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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 java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URI;
import java.net.URISyntaxException;
import org.apache.http.HttpEntity;
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.entity.ContentType;
import org.apache.http.entity.InputStreamEntity;
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 /{actioncache,cas}/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 /{actioncache,cas}/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 /{actioncache,cas}/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 static final String ACTION_CACHE_PREFIX = "ac";
private static final String CAS_PREFIX = "cas";
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) throws IOException {
validateUrl(baseUrl);
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 {
return get(CAS_PREFIX, key, out);
}
@Override
public boolean getActionResult(String key, OutputStream out)
throws IOException, InterruptedException {
return get(ACTION_CACHE_PREFIX, key, out);
}
private boolean get(String urlPrefix, String key, OutputStream out) throws IOException {
HttpClient client = clientFactory.build();
HttpGet get = new HttpGet(baseUrl + "/" + urlPrefix + "/" + 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, long length, InputStream in) throws IOException {
put(CAS_PREFIX, key, new InputStreamEntity(in, length, ContentType.APPLICATION_OCTET_STREAM));
}
@Override
public void putActionResult(String key, byte[] in) throws IOException, InterruptedException {
put(ACTION_CACHE_PREFIX, key, new ByteArrayEntity(in, ContentType.APPLICATION_OCTET_STREAM));
}
private void put(String urlPrefix, String key, HttpEntity entity) throws IOException {
HttpClient client = clientFactory.build();
HttpPut put = new HttpPut(baseUrl + "/" + urlPrefix + "/" + key);
put.setEntity(entity);
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;
});
}
private void validateUrl(String url) throws IOException {
try {
new URI(url);
} catch (URISyntaxException e) {
throw new IOException("Failed to parse remote REST cache URL: " + baseUrl, e);
}
}
}
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