seaweedfs/weed/storage/volume_info/volume_info.go

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2021-08-26 22:18:34 +00:00
package volume_info
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) (volumeInfo *volume_server_pb.VolumeInfo, hasRemoteFile bool, hasVolumeInfoFile bool, err error) {
volumeInfo = &volume_server_pb.VolumeInfo{}
glog.V(1).Infof("maybeLoadVolumeInfo checks %s", fileName)
if exists, canRead, _, _, _ := util.CheckFile(fileName); !exists || !canRead {
if !exists {
return
}
hasVolumeInfoFile = true
if !canRead {
glog.Warningf("can not read %s", fileName)
err = fmt.Errorf("can not read %s", fileName)
return
}
return
}
hasVolumeInfoFile = true
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)
err = fmt.Errorf("fail to read %s : %v", fileName, readErr)
return
}
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)
err = fmt.Errorf("unmarshal error: %v", err)
return
}
if len(volumeInfo.GetFiles()) == 0 {
return
}
hasRemoteFile = true
return
}
func SaveVolumeInfo(fileName string, volumeInfo *volume_server_pb.VolumeInfo) error {
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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)
}
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writeErr := ioutil.WriteFile(fileName, []byte(text), 0755)
if writeErr != nil {
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return fmt.Errorf("fail to write %s : %v", fileName, writeErr)
}
return nil
}