private static string generateMethodImplementation(MethodInfo methodInfo, string interfaceName)
{
if (!methodInfo.Name.EndsWith("Async"))
{
throw new InvalidOperationException($"The method '{methodInfo.Name}' does not end with 'Async'");
}
var callName = methodInfo.Name.Substring(0, methodInfo.Name.Length - "Async".Length);
var returnType = methodInfo.ReturnType;
var returnTypeString = BuildTypeString(returnType);
if (returnTypeString != "global::System.Threading.Tasks.Task" &&
!returnTypeString.StartsWith("global::System.Threading.Tasks.Task<"))
{
throw new InvalidOperationException($"The method '{methodInfo.Name}' does not return a Task type");
}
var isProperty = propertyName.IsMatch(callName);
isProperty &= methodInfo.GetCustomAttribute <DbusMethodAttribute>() == null;
var parameters = methodInfo.GetParameters();
if (isProperty)
{
if (callName.StartsWith("Get"))
{
if (parameters.Length == 0)
{
isProperty &= true;
}
else if (parameters[0].ParameterType == typeof(CancellationToken))
{
isProperty &= true;
}
else
{
isProperty = false;
}
}
else if (callName.StartsWith("Set"))
{
if (parameters.Length == 1 && parameters[0].ParameterType != typeof(CancellationToken))
{
isProperty &= true;
}
else if (parameters.Length == 2 && parameters[1].ParameterType == typeof(CancellationToken))
{
isProperty &= true;
}
else
{
isProperty = false;
}
}
}
var encoder = new EncoderGenerator("sendBody");
var cancellationTokenName = "default(global::System.Threading.CancellationToken)";
if (parameters.Length > 0 || isProperty)
{
if (isProperty)
{
encoder.Add($@"""{interfaceName}""", typeof(string));
encoder.Add($@"""{callName.Substring(3 /* "Get" or "Set" */)}""", typeof(string));
interfaceName = "org.freedesktop.DBus.Properties";
callName = callName.Substring(0, 3); // "Get" or "Set"
foreach (var parameter in parameters)
{
if (parameter.ParameterType == typeof(CancellationToken))
{
cancellationTokenName = parameter.Name !;
}
else
{
encoder.AddVariant(parameter.Name !, parameter.ParameterType);
}
}
}
else
{
foreach (var parameter in parameters)
{
if (parameter.ParameterType == typeof(CancellationToken))
{
cancellationTokenName = parameter.Name !;
}
else
{
encoder.Add(parameter.Name !, parameter.ParameterType);
}
}
}
}
string returnStatement;
var decoder = new DecoderGenerator("decoder", "receivedMessage");
if (returnType == typeof(Task))
{
returnStatement = "return;";
}
else if (isProperty)
{
// must be "Get"
decoder.Add("result", typeof(object), Indent + " ");
returnStatement = "return (" + BuildTypeString(returnType.GenericTypeArguments[0]) + ")result;";
}
else // Task<T>
{
decoder.Add("result", returnType.GenericTypeArguments[0], Indent + " ");
returnStatement = "return result;";
}
var createFunction = "";
if (returnType != typeof(Task))
{
createFunction = @"
" + BuildTypeString(methodInfo.ReturnType.GenericTypeArguments[0]) + @" decode(global::Dbus.Decoder decoder)
{
" + decoder.Result + @"
" + returnStatement + @"
}
";
}
return(@"
public async " + returnTypeString + @" " + methodInfo.Name + @"(" + string.Join(", ", methodInfo.GetParameters().Select(x => BuildTypeString(x.ParameterType) + " " + x.Name)) + @")
{
var sendBody = new global::Dbus.Encoder();
" + encoder.Result + @"
var receivedMessage = await connection.SendMethodCall(
this.path,
""" + interfaceName + @""",
""" + callName + @""",
this.destination,
sendBody,
""" + encoder.Signature + @""",
" + cancellationTokenName + @"
).ConfigureAwait(false);
" + (returnType == typeof(Task) ? "" : createFunction) + @"
using (receivedMessage)
{
receivedMessage.AssertSignature(""" + decoder.Signature + @""");
" + (returnType == typeof(Task) ? "return;" : "return decode(receivedMessage.Decoder);") + @"
}
}
");
}
public static (string name, string implementation) GenerateMethodProxy(MethodInfo method)
{
if (!method.Name.EndsWith("Async"))
{
throw new InvalidOperationException("Only method names ending in 'Async' are supported");
}
if (method.ReturnType != typeof(Task) && method.ReturnType.GetGenericTypeDefinition() != typeof(Task <>))
{
throw new InvalidOperationException("Only methods returning a Task type are supported");
}
var methodName = method.Name.Substring(0, method.Name.Length - "Async".Length);
var methodImplementation = new StringBuilder();
methodImplementation.Append(@"
private async global::System.Threading.Tasks.Task handle" + method.Name + @"(global::Dbus.MethodCallOptions methodCallOptions, global::Dbus.ReceivedMessage receivedMessage, global::System.Threading.CancellationToken cancellationToken)
{
");
var decoder = new DecoderGenerator("receivedMessage.Decoder", "receivedMessage");
var methodParameters = new List <string>();
foreach (var parameter in method.GetParameters())
{
if (parameter.ParameterType == typeof(CancellationToken))
{
methodParameters.Add("cancellationToken");
}
else
{
decoder.Add(parameter.Name !, parameter.ParameterType);
methodParameters.Add(parameter.Name !);
}
}
var encoder = new EncoderGenerator("sendBody");
if (method.ReturnType != typeof(Task)) // Task<T>
{
var returnType = method.ReturnType.GenericTypeArguments[0];
encoder.Add("methodResult", returnType, Indent);
}
methodImplementation.Append(Indent);
methodImplementation.AppendLine(@"receivedMessage.AssertSignature(""" + decoder.Signature + @""");");
methodImplementation.Append(decoder.Result);
methodImplementation.Append(Indent);
if (encoder.Signature != "")
{
methodImplementation.Append("var methodResult = ");
}
methodImplementation.Append("await target." + method.Name + "(");
methodImplementation.Append(string.Join(", ", methodParameters));
methodImplementation.AppendLine(");");
methodImplementation.Append(Indent);
methodImplementation.AppendLine("if (!methodCallOptions.ShouldSendReply)");
methodImplementation.Append(Indent);
methodImplementation.AppendLine(" return;");
methodImplementation.Append(Indent);
methodImplementation.AppendLine("var sendBody = new global::Dbus.Encoder();");
if (encoder.Signature != "")
{
methodImplementation.Append(encoder.Result);
}
methodImplementation.Append(Indent);
methodImplementation.AppendLine(@"await connection.SendMethodReturnAsync(methodCallOptions, sendBody, """ + encoder.Signature + @""", cancellationToken).ConfigureAwait(false);");
methodImplementation.Append(@"
}");
return(methodName, methodImplementation.ToString());
}