Feature: Add remove api for offline proxy

add api to remove a single proxy with name and type
example:
  curl -X DELETE -u admin:admin -v http://127.0.0.1:7500/api/proxy/tcp/test-tcp
output:
  proxy "test-tcp" deleted

.gitignore

@@ -6,6 +6,7 @@
 # Folders
 _obj
 _test
+.DS_Store
 
 # Architecture specific extensions/prefixes
 *.[568vq]

pkg/metrics/mem/server.go

@@ -260,6 +260,17 @@ func (m *serverMetrics) GetProxiesByTypeAndName(proxyType string, proxyName stri
 	return
 }
 
+func (m *serverMetrics) RemoveProxyByTypeAndName(proxyType string, proxyName string) bool {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	sType, ok := m.info.ProxyStatistics[proxyName]
+	if ok && sType.ProxyType == proxyType {
+		delete(m.info.ProxyStatistics, proxyName)
+		return true
+	}
+	return false
+}
+
 func (m *serverMetrics) GetProxyTraffic(name string) (res *ProxyTrafficInfo) {
 	m.mu.Lock()
 	defer m.mu.Unlock()

pkg/metrics/mem/types.go

@@ -78,6 +78,7 @@ type Collector interface {
 	GetServer() *ServerStats
 	GetProxiesByType(proxyType string) []*ProxyStats
 	GetProxiesByTypeAndName(proxyType string, proxyName string) *ProxyStats
+	RemoveProxyByTypeAndName(proxyType string, proxyName string) bool
 	GetProxyTraffic(name string) *ProxyTrafficInfo
 	ClearOfflineProxies() (int, int)
 }

server/dashboard_api.go

@@ -17,6 +17,7 @@ package server
 import (
 	"cmp"
 	"encoding/json"
+	"fmt"
 	"net/http"
 	"slices"
 
@@ -52,6 +53,7 @@ func (svr *Service) registerRouteHandlers(helper *httppkg.RouterRegisterHelper)
 	subRouter.HandleFunc("/api/serverinfo", svr.apiServerInfo).Methods("GET")
 	subRouter.HandleFunc("/api/proxy/{type}", svr.apiProxyByType).Methods("GET")
 	subRouter.HandleFunc("/api/proxy/{type}/{name}", svr.apiProxyByTypeAndName).Methods("GET")
+	subRouter.HandleFunc("/api/proxy/{type}/{name}", svr.apiProxyDeleteByTypeAndName).Methods("DELETE")
 	subRouter.HandleFunc("/api/traffic/{name}", svr.apiProxyTraffic).Methods("GET")
 	subRouter.HandleFunc("/api/proxies", svr.deleteProxies).Methods("DELETE")
 
@@ -308,6 +310,42 @@ func (svr *Service) apiProxyByTypeAndName(w http.ResponseWriter, r *http.Request
 	res.Msg = string(buf)
 }
 
+// /api/proxy/:type/:name DELETE
+func (svr *Service) apiProxyDeleteByTypeAndName(w http.ResponseWriter, r *http.Request) {
+	res := GeneralResponse{Code: 200}
+	params := mux.Vars(r)
+	proxyType := params["type"]
+	name := params["name"]
+
+	defer func() {
+		log.Infof("Http response [%s]: code [%d]", r.URL.Path, res.Code)
+		w.WriteHeader(res.Code)
+		if len(res.Msg) > 0 {
+			_, _ = w.Write([]byte(res.Msg))
+		}
+	}()
+	log.Infof("Http request: [%s]", r.URL.Path)
+
+	var proxyStatsResp GetProxyStatsResp
+	proxyStatsResp, res.Code, res.Msg = svr.getProxyStatsByTypeAndName(proxyType, name)
+	if res.Code != 200 {
+		return
+	}
+	log.Debugf("proxy to be deleted: %v", proxyStatsResp)
+	if proxyStatsResp.Status != "offline" {
+		res.Code = 400
+		res.Msg = "proxy is online, can not be deleted"
+		return
+	}
+	ok := mem.StatsCollector.RemoveProxyByTypeAndName(proxyType, name)
+	if !ok {
+		res.Code = 400
+		res.Msg = "proxy cannot not be deleted,name mismatch with type "
+		return
+	}
+	res.Msg = fmt.Sprintf("proxy %q is deleted successfully", name)
+}
+
 func (svr *Service) getProxyStatsByTypeAndName(proxyType string, proxyName string) (proxyInfo GetProxyStatsResp, code int, msg string) {
 	proxyInfo.Name = proxyName
 	ps := mem.StatsCollector.GetProxiesByTypeAndName(proxyType, proxyName)