.NET Grpc unit test CallContext-CodePudding

I am using the packages Grpc.Core and ProtoBuf.Grpc because I want to use both: Code-First gRPC with gRPC ClientFactory. Now I have an interface of form Task<Response> MyMethod(Request request, CallContext context) with CallContext coming from ProtoBuf.Grpc.

In the implementation of the interface I get the authorized (calling) user like this:

var user = httpContext.User.Claims.Where(x => x.Type == JwtRegisteredClaimNames.Name).FirstOrDefault();

Now I want to unit test my implementation of MyMethod but I do not know how to create the correct context for CallContext with a test user.

How can I test my implementation MyMethod with a predefined user in the CallContext?

Edit:

It seems possible to create and pass an instance of CallContext by calling the constructor

public CallContext(object server, ServerCallContext context)

I can create the ServerCallContext object via TestServerCallContext.Create(), see here. However I do not know what to pass for object server. Does anyone have an example for me?

CodePudding user response：

For unit testing gRPC with authentication and user context the following approach was my solution:

public static ProtoBuf.Grpc.CallContext TestCallContext(Guid user)
{
    var serverCallContext = TestServerCallContext.Create(
                                            method: nameof(IGrpcGreetingService.Greeting)
                                        , host: "localhost"
                                        , deadline: DateTime.Now.AddMinutes(30)
                                        , requestHeaders: new Metadata()
                                        , cancellationToken: CancellationToken.None
                                        , peer: "10.0.0.25:5001"
                                        , authContext: null
                                        , contextPropagationToken: null
                                        , writeHeadersFunc: (metadata) => Task.CompletedTask
                                        , writeOptionsGetter: () => new WriteOptions()
                                        , writeOptionsSetter: (writeOptions) => { }
                                        );

    var claims = new[] {
            new Claim(JwtRegisteredClaimNames.Sub, "some subject"),
            new Claim(JwtRegisteredClaimNames.Iat, DateTime.UtcNow.ToString()),
            new Claim(JwtRegisteredClaimNames.Name, user.ToString())
        };
    var claimsIdentity = new ClaimsIdentity(claims);

    var httpContext = new DefaultHttpContext();
    httpContext.User = new ClaimsPrincipal(claimsIdentity);
    serverCallContext.UserState["__HttpContext"] = httpContext;

    return new ProtoBuf.Grpc.CallContext("", serverCallContext);
}

With arguments for TestServerCallContext.Create from here.

Maybe this can help somebody else save some hours or days :)