open-im-server/pkg/common/db/cache/rockscache.go

package cache

import (
	"Open_IM/pkg/utils"
	"context"
	"encoding/json"
	"github.com/dtm-labs/rockscache"
	"time"
)

const scanCount = 3000


func (rc *RcClient) DelKeys() {
	for _, key := range []string{"GROUP_CACHE:", "FRIEND_RELATION_CACHE", "BLACK_LIST_CACHE:", "USER_INFO_CACHE:", "GROUP_INFO_CACHE", groupOwnerIDCache, joinedGroupListCache,
		groupMemberInfoCache, groupAllMemberInfoCache, "ALL_FRIEND_INFO_CACHE:"} {
		fName := utils.GetSelfFuncName()
		var cursor uint64
		var n int
		for {
			var keys []string
			var err error
			keys, cursor, err = rc.rdb.Scan(context.Background(), cursor, key+"*", scanCount).Result()
			if err != nil {
				panic(err.Error())
			}
			n += len(keys)
			// for each for redis cluster
			for _, key := range keys {
				if err = rc.rdb.Del(context.Background(), key).Err(); err != nil {
					log.NewError("", fName, key, err.Error())
					err = rc.rdb.Del(context.Background(), key).Err()
					if err != nil {
						panic(err.Error())
					}
				}
			}
			if cursor == 0 {
				break
			}
		}
	}
}


func GetCache[T any](ctx context.Context, rcClient *rockscache.Client, key string, expire time.Duration, fn func(ctx context.Context) (T, error)) (T, error) {
	var t T
	var write bool
	v, err := rcClient.Fetch(key, expire, func() (s string, err error) {
		t, err = fn(ctx)
		if err != nil {
			return "", err
		}
		bs, err := json.Marshal(t)
		if err != nil {
			return "", utils.Wrap(err, "")
		}
		write = true
		return string(bs), nil
	})
	if err != nil {
		return t, err
	}
	if write {
		return t, nil
	}
	err = json.Unmarshal([]byte(v), &t)
	if err != nil {
		return t, utils.Wrap(err, "")
	}
	return t, nil
}

func GetCacheFor[E any, T any](ctx context.Context, list []E, fn func(ctx context.Context, item E) (T, error)) ([]T, error) {
	rs := make([]T, 0, len(list))
	for _, e := range list {
		r, err := fn(ctx, e)
		if err != nil {
			return nil, err
		}
		rs = append(rs, r)
	}
	return rs, nil
}