minio/cmd/xl-storage-format-utils.go
2020-09-21 14:24:42 -07:00

97 lines
2.6 KiB
Go

/*
* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
jsoniter "github.com/json-iterator/go"
)
type versionsSorter []FileInfo
func (v versionsSorter) Len() int { return len(v) }
func (v versionsSorter) Swap(i, j int) { v[i], v[j] = v[j], v[i] }
func (v versionsSorter) Less(i, j int) bool {
if v[i].IsLatest {
return true
}
if v[j].IsLatest {
return false
}
return v[i].ModTime.After(v[j].ModTime)
}
func getFileInfoVersions(xlMetaBuf []byte, volume, path string) (FileInfoVersions, error) {
if isXL2V1Format(xlMetaBuf) {
var xlMeta xlMetaV2
if err := xlMeta.Load(xlMetaBuf); err != nil {
return FileInfoVersions{}, err
}
versions, latestModTime, err := xlMeta.ListVersions(volume, path)
if err != nil {
return FileInfoVersions{}, err
}
return FileInfoVersions{
Volume: volume,
Name: path,
Versions: versions,
LatestModTime: latestModTime,
}, nil
}
xlMeta := &xlMetaV1Object{}
var json = jsoniter.ConfigCompatibleWithStandardLibrary
if err := json.Unmarshal(xlMetaBuf, xlMeta); err != nil {
return FileInfoVersions{}, errFileCorrupt
}
fi, err := xlMeta.ToFileInfo(volume, path)
if err != nil {
return FileInfoVersions{}, err
}
fi.IsLatest = true // No versions so current version is latest.
fi.XLV1 = true // indicates older version
return FileInfoVersions{
Volume: volume,
Name: path,
Versions: []FileInfo{fi},
LatestModTime: fi.ModTime,
}, nil
}
func getFileInfo(xlMetaBuf []byte, volume, path, versionID string) (FileInfo, error) {
if isXL2V1Format(xlMetaBuf) {
var xlMeta xlMetaV2
if err := xlMeta.Load(xlMetaBuf); err != nil {
return FileInfo{}, err
}
return xlMeta.ToFileInfo(volume, path, versionID)
}
xlMeta := &xlMetaV1Object{}
var json = jsoniter.ConfigCompatibleWithStandardLibrary
if err := json.Unmarshal(xlMetaBuf, xlMeta); err != nil {
return FileInfo{}, errFileCorrupt
}
fi, err := xlMeta.ToFileInfo(volume, path)
if err == errFileNotFound && versionID != "" {
return fi, errFileVersionNotFound
}
fi.XLV1 = true // indicates older version
return fi, err
}