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minio/cmd/fs-v1-metadata.go

207 lines
5.2 KiB

/*
* Minio Cloud Storage, (C) 2016, 2017, 2017 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 (
"io"
"io/ioutil"
"os"
pathutil "path"
"strings"
"github.com/minio/minio/pkg/errors"
"github.com/minio/minio/pkg/lock"
"github.com/minio/minio/pkg/mimedb"
"github.com/tidwall/gjson"
)
// FS format, and object metadata.
const (
// fs.json object metadata.
fsMetaJSONFile = "fs.json"
)
// FS metadata constants.
const (
// FS backend meta 1.0.0 version.
fsMetaVersion100 = "1.0.0"
// FS backend meta 1.0.1 version.
fsMetaVersion = "1.0.1"
// FS backend meta format.
fsMetaFormat = "fs"
// Add more constants here.
)
// 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"`
}
// IsValid - tells if the format is sane by validating the version
// string and format style.
func (m fsMetaV1) IsValid() bool {
return isFSMetaValid(m.Version, m.Format)
}
// Verifies if the backend format metadata is sane by validating
// the version string and format style.
func isFSMetaValid(version, format string) bool {
return ((version == fsMetaVersion || version == fsMetaVersion100) &&
format == fsMetaFormat)
}
// Converts metadata to object info.
func (m fsMetaV1) ToObjectInfo(bucket, object string, fi os.FileInfo) ObjectInfo {
if len(m.Meta) == 0 {
m.Meta = make(map[string]string)
}
// Guess content-type from the extension if possible.
if m.Meta["content-type"] == "" {
if objectExt := pathutil.Ext(object); objectExt != "" {
if content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]; ok {
m.Meta["content-type"] = content.ContentType
}
}
}
if hasSuffix(object, slashSeparator) {
m.Meta["etag"] = emptyETag // For directories etag is d41d8cd98f00b204e9800998ecf8427e
m.Meta["content-type"] = "application/octet-stream"
}
objInfo := ObjectInfo{
Bucket: bucket,
Name: object,
}
// We set file info only if its valid.
objInfo.ModTime = timeSentinel
if fi != nil {
objInfo.ModTime = fi.ModTime()
objInfo.Size = fi.Size()
if fi.IsDir() {
// Directory is always 0 bytes in S3 API, treat it as such.
objInfo.Size = 0
objInfo.IsDir = fi.IsDir()
}
}
// Extract etag from metadata.
objInfo.ETag = extractETag(m.Meta)
objInfo.ContentType = m.Meta["content-type"]
objInfo.ContentEncoding = m.Meta["content-encoding"]
// etag/md5Sum has already been extracted. We need to
// remove to avoid it from appearing as part of
// response headers. e.g, X-Minio-* or X-Amz-*.
objInfo.UserDefined = cleanMetadata(m.Meta)
// Success..
return objInfo
}
func (m *fsMetaV1) WriteTo(lk *lock.LockedFile) (n int64, err error) {
if err = jsonSave(lk, m); err != nil {
return 0, err
}
fi, err := lk.Stat()
if err != nil {
return 0, err
}
return fi.Size(), nil
}
func parseFSVersion(fsMetaBuf []byte) string {
return gjson.GetBytes(fsMetaBuf, "version").String()
}
func parseFSFormat(fsMetaBuf []byte) string {
return gjson.GetBytes(fsMetaBuf, "format").String()
}
func parseFSRelease(fsMetaBuf []byte) string {
return gjson.GetBytes(fsMetaBuf, "minio.release").String()
}
func parseFSMetaMap(fsMetaBuf []byte) map[string]string {
// Get xlMetaV1.Meta map.
metaMapResult := gjson.GetBytes(fsMetaBuf, "meta").Map()
metaMap := make(map[string]string)
for key, valResult := range metaMapResult {
metaMap[key] = valResult.String()
}
return metaMap
}
func (m *fsMetaV1) ReadFrom(lk *lock.LockedFile) (n int64, err error) {
var fsMetaBuf []byte
fi, err := lk.Stat()
if err != nil {
return 0, errors.Trace(err)
}
fsMetaBuf, err = ioutil.ReadAll(io.NewSectionReader(lk, 0, fi.Size()))
if err != nil {
return 0, errors.Trace(err)
}
if len(fsMetaBuf) == 0 {
return 0, errors.Trace(io.EOF)
}
// obtain version.
m.Version = parseFSVersion(fsMetaBuf)
// obtain format.
m.Format = parseFSFormat(fsMetaBuf)
// Verify if the format is valid, return corrupted format
// for unrecognized formats.
if !isFSMetaValid(m.Version, m.Format) {
return 0, errors.Trace(errCorruptedFormat)
}
// obtain metadata.
m.Meta = parseFSMetaMap(fsMetaBuf)
// obtain minio release date.
m.Minio.Release = parseFSRelease(fsMetaBuf)
// Success.
return int64(len(fsMetaBuf)), nil
}
// newFSMetaV1 - initializes new fsMetaV1.
func newFSMetaV1() (fsMeta fsMetaV1) {
fsMeta = fsMetaV1{}
fsMeta.Version = fsMetaVersion
fsMeta.Format = fsMetaFormat
fsMeta.Minio.Release = ReleaseTag
return fsMeta
}