| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.solr.core.backup; |
| |
| import org.apache.solr.core.backup.repository.BackupRepository; |
| |
| import java.io.IOException; |
| import java.net.URI; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Comparator; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.Optional; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import static org.apache.solr.core.backup.BackupId.TRADITIONAL_BACKUP; |
| import static org.apache.solr.core.backup.BackupManager.ZK_STATE_DIR; |
| |
| /** |
| * Utility class for getting paths related to backups, or parsing information out of those paths. |
| */ |
| public class BackupFilePaths { |
| |
| private static final Pattern BACKUP_PROPS_ID_PTN = Pattern.compile("backup_([0-9]+).properties"); |
| private BackupRepository repository; |
| private URI backupLoc; |
| |
| /** |
| * Create a BackupFilePaths object. |
| * |
| * @param repository the repository; used primarily to resolve URIs. |
| * @param backupLoc the root location for a named backup. For traditional backups this is expected to take the form |
| * baseLocation/backupName. For incremental backups this is expected to be of the form |
| * baseLocation/backupName/collectionName. |
| */ |
| public BackupFilePaths(BackupRepository repository, URI backupLoc) { |
| this.repository = repository; |
| this.backupLoc = backupLoc; |
| } |
| |
| /** |
| * Return a URI for the 'index' location, responsible for holding index files for all backups at this location. |
| * |
| * Only valid for incremental backups. |
| */ |
| public URI getIndexDir() { |
| return repository.resolveDirectory(backupLoc, "index"); |
| } |
| |
| /** |
| * Return a URI for the 'shard_backup_metadata' location, which contains metadata files about each shard backup. |
| * |
| * Only valid for incremental backups. |
| */ |
| public URI getShardBackupMetadataDir() { |
| return repository.resolveDirectory(backupLoc, "shard_backup_metadata"); |
| } |
| |
| public URI getBackupLocation() { |
| return backupLoc; |
| } |
| |
| /** |
| * Create all locations required to store an incremental backup. |
| * |
| * @throws IOException for issues encountered using repository to create directories |
| */ |
| public void createIncrementalBackupFolders() throws IOException { |
| repository.createDirectory(backupLoc); |
| repository.createDirectory(getIndexDir()); |
| repository.createDirectory(getShardBackupMetadataDir()); |
| } |
| |
| /** |
| * Get the directory name used to hold backed up ZK state |
| * |
| * Valid for both incremental and traditional backups. |
| * |
| * @param id the ID of the backup in question |
| */ |
| public static String getZkStateDir(BackupId id) { |
| if (id.id == TRADITIONAL_BACKUP) { |
| return ZK_STATE_DIR; |
| } |
| return String.format(Locale.ROOT, "%s_%d", ZK_STATE_DIR, id.id); |
| } |
| |
| /** |
| * Get the filename of the top-level backup properties file |
| * |
| * Valid for both incremental and traditional backups. |
| * |
| * @param id the ID of the backup in question |
| */ |
| public static String getBackupPropsName(BackupId id) { |
| if (id.id == TRADITIONAL_BACKUP) { |
| return BackupManager.TRADITIONAL_BACKUP_PROPS_FILE; |
| } |
| return getBackupPropsName(id.id); |
| } |
| |
| /** |
| * Identify all strings which appear to be the filename of a top-level backup properties file. |
| * |
| * Only valid for incremental backups. |
| * |
| * @param listFiles a list of strings, filenames which may or may not correspond to backup properties files |
| */ |
| public static List<BackupId> findAllBackupIdsFromFileListing(String[] listFiles) { |
| List<BackupId> result = new ArrayList<>(); |
| for (String file: listFiles) { |
| Matcher m = BACKUP_PROPS_ID_PTN.matcher(file); |
| if (m.find()) { |
| result.add(new BackupId(Integer.parseInt(m.group(1)))); |
| } |
| } |
| |
| return result; |
| } |
| |
| /** |
| * Identify the string from an array of filenames which represents the most recent top-level backup properties file. |
| * |
| * Only valid for incremental backups. |
| * |
| * @param listFiles a list of strings, filenames which may or may not correspond to backup properties files. |
| */ |
| public static Optional<BackupId> findMostRecentBackupIdFromFileListing(String[] listFiles) { |
| return findAllBackupIdsFromFileListing(listFiles).stream().max(Comparator.comparingInt(o -> o.id)); |
| } |
| |
| /** |
| * Builds the URI for the backup location given the user-provided 'location' and backup 'name'. |
| * |
| * @param repository the backup repository, used to list files and resolve URI's. |
| * @param location a URI representing the repository location holding each backup name |
| * @param backupName the specific backup name to create a URI for |
| */ |
| public static URI buildExistingBackupLocationURI(BackupRepository repository, URI location, String backupName) throws IOException { |
| final URI backupNameUri = repository.resolveDirectory(location, backupName); |
| final String[] entries = repository.listAll(backupNameUri); |
| final boolean incremental = ! Arrays.stream(entries).anyMatch(entry -> entry.equals(BackupManager.TRADITIONAL_BACKUP_PROPS_FILE)); |
| if (incremental) { |
| // Incremental backups have an additional URI path component representing the collection that was backed up. |
| // This collection directory is the path assumed by other backup code. |
| if (entries.length != 1) { |
| throw new IllegalStateException("Incremental backup URI [" + backupNameUri + "] expected to hold a single directory. Number found: " + entries.length); |
| } |
| final String collectionName = entries[0]; |
| return repository.resolveDirectory(backupNameUri, entries[0]); |
| } else { |
| return backupNameUri; |
| } |
| } |
| |
| private static String getBackupPropsName(int id) { |
| return String.format(Locale.ROOT, "backup_%d.properties", id); |
| } |
| } |