seaweedfs/weed/operation/lookup_vid_cache.go

60 lines
1.2 KiB
Go

package operation
import (
"errors"
"strconv"
"sync"
"time"
"github.com/seaweedfs/seaweedfs/weed/glog"
)
var ErrorNotFound = errors.New("not found")
type VidInfo struct {
Locations []Location
NextRefreshTime time.Time
}
type VidCache struct {
sync.RWMutex
cache []VidInfo
}
func (vc *VidCache) Get(vid string) ([]Location, error) {
id, err := strconv.Atoi(vid)
if err != nil {
glog.V(1).Infof("Unknown volume id %s", vid)
return nil, err
}
vc.RLock()
defer vc.RUnlock()
if 0 < id && id <= len(vc.cache) {
if vc.cache[id-1].Locations == nil {
return nil, errors.New("not set")
}
if vc.cache[id-1].NextRefreshTime.Before(time.Now()) {
return nil, errors.New("expired")
}
return vc.cache[id-1].Locations, nil
}
return nil, ErrorNotFound
}
func (vc *VidCache) Set(vid string, locations []Location, duration time.Duration) {
id, err := strconv.Atoi(vid)
if err != nil {
glog.V(1).Infof("Unknown volume id %s", vid)
return
}
vc.Lock()
defer vc.Unlock()
if id > len(vc.cache) {
for i := id - len(vc.cache); i > 0; i-- {
vc.cache = append(vc.cache, VidInfo{})
}
}
if id > 0 {
vc.cache[id-1].Locations = locations
vc.cache[id-1].NextRefreshTime = time.Now().Add(duration)
}
}