package source import ( "context" "fmt" "io" "net/http" "strings" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/filer_pb" "github.com/chrislusf/seaweedfs/weed/util" ) type ReplicationSource interface { ReadPart(part string) io.ReadCloser } type FilerSource struct { grpcAddress string Dir string } func (fs *FilerSource) Initialize(configuration util.Configuration) error { return fs.initialize( configuration.GetString("grpcAddress"), configuration.GetString("directory"), ) } func (fs *FilerSource) initialize(grpcAddress string, dir string) (err error) { fs.grpcAddress = grpcAddress fs.Dir = dir return nil } func (fs *FilerSource) LookupFileId(part string) (fileUrl string, err error) { vid2Locations := make(map[string]*filer_pb.Locations) vid := volumeId(part) err = fs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error { glog.V(4).Infof("read lookup volume id locations: %v", vid) resp, err := client.LookupVolume(context.Background(), &filer_pb.LookupVolumeRequest{ VolumeIds: []string{vid}, }) if err != nil { return err } vid2Locations = resp.LocationsMap return nil }) if err != nil { glog.V(1).Infof("LookupFileId volume id %s: %v", vid, err) return "", fmt.Errorf("LookupFileId volume id %s: %v", vid, err) } locations := vid2Locations[vid] if locations == nil || len(locations.Locations) == 0 { glog.V(1).Infof("LookupFileId locate volume id %s: %v", vid, err) return "", fmt.Errorf("LookupFileId locate volume id %s: %v", vid, err) } fileUrl = fmt.Sprintf("http://%s/%s", locations.Locations[0].Url, part) return } func (fs *FilerSource) ReadPart(part string) (filename string, header http.Header, readCloser io.ReadCloser, err error) { fileUrl, err := fs.LookupFileId(part) if err != nil { return "", nil, nil, err } filename, header, readCloser, err = util.DownloadFile(fileUrl) return filename, header, readCloser, err } func (fs *FilerSource) withFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error { grpcConnection, err := util.GrpcDial(fs.grpcAddress) if err != nil { return fmt.Errorf("fail to dial %s: %v", fs.grpcAddress, err) } defer grpcConnection.Close() client := filer_pb.NewSeaweedFilerClient(grpcConnection) return fn(client) } func volumeId(fileId string) string { lastCommaIndex := strings.LastIndex(fileId, ",") if lastCommaIndex > 0 { return fileId[:lastCommaIndex] } return fileId }