| /* |
| * 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.twill.filesystem; |
| |
| import com.google.common.base.Objects; |
| import com.google.common.collect.ImmutableList; |
| import org.apache.hadoop.fs.CreateFlag; |
| import org.apache.hadoop.fs.FileAlreadyExistsException; |
| import org.apache.hadoop.fs.FileStatus; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Options; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.fs.permission.FsPermission; |
| import org.apache.hadoop.hdfs.DistributedFileSystem; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.net.URI; |
| import java.util.EnumSet; |
| import java.util.List; |
| import java.util.UUID; |
| |
| /** |
| * A concrete implementation of {@link Location} for the HDFS filesystem using {@link FileSystem}. |
| */ |
| final class HDFSLocation implements Location { |
| private final FileSystem fs; |
| private final Path path; |
| private final HDFSLocationFactory locationFactory; |
| |
| /** |
| * Constructs a HDFSLocation. |
| * |
| * @param locationFactory The {@link HDFSLocationFactory} that creates this instance. |
| * @param path of the file. |
| */ |
| HDFSLocation(HDFSLocationFactory locationFactory, Path path) { |
| this.fs = locationFactory.getFileSystem(); |
| this.path = path; |
| this.locationFactory = locationFactory; |
| } |
| |
| /** |
| * Checks if this location exists on HDFS. |
| * |
| * @return true if found; false otherwise. |
| * @throws IOException |
| */ |
| @Override |
| public boolean exists() throws IOException { |
| return fs.exists(path); |
| } |
| |
| /** |
| * @return An {@link InputStream} for this location on HDFS. |
| * @throws IOException |
| */ |
| @Override |
| public InputStream getInputStream() throws IOException { |
| return fs.open(path); |
| } |
| |
| /** |
| * @return An {@link OutputStream} for this location on HDFS. |
| * @throws IOException |
| */ |
| @Override |
| public OutputStream getOutputStream() throws IOException { |
| return fs.create(path); |
| } |
| |
| @Override |
| public OutputStream getOutputStream(String permission) throws IOException { |
| FsPermission fsPermission = parsePermissions(permission); |
| OutputStream os = fs.create(path, |
| fsPermission, |
| true, |
| fs.getConf().getInt("io.file.buffer.size", 4096), |
| fs.getDefaultReplication(path), |
| fs.getDefaultBlockSize(path), |
| null); |
| // Set the permission explicitly again to skip the umask |
| fs.setPermission(path, fsPermission); |
| return os; |
| } |
| |
| /** |
| * Appends the child to the current {@link Location} on HDFS. |
| * <p> |
| * Returns a new instance of Location. |
| * </p> |
| * |
| * @param child to be appended to this location. |
| * @return A new instance of {@link Location} |
| * @throws IOException |
| */ |
| @Override |
| public Location append(String child) throws IOException { |
| if (child.startsWith("/")) { |
| child = child.substring(1); |
| } |
| return new HDFSLocation(locationFactory, new Path(URI.create(path.toUri() + "/" + child))); |
| } |
| |
| @Override |
| public Location getTempFile(String suffix) throws IOException { |
| Path path = new Path( |
| URI.create(this.path.toUri() + "." + UUID.randomUUID() + (suffix == null ? TEMP_FILE_SUFFIX : suffix))); |
| return new HDFSLocation(locationFactory, path); |
| } |
| |
| /** |
| * @return Returns the name of the file or directory denoted by this abstract pathname. |
| */ |
| @Override |
| public String getName() { |
| return path.getName(); |
| } |
| |
| @Override |
| public boolean createNew() throws IOException { |
| return fs.createNewFile(path); |
| } |
| |
| @Override |
| public boolean createNew(String permission) throws IOException { |
| try { |
| FsPermission fsPermission = parsePermissions(permission); |
| fs.create(path, fsPermission, EnumSet.of(CreateFlag.CREATE), |
| fs.getConf().getInt("io.file.buffer.size", 4096), |
| fs.getDefaultReplication(path), |
| fs.getDefaultBlockSize(path), |
| null).close(); |
| // Set the permission explicitly again to skip the umask |
| fs.setPermission(path, fsPermission); |
| return true; |
| } catch (FileAlreadyExistsException e) { |
| return false; |
| } |
| } |
| |
| @Override |
| public String getOwner() throws IOException { |
| return fs.getFileStatus(path).getOwner(); |
| } |
| |
| @Override |
| public String getGroup() throws IOException { |
| return fs.getFileStatus(path).getGroup(); |
| } |
| |
| @Override |
| public void setGroup(String group) throws IOException { |
| fs.setOwner(path, null, group); |
| } |
| |
| @Override |
| public String getPermissions() throws IOException { |
| FsPermission permission = fs.getFileStatus(path).getPermission(); |
| return permission.getUserAction().SYMBOL + permission.getGroupAction().SYMBOL + permission.getOtherAction().SYMBOL; |
| } |
| |
| @Override |
| public void setPermissions(String permission) throws IOException { |
| fs.setPermission(path, parsePermissions(permission)); |
| } |
| |
| /** |
| * @return A {@link URI} for this location on HDFS. |
| */ |
| @Override |
| public URI toURI() { |
| return path.toUri(); |
| } |
| |
| /** |
| * Deletes the file or directory denoted by this abstract pathname. If this |
| * pathname denotes a directory, then the directory must be empty in order |
| * to be deleted. |
| * |
| * @return true if and only if the file or directory is successfully deleted; false otherwise. |
| */ |
| @Override |
| public boolean delete() throws IOException { |
| return fs.delete(path, false); |
| } |
| |
| @Override |
| public boolean delete(boolean recursive) throws IOException { |
| return fs.delete(path, true); |
| } |
| |
| @Override |
| public Location renameTo(Location destination) throws IOException { |
| // Destination will always be of the same type as this location. |
| if (fs instanceof DistributedFileSystem) { |
| ((DistributedFileSystem) fs).rename(path, ((HDFSLocation) destination).path, Options.Rename.OVERWRITE); |
| return new HDFSLocation(locationFactory, new Path(destination.toURI())); |
| } |
| |
| if (fs.rename(path, ((HDFSLocation) destination).path)) { |
| return new HDFSLocation(locationFactory, new Path(destination.toURI())); |
| } else { |
| return null; |
| } |
| } |
| |
| @Override |
| public boolean mkdirs() throws IOException { |
| if (fs.exists(path)) { |
| return false; |
| } |
| try { |
| return fs.mkdirs(path); |
| } catch (FileAlreadyExistsException e) { |
| return false; |
| } |
| } |
| |
| @Override |
| public boolean mkdirs(String permission) throws IOException { |
| return mkdirs(path, parsePermissions(permission)); |
| } |
| |
| /** |
| * Helper to create a directory and its parents id necessary, all with the given permissions. |
| * We cannot use the fs.mkdirs() because that would apply the umask to the permissions. |
| */ |
| private boolean mkdirs(Path path, FsPermission permission) throws IOException { |
| if (fs.exists(path)) { |
| return false; |
| } |
| Path parent = path.getParent(); |
| if (null == parent) { |
| return false; |
| } |
| // if parent exists, attempt to create the path as a directory. |
| if (fs.exists(parent)) { |
| return mkdir(path, permission); |
| } |
| // attempt to create the parent with the proper permissions |
| if (!mkdirs(parent, permission) && !fs.isDirectory(parent)) { |
| return false; |
| } |
| // now the parent exists and we can create this directory |
| return mkdir(path, permission); |
| } |
| |
| /** |
| * Helper to create a directory (but not its parents) with the given permissions. |
| * We cannot use fs.mkdirs() and then apply the permissions to override the umask. |
| */ |
| private boolean mkdir(Path path, FsPermission permission) throws IOException { |
| try { |
| if (!fs.mkdirs(path) && !fs.isDirectory(path)) { |
| return false; |
| } |
| } catch (FileAlreadyExistsException e) { |
| return false; |
| } |
| // explicitly set permissions to get around the umask |
| fs.setPermission(path, permission); |
| return true; |
| } |
| |
| /** |
| * @return Length of file. |
| */ |
| @Override |
| public long length() throws IOException { |
| return fs.getFileStatus(path).getLen(); |
| } |
| |
| @Override |
| public long lastModified() throws IOException { |
| return fs.getFileStatus(path).getModificationTime(); |
| } |
| |
| @Override |
| public boolean isDirectory() throws IOException { |
| return fs.isDirectory(path); |
| } |
| |
| @Override |
| public List<Location> list() throws IOException { |
| FileStatus[] statuses = fs.listStatus(path); |
| ImmutableList.Builder<Location> result = ImmutableList.builder(); |
| if (statuses != null) { |
| for (FileStatus status : statuses) { |
| if (!Objects.equal(path, status.getPath())) { |
| result.add(new HDFSLocation(locationFactory, status.getPath())); |
| } |
| } |
| } |
| return result.build(); |
| } |
| |
| @Override |
| public LocationFactory getLocationFactory() { |
| return locationFactory; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| |
| HDFSLocation other = (HDFSLocation) o; |
| return Objects.equal(path, other.path); |
| } |
| |
| @Override |
| public int hashCode() { |
| return path.hashCode(); |
| } |
| |
| @Override |
| public String toString() { |
| return path.toString(); |
| } |
| |
| /** |
| * Parses the given permission to {@link FsPermission}. Since the {@link HDFSLocationFactory} and this class are |
| * deprecated, this method is copied from {@link FileContextLocation} instead of creating an extra library to share. |
| * |
| * @param permission the permission as passed to the {@link #createNew(String)} or {@link #getOutputStream(String)} |
| * methods. |
| * @return a new {@link FsPermission}. |
| */ |
| private FsPermission parsePermissions(String permission) { |
| if (permission.length() == 3) { |
| return new FsPermission(permission); |
| } else if (permission.length() == 9) { |
| // The FsPermission expect a 10 characters string, which it will ignore the first character |
| return FsPermission.valueOf("-" + permission); |
| } else { |
| throw new IllegalArgumentException("Invalid permission " + permission + |
| ". Permission should either be a three digit or nine character string."); |
| } |
| } |
| } |