type srIAMCache struct {
	sync.RWMutex
	lastUpdate time.Time
	srIAMInfo  madmin.SRInfo // caches IAM info
}

func (c *SiteReplicationSys) getSRCachedIAMInfo() (info madmin.SRInfo, ok bool) {
	c.iamMetaCache.RLock()
	defer c.iamMetaCache.RUnlock()
	if c.iamMetaCache.lastUpdate.IsZero() {
		return info, false
	}