package model

import (
	"app.yhyue.com/moapp/jybase/redis"
	"fmt"
	"github.com/gogf/gf/v2/container/gvar"
	"github.com/gogf/gf/v2/errors/gerror"
	"strings"
	"sync"
	"time"
)

// GetL2CacheData 二级缓存
// 注意 lock定义为全局锁
func GetL2CacheData(dbName string, lock *sync.RWMutex, key string, f func() interface{}, cacheSec int) *gvar.Var {
	var (
		data    = gvar.New(redis.Get(dbName, key))
		newData *gvar.Var
	)
	if data.IsEmpty() {
		data = gvar.New(redis.Get(dbName, fmt.Sprintf("%s_L2Cache", key)))
		go func() {
			if lock.TryLock() {
				defer lock.Unlock()
				if n := f(); n != nil {
					newData = gvar.New(n)
					go func() {
						redis.Put(dbName, key, newData, cacheSec)
						redis.Put(dbName, fmt.Sprintf("%s_L2Cache", key), newData, -1)
					}()
				}
			}
		}()
		if data.IsEmpty() {
			time.Sleep(100 * time.Millisecond)
			if newData.IsEmpty() {
				data = newData
			}
		}
	}
	return data
}

// ClearL2Cache 清除缓存
func ClearL2Cache(dbName, key string) (err error) {
	var errCacheKey []string
	for i := 1; i <= 2; i++ {
		fKey := key
		if i != 1 {
			fKey = fmt.Sprintf("%s_L2Cache", key)
		}
		if ok := redis.Del(dbName, fKey); !ok {
			errCacheKey = append(errCacheKey, fKey)
		}
	}
	if len(errCacheKey) == 0 {
		return nil
	}
	return gerror.Newf("清除缓存失败%s", strings.Join(errCacheKey, ","))
}