GRPC mappings are not created correctly when created through Admin API

[misiek150]

Describe the bug

It looks like mappings for GRPC call are not created correctly when created through __admin/mappings endpoint. It doesn't matter if we register proto at server level or pass its content to mapping response and request, directly. Created mapping miss some parts which causes requests to fail (returning 404 status code).

When proto is registered at server level following parts are not created despite the fact they are included in the JSON request for creating mappings:

• Mapping.ProtoDefinition
• Response.TrailingHeaders
• Response.ProtoBufMessageType

When proto is passed as text directly (for request and response) following parts are not created despite the fact they are included in the JSON request for creating mappings:

• Response.ProtoDefinition
• Response.TrailingHeaders
• Response.ProtoBufMessageType

Expected behavior:

Above parts of the mapping are created thus mapping works correctly and the same way as if they were created through code at server start.

Test to reproduce

Start server with below code, register attached proto, don't add any mappings, e.g.:

var urlGrpc = "grpc://*:9093/";
var urlGrpcSecure = "grpcs://*:9094/";
var urlHttp = "http://*:80/";
var urlHttpSecure = "https://*:443/";

        WireMockServerSettings settings = new WireMockServerSettings
        {
            UseHttp2 = true,
            Urls = [urlGrpc, urlGrpcSecure, urlHttp, urlHttpSecure],
            Logger = new WireMockConsoleLogger(),
            StartAdminInterface = true
        };

        _server = WireMockServer.Start(settings);
        
        string protosFolder = args[0];
        string[] filePaths = Directory.GetFiles(protosFolder);
        foreach (string filePath in filePaths)
        {
            _server.AddProtoDefinition(Path.GetFileNameWithoutExtension(filePath), File.ReadAllText(filePath));
        }
       
        Console.Out.WriteLine($"{DateTime.UtcNow} Press Ctrl+C to shut down");

Proto definition:

syntax = "proto3";
 
package greet;
 
// The greeting service definition.
service Greeter {
  // Sends a greeting
  rpc SayHello (HelloRequest) returns (HelloReply);
}
 
// The request message containing the user's name.
message HelloRequest {
  string name = 1;
}
 
// The response message containing the greetings
message HelloReply {
  string message = 1;
}

Register following mapping through __admin/mappings endpoint:

[
  {
    "Guid": "3c16e119-fe92-43cf-a006-260514569e06",
    "UpdatedAt": "2025-01-08T11:50:01.3475097Z",
    "Request": {
      "Methods": [
        "POST"
      ],
      "Body": {
        "Matcher": {
          "Name": "ProtoBufMatcher",
          "ProtoBufMessageType": "greet.HelloRequest"
        }
      }
    },
    "Response": {
      "BodyAsJson": {
        "message": "hello {{request.BodyAsJson.name}} {{request.method}}"
      },
      "UseTransformer": true,
      "TransformerType": "Handlebars",
      "TransformerReplaceNodeOptions": "EvaluateAndTryToConvert",
      "Headers": {
        "Content-Type": "application/grpc"
      },
      "TrailingHeaders": {
        "grpc-status": "0"
      },
      "ProtoBufMessageType": "greet.HelloReply"
    },
    "ProtoDefinition": "greet"
  }
]

Inspect mapping using __admin/mappings endpoint for missing parts of the mapping.

Sample code to get server working correctly (i.e. return proper response to client):

        _server
            .Given(Request.Create()
            .UsingPost()
            .WithBodyAsProtoBuf("greet.HelloRequest")
            .WithProtoDefinition("greet")
            .RespondWith(Response.Create()
            .WithHeader("Content-Type", "application/grpc")
            .WithTrailingHeader("grpc-status", "0")
            .WithBodyAsProtoBuf("greet.HelloReply", new { message = "hello {{request.BodyAsJson.name}} {{request.method}}" })
            .WithBodyAsProtoBuf(File.ReadAllText(filePaths.Where(x => Path.GetFileNameWithoutExtension(x).Equals("greet")).First()), "greet.HelloReply", new { message = "hello {{request.BodyAsJson.name}} {{request.method}}" })
             .WithTransformer());

__admin/mappings endpoint may be used to obtain JSON mappings, posted earlier in this post.

Other related info

In case there is any problem with the approach I take, or maybe there is some specific convention required in terms of JSON mapping I tried I am more than happy to be corrected.

[StefH]

@misiek150

Can you try preview 1.6.11-ci-19563 ?

https://github.com/WireMock-Net/WireMock.Net/wiki/MyGet-preview-versions

[misiek150]

Hmm I am not sure if there is still an issue or I am doing something wrong.

I switched to 1.6.11-ci-19563. I am using below proto:

syntax = "proto3";
 
package greet;
 
// The greeting service definition.
service Greeter {
  // Sends a greeting
  rpc SayHello (HelloRequest) returns (HelloReply);
}
 
// The request message containing the user's name.
message HelloRequest {
  string name = 1;
}
 
// The response message containing the greetings
message HelloReply {
  string message = 1;
}

and load it with "greet" ID like:

string protosFolder = args[0];
        string[] filePaths = Directory.GetFiles(protosFolder);
        foreach (string filePath in filePaths)
        {
            _server.AddProtoDefinition(Path.GetFileNameWithoutExtension(filePath), File.ReadAllText(filePath));
        }

Server configuration:

        _server
            .Given(Request.Create()
                .UsingPost()
                .WithBodyAsProtoBuf("greet.HelloRequest")
                )
            .WithProtoDefinition("greet")
            .RespondWith(Response.Create()
                .WithHeader("Content-Type", "application/grpc")
                .WithTrailingHeader("grpc-status", "0")
                .WithBodyAsProtoBuf("greet.HelloReply", new { message = "hello {{request.BodyAsJson.name}} {{request.method}}" })
                .WithTransformer());

I run it and I am able to get successful response from the servier using postman. Now, I am getting mapping via __admin/mappings:

[
  {
    "Guid": "e7154d4b-cd5e-4d6b-9383-c15e058c0535",
    "UpdatedAt": "2025-01-11T17:30:32.1365012Z",
    "Request": {
      "Methods": [
        "POST"
      ],
      "Body": {
        "Matcher": {
          "Name": "ProtoBufMatcher",
          "ProtoBufMessageType": "greet.HelloRequest"
        }
      }
    },
    "Response": {
      "BodyAsJson": {
        "message": "hello {{request.BodyAsJson.name}} {{request.method}}"
      },
      "UseTransformer": true,
      "TransformerType": "Handlebars",
      "TransformerReplaceNodeOptions": "EvaluateAndTryToConvert",
      "Headers": {
        "Content-Type": "application/grpc"
      },
      "TrailingHeaders": {
        "grpc-status": "0"
      },
      "ProtoBufMessageType": "greet.HelloReply"
    },
    "ProtoDefinition": "greet"
  }
]

I delete all the mappings, paste above JSON into file, then post it back to the server via __admin/mappings with curl curl -X POST --header "Content-Type: application/json" --data @C:\temp\WiremockMappings2.json http://localhost:80/__admin/mappings.

If I get mapping again using curl http://localhost:80/__admin/mappings I do see all the fields so the problem I initially described seems to be fixed. However, if I call server again using postman, I am constantly getting 404 error.

Can you try replicating above situation? Maybe I am doing some dumb mistake on my side. Hard to say as mapping itself looks fine.

[StefH]

@misiek150
I can replicate this error and it's fixed and I've added an extra unit test.

Can you test preview version 1.6.11-ci-19569 ?

[StefH]

@misiek150
Can you please try to check?