feat(logging): implement client log streaming and management

- Added log streaming functionality for clients, allowing real-time log access via SSE.
- Introduced LogHandler to manage log streaming requests and responses.
- Implemented LogSessionManager to handle active log sessions and listeners.
- Enhanced protocol with log-related message types and structures.
- Created Logger for client-side logging, supporting various log levels and file output.
- Developed LogViewer component for the web interface to display and filter logs.
- Updated API to support log stream creation and management.
- Added support for querying logs by level and searching through log messages.

internal/server/tunnel/log_session.go

@@ -0,0 +1,155 @@
+package tunnel
+
+import (
+	"net"
+	"sync"
+
+	"github.com/gotunnel/pkg/protocol"
+)
+
+// LogSessionManager 管理所有活跃的日志会话
+type LogSessionManager struct {
+	sessions map[string]*LogSession
+	mu       sync.RWMutex
+}
+
+// LogSession 日志流会话
+type LogSession struct {
+	ID        string
+	ClientID  string
+	Stream    net.Conn
+	listeners []chan protocol.LogEntry
+	mu        sync.Mutex
+	closed    bool
+}
+
+// NewLogSessionManager 创建日志会话管理器
+func NewLogSessionManager() *LogSessionManager {
+	return &LogSessionManager{
+		sessions: make(map[string]*LogSession),
+	}
+}
+
+// CreateSession 创建日志会话
+func (m *LogSessionManager) CreateSession(clientID, sessionID string, stream net.Conn) *LogSession {
+	session := &LogSession{
+		ID:        sessionID,
+		ClientID:  clientID,
+		Stream:    stream,
+		listeners: make([]chan protocol.LogEntry, 0),
+	}
+
+	m.mu.Lock()
+	m.sessions[sessionID] = session
+	m.mu.Unlock()
+
+	return session
+}
+
+// GetSession 获取会话
+func (m *LogSessionManager) GetSession(sessionID string) *LogSession {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	return m.sessions[sessionID]
+}
+
+// RemoveSession 移除会话
+func (m *LogSessionManager) RemoveSession(sessionID string) {
+	m.mu.Lock()
+	if session, ok := m.sessions[sessionID]; ok {
+		session.Close()
+		delete(m.sessions, sessionID)
+	}
+	m.mu.Unlock()
+}
+
+// GetSessionsByClient 获取客户端的所有会话
+func (m *LogSessionManager) GetSessionsByClient(clientID string) []*LogSession {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	var sessions []*LogSession
+	for _, session := range m.sessions {
+		if session.ClientID == clientID {
+			sessions = append(sessions, session)
+		}
+	}
+	return sessions
+}
+
+// CleanupClientSessions 清理客户端的所有会话
+func (m *LogSessionManager) CleanupClientSessions(clientID string) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	for id, session := range m.sessions {
+		if session.ClientID == clientID {
+			session.Close()
+			delete(m.sessions, id)
+		}
+	}
+}
+
+// AddListener 添加监听器
+func (s *LogSession) AddListener() <-chan protocol.LogEntry {
+	ch := make(chan protocol.LogEntry, 100)
+	s.mu.Lock()
+	s.listeners = append(s.listeners, ch)
+	s.mu.Unlock()
+	return ch
+}
+
+// RemoveListener 移除监听器
+func (s *LogSession) RemoveListener(ch <-chan protocol.LogEntry) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	for i, listener := range s.listeners {
+		if listener == ch {
+			close(listener)
+			s.listeners = append(s.listeners[:i], s.listeners[i+1:]...)
+			break
+		}
+	}
+}
+
+// Broadcast 广播日志条目到所有监听器
+func (s *LogSession) Broadcast(entry protocol.LogEntry) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	for _, ch := range s.listeners {
+		select {
+		case ch <- entry:
+		default:
+			// 监听器太慢，丢弃日志
+		}
+	}
+}
+
+// Close 关闭会话
+func (s *LogSession) Close() {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if s.closed {
+		return
+	}
+	s.closed = true
+
+	for _, ch := range s.listeners {
+		close(ch)
+	}
+	s.listeners = nil
+
+	if s.Stream != nil {
+		s.Stream.Close()
+	}
+}
+
+// IsClosed 检查会话是否已关闭
+func (s *LogSession) IsClosed() bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	return s.closed
+}

internal/server/tunnel/server.go

@@ -65,6 +65,7 @@ type Server struct {
 	listener       net.Listener    // 主监听器
 	shutdown       chan struct{}   // 关闭信号
 	wg             sync.WaitGroup  // 等待所有连接关闭
+	logSessions    *LogSessionManager // 日志会话管理器
 }
 
 // JSPluginEntry JS 插件条目
@@ -102,6 +103,7 @@ func NewServer(cs db.ClientStore, bindAddr string, bindPort int, token string, h
 		clients:     make(map[string]*ClientSession),
 		connSem:     make(chan struct{}, maxConnections),
 		shutdown:    make(chan struct{}),
+		logSessions: NewLogSessionManager(),
 	}
 }
 
@@ -1474,3 +1476,96 @@ func (s *Server) SendUpdateToClient(clientID, downloadURL string) error {
 	log.Printf("[Server] Update command sent to client %s: %s", clientID, downloadURL)
 	return nil
 }
+
+// StartClientLogStream 启动客户端日志流
+func (s *Server) StartClientLogStream(clientID, sessionID string, lines int, follow bool, level string) (<-chan protocol.LogEntry, error) {
+	s.mu.RLock()
+	cs, ok := s.clients[clientID]
+	s.mu.RUnlock()
+
+	if !ok {
+		return nil, fmt.Errorf("client %s not found or not online", clientID)
+	}
+
+	// 打开到客户端的流
+	stream, err := cs.Session.Open()
+	if err != nil {
+		return nil, err
+	}
+
+	// 发送日志请求
+	req := protocol.LogRequest{
+		SessionID: sessionID,
+		Lines:     lines,
+		Follow:    follow,
+		Level:     level,
+	}
+	msg, _ := protocol.NewMessage(protocol.MsgTypeLogRequest, req)
+	if err := protocol.WriteMessage(stream, msg); err != nil {
+		stream.Close()
+		return nil, err
+	}
+
+	// 创建会话
+	session := s.logSessions.CreateSession(clientID, sessionID, stream)
+	listener := session.AddListener()
+
+	// 启动 goroutine 读取客户端日志
+	go s.readClientLogs(session, stream)
+
+	return listener, nil
+}
+
+// readClientLogs 读取客户端日志并广播到监听器
+func (s *Server) readClientLogs(session *LogSession, stream net.Conn) {
+	defer s.logSessions.RemoveSession(session.ID)
+
+	for {
+		msg, err := protocol.ReadMessage(stream)
+		if err != nil {
+			return
+		}
+
+		if msg.Type != protocol.MsgTypeLogData {
+			continue
+		}
+
+		var data protocol.LogData
+		if err := msg.ParsePayload(&data); err != nil {
+			continue
+		}
+
+		for _, entry := range data.Entries {
+			session.Broadcast(entry)
+		}
+
+		if data.EOF {
+			return
+		}
+	}
+}
+
+// StopClientLogStream 停止客户端日志流
+func (s *Server) StopClientLogStream(sessionID string) {
+	session := s.logSessions.GetSession(sessionID)
+	if session == nil {
+		return
+	}
+
+	// 发送停止请求到客户端
+	s.mu.RLock()
+	cs, ok := s.clients[session.ClientID]
+	s.mu.RUnlock()
+
+	if ok {
+		stream, err := cs.Session.Open()
+		if err == nil {
+			req := protocol.LogStopRequest{SessionID: sessionID}
+			msg, _ := protocol.NewMessage(protocol.MsgTypeLogStop, req)
+			protocol.WriteMessage(stream, msg)
+			stream.Close()
+		}
+	}
+
+	s.logSessions.RemoveSession(sessionID)
+}