Initial commit

.vscode/launch.json

@@ -0,0 +1,17 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Launch",
+      "type": "go",
+      "request": "launch",
+      "mode": "auto",
+      "program": "${fileDirname}",
+      "env": {},
+      "args": []
+    }
+  ]
+}

.vscode/settings.json

@@ -0,0 +1,20 @@
+{
+  "editor.tabSize": 2,
+  "editor.insertSpaces": true,
+  "editor.formatOnSave": true,
+  "editor.formatOnPaste": true,
+  "editor.autoClosingBrackets": "languageDefined",
+  "editor.trimAutoWhitespace": true,
+  "files.trimTrailingWhitespace": true,
+  "files.trimFinalNewlines": true,
+  "git.ignoreLimitWarning": true,
+
+  "prettier.singleQuote": true,
+
+  "files.exclude": {
+    "**/.classpath": true,
+    "**/.project": true,
+    "**/.settings": true,
+    "**/.factorypath": true
+  }
+}

cmd/server/main.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"log"
+	"net"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"git.loafle.net/outsourcing/kiast-drone-collector/pkg/drone"
+)
+
+func main() {
+	laddr, err := net.ResolveTCPAddr("tcp", ":48879")
+	if nil != err {
+		log.Fatalln(err)
+	}
+	listener, err := net.ListenTCP("tcp", laddr)
+	if nil != err {
+		log.Fatalln(err)
+	}
+	log.Println("listening on", listener.Addr())
+
+	// Make a new service and send it into the background.
+	service := drone.NewService()
+	go service.Serve(listener)
+
+	// Handle SIGINT and SIGTERM.
+	ch := make(chan os.Signal)
+	signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM)
+	log.Println(<-ch)
+
+	// Stop the service gracefully.
+	service.Stop()
+}

go.mod

@@ -0,0 +1,3 @@
+module git.loafle.net/outsourcing/kiast-drone-collector
+
+go 1.12

pkg/drone/protocol.go

@@ -0,0 +1,13 @@
+package drone
+
+type DroneGPS struct {
+	Date      string
+	Time      string
+	Latitude  string
+	Longitude string
+	Altitude  string
+	Speed     string
+	Direction string
+	Fixed     string
+	LTEStatus string
+}

pkg/drone/service.go

@@ -0,0 +1,95 @@
+package drone
+
+import (
+	"log"
+	"net"
+	"sync"
+	"time"
+)
+
+// An uninteresting service.
+type Service struct {
+	ch        chan bool
+	waitGroup *sync.WaitGroup
+}
+
+// Make a new Service.
+func NewService() *Service {
+	s := &Service{
+		ch:        make(chan bool),
+		waitGroup: &sync.WaitGroup{},
+	}
+	s.waitGroup.Add(1)
+	return s
+}
+
+// Accept connections and spawn a goroutine to serve each one.  Stop listening
+// if anything is received on the service's channel.
+func (s *Service) Serve(listener *net.TCPListener) {
+	defer s.waitGroup.Done()
+	for {
+		select {
+		case <-s.ch:
+			log.Println("stopping listening on", listener.Addr())
+			listener.Close()
+			return
+		default:
+		}
+		listener.SetDeadline(time.Now().Add(1e9))
+		conn, err := listener.AcceptTCP()
+		if nil != err {
+			if opErr, ok := err.(*net.OpError); ok && opErr.Timeout() {
+				continue
+			}
+			log.Println(err)
+		}
+		log.Println(conn.RemoteAddr(), "connected")
+		s.waitGroup.Add(1)
+		go s.serve(conn)
+	}
+}
+
+// Stop the service by closing the service's channel.  Block until the service
+// is really stopped.
+func (s *Service) Stop() {
+	close(s.ch)
+	s.waitGroup.Wait()
+}
+
+// Serve a connection by reading and writing what was read.  That's right, this
+// is an echo service.  Stop reading and writing if anything is received on the
+// service's channel but only after writing what was read.
+func (s *Service) serve(conn *net.TCPConn) {
+	defer conn.Close()
+	defer s.waitGroup.Done()
+	for {
+		select {
+		case <-s.ch:
+			log.Println("disconnecting", conn.RemoteAddr())
+			return
+		default:
+		}
+		conn.SetDeadline(time.Now().Add(1e9))
+		buf := make([]byte, 4096)
+		if _, err := conn.Read(buf); nil != err {
+			if opErr, ok := err.(*net.OpError); ok && opErr.Timeout() {
+				continue
+			}
+			log.Println(err)
+			return
+		}
+
+		// fixed
+		// $$GPS, 년월일, 시분초, 위도, 경도, 고도, 속도, 방향, A, LTE 통신 상태, EMM 오류 정보, ESM 오류 정보, 신호세기, 위성 갯수, 위성 ID-신호세기, 위성 ID-신호세기, 위성 ID-신호세기, 위성 ID-신호세기
+		// $$GPS,20190718,050519,37396586,126968913,798,0,0,A,2,255,255,-53,13,17-44,19-43,6-42,28-41
+
+		// unfixed
+		// $$GPS,,,,,,,, V, LTE 통신 상태, EMM 오류 정보, ESM 오류 정보, 신호세기, 위성 갯수, 위성 ID-신호세기, 위성 ID-신호세기, 위성 ID-신호세기, 위성 ID-신호세기
+		// $$GPS,,,,,,,,V,2,255,255,-53,4,17-44,19-42,6-40,28-40
+
+		// if _, err := conn.Write(buf); nil != err {
+		// 	log.Println(err)
+		// 	return
+		// }
+	}
+}