XEngineers/CamTalk
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feat: 优化对话历史功能

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This commit is contained in:
cfy666
2026-06-20 19:57:36 +08:00
parent 2a7d4c74d4
commit ab07e01adf
15 changed files with 653 additions and 174 deletions
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1
backend/internal/session/manager.go
View File

@@ -18,6 +18,7 @@ type ConversationSummary struct {
Title string `json:"title"`
LastMessage string `json:"last_message"`
MessageCount int `json:"message_count"`
CreatedAt time.Time `json:"created_at"`
UpdatedAt time.Time `json:"updated_at"`
}

44
backend/internal/session/memory.go
View File

@@ -142,11 +142,11 @@ func (m *MemoryManager) Create(ctx context.Context, userID string, config models
}
m.mu.Unlock()
// Write-Through：异步写 PG
// Write-Through：异步写 PG（使用 Background context，避免 HTTP 请求结束后 context 被取消）
if m.sessRepo != nil {
go func() {
cfgJSON, _ := json.Marshal(config)
if err := m.sessRepo.Save(ctx, store.SessionRecord{
if err := m.sessRepo.Save(context.Background(), store.SessionRecord{
ID: id, UserID: userID, Title: models.DefaultSessionTitle,
Config: cfgJSON, CreatedAt: now, UpdatedAt: now,
}); err != nil {
@@ -204,11 +204,11 @@ func (m *MemoryManager) UpdateConfig(ctx context.Context, sessionID string, patc
cfg := entry.session.Config
m.mu.Unlock()
// Write-Through：异步更新 PG
// Write-Through：异步更新 PG（使用 Background context）
if m.sessRepo != nil {
go func() {
cfgJSON, _ := json.Marshal(cfg)
if err := m.sessRepo.UpdateConfig(ctx, sessionID, cfgJSON); err != nil {
if err := m.sessRepo.UpdateConfig(context.Background(), sessionID, cfgJSON); err != nil {
logger.Log.Warnw("update session config in DB failed", "session", sessionID, "error", err)
}
}()
@@ -233,10 +233,10 @@ func (m *MemoryManager) UpdateTitle(ctx context.Context, sessionID string, title
entry.lastActive = time.Now()
m.mu.Unlock()
// Write-Through：异步更新 PG
// Write-Through：异步更新 PG（使用 Background context）
if m.sessRepo != nil {
go func() {
if err := m.sessRepo.UpdateTitle(ctx, sessionID, title); err != nil {
if err := m.sessRepo.UpdateTitle(context.Background(), sessionID, title); err != nil {
logger.Log.Warnw("update session title in DB failed", "session", sessionID, "error", err)
}
}()
@@ -271,6 +271,7 @@ func (m *MemoryManager) ListByUser(ctx context.Context, userID string, page, siz
list = append(list, ConversationSummary{
ID: rec.ID,
Title: rec.Title,
CreatedAt: rec.CreatedAt,
UpdatedAt: rec.UpdatedAt,
})
sessionIDs = append(sessionIDs, rec.ID)
@@ -320,6 +321,7 @@ func (m *MemoryManager) listByUserFromMemory(ctx context.Context, userID string,
summary := ConversationSummary{
ID: entry.session.ID,
Title: entry.session.Title,
CreatedAt: entry.session.CreatedAt,
UpdatedAt: entry.lastActive,
}
summary.MessageCount = len(entry.history)
@@ -394,8 +396,10 @@ func (m *MemoryManager) AppendMessage(_ context.Context, sessionID string, msg m
entry.history = append(entry.history, msg)
// 自动更新标题：首条 user 消息时，如果标题为默认值，自动更新为消息前 20 字符
titleUpdated := false
if msg.Role == "user" && entry.session.Title == models.DefaultSessionTitle {
entry.session.Title = generateTitle(msg.Content)
titleUpdated = true
}
// 超过上限时裁剪，保留最新的 maxHistory 条
@@ -406,13 +410,31 @@ func (m *MemoryManager) AppendMessage(_ context.Context, sessionID string, msg m
now := time.Now()
entry.lastActive = now
entry.session.UpdatedAt = now
// 复制标题（释放锁后安全使用）
persistTitle := entry.session.Title
m.mu.Unlock()
// Write-Through：异步写冷存储，不阻塞调用方
// Write-Through：消息同步写入 PostgreSQL（保证调用顺序 = 插入顺序，
// 避免用户消息和 AI 消息的异步 goroutine 执行顺序不确定导致排序错乱）
if m.msgRepo != nil {
if err := m.msgRepo.SaveMessage(context.Background(), sessionID, msg, 0); err != nil {
logger.Log.Warnw("persist message failed", "session", sessionID, "error", err)
}
}
// Write-Through：异步更新会话元数据（标题 + updated_at）到 PostgreSQL
if m.sessRepo != nil {
go func() {
if err := m.msgRepo.SaveMessage(context.Background(), sessionID, msg, 0); err != nil {
logger.Log.Warnw("persist message failed", "session", sessionID, "error", err)
if titleUpdated {
if err := m.sessRepo.UpdateTitle(context.Background(), sessionID, persistTitle); err != nil {
logger.Log.Warnw("persist session title failed", "session", sessionID, "error", err)
}
} else {
// 即使标题没变，也要刷新 updated_at（保证列表排序正确）
if err := m.sessRepo.Touch(context.Background(), sessionID); err != nil {
logger.Log.Warnw("touch session in DB failed", "session", sessionID, "error", err)
}
}
}()
}
@@ -540,10 +562,10 @@ func (m *MemoryManager) Destroy(ctx context.Context, sessionID string) error {
delete(m.sessions, sessionID)
m.mu.Unlock()
// Write-Through：异步删除 PG
// Write-Through：异步删除 PG（使用 Background context）
if m.sessRepo != nil {
go func() {
if err := m.sessRepo.Delete(ctx, sessionID); err != nil {
if err := m.sessRepo.Delete(context.Background(), sessionID); err != nil {
logger.Log.Warnw("delete session from DB failed", "session", sessionID, "error", err)
}
}()