mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-01-19 02:48:24 +00:00
95 lines
2.2 KiB
Go
95 lines
2.2 KiB
Go
package source
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import (
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"io"
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"github.com/chrislusf/seaweedfs/weed/util"
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
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"fmt"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"strings"
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"context"
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)
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type ReplicationSource interface {
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ReadPart(part string) io.ReadCloser
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}
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type FilerSource struct {
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grpcAddress string
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Dir string
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}
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func (fs *FilerSource) Initialize(configuration util.Configuration) error {
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return fs.initialize(
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configuration.GetString("grpcAddress"),
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configuration.GetString("directory"),
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)
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}
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func (fs *FilerSource) initialize(grpcAddress string, dir string) (err error) {
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fs.grpcAddress = grpcAddress
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fs.Dir = dir
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return nil
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}
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func (fs *FilerSource) ReadPart(part string) (readCloser io.ReadCloser, err error) {
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vid2Locations := make(map[string]*filer_pb.Locations)
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vid := volumeId(part)
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err = fs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
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glog.V(4).Infof("read lookup volume id locations: %v", vid)
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resp, err := client.LookupVolume(context.Background(), &filer_pb.LookupVolumeRequest{
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VolumeIds: []string{vid},
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})
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if err != nil {
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return err
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}
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vid2Locations = resp.LocationsMap
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return nil
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})
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if err != nil {
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glog.V(1).Infof("replication lookup volume id %s: %v", vid, err)
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return nil, fmt.Errorf("replication lookup volume id %s: %v", vid, err)
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}
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locations := vid2Locations[vid]
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if locations == nil || len(locations.Locations) == 0 {
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glog.V(1).Infof("replication locate volume id %s: %v", vid, err)
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return nil, fmt.Errorf("replication locate volume id %s: %v", vid, err)
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}
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fileUrl := fmt.Sprintf("http://%s/%s", locations.Locations[0].Url, part)
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_, readCloser, err = util.DownloadUrl(fileUrl)
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return readCloser, err
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}
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func (fs *FilerSource) withFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
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grpcConnection, err := util.GrpcDial(fs.grpcAddress)
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if err != nil {
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return fmt.Errorf("fail to dial %s: %v", fs.grpcAddress, err)
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}
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defer grpcConnection.Close()
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client := filer_pb.NewSeaweedFilerClient(grpcConnection)
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return fn(client)
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}
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func volumeId(fileId string) string {
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lastCommaIndex := strings.LastIndex(fileId, ",")
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if lastCommaIndex > 0 {
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return fileId[:lastCommaIndex]
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}
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return fileId
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}
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