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restore: implement DeltaRestoreOperations methods
Longhorn 6576 Signed-off-by: Derek Su <derek.su@suse.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,153 @@ | ||
| package replica | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os" | ||
| "sync" | ||
|
|
||
| "github.com/pkg/errors" | ||
| "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| type RestoreStatus struct { | ||
| sync.RWMutex | ||
| replicaAddress string | ||
| Progress int | ||
| Error string | ||
| BackupURL string | ||
| State ProgressState | ||
|
|
||
| // The file that (temporarily) stores the data during the restoring. | ||
| ToFileName string | ||
| // The snapshot file that stores the restored data in the end. | ||
| SnapshotDiskName string | ||
|
|
||
| LastRestored string | ||
| CurrentRestoringBackup string | ||
|
|
||
| stopOnce sync.Once | ||
| stopChan chan struct{} | ||
| } | ||
|
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| func NewRestore(snapshotName, replicaAddress, backupURL, currentRestoringBackup string) *RestoreStatus { | ||
| return &RestoreStatus{ | ||
| replicaAddress: replicaAddress, | ||
| ToFileName: snapshotName, | ||
| SnapshotDiskName: snapshotName, | ||
| State: ProgressStateInProgress, | ||
| Progress: 0, | ||
| BackupURL: backupURL, | ||
| CurrentRestoringBackup: currentRestoringBackup, | ||
| stopChan: make(chan struct{}), | ||
| } | ||
| } | ||
|
|
||
| func (status *RestoreStatus) StartNewRestore(backupURL, currentRestoringBackup, toFileName, snapshotDiskName string, validLastRestoredBackup bool) { | ||
| status.Lock() | ||
| defer status.Unlock() | ||
| status.ToFileName = toFileName | ||
|
|
||
| status.Progress = 0 | ||
| status.Error = "" | ||
| status.BackupURL = backupURL | ||
| status.State = ProgressStateInProgress | ||
| status.SnapshotDiskName = snapshotDiskName | ||
| if !validLastRestoredBackup { | ||
| status.LastRestored = "" | ||
| } | ||
| status.CurrentRestoringBackup = currentRestoringBackup | ||
| } | ||
|
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| func (status *RestoreStatus) OpenVolumeDev(volDevName string) (*os.File, string, error) { | ||
| if _, err := os.Stat(volDevName); err == nil { | ||
| logrus.WithError(err).Warnf("File %s for the restore exists, will remove and re-create it", volDevName) | ||
| if err := os.RemoveAll(volDevName); err != nil { | ||
| return nil, "", errors.Wrapf(err, "failed to clean up the existing file %v before restore", volDevName) | ||
| } | ||
| } | ||
|
|
||
| file, err := os.Create(volDevName) | ||
| return file, volDevName, err | ||
| } | ||
|
|
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| func (status *RestoreStatus) CloseVolumeDev(volDev *os.File) error { | ||
| if volDev == nil { | ||
| return nil | ||
| } | ||
| return volDev.Close() | ||
| } | ||
|
|
||
| func (status *RestoreStatus) UpdateRestoreStatus(snapshot string, rp int, re error) { | ||
| status.Lock() | ||
| defer status.Unlock() | ||
|
|
||
| status.ToFileName = snapshot | ||
| status.Progress = rp | ||
| if re != nil { | ||
| if status.Error != "" { | ||
| status.Error = fmt.Sprintf("%v: %v", re.Error(), status.Error) | ||
| } else { | ||
| status.Error = re.Error() | ||
| } | ||
| status.State = ProgressStateError | ||
| status.CurrentRestoringBackup = "" | ||
| } | ||
| } | ||
|
|
||
| func (status *RestoreStatus) FinishRestore() { | ||
| status.Lock() | ||
| defer status.Unlock() | ||
| if status.State != ProgressStateError { | ||
| status.State = ProgressStateComplete | ||
| status.LastRestored = status.CurrentRestoringBackup | ||
| status.CurrentRestoringBackup = "" | ||
| } | ||
| } | ||
|
|
||
| // Revert is used for reverting the current restore status to the previous status. | ||
| // This function will be invoked when: | ||
| // 1. The new restore is failed before the actual restore is performed. | ||
| // 2. The existing files are not modified. | ||
| // 3. The current status has been updated/initialized for the new restore. | ||
| // | ||
| // If there is no modification applied on the existing replica disk files after the restore failure, | ||
| // it means the replica is still available. In order to make sure the replica work fine | ||
| // for the next restore and the status is not messed up, the revert is indispensable. | ||
| func (status *RestoreStatus) Revert(previousStatus *RestoreStatus) { | ||
| status.Lock() | ||
| defer status.Unlock() | ||
|
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||
| status.BackupURL = previousStatus.BackupURL | ||
| status.Progress = previousStatus.Progress | ||
| status.State = previousStatus.State | ||
| status.Error = previousStatus.Error | ||
| status.ToFileName = previousStatus.ToFileName | ||
| status.SnapshotDiskName = previousStatus.SnapshotDiskName | ||
| status.LastRestored = previousStatus.LastRestored | ||
| status.CurrentRestoringBackup = previousStatus.CurrentRestoringBackup | ||
| } | ||
|
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||
| func (status *RestoreStatus) DeepCopy() *RestoreStatus { | ||
| status.RLock() | ||
| defer status.RUnlock() | ||
| return &RestoreStatus{ | ||
| ToFileName: status.ToFileName, | ||
| Progress: status.Progress, | ||
| Error: status.Error, | ||
| LastRestored: status.LastRestored, | ||
| SnapshotDiskName: status.SnapshotDiskName, | ||
| BackupURL: status.BackupURL, | ||
| State: status.State, | ||
| CurrentRestoringBackup: status.CurrentRestoringBackup, | ||
| } | ||
| } | ||
|
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||
| func (status *RestoreStatus) Stop() { | ||
| status.stopOnce.Do(func() { | ||
| close(status.stopChan) | ||
| }) | ||
| } | ||
|
|
||
| func (status *RestoreStatus) GetStopChan() chan struct{} { | ||
| return status.stopChan | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,11 @@ | ||
| package replica | ||
|
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| type ProgressState string | ||
|
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| const ( | ||
| backupBlockSize = 2 << 20 // 2MiB | ||
|
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| ProgressStateInProgress = ProgressState("in_progress") | ||
| ProgressStateComplete = ProgressState("complete") | ||
| ProgressStateError = ProgressState("error") | ||
| ) |