/**
* 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.hadoop.fs.s3;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.s3.INode.FileType;
import org.jets3t.service.S3Service;
import org.jets3t.service.S3ServiceException;
import org.jets3t.service.impl.rest.httpclient.RestS3Service;
import org.jets3t.service.model.S3Bucket;
import org.jets3t.service.model.S3Object;
import org.jets3t.service.security.AWSCredentials;
class Jets3tFileSystemStore implements FileSystemStore {
private static final String FILE_SYSTEM_NAME = "fs";
private static final String FILE_SYSTEM_VALUE = "Hadoop";
private static final String FILE_SYSTEM_TYPE_NAME = "fs-type";
private static final String FILE_SYSTEM_TYPE_VALUE = "block";
private static final String FILE_SYSTEM_VERSION_NAME = "fs-version";
private static final String FILE_SYSTEM_VERSION_VALUE = "1";
private static final Map<String, String> METADATA =
new HashMap<String, String>();
static {
METADATA.put(FILE_SYSTEM_NAME, FILE_SYSTEM_VALUE);
METADATA.put(FILE_SYSTEM_TYPE_NAME, FILE_SYSTEM_TYPE_VALUE);
METADATA.put(FILE_SYSTEM_VERSION_NAME, FILE_SYSTEM_VERSION_VALUE);
}
private static final String PATH_DELIMITER = Path.SEPARATOR;
private static final String BLOCK_PREFIX = "block_";
private Configuration conf;
private S3Service s3Service;
private S3Bucket bucket;
private int bufferSize;
public void initialize(URI uri, Configuration conf) throws IOException {
this.conf = conf;
S3Credentials s3Credentials = new S3Credentials();
s3Credentials.initialize(uri, conf);
try {
AWSCredentials awsCredentials =
new AWSCredentials(s3Credentials.getAccessKey(),
s3Credentials.getSecretAccessKey());
this.s3Service = new RestS3Service(awsCredentials);
} catch (S3ServiceException e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
}
throw new S3Exception(e);
}
bucket = new S3Bucket(uri.getHost());
this.bufferSize = conf.getInt("io.file.buffer.size", 4096);
}
public String getVersion() throws IOException {
return FILE_SYSTEM_VERSION_VALUE;
}
private void delete(String key) throws IOException {
try {
s3Service.deleteObject(bucket, key);
} catch (S3ServiceException e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
}
throw new S3Exception(e);
}
}
public void deleteINode(Path path) throws IOException {
delete(pathToKey(path));
}
public void deleteBlock(Block block) throws IOException {
delete(blockToKey(block));
}
public boolean inodeExists(Path path) throws IOException {
InputStream in = get(pathToKey(path), true);
if (in == null) {
return false;
}
in.close();
return true;
}
public boolean blockExists(long blockId) throws IOException {
InputStream in = get(blockToKey(blockId), false);
if (in == null) {
return false;
}
in.close();
return true;
}
private InputStream get(String key, boolean checkMetadata)
throws IOException {
try {
S3Object object = s3Service.getObject(bucket, key);
if (checkMetadata) {
checkMetadata(object);
}
return object.getDataInputStream();
} catch (S3ServiceException e) {
if ("NoSuchKey".equals(e.getS3ErrorCode())) {
return null;
}
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
}
throw new S3Exception(e);
}
}
private InputStream get(String key, long byteRangeStart) throws IOException {
try {
S3Object object = s3Service.getObject(bucket, key, null, null, null,
null, byteRangeStart, null);
return object.getDataInputStream();
} catch (S3ServiceException e) {
if ("NoSuchKey".equals(e.getS3ErrorCode())) {
return null;
}
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
}
throw new S3Exception(e);
}
}
private void checkMetadata(S3Object object) throws S3FileSystemException,
S3ServiceException {
String name = (String) object.getMetadata(FILE_SYSTEM_NAME);
if (!FILE_SYSTEM_VALUE.equals(name)) {
throw new S3FileSystemException("Not a Hadoop S3 file.");
}
String type = (String) object.getMetadata(FILE_SYSTEM_TYPE_NAME);
if (!FILE_SYSTEM_TYPE_VALUE.equals(type)) {
throw new S3FileSystemException("Not a block file.");
}
String dataVersion = (String) object.getMetadata(FILE_SYSTEM_VERSION_NAME);
if (!FILE_SYSTEM_VERSION_VALUE.equals(dataVersion)) {
throw new VersionMismatchException(FILE_SYSTEM_VERSION_VALUE,
dataVersion);
}
}
public INode retrieveINode(Path path) throws IOException {
return INode.deserialize(get(pathToKey(path), true));
}
public File retrieveBlock(Block block, long byteRangeStart)
throws IOException {
File fileBlock = null;
InputStream in = null;
OutputStream out = null;
try {
fileBlock = newBackupFile();
in = get(blockToKey(block), byteRangeStart);
out = new BufferedOutputStream(new FileOutputStream(fileBlock));
byte[] buf = new byte[bufferSize];
int numRead;
while ((numRead = in.read(buf)) >= 0) {
out.write(buf, 0, numRead);
}
return fileBlock;
} catch (IOException e) {
// close output stream to file then delete file
closeQuietly(out);
out = null; // to prevent a second close
if (fileBlock != null) {
fileBlock.delete();
}
throw e;
} finally {
closeQuietly(out);
closeQuietly(in);
}
}
private File newBackupFile() throws IOException {
File dir = new File(conf.get("fs.s3.buffer.dir"));
if (!dir.exists() && !dir.mkdirs()) {
throw new IOException("Cannot create S3 buffer directory: " + dir);
}
File result = File.createTempFile("input-", ".tmp", dir);
result.deleteOnExit();
return result;
}
public Set<Path> listSubPaths(Path path) throws IOException {
try {
String prefix = pathToKey(path);
if (!prefix.endsWith(PATH_DELIMITER)) {
prefix += PATH_DELIMITER;
}
S3Object[] objects = s3Service.listObjects(bucket, prefix, PATH_DELIMITER);
Set<Path> prefixes = new TreeSet<Path>();
for (int i = 0; i < objects.length; i++) {
prefixes.add(keyToPath(objects[i].getKey()));
}
prefixes.remove(path);
return prefixes;
} catch (S3ServiceException e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
}
throw new S3Exception(e);
}
}
public Set<Path> listDeepSubPaths(Path path) throws IOException {
try {
String prefix = pathToKey(path);
if (!prefix.endsWith(PATH_DELIMITER)) {
prefix += PATH_DELIMITER;
}
S3Object[] objects = s3Service.listObjects(bucket, prefix, null);
Set<Path> prefixes = new TreeSet<Path>();
for (int i = 0; i < objects.length; i++) {
prefixes.add(keyToPath(objects[i].getKey()));
}
prefixes.remove(path);
return prefixes;
} catch (S3ServiceException e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
}
throw new S3Exception(e);
}
}
private void put(String key, InputStream in, long length, boolean storeMetadata)
throws IOException {
try {
S3Object object = new S3Object(key);
object.setDataInputStream(in);
object.setContentType("binary/octet-stream");
object.setContentLength(length);
if (storeMetadata) {
object.addAllMetadata(METADATA);
}
s3Service.putObject(bucket, object);
} catch (S3ServiceException e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
}
throw new S3Exception(e);
}
}
public void storeINode(Path path, INode inode) throws IOException {
put(pathToKey(path), inode.serialize(), inode.getSerializedLength(), true);
}
public void storeBlock(Block block, File file) throws IOException {
BufferedInputStream in = null;
try {
in = new BufferedInputStream(new FileInputStream(file));
put(blockToKey(block), in, block.getLength(), false);
} finally {
closeQuietly(in);
}
}
private void closeQuietly(Closeable closeable) {
if (closeable != null) {
try {
closeable.close();
} catch (IOException e) {
// ignore
}
}
}
private String pathToKey(Path path) {
if (!path.isAbsolute()) {
throw new IllegalArgumentException("Path must be absolute: " + path);
}
return path.toUri().getPath();
}
private Path keyToPath(String key) {
return new Path(key);
}
private String blockToKey(long blockId) {
return BLOCK_PREFIX + blockId;
}
private String blockToKey(Block block) {
return blockToKey(block.getId());
}
public void purge() throws IOException {
try {
S3Object[] objects = s3Service.listObjects(bucket);
for (int i = 0; i < objects.length; i++) {
s3Service.deleteObject(bucket, objects[i].getKey());
}
} catch (S3ServiceException e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
}
throw new S3Exception(e);
}
}
public void dump() throws IOException {
StringBuilder sb = new StringBuilder("S3 Filesystem, ");
sb.append(bucket.getName()).append("\n");
try {
S3Object[] objects = s3Service.listObjects(bucket, PATH_DELIMITER, null);
for (int i = 0; i < objects.length; i++) {
Path path = keyToPath(objects[i].getKey());
sb.append(path).append("\n");
INode m = retrieveINode(path);
sb.append("\t").append(m.getFileType()).append("\n");
if (m.getFileType() == FileType.DIRECTORY) {
continue;
}
for (int j = 0; j < m.getBlocks().length; j++) {
sb.append("\t").append(m.getBlocks()[j]).append("\n");
}
}
} catch (S3ServiceException e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
}
throw new S3Exception(e);
}
System.out.println(sb);
}
}