Fix URLTest group hang on unresponsive outbound

experimental/clashapi/proxies.go

@@ -184,6 +184,30 @@ func updateProxy(w http.ResponseWriter, r *http.Request) {
 	render.NoContent(w, r)
 }
 
+func groupContains(outboundManager adapter.OutboundManager, outboundGroup adapter.OutboundGroup, tag string, visited map[string]bool) bool {
+	for _, memberTag := range outboundGroup.All() {
+		if memberTag == tag {
+			return true
+		}
+		member, loaded := outboundManager.Outbound(memberTag)
+		if !loaded {
+			continue
+		}
+		if group.RealTag(member) == tag {
+			return true
+		}
+		memberGroup, isGroup := member.(adapter.OutboundGroup)
+		if !isGroup || visited[memberTag] {
+			continue
+		}
+		visited[memberTag] = true
+		if groupContains(outboundManager, memberGroup, tag, visited) {
+			return true
+		}
+	}
+	return false
+}
+
 func getProxyDelay(server *Server) func(w http.ResponseWriter, r *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
 		query := r.URL.Query()
@@ -213,6 +237,16 @@ func getProxyDelay(server *Server) func(w http.ResponseWriter, r *http.Request)
 					Delay: delay,
 				})
 			}
+			for _, detour := range server.outbound.Outbounds() {
+				urlTestGroup, isURLTestGroup := detour.(adapter.URLTestGroup)
+				if !isURLTestGroup {
+					continue
+				}
+				if !groupContains(server.outbound, urlTestGroup, realTag, map[string]bool{detour.Tag(): true}) {
+					continue
+				}
+				urlTestGroup.PerformUpdateCheck()
+			}
 		}()
 
 		if ctx.Err() != nil {