You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: cache.go
    path of file: ./repos/erda/internal/tools/monitor/core/storekit/clickhouse/table/meta
    
    the code of the file until where you have to start completion: // Copyright (c) 2021 Terminus, Inc.
//
// Licensed un
    
func (p *provider) getCache() ([]MetricMeta, error) {
	var caches []MetricMeta

	val, err := p.Redis.Get(p.Cfg.CacheKeyPrefix).Result()
	if err != nil && err != redis.Nil {
		return nil, err
	}
	if len(val) == 0 {
		return nil, nil
	}
	err = json.UnmarshalFromString(val, &caches)
	if err != nil {
		p.Log.Warnf("corrupted table cached-data: \n%s\n", val)
		return nil, err
	}
	return caches, nil
}