/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.elasticsearch.cloud.aws.blobstore;
import com.amazonaws.services.s3.model.ObjectListing;
import com.amazonaws.services.s3.model.S3Object;
import com.amazonaws.services.s3.model.S3ObjectSummary;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.blobstore.BlobMetaData;
import org.elasticsearch.common.blobstore.BlobPath;
import org.elasticsearch.common.blobstore.support.AbstractBlobContainer;
import org.elasticsearch.common.blobstore.support.PlainBlobMetaData;
import org.elasticsearch.common.collect.ImmutableMap;
import java.io.IOException;
import java.io.InputStream;
/**
* @author kimchy (shay.banon)
*/
public class AbstractS3BlobContainer extends AbstractBlobContainer {
protected final S3BlobStore blobStore;
protected final String keyPath;
public AbstractS3BlobContainer(BlobPath path, S3BlobStore blobStore) {
super(path);
this.blobStore = blobStore;
this.keyPath = path.buildAsString("/") + "/";
}
@Override public boolean blobExists(String blobName) {
try {
blobStore.client().getObjectMetadata(blobStore.bucket(), buildKey(blobName));
return true;
} catch (Exception e) {
return false;
}
}
@Override public boolean deleteBlob(String blobName) throws IOException {
blobStore.client().deleteObject(blobStore.bucket(), buildKey(blobName));
return true;
}
@Override public void readBlob(final String blobName, final ReadBlobListener listener) {
blobStore.executor().execute(new Runnable() {
@Override public void run() {
InputStream is;
try {
S3Object object = blobStore.client().getObject(blobStore.bucket(), buildKey(blobName));
is = object.getObjectContent();
} catch (Exception e) {
listener.onFailure(e);
return;
}
byte[] buffer = new byte[blobStore.bufferSizeInBytes()];
try {
int bytesRead;
while ((bytesRead = is.read(buffer)) != -1) {
listener.onPartial(buffer, 0, bytesRead);
}
listener.onCompleted();
} catch (Exception e) {
try {
is.close();
} catch (IOException e1) {
// ignore
}
listener.onFailure(e);
}
}
});
}
@Override public ImmutableMap<String, BlobMetaData> listBlobsByPrefix(@Nullable String blobNamePrefix) throws IOException {
ImmutableMap.Builder<String, BlobMetaData> blobsBuilder = ImmutableMap.builder();
ObjectListing prevListing = null;
while (true) {
ObjectListing list;
if (prevListing != null) {
list = blobStore.client().listNextBatchOfObjects(prevListing);
} else {
if (blobNamePrefix != null) {
list = blobStore.client().listObjects(blobStore.bucket(), buildKey(blobNamePrefix));
} else {
list = blobStore.client().listObjects(blobStore.bucket(), keyPath);
}
}
for (S3ObjectSummary summary : list.getObjectSummaries()) {
String name = summary.getKey().substring(keyPath.length());
blobsBuilder.put(name, new PlainBlobMetaData(name, summary.getSize()));
}
if (list.isTruncated()) {
prevListing = list;
} else {
break;
}
}
return blobsBuilder.build();
}
@Override public ImmutableMap<String, BlobMetaData> listBlobs() throws IOException {
return listBlobsByPrefix(null);
}
protected String buildKey(String blobName) {
return keyPath + blobName;
}
}