feat: persist device offline lifecycle

cmd/agent/main.go

@@ -10,6 +10,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"runtime"
 	"sync"
 	"time"
 
@@ -72,7 +73,7 @@ func run(hub, name, token string, insecure bool) error {
 
 	// 初始握手附带画像
 	initProf := sysinfo.Collect("APPLICATION")
-	if err := writeJSON(cluster.Message{Event: "hello", Device: name, Profile: &initProf, TS: time.Now().Unix()}); err != nil {
+	if err := writeJSON(cluster.Message{Event: "hello", Device: name, Arch: runtime.GOARCH, OS: runtime.GOOS, Profile: &initProf, TS: time.Now().Unix()}); err != nil {
 		return err
 	}
 
@@ -85,7 +86,7 @@ func run(hub, name, token string, insecure bool) error {
 			select {
 			case <-t.C:
 				prof := sysinfo.Collect("APPLICATION")
-				_ = writeJSON(cluster.Message{Event: "ping", Device: name, Profile: &prof, TS: time.Now().Unix()})
+				_ = writeJSON(cluster.Message{Event: "ping", Device: name, Arch: runtime.GOARCH, OS: runtime.GOOS, Profile: &prof, TS: time.Now().Unix()})
 			case <-stopPing:
 				return
 			}
@@ -107,7 +108,7 @@ func run(hub, name, token string, insecure bool) error {
 		}
 		if msg.Event == "ping" {
 			prof := sysinfo.Collect("APPLICATION")
-			if err := writeJSON(cluster.Message{Event: "pong", Device: name, Profile: &prof, TS: msg.TS}); err != nil {
+			if err := writeJSON(cluster.Message{Event: "pong", Device: name, Arch: runtime.GOARCH, OS: runtime.GOOS, Profile: &prof, TS: msg.TS}); err != nil {
 				return err
 			}
 			continue

cmd/hub/main.go

@@ -55,7 +55,7 @@ func main() {
 	s := &api.Server{
 		Auth:      authManager,
 		Exec:      executor.Local{MaxOutput: 1024 * 1024},
-		Cluster:   func() *cluster.Manager { m := cluster.NewManager(clusterSecret); m.SetStore(store); return m }(),
+		Cluster:   cluster.NewManager(clusterSecret, store),
 		Store:     store,
 		LocalName: local,
 	}

internal/api/api.go

@@ -179,7 +179,7 @@ func (s *Server) exec(w http.ResponseWriter, r *http.Request) {
 	var res executor.Result
 	if s.isRemote(req.Device) {
 		if s.Cluster == nil || !s.Cluster.Online(req.Device) {
-			http.Error(w, "device offline", 404)
+			http.Error(w, "device offline", 409)
 			return
 		}
 		rr, err := s.Cluster.Exec(ctx, req.Device, cluster.ExecPayload{Command: req.Command, Workdir: req.Workdir, Timeout: req.Timeout})

internal/cluster/manager.go

@@ -16,6 +16,8 @@ import (
 	"github.com/wjyhk/vps-commander/internal/sysinfo"
 )
 
+const deviceOfflineAfter = 70 * time.Second
+
 type Manager struct {
 	Secret string
 	Store  *storage.Store
@@ -26,10 +28,16 @@ type Manager struct {
 type Node struct {
 	Name          string
 	Conn          *websocket.Conn
+	ConnectionID  string
 	WriteMu       sync.Mutex
 	Pending       sync.Map
 	LastSeen      atomic.Int64
+	LastHeartbeat atomic.Int64
+	Connected     atomic.Bool
 	LastProfile   *sysinfo.Profile
+	Arch          string
+	OS            string
+	IsLocal       bool
 }
 
 type Result struct {
@@ -47,8 +55,30 @@ type FileResult struct {
 	EOF       bool   `json:"eof"`
 }
 
-func NewManager(secret string) *Manager {
+func NewManager(secret string, store *storage.Store) *Manager {
-	return &Manager{Secret: secret, nodes: make(map[string]*Node)}
+	m := &Manager{Secret: secret, Store: store, nodes: make(map[string]*Node)}
+	if store != nil {
+		if records, err := store.ListDevices(); err == nil {
+			for _, d := range records {
+				if d.IsLocal {
+					continue
+				}
+				n := &Node{Name: d.Name, Arch: d.Arch, OS: d.OS}
+				n.LastSeen.Store(d.LastSeen * int64(time.Second))
+				n.LastHeartbeat.Store(d.LastHeartbeat * int64(time.Second))
+				if d.ProfileJSON != "" {
+					var p sysinfo.Profile
+					if json.Unmarshal([]byte(d.ProfileJSON), &p) == nil {
+						n.LastProfile = &p
+					}
+				}
+				n.Connected.Store(false)
+				m.nodes[d.Name] = n
+				_ = store.UpdateDeviceStatus(d.Name, "offline", d.LastHeartbeat)
+			}
+		}
+	}
+	return m
 }
 
 func (m *Manager) SetStore(s *storage.Store) {
@@ -83,14 +113,17 @@ func (m *Manager) ServeWS(w http.ResponseWriter, r *http.Request) {
 	if err != nil {
 		return
 	}
-	n := &Node{Name: name, Conn: c}
+	n := &Node{Name: name, Conn: c, ConnectionID: fmt.Sprintf("%s-%d", name, time.Now().UnixNano())}
 	n.LastSeen.Store(time.Now().UnixNano())
+	n.LastHeartbeat.Store(time.Now().UnixNano())
+	n.Connected.Store(true)
 	m.mu.Lock()
-	if old := m.nodes[name]; old != nil {
+	old := m.nodes[name]
-		_ = old.Conn.Close()
-	}
 	m.nodes[name] = n
 	m.mu.Unlock()
+	if old != nil && old.Conn != nil {
+		_ = old.Conn.Close()
+	}
 	_ = n.write(Message{Event: "registered", Device: name, TS: time.Now().Unix()})
 	go m.heartbeat(n)
 	go m.readLoop(n)
@@ -107,33 +140,59 @@ func (n *Node) write(msg Message) error {
 
 func (m *Manager) readLoop(n *Node) {
 	defer func() {
-		m.mu.Lock()
+		n.Connected.Store(false)
-		if m.nodes[n.Name] == n {
+		conn := n.Conn
-			delete(m.nodes, n.Name)
+		m.mu.RLock()
+		current := m.nodes[n.Name] == n
+		m.mu.RUnlock()
+		if conn != nil {
+			_ = conn.Close()
 		}
-		m.mu.Unlock()
-		_ = n.Conn.Close()
 		n.Pending.Range(func(key, v any) bool {
 			if ch, ok := v.(chan Message); ok {
 				select {
 				case ch <- Message{Status: "error", Error: "device disconnected"}:
 				default:
 				}
-				n.Pending.Delete(key)
 			}
+			n.Pending.Delete(key)
 			return true
 		})
+		if current && m.Store != nil {
+			_ = m.Store.UpdateDeviceStatus(n.Name, "offline", n.LastHeartbeat.Load()/int64(time.Second))
+		}
 	}()
-	_ = n.Conn.SetReadDeadline(time.Now().Add(75 * time.Second))
+	conn := n.Conn
-	for {
+	if conn == nil {
-		var msg Message
-		if err := n.Conn.ReadJSON(&msg); err != nil {
 		return
 	}
-		n.LastSeen.Store(time.Now().UnixNano())
+	_ = conn.SetReadDeadline(time.Now().Add(75 * time.Second))
-		_ = n.Conn.SetReadDeadline(time.Now().Add(75 * time.Second))
+	for {
+		var msg Message
+		if err := conn.ReadJSON(&msg); err != nil {
+			return
+		}
+		now := time.Now().UnixNano()
+		n.LastSeen.Store(now)
+		_ = conn.SetReadDeadline(time.Now().Add(75 * time.Second))
+		if msg.Arch != "" {
+			n.Arch = msg.Arch
+		}
+		if msg.OS != "" {
+			n.OS = msg.OS
+		}
 		if msg.Profile != nil {
 			n.LastProfile = msg.Profile
+			n.LastHeartbeat.Store(now)
+			if m.Store != nil {
+				b, _ := json.Marshal(msg.Profile)
+				_ = m.Store.UpsertRemote(n.Name, "online", n.Arch, n.OS, now/int64(time.Second), string(b))
+			}
+		} else {
+			n.LastHeartbeat.Store(now)
+			if m.Store != nil {
+				_ = m.Store.UpdateDeviceStatus(n.Name, "online", now/int64(time.Second))
+			}
 		}
 		if msg.Event == "pong" || msg.Event == "ping" || msg.Event == "hello" || msg.Event == "profile" {
 			continue
@@ -153,21 +212,26 @@ func (m *Manager) readLoop(n *Node) {
 
 func (m *Manager) Online(name string) bool {
 	m.mu.RLock()
-	defer m.mu.RUnlock()
 	n := m.nodes[name]
-	return n != nil && time.Since(time.Unix(0, n.LastSeen.Load())) < 70*time.Second
+	m.mu.RUnlock()
+	if n == nil || !n.Connected.Load() {
+		return false
+	}
+	return time.Since(time.Unix(0, n.LastSeen.Load())) < deviceOfflineAfter
 }
 
 func (m *Manager) RevokeDevice(name, reason string) error {
 	m.mu.Lock()
-	n, exists := m.nodes[name]
+	n := m.nodes[name]
-	if exists {
 	delete(m.nodes, name)
+	m.mu.Unlock()
+	if n != nil {
+		n.Connected.Store(false)
+		if n.Conn != nil {
 			_ = n.write(Message{Event: "revoked", Error: "revoked by admin"})
 			_ = n.Conn.Close()
 		}
-	m.mu.Unlock()
+	}
-
 	if m.Store != nil {
 		return m.Store.RevokeDevice(name, reason)
 	}
@@ -179,16 +243,15 @@ func (m *Manager) Devices() []map[string]any {
 	defer m.mu.RUnlock()
 	out := make([]map[string]any, 0, len(m.nodes))
 	for name, n := range m.nodes {
-		status := "online"
+		status := "offline"
 		lastSeen := time.Unix(0, n.LastSeen.Load())
-		if time.Since(lastSeen) >= 70*time.Second {
+		if n.Connected.Load() && time.Since(lastSeen) < deviceOfflineAfter {
-			status = "offline"
+			status = "online"
 		}
 		item := map[string]any{
-			"name":           name,
+			"name": name, "status": status, "is_local": n.IsLocal,
-			"status":         status,
+			"arch": n.Arch, "os": n.OS,
-			"is_local":       false,
+			"last_heartbeat": n.LastHeartbeat.Load() / int64(time.Second),
-			"last_heartbeat": lastSeen.Unix(),
 		}
 		if n.LastProfile != nil {
 			item["profile"] = n.LastProfile

internal/cluster/protocol.go

@@ -7,6 +7,8 @@ type Message struct {
 	Event      string           `json:"event,omitempty"`
 	Action     string           `json:"action,omitempty"`
 	Device     string           `json:"device,omitempty"`
+	Arch       string           `json:"arch,omitempty"`
+	OS         string           `json:"os,omitempty"`
 	Status     string           `json:"status,omitempty"`
 	Payload    any              `json:"payload,omitempty"`
 	Profile    *sysinfo.Profile `json:"profile,omitempty"`

internal/storage/device_lifecycle_test.go

@@ -0,0 +1,51 @@
+package storage
+
+import (
+	"path/filepath"
+	"testing"
+)
+
+func TestDeviceLifecyclePersistence(t *testing.T) {
+	s, err := Open(filepath.Join(t.TempDir(), "commander.db"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer s.DB.Close()
+
+	if err := s.UpsertRemote("node1", "online", "amd64", "linux", 100, "{\"role\":\"APPLICATION\"}"); err != nil {
+		t.Fatal(err)
+	}
+	rows, err := s.ListDevices()
+	if err != nil || len(rows) != 1 {
+		t.Fatalf("rows=%d err=%v", len(rows), err)
+	}
+	if rows[0].Status != "online" || rows[0].Arch != "amd64" || rows[0].OS != "linux" {
+		t.Fatalf("unexpected row: %+v", rows[0])
+	}
+
+	if err := s.UpdateDeviceStatus("node1", "offline", 120); err != nil {
+		t.Fatal(err)
+	}
+	rows, err = s.ListDevices()
+	if err != nil || len(rows) != 1 {
+		t.Fatalf("rows=%d err=%v", len(rows), err)
+	}
+	if rows[0].Status != "offline" || rows[0].OfflineAt == nil {
+		t.Fatalf("offline state not persisted: %+v", rows[0])
+	}
+
+	if err := s.RevokeDevice("node1", "test"); err != nil {
+		t.Fatal(err)
+	}
+	rows, err = s.ListDevices()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(rows) != 0 {
+		t.Fatalf("revoked device still present: %+v", rows)
+	}
+	revoked, err := s.IsRevoked("node1")
+	if err != nil || !revoked {
+		t.Fatalf("revoked=%v err=%v", revoked, err)
+	}
+}

internal/storage/storage.go

@@ -18,8 +18,6 @@ func Open(path string) (*Store, error) {
 	if err != nil {
 		return nil, err
 	}
-	// SQLite has a single-writer model. Keep one application connection so
-	// concurrent callers queue instead of opening competing writer connections.
 	db.SetMaxOpenConns(1)
 	db.SetMaxIdleConns(1)
 	s := &Store{db}
@@ -31,28 +29,144 @@ func Open(path string) (*Store, error) {
 }
 
 func (s *Store) init() error {
-	if _, err := s.DB.Exec(`PRAGMA journal_mode = WAL`); err != nil {
+	if _, err := s.DB.Exec("PRAGMA journal_mode = WAL"); err != nil {
 		return err
 	}
-	if _, err := s.DB.Exec(`PRAGMA busy_timeout = 5000`); err != nil {
+	if _, err := s.DB.Exec("PRAGMA busy_timeout = 5000"); err != nil {
 		return err
 	}
-	_, err := s.DB.Exec(`CREATE TABLE IF NOT EXISTS devices (
+	_, err := s.DB.Exec("CREATE TABLE IF NOT EXISTS devices (" +
-		name TEXT PRIMARY KEY, status TEXT NOT NULL, is_local INTEGER NOT NULL,
+		"name TEXT PRIMARY KEY, status TEXT NOT NULL DEFAULT 'offline', is_local INTEGER NOT NULL DEFAULT 0, " +
-		arch TEXT, os TEXT, updated_at INTEGER NOT NULL
+		"arch TEXT, os TEXT, last_seen INTEGER NOT NULL DEFAULT 0, last_heartbeat INTEGER NOT NULL DEFAULT 0, " +
-	);	CREATE TABLE IF NOT EXISTS audit_logs (
+		"offline_at INTEGER, profile_json TEXT, created_at INTEGER NOT NULL DEFAULT 0, updated_at INTEGER NOT NULL DEFAULT 0); " +
-		id INTEGER PRIMARY KEY AUTOINCREMENT, timestamp INTEGER NOT NULL,
+		"CREATE TABLE IF NOT EXISTS audit_logs (" +
-		caller_ip TEXT, device TEXT, action TEXT, command TEXT,
+		"id INTEGER PRIMARY KEY AUTOINCREMENT, timestamp INTEGER NOT NULL, caller_ip TEXT, device TEXT, action TEXT, command TEXT, " +
-		exit_code INTEGER, duration_ms INTEGER, error_msg TEXT
+		"exit_code INTEGER, duration_ms INTEGER, error_msg TEXT); " +
-	);`)
+		"CREATE TABLE IF NOT EXISTS revoked_devices (name TEXT PRIMARY KEY, revoked_at INTEGER NOT NULL, reason TEXT);")
+	if err != nil {
+		return err
+	}
+	return s.migrateDevices()
+}
+
+func (s *Store) migrateDevices() error {
+	cols := map[string]bool{}
+	rows, err := s.DB.Query("PRAGMA table_info(devices)")
+	if err != nil {
+		return err
+	}
+	defer rows.Close()
+	for rows.Next() {
+		var cid, notnull, pk int
+		var name, typ string
+		var dflt sql.NullString
+		if err := rows.Scan(&cid, &name, &typ, &notnull, &dflt, &pk); err != nil {
+			return err
+		}
+		cols[name] = true
+	}
+	if err := rows.Err(); err != nil {
+		return err
+	}
+	migrations := []struct{ name, sql string }{
+		{"last_seen", "ALTER TABLE devices ADD COLUMN last_seen INTEGER NOT NULL DEFAULT 0"},
+		{"last_heartbeat", "ALTER TABLE devices ADD COLUMN last_heartbeat INTEGER NOT NULL DEFAULT 0"},
+		{"offline_at", "ALTER TABLE devices ADD COLUMN offline_at INTEGER"},
+		{"profile_json", "ALTER TABLE devices ADD COLUMN profile_json TEXT"},
+		{"created_at", "ALTER TABLE devices ADD COLUMN created_at INTEGER NOT NULL DEFAULT 0"},
+	}
+	for _, m := range migrations {
+		if !cols[m.name] {
+			if _, err := s.DB.Exec(m.sql); err != nil {
+				return err
+			}
+		}
+	}
+	_, err = s.DB.Exec("UPDATE devices SET created_at=CASE WHEN created_at=0 THEN updated_at ELSE created_at END, " +
+		"last_seen=CASE WHEN last_seen=0 THEN updated_at ELSE last_seen END, " +
+		"last_heartbeat=CASE WHEN last_heartbeat=0 THEN updated_at ELSE last_heartbeat END " +
+		"WHERE created_at=0 OR last_seen=0 OR last_heartbeat=0")
 	return err
 }
 
 func (s *Store) UpsertLocal(name, arch, osName string) error {
-	_, err := s.DB.Exec(`INSERT INTO devices(name,status,is_local,arch,os,updated_at)
+	now := time.Now().Unix()
-		VALUES(?,?,?,?,?,?) ON CONFLICT(name) DO UPDATE SET status=excluded.status,
+	_, err := s.DB.Exec("INSERT INTO devices(name,status,is_local,arch,os,last_seen,last_heartbeat,offline_at,profile_json,created_at,updated_at) "+
-		arch=excluded.arch, os=excluded.os, updated_at=excluded.updated_at`,
+		"VALUES(?,?,?,?,?,?,?,?,?,?,?) ON CONFLICT(name) DO UPDATE SET status='online', is_local=1, arch=excluded.arch, os=excluded.os, offline_at=NULL, updated_at=excluded.updated_at",
-		name, "online", 1, arch, osName, time.Now().Unix())
+		name, "online", 1, arch, osName, now, now, nil, nil, now, now)
+	return err
+}
+
+func (s *Store) UpsertRemote(name, status, arch, osName string, lastHeartbeat int64, profileJSON string) error {
+	now := time.Now().Unix()
+	if lastHeartbeat <= 0 {
+		lastHeartbeat = now
+	}
+	_, err := s.DB.Exec("INSERT INTO devices(name,status,is_local,arch,os,last_seen,last_heartbeat,offline_at,profile_json,created_at,updated_at) "+
+		"VALUES(?,?,?,?,?,?,?,?,?,?,?) ON CONFLICT(name) DO UPDATE SET status=excluded.status, is_local=0, arch=excluded.arch, os=excluded.os, "+
+		"last_seen=excluded.last_seen, last_heartbeat=excluded.last_heartbeat, offline_at=NULL, profile_json=excluded.profile_json, updated_at=excluded.updated_at",
+		name, status, 0, arch, osName, lastHeartbeat, lastHeartbeat, nil, profileJSON, now, now)
+	return err
+}
+
+func (s *Store) UpdateRemoteProfile(name string, lastHeartbeat int64, arch, osName, profileJSON string) error {
+	now := time.Now().Unix()
+	if lastHeartbeat <= 0 {
+		lastHeartbeat = now
+	}
+	_, err := s.DB.Exec("UPDATE devices SET status='online', arch=?, os=?, last_seen=?, last_heartbeat=?, offline_at=NULL, profile_json=?, updated_at=? WHERE name=? AND is_local=0",
+		arch, osName, lastHeartbeat, lastHeartbeat, profileJSON, now, name)
+	return err
+}
+
+func (s *Store) UpdateDeviceStatus(name, status string, lastHeartbeat int64) error {
+	now := time.Now().Unix()
+	if lastHeartbeat <= 0 {
+		lastHeartbeat = now
+	}
+	var offlineAt any
+	if status == "offline" {
+		offlineAt = now
+	}
+	_, err := s.DB.Exec("UPDATE devices SET status=?, last_seen=?, last_heartbeat=?, offline_at=?, updated_at=? WHERE name=? AND is_local=0",
+		status, lastHeartbeat, lastHeartbeat, offlineAt, now, name)
+	return err
+}
+
+type DeviceRecord struct {
+	Name, Status, Arch, OS, ProfileJSON string
+	IsLocal                             bool
+	LastSeen, LastHeartbeat             int64
+	OfflineAt                           *int64
+	UpdatedAt                           int64
+}
+
+func (s *Store) ListDevices() ([]DeviceRecord, error) {
+	rows, err := s.DB.Query("SELECT name,status,is_local,COALESCE(arch,''),COALESCE(os,''),last_seen,last_heartbeat,offline_at,COALESCE(profile_json,''),updated_at FROM devices ORDER BY name")
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []DeviceRecord
+	for rows.Next() {
+		var d DeviceRecord
+		var local int
+		var offline sql.NullInt64
+		if err := rows.Scan(&d.Name, &d.Status, &local, &d.Arch, &d.OS, &d.LastSeen, &d.LastHeartbeat, &offline, &d.ProfileJSON, &d.UpdatedAt); err != nil {
+			return nil, err
+		}
+		d.IsLocal = local != 0
+		if offline.Valid {
+			v := offline.Int64
+			d.OfflineAt = &v
+		}
+		out = append(out, d)
+	}
+	return out, rows.Err()
+}
+
+func (s *Store) DeleteDevice(name string) error {
+	_, err := s.DB.Exec("DELETE FROM devices WHERE name=? AND is_local=0", name)
 	return err
 }
 
@@ -69,8 +183,8 @@ type AuditLog struct {
 }
 
 func (s *Store) Audit(ip, device, action, command string, code int, ms int64, msg string) error {
-	_, err := s.DB.Exec(`INSERT INTO audit_logs(timestamp,caller_ip,device,action,command,exit_code,duration_ms,error_msg)
+	_, err := s.DB.Exec("INSERT INTO audit_logs(timestamp,caller_ip,device,action,command,exit_code,duration_ms,error_msg) VALUES(?,?,?,?,?,?,?,?)",
-		VALUES(?,?,?,?,?,?,?,?)`, time.Now().Unix(), ip, device, action, command, code, ms, msg)
+		time.Now().Unix(), ip, device, action, command, code, ms, msg)
 	return err
 }
 
@@ -81,8 +195,7 @@ func (s *Store) RecentAudits(limit int) ([]AuditLog, error) {
 	if limit > 500 {
 		limit = 500
 	}
-	rows, err := s.DB.Query(`SELECT id,timestamp,caller_ip,device,action,command,exit_code,duration_ms,error_msg
+	rows, err := s.DB.Query("SELECT id,timestamp,caller_ip,device,action,command,exit_code,duration_ms,error_msg FROM audit_logs ORDER BY id DESC LIMIT ?", limit)
-		FROM audit_logs ORDER BY id DESC LIMIT ?`, limit)
 	if err != nil {
 		return nil, err
 	}
@@ -98,29 +211,29 @@ func (s *Store) RecentAudits(limit int) ([]AuditLog, error) {
 	return out, rows.Err()
 }
 
-func (s *Store) InitRevocationTable() error {
-	_, err := s.DB.Exec(`CREATE TABLE IF NOT EXISTS revoked_devices (
-		name TEXT PRIMARY KEY,
-		revoked_at INTEGER NOT NULL,
-		reason TEXT
-	);`)
-	return err
-}
-
 func (s *Store) RevokeDevice(name, reason string) error {
-	_, err := s.DB.Exec(`INSERT INTO revoked_devices(name, revoked_at, reason)
+	tx, err := s.DB.Begin()
-		VALUES(?, ?, ?) ON CONFLICT(name) DO UPDATE SET revoked_at=excluded.revoked_at, reason=excluded.reason`,
+	if err != nil {
-		name, time.Now().Unix(), reason)
 		return err
+	}
+	defer tx.Rollback()
+	if _, err := tx.Exec("INSERT INTO revoked_devices(name,revoked_at,reason) VALUES(?,?,?) ON CONFLICT(name) DO UPDATE SET revoked_at=excluded.revoked_at,reason=excluded.reason",
+		name, time.Now().Unix(), reason); err != nil {
+		return err
+	}
+	if _, err := tx.Exec("DELETE FROM devices WHERE name=? AND is_local=0", name); err != nil {
+		return err
+	}
+	return tx.Commit()
 }
 
 func (s *Store) UnrevokeDevice(name string) error {
-	_, err := s.DB.Exec(`DELETE FROM revoked_devices WHERE name = ?`, name)
+	_, err := s.DB.Exec("DELETE FROM revoked_devices WHERE name = ?", name)
 	return err
 }
 
 func (s *Store) IsRevoked(name string) (bool, error) {
 	var count int
-	err := s.DB.QueryRow(`SELECT COUNT(*) FROM revoked_devices WHERE name = ?`, name).Scan(&count)
+	err := s.DB.QueryRow("SELECT COUNT(*) FROM revoked_devices WHERE name = ?", name).Scan(&count)
 	return count > 0, err
 }

internal/web/static/app.css

@@ -38,3 +38,5 @@ header strong{font-size:18px}header span{margin-left:12px;color:var(--text-muted
 .badge-docker-text{padding:1px 6px;border-radius:4px;font-size:11px;font-weight:700}
 .badge-docker-text.yes{background:rgba(34,197,94,.15);color:var(--dot-online);border:1px solid rgba(34,197,94,.3)}
 .badge-docker-text.no{background:rgba(148,163,184,.15);color:var(--text-muted);border:1px solid var(--border)}
+.device-card.offline{opacity:.62;filter:saturate(.45)}
+.device-card.offline .btn-revoke{opacity:1}

internal/web/static/app.js

@@ -38,7 +38,7 @@ async function loadDevices(){
     const p = d.profile || {};
     const role = p.role || "APPLICATION";
     const isOnline = d.status === "online";
-    const statusText = isOnline ? "在线" : "离线";
+    const statusText = isOnline ? "在线" : "离线";\n    const lastText = d.last_heartbeat ? new Date(d.last_heartbeat*1000).toLocaleString() : "";
     const archOs = (d.arch || d.os) ? `${esc(d.arch||"")}/${esc(d.os||"")} · ` : "";
     const cpuStr = p.cpu_cores ? `${p.cpu_cores}C · ${p.cpu_usage_percent ?? 0}%` : '-';
     const loadStr = p.load_1m !== undefined ? p.load_1m.toFixed(2) : '-';
@@ -58,7 +58,7 @@ async function loadDevices(){
             </div>
             <button class="btn-revoke" onclick="removeDevice('${esc(d.name)}')">注销</button>
           </div>
-          <div class="v1-row2">${archOs}${statusText}</div>
+          <div class="v1-row2">${archOs}${statusText}${isOnline ? "" : (lastText ? " · 最后活跃: "+lastText : "")}</div>
         </div>
         <div class="profile-grid">
           <div class="p-item"><span class="p-label">CPU</span><span class="p-val">${cpuStr}</span></div>
@@ -72,7 +72,7 @@ async function loadDevices(){
     `;
   }).join("");
 
-  $("#device").innerHTML=ds.map(d=>'<option>'+esc(d.name)+'</option>').join("");
+  $("#device").innerHTML=ds.map(d=>`<option value="${esc(d.name)}" ${d.status==="offline" ? "disabled" : ""}>${esc(d.name)}${d.status==="offline" ? " [离线]" : ""}</option>`).join("");
 }
 
 async function loadAudits(){