Add week 2 materials

materials/02-communication/grpc-practice/go-server/main.go

@@ -0,0 +1,44 @@
+//go:generate protoc --go_out=. --go_opt=paths=source_relative --go-grpc_out=. --go-grpc_opt=paths=source_relative proto/storage.proto
+package main
+
+import (
+	"fmt"
+	storagepb "hsegrpc/proto"
+	"hsegrpc/storage"
+	"log"
+	"net"
+	"os"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/reflection"
+)
+
+func main() {
+	// Reading server address from env.
+	addr := os.Getenv("SERVER_ADDR")
+	if addr == "" {
+		addr = "0.0.0.0:51000"
+
+		fmt.Println("Missing SERVER_ADDR, using default value: " + addr)
+	}
+
+	// Creating a TCP socket.
+	lis, err := net.Listen("tcp", addr)
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+
+	grpcServer := grpc.NewServer()
+	// If you want to connect to the server via grpcurl, you have to register the reflection service.
+	reflection.Register(grpcServer)
+
+	// Creating and registering implementation of the storage service.
+	storageService := storage.NewServer()
+	storagepb.RegisterStorageServer(grpcServer, storageService)
+
+	// Starting the server.
+	err = grpcServer.Serve(lis)
+	if err != nil {
+		log.Fatalf("server failed")
+	}
+}