first commit

server/main.go

@@ -0,0 +1,90 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"time"
+
+	pb "gordenko.dev/dima/protolab/gen/service/v1"
+
+	"gordenko.dev/dima/protolab/bin"
+)
+
+const (
+	Port = 8080
+)
+
+func handleConnection(conn net.Conn) {
+	defer conn.Close()
+	log.Printf("client %s connected\n", conn.RemoteAddr().String())
+
+	for {
+		var (
+			reqWrapper  pb.RequestWrapper
+			respWrapper *pb.ResponseWrapper
+		)
+
+		err := bin.ReadMessage(conn, &reqWrapper)
+		if err != nil {
+			log.Fatalf("read request: %v\n", err)
+		}
+
+		switch p := reqWrapper.Payload.(type) {
+		case *pb.RequestWrapper_SendTelemetry:
+			data := p.SendTelemetry
+			log.Printf("telemetry received from %s: Temp %.2f°C, BatteryLevel %v%%\n",
+				data.GetDeviceId(), data.GetTemperature(), data.GetBatteryLevel())
+
+			respWrapper = &pb.ResponseWrapper{
+				Payload: &pb.ResponseWrapper_TelemetryResp{
+					TelemetryResp: &pb.TelemetryResponse{
+						ResultCode: pb.TelemetryResponse_RESULT_CODE_SUCCEEDED,
+					},
+				},
+			}
+
+		case *pb.RequestWrapper_Ping:
+			data := p.Ping
+			log.Printf("ping received, client time %s\n",
+				time.Unix(data.GetTimestamp(), 0).Format(time.RFC3339))
+
+			respWrapper = &pb.ResponseWrapper{
+				Payload: &pb.ResponseWrapper_PingResp{
+					PingResp: &pb.PingResponse{
+						ServerTimestamp: time.Now().Unix(),
+					},
+				},
+			}
+
+		default:
+			log.Printf("unknown request received: %T\n", p)
+		}
+
+		err = bin.WriteMessage(conn, respWrapper)
+		if err != nil {
+			log.Fatalf("send response: %v\n", err)
+		} else {
+			log.Println("response sent")
+		}
+	}
+}
+
+func main() {
+	listener, err := net.Listen("tcp", fmt.Sprintf(":%d", Port))
+	if err != nil {
+		log.Fatalf("net.Listen: %v\n", err)
+	}
+	defer listener.Close()
+
+	log.Printf("server started on port %d", Port)
+
+	for {
+		conn, err := listener.Accept()
+		if err != nil {
+			log.Printf("listener.Accept: %v", err)
+			continue
+		}
+		go handleConnection(conn)
+	}
+}