public static string GetMethodName(Type type)
{
if (MethodNames.TryGetValue(type, out var method))
{
return(method);
}
// Custom method
var attribute = MethodAttribute.From(type);
var handler = KnownHandlers.SelectMany(z => z)
.FirstOrDefault(z => z.InterfaceType == type || z.HandlerType == type || z.ParamsType == type);
if (handler != null)
{
return(handler.Method);
}
// TODO: Log unknown method name
if (attribute is null)
{
return(null);
}
MethodNames.TryAdd(type, attribute.Method);
return(attribute.Method);
}
static HandlerTypeDescriptorHelper()
{
try
{
KnownHandlers = AppDomain.CurrentDomain.GetAssemblies()
.SelectMany(
x => {
try
{
return(x.GetTypes());
}
catch
{
return(Enumerable.Empty <Type>());
}
}
)
.Where(z => (z.IsInterface || (z.IsClass && !z.IsAbstract)) && typeof(IJsonRpcHandler).IsAssignableFrom(z))
.Where(z => MethodAttribute.From(z) != null)
.Where(z => !z.Name.EndsWith("Manager")) // Manager interfaces are generally specializations around the handlers
.Select(GetMethodType)
.Distinct()
.ToLookup(x => MethodAttribute.From(x).Method)
.SelectMany(x => x.Select(z => new HandlerTypeDescriptor(z) as IHandlerTypeDescriptor))
.ToLookup(x => x.Method, StringComparer.Ordinal);
}
catch (Exception e)
{
throw new AggregateException("Failed", e);
}
}
internal static IEnumerable <IHandlerTypeDescriptor> GetDescriptors(IEnumerable <Assembly> assemblies) => assemblies.SelectMany(
x => {
try
{
return(x.GetTypes());
}
catch
{
return(Enumerable.Empty <Type>());
}
}
)
.Where(z => z.IsInterface || z.IsClass && !z.IsAbstract)
// running on mono this call can cause issues when scanning of the entire assembly.
.Where(
z => {
try
{
return(typeof(IJsonRpcHandler).IsAssignableFrom(z));
}
catch
{
return(false);
}
}
)
.Where(z => MethodAttribute.From(z) != null)
.Where(z => !z.Name.EndsWith("Manager")) // Manager interfaces are generally specializations around the handlers
.Select(HandlerTypeDescriptorHelper.GetMethodType)
.Distinct()
.ToLookup(x => MethodAttribute.From(x) !.Method)
public HandlerTypeDescriptor(Type handlerType)
{
var method = MethodAttribute.From(handlerType) !;
Method = method.Method;
Direction = method.Direction;
if (handlerType.IsGenericTypeDefinition && handlerType.IsPublic)
{
var parameter = handlerType.GetTypeInfo().GenericTypeParameters[0];
var constraints = parameter.GetGenericParameterConstraints();
if (constraints.Length == 1)
{
handlerType = handlerType.MakeGenericType(handlerType.GetTypeInfo().GenericTypeParameters[0].GetGenericParameterConstraints()[0]);
}
}
HandlerType = handlerType;
InterfaceType = HandlerTypeDescriptorHelper.GetHandlerInterface(handlerType);
// This allows for us to have derived types
// We are making the assumption that interface given here
// if a GTD will have a constraint on the first generic type parameter
// that is the real base type for this interface.
if (InterfaceType.IsGenericType)
{
ParamsType = InterfaceType.GetGenericArguments()[0];
}
HasParamsType = ParamsType != null;
IsNotification = handlerType
.GetInterfaces()
.Any(z => z.IsGenericType && typeof(IJsonRpcNotificationHandler <>).IsAssignableFrom(z.GetGenericTypeDefinition()));
IsRequest = !IsNotification;
var requestInterface = ParamsType?
.GetInterfaces()
.FirstOrDefault(x => x.IsGenericType && x.GetGenericTypeDefinition() == typeof(IRequest <>));
if (requestInterface != null)
{
ResponseType = requestInterface.GetGenericArguments()[0];
}
HasResponseType = ResponseType != null && ResponseType != typeof(Unit);
var processAttributes = HandlerType
.GetCustomAttributes(true)
.Concat(HandlerType.GetCustomAttributes(true))
.Concat(InterfaceType.GetInterfaces().SelectMany(x => x.GetCustomAttributes(true)))
.Concat(HandlerType.GetInterfaces().SelectMany(x => x.GetCustomAttributes(true)))
.OfType <ProcessAttribute>()
.ToArray();
RequestProcessType = processAttributes
.FirstOrDefault()?.Type;
}