fix gocritic linter warnings

client/proxy/proxy_manager.go

@@ -113,11 +113,9 @@ func (pm *Manager) Reload(pxyCfgs map[string]config.ProxyConf) {
 		cfg, ok := pxyCfgs[name]
 		if !ok {
 			del = true
-		} else {
-			if !pxy.Cfg.Compare(cfg) {
+		} else if !pxy.Cfg.Compare(cfg) {
 			del = true
 		}
-		}
 
 		if del {
 			delPxyNames = append(delPxyNames, name)

client/service.go

@@ -181,7 +181,7 @@ func (svr *Service) keepControllerWorking() {
 				xl.Warn("reconnect to server error: %v, wait %v for another retry", err, delayTime)
 				util.RandomSleep(delayTime, 0.9, 1.1)
 
-				delayTime = delayTime * 2
+				delayTime *= 2
 				if delayTime > maxDelayTime {
 					delayTime = maxDelayTime
 				}

client/visitor_manager.go

@@ -99,11 +99,9 @@ func (vm *VisitorManager) Reload(cfgs map[string]config.VisitorConf) {
 		cfg, ok := cfgs[name]
 		if !ok {
 			del = true
-		} else {
-			if !oldCfg.Compare(cfg) {
+		} else if !oldCfg.Compare(cfg) {
 			del = true
 		}
-		}
 
 		if del {
 			delNames = append(delNames, name)

pkg/util/net/tls.go

@@ -41,13 +41,16 @@ func CheckAndEnableTLSServerConnWithTimeout(
 		return
 	}
 
-	if n == 1 && int(buf[0]) == FRPTLSHeadByte {
+	if n == 1 {
+		switch int(buf[0]) {
+		case FRPTLSHeadByte:
 			out = tls.Server(c, tlsConfig)
 			isTLS = true
 			custom = true
-	} else if n == 1 && int(buf[0]) == 0x16 {
+		case 0x16:
 			out = tls.Server(sc, tlsConfig)
 			isTLS = true
+		}
 	} else {
 		if tlsOnly {
 			err = fmt.Errorf("non-TLS connection received on a TlsOnly server")

pkg/util/util/util.go

@@ -44,7 +44,7 @@ func RandIDWithLen(idLen int) (id string, err error) {
 }
 
 func GetAuthKey(token string, timestamp int64) (key string) {
-	token = token + fmt.Sprintf("%d", timestamp)
+	token += fmt.Sprintf("%d", timestamp)
 	md5Ctx := md5.New()
 	md5Ctx.Write([]byte(token))
 	data := md5Ctx.Sum(nil)
@@ -70,7 +70,8 @@ func ParseRangeNumbers(rangeStr string) (numbers []int64, err error) {
 		numArray := strings.Split(numRangeStr, "-")
 		// length: only 1 or 2 is correct
 		rangeType := len(numArray)
-		if rangeType == 1 {
+		switch rangeType {
+		case 1:
 			// single number
 			singleNum, errRet := strconv.ParseInt(strings.TrimSpace(numArray[0]), 10, 64)
 			if errRet != nil {
@@ -78,7 +79,7 @@ func ParseRangeNumbers(rangeStr string) (numbers []int64, err error) {
 				return
 			}
 			numbers = append(numbers, singleNum)
-		} else if rangeType == 2 {
+		case 2:
 			// range numbers
 			min, errRet := strconv.ParseInt(strings.TrimSpace(numArray[0]), 10, 64)
 			if errRet != nil {
@@ -97,7 +98,7 @@ func ParseRangeNumbers(rangeStr string) (numbers []int64, err error) {
 			for i := min; i <= max; i++ {
 				numbers = append(numbers, i)
 			}
-		} else {
+		default:
 			err = fmt.Errorf("range number is invalid")
 			return
 		}

server/control.go

@@ -528,13 +528,13 @@ func (ctl *Control) RegisterProxy(pxyMsg *msg.NewProxy) (remoteAddr string, err
 			err = fmt.Errorf("exceed the max_ports_per_client")
 			return
 		}
-		ctl.portsUsedNum = ctl.portsUsedNum + pxy.GetUsedPortsNum()
+		ctl.portsUsedNum += pxy.GetUsedPortsNum()
 		ctl.mu.Unlock()
 
 		defer func() {
 			if err != nil {
 				ctl.mu.Lock()
-				ctl.portsUsedNum = ctl.portsUsedNum - pxy.GetUsedPortsNum()
+				ctl.portsUsedNum -= pxy.GetUsedPortsNum()
 				ctl.mu.Unlock()
 			}
 		}()
@@ -570,7 +570,7 @@ func (ctl *Control) CloseProxy(closeMsg *msg.CloseProxy) (err error) {
 	}
 
 	if ctl.serverCfg.MaxPortsPerClient > 0 {
-		ctl.portsUsedNum = ctl.portsUsedNum - pxy.GetUsedPortsNum()
+		ctl.portsUsedNum -= pxy.GetUsedPortsNum()
 	}
 	pxy.Close()
 	ctl.pxyManager.Del(pxy.GetName())