private void GenerateRpcExecuteInformation(TypeBuilder typeBuilder, ImplementationRequest request,
MethodGenerationContext generationContext, MethodInfo methodInfo, Attribute[] attributes, HttpMethod method)
{
var fieldName = "EasyRpcInfo_" + methodInfo.Name;
generationContext.ExecutionInfoField =
typeBuilder.DefineField(fieldName, typeof(RpcExecuteInformation), FieldAttributes.Static | FieldAttributes.Public);
generationContext.ExecuteInformation = new RpcExecuteInformation
{
Method = method,
ClientProvider = request.ClientProvider,
Serializer = request.DefaultSerializer
};
generationContext.GenerationContext.FinalizeTypeActions.Add(t =>
{
var field = t.GetField(fieldName, BindingFlags.Static | BindingFlags.Public);
if (field == null)
{
throw new Exception($"Could not locate static field {fieldName} on {t.Name} for interface {methodInfo.DeclaringType?.Name}.{methodInfo.Name}");
}
field.SetValue(null, generationContext.ExecuteInformation);
});
}
private void PopulateGenerationContext(TypeBuilder typeBuilder, ImplementationRequest request, MethodGenerationContext generationContext, MethodInfo methodInfo, Attribute[] attributes)
{
HttpMethod method = HttpMethod.Post;
if (request.ExposeDefaultMethod == ExposeDefaultMethod.PostOnly)
{
var classNameString = methodInfo.DeclaringType?.Name;
var methodNameString = methodInfo.Name;
if (request.NamingConventionService != null)
{
classNameString = request.NamingConventionService.GetNameForType(methodInfo.DeclaringType);
methodNameString = request.NamingConventionService.GetMethodName(methodInfo);
}
generationContext.PathTemplate = request.BasePath + classNameString + "/" + methodNameString;
generationContext.BodyParameters = new List <ParameterInfo>();
generationContext.BodyParameters.AddRange(methodInfo.GetParameters());
}
else
{
throw new NotImplementedException();
}
GenerateRpcExecuteInformation(typeBuilder, request, generationContext, methodInfo, attributes, method);
}
private void GenerateMethodAsDefaultExpose(TypeBuilder typeBuilder, ImplementationRequest request,
MethodGenerationContext generationContext, MethodInfo methodInfo, Attribute[] attributes)
{
PopulateGenerationContext(typeBuilder, request, generationContext, methodInfo, attributes);
GenerateMethodImplementation(typeBuilder, request, generationContext, methodInfo, attributes);
}
protected virtual TypeBuilder CreateTypeBuilder(ImplementationRequest request,
GenerationContext generationContext)
{
var interfaceType = _moduleBuilder.DefineType("ClientInterfaceProxy" + _proxyCount, TypeAttributes.Public);
interfaceType.AddInterfaceImplementation(request.InterfaceType);
return(interfaceType);
}
private void GenerateConstructorIL(TypeBuilder typeBuilder, ImplementationRequest request, GenerationContext generationContext, ConstructorBuilder constructor)
{
var ilGenerator = constructor.GetILGenerator();
ilGenerator.Emit(OpCodes.Ldarg_0);
ilGenerator.Emit(OpCodes.Ldarg_1);
ilGenerator.Emit(OpCodes.Stfld, generationContext.RpcExecutionServiceField);
ilGenerator.Emit(OpCodes.Ret);
}
private void GenerateMethods(TypeBuilder typeBuilder, ImplementationRequest request,
GenerationContext generationContext)
{
foreach (var methodInfo in request.InterfaceType.GetMethods(BindingFlags.Instance | BindingFlags.Public))
{
var methodGenerationContext = new MethodGenerationContext(generationContext);
GenerateMethod(typeBuilder, request, methodGenerationContext, methodInfo);
}
}
private void GenerateConstructor(TypeBuilder typeBuilder, ImplementationRequest request,
GenerationContext generationContext)
{
generationContext.RpcExecutionServiceField = typeBuilder.DefineField("_rpcExecutionService", typeof(IRpcExecutionService), FieldAttributes.Private);
var constructor = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard,
new[] { typeof(IRpcExecutionService) });
constructor.DefineParameter(1, ParameterAttributes.None, "rpcExecutionService");
GenerateConstructorIL(typeBuilder, request, generationContext, constructor);
}
private void GenerateMethodImplementation(TypeBuilder typeBuilder, ImplementationRequest request, MethodGenerationContext generationContext, MethodInfo methodInfo, Attribute[] attributes)
{
var parameters = methodInfo.GetParameters();
var methodAttributes = MethodAttributes.Public |
MethodAttributes.HideBySig |
MethodAttributes.Virtual |
MethodAttributes.NewSlot;
var methodBuilder = typeBuilder.DefineMethod(methodInfo.Name, methodAttributes, CallingConventions.Standard,
methodInfo.ReturnType, parameters.Select(p => p.ParameterType).ToArray());
GenerateMethodImplementationIL(typeBuilder, request, generationContext, methodInfo, attributes, methodBuilder);
}
private void GenerateMethod(TypeBuilder typeBuilder, ImplementationRequest request, MethodGenerationContext generationContext, MethodInfo methodInfo)
{
var attributes = methodInfo.GetCustomAttributes <Attribute>(true).ToArray();
if (attributes.Any(a => a is IgnoreMethodAttribute))
{
return;
}
var pathAttribute = attributes.FirstOrDefault(a => a is IPathAttribute);
if (pathAttribute != null)
{
GenerateMethodFromPathAttribute(typeBuilder, request, generationContext, methodInfo, attributes, pathAttribute);
}
else
{
GenerateMethodAsDefaultExpose(typeBuilder, request, generationContext, methodInfo, attributes);
}
}
private void GenerateBodyVariable(TypeBuilder typeBuilder, ImplementationRequest request, ILGenerator il,
MethodGenerationContext generationContext,
MethodInfo methodInfo)
{
// single parameter is loaded directly from the parameter no need for a local variable
if (request.SingleParameterToBody &&
generationContext.BodyParameters.Count == 1)
{
return;
}
var serializedType =
_serializationTypeCreator.CreateSerializationTypeForMethod(generationContext.BodyParameters);
var bodyVariable = il.DeclareLocal(serializedType);
generationContext.BodyVariable = bodyVariable;
var constructor = serializedType.GetConstructor(new Type[0]);
il.Emit(OpCodes.Newobj, constructor);
il.Emit(OpCodes.Stloc, generationContext.BodyVariable);
foreach (var bodyParameter in generationContext.BodyParameters)
{
var propertyInfo = serializedType.GetProperty(bodyParameter.Name);
var setMethod = propertyInfo?.GetSetMethod();
if (setMethod == null)
{
// should never get here as the type is auto generated
throw new Exception($"Could not find set method on serialized type {serializedType.Name} property {bodyParameter.Name}");
}
il.Emit(OpCodes.Ldloc, bodyVariable);
il.EmitLoadArg(bodyParameter.Position + 1);
il.EmitMethodCall(setMethod);
}
}
private void GenerateMethodImplementationIL(TypeBuilder typeBuilder, ImplementationRequest request,
MethodGenerationContext generationContext, MethodInfo methodInfo, Attribute[] attributes,
MethodBuilder methodBuilder)
{
var il = methodBuilder.GetILGenerator();
if (generationContext.UrlParameters != null &&
generationContext.UrlParameters.Count > 0)
{
throw new NotImplementedException();
}
if (generationContext.BodyParameters != null &&
generationContext.BodyParameters.Count > 0)
{
GenerateBodyVariable(typeBuilder, request, il, generationContext, methodInfo);
}
GenerateRpcExecutionMethodCall(generationContext, methodInfo, il);
il.Emit(OpCodes.Ret);
}
public Type GenerateImplementationForInterface(ImplementationRequest request)
{
lock (_lock)
{
_proxyCount++;
var generationContext = new GenerationContext();
var typeBuilder = CreateTypeBuilder(request, generationContext);
GenerateConstructor(typeBuilder, request, generationContext);
GenerateMethods(typeBuilder, request, generationContext);
var type = typeBuilder.CreateTypeInfo().AsType();
foreach (var finalizeTypeAction in generationContext.FinalizeTypeActions)
{
finalizeTypeAction(type);
}
return(type);
}
}
private void GenerateMethodFromPathAttribute(TypeBuilder typeBuilder, ImplementationRequest request,
MethodGenerationContext generationContext, MethodInfo methodInfo, Attribute[] attributes, Attribute pathAttribute)
{
}
