✨ Setup etcd helper and magic onion

DysonNetwork.Shared/Etcd/EtcdServiceExtensions.cs

@@ -0,0 +1,46 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Configuration;
+using Grpc.Net.Client;
+using MagicOnion.Client;
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace DysonNetwork.Shared.Etcd
+{
+    public static class EtcdServiceExtensions
+    {
+        public static IServiceCollection AddEtcdService(this IServiceCollection services, IConfiguration configuration)
+        {
+            var etcdConnectionString = configuration.GetConnectionString("Etcd");
+            services.AddSingleton<IEtcdService>(new EtcdService(etcdConnectionString!));
+            return services;
+        }
+
+        public static IServiceCollection AddMagicOnionService<TService>(this IServiceCollection services)
+            where TService : class, MagicOnion.IService<TService>
+        {
+            services.AddSingleton(serviceProvider =>
+            {
+                var etcdService = serviceProvider.GetRequiredService<IEtcdService>();
+                var serviceName = typeof(TService).Name.TrimStart('I'); // Convention: IMyService -> MyService
+
+                // Synchronously wait for service discovery (or handle asynchronously if preferred)
+                var endpoints = etcdService.DiscoverServicesAsync(serviceName).GetAwaiter().GetResult();
+
+                if (!endpoints.Any())
+                {
+                    throw new InvalidOperationException($"No endpoints found for MagicOnion service: {serviceName}");
+                }
+
+                // For simplicity, use the first discovered endpoint
+                var endpoint = endpoints.First();
+
+                var channel = GrpcChannel.ForAddress(endpoint);
+                return MagicOnionClient.Create<TService>(channel);
+            });
+
+            return services;
+        }
+    }
+}