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/*
* ============LICENSE_START=======================================================
* Copyright (C) 2021 Nordix Foundation
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.openecomp.sdc.be.csar.storage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardCopyOption;
import java.util.Optional;
import java.util.UUID;
import org.openecomp.sdc.be.csar.storage.exception.PersistentVolumeArtifactStorageException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class PersistentVolumeArtifactStorageManager implements ArtifactStorageManager {
private static final Logger LOGGER = LoggerFactory.getLogger(PersistentVolumeArtifactStorageManager.class);
private final PersistentVolumeArtifactStorageConfig storageConfiguration;
public PersistentVolumeArtifactStorageManager(final ArtifactStorageConfig storageConfiguration) {
this.storageConfiguration = (PersistentVolumeArtifactStorageConfig) storageConfiguration;
}
@Override
public ArtifactInfo persist(final String vspId, final String versionId, final ArtifactInfo uploadedArtifactInfo) {
final var temporaryPath = uploadedArtifactInfo.getPath();
if (!Files.exists(temporaryPath)) {
throw new PersistentVolumeArtifactStorageException(String.format("Given artifact does not exist '%s'", uploadedArtifactInfo.getPath()));
}
final var filePath = buildFilePath(vspId, versionId);
final var backupPath = backupPreviousVersion(filePath).orElse(null);
try {
moveFile(temporaryPath, filePath);
} catch (final Exception e) {
rollback(backupPath, filePath);
final var errorMsg = String.format("Could not persist artifact for VSP '%s', version '%s'", vspId, versionId);
throw new PersistentVolumeArtifactStorageException(errorMsg, e);
}
removePreviousVersion(backupPath);
return new PersistentStorageArtifactInfo(filePath);
}
@Override
public ArtifactInfo upload(final String vspId, final String versionId, final InputStream artifactInputStream) {
final var destinationFolder = buildDestinationFolder(vspId, versionId);
try {
Files.createDirectories(destinationFolder);
} catch (final IOException e) {
throw new PersistentVolumeArtifactStorageException(String.format("Could not create directory '%s'", destinationFolder), e);
}
final var filePath = createTempFilePath(destinationFolder);
try {
persist(artifactInputStream, filePath);
} catch (final IOException e) {
throw new PersistentVolumeArtifactStorageException(String.format("Could not persist artifact '%s'", filePath), e);
}
return new PersistentStorageArtifactInfo(filePath);
}
private Path buildFilePath(final String vspId, final String versionId) {
return buildDestinationFolder(vspId, versionId).resolve(versionId);
}
@Override
public boolean isEnabled() {
return storageConfiguration != null && storageConfiguration.isEnabled();
}
private Optional<Path> backupPreviousVersion(final Path filePath) {
if (!Files.exists(filePath)) {
return Optional.empty();
}
final var backupPath = Path.of(filePath + UUID.randomUUID().toString());
moveFile(filePath, backupPath);
return Optional.ofNullable(backupPath);
}
private void rollback(final Path backupPath, final Path filePath) {
try {
moveFile(backupPath, filePath);
} catch (final Exception ex) {
LOGGER.warn("Could not rollback the backup file '{}' to the original '{}'", backupPath, filePath, ex);
}
}
private void removePreviousVersion(final Path filePath) {
if (filePath == null || !Files.exists(filePath)) {
return;
}
try {
Files.delete(filePath);
} catch (final IOException e) {
throw new PersistentVolumeArtifactStorageException(String.format("Could not delete previous version '%s'", filePath), e);
}
}
private Path createTempFilePath(final Path destinationFolder) {
final var retries = 10;
return createTempFilePath(destinationFolder, retries).orElseThrow(() -> {
throw new PersistentVolumeArtifactStorageException(String.format("Could not generate upload file path after '%s' retries", retries));
});
}
private Optional<Path> createTempFilePath(final Path destinationFolder, int retries) {
for (var i = 0; i < retries; i++) {
final var filePath = destinationFolder.resolve(UUID.randomUUID().toString());
if (Files.notExists(filePath)) {
return Optional.of(filePath);
}
}
return Optional.empty();
}
private Path buildDestinationFolder(final String vspId, final String versionId) {
return storageConfiguration.getStoragePath().resolve(vspId).resolve(versionId);
}
private void persist(final InputStream artifactInputStream, final Path filePath) throws IOException {
try (final var inputStream = artifactInputStream;
final var fileOutputStream = new FileOutputStream(filePath.toFile());) {
inputStream.transferTo(fileOutputStream);
}
}
private void moveFile(final Path from, final Path to) {
try {
Files.move(from, to, StandardCopyOption.REPLACE_EXISTING);
} catch (final IOException e) {
throw new PersistentVolumeArtifactStorageException(String.format("Could not move file '%s' to '%s'", from, to), e);
}
}
}
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