/
etcd_data_transformer.go
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/
etcd_data_transformer.go
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// Copyright 2019 NetApp, Inc. All Rights Reserved.
package persistentstore
import (
"fmt"
"github.com/google/uuid"
log "github.com/sirupsen/logrus"
"github.com/netapp/trident/config"
"github.com/netapp/trident/storage"
)
type EtcdDataTransformer struct {
etcdClient Client
dryRun bool
shouldPersist bool
}
type EtcdDataTransformerResult struct {
Backends []*storage.BackendPersistent
Volumes []*storage.VolumeExternal
}
func NewEtcdDataTransformer(etcdClient Client, dryRun, shouldPersist bool) *EtcdDataTransformer {
return &EtcdDataTransformer{
etcdClient: etcdClient,
dryRun: dryRun,
shouldPersist: shouldPersist,
}
}
func (m *EtcdDataTransformer) RunPrechecks() error {
// Ensure we have valid etcd V3 data present
etcdVersion, err := m.etcdClient.GetVersion()
if err != nil {
if MatchKeyNotFoundErr(err) {
return fmt.Errorf("etcdv3 data not found, install an earlier Trident version in the range " +
"[v18.01, v19.01] to automatically upgrade from etcdv2 to etcdv3")
} else {
return fmt.Errorf("could not check for etcdv3 data; %v", err)
}
} else {
log.WithFields(log.Fields{
"PersistentStoreVersion": etcdVersion.PersistentStoreVersion,
"OrchestratorAPIVersion": etcdVersion.OrchestratorAPIVersion,
}).Debug("Found etcdv3 persistent state version.")
if etcdVersion.PersistentStoreVersion == string(EtcdV3Store) {
// we should upgrade from EtcdV3Store -> EtcdV3bStore
return nil
} else if etcdVersion.PersistentStoreVersion == string(EtcdV3bStore) {
// nothing to do at this time
return nil
} else {
// can't upgrade
return fmt.Errorf("etcd persistent state version is %s, not %s",
etcdVersion.PersistentStoreVersion, EtcdV3Store)
}
}
return nil
}
func (m *EtcdDataTransformer) Run() (*EtcdDataTransformerResult, error) {
backends, err := m.upgradeBackendsToUseUUIDs()
if err != nil {
return nil, err
}
volumes, err := m.upgradeVolumesToUseBackendUUIDs(backends)
if err != nil {
return nil, err
}
volumes, err = m.upgradeVolumesToUseVolumeState(volumes)
if err != nil {
return nil, err
}
if err := m.persistBackends(backends); err != nil {
return nil, err
}
if err := m.persistVolumes(volumes); err != nil {
return nil, err
}
if err := m.writeEtcdSchemaVersion(); err != nil {
return nil, err
}
if m.dryRun {
log.Info("Transformation dry run completed, no problems found.")
} else {
log.Info("Transformation succeeded.")
}
result := &EtcdDataTransformerResult{
Backends: backends,
Volumes: volumes,
}
return result, nil
}
func (m *EtcdDataTransformer) upgradeBackendsToUseUUIDs() ([]*storage.BackendPersistent, error) {
// get the backends
backends, err := m.etcdClient.GetBackends()
if err != nil {
return nil, fmt.Errorf("could not read backends from etcd; %v", err)
}
if len(backends) == 0 {
if m.dryRun {
log.Info("Dry run: no backends found.")
} else {
log.Info("No backends found, none will be modified.")
}
return nil, nil
}
if m.dryRun {
log.WithField("count", len(backends)).Info("Dry run: read all backends.")
return nil, nil
}
for _, backend := range backends {
if backend.BackendUUID == "" {
backend.BackendUUID = uuid.New().String()
log.WithFields(log.Fields{
"backend": backend.Name,
"backendUUID": backend.BackendUUID,
}).Debug("Transformed backend.")
}
}
log.WithField("count", len(backends)).Info("Transformed backends to have UUIDs.")
return backends, nil
}
func (m *EtcdDataTransformer) upgradeVolumesToUseBackendUUIDs(backends []*storage.BackendPersistent) ([]*storage.VolumeExternal, error) {
// get the volumes
volumes, err := m.etcdClient.GetVolumes()
if err != nil {
return nil, fmt.Errorf("could not read volumes from etcd; %v", err)
}
if len(volumes) == 0 {
if m.dryRun {
log.Info("Dry run: no volumes found.")
} else {
log.Info("No volumes found, none will be modified.")
}
return nil, nil
}
if m.dryRun {
log.WithField("count", len(volumes)).Info("Dry run: read all volumes.")
return nil, nil
}
// lookup UUIDs for backends
backendUUIDsByName := make(map[string]string)
for _, backend := range backends {
backendUUIDsByName[backend.Name] = backend.BackendUUID
}
// update volumes that are missing backendUUIDs to use them
for _, volume := range volumes {
if volume.BackendUUID == "" {
// look up the backend's UUID and modify the Volume to use the UUID
backendName := volume.Backend
backendUUID := backendUUIDsByName[backendName]
volume.BackendUUID = backendUUID
volume.Backend = ""
log.WithFields(log.Fields{
"volume": volume.Config.Name,
"volume.backend": backendName,
"volume.backendUUID": volume.BackendUUID,
}).Debug("Transformed volume.")
} else {
log.WithFields(log.Fields{
"volume": volume.Config.Name,
"volume.backend": volume.Backend,
"volume.backendUUID": volume.BackendUUID,
}).Debug("Skipped volume.")
}
}
log.WithField("count", len(volumes)).Info("Transformed volumes to use backend UUIDs.")
return volumes, nil
}
func (m *EtcdDataTransformer) upgradeVolumesToUseVolumeState(volumes []*storage.VolumeExternal) ([]*storage.VolumeExternal, error) {
if len(volumes) == 0 {
return nil, nil
}
if m.dryRun {
return nil, nil
}
// update volumes to use volumeState
for _, volume := range volumes {
if volume.State.IsUnknown() {
volume.State = storage.VolumeStateOnline
log.WithFields(log.Fields{
"volume": volume.Config.Name,
"volume.state": volume.State,
}).Debug("Transformed volume.")
} else {
log.WithFields(log.Fields{
"volume": volume.Config.Name,
"volume.state": volume.State,
}).Debug("Skipped volume.")
}
}
log.WithField("count", len(volumes)).Info("Transformed volumes to use volume state.")
return volumes, nil
}
func (m *EtcdDataTransformer) persistBackends(backends []*storage.BackendPersistent) error {
if m.dryRun {
return nil
}
if !m.shouldPersist {
return nil
}
for _, backend := range backends {
if err := m.etcdClient.UpdateBackendPersistent(backend); err != nil {
return fmt.Errorf("could not write backend resource; %v", err)
}
log.WithFields(log.Fields{
"backend": backend.Name,
"backendUUID": backend.BackendUUID,
}).Debug("Persisted backend.")
}
return nil
}
func (m *EtcdDataTransformer) persistVolumes(volumes []*storage.VolumeExternal) error {
if m.dryRun {
return nil
}
if !m.shouldPersist {
return nil
}
for _, volume := range volumes {
if err := m.etcdClient.UpdateVolumePersistent(volume); err != nil {
return fmt.Errorf("could not write volume resource; %v", err)
}
log.WithFields(log.Fields{
"volume": volume.Config.Name,
}).Debug("Persisted volume.")
}
return nil
}
func (m *EtcdDataTransformer) writeEtcdSchemaVersion() error {
if m.dryRun {
return nil
}
if !m.shouldPersist {
return nil
}
etcdVersion3b := &config.PersistentStateVersion{
PersistentStoreVersion: string(EtcdV3bStore),
OrchestratorAPIVersion: config.OrchestratorAPIVersion,
}
if err := m.etcdClient.SetVersion(etcdVersion3b); err != nil {
return fmt.Errorf("failed to set the persistent state version after transformation: %v", err)
}
log.WithFields(log.Fields{
"PersistentStoreVersion": etcdVersion3b.PersistentStoreVersion,
"OrchestratorAPIVersion": etcdVersion3b.OrchestratorAPIVersion,
}).Info("Wrote Etcd-based persistent state version.")
return nil
}