public void HandleMethodCall (MethodCall method_call)
{
Type type = obj.GetType ();
//object retObj = type.InvokeMember (msg.Member, BindingFlags.InvokeMethod, null, obj, MessageHelper.GetDynamicValues (msg));
//TODO: there is no member name mapping for properties etc. yet
MethodInfo mi = Mapper.GetMethod (type, method_call);
if (mi == null) {
conn.MaybeSendUnknownMethodError (method_call);
return;
}
object retObj = null;
try {
object[] inArgs = MessageHelper.GetDynamicValues (method_call.message, mi.GetParameters ());
retObj = mi.Invoke (obj, inArgs);
} catch (TargetInvocationException e) {
if (!method_call.message.ReplyExpected)
return;
Exception ie = e.InnerException;
//TODO: complete exception sending support
Error error = new Error (Mapper.GetInterfaceName (ie.GetType ()), method_call.message.Header.Serial);
error.message.Signature = new Signature (DType.String);
MessageWriter writer = new MessageWriter (Connection.NativeEndianness);
writer.connection = conn;
writer.Write (ie.Message);
error.message.Body = writer.ToArray ();
//TODO: we should be more strict here, but this fallback was added as a quick fix for p2p
if (method_call.Sender != null)
error.message.Header.Fields[FieldCode.Destination] = method_call.Sender;
conn.Send (error.message);
return;
}
if (method_call.message.ReplyExpected) {
/*
object[] retObjs;
if (retObj == null) {
retObjs = new object[0];
} else {
retObjs = new object[1];
retObjs[0] = retObj;
}
Message reply = ConstructReplyFor (method_call, retObjs);
*/
Message reply = MessageHelper.ConstructReplyFor (method_call, mi.ReturnType, retObj);
conn.Send (reply);
}
}
//this method walks the interface tree in an undefined manner and returns the first match, or if no matches are found, null
//the logic needs review and cleanup
//TODO: unify member name mapping as is already done with interfaces and args
public static MethodInfo GetMethod (Type type, MethodCall method_call)
{
foreach (MemberInfo member in Mapper.GetPublicMembers (type)) {
//this could be made more efficient by using the given interface name earlier and avoiding walking through all public interfaces
if (method_call.Interface != null)
if (GetInterfaceName (member) != method_call.Interface)
continue;
MethodInfo meth = null;
Type[] inTypes = null;
if (member is PropertyInfo) {
PropertyInfo prop = member as PropertyInfo;
MethodInfo getter = prop.GetGetMethod (false);
MethodInfo setter = prop.GetSetMethod (false);
if (getter != null && "Get" + prop.Name == method_call.Member) {
meth = getter;
inTypes = Type.EmptyTypes;
} else if (setter != null && "Set" + prop.Name == method_call.Member) {
meth = setter;
inTypes = new Type[] {prop.PropertyType};
}
} else {
meth = member as MethodInfo;
if (meth == null)
continue;
if (meth.Name != method_call.Member)
continue;
inTypes = Mapper.GetTypes (ArgDirection.In, meth.GetParameters ());
}
if (meth == null || inTypes == null)
continue;
Signature inSig = Signature.GetSig (inTypes);
if (inSig != method_call.Signature)
continue;
return meth;
}
return null;
}
public virtual void HandleMethodCall(MethodCall method_call)
{
Type type = obj.GetType ();
//object retObj = type.InvokeMember (msg.Member, BindingFlags.InvokeMethod, null, obj, MessageHelper.GetDynamicValues (msg));
//TODO: there is no member name mapping for properties etc. yet
// FIXME: Inefficient to do this on every call
MethodInfo mi = Mapper.GetMethod (type, method_call);
if (mi == null) {
conn.MaybeSendUnknownMethodError (method_call);
return;
}
MethodCaller2 mCaller;
if (!mCallers.TryGetValue (mi, out mCaller)) {
//mCaller = TypeImplementer.GenCaller (mi, obj);
mCaller = TypeImplementer.GenCaller2 (mi);
mCallers[mi] = mCaller;
}
Signature inSig, outSig;
TypeImplementer.SigsForMethod (mi, out inSig, out outSig);
Message msg = method_call.message;
MessageReader msgReader = new MessageReader (method_call.message);
MessageWriter retWriter = new MessageWriter ();
/*
MessageWriter retWriter = null;
if (msg.ReplyExpected)
retWriter = new MessageWriter ();
*/
Exception raisedException = null;
try {
//mCaller (msgReader, method_call.message, retWriter);
mCaller (obj, msgReader, method_call.message, retWriter);
} catch (Exception e) {
raisedException = e;
}
if (!msg.ReplyExpected)
return;
Message replyMsg;
if (raisedException == null) {
MethodReturn method_return = new MethodReturn (msg.Header.Serial);
replyMsg = method_return.message;
replyMsg.Body = retWriter.ToArray ();
replyMsg.Signature = outSig;
} else {
Error error;
// BusException allows precisely formatted Error messages.
BusException busException = raisedException as BusException;
if (busException != null)
error = method_call.CreateError (busException.ErrorName, busException.ErrorMessage);
else if (raisedException is ArgumentException && raisedException.TargetSite.Name == mi.Name) {
// Name match trick above is a hack since we don't have the resolved MethodInfo.
ArgumentException argException = (ArgumentException)raisedException;
using (System.IO.StringReader sr = new System.IO.StringReader (argException.Message)) {
error = method_call.CreateError ("org.freedesktop.DBus.Error.InvalidArgs", sr.ReadLine ());
}
} else
error = method_call.CreateError (Mapper.GetInterfaceName (raisedException.GetType ()), raisedException.Message);
replyMsg = error.message;
}
if (method_call.Sender != null)
replyMsg.Header[FieldCode.Destination] = method_call.Sender;
conn.Send (replyMsg);
}
public static Message ConstructDynamicReply (MethodCall method_call, MethodInfo mi, object retVal, object[] vals)
{
Type retType = mi.ReturnType;
MethodReturn method_return = new MethodReturn (method_call.message.Header.Serial);
Message replyMsg = method_return.message;
Signature outSig = Signature.GetSig (retType);
outSig += Signature.GetSig (Mapper.GetTypes (ArgDirection.Out, mi.GetParameters ()));
if (outSig != Signature.Empty) {
MessageWriter writer = new MessageWriter (Connection.NativeEndianness);
//first write the return value, if any
if (retType != null && retType != typeof (void))
writer.Write (retType, retVal);
//then write the out args
WriteDynamicValues (writer, mi.GetParameters (), vals);
replyMsg.Body = writer.ToArray ();
}
//TODO: we should be more strict here, but this fallback was added as a quick fix for p2p
if (method_call.Sender != null)
replyMsg.Header.Fields[FieldCode.Destination] = method_call.Sender;
replyMsg.Signature = outSig;
return replyMsg;
}
public static Message ConstructReply (MethodCall method_call, params object[] vals)
{
MethodReturn method_return = new MethodReturn (method_call.message.Header.Serial);
Message replyMsg = method_return.message;
Signature inSig = Signature.GetSig (vals);
if (vals != null && vals.Length != 0) {
MessageWriter writer = new MessageWriter (Connection.NativeEndianness);
foreach (object arg in vals)
writer.Write (arg.GetType (), arg);
replyMsg.Body = writer.ToArray ();
}
//TODO: we should be more strict here, but this fallback was added as a quick fix for p2p
if (method_call.Sender != null)
replyMsg.Header.Fields[FieldCode.Destination] = method_call.Sender;
replyMsg.Signature = inSig;
//replyMsg.WriteHeader ();
return replyMsg;
}
public static Message CreateUnknownMethodError (MethodCall method_call)
{
if (!method_call.message.ReplyExpected)
return null;
string errMsg = String.Format ("Method \"{0}\" with signature \"{1}\" on interface \"{2}\" doesn't exist", method_call.Member, method_call.Signature.Value, method_call.Interface);
Error error = new Error ("org.freedesktop.DBus.Error.UnknownMethod", method_call.message.Header.Serial);
error.message.Signature = new Signature (DType.String);
MessageWriter writer = new MessageWriter (Connection.NativeEndianness);
writer.Write (errMsg);
error.message.Body = writer.ToArray ();
//TODO: we should be more strict here, but this fallback was added as a quick fix for p2p
if (method_call.Sender != null)
error.message.Header.Fields[FieldCode.Destination] = method_call.Sender;
return error.message;
}
public object SendMethodCall (string iface, string member, string inSigStr, MessageWriter writer, Type retType, out Exception exception)
{
exception = null;
//TODO: don't ignore retVal, exception etc.
Signature inSig = String.IsNullOrEmpty (inSigStr) ? Signature.Empty : new Signature (inSigStr);
MethodCall method_call = new MethodCall (object_path, iface, member, bus_name, inSig);
Message callMsg = method_call.message;
callMsg.Body = writer.ToArray ();
//Invoke Code::
//TODO: complete out parameter support
/*
Type[] outParmTypes = Mapper.GetTypes (ArgDirection.Out, mi.GetParameters ());
Signature outParmSig = Signature.GetSig (outParmTypes);
if (outParmSig != Signature.Empty)
throw new Exception ("Out parameters not yet supported: out_signature='" + outParmSig.Value + "'");
*/
Type[] outTypes = new Type[1];
outTypes[0] = retType;
//we default to always requiring replies for now, even though unnecessary
//this is to make sure errors are handled synchronously
//TODO: don't hard code this
bool needsReply = true;
//if (mi.ReturnType == typeof (void))
// needsReply = false;
callMsg.ReplyExpected = needsReply;
callMsg.Signature = inSig;
if (!needsReply) {
conn.Send (callMsg);
return null;
}
#if PROTO_REPLY_SIGNATURE
if (needsReply) {
Signature outSig = Signature.GetSig (outTypes);
callMsg.Header.Fields[FieldCode.ReplySignature] = outSig;
}
#endif
Message retMsg = conn.SendWithReplyAndBlock (callMsg);
object retVal = null;
//handle the reply message
switch (retMsg.Header.MessageType) {
case MessageType.MethodReturn:
object[] retVals = MessageHelper.GetDynamicValues (retMsg, outTypes);
if (retVals.Length != 0)
retVal = retVals[retVals.Length - 1];
break;
case MessageType.Error:
//TODO: typed exceptions
Error error = new Error (retMsg);
string errMsg = String.Empty;
if (retMsg.Signature.Value.StartsWith ("s")) {
MessageReader reader = new MessageReader (retMsg);
errMsg = reader.ReadString ();
}
exception = new Exception (error.ErrorName + ": " + errMsg);
break;
default:
throw new Exception ("Got unexpected message of type " + retMsg.Header.MessageType + " while waiting for a MethodReturn or Error");
}
return retVal;
}
public void Invoke (MethodBase methodBase, string methodName, object[] inArgs, out object[] outArgs, out object retVal, out Exception exception)
{
outArgs = new object[0];
retVal = null;
exception = null;
MethodInfo mi = methodBase as MethodInfo;
if (mi != null && mi.IsSpecialName && (methodName.StartsWith ("add_") || methodName.StartsWith ("remove_"))) {
string[] parts = methodName.Split (new char[]{'_'}, 2);
string ename = parts[1];
Delegate dlg = (Delegate)inArgs[0];
ToggleSignal (Mapper.GetInterfaceName (mi), ename, dlg, parts[0] == "add");
return;
}
Type[] inTypes = Mapper.GetTypes (ArgDirection.In, mi.GetParameters ());
Signature inSig = Signature.GetSig (inTypes);
MethodCall method_call;
Message callMsg;
//build the outbound method call message
{
//this bit is error-prone (no null checking) and will need rewriting when DProxy is replaced
string iface = null;
if (mi != null)
iface = Mapper.GetInterfaceName (mi);
//map property accessors
//TODO: this needs to be done properly, not with simple String.Replace
//note that IsSpecialName is also for event accessors, but we already handled those and returned
if (mi != null && mi.IsSpecialName) {
methodName = methodName.Replace ("get_", "Get");
methodName = methodName.Replace ("set_", "Set");
}
method_call = new MethodCall (object_path, iface, methodName, bus_name, inSig);
callMsg = method_call.message;
if (inArgs != null && inArgs.Length != 0) {
MessageWriter writer = new MessageWriter (Connection.NativeEndianness);
writer.connection = conn;
for (int i = 0 ; i != inTypes.Length ; i++)
writer.Write (inTypes[i], inArgs[i]);
callMsg.Body = writer.ToArray ();
}
}
//TODO: complete out parameter support
/*
Type[] outParmTypes = Mapper.GetTypes (ArgDirection.Out, mi.GetParameters ());
Signature outParmSig = Signature.GetSig (outParmTypes);
if (outParmSig != Signature.Empty)
throw new Exception ("Out parameters not yet supported: out_signature='" + outParmSig.Value + "'");
*/
Type[] outTypes = new Type[1];
outTypes[0] = mi.ReturnType;
//we default to always requiring replies for now, even though unnecessary
//this is to make sure errors are handled synchronously
//TODO: don't hard code this
bool needsReply = true;
//if (mi.ReturnType == typeof (void))
// needsReply = false;
callMsg.ReplyExpected = needsReply;
callMsg.Signature = inSig;
if (!needsReply) {
conn.Send (callMsg);
return;
}
#if PROTO_REPLY_SIGNATURE
if (needsReply) {
Signature outSig = Signature.GetSig (outTypes);
callMsg.Header.Fields[FieldCode.ReplySignature] = outSig;
}
#endif
Message retMsg = conn.SendWithReplyAndBlock (callMsg);
//handle the reply message
switch (retMsg.Header.MessageType) {
case MessageType.MethodReturn:
object[] retVals = MessageHelper.GetDynamicValues (retMsg, outTypes);
if (retVals.Length != 0)
retVal = retVals[retVals.Length - 1];
break;
case MessageType.Error:
//TODO: typed exceptions
Error error = new Error (retMsg);
string errMsg = String.Empty;
if (retMsg.Signature.Value.StartsWith ("s")) {
MessageReader reader = new MessageReader (retMsg);
errMsg = reader.ReadString ();
}
exception = new Exception (error.ErrorName + ": " + errMsg);
break;
default:
throw new Exception ("Got unexpected message of type " + retMsg.Header.MessageType + " while waiting for a MethodReturn or Error");
}
return;
}
private void FetchUiaDbusNames ()
{
var busNames = new List<string> ();
IBus ibus = Bus.Session.GetObject<IBus> (DBusName,
new ObjectPath (DBusPath));
// Look for buses that contain DCI.IApplication
foreach (string busName in ibus.ListNames ()) {
// Reading introspection data hangs on some buses
// for unknown reasons, so we call Introspect
// asynchronously. Note that we are using
// internal dbus-sharp classes. The old
// behavior was to spin off threads, but this
// triggers a Mono bug on Fedora
// (BNC#628639/632133)
ObjectPath op = new ObjectPath (DC.Constants.ApplicationPath);
MethodCall methodCall = new MethodCall (op,
"org.freedesktop.DBus.Introspectable",
"Introspect", busName, Signature.Empty);
PendingCall pendingCall = Bus.Session.SendWithReply (methodCall.message);
pendingCall.Completed += (message) => {
MessageReader reader = new MessageReader (message);
string data = reader.ReadString ();
if (data.Contains (DC.Constants.ApplicationInterfaceName))
busNames.Add ((string)message.Header [FieldCode.Sender]);
};
}
Thread.Sleep (1000);
lock (uiaDbusNamesLock)
uiaDbusNames = busNames;
}
//TODO: merge this with the above method
public static Message ConstructReplyFor (MethodCall method_call, Type retType, object retVal)
{
MethodReturn method_return = new MethodReturn (method_call.message.Header.Serial);
Message replyMsg = method_return.message;
Signature inSig = Signature.GetSig (retType);
if (inSig != Signature.Empty) {
MessageWriter writer = new MessageWriter (Connection.NativeEndianness);
writer.Write (retType, retVal);
replyMsg.Body = writer.ToArray ();
}
//TODO: we should be more strict here, but this fallback was added as a quick fix for p2p
if (method_call.Sender != null)
replyMsg.Header.Fields[FieldCode.Destination] = method_call.Sender;
replyMsg.Signature = inSig;
//replyMsg.WriteHeader ();
return replyMsg;
}
//this method walks the interface tree in an undefined manner and returns the first match, or if no matches are found, null
//the logic needs review and cleanup
//TODO: unify member name mapping as is already done with interfaces and args
public static MethodInfo GetMethod(Type type, MethodCall method_call)
{
foreach (MemberInfo member in Mapper.GetPublicMembers(type))
{
//this could be made more efficient by using the given interface name earlier and avoiding walking through all public interfaces
if (method_call.Interface != null)
{
if (GetInterfaceName(member) != method_call.Interface)
{
continue;
}
}
MethodInfo meth = null;
Type[] inTypes = null;
if (member is PropertyInfo)
{
PropertyInfo prop = member as PropertyInfo;
MethodInfo getter = prop.GetGetMethod(false);
MethodInfo setter = prop.GetSetMethod(false);
if (getter != null && "Get" + prop.Name == method_call.Member)
{
meth = getter;
inTypes = Type.EmptyTypes;
}
else if (setter != null && "Set" + prop.Name == method_call.Member)
{
meth = setter;
inTypes = new Type[] { prop.PropertyType };
}
}
else
{
meth = member as MethodInfo;
if (meth == null)
{
continue;
}
if (meth.Name != method_call.Member)
{
continue;
}
inTypes = Mapper.GetTypes(ArgDirection.In, meth.GetParameters());
}
if (meth == null || inTypes == null)
{
continue;
}
Signature inSig = Signature.GetSig(inTypes);
if (inSig != method_call.Signature)
{
continue;
}
return(meth);
}
return(null);
}
//not particularly efficient and needs to be generalized
internal void HandleMethodCall(MethodCall method_call)
{
//TODO: Ping and Introspect need to be abstracted and moved somewhere more appropriate once message filter infrastructure is complete
//FIXME: these special cases are slightly broken for the case where the member but not the interface is specified in the message
if (method_call.Interface == "org.freedesktop.DBus.Peer" && method_call.Member == "Ping")
{
Message reply = MessageHelper.ConstructReply(method_call);
Send(reply);
return;
}
if (method_call.Interface == "org.freedesktop.DBus.Introspectable" && method_call.Member == "Introspect")
{
Introspector intro = new Introspector();
intro.root_path = method_call.Path;
intro.WriteStart();
//FIXME: do this properly
//this is messy and inefficient
List <string> linkNodes = new List <string> ();
int depth = method_call.Path.Decomposed.Length;
foreach (ObjectPath pth in RegisteredObjects.Keys)
{
if (pth.Value == (method_call.Path.Value))
{
ExportObject exo = (ExportObject)RegisteredObjects[pth];
intro.WriteType(exo.obj.GetType());
}
else
{
for (ObjectPath cur = pth; cur != null; cur = cur.Parent)
{
if (cur.Value == method_call.Path.Value)
{
string linkNode = pth.Decomposed[depth];
if (!linkNodes.Contains(linkNode))
{
intro.WriteNode(linkNode);
linkNodes.Add(linkNode);
}
}
}
}
}
intro.WriteEnd();
Message reply = MessageHelper.ConstructReply(method_call, intro.xml);
Send(reply);
return;
}
BusObject bo;
if (RegisteredObjects.TryGetValue(method_call.Path, out bo))
{
ExportObject eo = (ExportObject)bo;
eo.HandleMethodCall(method_call);
}
else
{
MaybeSendUnknownMethodError(method_call);
}
}
internal void HandleMessage(Message msg)
{
//TODO: support disconnection situations properly and move this check elsewhere
if (msg == null)
{
throw new ArgumentNullException("msg", "Cannot handle a null message; maybe the bus was disconnected");
}
{
object field_value;
if (msg.Header.Fields.TryGetValue(FieldCode.ReplySerial, out field_value))
{
uint reply_serial = (uint)field_value;
PendingCall pending;
if (pendingCalls.TryGetValue(reply_serial, out pending))
{
if (pendingCalls.Remove(reply_serial))
{
pending.Reply = msg;
}
return;
}
//we discard reply messages with no corresponding PendingCall
if (Protocol.Verbose)
{
Console.Error.WriteLine("Unexpected reply message received: MessageType='" + msg.Header.MessageType + "', ReplySerial=" + reply_serial);
}
return;
}
}
switch (msg.Header.MessageType)
{
case MessageType.MethodCall:
MethodCall method_call = new MethodCall(msg);
HandleMethodCall(method_call);
break;
case MessageType.Signal:
//HandleSignal (msg);
lock (Inbound)
Inbound.Enqueue(msg);
break;
case MessageType.Error:
//TODO: better exception handling
Error error = new Error(msg);
string errMsg = String.Empty;
if (msg.Signature.Value.StartsWith("s"))
{
MessageReader reader = new MessageReader(msg);
errMsg = reader.ReadString();
}
//throw new Exception ("Remote Error: Signature='" + msg.Signature.Value + "' " + error.ErrorName + ": " + errMsg);
//if (Protocol.Verbose)
Console.Error.WriteLine("Remote Error: Signature='" + msg.Signature.Value + "' " + error.ErrorName + ": " + errMsg);
break;
case MessageType.Invalid:
default:
throw new Exception("Invalid message received: MessageType='" + msg.Header.MessageType + "'");
}
}
public virtual void HandleMethodCall(MethodCall method_call)
{
Type type = obj.GetType();
//object retObj = type.InvokeMember (msg.Member, BindingFlags.InvokeMethod, null, obj, MessageHelper.GetDynamicValues (msg));
//TODO: there is no member name mapping for properties etc. yet
// FIXME: Inefficient to do this on every call
MethodInfo mi = Mapper.GetMethod(type, method_call);
if (mi == null)
{
conn.MaybeSendUnknownMethodError(method_call);
return;
}
MethodCaller2 mCaller;
if (!mCallers.TryGetValue(mi, out mCaller))
{
//mCaller = TypeImplementer.GenCaller (mi, obj);
mCaller = TypeImplementer.GenCaller2(mi);
mCallers[mi] = mCaller;
}
Signature inSig, outSig;
TypeImplementer.SigsForMethod(mi, out inSig, out outSig);
Message msg = method_call.message;
MessageReader msgReader = new MessageReader(method_call.message);
MessageWriter retWriter = new MessageWriter();
/*
* MessageWriter retWriter = null;
* if (msg.ReplyExpected)
* retWriter = new MessageWriter ();
*/
Exception raisedException = null;
try {
//mCaller (msgReader, method_call.message, retWriter);
mCaller(obj, msgReader, method_call.message, retWriter);
} catch (Exception e) {
raisedException = e;
}
if (!msg.ReplyExpected)
{
return;
}
Message replyMsg;
if (raisedException == null)
{
MethodReturn method_return = new MethodReturn(msg.Header.Serial);
replyMsg = method_return.message;
replyMsg.Body = retWriter.ToArray();
replyMsg.Signature = outSig;
}
else
{
Error error;
// BusException allows precisely formatted Error messages.
BusException busException = raisedException as BusException;
if (busException != null)
{
error = method_call.CreateError(busException.ErrorName, busException.ErrorMessage);
}
else if (raisedException is ArgumentException && raisedException.TargetSite.Name == mi.Name)
{
// Name match trick above is a hack since we don't have the resolved MethodInfo.
ArgumentException argException = (ArgumentException)raisedException;
using (System.IO.StringReader sr = new System.IO.StringReader(argException.Message)) {
error = method_call.CreateError("org.freedesktop.DBus.Error.InvalidArgs", sr.ReadLine());
}
}
else
{
error = method_call.CreateError(Mapper.GetInterfaceName(raisedException.GetType()), raisedException.Message);
}
replyMsg = error.message;
}
if (method_call.Sender != null)
{
replyMsg.Header[FieldCode.Destination] = method_call.Sender;
}
conn.Send(replyMsg);
}