Agent-Status und Inaktivitaets-Erkennung implementiert

- Status wird aus last_heartbeat berechnet (online/stale/offline/unknown)
- GET /agents und GET /agents/{id} liefern status Feld
- agent_events Tabelle fuer Event-Tracking (Migration automatisch)
- Inaktivitaets-Monitor als Goroutine (prueft alle 60s, schreibt Events bei Statuswechsel)
- WebSocket Connect/Disconnect Events werden automatisch geschrieben
- API-Endpoints: GET /agents/events und GET /agents/{id}/events (?limit=N&type=X)
- DB-Methoden: InsertAgentEvent, GetAgentEvents, GetAllAgentEvents, GetAgentStatus
- README aktualisiert (Status-Doku, Events API, Dateistruktur)

README.md

@@ -161,6 +161,42 @@ daemon -f -p /var/run/rmm-agent.pid -o /usr/local/rmm/rmm-agent.log \
 | GET | `/api/v1/agents/{id}/system` | Nur Systemdaten |
 | DELETE | `/api/v1/agents/{id}` | Agent loeschen |
 
+### Agent-Status
+
+Status wird automatisch aus `last_heartbeat` berechnet (kein DB-Feld):
+
+| Status | Bedingung |
+|--------|-----------|
+| `online` | Heartbeat < 2 Minuten |
+| `stale` | Heartbeat < 5 Minuten |
+| `offline` | Heartbeat > 5 Minuten |
+| `unknown` | Kein Heartbeat vorhanden |
+
+`GET /agents` liefert ein `status` Feld pro Agent, `GET /agents/{id}` ebenfalls.
+
+### Agent-Events
+
+| Methode | Endpoint | Beschreibung |
+|---------|----------|-------------|
+| GET | `/api/v1/agents/events` | Alle Events (`?limit=N&type=X`) |
+| GET | `/api/v1/agents/{id}/events` | Events eines Agents (`?limit=N&type=X`) |
+
+Event-Typen: `online`, `offline`, `stale`, `connected`, `disconnected`
+
+Events werden automatisch geschrieben bei:
+- WebSocket Connect/Disconnect (`connected`/`disconnected`)
+- Inaktivitaets-Monitor erkennt Statuswechsel (`online`/`stale`/`offline`)
+
+```bash
+# Alle Events (letzte 10)
+curl -sk -H "X-API-Key: 01532e5a7c9e70bf2757df77a2f5b9b9" \
+  "https://192.168.85.13:8443/api/v1/agents/events?limit=10"
+
+# Nur Offline-Events eines Agents
+curl -sk -H "X-API-Key: 01532e5a7c9e70bf2757df77a2f5b9b9" \
+  "https://192.168.85.13:8443/api/v1/agents/6beb8dfd38ecf03eab6c0f21b4ac7bee/events?type=offline"
+```
+
 ### WebSocket
 
 | Methode | Endpoint | Beschreibung |
@@ -518,8 +554,10 @@ rmm/
 │   ├── models/
 │   │   ├── agent.go             # Agent, Register/Heartbeat Structs
 │   │   └── system.go            # SystemData, alle Collector-Structs
+│   ├── monitor/
+│   │   └── monitor.go           # Inaktivitaets-Monitor (prueft Heartbeat, schreibt Events)
 │   ├── api/
-│   │   ├── handlers.go          # REST API Handler
+│   │   ├── handlers.go          # REST API Handler (inkl. Agent-Status + Events)
 │   │   ├── tunnel_proxy.go      # Tunnel + Exec + Update REST Endpoints
 │   │   ├── backup.go            # Config-Backup Endpoints (trigger, list, download, diff)
 │   │   ├── wireguard.go        # WireGuard Peer API Endpoints

backend/api/handlers.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"log"
 	"net/http"
+	"strconv"
 	"strings"
 	"time"
 
@@ -28,7 +29,9 @@ func (h *Handler) SetupRoutes(mux *http.ServeMux, hub *ws.Hub) {
 	mux.HandleFunc("POST /api/v1/agent/register", h.registerAgent)
 	mux.HandleFunc("POST /api/v1/agent/heartbeat", h.heartbeat)
 	mux.HandleFunc("GET /api/v1/agents", h.listAgents)
+	mux.HandleFunc("GET /api/v1/agents/events", h.getAllAgentEvents)
 	mux.HandleFunc("GET /api/v1/agents/{id}", h.getAgent)
+	mux.HandleFunc("GET /api/v1/agents/{id}/events", h.getAgentEvents)
 	mux.HandleFunc("GET /api/v1/agents/{id}/system", h.getSystemData)
 	mux.HandleFunc("DELETE /api/v1/agents/{id}", h.deleteAgent)
 	
@@ -151,7 +154,19 @@ func (h *Handler) listAgents(w http.ResponseWriter, r *http.Request) {
 	if agents == nil {
 		agents = []models.Agent{}
 	}
-	writeJSON(w, http.StatusOK, agents)
+
+	// Status fuer jeden Agent berechnen
+	var response []models.AgentResponse
+	for _, a := range agents {
+		response = append(response, models.AgentResponse{
+			Agent:  a,
+			Status: models.CalculateAgentStatus(a.LastHeartbeat),
+		})
+	}
+	if response == nil {
+		response = []models.AgentResponse{}
+	}
+	writeJSON(w, http.StatusOK, response)
 }
 
 // GET /api/v1/agents/{id}
@@ -170,6 +185,7 @@ func (h *Handler) getAgent(w http.ResponseWriter, r *http.Request) {
 
 	result := map[string]interface{}{
 		"agent":       agent,
+		"status":      models.CalculateAgentStatus(agent.LastHeartbeat),
 		"system_data": sysData,
 	}
 	writeJSON(w, http.StatusOK, result)
@@ -207,3 +223,42 @@ func (h *Handler) deleteAgent(w http.ResponseWriter, r *http.Request) {
 	log.Printf("Agent geloescht: %s", id)
 	writeJSON(w, http.StatusOK, map[string]string{"message": "Agent geloescht"})
 }
+
+// GET /api/v1/agents/{id}/events
+func (h *Handler) getAgentEvents(w http.ResponseWriter, r *http.Request) {
+	agentID := r.PathValue("id")
+	eventType := r.URL.Query().Get("type")
+	limit := 100
+	if l := r.URL.Query().Get("limit"); l != "" {
+		if n, err := strconv.Atoi(l); err == nil && n > 0 {
+			limit = n
+		}
+	}
+
+	events, err := h.db.GetAgentEvents(agentID, eventType, limit)
+	if err != nil {
+		log.Printf("Fehler beim Laden der Events: %v", err)
+		writeError(w, http.StatusInternalServerError, "Fehler beim Laden")
+		return
+	}
+	writeJSON(w, http.StatusOK, events)
+}
+
+// GET /api/v1/agents/events
+func (h *Handler) getAllAgentEvents(w http.ResponseWriter, r *http.Request) {
+	eventType := r.URL.Query().Get("type")
+	limit := 100
+	if l := r.URL.Query().Get("limit"); l != "" {
+		if n, err := strconv.Atoi(l); err == nil && n > 0 {
+			limit = n
+		}
+	}
+
+	events, err := h.db.GetAllAgentEvents(eventType, limit)
+	if err != nil {
+		log.Printf("Fehler beim Laden der Events: %v", err)
+		writeError(w, http.StatusInternalServerError, "Fehler beim Laden")
+		return
+	}
+	writeJSON(w, http.StatusOK, events)
+}

backend/db/postgres.go

@@ -88,6 +88,15 @@ func (d *Database) migrate() error {
 
 	CREATE INDEX IF NOT EXISTS idx_config_backups_agent ON config_backups(agent_id, created_at DESC);
 	CREATE INDEX IF NOT EXISTS idx_config_backups_hash ON config_backups(agent_id, hash);
+
+	CREATE TABLE IF NOT EXISTS agent_events (
+		id SERIAL PRIMARY KEY,
+		agent_id TEXT NOT NULL REFERENCES agents(id) ON DELETE CASCADE,
+		event_type TEXT NOT NULL,
+		message TEXT,
+		created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+	);
+	CREATE INDEX IF NOT EXISTS idx_agent_events_agent ON agent_events(agent_id, created_at DESC);
 	`
 
 	if _, err := d.db.Exec(schema); err != nil {
@@ -631,3 +640,101 @@ func (d *Database) GetMetricsSummary(agentID, metric, bucket string, from, to ti
 	}
 	return results, rows.Err()
 }
+
+// --- Agent Events Methoden ---
+
+// InsertAgentEvent schreibt ein Event in die agent_events Tabelle
+func (d *Database) InsertAgentEvent(agentID, eventType, message string) error {
+	_, err := d.db.Exec(
+		"INSERT INTO agent_events (agent_id, event_type, message) VALUES ($1, $2, $3)",
+		agentID, eventType, message,
+	)
+	if err != nil {
+		log.Printf("Event schreiben fehlgeschlagen: %v", err)
+	}
+	return err
+}
+
+// GetAgentEvents holt Events fuer einen bestimmten Agent
+func (d *Database) GetAgentEvents(agentID string, eventType string, limit int) ([]models.AgentEvent, error) {
+	if limit <= 0 {
+		limit = 100
+	}
+
+	query := "SELECT id, agent_id, event_type, COALESCE(message, ''), created_at FROM agent_events WHERE agent_id = $1"
+	args := []interface{}{agentID}
+
+	if eventType != "" {
+		query += " AND event_type = $2"
+		args = append(args, eventType)
+	}
+
+	query += fmt.Sprintf(" ORDER BY created_at DESC LIMIT $%d", len(args)+1)
+	args = append(args, limit)
+
+	rows, err := d.db.Query(query, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var events []models.AgentEvent
+	for rows.Next() {
+		var e models.AgentEvent
+		if err := rows.Scan(&e.ID, &e.AgentID, &e.EventType, &e.Message, &e.CreatedAt); err != nil {
+			return nil, err
+		}
+		events = append(events, e)
+	}
+	if events == nil {
+		events = []models.AgentEvent{}
+	}
+	return events, rows.Err()
+}
+
+// GetAllAgentEvents holt Events fuer alle Agents
+func (d *Database) GetAllAgentEvents(eventType string, limit int) ([]models.AgentEvent, error) {
+	if limit <= 0 {
+		limit = 100
+	}
+
+	query := "SELECT id, agent_id, event_type, COALESCE(message, ''), created_at FROM agent_events"
+	args := []interface{}{}
+
+	if eventType != "" {
+		query += " WHERE event_type = $1"
+		args = append(args, eventType)
+	}
+
+	query += fmt.Sprintf(" ORDER BY created_at DESC LIMIT $%d", len(args)+1)
+	args = append(args, limit)
+
+	rows, err := d.db.Query(query, args...)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var events []models.AgentEvent
+	for rows.Next() {
+		var e models.AgentEvent
+		if err := rows.Scan(&e.ID, &e.AgentID, &e.EventType, &e.Message, &e.CreatedAt); err != nil {
+			return nil, err
+		}
+		events = append(events, e)
+	}
+	if events == nil {
+		events = []models.AgentEvent{}
+	}
+	return events, rows.Err()
+}
+
+// GetAgentStatus berechnet den Status eines Agents aus last_heartbeat
+func (d *Database) GetAgentStatus(agentID string) string {
+	var lastHB sql.NullTime
+	err := d.db.QueryRow("SELECT last_heartbeat FROM agents WHERE id = $1", agentID).Scan(&lastHB)
+	if err != nil || !lastHB.Valid {
+		return "unknown"
+	}
+	return models.CalculateAgentStatus(&lastHB.Time)
+}

backend/main.go

@@ -19,6 +19,7 @@ import (
 	"github.com/cynfo/rmm-backend/api"
 	"github.com/cynfo/rmm-backend/config"
 	"github.com/cynfo/rmm-backend/db"
+	"github.com/cynfo/rmm-backend/monitor"
 	"github.com/cynfo/rmm-backend/ws"
 )
 
@@ -47,8 +48,15 @@ func main() {
 
 	// WebSocket Hub starten
 	hub := ws.NewHub()
+	hub.SetEventCallback(func(agentID, eventType, message string) {
+		database.InsertAgentEvent(agentID, eventType, message)
+	})
 	go hub.Run()
 
+	// Inaktivitaets-Monitor starten
+	mon := monitor.New(database)
+	go mon.Run()
+
 	// Router aufbauen
 	mux := http.NewServeMux()
 	handler := api.NewHandler(database)

backend/models/agent.go

@@ -13,6 +13,37 @@ type Agent struct {
 	LastHeartbeat   *time.Time `json:"last_heartbeat,omitempty"`
 }
 
+// AgentResponse erweitert Agent um den berechneten Status
+type AgentResponse struct {
+	Agent
+	Status string `json:"status"`
+}
+
+// AgentEvent repraesentiert ein Event in der agent_events Tabelle
+type AgentEvent struct {
+	ID        int       `json:"id"`
+	AgentID   string    `json:"agent_id"`
+	EventType string    `json:"event_type"`
+	Message   string    `json:"message,omitempty"`
+	CreatedAt time.Time `json:"created_at"`
+}
+
+// CalculateAgentStatus berechnet den Status aus dem letzten Heartbeat
+func CalculateAgentStatus(lastHeartbeat *time.Time) string {
+	if lastHeartbeat == nil {
+		return "unknown"
+	}
+	age := time.Since(*lastHeartbeat)
+	switch {
+	case age < 2*time.Minute:
+		return "online"
+	case age < 5*time.Minute:
+		return "stale"
+	default:
+		return "offline"
+	}
+}
+
 // RegisterRequest - Agent-Registrierung
 type RegisterRequest struct {
 	AgentID         string `json:"agent_id,omitempty"`

backend/monitor/monitor.go

@@ -0,0 +1,77 @@
+package monitor
+
+import (
+	"log"
+	"sync"
+	"time"
+
+	"github.com/cynfo/rmm-backend/db"
+	"github.com/cynfo/rmm-backend/models"
+)
+
+// Monitor prueft periodisch den Agent-Status und schreibt Events bei Statuswechsel
+type Monitor struct {
+	db           *db.Database
+	lastStatus   map[string]string
+	lastStatusMu sync.Mutex
+	interval     time.Duration
+}
+
+// New erstellt einen neuen Monitor
+func New(database *db.Database) *Monitor {
+	return &Monitor{
+		db:         database,
+		lastStatus: make(map[string]string),
+		interval:   60 * time.Second,
+	}
+}
+
+// Run startet den Monitor als Goroutine — blockiert, also mit go aufrufen
+func (m *Monitor) Run() {
+	log.Println("Inaktivitaets-Monitor gestartet (Intervall: 60s)")
+
+	// Initialen Status laden
+	m.checkAgents()
+
+	ticker := time.NewTicker(m.interval)
+	defer ticker.Stop()
+
+	for range ticker.C {
+		m.checkAgents()
+	}
+}
+
+func (m *Monitor) checkAgents() {
+	agents, err := m.db.GetAgents()
+	if err != nil {
+		log.Printf("Monitor: Fehler beim Laden der Agents: %v", err)
+		return
+	}
+
+	m.lastStatusMu.Lock()
+	defer m.lastStatusMu.Unlock()
+
+	for _, agent := range agents {
+		newStatus := models.CalculateAgentStatus(agent.LastHeartbeat)
+		oldStatus, known := m.lastStatus[agent.ID]
+
+		if !known {
+			// Erster Check — Status merken, kein Event
+			m.lastStatus[agent.ID] = newStatus
+			log.Printf("Monitor: Agent %s (%s) initialer Status: %s", agent.Name, agent.ID, newStatus)
+			continue
+		}
+
+		if oldStatus == newStatus {
+			continue
+		}
+
+		// Statuswechsel erkannt
+		log.Printf("Monitor: Agent %s (%s) Status-Wechsel: %s -> %s", agent.Name, agent.ID, oldStatus, newStatus)
+		m.lastStatus[agent.ID] = newStatus
+
+		// Event schreiben
+		message := "Status-Wechsel: " + oldStatus + " -> " + newStatus
+		m.db.InsertAgentEvent(agent.ID, newStatus, message)
+	}
+}

backend/ws/hub.go

@@ -26,6 +26,9 @@ type Hub struct {
 	// Response-Waiters: Command-ID -> Response-Channel
 	responseWaiters map[string]chan map[string]interface{}
 	waitersMux      sync.RWMutex
+
+	// Event-Callback fuer DB-Events bei Connect/Disconnect
+	eventCallback func(agentID, eventType, message string)
 }
 
 func NewHub() *Hub {
@@ -41,6 +44,11 @@ func NewHub() *Hub {
 	return hub
 }
 
+// SetEventCallback setzt die Callback-Funktion fuer Connect/Disconnect Events
+func (h *Hub) SetEventCallback(cb func(agentID, eventType, message string)) {
+	h.eventCallback = cb
+}
+
 func (h *Hub) Run() {
 	log.Println("WebSocket Hub startet...")
 	
@@ -79,6 +87,11 @@ func (h *Hub) registerAgent(agent *AgentConnection) {
 	agent.LastSeen = time.Now()
 	
 	log.Printf("Agent %s: WebSocket-Verbindung registriert", agent.AgentID)
+
+	// Event schreiben
+	if h.eventCallback != nil {
+		go h.eventCallback(agent.AgentID, "connected", "WebSocket-Verbindung hergestellt")
+	}
 }
 
 func (h *Hub) unregisterAgent(agent *AgentConnection) {
@@ -89,7 +102,12 @@ func (h *Hub) unregisterAgent(agent *AgentConnection) {
 		delete(h.agents, agent.AgentID)
 		existing.Connection.Close()
 		log.Printf("Agent %s: WebSocket-Verbindung entfernt", agent.AgentID)
-		
+
+		// Event schreiben
+		if h.eventCallback != nil {
+			go h.eventCallback(agent.AgentID, "disconnected", "WebSocket-Verbindung getrennt")
+		}
+
 		// Alle Tunnel für diesen Agent schließen
 		h.tunnelManager.CloseAgentTunnels(agent.AgentID)
 	}