Sub2API v1.0 - AI API 网关（二开初始版本，基于上游 Wei-Shaw/sub2api）

backend/internal/service/proxy_expiry_service.go

@@ -0,0 +1,63 @@
+package service
+
+import (
+	"context"
+	"log"
+	"sync"
+	"time"
+)
+
+// ProxyExpiryService 周期扫描到期代理并把绑定账号改投备用/直连。
+type ProxyExpiryService struct {
+	proxyRepo ProxyRepository
+	interval  time.Duration
+	stopCh    chan struct{}
+	stopOnce  sync.Once
+	wg        sync.WaitGroup
+}
+
+func NewProxyExpiryService(proxyRepo ProxyRepository, interval time.Duration) *ProxyExpiryService {
+	return &ProxyExpiryService{proxyRepo: proxyRepo, interval: interval, stopCh: make(chan struct{})}
+}
+
+func (s *ProxyExpiryService) Start() {
+	if s == nil || s.proxyRepo == nil || s.interval <= 0 {
+		return
+	}
+	s.wg.Add(1)
+	go func() {
+		defer s.wg.Done()
+		ticker := time.NewTicker(s.interval)
+		defer ticker.Stop()
+		s.runOnce()
+		for {
+			select {
+			case <-ticker.C:
+				s.runOnce()
+			case <-s.stopCh:
+				return
+			}
+		}
+	}()
+}
+
+func (s *ProxyExpiryService) Stop() {
+	if s == nil {
+		return
+	}
+	s.stopOnce.Do(func() { close(s.stopCh) })
+	s.wg.Wait()
+}
+
+func (s *ProxyExpiryService) runOnce() {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	changed, err := s.proxyRepo.SweepExpiredProxies(ctx, time.Now())
+	if err != nil {
+		log.Printf("[ProxyExpiry] sweep expired proxies failed: %v", err)
+		return
+	}
+	if changed > 0 {
+		log.Printf("[ProxyExpiry] re-routed %d accounts off expired proxies", changed)
+	}
+}