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|
package wdclient
import (
"errors"
"fmt"
"strconv"
"strings"
"sync"
"sync/atomic"
"github.com/chrislusf/seaweedfs/weed/glog"
)
const (
maxCursorIndex = 4096
)
type Location struct {
Url string `json:"url,omitempty"`
PublicUrl string `json:"publicUrl,omitempty"`
DataCenter string `json:"dataCenter,omitempty"`
}
type vidMap struct {
sync.RWMutex
vid2Locations map[uint32][]Location
DataCenter string
cursor int32
}
func newVidMap(dataCenter string) vidMap {
return vidMap{
vid2Locations: make(map[uint32][]Location),
DataCenter: dataCenter,
cursor: -1,
}
}
func (vc *vidMap) getLocationIndex(length int) (int, error) {
if length <= 0 {
return 0, fmt.Errorf("invalid length: %d", length)
}
if atomic.LoadInt32(&vc.cursor) == maxCursorIndex {
atomic.CompareAndSwapInt32(&vc.cursor, maxCursorIndex, -1)
}
return int(atomic.AddInt32(&vc.cursor, 1)) % length, nil
}
func (vc *vidMap) LookupVolumeServerUrl(vid string) (serverUrls []string, err error) {
id, err := strconv.Atoi(vid)
if err != nil {
glog.V(1).Infof("Unknown volume id %s", vid)
return nil, err
}
locations, found := vc.GetLocations(uint32(id))
if !found {
return nil, fmt.Errorf("volume %d not found", id)
}
for _, loc := range locations {
if vc.DataCenter == "" || loc.DataCenter == "" || vc.DataCenter != loc.DataCenter {
serverUrls = append(serverUrls, loc.Url)
} else {
serverUrls = append([]string{loc.Url}, serverUrls...)
}
}
return
}
func (vc *vidMap) LookupFileId(fileId string) (fullUrls []string, err error) {
parts := strings.Split(fileId, ",")
if len(parts) != 2 {
return nil, errors.New("Invalid fileId " + fileId)
}
serverUrls, lookupError := vc.LookupVolumeServerUrl(parts[0])
if lookupError != nil {
return nil, lookupError
}
for _, serverUrl := range serverUrls {
fullUrls = append(fullUrls, "http://"+serverUrl+"/"+fileId)
}
return
}
func (vc *vidMap) GetVidLocations(vid string) (locations []Location, err error) {
id, err := strconv.Atoi(vid)
if err != nil {
glog.V(1).Infof("Unknown volume id %s", vid)
return nil, fmt.Errorf("Unknown volume id %s", vid)
}
foundLocations, found := vc.GetLocations(uint32(id))
if found {
return foundLocations, nil
}
return nil, fmt.Errorf("volume id %s not found", vid)
}
func (vc *vidMap) GetLocations(vid uint32) (locations []Location, found bool) {
vc.RLock()
defer vc.RUnlock()
locations, found = vc.vid2Locations[vid]
return
}
func (vc *vidMap) addLocation(vid uint32, location Location) {
vc.Lock()
defer vc.Unlock()
locations, found := vc.vid2Locations[vid]
if !found {
vc.vid2Locations[vid] = []Location{location}
return
}
for _, loc := range locations {
if loc.Url == location.Url {
return
}
}
vc.vid2Locations[vid] = append(locations, location)
}
func (vc *vidMap) deleteLocation(vid uint32, location Location) {
vc.Lock()
defer vc.Unlock()
locations, found := vc.vid2Locations[vid]
if !found {
return
}
for i, loc := range locations {
if loc.Url == location.Url {
vc.vid2Locations[vid] = append(locations[0:i], locations[i+1:]...)
break
}
}
}
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