/*
* 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.
*/
package com.facebook.presto.raptor.backup;
import com.facebook.presto.spi.PrestoException;
import com.google.common.annotations.VisibleForTesting;
import javax.annotation.PostConstruct;
import javax.inject.Inject;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.UUID;
import static com.facebook.presto.raptor.RaptorErrorCode.RAPTOR_BACKUP_ERROR;
import static com.facebook.presto.raptor.RaptorErrorCode.RAPTOR_BACKUP_NOT_FOUND;
import static com.facebook.presto.raptor.storage.FileStorageService.getFileSystemPath;
import static java.nio.file.Files.deleteIfExists;
import static java.util.Objects.requireNonNull;
public class FileBackupStore
implements BackupStore
{
private final File baseDir;
@Inject
public FileBackupStore(FileBackupConfig config)
{
this(config.getBackupDirectory());
}
public FileBackupStore(File baseDir)
{
this.baseDir = requireNonNull(baseDir, "baseDir is null");
}
@PostConstruct
public void start()
{
createDirectories(baseDir);
}
@Override
public void backupShard(UUID uuid, File source)
{
File backupFile = getBackupFile(uuid);
try {
try {
// Optimistically assume the file can be created
copyFile(source, backupFile);
}
catch (FileNotFoundException e) {
createDirectories(backupFile.getParentFile());
copyFile(source, backupFile);
}
}
catch (IOException e) {
throw new PrestoException(RAPTOR_BACKUP_ERROR, "Failed to create backup shard file", e);
}
}
@Override
public void restoreShard(UUID uuid, File target)
{
try {
copyFile(getBackupFile(uuid), target);
}
catch (FileNotFoundException e) {
throw new PrestoException(RAPTOR_BACKUP_NOT_FOUND, "Backup shard not found: " + uuid, e);
}
catch (IOException e) {
throw new PrestoException(RAPTOR_BACKUP_ERROR, "Failed to copy backup shard: " + uuid, e);
}
}
@Override
public boolean deleteShard(UUID uuid)
{
try {
return deleteIfExists(getBackupFile(uuid).toPath());
}
catch (IOException e) {
throw new PrestoException(RAPTOR_BACKUP_ERROR, "Failed to delete backup shard: " + uuid, e);
}
}
@Override
public boolean shardExists(UUID uuid)
{
return getBackupFile(uuid).isFile();
}
@VisibleForTesting
public File getBackupFile(UUID uuid)
{
return getFileSystemPath(baseDir, uuid);
}
private static void createDirectories(File dir)
{
if (!dir.mkdirs() && !dir.isDirectory()) {
throw new PrestoException(RAPTOR_BACKUP_ERROR, "Failed creating directories: " + dir);
}
}
private static void copyFile(File source, File target)
throws IOException
{
try (InputStream in = new FileInputStream(source);
FileOutputStream out = new FileOutputStream(target)) {
byte[] buffer = new byte[128 * 1024];
while (true) {
int n = in.read(buffer);
if (n == -1) {
break;
}
out.write(buffer, 0, n);
}
out.flush();
out.getFD().sync();
}
}
}