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115 lines
2.5 KiB
115 lines
2.5 KiB
package storage
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import (
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"errors"
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"fmt"
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"net/url"
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"os"
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"path"
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"github.com/chrislusf/seaweedfs/go/util"
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)
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type ReplicaTask struct {
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VID VolumeId
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Collection string
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SrcDataNode string
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s *Store
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location *DiskLocation
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}
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func NewReplicaTask(s *Store, args url.Values) (*ReplicaTask, error) {
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volumeIdString := args.Get("volume")
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vid, err := NewVolumeId(volumeIdString)
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if err != nil {
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return nil, fmt.Errorf("Volume Id %s is not a valid unsigned integer", volumeIdString)
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}
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source := args.Get("source")
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if source == "" {
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return nil, errors.New("Invalid source data node.")
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}
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location := s.findFreeLocation()
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if location == nil {
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return nil, errors.New("No more free space left")
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}
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collection := args.Get("collection")
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return &ReplicaTask{
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VID: vid,
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Collection: collection,
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SrcDataNode: source,
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s: s,
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location: location,
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}, nil
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}
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func (t *ReplicaTask) Run() error {
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ch := make(chan error)
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go func() {
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idxUrl := util.MkUrl(t.SrcDataNode, "/admin/sync/index", url.Values{"volume": {t.VID.String()}})
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e := util.DownloadToFile(idxUrl, t.FileName()+".repx")
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if e != nil {
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e = fmt.Errorf("Replicat error: %s, %v", idxUrl, e)
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}
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ch <- e
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}()
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go func() {
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datUrl := util.MkUrl(t.SrcDataNode, "/admin/sync/vol_data", url.Values{"volume": {t.VID.String()}})
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e := util.DownloadToFile(datUrl, t.FileName()+".repd")
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if e != nil {
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e = fmt.Errorf("Replicat error: %s, %v", datUrl, e)
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}
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ch <- e
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}()
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errs := make([]error, 0)
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for i := 0; i < 2; i++ {
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if e := <-ch; e != nil {
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errs = append(errs, e)
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}
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}
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if len(errs) == 0 {
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return nil
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} else {
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return fmt.Errorf("%v", errs)
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}
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}
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func (t *ReplicaTask) Commit() error {
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var (
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volume *Volume
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e error
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)
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if e = os.Rename(t.FileName()+".repd", t.FileName()+".dat"); e != nil {
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return e
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}
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if e = os.Rename(t.FileName()+".repx", t.FileName()+".idx"); e != nil {
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return e
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}
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volume, e = NewVolume(t.location.Directory, t.Collection, t.VID, t.s.needleMapKind, nil)
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if e == nil {
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t.location.AddVolume(t.VID, volume)
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t.s.SendHeartbeatToMaster(nil)
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}
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return e
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}
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func (t *ReplicaTask) Clean() error {
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os.Remove(t.FileName() + ".repx")
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os.Remove(t.FileName() + ".repd")
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return nil
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}
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func (t *ReplicaTask) Info() url.Values {
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//TODO
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return url.Values{}
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}
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func (t *ReplicaTask) FileName() (fileName string) {
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if t.Collection == "" {
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fileName = path.Join(t.location.Directory, t.VID.String())
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} else {
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fileName = path.Join(t.location.Directory, t.Collection+"_"+t.VID.String())
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}
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return
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}
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