admin: register the /monitoring routes

Adds handlers for the overview and the five detail pages, each building
the monitoring data once and rendering through the shared layout.

weed/admin/handlers/admin_handlers.go

@@ -30,6 +30,7 @@ type AdminHandlers struct {
 	mqHandlers             *MessageQueueHandlers
 	serviceAccountHandlers *ServiceAccountHandlers
 	groupHandlers          *GroupHandlers
+	monitoringHandlers     *MonitoringHandlers
 }
 
 // NewAdminHandlers creates a new instance of AdminHandlers
@@ -43,6 +44,7 @@ func NewAdminHandlers(adminServer *dash.AdminServer, store sessions.Store) *Admi
 	mqHandlers := NewMessageQueueHandlers(adminServer)
 	serviceAccountHandlers := NewServiceAccountHandlers(adminServer)
 	groupHandlers := NewGroupHandlers(adminServer)
+	monitoringHandlers := NewMonitoringHandlers(adminServer)
 	return &AdminHandlers{
 		adminServer:            adminServer,
 		sessionStore:           store,
@@ -55,6 +57,7 @@ func NewAdminHandlers(adminServer *dash.AdminServer, store sessions.Store) *Admi
 		mqHandlers:             mqHandlers,
 		serviceAccountHandlers: serviceAccountHandlers,
 		groupHandlers:          groupHandlers,
+		monitoringHandlers:     monitoringHandlers,
 	}
 }
 
@@ -130,6 +133,14 @@ func (h *AdminHandlers) registerUIRoutes(r *mux.Router) {
 	r.HandleFunc("/cluster/volume-servers", h.clusterHandlers.ShowClusterVolumeServers).Methods(http.MethodGet)
 	r.HandleFunc("/cluster/mount-clients", h.clusterHandlers.ShowMountClients).Methods(http.MethodGet)
 
+	// Monitoring routes
+	r.HandleFunc("/monitoring", h.monitoringHandlers.ShowOverview).Methods(http.MethodGet)
+	r.HandleFunc("/monitoring/volume-servers", h.monitoringHandlers.ShowVolumeServers).Methods(http.MethodGet)
+	r.HandleFunc("/monitoring/filers", h.monitoringHandlers.ShowFilers).Methods(http.MethodGet)
+	r.HandleFunc("/monitoring/s3", h.monitoringHandlers.ShowS3).Methods(http.MethodGet)
+	r.HandleFunc("/monitoring/masters", h.monitoringHandlers.ShowMasters).Methods(http.MethodGet)
+	r.HandleFunc("/monitoring/workers", h.monitoringHandlers.ShowWorkers).Methods(http.MethodGet)
+
 	// Storage management routes
 	r.HandleFunc("/storage/volumes", h.clusterHandlers.ShowClusterVolumes).Methods(http.MethodGet)
 	r.HandleFunc("/storage/volumes/{id}/{server}", h.clusterHandlers.ShowVolumeDetails).Methods(http.MethodGet)

weed/admin/handlers/monitoring_handlers.go

@@ -0,0 +1,55 @@
+package handlers
+
+import (
+	"net/http"
+
+	"github.com/a-h/templ"
+	"github.com/seaweedfs/seaweedfs/weed/admin/dash"
+	"github.com/seaweedfs/seaweedfs/weed/admin/view/app"
+	"github.com/seaweedfs/seaweedfs/weed/admin/view/layout"
+)
+
+// MonitoringHandlers serves the metrics monitoring pages.
+type MonitoringHandlers struct {
+	adminServer *dash.AdminServer
+}
+
+func NewMonitoringHandlers(adminServer *dash.AdminServer) *MonitoringHandlers {
+	return &MonitoringHandlers{adminServer: adminServer}
+}
+
+func (h *MonitoringHandlers) ShowOverview(w http.ResponseWriter, r *http.Request) {
+	h.render(w, r, app.Monitoring)
+}
+
+func (h *MonitoringHandlers) ShowVolumeServers(w http.ResponseWriter, r *http.Request) {
+	h.render(w, r, app.MonitoringVolumeServers)
+}
+
+func (h *MonitoringHandlers) ShowFilers(w http.ResponseWriter, r *http.Request) {
+	h.render(w, r, app.MonitoringFilers)
+}
+
+func (h *MonitoringHandlers) ShowS3(w http.ResponseWriter, r *http.Request) {
+	h.render(w, r, app.MonitoringS3)
+}
+
+func (h *MonitoringHandlers) ShowMasters(w http.ResponseWriter, r *http.Request) {
+	h.render(w, r, app.MonitoringMasters)
+}
+
+func (h *MonitoringHandlers) ShowWorkers(w http.ResponseWriter, r *http.Request) {
+	h.render(w, r, app.MonitoringWorkers)
+}
+
+// render builds the monitoring data once and wraps the given page in the layout.
+func (h *MonitoringHandlers) render(w http.ResponseWriter, r *http.Request, page func(dash.MonitoringData) templ.Component) {
+	data := h.adminServer.GetMonitoringData()
+
+	username := usernameOrDefault(r)
+	w.Header().Set("Content-Type", "text/html")
+	viewCtx := layout.NewViewContext(r, username, dash.CSRFTokenFromContext(r.Context()))
+	if err := layout.Layout(viewCtx, page(*data)).Render(r.Context(), w); err != nil {
+		writeJSONError(w, http.StatusInternalServerError, "Failed to render template: "+err.Error())
+	}
+}