mirror of https://github.com/minio/minio.git
126 lines
2.9 KiB
Go
126 lines
2.9 KiB
Go
package main
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import (
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"bytes"
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"encoding/json"
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"io"
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"path"
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"sort"
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)
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const (
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fsMetaJSONFile = "fs.json"
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)
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// A fsMetaV1 represents a metadata header mapping keys to sets of values.
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type fsMetaV1 struct {
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Version string `json:"version"`
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Format string `json:"format"`
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Minio struct {
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Release string `json:"release"`
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} `json:"minio"`
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Parts []objectPartInfo `json:"parts,omitempty"`
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}
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// ReadFrom - read from implements io.ReaderFrom interface for
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// unmarshalling fsMetaV1.
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func (m *fsMetaV1) ReadFrom(reader io.Reader) (n int64, err error) {
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var buffer bytes.Buffer
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n, err = buffer.ReadFrom(reader)
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if err != nil {
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return 0, err
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}
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err = json.Unmarshal(buffer.Bytes(), m)
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return n, err
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}
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// WriteTo - write to implements io.WriterTo interface for marshalling fsMetaV1.
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func (m fsMetaV1) WriteTo(writer io.Writer) (n int64, err error) {
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metadataBytes, err := json.Marshal(m)
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if err != nil {
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return 0, err
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}
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p, err := writer.Write(metadataBytes)
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return int64(p), err
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}
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// ObjectPartIndex - returns the index of matching object part number.
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func (m fsMetaV1) ObjectPartIndex(partNumber int) (partIndex int) {
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for i, part := range m.Parts {
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if partNumber == part.Number {
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partIndex = i
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return partIndex
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}
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}
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return -1
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}
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// AddObjectPart - add a new object part in order.
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func (m *fsMetaV1) AddObjectPart(partNumber int, partName string, partETag string, partSize int64) {
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partInfo := objectPartInfo{
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Number: partNumber,
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Name: partName,
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ETag: partETag,
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Size: partSize,
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}
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// Update part info if it already exists.
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for i, part := range m.Parts {
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if partNumber == part.Number {
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m.Parts[i] = partInfo
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return
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}
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}
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// Proceed to include new part info.
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m.Parts = append(m.Parts, partInfo)
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// Parts in fsMeta should be in sorted order by part number.
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sort.Sort(byPartNumber(m.Parts))
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}
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// readFSMetadata - returns the object metadata `fs.json` content.
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func (fs fsObjects) readFSMetadata(bucket, object string) (fsMeta fsMetaV1, err error) {
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r, err := fs.storage.ReadFile(bucket, path.Join(object, fsMetaJSONFile), int64(0))
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if err != nil {
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return fsMetaV1{}, err
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}
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defer r.Close()
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_, err = fsMeta.ReadFrom(r)
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if err != nil {
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return fsMetaV1{}, err
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}
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return fsMeta, nil
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}
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// newFSMetaV1 - initializes new fsMetaV1.
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func newFSMetaV1() (fsMeta fsMetaV1) {
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fsMeta = fsMetaV1{}
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fsMeta.Version = "1"
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fsMeta.Format = "fs"
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fsMeta.Minio.Release = minioReleaseTag
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return fsMeta
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}
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// writeFSMetadata - writes `fs.json` metadata.
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func (fs fsObjects) writeFSMetadata(bucket, prefix string, fsMeta fsMetaV1) error {
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w, err := fs.storage.CreateFile(bucket, path.Join(prefix, fsMetaJSONFile))
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if err != nil {
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return err
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}
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_, err = fsMeta.WriteTo(w)
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if err != nil {
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if mErr := safeCloseAndRemove(w); mErr != nil {
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return mErr
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}
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return err
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}
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if err = w.Close(); err != nil {
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if mErr := safeCloseAndRemove(w); mErr != nil {
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return mErr
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}
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return err
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}
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return nil
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}
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