feat(watchdog): add watchdog service with TCP client implementation

- Implement TCP client for watchdog service communication
- Add watchdog configuration in config.json
- Update main.go to initialize and connect to watchdog
- Add watchdog related functions (connect, command handling)
- Update README.md with new watchdog feature
- Improve route setup logging in router.go

README.md

@@ -72,6 +72,8 @@ For detailed API documentation, please see [docs/api.md](docs/api.md)
 - [x] Fix backend can still start frpc instance when it is already running
 - [ ] Develop an agent software to handle windows service management
 - [ ] Refactor all log output level to be more clear
+- [ ] Add global websocket endpoint for posting notifications
+- [ ] Add frpc instance watchdog
 
 ## License
 

config.go

@@ -17,6 +17,9 @@ type Config struct {
 	FrpcPath     string `json:"frpcPath"`
 	InstancePath string `json:"instancePath"`
 	Debug        bool   `json:"debug"`
+	Watchdog     struct {
+		Port int `json:"port"`
+	} `json:"watchdog"`
 }
 
 type InstanceInfo struct {
@@ -75,13 +78,21 @@ func LoadConfig(configPath string) (*Config, error) {
 	}
 
 	if config.FrpcPath == "" {
+		if GetInitSystem() == "windows" {
+			config.FrpcPath = "frp_client/frpc.exe"
+		} else {
 			config.FrpcPath = "/usr/bin/frpc"
 		}
+	}
 
 	if config.InstancePath == "" {
 		config.InstancePath = "./configs"
 	}
 
+	if config.Watchdog.Port == 0 {
+		config.Watchdog.Port = 12380
+	}
+
 	if err := os.MkdirAll(config.InstancePath, 0755); err != nil {
 		return nil, fmt.Errorf("failed to create config directory: %w", err)
 	}

main.go

@@ -8,6 +8,7 @@ import (
 	"os/signal"
 	"super-frpc/frpLogger"
 	"super-frpc/postLog"
+	"super-frpc/watchdog"
 	"syscall"
 	"time"
 )
@@ -90,6 +91,17 @@ func main() {
 
 	setupRoutes()
 
+	err = watchdog.Init()
+	if err != nil {
+		postLog.Error(fmt.Sprintf("Unable to initialize Watchdog: %s", err))
+	} else {
+		if !watchdog.Connect("127.0.0.1", config.Watchdog.Port) {
+			postLog.Error(fmt.Sprintf("Failed to connect to Watchdog at %s:%d", "127.0.0.1", config.Watchdog.Port))
+		}
+	}
+
+
+
 	addr := fmt.Sprintf("%s:%s", config.ListenAddr, config.ListenPort)
 	server := &http.Server{
 		Addr:         addr,

router.go

@@ -8,7 +8,6 @@ import (
 )
 
 func setupRoutes() {
-	postLog.Info("Setting up routes...")
 	http.HandleFunc("/system/getStatus", GetStatusHandler)
 	http.HandleFunc("/system/getSoftwareInfo", GetSoftwareInfoHandler)
 	systemLogHandler := postLog.NewLogSocketHandler(postLog.GetLogBroadcaster())
@@ -44,6 +43,8 @@ func setupRoutes() {
 
 	http.HandleFunc("/", NotFoundHandler)
 
+	postLog.Info("Routes setup successfully")
+
 }
 
 func NotFoundHandler(w http.ResponseWriter, r *http.Request) {

watchdog/command.go

@@ -0,0 +1,33 @@
+package watchdog
+
+import (
+	"fmt"
+)
+
+func AddInstance(serviceName string) bool {
+	if !IsConnected() {
+		return false
+	}
+
+	message := fmt.Sprintf("[addInstance] <serviceName>%s</serviceName>", serviceName)
+	response, err := sendMsg(message, 3)
+	if err != nil {
+		return false
+	}
+
+	return response == "success"
+}
+
+func RemoveInstance(serviceName string) bool {
+	if !IsConnected() {
+		return false
+	}
+
+	message := fmt.Sprintf("[removeInstance] <serviceName>%s</serviceName>", serviceName)
+	response, err := sendMsg(message, 3)
+	if err != nil {
+		return false
+	}
+
+	return response == "success"
+}

watchdog/connect.go

@@ -0,0 +1,47 @@
+package watchdog
+
+import (
+	"time"
+)
+
+func Connect(ipaddr string, port int) bool {
+	if IsConnected() {
+		return true
+	}
+
+	if err := Init(); err != nil {
+		return false
+	}
+
+	if err := tcpConnect(ipaddr, port); err != nil {
+		return false
+	}
+
+	response, err := sendMsg("watchdogAgentConnectionTest", 3)
+	if err != nil {
+		Destroy()
+		return false
+	}
+
+	if response != "success" {
+		Destroy()
+		return false
+	}
+
+	return true
+}
+
+func Disconnect() bool {
+	if !IsConnected() {
+		return true
+	}
+
+	err := Destroy()
+	if err != nil {
+		return false
+	}
+
+	time.Sleep(100 * time.Millisecond)
+
+	return true
+}

watchdog/tcpClient.go

@@ -0,0 +1,164 @@
+package watchdog
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"super-frpc/postLog"
+	"sync"
+	"time"
+)
+
+var (
+	tcpConn      net.Conn
+	tcpConnMutex sync.Mutex
+	isConnected  bool
+	recvChan     chan string
+	stopRecvChan chan struct{}
+)
+
+func notifyMessage(message string) {
+	postLog.Info(fmt.Sprintf("%s", message))
+}
+
+func Init() error {
+	tcpConnMutex.Lock()
+	defer tcpConnMutex.Unlock()
+
+	if tcpConn != nil {
+		return fmt.Errorf("TCP client already initialized")
+	}
+
+	recvChan = make(chan string, 100)
+	stopRecvChan = make(chan struct{})
+	isConnected = false
+
+	return nil
+}
+
+func tcpConnect(ipaddr string, port int) error {
+	tcpConnMutex.Lock()
+	defer tcpConnMutex.Unlock()
+
+	if tcpConn != nil {
+		return fmt.Errorf("already connected")
+	}
+
+	address := fmt.Sprintf("%s:%d", ipaddr, port)
+	conn, err := net.DialTimeout("tcp", address, 3*time.Second)
+	if err != nil {
+		return fmt.Errorf("failed to connect to %s: %v", address, err)
+	}
+
+	tcpConn = conn
+	isConnected = true
+
+	go recvMsg()
+
+	return nil
+}
+
+func sendMsg(message string, target int) (string, error) {
+	tcpConnMutex.Lock()
+
+	if tcpConn == nil {
+		tcpConnMutex.Unlock()
+		return "", fmt.Errorf("not connected")
+	}
+
+	_, err := tcpConn.Write([]byte(message + "\n"))
+	if err != nil {
+		tcpConnMutex.Unlock()
+		return "", fmt.Errorf("failed to send message: %v", err)
+	}
+
+	tcpConnMutex.Unlock()
+
+	select {
+	case response := <-recvChan:
+		return response, nil
+	case <-time.After(time.Duration(target) * time.Second):
+		return "", fmt.Errorf("timeout waiting for response")
+	}
+}
+
+func recvMsg() {
+	reader := bufio.NewReader(tcpConn)
+	for {
+		select {
+		case <-stopRecvChan:
+			return
+		default:
+			tcpConn.SetReadDeadline(time.Now().Add(100 * time.Millisecond))
+			line, err := reader.ReadString('\n')
+			if err != nil {
+				if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
+					continue
+				}
+				tcpConnMutex.Lock()
+				if tcpConn != nil {
+					tcpConn.Close()
+					tcpConn = nil
+					isConnected = false
+				}
+				tcpConnMutex.Unlock()
+				return
+			}
+
+			line = line[:len(line)-1]
+			if len(line) > 0 {
+				select {
+				case recvChan <- line:
+				default:
+					select {
+					case <-recvChan:
+						recvChan <- line
+					default:
+					}
+				}
+
+				if len(line) > 0 && line != "success" && !isResponseMessage(line) {
+					notifyMessage(line)
+				}
+			}
+		}
+	}
+}
+
+func isResponseMessage(msg string) bool {
+	return msg == "success" || msg == "failed"
+}
+
+
+
+func Destroy() error {
+	tcpConnMutex.Lock()
+	defer tcpConnMutex.Unlock()
+
+	if stopRecvChan != nil {
+		close(stopRecvChan)
+		stopRecvChan = nil
+	}
+
+	if tcpConn != nil {
+		err := tcpConn.Close()
+		tcpConn = nil
+		isConnected = false
+		if err != nil {
+			return fmt.Errorf("failed to close connection: %v", err)
+		}
+	}
+
+	if recvChan != nil {
+		close(recvChan)
+		recvChan = nil
+	}
+
+	return nil
+}
+
+func IsConnected() bool {
+	tcpConnMutex.Lock()
+	defer tcpConnMutex.Unlock()
+	return isConnected && tcpConn != nil
+}