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Copy pathfs-v1-metadata.go
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163 lines (145 loc) · 4.31 KB
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/*
* Minio Cloud Storage, (C) 2016 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 (
"encoding/json"
"sort"
)
const (
fsMetaJSONFile = "fs.json"
fsFormatJSONFile = "format.json"
)
// A fsMetaV1 represents a metadata header mapping keys to sets of values.
type fsMetaV1 struct {
Version string `json:"version"`
Format string `json:"format"`
Minio struct {
Release string `json:"release"`
} `json:"minio"`
// Metadata map for current object `fs.json`.
Meta map[string]string `json:"meta,omitempty"`
Parts []objectPartInfo `json:"parts,omitempty"`
}
// ObjectPartIndex - returns the index of matching object part number.
func (m fsMetaV1) ObjectPartIndex(partNumber int) (partIndex int) {
for i, part := range m.Parts {
if partNumber == part.Number {
partIndex = i
return partIndex
}
}
return -1
}
// AddObjectPart - add a new object part in order.
func (m *fsMetaV1) AddObjectPart(partNumber int, partName string, partETag string, partSize int64) {
partInfo := objectPartInfo{
Number: partNumber,
Name: partName,
ETag: partETag,
Size: partSize,
}
// Update part info if it already exists.
for i, part := range m.Parts {
if partNumber == part.Number {
m.Parts[i] = partInfo
return
}
}
// Proceed to include new part info.
m.Parts = append(m.Parts, partInfo)
// Parts in fsMeta should be in sorted order by part number.
sort.Sort(byObjectPartNumber(m.Parts))
}
// readFSMetadata - returns the object metadata `fs.json` content.
func readFSMetadata(disk StorageAPI, bucket, filePath string) (fsMeta fsMetaV1, err error) {
// Read all `fs.json`.
buf, err := disk.ReadAll(bucket, filePath)
if err != nil {
return fsMetaV1{}, traceError(err)
}
// Decode `fs.json` into fsMeta structure.
if err = json.Unmarshal(buf, &fsMeta); err != nil {
return fsMetaV1{}, traceError(err)
}
// Success.
return fsMeta, nil
}
// Write fsMeta to fs.json or fs-append.json.
func writeFSMetadata(disk StorageAPI, bucket, filePath string, fsMeta fsMetaV1) error {
tmpPath := mustGetUUID()
metadataBytes, err := json.Marshal(fsMeta)
if err != nil {
return traceError(err)
}
if err = disk.AppendFile(minioMetaTmpBucket, tmpPath, metadataBytes); err != nil {
return traceError(err)
}
err = disk.RenameFile(minioMetaTmpBucket, tmpPath, bucket, filePath)
if err != nil {
err = disk.DeleteFile(minioMetaTmpBucket, tmpPath)
if err != nil {
return traceError(err)
}
}
return nil
}
// newFSMetaV1 - initializes new fsMetaV1.
func newFSMetaV1() (fsMeta fsMetaV1) {
fsMeta = fsMetaV1{}
fsMeta.Version = "1.0.0"
fsMeta.Format = "fs"
fsMeta.Minio.Release = ReleaseTag
return fsMeta
}
// newFSFormatV1 - initializes new formatConfigV1 with FS format info.
func newFSFormatV1() (format *formatConfigV1) {
return &formatConfigV1{
Version: "1",
Format: "fs",
FS: &fsFormat{
Version: "1",
},
}
}
// isFSFormat - returns whether given formatConfigV1 is FS type or not.
func isFSFormat(format *formatConfigV1) bool {
return format.Format == "fs"
}
// writes FS format (format.json) into minioMetaBucket.
func saveFSFormatData(storage StorageAPI, fsFormat *formatConfigV1) error {
metadataBytes, err := json.Marshal(fsFormat)
if err != nil {
return err
}
// fsFormatJSONFile - format.json file stored in minioMetaBucket(.minio) directory.
if err = storage.AppendFile(minioMetaBucket, fsFormatJSONFile, metadataBytes); err != nil {
return err
}
return nil
}
// Return if the part info in uploadedParts and completeParts are same.
func isPartsSame(uploadedParts []objectPartInfo, completeParts []completePart) bool {
if len(uploadedParts) != len(completeParts) {
return false
}
for i := range completeParts {
if uploadedParts[i].Number != completeParts[i].PartNumber ||
uploadedParts[i].ETag != completeParts[i].ETag {
return false
}
}
return true
}