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minio/fs-v1-metadata.go

106 lines
2.5 KiB

package main
import (
"bytes"
"encoding/json"
"io"
"path"
"sort"
)
// 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"`
Checksum struct {
Enable bool `json:"enable"`
} `json:"checksum"`
Parts []objectPartInfo `json:"parts,omitempty"`
}
// ReadFrom - read from implements io.ReaderFrom interface for
// unmarshalling fsMetaV1.
func (m *fsMetaV1) ReadFrom(reader io.Reader) (n int64, err error) {
var buffer bytes.Buffer
n, err = buffer.ReadFrom(reader)
if err != nil {
return 0, err
}
err = json.Unmarshal(buffer.Bytes(), m)
return n, err
}
// WriteTo - write to implements io.WriterTo interface for marshalling fsMetaV1.
func (m fsMetaV1) WriteTo(writer io.Writer) (n int64, err error) {
metadataBytes, err := json.Marshal(m)
if err != nil {
return 0, err
}
p, err := writer.Write(metadataBytes)
return int64(p), err
}
// SearchObjectPart - search object part name and etag.
func (m fsMetaV1) SearchObjectPart(name string, etag string) int {
for i, part := range m.Parts {
if name == part.Name && etag == part.ETag {
return i
}
}
return -1
}
// AddObjectPart - add a new object part in order.
func (m *fsMetaV1) AddObjectPart(name string, etag string, size int64) {
m.Parts = append(m.Parts, objectPartInfo{
Name: name,
ETag: etag,
Size: size,
})
sort.Sort(byPartName(m.Parts))
}
const (
fsMetaJSONFile = "fs.json"
)
// readFSMetadata - read `fs.json`.
func (fs fsObjects) readFSMetadata(bucket, object string) (fsMeta fsMetaV1, err error) {
r, err := fs.storage.ReadFile(bucket, path.Join(object, fsMetaJSONFile), int64(0))
if err != nil {
return fsMetaV1{}, err
}
defer r.Close()
_, err = fsMeta.ReadFrom(r)
if err != nil {
return fsMetaV1{}, err
}
return fsMeta, nil
}
// writeFSMetadata - write `fs.json`.
func (fs fsObjects) writeFSMetadata(bucket, prefix string, fsMeta fsMetaV1) error {
// Initialize metadata map, save all erasure related metadata.
fsMeta.Minio.Release = minioReleaseTag
w, err := fs.storage.CreateFile(bucket, path.Join(prefix, fsMetaJSONFile))
if err != nil {
return err
}
_, err = fsMeta.WriteTo(w)
if err != nil {
if mErr := safeCloseAndRemove(w); mErr != nil {
return mErr
}
return err
}
if err = w.Close(); err != nil {
if mErr := safeCloseAndRemove(w); mErr != nil {
return mErr
}
return err
}
return nil
}