gRpc transcoding is not working- unable to find annotation.proto and http.proto are thrown

[VenkateshSrini]

I'm trying to do gRpc Transcoding with .NET 7. I'm following the article here. I'm also referring to the sample implementation here. Ater I added the proto files (annotation.proto and http.proto) and include the annotations.proto to main proto file. I get the error
Rebuild started... 1>------ Rebuild All started: Project: CacheService, Configuration: Debug Any CPU ------ Restored C:\CarryCase\Venkatesh\M2c\grpc\net7\CacheService\CacheService.csproj (in 40 ms). 1>google/api/annotations.proto : error : File not found. 1>Protos/cache.proto(2,1): error : Import "google/api/annotations.proto" was not found or had errors. 1>Done building project "CacheService.csproj" -- FAILED. ========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ========== ========== Elapsed 00:00.428 ==========

The code is attached herewith. I have already referred to similar solutions at this link and this link . But still the issue is not resolved
net7.zip

[JamesNK]

Either move the Protos/google folder to google (i.e. the root of your project) or change the imports to Protos/google/api/annotations.proto

[VenkateshSrini]

@JamesNK ,
I have done the solution that you suggested that is to add Protos/google/api/annotation. I'm still getting similar errors. the error message is as below

Rebuild started...
1>------ Rebuild All started: Project: CacheService, Configuration: Debug Any CPU ------
Restored C:\CarryCase\Venkatesh\M2c\grpc\net7\CacheService\CacheService.csproj (in 58 ms).
1>Protos/google/api/http.proto(344,5): error : "CustomHttpPattern" is not defined.
1>Protos/google/api/annotations.proto(19,1): error : Import "Protos/google/api/http.proto" was not found or had errors.
1>Protos/google/api/annotations.proto(30,3): error : "HttpRule" is not defined.
1>Protos/cache.proto(2,1): error : Import "Protos/google/api/annotations.proto" was not found or had errors.
1>Done building project "CacheService.csproj" -- FAILED.

========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

========== Elapsed 00:00.687 ==========
I'm attaching the same code with this issue (net7.zip). It would be of immense help if you can fix
the same code and upload the same to the response. I would use it as a sample for my upcoming projects.
net7.zip

[VenkateshSrini]

@JamesNK did you get time to check the code I shared? Can you please help with this?

[JamesNK]

I got it working after some changes.

I changed the import in cache.proto:

import "Protos/google/api/annotations.proto";

And I change the import in annotations.proto:

import "Protos/google/api/http.proto";

And for some reason your http.proto was missing the message definition for CustomHttpPattern:

// A custom pattern is used for defining custom HTTP verb.
message CustomHttpPattern {
  // The name of this custom HTTP verb.
  string kind = 1;

  // The path matched by this custom verb.
  string path = 2;
}

I'm guessing there was a mistake when copying the file from https://github.com/dotnet/aspnetcore/blob/33e2bca8af250a5e9d31060cbe14bbbda23ce3a7/src/Grpc/JsonTranscoding/test/testassets/Sandbox/google/api/http.proto#L369-L376

[VenkateshSrini]

@JamesNK Thanks you very much. I have one more small doubt. When I have to share the proto files with the client then Should I send the protos folder fully as Zip file as the includes are also there? My second doubt is when generating the client should I remove the rest endpoints definition in proto or it will just be ignored

[JamesNK]

It's ignored.

[VenkateshSrini]

@JamesNK Thank you for your quick response. I'm planning to deploy this in Kubernetes. Does that mean the gRPC request will communicate in one port and grpc-transcoding will communicate in another? The gRpc communication port is specified below in Program.cs below
`builder.WebHost.ConfigureKestrel(webOptions =>
{

webOptions.ListenAnyIP(5275, kestrelOptions =>
{
    kestrelOptions.Protocols = Microsoft.AspNetCore.Server.Kestrel.Core.HttpProtocols.Http2;
});

});`

similarly is there an option for me to specify the port where the transcoding will work?

Should I change the above definition also to use Microsoft.AspNetCore.Server.Kestrel.Core.HttpProtocols.Http1AndHttp2? I want to avoid SSL negotiation issues

Do I need to expose two different ports in the Kubernetes pod so that both gRpc transcoding and gRPC service work? My intention is that all the in-cluster communication should be in gRPC and all external communication (outside the cluster via LB or node port) should be through gRpc Transcoding

[JamesNK]

Does that mean the gRPC request will communicate in one port and grpc-transcoding will communicate in another?

It is up to you. If you are ok with calling RESTful JSON methods over prenegotiated HTTP/2 then you can reuse one port for both.

Or add one that is Http1 only if you want to use HTTP/1.1.

[VenkateshSrini]

@JamesNK . Thanks you for your help. I have completed the sample and is available at. Please let me know your feedbacks