mirror of
https://github.com/chrislusf/seaweedfs
synced 2024-05-02 01:27:55 +02:00
77 lines
2.1 KiB
Go
77 lines
2.1 KiB
Go
package pb
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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_ "github.com/chrislusf/seaweedfs/weed/storage/backend/s3_backend"
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"github.com/chrislusf/seaweedfs/weed/util"
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"github.com/golang/protobuf/jsonpb"
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"github.com/chrislusf/seaweedfs/weed/util/log"
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"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
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)
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// MaybeLoadVolumeInfo load the file data as *volume_server_pb.VolumeInfo, the returned volumeInfo will not be nil
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func MaybeLoadVolumeInfo(fileName string) (*volume_server_pb.VolumeInfo, bool, error) {
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volumeInfo := &volume_server_pb.VolumeInfo{}
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log.Debugf("maybeLoadVolumeInfo checks %s", fileName)
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if exists, canRead, _, _, _ := util.CheckFile(fileName); !exists || !canRead {
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if !exists {
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return volumeInfo, false, nil
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}
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if !canRead {
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log.Warnf("can not read %s", fileName)
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return volumeInfo, false, fmt.Errorf("can not read %s", fileName)
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}
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return volumeInfo, false, nil
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}
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log.Debugf("maybeLoadVolumeInfo reads %s", fileName)
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tierData, readErr := ioutil.ReadFile(fileName)
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if readErr != nil {
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log.Warnf("fail to read %s : %v", fileName, readErr)
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return volumeInfo, false, fmt.Errorf("fail to read %s : %v", fileName, readErr)
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}
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log.Debugf("maybeLoadVolumeInfo Unmarshal volume info %v", fileName)
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if err := jsonpb.Unmarshal(bytes.NewReader(tierData), volumeInfo); err != nil {
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log.Warnf("unmarshal error: %v", err)
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return volumeInfo, false, fmt.Errorf("unmarshal error: %v", err)
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}
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if len(volumeInfo.GetFiles()) == 0 {
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return volumeInfo, false, nil
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}
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return volumeInfo, true, nil
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}
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func SaveVolumeInfo(fileName string, volumeInfo *volume_server_pb.VolumeInfo) error {
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if exists, _, canWrite, _, _ := util.CheckFile(fileName); exists && !canWrite {
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return fmt.Errorf("%s not writable", fileName)
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}
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m := jsonpb.Marshaler{
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EmitDefaults: true,
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Indent: " ",
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}
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text, marshalErr := m.MarshalToString(volumeInfo)
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if marshalErr != nil {
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return fmt.Errorf("marshal to %s: %v", fileName, marshalErr)
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}
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writeErr := ioutil.WriteFile(fileName, []byte(text), 0755)
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if writeErr != nil {
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return fmt.Errorf("fail to write %s : %v", fileName, writeErr)
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}
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return nil
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}
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