Initial commit of cart service using .net core 2.0. Working prototype without cache implementation (yet)

src/cartservice/Program.cs

@@ -0,0 +1,59 @@
+using System;
+using CommandLine;
+using Grpc.Core;
+
+namespace cartservice
+{
+    class Program
+    {
+        [Verb("start", HelpText = "Starts the server listening on provided port")]
+        class ServerOptions
+        {
+
+            [Option('p', "port", HelpText = "The port on for running the server", Required = true)]
+            public int Port { get; set; }
+        }
+
+        static object StartServer(string host, int port)
+        {
+            var store = new CartStore();
+            Server server = new Server
+            {
+                Services = { Hipstershop.CartService.BindService(new CartServiceImpl(store)) },
+                Ports = { new ServerPort(host, port, ServerCredentials.Insecure) }
+            };
+
+            Console.WriteLine("Cart server is listening on port " + port);
+            Console.WriteLine("Press any key to stop the server...");
+            server.Start();
+
+            Console.ReadKey();
+
+            server.ShutdownAsync().Wait();
+
+            return null;
+        }
+        static void Main(string[] args)
+        {
+            if (args.Length == 0)
+            {
+                Console.WriteLine("Invalid number of arguments supplied");
+                Environment.Exit(-1);
+            }
+
+            switch (args[0])
+            {
+                case "start":
+                    Parser.Default.ParseArguments<ServerOptions>(args).MapResult(
+                        (ServerOptions options) => StartServer("localhost", options.Port),
+                        errs => 1);
+                    break;
+                default:
+                    Console.WriteLine("Invalid command");
+                    break;
+            }
+
+            Console.WriteLine("Hello World!");
+        }
+    }
+}