package org.apache.hadoop.fs.s3;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URLDecoder;
import java.net.URLEncoder;
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 PATH_DELIMITER = urlEncode(Path.SEPARATOR);
private static final String BLOCK_PREFIX = "block_";
private S3Service s3Service;
private S3Bucket bucket;
public void initialize(URI uri, Configuration conf) throws IOException {
try {
String accessKey = null;
String secretAccessKey = null;
String userInfo = uri.getUserInfo();
if (userInfo != null) {
int index = userInfo.indexOf(':');
if (index != -1) {
accessKey = userInfo.substring(0, index);
secretAccessKey = userInfo.substring(index + 1);
} else {
accessKey = userInfo;
}
}
if (accessKey == null) {
accessKey = conf.get("fs.s3.awsAccessKeyId");
}
if (secretAccessKey == null) {
secretAccessKey = conf.get("fs.s3.awsSecretAccessKey");
}
if (accessKey == null && secretAccessKey == null) {
throw new IllegalArgumentException("AWS " +
"Access Key ID and Secret Access Key " +
"must be specified as the username " +
"or password (respectively) of a s3 URL, " +
"or by setting the " +
"fs.s3.awsAccessKeyId or " +
"fs.s3.awsSecretAccessKey properties (respectively).");
} else if (accessKey == null) {
throw new IllegalArgumentException("AWS " +
"Access Key ID must be specified " +
"as the username of a s3 URL, or by setting the " +
"fs.s3.awsAccessKeyId property.");
} else if (secretAccessKey == null) {
throw new IllegalArgumentException("AWS " +
"Secret Access Key must be specified " +
"as the password of a s3 URL, or by setting the " +
"fs.s3.awsSecretAccessKey property.");
}
AWSCredentials awsCredentials = new AWSCredentials(accessKey, secretAccessKey);
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());
createBucket(bucket.getName());
}
private void createBucket(String bucketName) throws IOException {
try {
s3Service.createBucket(bucketName);
} catch (S3ServiceException e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
}
throw new S3Exception(e);
}
}
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));
if (in == null) {
return false;
}
in.close();
return true;
}
public boolean blockExists(long blockId) throws IOException {
InputStream in = get(blockToKey(blockId));
if (in == null) {
return false;
}
in.close();
return true;
}
private InputStream get(String key) throws IOException {
try {
S3Object object = s3Service.getObject(bucket, key);
return object.getDataInputStream();
} catch (S3ServiceException e) {
if (e.getErrorCode().equals("NoSuchKey")) {
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 (e.getErrorCode().equals("NoSuchKey")) {
return null;
}
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
}
throw new S3Exception(e);
}
}
public INode getINode(Path path) throws IOException {
return INode.deserialize(get(pathToKey(path)));
}
public InputStream getBlockStream(Block block, long byteRangeStart)
throws IOException {
return get(blockToKey(block), byteRangeStart);
}
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, 0);
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) throws IOException {
try {
S3Object object = new S3Object(key);
object.setDataInputStream(in);
object.setContentType("binary/octet-stream");
object.setContentLength(length);
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());
}
public void storeBlock(Block block, InputStream in) throws IOException {
put(blockToKey(block), in, block.getLength());
}
private String pathToKey(Path path) {
if (!path.isAbsolute()) {
throw new IllegalArgumentException("Path must be absolute: " + path);
}
return urlEncode(path.toUri().getPath());
}
private Path keyToPath(String key) {
return new Path(urlDecode(key));
}
private static String urlEncode(String s) {
try {
return URLEncoder.encode(s, "UTF-8");
} catch (UnsupportedEncodingException e) {
// Should never happen since every implementation of the Java Platform
// is required to support UTF-8.
// See http://java.sun.com/j2se/1.5.0/docs/api/java/nio/charset/Charset.html
throw new IllegalStateException(e);
}
}
private static String urlDecode(String s) {
try {
return URLDecoder.decode(s, "UTF-8");
} catch (UnsupportedEncodingException e) {
// Should never happen since every implementation of the Java Platform
// is required to support UTF-8.
// See http://java.sun.com/j2se/1.5.0/docs/api/java/nio/charset/Charset.html
throw new IllegalStateException(e);
}
}
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 = getINode(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);
}
}