80 lines
1.7 KiB
Go
80 lines
1.7 KiB
Go
package database
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import (
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domain "RenewCMS/internal/domain/update"
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"bufio"
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"os"
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"time"
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)
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const (
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dumpFileExtension = ".sql"
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dumpPartialFileExtension = ".partial"
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)
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type DumpBackup struct {
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open func() (DumpSource, error)
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directory string
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now func() time.Time
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}
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var _ domain.DatabaseBackup = &DumpBackup{}
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func NewDumpBackup(open func() (DumpSource, error), directory string, now func() time.Time) *DumpBackup {
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return &DumpBackup{open: open, directory: directory, now: now}
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}
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func (b *DumpBackup) Backup() (string, error) {
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target, err := newBackupTarget(b.directory, b.now(), dumpFileExtension)
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if err != nil {
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return "", err
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}
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if err := b.writeAtomically(target); err != nil {
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return "", err
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}
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if err := pruneBackups(b.directory, dumpFileExtension); err != nil {
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return "", err
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}
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return target, nil
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}
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func (b *DumpBackup) writeAtomically(target string) error {
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partial := target + dumpPartialFileExtension
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if err := b.writePartial(partial); err != nil {
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_ = os.Remove(partial)
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return err
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}
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if err := os.Rename(partial, target); err != nil {
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_ = os.Remove(partial)
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return err
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}
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return nil
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}
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func (b *DumpBackup) writePartial(partial string) error {
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source, err := b.open()
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if err != nil {
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return err
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}
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defer source.Close()
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file, err := os.OpenFile(partial, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0o600)
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if err != nil {
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return err
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}
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buffered := bufio.NewWriter(file)
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if err := WriteDump(buffered, source); err != nil {
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_ = file.Close()
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return err
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}
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if err := buffered.Flush(); err != nil {
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_ = file.Close()
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return err
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}
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if err := file.Sync(); err != nil {
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_ = file.Close()
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return err
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}
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return file.Close()
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}
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