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// Copyright 2017 The Bazel Authors. All rights reserved.
//
// Licensed 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 com.google.devtools.build.lib.remote.blobstore;
import com.google.common.io.ByteStreams;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpHead;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
/**
* Implementation of {@link SimpleBlobStore} with a REST service. The REST service needs to
* support the following HTTP methods.
*
* <p>PUT /cache/1234 HTTP/1.1 PUT method is used to upload a blob with a base16 key. In this
* example the key is 1234. Valid status codes are 200, 201, 202 and 204.
*
* <p>GET /cache/1234 HTTP/1.1 GET method fetches a blob with the specified key. In this example
* the key is 1234. A status code of 200 should be followed by the content of blob. Status code of
* 404 or 204 means the key cannot be found.
*
* <p>HEAD /cache/1234 HTTP/1.1 HEAD method checks to see if the specified key exists in the blob
* store. A status code of 200 indicates the key is found in the blob store. A status code of 404
* indicates the key is not found in the blob store.
*/
public final class RestBlobStore implements SimpleBlobStore {
private final String baseUrl;
private final PoolingHttpClientConnectionManager connMan;
private final HttpClientBuilder clientFactory;
/**
* Creates a new instance.
*
* @param baseUrl base URL for the remote cache
* @param poolSize maximum number of simultaneous connections
*/
public RestBlobStore(String baseUrl, int poolSize) {
this.baseUrl = baseUrl;
connMan = new PoolingHttpClientConnectionManager();
connMan.setDefaultMaxPerRoute(poolSize);
connMan.setMaxTotal(poolSize);
clientFactory = HttpClientBuilder.create();
clientFactory.setConnectionManager(connMan);
clientFactory.setConnectionManagerShared(true);
}
@Override
public void close() {
connMan.close();
}
@Override
public boolean containsKey(String key) throws IOException {
HttpClient client = clientFactory.build();
HttpHead head = new HttpHead(baseUrl + "/" + key);
return client.execute(
head,
response -> {
int statusCode = response.getStatusLine().getStatusCode();
return HttpStatus.SC_OK == statusCode;
});
}
@Override
public boolean get(String key, OutputStream out) throws IOException {
HttpClient client = clientFactory.build();
HttpGet get = new HttpGet(baseUrl + "/" + key);
return client.execute(
get,
response -> {
int statusCode = response.getStatusLine().getStatusCode();
if (HttpStatus.SC_NOT_FOUND == statusCode
|| HttpStatus.SC_NO_CONTENT == statusCode) {
return false;
}
if (HttpStatus.SC_OK != statusCode) {
throw new IOException("GET failed with status code " + statusCode);
}
response.getEntity().writeTo(out);
return true;
});
}
@Override
public void put(String key, InputStream in) throws IOException {
HttpClient client = clientFactory.build();
HttpPut put = new HttpPut(baseUrl + "/" + key);
// For now, upload a byte array instead of a stream, due to Hazelcast crashing on the stream.
// See https://github.com/hazelcast/hazelcast/issues/10878.
put.setEntity(new ByteArrayEntity(ByteStreams.toByteArray(in)));
put.setHeader("Content-Type", "application/octet-stream");
client.execute(
put,
(response) -> {
int statusCode = response.getStatusLine().getStatusCode();
// Accept more than SC_OK to be compatible with Nginx WebDav module.
if (HttpStatus.SC_OK != statusCode
&& HttpStatus.SC_ACCEPTED != statusCode
&& HttpStatus.SC_CREATED != statusCode
&& HttpStatus.SC_NO_CONTENT != statusCode) {
throw new IOException("PUT failed with status code " + statusCode);
}
return null;
});
}
}
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