engine/storage/snapshot/src/main/java/org/apache/cloudstack/storage/snapshot/ScaleIOSnapshotStrategy.java

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//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.cloudstack.storage.snapshot;

import javax.inject.Inject;

import org.apache.cloudstack.engine.subsystem.api.storage.SnapshotInfo;
import org.apache.cloudstack.engine.subsystem.api.storage.StrategyPriority;
import org.apache.cloudstack.engine.subsystem.api.storage.VolumeInfo;
import org.apache.cloudstack.storage.datastore.db.PrimaryDataStoreDao;
import org.apache.cloudstack.storage.datastore.db.SnapshotDataStoreDao;
import org.apache.cloudstack.storage.datastore.db.SnapshotDataStoreVO;
import org.apache.cloudstack.storage.datastore.db.StoragePoolVO;
import org.apache.log4j.Logger;

import com.cloud.storage.DataStoreRole;
import com.cloud.storage.Snapshot;
import com.cloud.storage.Storage;
import com.cloud.storage.VolumeVO;
import com.cloud.storage.dao.VolumeDao;

public class ScaleIOSnapshotStrategy extends StorageSystemSnapshotStrategy {
    @Inject
    private SnapshotDataStoreDao snapshotStoreDao;
    @Inject
    private PrimaryDataStoreDao primaryDataStoreDao;
    @Inject
    private VolumeDao volumeDao;

    private static final Logger LOG = Logger.getLogger(ScaleIOSnapshotStrategy.class);

    @Override
    public StrategyPriority canHandle(Snapshot snapshot, SnapshotOperation op) {
        long volumeId = snapshot.getVolumeId();
        VolumeVO volumeVO = volumeDao.findByIdIncludingRemoved(volumeId);
        boolean baseVolumeExists = volumeVO.getRemoved() == null;
        if (!baseVolumeExists) {
            return StrategyPriority.CANT_HANDLE;
        }

        if (!isSnapshotStoredOnScaleIOStoragePool(snapshot)) {
            return StrategyPriority.CANT_HANDLE;
        }

        if (SnapshotOperation.REVERT.equals(op)) {
            return StrategyPriority.HIGHEST;
        }

        if (SnapshotOperation.DELETE.equals(op)) {
            return StrategyPriority.HIGHEST;
        }

        return StrategyPriority.CANT_HANDLE;
    }

    @Override
    public boolean revertSnapshot(SnapshotInfo snapshotInfo) {
        VolumeInfo volumeInfo = snapshotInfo.getBaseVolume();
        Storage.ImageFormat imageFormat = volumeInfo.getFormat();
        if (!Storage.ImageFormat.RAW.equals(imageFormat)) {
            LOG.error(String.format("Does not support revert snapshot of the image format [%s] on PowerFlex. Can only rollback snapshots of format RAW", imageFormat));
            return false;
        }

        executeRevertSnapshot(snapshotInfo, volumeInfo);

        return true;
    }

    protected boolean isSnapshotStoredOnScaleIOStoragePool(Snapshot snapshot) {
        SnapshotDataStoreVO snapshotStore = snapshotStoreDao.findBySnapshot(snapshot.getId(), DataStoreRole.Primary);
        if (snapshotStore == null) {
            return false;
        }
        StoragePoolVO storagePoolVO = primaryDataStoreDao.findById(snapshotStore.getDataStoreId());
        return storagePoolVO != null && storagePoolVO.getPoolType() == Storage.StoragePoolType.PowerFlex;
    }
}