public static void GenerateWrapperMethodPost(MethodInfo methodInfo, Type modelType, LambdaExpression lambda, TypeBuilder typeBuilder, FieldInfo delegateField, IDictionary <ParameterExpression, FieldBuilder> innerFields, DryvControllerGenerationContext context, DryvDynamicControllerOptions options)
{
var method = lambda.Type.GetMethod("Invoke");
var methodBuilder = ControllerMethodGenerator.CreateMethodBuilder(typeBuilder, methodInfo.Name, lambda.ReturnType, new[] { modelType }, context, options);
var parameterBuilder = methodBuilder.DefineParameter(1, ParameterAttributes.None, "model");
parameterBuilder.SetCustomAttribute(ControllerAttributeGenerator.CreateAttributeBuilder <FromBodyAttribute>());
ControllerAttributeGenerator.SetAttribute <HttpPostAttribute>(methodBuilder);
ControllerMethodGenerator.AddRoutingAttribute(methodBuilder, context, options);
var il = methodBuilder.GetILGenerator();
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, delegateField);
foreach (var parameter in lambda.Parameters)
{
if (innerFields.TryGetValue(parameter, out var field))
{
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, field);
}
else if (parameter.Type == modelType)
{
il.Emit(OpCodes.Ldarg_1);
}
}
il.Emit(OpCodes.Callvirt, method);
il.Emit(OpCodes.Ret);
}
private static MethodBuilder CreateMethodBuilder(TypeBuilder typeBuilder, string methodName, Type returnType, Type[] parameterTypes, DryvControllerGenerationContext context, DryvDynamicControllerOptions options)
{
var methodBuilder = typeBuilder.DefineMethod(methodName, MethodAttributes.Public, returnType, parameterTypes);
ControllerAttributeGenerator.AddCustomAttributes(context, options.MapActionFilters, methodBuilder.SetCustomAttribute);
return(methodBuilder);
}
public static void GenerateWrapperMethodGet(MethodInfo methodInfo, Type modelType, MethodCallExpression methodExpression, LambdaExpression lambda, TypeBuilder typeBuilder, FieldInfo delegateField, IDictionary <ParameterExpression, FieldBuilder> innerFields, DryvControllerGenerationContext context, DryvDynamicControllerOptions options)
{
var memberFinder = new ControllerGenerator.MemberFinder(modelType);
memberFinder.Visit(methodExpression);
var properties = memberFinder.FoundMemberExpressions.Select(e => e.Member).Distinct().OfType <PropertyInfo>().ToList();
var method = lambda.Type.GetMethod("Invoke");
var methodBuilder = CreateMethodBuilder(typeBuilder, methodInfo.Name, lambda.ReturnType, properties.Select(p => p.PropertyType).ToArray(), context, options);
var index = 1;
var parameterBuilders = properties.ToDictionary(
p => p,
p => methodBuilder.DefineParameter(index++, ParameterAttributes.None, p.Name));
ControllerAttributeGenerator.SetAttribute <HttpGetAttribute>(methodBuilder);
AddRoutingAttribute(methodBuilder, context, options);
var il = methodBuilder.GetILGenerator();
var modelVariable = il.DeclareLocal(modelType);
var ctor = modelType.GetConstructors().First(c => !c.GetParameters().Any());
il.Emit(OpCodes.Newobj, ctor);
index = 1;
foreach (var builder in parameterBuilders)
{
il.Emit(OpCodes.Dup);
il.Emit(OpCodes.Ldarg, index++);
il.Emit(OpCodes.Callvirt, builder.Key.SetMethod);
}
il.Emit(OpCodes.Stloc_S, modelVariable);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, delegateField);
foreach (var parameter in lambda.Parameters)
{
if (innerFields.TryGetValue(parameter, out var field))
{
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, field);
}
else if (parameter.Type == modelType)
{
il.Emit(OpCodes.Ldloc_S, modelVariable);
}
}
il.Emit(OpCodes.Callvirt, method);
il.Emit(OpCodes.Ret);
}
private static void AddRoutingAttribute(MethodBuilder methodBuilder, DryvControllerGenerationContext context, DryvDynamicControllerOptions options)
{
if (options.MapRouteTemplate == null)
{
return;
}
var template = options.MapRouteTemplate(context);
ControllerAttributeGenerator.SetAttribute <RouteAttribute>(methodBuilder, template);
}
public Assembly CreateControllerAssembly(MethodCallExpression methodExpression, Type modelType)
{
var methodInfo = methodExpression.Method;
var key = GetCacheKey(methodInfo);
return(Cache.GetOrAdd(key, _ =>
{
var assemblyIndex = ++assemblyCount;
var typeNameBase = $"DryvDynamic{assemblyIndex}";
var baseType = typeof(Controller);
var currentAssembly = Assembly.GetExecutingAssembly();
var assemblyName = new AssemblyName($"DryvDynamicAssembly{assemblyIndex}")
{
CodeBase = currentAssembly.CodeBase,
};
var assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndCollect);
var moduleBuilder = assemblyBuilder.DefineDynamicModule(assemblyName.Name);
var typeBuilder = moduleBuilder.DefineType($"{NameSpace}.{typeNameBase}Controller", TypeAttributes.Class | TypeAttributes.Public, baseType);
var context = new DryvControllerGenerationContext(typeBuilder, methodInfo);
ControllerAttributeGenerator.AddCustomAttributes(context, this.options.Value.MapControllerFilters, typeBuilder.SetCustomAttribute);
var parameters = FindParameters(methodExpression);
var modelParameter = parameters.Find(p => p.Type == modelType);
var lambda = Expression.Lambda(methodExpression, parameters);
var delegateField = typeBuilder.DefineField("_delegate", lambda.Type, FieldAttributes.Private | FieldAttributes.Static);
parameters.Remove(modelParameter);
var innerFields = parameters.ToDictionary(
p => p,
p => typeBuilder.DefineField(p.Name, p.Type, FieldAttributes.Private));
ControllerCtorGenerator.GenerateConstructor(typeBuilder, baseType, innerFields.Values.ToList());
if (this.options.Value.HttpMethod == DryvDynamicControllerMethods.Post)
{
ControllerMethodGenerator.GenerateWrapperMethodPost(methodInfo, modelType, lambda, typeBuilder, delegateField, innerFields, context, this.options.Value);
}
else
{
ControllerMethodGenerator.GenerateWrapperMethodGet(methodInfo, modelType, methodExpression, lambda, typeBuilder, delegateField, innerFields, context, this.options.Value);
}
var type = typeBuilder.CreateType();
var field = type.GetField("_delegate", BindingFlags.Static | BindingFlags.NonPublic);
Debug.Assert(field != null);
field.SetValue(null, lambda.Compile());
//var generator = new Lokad.ILPack.AssemblyGenerator();
//generator.GenerateAssembly(assemblyBuilder, $"EMIT.dll");
//Process.Start(new ProcessStartInfo
//{
// UseShellExecute = true,
// WindowStyle = ProcessWindowStyle.Normal,
// FileName = "dotnet",
// Arguments = $"ildasm EMIT.dll -o EMIT.ildasm --force",
//}).WaitForExit();
return assemblyBuilder;
}));
}
