private static void AddUnaryMethod <TRequest, TResponse>(
IServiceMethodBinder <TService> binder,
IMethod grpcMethod,
MethodInfo contractMethodDefinition,
IList <object> metadata,
MethodInfo channelMethod,
object channelInstance)
where TRequest : class
where TResponse : class
{
var method = (Method <TRequest, TResponse>)grpcMethod;
var handler = channelMethod.CreateDelegate <Func <TService, TRequest, ServerCallContext, Task <TResponse> > >(channelInstance);
binder.AddUnaryMethod(
method,
() => contractMethodDefinition,
metadata,
handler);
}
private static void AddServerStreamingMethod <TRequest, TResponseHeader, TResponse>(
IServiceMethodBinder <TService> binder,
IMethod grpcMethod,
MethodInfo contractMethodDefinition,
object?responseHeaderMarshaller,
IList <object> metadata,
MethodInfo channelMethod,
object channelInstance)
where TRequest : class
where TResponseHeader : class
{
var method = (Method <TRequest, Message <TResponse> >)grpcMethod;
var handler = channelMethod.CreateDelegate <Func <TService, TRequest, ServerCallContext, ValueTask <(TResponseHeader?, IAsyncEnumerable <TResponse>)> > >(channelInstance);
binder.AddServerStreamingMethod(
method,
() => contractMethodDefinition,
(Marshaller <TResponseHeader>?)responseHeaderMarshaller,
metadata,
handler);
}
public void Bind(IServiceMethodBinder <TService> binder)
{
var contract = EmitContractBuilder.CreateFactory(_contractType)(binder.MarshallerFactory);
var channelInstance = EmitServiceEndpointBuilder.CreateFactory(_channelType)();
var serviceType = typeof(TService);
foreach (var interfaceDescription in _description.Services)
{
foreach (var operation in interfaceDescription.Operations)
{
var message = operation.Message;
var channelMethod = _channelType.InstanceMethod(operation.OperationName);
var metadata = TryGetMethodMetadata(interfaceDescription.InterfaceType, message.Operation);
var grpcMethodMethod = (IMethod)_contractType.InstanceFiled(operation.GrpcMethodName).GetValue(contract);
object?requestHeaderMarshaller = null;
if (message.HeaderRequestType != null)
{
requestHeaderMarshaller = _contractType.InstanceFiled(operation.GrpcMethodInputHeaderName).GetValue(contract);
}
object?responseHeaderMarshaller = null;
if (message.HeaderResponseType != null)
{
responseHeaderMarshaller = _contractType.InstanceFiled(operation.GrpcMethodOutputHeaderName).GetValue(contract);
}
_logger?.LogDebug("Bind service method {0}.{1}.", serviceType.FullName, message.Operation.Name);
if (grpcMethodMethod.Type == MethodType.Unary)
{
var addMethod = _serviceBinderAddUnaryMethod
.MakeGenericMethod(message.RequestType, message.ResponseType)
.CreateDelegate <Action <IServiceMethodBinder <TService>, IMethod, MethodInfo, IList <object>, MethodInfo, object> >();
addMethod(binder, grpcMethodMethod, message.Operation, metadata, channelMethod, channelInstance);
}
else if (grpcMethodMethod.Type == MethodType.ClientStreaming)
{
var addMethod = _serviceBinderAddClientStreamingMethod
.MakeGenericMethod(
message.HeaderRequestType ?? typeof(Message),
message.RequestType.GenericTypeArguments[0],
message.ResponseType)
.CreateDelegate <Action <IServiceMethodBinder <TService>, IMethod, MethodInfo, object?, IList <object>, MethodInfo, object> >();
addMethod(binder, grpcMethodMethod, message.Operation, requestHeaderMarshaller, metadata, channelMethod, channelInstance);
}
else if (grpcMethodMethod.Type == MethodType.ServerStreaming)
{
var addMethod = _serviceBinderAddServerStreamingMethod
.MakeGenericMethod(
message.RequestType,
message.HeaderResponseType ?? typeof(Message),
message.ResponseType.GenericTypeArguments[0])
.CreateDelegate <Action <IServiceMethodBinder <TService>, IMethod, MethodInfo, object?, IList <object>, MethodInfo, object> >();
addMethod(binder, grpcMethodMethod, message.Operation, responseHeaderMarshaller, metadata, channelMethod, channelInstance);
}
else if (grpcMethodMethod.Type == MethodType.DuplexStreaming)
{
var addMethod = _serviceBinderAddDuplexStreamingMethod
.MakeGenericMethod(
message.HeaderRequestType ?? typeof(Message),
message.RequestType.GenericTypeArguments[0],
message.HeaderResponseType ?? typeof(Message),
message.ResponseType.GenericTypeArguments[0])
.CreateDelegate <Action <IServiceMethodBinder <TService>, IMethod, MethodInfo, object?, object?, IList <object>, MethodInfo, object> >();
addMethod(binder, grpcMethodMethod, message.Operation, requestHeaderMarshaller, responseHeaderMarshaller, metadata, channelMethod, channelInstance);
}
else
{
throw new NotImplementedException("{0} operation is not implemented.".FormatWith(grpcMethodMethod.Type));
}
}
}
}
