0f4cff89a2
- Added RedisMessageBus for message distribution using Redis Pub/Sub. - Introduced LocalMessageBus as a no-op implementation for single-server mode. - Created messagebus interface for abstraction of message distribution. - Implemented awareness management methods: SetAwareness, GetAllAwareness, DeleteAwareness, and ClearAllAwareness. - Added logger utility for structured logging with zap. - Refactored SniffYjsClientIDs and MakeYjsDeleteMessage functions for improved readability.
648 lines
18 KiB
Go
648 lines
18 KiB
Go
package hub
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import (
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"context"
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"sync"
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"time"
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"github.com/M1ngdaXie/realtime-collab/internal/messagebus"
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"github.com/google/uuid"
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"github.com/gorilla/websocket"
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"go.uber.org/zap"
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)
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type Message struct {
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RoomID string
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Data []byte
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sender *Client
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}
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type Client struct {
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ID string
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UserID *uuid.UUID // Authenticated user ID (nil for public share access)
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UserName string // User's display name for presence
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UserAvatar *string // User's avatar URL for presence
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Permission string // User's permission level: "owner", "edit", "view"
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Conn *websocket.Conn
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send chan []byte
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sendMu sync.Mutex
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sendClosed bool
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hub *Hub
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roomID string
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mutex sync.Mutex
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unregisterOnce sync.Once
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failureCount int
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failureMu sync.Mutex
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observedYjsIDs map[uint64]uint64 // clientID -> maxClock
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idsMu sync.Mutex
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}
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type Room struct {
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ID string
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clients map[*Client]bool
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mu sync.RWMutex
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cancel context.CancelFunc
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}
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type Hub struct {
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rooms map[string]*Room
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mu sync.RWMutex
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Register chan *Client // Exported
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Unregister chan *Client // Exported
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Broadcast chan *Message // Exported
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//redis pub/sub config
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messagebus messagebus.MessageBus
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logger *zap.Logger
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serverID string
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fallbackMode bool
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}
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func NewHub(messagebus messagebus.MessageBus, serverID string, logger *zap.Logger) *Hub {
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return &Hub{
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rooms: make(map[string]*Room),
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Register: make(chan *Client, 256),
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Unregister: make(chan *Client, 256),
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Broadcast: make(chan *Message, 4096),
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// redis
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messagebus: messagebus,
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serverID: serverID,
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logger: logger,
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fallbackMode: false, // 默认 Redis 正常工作
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}
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}
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func (h *Hub) Run() {
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for {
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select {
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case client := <-h.Register:
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h.registerClient(client)
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case client := <-h.Unregister:
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h.unregisterClient(client)
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case message := <-h.Broadcast:
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h.broadcastMessage(message)
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}
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}
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}
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func (h *Hub) registerClient(client *Client) {
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h.mu.Lock()
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defer h.mu.Unlock()
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room, exists := h.rooms[client.roomID]
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// --- 1. 初始化房间 (仅针对该服务器上的第一个人) ---
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if !exists {
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room = &Room{
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ID: client.roomID,
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clients: make(map[*Client]bool),
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cancel: nil,
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// lastAwareness 已被我们从结构体中物理删除或不再使用
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}
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h.rooms[client.roomID] = room
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h.logger.Info("Created new local room instance", zap.String("room_id", client.roomID))
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// 开启跨服订阅
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if !h.fallbackMode && h.messagebus != nil {
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ctx, cancel := context.WithCancel(context.Background())
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room.cancel = cancel
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msgChan, err := h.messagebus.Subscribe(ctx, client.roomID)
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if err != nil {
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h.logger.Error("Redis Subscribe failed", zap.Error(err))
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cancel()
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room.cancel = nil
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} else {
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// 启动转发协程：确保以后别的服务器的消息能传给这台机器的人
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go h.startRoomMessageForwarding(ctx, client.roomID, msgChan)
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}
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}
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}
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// --- 2. 将客户端加入本地房间列表 ---
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room.mu.Lock()
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room.clients[client] = true
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room.mu.Unlock()
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h.logger.Info("Client linked to room", zap.String("client_id", client.ID))
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// --- 3. 核心改进：立刻同步全量状态 ---
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// 无论是不是第一个人，只要有人进来，我们就去 Redis 抓取所有人的状态发给他
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// hub/hub.go 内部的 registerClient 函数
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// ... 之前的代码保持不变 ...
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if !h.fallbackMode && h.messagebus != nil {
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go func(c *Client) {
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ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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// 1. 从 Redis 抓取
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awarenessMap, err := h.messagebus.GetAllAwareness(ctx, c.roomID)
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if err != nil {
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h.logger.Error("Redis sync failed in goroutine",
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zap.String("client_id", c.ID),
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zap.Error(err))
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return
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}
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if len(awarenessMap) == 0 {
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h.logger.Debug("No awareness data found in Redis for sync", zap.String("room_id", c.roomID))
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return
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}
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h.logger.Info("Starting state delivery to joiner",
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zap.String("client_id", c.ID),
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zap.Int("items", len(awarenessMap)))
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// 2. 逐条发送，带锁保护
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sentCount := 0
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for clientID, data := range awarenessMap {
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c.sendMu.Lock()
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// 🛑 核心防御：检查通道是否已被 unregisterClient 关闭
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if c.sendClosed {
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c.sendMu.Unlock()
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h.logger.Warn("Sync aborted: client channel closed while sending",
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zap.String("client_id", c.ID),
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zap.Uint64("target_yjs_id", clientID))
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return // 直接退出协程，不发了
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}
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select {
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case c.send <- data:
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sentCount++
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default:
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// 缓冲区满了（通常是因为网络太卡），记录一条警告
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h.logger.Warn("Sync item skipped: client send buffer full",
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zap.String("client_id", c.ID),
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zap.Uint64("target_yjs_id", clientID))
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}
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c.sendMu.Unlock()
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}
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h.logger.Info("State sync completed successfully",
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zap.String("client_id", c.ID),
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zap.Int("delivered", sentCount))
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}(client)
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}
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}
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func (h *Hub) unregisterClient(client *Client) {
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h.mu.Lock()
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// 注意：这里不使用 defer，因为我们需要根据逻辑流手动释放锁，避免阻塞后续的 Redis 操作
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room, exists := h.rooms[client.roomID]
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if !exists {
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h.mu.Unlock()
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return
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}
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// 1. 局部清理：从房间内移除客户端
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room.mu.Lock()
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if _, ok := room.clients[client]; ok {
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delete(room.clients, client)
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// 安全关闭客户端的发送管道
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client.sendMu.Lock()
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if !client.sendClosed {
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close(client.send)
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client.sendClosed = true
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}
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client.sendMu.Unlock()
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}
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remainingClientsCount := len(room.clients)
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room.mu.Unlock()
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h.logger.Info("Unregistered client from room",
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zap.String("client_id", client.ID),
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zap.String("room_id", client.roomID),
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zap.Int("remaining_clients", remainingClientsCount),
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)
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// 2. 分布式清理：删除 Redis 中的感知数据 (Awareness)
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if !h.fallbackMode && h.messagebus != nil {
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go func() {
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// 使用带超时的 Context 执行删除
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ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
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defer cancel()
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client.idsMu.Lock()
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// 遍历该客户端在本机观察到的所有 Yjs ID
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for clientID := range client.observedYjsIDs {
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err := h.messagebus.DeleteAwareness(ctx, client.roomID, clientID)
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h.logger.Info("DEBUG: IDs to cleanup",
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zap.String("client_id", client.ID),
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zap.Any("ids", client.observedYjsIDs))
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if err != nil {
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h.logger.Warn("Failed to delete awareness from Redis",
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zap.Uint64("yjs_id", clientID),
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zap.Error(err),
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)
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}
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}
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client.idsMu.Unlock()
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}()
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}
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// 3. 协作清理：发送“僵尸删除”消息给其他幸存者
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if remainingClientsCount > 0 {
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client.idsMu.Lock()
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clientClocks := make(map[uint64]uint64, len(client.observedYjsIDs))
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for id, clock := range client.observedYjsIDs {
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clientClocks[id] = clock
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}
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client.idsMu.Unlock()
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if len(clientClocks) > 0 {
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// 构造 Yjs 协议格式的删除消息
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deleteMsg := MakeYjsDeleteMessage(clientClocks)
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msg := &Message{
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RoomID: client.roomID,
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Data: deleteMsg,
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sender: nil, // 系统发送
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}
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// 异步发送到广播通道，避免在持有 h.mu 时发生死锁
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go func() {
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select {
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case h.Broadcast <- msg:
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case <-time.After(500 * time.Millisecond):
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h.logger.Error("Critical: Failed to broadcast cleanup message (channel blocked)")
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}
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}()
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}
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}
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// 4. 房间清理：如果是最后一个人，彻底销毁房间资源
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if remainingClientsCount == 0 {
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h.logger.Info("Room is empty, performing deep cleanup", zap.String("room_id", client.roomID))
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// A. 停止转发协程
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if room.cancel != nil {
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room.cancel()
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}
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// B. 分布式彻底清理 (关键改动！)
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if !h.fallbackMode && h.messagebus != nil {
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go func(rID string) {
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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// ✨ 1. 直接删除整个 Redis Hash 表，不留任何死角
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if err := h.messagebus.ClearAllAwareness(ctx, rID); err != nil {
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h.logger.Warn("Failed to clear total awareness from Redis", zap.Error(err))
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}
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// 2. 取消订阅
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if err := h.messagebus.Unsubscribe(ctx, rID); err != nil {
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h.logger.Warn("Failed to unsubscribe", zap.Error(err))
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}
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}(client.roomID)
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}
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// C. 从内存中移除
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delete(h.rooms, client.roomID)
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}
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h.mu.Unlock() // 手动释放 Hub 锁
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}
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const (
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writeWait = 10 * time.Second
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pongWait = 60 * time.Second
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pingPeriod = (pongWait * 9) / 10 // 54 seconds
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maxSendFailures = 5
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)
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func (h *Hub) broadcastMessage(message *Message) {
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h.mu.RLock()
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room, exists := h.rooms[message.RoomID]
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h.mu.RUnlock()
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if !exists {
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// 如果房间不存在，没必要继续
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return
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}
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// 1. 处理 Awareness 缓存 (Type 1)
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// if len(message.Data) > 0 && message.Data[0] == 1 {
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// room.mu.Lock()
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// room.lastAwareness = make([]byte, len(message.Data))
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// copy(room.lastAwareness, message.Data)
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// room.mu.Unlock()
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// }
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// 2. 本地广播
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h.broadcastToLocalClients(room, message.Data, message.sender)
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// 只有本地客户端发出的消息 (sender != nil) 才推送到 Redis
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if message.sender != nil && !h.fallbackMode && h.messagebus != nil {
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go func() { // 建议异步 Publish，不阻塞 Hub 的主循环
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ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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err := h.messagebus.Publish(ctx, message.RoomID, message.Data)
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if err != nil {
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h.logger.Error("MessageBus publish failed",
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zap.String("room_id", message.RoomID),
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zap.Error(err),
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)
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}
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}()
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}
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}
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func (h *Hub) broadcastToLocalClients(room *Room, data []byte, sender *Client) {
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room.mu.RLock()
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defer room.mu.RUnlock()
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// 2. 遍历房间内所有本地连接的客户端
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for client := range room.clients {
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// 3. 排除发送者（如果是从 Redis 来的消息，sender 通常为 nil）
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if client != sender {
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select {
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case client.send <- data:
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// 发送成功：重置该客户端的失败计数
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client.failureMu.Lock()
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client.failureCount = 0
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client.failureMu.Unlock()
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default:
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client.handleSendFailure()
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}
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}
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}
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}
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func (h *Hub) startRoomMessageForwarding(ctx context.Context, roomID string, msgChan <-chan []byte) {
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h.logger.Info("Starting message forwarding from Redis to room",
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zap.String("room_id", roomID),
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zap.String("server_id", h.serverID),
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)
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for {
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select {
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case <-ctx.Done():
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h.logger.Info("Stopping Redis message forwarding", zap.String("room_id", roomID))
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return
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case data, ok := <-msgChan:
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if !ok {
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h.logger.Warn("Redis message channel closed for room", zap.String("room_id", roomID))
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return
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}
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// 1. 日志记录：记录消息类型和长度
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msgType := byte(0)
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if len(data) > 0 {
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msgType = data[0]
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}
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h.logger.Debug("Received message from Redis",
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zap.String("room_id", roomID),
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zap.Int("bytes", len(data)),
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zap.Uint8("msg_type", msgType),
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)
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// 2. 获取本地房间对象
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h.mu.RLock()
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room, exists := h.rooms[roomID]
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h.mu.RUnlock()
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if !exists {
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// 这种情况常见于：Redis 消息飞过来时，本地最后一个用户刚好断开删除了房间
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h.logger.Warn("Received Redis message but room does not exist locally",
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zap.String("room_id", roomID),
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)
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continue
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}
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// 3. 广播给本地所有客户端
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// sender=nil 确保每个人（包括原本发送这条消息的人，如果他在本台机器上）都能收到
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h.broadcastToLocalClients(room, data, nil)
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// 4. 如果是感知数据 (Awareness)，更新房间缓存
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// 这样后来加入的用户能立即看到其他人的光标
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// if len(data) > 0 && data[0] == 1 {
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// room.mu.Lock()
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// room.lastAwareness = make([]byte, len(data))
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// copy(room.lastAwareness, data)
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// room.mu.Unlock()
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// }
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}
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}
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}
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// 辅助方法：处理发送失败逻辑，保持代码整洁 (DRY 原则)
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func (c *Client) handleSendFailure() {
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c.failureMu.Lock()
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c.failureCount++
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currentFailures := c.failureCount
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c.failureMu.Unlock()
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// 直接通过 c.hub 访问日志，代码非常自然
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c.hub.logger.Warn("Failed to send message to client",
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zap.String("clientID", c.ID),
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zap.String("roomID", c.roomID),
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zap.Int("failures", currentFailures),
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zap.Int("max", maxSendFailures),
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)
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if currentFailures >= maxSendFailures {
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c.hub.logger.Error("Client exceeded max failures, disconnecting",
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zap.String("clientID", c.ID))
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// 这里的异步处理很正确，防止阻塞当前的广播循环
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go func() {
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c.unregister()
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c.Conn.Close()
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}()
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}
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}
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func (h *Hub) SetFallbackMode(fallback bool) {
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h.mu.Lock()
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// 1. 检查状态是否有变化（幂等性）
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if h.fallbackMode == fallback {
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h.mu.Unlock()
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return
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}
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// 2. 更新状态并记录日志
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h.fallbackMode = fallback
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if fallback {
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h.logger.Warn("Hub entering FALLBACK MODE (local-only communication)")
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} else {
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h.logger.Info("Hub restored to DISTRIBUTED MODE (cross-server sync enabled)")
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}
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// 3. 如果是从备用模式恢复 (fallback=false)，需要重新激活所有房间的 Redis 订阅
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if !fallback && h.messagebus != nil {
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h.logger.Info("Recovering Redis subscriptions for existing rooms", zap.Int("room_count", len(h.rooms)))
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for roomID, room := range h.rooms {
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// 先清理旧的订阅句柄（如果有残留）
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if room.cancel != nil {
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room.cancel()
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room.cancel = nil
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}
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// 为每个房间重新开启订阅
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ctx, cancel := context.WithCancel(context.Background())
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room.cancel = cancel
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|
||
// 尝试重新订阅
|
||
msgChan, err := h.messagebus.Subscribe(ctx, roomID)
|
||
if err != nil {
|
||
h.logger.Error("Failed to re-subscribe during recovery",
|
||
zap.String("room_id", roomID),
|
||
zap.Error(err),
|
||
)
|
||
cancel()
|
||
room.cancel = nil
|
||
continue
|
||
}
|
||
|
||
// 重新启动转发协程
|
||
go h.startRoomMessageForwarding(ctx, roomID, msgChan)
|
||
|
||
h.logger.Debug("Successfully re-synced room with Redis", zap.String("room_id", roomID))
|
||
}
|
||
}
|
||
h.mu.Unlock()
|
||
}
|
||
func (c *Client) ReadPump() {
|
||
c.Conn.SetReadDeadline(time.Now().Add(pongWait))
|
||
c.Conn.SetPongHandler(func(string) error {
|
||
c.Conn.SetReadDeadline(time.Now().Add(pongWait))
|
||
return nil
|
||
})
|
||
defer func() {
|
||
c.unregister()
|
||
c.Conn.Close()
|
||
}()
|
||
|
||
for {
|
||
messageType, message, err := c.Conn.ReadMessage()
|
||
if err != nil {
|
||
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
|
||
c.hub.logger.Warn("Unexpected WebSocket close",
|
||
zap.String("client_id", c.ID),
|
||
zap.Error(err))
|
||
}
|
||
break
|
||
}
|
||
|
||
// 1. Sniff Yjs client IDs from awareness messages (before broadcast)
|
||
if messageType == websocket.BinaryMessage && len(message) > 0 && message[0] == 1 {
|
||
clockMap := SniffYjsClientIDs(message)
|
||
if len(clockMap) > 0 {
|
||
c.idsMu.Lock()
|
||
for id, clock := range clockMap {
|
||
if clock > c.observedYjsIDs[id] {
|
||
c.hub.logger.Debug("Sniffed Yjs client ID",
|
||
zap.String("client_id", c.ID),
|
||
zap.Uint64("yjs_id", id),
|
||
zap.Uint64("clock", clock))
|
||
c.observedYjsIDs[id] = clock
|
||
}
|
||
}
|
||
c.idsMu.Unlock()
|
||
|
||
// Cache awareness in Redis for cross-server sync
|
||
if !c.hub.fallbackMode && c.hub.messagebus != nil {
|
||
go func(cm map[uint64]uint64, msg []byte) {
|
||
ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
|
||
defer cancel()
|
||
for clientID := range cm {
|
||
if err := c.hub.messagebus.SetAwareness(ctx, c.roomID, clientID, msg); err != nil {
|
||
c.hub.logger.Warn("Failed to cache awareness in Redis",
|
||
zap.Uint64("yjs_id", clientID),
|
||
zap.Error(err))
|
||
}
|
||
}
|
||
}(clockMap, message)
|
||
}
|
||
}
|
||
}
|
||
|
||
// 2. Permission check - block write operations from view-only users
|
||
if c.Permission == "view" {
|
||
isSyncMessage := len(message) > 0 && message[0] == 0
|
||
isUpdateOp := len(message) > 1 && message[1] == 2
|
||
|
||
if isSyncMessage && isUpdateOp {
|
||
c.hub.logger.Warn("Blocked write from view-only user",
|
||
zap.String("client_id", c.ID))
|
||
continue
|
||
}
|
||
// Allow: Awareness (type=1), SyncStep1/2 (type=0, subtype=0/1)
|
||
}
|
||
|
||
// 3. Broadcast to room
|
||
if messageType == websocket.BinaryMessage {
|
||
select {
|
||
case c.hub.Broadcast <- &Message{
|
||
RoomID: c.roomID,
|
||
Data: message,
|
||
sender: c,
|
||
}:
|
||
default:
|
||
c.hub.logger.Warn("Hub broadcast channel full, dropping message",
|
||
zap.String("client_id", c.ID))
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
func (c *Client) WritePump() {
|
||
ticker := time.NewTicker(pingPeriod)
|
||
defer func() {
|
||
ticker.Stop()
|
||
c.unregister()
|
||
c.Conn.Close()
|
||
}()
|
||
|
||
for {
|
||
select {
|
||
case message, ok := <-c.send:
|
||
c.Conn.SetWriteDeadline(time.Now().Add(writeWait))
|
||
if !ok {
|
||
c.Conn.WriteMessage(websocket.CloseMessage, []byte{})
|
||
return
|
||
}
|
||
|
||
if err := c.Conn.WriteMessage(websocket.BinaryMessage, message); err != nil {
|
||
c.hub.logger.Warn("Error writing message to client",
|
||
zap.String("client_id", c.ID),
|
||
zap.Error(err))
|
||
return
|
||
}
|
||
|
||
case <-ticker.C:
|
||
c.Conn.SetWriteDeadline(time.Now().Add(writeWait))
|
||
if err := c.Conn.WriteMessage(websocket.PingMessage, nil); err != nil {
|
||
c.hub.logger.Debug("Ping failed for client",
|
||
zap.String("client_id", c.ID),
|
||
zap.Error(err))
|
||
return
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
func NewClient(id string, userID *uuid.UUID, userName string, userAvatar *string, permission string, conn *websocket.Conn, hub *Hub, roomID string) *Client {
|
||
return &Client{
|
||
ID: id,
|
||
UserID: userID,
|
||
UserName: userName,
|
||
UserAvatar: userAvatar,
|
||
Permission: permission,
|
||
Conn: conn,
|
||
send: make(chan []byte, 1024),
|
||
hub: hub,
|
||
roomID: roomID,
|
||
observedYjsIDs: make(map[uint64]uint64),
|
||
}
|
||
}
|
||
func (c *Client) unregister() {
|
||
c.unregisterOnce.Do(func() {
|
||
c.hub.Unregister <- c
|
||
})
|
||
}
|