private void ImplementSignal(SignalDescription signalDescription, bool isPropertiesChanged)
{
var method = _typeBuilder.ImplementInterfaceMethod(signalDescription.MethodInfo);
ILGenerator ilg = method.GetILGenerator();
// call Watch(...)
// BusObject (this)
ilg.Emit(OpCodes.Ldarg_0);
ilg.Emit(OpCodes.Castclass, s_dbusObjectProxyType);
// Interface
ilg.Emit(OpCodes.Ldstr, signalDescription.Interface.Name);
// Member
ilg.Emit(OpCodes.Ldstr, signalDescription.Name);
// Action<Exception>
if (signalDescription.HasOnError)
{
ilg.Emit(OpCodes.Ldarg_2);
}
else
{
ilg.Emit(OpCodes.Ldnull);
}
// Action/Action<>
ilg.Emit(OpCodes.Ldarg_1);
if (signalDescription.SignalType != null)
{
// ReadMethodDelegate
ilg.Emit(OpCodes.Ldnull);
ilg.Emit(OpCodes.Ldftn, ReadMethodFactory.CreateReadMethodForType(signalDescription.SignalType));
var readDelegateConstructor = s_readMethodDelegateGenericType.MakeGenericType(new[] { signalDescription.SignalType }).GetConstructors()[0];
ilg.Emit(OpCodes.Newobj, readDelegateConstructor);
// isPropertiesChanged
ilg.Emit(isPropertiesChanged ? OpCodes.Ldc_I4_1 : OpCodes.Ldc_I4_0);
// Watch
ilg.Emit(OpCodes.Call, s_watchNonVoidSignal.MakeGenericMethod(new[] { signalDescription.SignalType }));
}
else
{
// Watch
ilg.Emit(OpCodes.Call, s_watchVoidSignal);
}
ilg.Emit(OpCodes.Ret);
}
public InterfaceDescription(Type type, string name, IList <MethodDescription> methods, IList <SignalDescription> signals,
IList <PropertyDescription> properties, MethodDescription propertyGetMethod, MethodDescription propertyGetAllMethod, MethodDescription propertySetMethod,
SignalDescription propertiesChangedSignal)
{
Type = type;
Name = name;
_methods = methods;
_signals = signals;
GetAllPropertiesMethod = propertyGetAllMethod;
SetPropertyMethod = propertySetMethod;
GetPropertyMethod = propertyGetMethod;
PropertiesChangedSignal = propertiesChangedSignal;
_properties = properties;
foreach (var signal in Signals)
{
signal.Interface = this;
}
if (propertiesChangedSignal != null)
{
PropertiesChangedSignal.Interface = this;
}
foreach (var method in Methods)
{
method.Interface = this;
}
foreach (var method in new[] { GetPropertyMethod,
SetPropertyMethod,
GetAllPropertiesMethod })
{
if (method != null)
{
method.Interface = this;
}
}
}
private static void AddInterfaceDescription(Type type, DBusInterfaceAttribute interfaceAttribute, List <InterfaceDescription> interfaces)
{
if (interfaces.Any(interf => interf.Name == interfaceAttribute.Name))
{
throw new ArgumentException($"DBus interface {interfaceAttribute.Name} is inherited multiple times");
}
IList <MethodDescription> methods = null;
IList <SignalDescription> signals = null;
IList <PropertyDescription> properties = null;
MethodDescription propertyGetMethod = null;
MethodDescription propertySetMethod = null;
MethodDescription propertyGetAllMethod = null;
SignalDescription propertiesChangedSignal = null;
Type propertyType = interfaceAttribute.PropertyType;
Type elementType;
if (propertyType != null && ArgTypeInspector.InspectEnumerableType(propertyType, out elementType, isCompileTimeType: true) != ArgTypeInspector.EnumerableType.AttributeDictionary)
{
throw new ArgumentException($"Property type '{propertyType.FullName}' does not have the '{typeof(DictionaryAttribute).FullName}' attribute");
}
foreach (var member in type.GetMethods())
{
string memberName = member.ToString();
if (!member.Name.EndsWith("Async", StringComparison.Ordinal))
{
throw new ArgumentException($"{memberName} does not end with 'Async'");
}
var isSignal = member.Name.StartsWith("Watch", StringComparison.Ordinal);
if (isSignal)
{
if (member.ReturnType != s_signalReturnType)
{
throw new ArgumentException($"Signal {memberName} does not return 'Task<IDisposable>'");
}
var name = member.Name.Substring(5, member.Name.Length - 10);
if (name.Length == 0)
{
throw new ArgumentException($"Signal {memberName} has an empty name");
}
Signature?parameterSignature = null;
IList <ArgumentDescription> arguments = null;
var parameters = member.GetParameters();
var actionParameter = parameters.Length > 0 ? parameters[0] : null;
Type parameterType = null;
bool validActionParameter = false;
if (actionParameter != null)
{
if (actionParameter.ParameterType == s_exceptionActionType)
{
// actionParameter is missing
}
else if (actionParameter.ParameterType == s_emptyActionType)
{
validActionParameter = true;
}
else if (actionParameter.ParameterType.GetTypeInfo().IsGenericType &&
actionParameter.ParameterType.GetGenericTypeDefinition() == s_singleParameterActionType)
{
validActionParameter = true;
parameterType = actionParameter.ParameterType.GetGenericArguments()[0];
InspectParameterType(parameterType, actionParameter, out parameterSignature, out arguments);
}
}
if (parameters.Length > 0 && parameters[parameters.Length - 1].ParameterType == s_cancellationTokenType)
{
throw new NotSupportedException($"Signal {memberName} does not support cancellation. See https://github.com/tmds/Tmds.DBus/issues/15.");
}
var lastParameter = parameters.Length > 0 ? parameters[parameters.Length - 1] : null;
bool hasOnError = lastParameter?.ParameterType == s_exceptionActionType;
if (!validActionParameter || parameters.Length != 1 + (hasOnError ? 1 : 0))
{
throw new ArgumentException($"Signal {memberName} must accept an argument of Type 'Action'/'Action<>' and optional argument of Type 'Action<Exception>'");
}
var signal = new SignalDescription(member, name, actionParameter.ParameterType, parameterType, parameterSignature, arguments, hasOnError);
if (member.Name == interfaceAttribute.WatchPropertiesMethod)
{
if (propertiesChangedSignal != null)
{
throw new ArgumentException($"Multiple property changes signals are declared: {memberName}, {propertyGetMethod.MethodInfo.ToString()}");
}
propertiesChangedSignal = signal;
if (propertiesChangedSignal.SignalSignature != s_propertiesChangedSignature)
{
throw new ArgumentException($"PropertiesChanged signal {memberName} must accept an Action<T> where T is a struct with an IDictionary<string, object> and an string[] field");
}
}
else
{
signals = signals ?? new List <SignalDescription>();
signals.Add(signal);
}
}
else
{
var name = member.Name.Substring(0, member.Name.Length - 5);
if (name.Length == 0)
{
throw new ArgumentException($"DBus Method {memberName} has an empty name");
}
IList <ArgumentDescription> outArguments = null;
Signature?outSignature = null;
var taskParameter = member.ReturnType;
Type outType = null;
bool valid = false;
bool isGenericOut = false;
if (taskParameter != null)
{
if (taskParameter == s_emptyTaskType)
{
valid = true;
outType = null;
}
else if (taskParameter.GetTypeInfo().IsGenericType &&
taskParameter.GetGenericTypeDefinition() == s_parameterTaskType)
{
valid = true;
outType = taskParameter.GetGenericArguments()[0];
if (outType.IsGenericParameter)
{
outType = s_objectType;
isGenericOut = true;
}
InspectParameterType(outType, member.ReturnParameter, out outSignature, out outArguments);
}
}
if (!valid)
{
throw new ArgumentException($"DBus Method {memberName} does not return 'Task'/'Task<>'");
}
IList <ArgumentDescription> inArguments = null;
Signature?inSignature = null;
var parameters = member.GetParameters();
if (parameters.Length > 0 && parameters[parameters.Length - 1].ParameterType == s_cancellationTokenType)
{
throw new NotSupportedException($"DBus Method {memberName} does not support cancellation. See https://github.com/tmds/Tmds.DBus/issues/15.");
}
for (int i = 0; i < parameters.Length; i++)
{
var param = parameters[i];
var parameterType = param.ParameterType;
var paramSignature = Signature.GetSig(parameterType, isCompileTimeType: true);
if (inSignature == null)
{
inSignature = paramSignature;
}
else
{
inSignature = Signature.Concat(inSignature.Value, paramSignature);
}
inArguments = inArguments ?? new List <ArgumentDescription>();
var argumentAttribute = param.GetCustomAttribute <ArgumentAttribute>(false);
var argName = argumentAttribute != null ? argumentAttribute.Name : param.Name;
inArguments.Add(new ArgumentDescription(argName, paramSignature, parameterType));
}
var methodDescription = new MethodDescription(member, name, inArguments, inSignature, outType, isGenericOut, outSignature, outArguments);
if (member.Name == interfaceAttribute.GetPropertyMethod)
{
if (propertyGetMethod != null)
{
throw new ArgumentException($"Multiple property Get methods are declared: {memberName}, {propertyGetMethod.MethodInfo.ToString()}");
}
propertyGetMethod = methodDescription;
if ((propertyGetMethod.InSignature != Signature.StringSig) ||
(propertyGetMethod.OutSignature != Signature.VariantSig))
{
throw new ArgumentException($"Property Get method {memberName} must accept a 'string' parameter and return 'Task<object>'");
}
}
else if (member.Name == interfaceAttribute.GetAllPropertiesMethod)
{
if (propertyGetAllMethod != null)
{
throw new ArgumentException($"Multiple property GetAll are declared: {memberName}, {propertyGetAllMethod.MethodInfo.ToString()}");
}
propertyGetAllMethod = methodDescription;
if ((propertyGetAllMethod.InArguments.Count != 0) ||
(propertyGetAllMethod.OutSignature != s_getAllOutSignature))
{
throw new ArgumentException($"Property GetAll method {memberName} must accept no parameters and return 'Task<IDictionary<string, object>>'");
}
if (propertyType == null)
{
if (ArgTypeInspector.InspectEnumerableType(methodDescription.OutType, out elementType, isCompileTimeType: true) == ArgTypeInspector.EnumerableType.AttributeDictionary)
{
propertyType = methodDescription.OutType;
}
}
}
else if (member.Name == interfaceAttribute.SetPropertyMethod)
{
if (propertySetMethod != null)
{
throw new ArgumentException($"Multiple property Set are declared: {memberName}, {propertySetMethod.MethodInfo.ToString()}");
}
propertySetMethod = methodDescription;
if ((propertySetMethod.InArguments?.Count != 2 || propertySetMethod.InArguments[0].Type != s_stringType || propertySetMethod.InArguments[1].Type != s_objectType) ||
(propertySetMethod.OutArguments.Count != 0))
{
throw new ArgumentException($"Property Set method {memberName} must accept a 'string' and 'object' parameter and return 'Task'");
}
}
else
{
methods = methods ?? new List <MethodDescription>();
methods.Add(methodDescription);
}
}
}
if (propertyType != null)
{
var fields = propertyType.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
foreach (var field in fields)
{
string propertyName;
Type fieldType;
PropertyTypeInspector.InspectField(field, out propertyName, out fieldType);
var propertySignature = Signature.GetSig(fieldType, isCompileTimeType: true);
var propertyAccess = field.GetCustomAttribute <PropertyAttribute>()?.Access ?? PropertyAccess.ReadWrite;
var description = new PropertyDescription(propertyName, propertySignature, propertyAccess);
properties = properties ?? new List <PropertyDescription>();
properties.Add(description);
}
}
interfaces.Add(new InterfaceDescription(type, interfaceAttribute.Name, methods, signals, properties,
propertyGetMethod, propertyGetAllMethod, propertySetMethod, propertiesChangedSignal));
}
private MethodInfo GenSendSignal(SignalDescription signalDescription, bool isPropertiesChangedSignal)
{
var key = $"{signalDescription.Interface.Name}.{signalDescription.Name}";
var method = _typeBuilder.DefineMethod($"Emit{key}".Replace('.', '_'), MethodAttributes.Private, null,
signalDescription.SignalType == null ? Type.EmptyTypes : new[] { signalDescription.SignalType });
var ilg = method.GetILGenerator();
ilg.Emit(OpCodes.Ldarg_0);
if (isPropertiesChangedSignal)
{
ilg.Emit(OpCodes.Ldstr, "org.freedesktop.DBus.Properties");
ilg.Emit(OpCodes.Ldstr, "PropertiesChanged");
}
else
{
ilg.Emit(OpCodes.Ldstr, signalDescription.Interface.Name);
ilg.Emit(OpCodes.Ldstr, signalDescription.Name);
}
if (signalDescription.SignalType == null)
{
ilg.Emit(OpCodes.Call, s_emitVoidSignal);
}
else
{
// Signature
if (isPropertiesChangedSignal)
{
ilg.Emit(OpCodes.Ldstr, "sa{sv}as");
ilg.Emit(OpCodes.Newobj, s_signatureConstructor);
ilg.Emit(OpCodes.Newobj, s_nullableSignatureConstructor);
}
else if (signalDescription.SignalSignature.HasValue)
{
ilg.Emit(OpCodes.Ldstr, signalDescription.SignalSignature.Value.Value);
ilg.Emit(OpCodes.Newobj, s_signatureConstructor);
ilg.Emit(OpCodes.Newobj, s_nullableSignatureConstructor);
}
else
{
LocalBuilder signature = ilg.DeclareLocal(s_nullableSignatureType);
ilg.Emit(OpCodes.Ldloca_S, signature);
ilg.Emit(OpCodes.Initobj, s_nullableSignatureType);
ilg.Emit(OpCodes.Ldloc, signature);
}
// Writer
ilg.Emit(OpCodes.Newobj, s_messageWriterConstructor);
if (isPropertiesChangedSignal)
{
ilg.Emit(OpCodes.Dup);
ilg.Emit(OpCodes.Ldstr, signalDescription.Interface.Name);
ilg.Emit(OpCodes.Call, s_writerWriteString);
ilg.Emit(OpCodes.Dup);
ilg.Emit(OpCodes.Call, s_writerSetSkipNextStructPadding);
}
ilg.Emit(OpCodes.Dup);
ilg.Emit(OpCodes.Ldarg_1);
ilg.Emit(OpCodes.Call, WriteMethodFactory.CreateWriteMethodForType(signalDescription.SignalType, isCompileTimeType: true));
ilg.Emit(OpCodes.Call, s_emitNonVoidSignal);
}
ilg.Emit(OpCodes.Ret);
return(method);
}
