初始提交：姜十三论坛 Jiang13 Forum

轻量自用论坛，Go 单二进制 + React SPA 内嵌 + SQLite。 Co-authored-by: Cursor <cursoragent@cursor.com>
2026-06-15 21:08:52 +08:00
commit e1c1708715
140 changed files with 16115 additions and 0 deletions
--- a/service/online.go
+++ b/service/online.go
@@ -0,0 +1,133 @@
+package service
+
+import (
+	"sync"
+	"time"
+
+	"github.com/jiang13/forum/model"
+)
+
+const onlineTTL = 5 * time.Minute
+
+// OnlineService 在线浏览追踪（内存）：登录会员 + 游客
+type OnlineService struct {
+	mu     sync.RWMutex
+	seen   map[uint]time.Time   // 登录用户
+	guests map[string]time.Time // 游客访客标识
+}
+
+func NewOnlineService() *OnlineService {
+	s := &OnlineService{
+		seen:   make(map[uint]time.Time),
+		guests: make(map[string]time.Time),
+	}
+	go s.cleanup()
+	return s
+}
+
+func (s *OnlineService) Ping(userID uint) {
+	if userID == 0 {
+		return
+	}
+	s.mu.Lock()
+	s.seen[userID] = time.Now()
+	s.mu.Unlock()
+}
+
+func (s *OnlineService) PingGuest(visitorID string) {
+	if visitorID == "" {
+		return
+	}
+	s.mu.Lock()
+	s.guests[visitorID] = time.Now()
+	s.mu.Unlock()
+}
+
+type OnlineUser struct {
+	ID       uint   `json:"id"`
+	Nickname string `json:"nickname"`
+	Avatar   string `json:"avatar"`
+}
+
+func (s *OnlineService) List(limit int) []OnlineUser {
+	if limit <= 0 {
+		limit = 20
+	}
+	cutoff := time.Now().Add(-onlineTTL)
+	s.mu.RLock()
+	var ids []uint
+	for id, t := range s.seen {
+		if t.After(cutoff) {
+			ids = append(ids, id)
+		}
+	}
+	s.mu.RUnlock()
+	if len(ids) == 0 {
+		return nil
+	}
+	var users []model.User
+	model.DB.Where("id IN ?", ids).Limit(limit).Find(&users)
+	out := make([]OnlineUser, 0, len(users))
+	for _, u := range users {
+		out = append(out, OnlineUser{ID: u.ID, Nickname: u.Nickname, Avatar: u.Avatar})
+	}
+	return out
+}
+
+func (s *OnlineService) CountMembers() int {
+	return s.countSeen(s.seen)
+}
+
+func (s *OnlineService) CountGuests() int {
+	return s.countSeenString(s.guests)
+}
+
+// Count 当前浏览总人数（会员 + 游客）
+func (s *OnlineService) Count() int {
+	return s.CountMembers() + s.CountGuests()
+}
+
+func (s *OnlineService) countSeen(m map[uint]time.Time) int {
+	cutoff := time.Now().Add(-onlineTTL)
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	n := 0
+	for _, t := range m {
+		if t.After(cutoff) {
+			n++
+		}
+	}
+	return n
+}
+
+func (s *OnlineService) countSeenString(m map[string]time.Time) int {
+	cutoff := time.Now().Add(-onlineTTL)
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	n := 0
+	for _, t := range m {
+		if t.After(cutoff) {
+			n++
+		}
+	}
+	return n
+}
+
+func (s *OnlineService) cleanup() {
+	ticker := time.NewTicker(time.Minute)
+	for range ticker.C {
+		cutoff := time.Now().Add(-onlineTTL * 2)
+		s.mu.Lock()
+		for id, t := range s.seen {
+			if t.Before(cutoff) {
+				delete(s.seen, id)
+			}
+		}
+		for id, t := range s.guests {
+			if t.Before(cutoff) {
+				delete(s.guests, id)
+			}
+		}
+		s.mu.Unlock()
+	}
+}