mirror of
https://github.com/chrislusf/seaweedfs
synced 2024-08-24 02:31:11 +02:00
153 lines
3.3 KiB
Go
153 lines
3.3 KiB
Go
package wdclient
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import (
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"errors"
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"fmt"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"github.com/chrislusf/seaweedfs/weed/glog"
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)
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const (
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maxCursorIndex = 4096
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)
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type HasLookupFileIdFunction interface {
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GetLookupFileIdFunction() LookupFileIdFunctionType
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}
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type LookupFileIdFunctionType func(fileId string) (targetUrls []string, err error)
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type Location struct {
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Url string `json:"url,omitempty"`
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PublicUrl string `json:"publicUrl,omitempty"`
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DataCenter string `json:"dataCenter,omitempty"`
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}
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type vidMap struct {
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sync.RWMutex
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vid2Locations map[uint32][]Location
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DataCenter string
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cursor int32
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}
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func newVidMap(dataCenter string) vidMap {
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return vidMap{
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vid2Locations: make(map[uint32][]Location),
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DataCenter: dataCenter,
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cursor: -1,
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}
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}
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func (vc *vidMap) getLocationIndex(length int) (int, error) {
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if length <= 0 {
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return 0, fmt.Errorf("invalid length: %d", length)
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}
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if atomic.LoadInt32(&vc.cursor) == maxCursorIndex {
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atomic.CompareAndSwapInt32(&vc.cursor, maxCursorIndex, -1)
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}
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return int(atomic.AddInt32(&vc.cursor, 1)) % length, nil
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}
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func (vc *vidMap) LookupVolumeServerUrl(vid string) (serverUrls []string, err error) {
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id, err := strconv.Atoi(vid)
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if err != nil {
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glog.V(1).Infof("Unknown volume id %s", vid)
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return nil, err
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}
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locations, found := vc.GetLocations(uint32(id))
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if !found {
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return nil, fmt.Errorf("volume %d not found", id)
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}
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for _, loc := range locations {
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if vc.DataCenter == "" || loc.DataCenter == "" || vc.DataCenter != loc.DataCenter {
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serverUrls = append(serverUrls, loc.Url)
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} else {
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serverUrls = append([]string{loc.Url}, serverUrls...)
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}
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}
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return
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}
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func (vc *vidMap) GetLookupFileIdFunction() LookupFileIdFunctionType {
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return vc.LookupFileId
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}
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func (vc *vidMap) LookupFileId(fileId string) (fullUrls []string, err error) {
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parts := strings.Split(fileId, ",")
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if len(parts) != 2 {
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return nil, errors.New("Invalid fileId " + fileId)
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}
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serverUrls, lookupError := vc.LookupVolumeServerUrl(parts[0])
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if lookupError != nil {
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return nil, lookupError
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}
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for _, serverUrl := range serverUrls {
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fullUrls = append(fullUrls, "http://"+serverUrl+"/"+fileId)
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}
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return
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}
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func (vc *vidMap) GetVidLocations(vid string) (locations []Location, err error) {
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id, err := strconv.Atoi(vid)
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if err != nil {
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glog.V(1).Infof("Unknown volume id %s", vid)
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return nil, fmt.Errorf("Unknown volume id %s", vid)
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}
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foundLocations, found := vc.GetLocations(uint32(id))
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if found {
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return foundLocations, nil
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}
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return nil, fmt.Errorf("volume id %s not found", vid)
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}
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func (vc *vidMap) GetLocations(vid uint32) (locations []Location, found bool) {
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vc.RLock()
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defer vc.RUnlock()
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locations, found = vc.vid2Locations[vid]
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return
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}
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func (vc *vidMap) addLocation(vid uint32, location Location) {
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vc.Lock()
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defer vc.Unlock()
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locations, found := vc.vid2Locations[vid]
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if !found {
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vc.vid2Locations[vid] = []Location{location}
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return
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}
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for _, loc := range locations {
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if loc.Url == location.Url {
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return
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}
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}
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vc.vid2Locations[vid] = append(locations, location)
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}
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func (vc *vidMap) deleteLocation(vid uint32, location Location) {
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vc.Lock()
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defer vc.Unlock()
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locations, found := vc.vid2Locations[vid]
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if !found {
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return
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}
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for i, loc := range locations {
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if loc.Url == location.Url {
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vc.vid2Locations[vid] = append(locations[0:i], locations[i+1:]...)
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break
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}
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}
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}
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