Example #1
0
// Called to sync changes to disk when a volume is updated
func (m *Manager) persistVolume(tx *bolt.Tx, vol volume.Volume) error {
	// Save the general volume info
	volumesBucket := tx.Bucket([]byte("volumes"))
	id := vol.Info().ID
	k := []byte(id)
	_, volExists := m.volumes[id]
	if !volExists {
		volumesBucket.Delete(k)
	} else {
		b, err := json.Marshal(vol.Info())
		if err != nil {
			return fmt.Errorf("failed to serialize volume info: %s", err)
		}
		err = volumesBucket.Put(k, b)
		if err != nil {
			return fmt.Errorf("could not persist volume info to boltdb: %s", err)
		}
	}
	// Save any provider-specific metadata associated with the volume.
	// These are saved per-provider since the deserialization is also only defined per-provider implementation.
	providerBucket, err := m.getProviderBucket(tx, m.providerIDs[vol.Provider()])
	if err != nil {
		return fmt.Errorf("could not persist provider volume info to boltdb: %s", err)
	}
	providerVolumesBucket := providerBucket.Bucket([]byte("volumes"))
	if !volExists {
		providerVolumesBucket.Delete(k)
	} else {
		b, err := vol.Provider().MarshalVolumeState(id)
		if err != nil {
			return fmt.Errorf("failed to serialize provider volume info: %s", err)
		}
		err = providerVolumesBucket.Put(k, b)
		if err != nil {
			return fmt.Errorf("could not persist provider volume info to boltdb: %s", err)
		}
	}
	return nil
}