I have a .Net Core 3.1 Grpc application created using ServiceStack framework. ServiceStack provides a way to auto-generate .proto files through /types/proto endpoint. It internally invokes GrpcProtoGenerator class to generate .proto file. It also requires AppHost, IHostingEnvironment and other objects to generate it.
However, I want to manually invoke GrpcProtoGenerator class for file generation instead of invoking /types/proto endpoint, but it's throwing an error, saying IHostingEnvironment is null. Is there a way to manually invoke the class by providing all necessary objects?
A lot of ServiceStack Features especially ServiceStack Services require a fully initialized AppHost. You can checkout at GrpcTests for an example of how to initialize a grpc-enabled AppHost in code, after the AppHost is initialized you should then be able to invoke GrpcProtoGenerator manually.
This is what the /types/proto Service uses to generate the proto for all your gRPC Services:
var typesConfig = NativeTypesMetadata.GetConfig(request);
var metadataTypes = NativeTypesMetadata.GetMetadataTypes(Request, typesConfig);
var proto = new GrpcProtoGenerator(typesConfig).GetCode(metadataTypes, base.Request);
return proto;
The GrpcTests also shows examples of creating a proto for adhoc types:
static string GetServiceProto<T>()
=> GrpcConfig.TypeModel.GetSchema(MetaTypeConfig<T>.GetMetaType().Type, ProtoBuf.Meta.ProtoSyntax.Proto3);
var schema = GetServiceProto<CustomRequestDto>();
Assert.AreEqual(@"syntax = ""proto3"";
package ServiceStack.Extensions.Tests;
message CustomRequestDto {
int32 PageName = 42;
string Name = 105;
}
", schema);