/
backup_mark.go
209 lines (176 loc) · 6.16 KB
/
backup_mark.go
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package internal
import (
"github.com/pkg/errors"
"github.com/wal-g/tracelog"
"github.com/wal-g/wal-g/pkg/storages/storage"
"github.com/wal-g/wal-g/utility"
)
type BackupMarkHandler struct {
metaInteractor GenericMetaInteractor
storageRootFolder storage.Folder
baseBackupFolder storage.Folder
}
func NewBackupMarkHandler(metaInteractor GenericMetaInteractor, storageRootFolder storage.Folder) BackupMarkHandler {
return BackupMarkHandler{
metaInteractor: metaInteractor,
storageRootFolder: storageRootFolder,
baseBackupFolder: storageRootFolder.GetSubFolder(utility.BaseBackupPath),
}
}
// MarkBackup marks a backup as permanent or impermanent
func (h *BackupMarkHandler) MarkBackup(backupName string, toPermanent bool) {
tracelog.InfoLogger.Printf("Retrieving previous related backups to be marked: toPermanent=%t", toPermanent)
backupsToMark, err := h.GetBackupsToMark(backupName, toPermanent)
tracelog.ErrorLogger.FatalfOnError("Failed to get previous backups: %v", err)
tracelog.InfoLogger.Printf("Retrieved backups to be marked, marking: %v", backupsToMark)
for _, backupName := range backupsToMark {
err = h.metaInteractor.SetIsPermanent(backupName, h.baseBackupFolder, toPermanent)
tracelog.ErrorLogger.FatalfOnError("Failed to mark backups: %v", err)
}
}
// GetBackupsToMark retrieves all previous permanent or
// impermanent backups, including itself, any previous delta backups and
// initial full backup, in increasing order beginning from full backup,
// returning backups ready to be marked
//
// For example, when marking backups from impermanent to permanent, we retrieve
// all currently impermanent backups and return them as a slice
func (h *BackupMarkHandler) GetBackupsToMark(backupName string, toPermanent bool) ([]string, error) {
meta, err := h.metaInteractor.Fetch(backupName, h.baseBackupFolder)
if err != nil {
return nil, err
}
//raise error when backup already has that type
if toPermanent == meta.IsPermanent {
permanentType := "permanent"
if !meta.IsPermanent {
permanentType = "impermanent"
}
tracelog.WarningLogger.Printf("Backup %s is already marked as %s, ignoring...", backupName, permanentType)
}
if toPermanent {
return h.getBackupsToMarkPermanent(backupName)
}
return h.getBackupsToMarkImpermanent(backupName)
}
func (h *BackupMarkHandler) getBackupsToMarkPermanent(backupName string) ([]string, error) {
var backupsToMark []string
meta, err := h.metaInteractor.Fetch(backupName, h.baseBackupFolder)
if err != nil {
return nil, err
}
// only return backups that we want to update
if !meta.IsPermanent {
backupsToMark = append(backupsToMark, meta.BackupName)
}
isIncremental, incrementDetails, err := meta.IncrementDetails.Fetch()
if err != nil {
return nil, err
}
// return when no longer incremental
if !isIncremental {
return backupsToMark, nil
}
// mark previous backup
previousImpermanentBackups, err := h.getBackupsToMarkPermanent(incrementDetails.IncrementFrom)
if err != nil {
return nil, err
}
previousImpermanentBackups = append(previousImpermanentBackups, backupsToMark...)
return previousImpermanentBackups, nil
}
func (h *BackupMarkHandler) getBackupsToMarkImpermanent(backupName string) ([]string, error) {
meta, err := h.metaInteractor.Fetch(backupName, h.baseBackupFolder)
if err != nil {
return nil, err
}
permanentBackups := GetPermanentBackups(h.baseBackupFolder, h.metaInteractor)
// del current backup from
delete(permanentBackups, backupName)
reverseLinks, err := h.getGraphFromBaseToIncrement()
if err != nil {
return nil, err
}
if backupHasPermanentInFuture(&reverseLinks, backupName, &permanentBackups) {
return nil, newBackupHasPermanentBackupInFutureError(backupName)
}
if !meta.IsPermanent {
return []string{}, nil
}
return []string{meta.BackupName}, nil
}
// backup has permanent in future only when one of the next backups is permanent
func backupHasPermanentInFuture(reverseLinks *map[string][]string,
backupName string,
permanentBackups *map[string]bool) bool {
//if there is no next backups
if _, ok := (*reverseLinks)[backupName]; !ok {
return false
}
//if one of the next backups is permanent
for _, b := range (*reverseLinks)[backupName] {
if _, ok := (*permanentBackups)[b]; ok {
return true
}
}
return false
}
// return graph where nodes - backup names, edges - links from base backups to increment backups
func (h *BackupMarkHandler) getGraphFromBaseToIncrement() (map[string][]string, error) {
backups, err := GetBackups(h.baseBackupFolder)
if err != nil {
return nil, err
}
reverseLinks := make(map[string][]string)
for _, b := range backups {
incrementFrom, isIncrement, err := h.getMetadataFromBackup(b.BackupName)
if err != nil {
return nil, err
}
if isIncrement {
reverseLinks[incrementFrom] = append(reverseLinks[incrementFrom], b.BackupName)
}
}
return reverseLinks, nil
}
func (h *BackupMarkHandler) getMetadataFromBackup(backupName string) (incrementFrom string, isIncrement bool, err error) {
meta, err := h.metaInteractor.Fetch(backupName, h.baseBackupFolder)
if err != nil {
return "", false, err
}
isIncremental, incrementDetails, err := meta.IncrementDetails.Fetch()
if err != nil {
return "", false, err
}
if !isIncremental {
return "", false, nil
}
return incrementDetails.IncrementFrom, true, nil
}
type BackupHasPermanentBackupInFutureError struct {
error
}
func newBackupHasPermanentBackupInFutureError(backupName string) BackupHasPermanentBackupInFutureError {
return BackupHasPermanentBackupInFutureError{
errors.Errorf("Can't mark backup '%s' as impermanent. There is permanent increment backup.",
backupName)}
}
func GetPermanentBackups(folder storage.Folder, metaFetcher GenericMetaFetcher) map[string]bool {
tracelog.InfoLogger.Println("retrieving permanent objects")
backupTimes, err := GetBackups(folder)
if err != nil {
return map[string]bool{}
}
permanentBackups := map[string]bool{}
for _, backupTime := range backupTimes {
meta, err := metaFetcher.Fetch(backupTime.BackupName, folder)
if err != nil {
FatalOnUnrecoverableMetadataError(backupTime, err)
continue
}
if meta.IsPermanent {
permanentBackups[backupTime.BackupName] = true
}
}
return permanentBackups
}