of
Nothing -> fail "Header has wrong type"
Just h -> return h
alignGet 8
args <- case hFMessageSignature $ fields header of
Nothing -> return []
Just (Signature sigs) -> forM sigs $ \t ->
getDBVByType t
return (header, args)
parseMessages :: MonadThrow m =>
C.ConduitM BS.ByteString (MessageHeader, [SomeDBusValue]) m b
parseMessages = forever $ C.yield =<< sinkGet getMessage
sendBS conn bs = do
write <- atomically . takeTMVar $ dBusWriteLock conn
write bs
atomically $ putTMVar (dBusWriteLock conn) write
callMethod :: Text.Text
-> ObjectPath
-> Text.Text
-> Text.Text
-> [SomeDBusValue]
-> [Flag]
-> DBusConnection
-> IO (STM (Either [SomeDBusValue] SomeDBusValue))
callMethod dest path interface member args flags conn = do
serial <- atomically $ dBusCreateSerial conn
ref <- newEmptyTMVarIO
rSlot <- newTVarIO ()
mkWeak rSlot (connectionAliveRef conn) Nothing
addFinalizer rSlot (finalizeSlot serial)
slot <- atomically $ do
modifyTVar (dBusAnswerSlots conn) (Map.insert serial $ putTMVar ref)
return ref
let bs = methodCall serial dest path interface member args flags
sendBS conn bs
return $ readTMVar slot <* readTVar rSlot
where
finalizeSlot s = do
atomically $ modifyTVar (dBusAnswerSlots conn)
(Map.delete s)
getAnswer :: IO (STM b) -> IO b
getAnswer = (atomically =<<)
callMethod' :: (SingI (RepType a), Representable a, MonadThrow m, MonadIO m) =>
Text.Text
-> ObjectPath
-> Text.Text
-> Text.Text
-> [SomeDBusValue]
-> [Flag]
-> DBusConnection
-> m a
callMethod' dest path interface member args flags conn = do
ret <- liftIO . getAnswer
$ callMethod dest path interface member args flags conn
case ret of
Left e -> throwM $ MethodErrorMessage e
Right r -> case fromRep =<< dbusValue r of
Nothing -> throwM $ MethodSignatureMissmatch r
Just x -> return x