diff --git a/License.txt b/License.txt new file mode 100644 --- /dev/null +++ b/License.txt @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. 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Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/Makefile b/Makefile new file mode 100644 --- /dev/null +++ b/Makefile @@ -0,0 +1,18 @@ +HS_SOURCES=hs/DBus/Client.hs + +all: $(HS_SOURCES) + +%.tex: %.nw + noweave -delay "$<" | cpif "$@" + +hs/%.hs: dbus-client.nw hs/DBus + notangle -R"$*.hs" "$<" | cpif "$@" + +hs/DBus: + mkdir -p hs/DBus + +%.pdf: %.tex + xelatex "$<" + xelatex "$<" + +pdfs: dbus-client.pdf manual.pdf diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/dbus-client.cabal b/dbus-client.cabal new file mode 100644 --- /dev/null +++ b/dbus-client.cabal @@ -0,0 +1,34 @@ +name: dbus-client +version: 0.1 +synopsis: D-Bus client libraries +description: Connect and interact with the D-Bus IPC system. +license: GPL +license-file: License.txt +author: John Millikin +maintainer: jmillikin@gmail.com +build-type: Simple +cabal-version: >=1.6 +category: Network, Desktop +stability: experimental +bug-reports: mailto:jmillikin@gmail.com + +extra-source-files: + dbus-client.nw + Makefile + +source-repository head + type: darcs + location: http://patch-tag.com/r/jmillikin/dbus-client/pullrepo + +library + ghc-options: -Wall + hs-source-dirs: hs + + build-depends: + base >=3 && < 5 + , dbus-core >= 0.5 + , containers + , text + + exposed-modules: + DBus.Client diff --git a/dbus-client.nw b/dbus-client.nw new file mode 100644 --- /dev/null +++ b/dbus-client.nw @@ -0,0 +1,570 @@ + +% Copyright (C) 2009 John Millikin +% +% This program is free software: you can redistribute it and/or modify +% it under the terms of the GNU General Public License as published by +% the Free Software Foundation, either version 3 of the License, or +% any later version. +% +% This program is distributed in the hope that it will be useful, +% but WITHOUT ANY WARRANTY; without even the implied warranty of +% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +% GNU General Public License for more details. +% +% You should have received a copy of the GNU General Public License +% along with this program. If not, see . + +\documentclass[12pt]{article} + +\usepackage{color} +\usepackage{hyperref} +\usepackage{noweb} + +% Smaller margins +\usepackage[left=1.5cm,top=2cm,right=1.5cm,nohead,nofoot]{geometry} + +% Remove boxes from hyperlinks +\hypersetup{ + colorlinks, + linkcolor=blue, +} + +\makeindex + +\begin{document} + +\addcontentsline{toc}{section}{Contents} +\tableofcontents + +@ +\section{Introduction} + +This library provides a simplified, high-level interface for use by D-Bus +clients. It implements async operations, remote object proxies, and +local object exporting. + +All source code is licensed under the terms of the GNU GPL v3 or later. + +<>= +{- + Copyright (C) 2009 John Millikin + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . +-} + + +@ +\section{Clients} + +<>= +<> +{-# LANGUAGE OverloadedStrings #-} +module DBus.Client + ( <> + ) where +<> + +<>= +import qualified Control.Concurrent.MVar as MV +import qualified Data.Map as Map +import qualified DBus.Connection as C +import qualified DBus.Constants as Const +import qualified DBus.Message as M +import qualified DBus.Types as T + +<>= +type Callback = (M.ReceivedMessage -> IO ()) + +data Client = Client C.Connection + (MV.MVar (Map.Map M.Serial Callback)) + (MV.MVar (Map.Map T.ObjectPath Callback)) + (MV.MVar [Callback]) + +clientConnection :: Client -> C.Connection +clientConnection (Client x _ _ _) = x + +<>= + Client +, clientConnection + +<>= +mkClient :: IO (C.Connection, T.BusName) -> IO Client +mkClient getBus = do + (c, _) <- getBus + replies <- MV.newMVar Map.empty + exports <- MV.newMVar Map.empty + signals <- MV.newMVar [] + let client = Client c replies exports signals + <> + return client + +<>= +, mkClient + +<>= +send' :: M.Message a => C.Connection -> (M.Serial -> IO b) -> a + -> IO b +send' c f msg = C.send c f msg >>= \result -> case result of + Left x -> error $ show x + Right x -> return x + +@ +\section{Name reservation} + +@ A client can request a ``well-known'' name from the bus. This allows +messages sent to that name to be received by the client, without senders +being aware of which application is actually handling requests. + +<>= +data RequestNameFlag + = AllowReplacement + | ReplaceExisting + | DoNotQueue + deriving (Show) + +<>= +data RequestNameReply + = PrimaryOwner + | InQueue + | Exists + | AlreadyOwner + deriving (Show) + +<>= +data ReleaseNameReply + = Released + | NonExistent + | NotOwner + deriving (Show) + +<>= +, RequestNameFlag (..) +, RequestNameReply (..) +, ReleaseNameReply (..) + +@ All name requests are handled by the main bus service, which has names +provided by the {\tt DBus.Constants} module. + +<>= +dbus :: Proxy +dbus = Proxy (RemoteObject Const.dbusName Const.dbusPath) Const.dbusInterface + +@ There are only two methods of interest here, {\tt RequestName} and +{\tt ReleaseName}. + +<>= +request, release :: T.MemberName +request = T.mkMemberName' "RequestName" +release = T.mkMemberName' "ReleaseName" + +@ A name may be requested for any client, using the given flags. The bus's +reply will be returned, or an exception raised if the reply was invalid. + +<>= +requestName :: Client -> T.BusName -> [RequestNameFlag] -> IO RequestNameReply +requestName client name flags = do + returned <- callBlocking client dbus request [] + [ T.toVariant name + , T.toVariant . encodeFlags $ flags] + + let reply = M.messageBody returned !! 0 + case decodeRequestReply =<< T.fromVariant reply of + Just x -> return x + Nothing -> error $ "Unknown request name reply: " ++ + show reply + +<>= +, requestName + +@ Releasing a name is similar, except there's no flags for releasing a name. + +<>= +releaseName :: Client -> T.BusName -> IO ReleaseNameReply +releaseName client name = do + returned <- callBlocking client dbus release [] [T.toVariant name] + + let reply = M.messageBody returned !! 0 + case decodeReleaseReply =<< T.fromVariant reply of + Just x -> return x + Nothing -> error $ "Unknown release name reply: " ++ + show reply + +<>= +, releaseName + +<>= +import Data.Word (Word32) +import Data.Bits ((.|.)) + +<>= +encodeFlags :: [RequestNameFlag] -> Word32 +encodeFlags = foldr (.|.) 0 . map flagValue where + flagValue AllowReplacement = 0x1 + flagValue ReplaceExisting = 0x2 + flagValue DoNotQueue = 0x4 + +<>= +decodeRequestReply :: Word32 -> Maybe RequestNameReply +decodeRequestReply 1 = Just PrimaryOwner +decodeRequestReply 2 = Just InQueue +decodeRequestReply 3 = Just Exists +decodeRequestReply 4 = Just AlreadyOwner +decodeRequestReply _ = Nothing + +<>= +decodeReleaseReply :: Word32 -> Maybe ReleaseNameReply +decodeReleaseReply 1 = Just Released +decodeReleaseReply 2 = Just NonExistent +decodeReleaseReply 3 = Just NotOwner +decodeReleaseReply _ = Nothing + +@ +\section{Receiving messages} + +Each client runs a separate thread for receiving messages, and every callback +is called in a separate thread. This allows callbacks to perform long +computations without blocking receipt of other messages. + +<>= +import Control.Concurrent (forkIO) +import Control.Monad (forever) +import qualified Data.Set as Set + +<>= +forkIO $ forever (receiveMessages client) + +<>= +receiveMessages :: Client -> IO () +receiveMessages client@(Client c _ _ _) = do + received <- C.receive c + msg <- case received of + Left x -> error $ show x + Right x -> return x + case msg of + (M.ReceivedMethodCall _ _ _ ) -> gotMethodCall client msg + (M.ReceivedMethodReturn _ _ msg') -> gotReply client (M.methodReturnSerial msg') msg + (M.ReceivedError _ _ msg') -> gotReply client (M.errorSerial msg') msg + (M.ReceivedSignal _ _ _ ) -> gotSignal client msg + _ -> return () + +<>= +gotMethodCall :: Client -> M.ReceivedMessage -> IO () +gotMethodCall client@(Client _ _ mvar _) msg = do + objects <- MV.readMVar mvar + let M.ReceivedMethodCall _ _ call' = msg + case Map.lookup (M.methodCallPath call') objects of + Just x -> x msg + Nothing -> unknownMethod client msg + +<>= +unknownMethod :: Client -> M.ReceivedMessage -> IO () +unknownMethod client msg = send' c (const $ return ()) errorMsg where + M.ReceivedMethodCall serial sender _ = msg + c = clientConnection client + errorMsg = M.Error + Const.errorUnknownMethod + serial sender + (Set.fromList [M.NoReplyExpected, M.NoAutoStart]) + [] + +@ Method returns and errors both have a serial attached, which is used to +find the proper callback. If the callback cannot be found, no action will +be taken. + +<>= +import Data.Maybe (isJust, fromJust, isNothing) + +<>= +gotReply :: Client -> M.Serial -> M.ReceivedMessage -> IO () +gotReply (Client _ mvar _ _) serial msg = do + callback <- MV.modifyMVar mvar $ \callbacks -> let + x = Map.lookup serial callbacks + callbacks' = if isJust x + then Map.delete serial callbacks + else callbacks + in return (callbacks', x) + case callback of + Just x -> forkIO (x msg) >> return () + Nothing -> return () + +<>= +gotSignal :: Client -> M.ReceivedMessage -> IO () +gotSignal (Client _ _ _ mvar) msg = MV.withMVar mvar $ + mapM_ (\cb -> forkIO (cb msg)) + +@ \subsection{Signals} + +<>= +onSignal :: Client + -> (T.BusName -> M.Signal -> Bool) + -> (T.BusName -> M.Signal -> IO ()) + -> IO () +onSignal (Client _ _ _ mvar) test callback = MV.modifyMVar_ mvar addCallback where + addCallback callbacks = return $ callback' : callbacks + callback' (M.ReceivedSignal _ sender msg) = + if test (fromJust sender) msg + then callback (fromJust sender) msg + else return () + callback' _ = undefined + +<>= +signalFilter :: Maybe T.BusName -> Maybe T.ObjectPath -> Maybe T.InterfaceName + -> Maybe T.MemberName -> T.BusName -> M.Signal -> Bool +signalFilter sender path iface member sender' msg = all id + [ isNothing sender || sender == Just sender' + , isNothing path || path == Just (M.signalPath msg) + , isNothing iface || iface == Just (M.signalInterface msg) + , isNothing member || member == Just (M.signalMember msg) + ] + +<>= +, onSignal +, signalFilter + +@ +\section{Remote object proxies} + +<>= +, RemoteObject (..) +, Proxy (..) +, call +, callBlocking +, onSignalFrom + +<>= +data RemoteObject = RemoteObject T.BusName T.ObjectPath +data Proxy = Proxy RemoteObject T.InterfaceName + +@ \subsection{Method calls} + +<>= +call :: Client -> Proxy -> T.MemberName -> [M.Flag] -> [T.Variant] + -> (M.Error -> IO ()) + -> (M.MethodReturn -> IO ()) + -> IO () +call client proxy name flags body onError onReturn = let + Proxy (RemoteObject dest path) iface = proxy + Client bus mvar _ _ = client + msg = M.MethodCall path name (Just iface) (Just dest) + (Set.fromList flags) + body + + callback (M.ReceivedError _ _ z) = onError z + callback (M.ReceivedMethodReturn _ _ z) = onReturn z + callback _ = undefined + + addCallback s = MV.modifyMVar_ mvar $ \callbacks -> + return $ Map.insert s callback callbacks + in send' bus addCallback msg + +<>= +callBlocking :: Client -> Proxy -> T.MemberName -> [M.Flag] -> [T.Variant] + -> IO M.MethodReturn +callBlocking client proxy name flags body = do + mvar <- MV.newEmptyMVar + call client proxy name flags body + (MV.putMVar mvar . Left) + (MV.putMVar mvar . Right) + reply <- MV.takeMVar mvar + case reply of + Left x -> error (show x) + Right x -> return x + +@ \subsection{Signals} + +<>= +onSignalFrom :: Client -> Proxy -> T.MemberName -> (M.Signal -> IO ()) + -> IO () +onSignalFrom client proxy member io = onSignal client test io' where + Proxy (RemoteObject dest path) iface = proxy + test = signalFilter (Just dest) (Just path) (Just iface) + (Just member) + io' _ msg = io msg + +@ +\section{Exporting local objects} + +<>= +import qualified DBus.Introspection as I + +<>= +export client (T.mkObjectPath' "/") rootObject + +<>= +rootObject :: LocalObject +rootObject = LocalObject $ Map.fromList [(ifaceName, interface)] where + ifaceName = T.mkInterfaceName' "org.freedesktop.DBus.Introspectable" + memberName = T.mkMemberName' "Introspect" + inSig = T.mkSignature' "" + outSig = T.mkSignature' "s" + interface = Interface $ Map.fromList [(memberName, impl)] + + method = I.Method memberName [] [I.Parameter "xml" outSig] + iface = I.Interface ifaceName [method] [] [] + path = T.mkObjectPath' "/" + + impl = Method inSig outSig $ \call' -> do + let Client _ _ mvar _ = methodCallClient call' + paths <- fmap Map.keys $ MV.readMVar mvar + + let paths' = filter (/= path) paths + let Just xml = I.toXML $ I.Object path [iface] + [I.Object p [] [] | p <- paths'] + replyReturn call' [T.toVariant xml] + +<>= +, LocalObject (..) +, Member (..) +, Interface (..) +, MethodCall (..) +, export + +<>= +import qualified Data.Text.Lazy as TL + +<>= +newtype LocalObject = LocalObject (Map.Map T.InterfaceName Interface) +newtype Interface = Interface (Map.Map T.MemberName Member) +data Member + = Method T.Signature T.Signature (MethodCall -> IO ()) + | Signal T.Signature + +<>= +export :: Client -> T.ObjectPath -> LocalObject -> IO () +export client@(Client _ _ mvar _) path obj = MV.modifyMVar_ mvar $ + return . Map.insert path (onMethodCall client (addIntrospectable path obj)) + +<>= +addIntrospectable :: T.ObjectPath -> LocalObject -> LocalObject +addIntrospectable path (LocalObject ifaces) = LocalObject ifaces' where + ifaces' = Map.insertWith (\_ x -> x) name iface ifaces + name = T.mkInterfaceName' "org.freedesktop.DBus.Introspectable" + iface = Interface $ Map.fromList [(T.mkMemberName' "Introspect", impl)] + impl = Method (T.mkSignature' "") (T.mkSignature' "s") $ \call' -> do + let Just xml = I.toXML . introspect path . methodCallObject $ call' + replyReturn call' [T.toVariant xml] + +<>= +introspect :: T.ObjectPath -> LocalObject -> I.Object +introspect path obj = I.Object path interfaces [] where + LocalObject ifaceMap = obj + interfaces = map introspectIface (Map.toList ifaceMap) + + introspectIface :: (T.InterfaceName, Interface) -> I.Interface + introspectIface (name, iface) = I.Interface name methods signals [] where + Interface memberMap = iface + members = Map.toList memberMap + methods = concatMap introspectMethod members + signals = concatMap introspectSignal members + + introspectMethod :: (T.MemberName, Member) -> [I.Method] + introspectMethod (name, (Method inSig outSig _)) = [I.Method name + (map introspectParam (T.signatureTypes inSig)) + (map introspectParam (T.signatureTypes outSig))] + introspectMethod _ = [] + + introspectSignal :: (T.MemberName, Member) -> [I.Signal] + introspectSignal (name, (Signal sig)) = [I.Signal name + (map introspectParam (T.signatureTypes sig))] + introspectSignal _ = [] + + introspectParam = I.Parameter "" . T.mkSignature' . T.typeCode + +@ \subsection{Responding to method calls} + +<>= +data MethodCall = MethodCall + { methodCallObject :: LocalObject + , methodCallClient :: Client + , methodCallMethod :: Member + , methodCallSerial :: M.Serial + , methodCallSender :: Maybe T.BusName + , methodCallFlags :: Set.Set M.Flag + , methodCallBody :: [T.Variant] + } + +@ Technically method calls don't have to specify an interface if there's only +one available in the destination object, but that'll never be the case here, +so treat an unspecified interface as unknown. + +<>= +findMember :: M.MethodCall -> LocalObject -> Maybe Member +findMember call' (LocalObject ifaces) = do + iface <- M.methodCallInterface call' + Interface members <- Map.lookup iface ifaces + Map.lookup (M.methodCallMember call') members + +<>= +onMethodCall :: Client -> LocalObject -> M.ReceivedMessage -> IO () +onMethodCall client obj msg = do + let M.ReceivedMethodCall serial sender call' = msg + sigStr = TL.concat . map (T.typeCode . T.variantType) + . M.methodCallBody $ call' + sig = T.mkSignature' sigStr + + case findMember call' obj of + Just method@(Method inSig _ x) -> let + call'' = MethodCall obj client method + serial sender + (M.methodCallFlags call') + (M.methodCallBody call') + invalidArgs = replyError call'' Const.errorInvalidArgs [] + in if inSig == sig + then x call'' + else invalidArgs + _ -> unknownMethod client msg + + +<>= +replyReturn :: MethodCall -> [T.Variant] -> IO () +replyReturn call' body = reply where + c = clientConnection . methodCallClient $ call' + replyInvalid = M.Error + Const.errorFailed + (methodCallSerial call') + (methodCallSender call') + (Set.fromList [M.NoReplyExpected, M.NoAutoStart]) + [T.toVariant $ TL.pack "Method return didn't match signature."] + + replyValid = M.MethodReturn + (methodCallSerial call') + (methodCallSender call') + (Set.fromList [M.NoReplyExpected, M.NoAutoStart]) + body + + sendReply :: M.Message a => a -> IO () + sendReply = send' c (const $ return ()) + + sigStr = TL.concat . map (T.typeCode . T.variantType) $ body + (Method _ outSig _) = methodCallMethod call' + reply = if T.mkSignature sigStr == Just outSig + then sendReply replyValid + else sendReply replyInvalid + +<>= +replyError :: MethodCall -> T.ErrorName -> [T.Variant] -> IO () +replyError call' name body = send' c (const $ return ()) reply where + c = clientConnection . methodCallClient $ call' + reply = M.Error + name + (methodCallSerial call') + (methodCallSender call') + (Set.fromList [M.NoReplyExpected, M.NoAutoStart]) + body + +<>= +, replyReturn +, replyError + +@ \end{document} diff --git a/hs/DBus/Client.hs b/hs/DBus/Client.hs new file mode 100644 --- /dev/null +++ b/hs/DBus/Client.hs @@ -0,0 +1,415 @@ +{- + Copyright (C) 2009 John Millikin + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . +-} + + +{-# LANGUAGE OverloadedStrings #-} +module DBus.Client + ( Client + , clientConnection + + , mkClient + + , RequestNameFlag (..) + , RequestNameReply (..) + , ReleaseNameReply (..) + + , requestName + + , releaseName + + , onSignal + , signalFilter + + , RemoteObject (..) + , Proxy (..) + , call + , callBlocking + , onSignalFrom + + , LocalObject (..) + , Member (..) + , Interface (..) + , MethodCall (..) + , export + + , replyReturn + , replyError + + ) where +import qualified Control.Concurrent.MVar as MV +import qualified Data.Map as Map +import qualified DBus.Connection as C +import qualified DBus.Constants as Const +import qualified DBus.Message as M +import qualified DBus.Types as T + +import Data.Word (Word32) +import Data.Bits ((.|.)) + +import Control.Concurrent (forkIO) +import Control.Monad (forever) +import qualified Data.Set as Set + +import Data.Maybe (isJust, fromJust, isNothing) + +import qualified DBus.Introspection as I + +import qualified Data.Text.Lazy as TL + + +type Callback = (M.ReceivedMessage -> IO ()) + +data Client = Client C.Connection + (MV.MVar (Map.Map M.Serial Callback)) + (MV.MVar (Map.Map T.ObjectPath Callback)) + (MV.MVar [Callback]) + +clientConnection :: Client -> C.Connection +clientConnection (Client x _ _ _) = x + +mkClient :: IO (C.Connection, T.BusName) -> IO Client +mkClient getBus = do + (c, _) <- getBus + replies <- MV.newMVar Map.empty + exports <- MV.newMVar Map.empty + signals <- MV.newMVar [] + let client = Client c replies exports signals + forkIO $ forever (receiveMessages client) + + export client (T.mkObjectPath' "/") rootObject + + return client + +send' :: M.Message a => C.Connection -> (M.Serial -> IO b) -> a + -> IO b +send' c f msg = C.send c f msg >>= \result -> case result of + Left x -> error $ show x + Right x -> return x + +data RequestNameFlag + = AllowReplacement + | ReplaceExisting + | DoNotQueue + deriving (Show) + +data RequestNameReply + = PrimaryOwner + | InQueue + | Exists + | AlreadyOwner + deriving (Show) + +data ReleaseNameReply + = Released + | NonExistent + | NotOwner + deriving (Show) + +dbus :: Proxy +dbus = Proxy (RemoteObject Const.dbusName Const.dbusPath) Const.dbusInterface + +request, release :: T.MemberName +request = T.mkMemberName' "RequestName" +release = T.mkMemberName' "ReleaseName" + +requestName :: Client -> T.BusName -> [RequestNameFlag] -> IO RequestNameReply +requestName client name flags = do + returned <- callBlocking client dbus request [] + [ T.toVariant name + , T.toVariant . encodeFlags $ flags] + + let reply = M.messageBody returned !! 0 + case decodeRequestReply =<< T.fromVariant reply of + Just x -> return x + Nothing -> error $ "Unknown request name reply: " ++ + show reply + +releaseName :: Client -> T.BusName -> IO ReleaseNameReply +releaseName client name = do + returned <- callBlocking client dbus release [] [T.toVariant name] + + let reply = M.messageBody returned !! 0 + case decodeReleaseReply =<< T.fromVariant reply of + Just x -> return x + Nothing -> error $ "Unknown release name reply: " ++ + show reply + +encodeFlags :: [RequestNameFlag] -> Word32 +encodeFlags = foldr (.|.) 0 . map flagValue where + flagValue AllowReplacement = 0x1 + flagValue ReplaceExisting = 0x2 + flagValue DoNotQueue = 0x4 + +decodeRequestReply :: Word32 -> Maybe RequestNameReply +decodeRequestReply 1 = Just PrimaryOwner +decodeRequestReply 2 = Just InQueue +decodeRequestReply 3 = Just Exists +decodeRequestReply 4 = Just AlreadyOwner +decodeRequestReply _ = Nothing + +decodeReleaseReply :: Word32 -> Maybe ReleaseNameReply +decodeReleaseReply 1 = Just Released +decodeReleaseReply 2 = Just NonExistent +decodeReleaseReply 3 = Just NotOwner +decodeReleaseReply _ = Nothing + +receiveMessages :: Client -> IO () +receiveMessages client@(Client c _ _ _) = do + received <- C.receive c + msg <- case received of + Left x -> error $ show x + Right x -> return x + case msg of + (M.ReceivedMethodCall _ _ _ ) -> gotMethodCall client msg + (M.ReceivedMethodReturn _ _ msg') -> gotReply client (M.methodReturnSerial msg') msg + (M.ReceivedError _ _ msg') -> gotReply client (M.errorSerial msg') msg + (M.ReceivedSignal _ _ _ ) -> gotSignal client msg + _ -> return () + +gotMethodCall :: Client -> M.ReceivedMessage -> IO () +gotMethodCall client@(Client _ _ mvar _) msg = do + objects <- MV.readMVar mvar + let M.ReceivedMethodCall _ _ call' = msg + case Map.lookup (M.methodCallPath call') objects of + Just x -> x msg + Nothing -> unknownMethod client msg + +unknownMethod :: Client -> M.ReceivedMessage -> IO () +unknownMethod client msg = send' c (const $ return ()) errorMsg where + M.ReceivedMethodCall serial sender _ = msg + c = clientConnection client + errorMsg = M.Error + Const.errorUnknownMethod + serial sender + (Set.fromList [M.NoReplyExpected, M.NoAutoStart]) + [] + +gotReply :: Client -> M.Serial -> M.ReceivedMessage -> IO () +gotReply (Client _ mvar _ _) serial msg = do + callback <- MV.modifyMVar mvar $ \callbacks -> let + x = Map.lookup serial callbacks + callbacks' = if isJust x + then Map.delete serial callbacks + else callbacks + in return (callbacks', x) + case callback of + Just x -> forkIO (x msg) >> return () + Nothing -> return () + +gotSignal :: Client -> M.ReceivedMessage -> IO () +gotSignal (Client _ _ _ mvar) msg = MV.withMVar mvar $ + mapM_ (\cb -> forkIO (cb msg)) + +onSignal :: Client + -> (T.BusName -> M.Signal -> Bool) + -> (T.BusName -> M.Signal -> IO ()) + -> IO () +onSignal (Client _ _ _ mvar) test callback = MV.modifyMVar_ mvar addCallback where + addCallback callbacks = return $ callback' : callbacks + callback' (M.ReceivedSignal _ sender msg) = + if test (fromJust sender) msg + then callback (fromJust sender) msg + else return () + callback' _ = undefined + +signalFilter :: Maybe T.BusName -> Maybe T.ObjectPath -> Maybe T.InterfaceName + -> Maybe T.MemberName -> T.BusName -> M.Signal -> Bool +signalFilter sender path iface member sender' msg = all id + [ isNothing sender || sender == Just sender' + , isNothing path || path == Just (M.signalPath msg) + , isNothing iface || iface == Just (M.signalInterface msg) + , isNothing member || member == Just (M.signalMember msg) + ] + +data RemoteObject = RemoteObject T.BusName T.ObjectPath +data Proxy = Proxy RemoteObject T.InterfaceName + +call :: Client -> Proxy -> T.MemberName -> [M.Flag] -> [T.Variant] + -> (M.Error -> IO ()) + -> (M.MethodReturn -> IO ()) + -> IO () +call client proxy name flags body onError onReturn = let + Proxy (RemoteObject dest path) iface = proxy + Client bus mvar _ _ = client + msg = M.MethodCall path name (Just iface) (Just dest) + (Set.fromList flags) + body + + callback (M.ReceivedError _ _ z) = onError z + callback (M.ReceivedMethodReturn _ _ z) = onReturn z + callback _ = undefined + + addCallback s = MV.modifyMVar_ mvar $ \callbacks -> + return $ Map.insert s callback callbacks + in send' bus addCallback msg + +callBlocking :: Client -> Proxy -> T.MemberName -> [M.Flag] -> [T.Variant] + -> IO M.MethodReturn +callBlocking client proxy name flags body = do + mvar <- MV.newEmptyMVar + call client proxy name flags body + (MV.putMVar mvar . Left) + (MV.putMVar mvar . Right) + reply <- MV.takeMVar mvar + case reply of + Left x -> error (show x) + Right x -> return x + +onSignalFrom :: Client -> Proxy -> T.MemberName -> (M.Signal -> IO ()) + -> IO () +onSignalFrom client proxy member io = onSignal client test io' where + Proxy (RemoteObject dest path) iface = proxy + test = signalFilter (Just dest) (Just path) (Just iface) + (Just member) + io' _ msg = io msg + +rootObject :: LocalObject +rootObject = LocalObject $ Map.fromList [(ifaceName, interface)] where + ifaceName = T.mkInterfaceName' "org.freedesktop.DBus.Introspectable" + memberName = T.mkMemberName' "Introspect" + inSig = T.mkSignature' "" + outSig = T.mkSignature' "s" + interface = Interface $ Map.fromList [(memberName, impl)] + + method = I.Method memberName [] [I.Parameter "xml" outSig] + iface = I.Interface ifaceName [method] [] [] + path = T.mkObjectPath' "/" + + impl = Method inSig outSig $ \call' -> do + let Client _ _ mvar _ = methodCallClient call' + paths <- fmap Map.keys $ MV.readMVar mvar + + let paths' = filter (/= path) paths + let Just xml = I.toXML $ I.Object path [iface] + [I.Object p [] [] | p <- paths'] + replyReturn call' [T.toVariant xml] + +newtype LocalObject = LocalObject (Map.Map T.InterfaceName Interface) +newtype Interface = Interface (Map.Map T.MemberName Member) +data Member + = Method T.Signature T.Signature (MethodCall -> IO ()) + | Signal T.Signature + +export :: Client -> T.ObjectPath -> LocalObject -> IO () +export client@(Client _ _ mvar _) path obj = MV.modifyMVar_ mvar $ + return . Map.insert path (onMethodCall client (addIntrospectable path obj)) + +addIntrospectable :: T.ObjectPath -> LocalObject -> LocalObject +addIntrospectable path (LocalObject ifaces) = LocalObject ifaces' where + ifaces' = Map.insertWith (\_ x -> x) name iface ifaces + name = T.mkInterfaceName' "org.freedesktop.DBus.Introspectable" + iface = Interface $ Map.fromList [(T.mkMemberName' "Introspect", impl)] + impl = Method (T.mkSignature' "") (T.mkSignature' "s") $ \call' -> do + let Just xml = I.toXML . introspect path . methodCallObject $ call' + replyReturn call' [T.toVariant xml] + +introspect :: T.ObjectPath -> LocalObject -> I.Object +introspect path obj = I.Object path interfaces [] where + LocalObject ifaceMap = obj + interfaces = map introspectIface (Map.toList ifaceMap) + + introspectIface :: (T.InterfaceName, Interface) -> I.Interface + introspectIface (name, iface) = I.Interface name methods signals [] where + Interface memberMap = iface + members = Map.toList memberMap + methods = concatMap introspectMethod members + signals = concatMap introspectSignal members + + introspectMethod :: (T.MemberName, Member) -> [I.Method] + introspectMethod (name, (Method inSig outSig _)) = [I.Method name + (map introspectParam (T.signatureTypes inSig)) + (map introspectParam (T.signatureTypes outSig))] + introspectMethod _ = [] + + introspectSignal :: (T.MemberName, Member) -> [I.Signal] + introspectSignal (name, (Signal sig)) = [I.Signal name + (map introspectParam (T.signatureTypes sig))] + introspectSignal _ = [] + + introspectParam = I.Parameter "" . T.mkSignature' . T.typeCode + +data MethodCall = MethodCall + { methodCallObject :: LocalObject + , methodCallClient :: Client + , methodCallMethod :: Member + , methodCallSerial :: M.Serial + , methodCallSender :: Maybe T.BusName + , methodCallFlags :: Set.Set M.Flag + , methodCallBody :: [T.Variant] + } + +findMember :: M.MethodCall -> LocalObject -> Maybe Member +findMember call' (LocalObject ifaces) = do + iface <- M.methodCallInterface call' + Interface members <- Map.lookup iface ifaces + Map.lookup (M.methodCallMember call') members + +onMethodCall :: Client -> LocalObject -> M.ReceivedMessage -> IO () +onMethodCall client obj msg = do + let M.ReceivedMethodCall serial sender call' = msg + sigStr = TL.concat . map (T.typeCode . T.variantType) + . M.methodCallBody $ call' + sig = T.mkSignature' sigStr + + case findMember call' obj of + Just method@(Method inSig _ x) -> let + call'' = MethodCall obj client method + serial sender + (M.methodCallFlags call') + (M.methodCallBody call') + invalidArgs = replyError call'' Const.errorInvalidArgs [] + in if inSig == sig + then x call'' + else invalidArgs + _ -> unknownMethod client msg + + +replyReturn :: MethodCall -> [T.Variant] -> IO () +replyReturn call' body = reply where + c = clientConnection . methodCallClient $ call' + replyInvalid = M.Error + Const.errorFailed + (methodCallSerial call') + (methodCallSender call') + (Set.fromList [M.NoReplyExpected, M.NoAutoStart]) + [T.toVariant $ TL.pack "Method return didn't match signature."] + + replyValid = M.MethodReturn + (methodCallSerial call') + (methodCallSender call') + (Set.fromList [M.NoReplyExpected, M.NoAutoStart]) + body + + sendReply :: M.Message a => a -> IO () + sendReply = send' c (const $ return ()) + + sigStr = TL.concat . map (T.typeCode . T.variantType) $ body + (Method _ outSig _) = methodCallMethod call' + reply = if T.mkSignature sigStr == Just outSig + then sendReply replyValid + else sendReply replyInvalid + +replyError :: MethodCall -> T.ErrorName -> [T.Variant] -> IO () +replyError call' name body = send' c (const $ return ()) reply where + c = clientConnection . methodCallClient $ call' + reply = M.Error + name + (methodCallSerial call') + (methodCallSender call') + (Set.fromList [M.NoReplyExpected, M.NoAutoStart]) + body +