Grpc transcoding in .net 7 - cannot post repeated field

[victorsauter]

Hi,

I'm trying to use the new great feature "grpc json transcoding", but I'm getting an error when I try to pass to the body a repeated field.

My proto :

syntax = "proto3";

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

option csharp_namespace = "GrpcGreeter";

package greet;

// The greeting service definition.
service Greeter {
  rpc AddGreeting (AddRequest) returns (AddReply){
    option (google.api.http) = {
      post: "/greet"
      body: "greetings"
    };
  }
}

message AddRequest {
  repeated Greeting greetings = 1;
}

message AddReply {
  repeated Greeting greetings = 1;
}

message Greeting {
  string name = 1;
  string level = 2;
  string comment = 3;
}

The error :

So, if i understand correctly, it's not supported yet, am I right ?

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Document Details

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• ID: 2deac78a-8c57-7891-4bd0-8842f5e2af07
• Version Independent ID: 2deac78a-8c57-7891-4bd0-8842f5e2af07
• Content: Configure HTTP and JSON for gRPC JSON transcoding ASP.NET Core apps
• Content Source: aspnetcore/grpc/json-transcoding-binding.md
• Product: aspnet-core
• Technology: aspnetcore-grpc
• GitHub Login: @JamesNK
• Microsoft Alias: jamesnk

[JamesNK]

I think this is an issue in gRPC JSON transcoding. Transferred to dotnet/aspnetcore repo.

[JamesNK]

A bug prevents binding a JSON body to a repeating collection of messages. It was tested with primitive values (i.e. a collection of strings) but not a collection of messages.

This will be fixed in .NET 8. Will look to see if it can be also fixed in a .NET 7 servicing release.

[victorsauter]

Okay great ! Thanks a lot :)