package source import ( "context" "fmt" "io" "net/http" "strings" "google.golang.org/grpc" "github.com/chrislusf/seaweedfs/weed/pb" "github.com/chrislusf/seaweedfs/weed/security" "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 grpcDialOption grpc.DialOption Dir string } func (fs *FilerSource) Initialize(configuration util.Configuration, prefix string) error { return fs.DoInitialize( configuration.GetString(prefix+"grpcAddress"), configuration.GetString(prefix+"directory"), ) } func (fs *FilerSource) DoInitialize(grpcAddress string, dir string) (err error) { fs.grpcAddress = grpcAddress fs.Dir = dir fs.grpcDialOption = security.LoadClientTLS(util.GetViper(), "grpc.client") return nil } func (fs *FilerSource) LookupFileId(part string) (fileUrls []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 nil, 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 nil, fmt.Errorf("LookupFileId locate volume id %s: %v", vid, err) } for _, loc := range locations.Locations { fileUrls = append(fileUrls, fmt.Sprintf("http://%s/%s", loc.Url, part)) } return } func (fs *FilerSource) ReadPart(part string) (filename string, header http.Header, resp *http.Response, err error) { fileUrls, err := fs.LookupFileId(part) if err != nil { return "", nil, nil, err } for _, fileUrl := range fileUrls { filename, header, resp, err = util.DownloadFile(fileUrl) if err != nil { glog.V(1).Infof("fail to read from %s: %v", fileUrl, err) } else { break } } return filename, header, resp, err } var _ = filer_pb.FilerClient(&FilerSource{}) func (fs *FilerSource) WithFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error { return pb.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error { client := filer_pb.NewSeaweedFilerClient(grpcConnection) return fn(client) }, fs.grpcAddress, fs.grpcDialOption) } func (fs *FilerSource) AdjustedUrl(location *filer_pb.Location) string { return location.Url } func volumeId(fileId string) string { lastCommaIndex := strings.LastIndex(fileId, ",") if lastCommaIndex > 0 { return fileId[:lastCommaIndex] } return fileId }