seaweedfs/weed/storage/volume_tier.go

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package storage
import (
"bytes"
"fmt"
"io/ioutil"
_ "github.com/chrislusf/seaweedfs/weed/storage/backend/s3_backend"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
"github.com/chrislusf/seaweedfs/weed/storage/backend"
"github.com/golang/protobuf/jsonpb"
)
func (v *Volume) GetVolumeTierInfo() *volume_server_pb.VolumeTierInfo {
return v.volumeTierInfo
}
func (v *Volume) maybeLoadVolumeTierInfo() bool {
v.volumeTierInfo = &volume_server_pb.VolumeTierInfo{}
tierFileName := v.FileName() + ".tier"
if exists, canRead, _, _, _ := checkFile(tierFileName); !exists || !canRead {
if !exists {
return false
}
if !canRead {
glog.Warningf("can not read %s", tierFileName)
}
return false
}
glog.V(0).Infof("maybeLoadVolumeTierInfo loading volume %d check file", v.Id)
tierData, readErr := ioutil.ReadFile(tierFileName)
if readErr != nil {
glog.Warningf("fail to read %s : %v", tierFileName, readErr)
return false
}
glog.V(0).Infof("maybeLoadVolumeTierInfo loading volume %d ReadFile", v.Id)
if err := jsonpb.Unmarshal(bytes.NewReader(tierData), v.volumeTierInfo); err != nil {
glog.Warningf("unmarshal error: %v", err)
return false
}
glog.V(0).Infof("maybeLoadVolumeTierInfo loading volume %d Unmarshal tierInfo %v", v.Id, v.volumeTierInfo)
if len(v.volumeTierInfo.GetFiles()) == 0 {
return false
}
glog.V(0).Infof("volume %d is tiered to %s as %s and read only", v.Id,
v.volumeTierInfo.Files[0].BackendName(), v.volumeTierInfo.Files[0].Key)
v.noWriteCanDelete = true
v.noWriteOrDelete = false
glog.V(0).Infof("loading volume %d from remote %v", v.Id, v.volumeTierInfo.Files)
v.LoadRemoteFile()
return true
}
func (v *Volume) LoadRemoteFile() error {
tierFile := v.volumeTierInfo.GetFiles()[0]
backendStorage := backend.BackendStorages[tierFile.BackendName()]
if v.DataBackend != nil {
v.DataBackend.Close()
}
v.DataBackend = backendStorage.NewStorageFile(tierFile.Key, v.volumeTierInfo)
return nil
}
func (v *Volume) SaveVolumeTierInfo() error {
tierFileName := v.FileName() + ".tier"
if exists, _, canWrite, _, _ := checkFile(tierFileName); exists && !canWrite {
return fmt.Errorf("%s not writable", tierFileName)
}
m := jsonpb.Marshaler{
EmitDefaults: true,
Indent: " ",
}
text, marshalErr := m.MarshalToString(v.GetVolumeTierInfo())
if marshalErr != nil {
return fmt.Errorf("marshal volume %d tier info: %v", v.Id, marshalErr)
}
writeErr := ioutil.WriteFile(tierFileName, []byte(text), 0755)
if writeErr != nil {
return fmt.Errorf("fail to write %s : %v", tierFileName, writeErr)
}
return nil
}