初始化2

bj_power_mes/internal/logic/logic.go

@@ -0,0 +1,56 @@
+package logic
+
+import (
+	"context"
+	"encoding/json"
+	"time"
+
+	"bj_power_mes/internal/svc"
+)
+
+// Service 业务逻辑服务（handler 薄层调用）
+type Service struct {
+	ctx *svc.ServiceContext
+}
+
+func New(s *svc.ServiceContext) *Service {
+	return &Service{ctx: s}
+}
+
+// cached 看板缓存：TTL + 防击穿（SETNX 锁），同一 key 同时仅一个打到 DB
+func (s *Service) cached(ctx context.Context, key string, ttl int, build func() (any, error)) (any, error) {
+	if s.ctx.RedisClient == nil {
+		return build()
+	}
+	if v, err := s.ctx.RedisClient.Get(key); err == nil && v != "" {
+		var out any
+		if json.Unmarshal([]byte(v), &out) == nil {
+			return out, nil
+		}
+	}
+
+	lockKey := key + ":lock"
+	ok, _ := s.ctx.RedisClient.SetnxEx(lockKey, "1", 10)
+	if !ok {
+		// 有人正在重建缓存：短暂等待后重读
+		for i := 0; i < 10; i++ {
+			time.Sleep(100 * time.Millisecond)
+			if v, err := s.ctx.RedisClient.Get(key); err == nil && v != "" {
+				var out any
+				if json.Unmarshal([]byte(v), &out) == nil {
+					return out, nil
+				}
+			}
+		}
+		return build()
+	}
+	defer func() { _, _ = s.ctx.RedisClient.Del(lockKey) }()
+
+	data, err := build()
+	if err == nil {
+		if b, e := json.Marshal(data); e == nil {
+			_ = s.ctx.RedisClient.Setex(key, string(b), ttl)
+		}
+	}
+	return data, err
+}