Implementing interceptors and handling faults

gRPC interceptors are a way to perform additional processing during requests and responses and they can be injected at the client or service. They are often used for logging, monitoring, and validation.

Adding a client-side interceptor

Let’s add a client-side gRPC interceptor for logging:

1. In the Northwind.Grpc.Client.Mvc project, add a new folder named Interceptors.
2. In the Interceptors folder, add a new class file named ClientLoggingInterceptor.cs, and then add statements to define an interceptor, as shown in the following code:

   using Grpc.Core.Interceptors; // To use Interceptor and so on.
   using Grpc.Core; // To use AsyncUnaryCall<T>.
   namespace Northwind.Grpc.Client.Mvc.Interceptors;
   public class ClientLoggingInterceptor : Interceptor
   {
     private readonly ILogger _logger;
     public ClientLoggingInterceptor(ILoggerFactory loggerFactory)
     {
       _logger = loggerFactory.CreateLogger<ClientLoggingInterceptor...