forked from TrueCloudLab/restic
119 lines
1.7 KiB
Go
119 lines
1.7 KiB
Go
package khepri
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import "os"
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type Object struct {
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repo *Repository
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id ID
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tpe Type
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hw HashingWriter
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file *os.File
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}
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func (repo *Repository) NewObject(t Type) (*Object, error) {
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obj := &Object{
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repo: repo,
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tpe: t,
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}
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return obj, obj.open()
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}
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func (obj *Object) open() error {
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if obj.isFinal() {
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panic("object is finalized")
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}
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if obj.isOpen() {
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panic("object already open")
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}
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// create tempfile in repository
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if obj.hw == nil {
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// save contents to tempfile, hash while writing
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var err error
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obj.file, err = obj.repo.tempFile()
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if err != nil {
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return err
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}
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// create hashing writer
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obj.hw = NewHashingWriter(obj.file, obj.repo.hash)
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}
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return nil
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}
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func (obj *Object) isOpen() bool {
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return obj.file != nil && obj.hw != nil
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}
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func (obj *Object) isFinal() bool {
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return obj.id != nil
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}
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func (obj *Object) Write(data []byte) (int, error) {
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if !obj.isOpen() {
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panic("object not open")
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}
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return obj.hw.Write(data)
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}
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func (obj *Object) Close() error {
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if obj.file == nil || obj.hw == nil {
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panic("object is not open")
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}
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obj.file.Close()
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hash := obj.hw.Hash()
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// move file to final name using hash of contents
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id := ID(hash)
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err := obj.repo.renameFile(obj.file, obj.tpe, id)
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if err != nil {
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return err
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}
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obj.hw = nil
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obj.file = nil
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obj.id = id
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return nil
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}
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func (obj *Object) ID() ID {
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if !obj.isFinal() {
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panic("object not finalized")
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}
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return obj.id
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}
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func (obj *Object) Type() Type {
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return obj.tpe
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}
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func (obj *Object) Remove() error {
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if obj.id != nil {
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return obj.repo.Remove(obj.tpe, obj.id)
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}
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if obj.file != nil {
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file := obj.file
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obj.hw = nil
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obj.file = nil
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err := file.Close()
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if err != nil {
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return err
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}
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return os.Remove(file.Name())
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}
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return nil
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}
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