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/*
* (c) Copyright 2020 Palantir Technologies Inc. All rights reserved.
*
* 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.palantir.atlasdb.factory;
import com.palantir.logsafe.Preconditions;
import com.palantir.logsafe.SafeArg;
import com.palantir.logsafe.logger.SafeLogger;
import com.palantir.logsafe.logger.SafeLoggerFactory;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public final class PersistentStoragePathSanitizer {
private static final SafeLogger log = SafeLoggerFactory.get(PersistentStoragePathSanitizer.class);
private static final String MAGIC_SUFFIX = "atlasdb-persistent-storage";
private PersistentStoragePathSanitizer() {}
/**
* For the given path deletes all files and directories under the folder named {@code MAGIC_SUFFIX}.
*
* @param storagePath to the proposed storage location
*/
public static Path sanitizeStoragePath(String storagePath) {
File storageDirectory = new File(storagePath, MAGIC_SUFFIX);
Preconditions.checkArgument(
storageDirectory.getParentFile().isDirectory(),
"Storage path has to point to a directory",
SafeArg.of("storageDirectory", storageDirectory.getParentFile().getAbsolutePath()));
if (!storageDirectory.exists()) {
Preconditions.checkState(
storageDirectory.mkdir(),
"Not able to create a storage directory",
SafeArg.of("storageDirectory", storageDirectory.getAbsolutePath()));
return storageDirectory.toPath().toAbsolutePath();
}
Preconditions.checkState(
storageDirectory.isDirectory(),
"Dedicated persistent storage path does not point to a directory. "
+ "Note this is not the same as the provided storage path as we create a special subfolder.",
SafeArg.of("storageDirectory", storageDirectory.getAbsolutePath()));
try {
deletePath(storageDirectory.toPath().toAbsolutePath());
} catch (IOException e) {
throw new RuntimeException(e);
}
return storageDirectory.toPath().toAbsolutePath();
}
private static void deletePath(Path absolutePath) throws IOException {
Preconditions.checkArgument(
absolutePath.isAbsolute(),
"Deletion path needs to be absolute",
SafeArg.of("path", absolutePath.toString()));
log.info("Deleted folder during sanitization.", SafeArg.of("path", absolutePath));
try (Stream stream = Files.walk(absolutePath)) {
List sortedPaths = stream.sorted(Comparator.reverseOrder()).collect(Collectors.toList());
for (Path filePath : sortedPaths) {
Files.delete(filePath);
}
}
}
}