package pb import ( "bytes" "fmt" "io/ioutil" _ "github.com/chrislusf/seaweedfs/weed/storage/backend/s3_backend" "github.com/chrislusf/seaweedfs/weed/util" "github.com/golang/protobuf/jsonpb" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb" ) // MaybeLoadVolumeInfo load the file data as *volume_server_pb.VolumeInfo, the returned volumeInfo will not be nil func MaybeLoadVolumeInfo(fileName string) (*volume_server_pb.VolumeInfo, bool) { volumeInfo := &volume_server_pb.VolumeInfo{} glog.V(1).Infof("maybeLoadVolumeInfo checks %s", fileName) if exists, canRead, _, _, _ := util.CheckFile(fileName); !exists || !canRead { if !exists { return volumeInfo, false } if !canRead { glog.Warningf("can not read %s", fileName) } return volumeInfo, false } glog.V(1).Infof("maybeLoadVolumeInfo reads %s", fileName) tierData, readErr := ioutil.ReadFile(fileName) if readErr != nil { glog.Warningf("fail to read %s : %v", fileName, readErr) return volumeInfo, false } glog.V(1).Infof("maybeLoadVolumeInfo Unmarshal volume info %v", fileName) if err := jsonpb.Unmarshal(bytes.NewReader(tierData), volumeInfo); err != nil { glog.Warningf("unmarshal error: %v", err) return volumeInfo, false } if len(volumeInfo.GetFiles()) == 0 { return volumeInfo, false } return volumeInfo, true } func SaveVolumeInfo(fileName string, volumeInfo *volume_server_pb.VolumeInfo) error { if exists, _, canWrite, _, _ := util.CheckFile(fileName); exists && !canWrite { return fmt.Errorf("%s not writable", fileName) } m := jsonpb.Marshaler{ EmitDefaults: true, Indent: " ", } text, marshalErr := m.MarshalToString(volumeInfo) if marshalErr != nil { return fmt.Errorf("marshal to %s: %v", fileName, marshalErr) } writeErr := ioutil.WriteFile(fileName, []byte(text), 0755) if writeErr != nil { return fmt.Errorf("fail to write %s : %v", fileName, writeErr) } return nil }