private void AddMethodCore <TRequest, TResponse>(
Method <TRequest, TResponse> method,
HttpRule httpRule,
string pattern,
string httpVerb,
string body,
string responseBody,
MethodDescriptor methodDescriptor)
where TRequest : class
where TResponse : class
{
try
{
if (!pattern.StartsWith('/'))
{
// This validation is consistent with grpc-gateway code generation.
// We should match their validation to be a good member of the eco-system.
throw new InvalidOperationException($"Path template must start with /: {pattern}");
}
var(invoker, metadata) = CreateModelCore <UnaryServerMethod <TService, TRequest, TResponse> >(
method.Name,
new[] { typeof(TRequest), typeof(ServerCallContext) },
httpVerb,
httpRule,
methodDescriptor);
var methodContext = global::Grpc.Shared.Server.MethodOptions.Create(new[] { _globalOptions, _serviceOptions });
var routePattern = RoutePatternFactory.Parse(pattern);
var routeParameterDescriptors = ServiceDescriptorHelpers.ResolveRouteParameterDescriptors(routePattern, methodDescriptor.InputType);
ServiceDescriptorHelpers.ResolveBodyDescriptor(body, methodDescriptor, out var bodyDescriptor, out var bodyFieldDescriptors, out var bodyDescriptorRepeated);
FieldDescriptor?responseBodyDescriptor = null;
if (!string.IsNullOrEmpty(responseBody))
{
responseBodyDescriptor = methodDescriptor.OutputType.FindFieldByName(responseBody);
if (responseBodyDescriptor == null)
{
throw new InvalidOperationException($"Couldn't find matching field for response body '{responseBody}' on {methodDescriptor.OutputType.Name}.");
}
}
var unaryInvoker = new UnaryServerMethodInvoker <TService, TRequest, TResponse>(invoker, method, methodContext, _serviceActivator);
var unaryServerCallHandler = new UnaryServerCallHandler <TService, TRequest, TResponse>(
unaryInvoker,
responseBodyDescriptor,
bodyDescriptor,
bodyDescriptorRepeated,
bodyFieldDescriptors,
routeParameterDescriptors);
_context.AddMethod <TRequest, TResponse>(method, routePattern, metadata, unaryServerCallHandler.HandleCallAsync);
}
catch (Exception ex)
{
throw new InvalidOperationException($"Error binding {method.Name} on {typeof(TService).Name} to HTTP API.", ex);
}
}
private ApiDescriptionGroupCollection GetCollection()
{
var descriptions = new List <ApiDescription>();
var endpoints = _endpointDataSource.Endpoints;
foreach (var endpoint in endpoints)
{
if (endpoint is RouteEndpoint routeEndpoint)
{
var grpcMetadata = endpoint.Metadata.GetMetadata <GrpcHttpMetadata>();
if (grpcMetadata != null)
{
var httpRule = grpcMetadata.HttpRule;
var methodDescriptor = grpcMetadata.MethodDescriptor;
if (ServiceDescriptorHelpers.TryResolvePattern(grpcMetadata.HttpRule, out var pattern, out var verb))
{
var apiDescription = new ApiDescription();
apiDescription.HttpMethod = verb;
apiDescription.ActionDescriptor = new ActionDescriptor
{
RouteValues = new Dictionary <string, string>
{
// Swagger uses this to group endpoints together.
// Group methods together using the service name.
["controller"] = methodDescriptor.Service.FullName
}
};
apiDescription.RelativePath = pattern.TrimStart('/');
apiDescription.SupportedRequestFormats.Add(new ApiRequestFormat {
MediaType = "application/json"
});
apiDescription.SupportedResponseTypes.Add(new ApiResponseType
{
ApiResponseFormats = { new ApiResponseFormat {
MediaType = "application/json"
} },
ModelMetadata = new GrpcModelMetadata(ModelMetadataIdentity.ForType(methodDescriptor.OutputType.ClrType)),
StatusCode = 200
});
var routeParameters = ServiceDescriptorHelpers.ResolveRouteParameterDescriptors(routeEndpoint.RoutePattern, methodDescriptor.InputType);
foreach (var routeParameter in routeParameters)
{
var field = routeParameter.Value.Last();
apiDescription.ParameterDescriptions.Add(new ApiParameterDescription
{
Name = routeParameter.Key,
ModelMetadata = new GrpcModelMetadata(ModelMetadataIdentity.ForType(MessageDescriptorHelpers.ResolveFieldType(field))),
Source = BindingSource.Path,
DefaultValue = string.Empty
});
}
ServiceDescriptorHelpers.ResolveBodyDescriptor(httpRule.Body, methodDescriptor, out var bodyDescriptor, out _, out _);
if (bodyDescriptor != null)
{
apiDescription.ParameterDescriptions.Add(new ApiParameterDescription
{
Name = "Input",
ModelMetadata = new GrpcModelMetadata(ModelMetadataIdentity.ForType(bodyDescriptor.ClrType)),
Source = BindingSource.Body
});
}
descriptions.Add(apiDescription);
}
}
}
}
var groups = new List <ApiDescriptionGroup>();
groups.Add(new ApiDescriptionGroup("Grpc", descriptions));
return(new ApiDescriptionGroupCollection(groups, 1));
}
