/**
* 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.hdfs.server.namenode;
import java.io.IOException;
import java.io.PrintWriter;
import java.security.PrivilegedExceptionAction;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.ContentSummary;
import org.apache.hadoop.hdfs.protocol.ClientProtocol;
import org.apache.hadoop.ipc.RemoteException;
import org.apache.hadoop.security.UserGroupInformation;
import org.znerd.xmlenc.XMLOutputter;
/** Servlets for file checksum */
@InterfaceAudience.Private
public class ContentSummaryServlet extends DfsServlet {
/** For java.io.Serializable */
private static final long serialVersionUID = 1L;
/** {@inheritDoc} */
public void doGet(final HttpServletRequest request,
final HttpServletResponse response) throws ServletException, IOException {
final Configuration conf =
(Configuration) getServletContext().getAttribute("name.conf");
final UserGroupInformation ugi = getUGI(request, conf);
try {
ugi.doAs(new PrivilegedExceptionAction<Object>() {
@Override
public Object run() throws Exception {
final String path = request.getPathInfo();
final PrintWriter out = response.getWriter();
final XMLOutputter xml = new XMLOutputter(out, "UTF-8");
xml.declaration();
try {
//get content summary
final ClientProtocol nnproxy = createNameNodeProxy();
final ContentSummary cs = nnproxy.getContentSummary(path);
//write xml
xml.startTag(ContentSummary.class.getName());
if (cs != null) {
xml.attribute("length" , "" + cs.getLength());
xml.attribute("fileCount" , "" + cs.getFileCount());
xml.attribute("directoryCount", "" + cs.getDirectoryCount());
xml.attribute("quota" , "" + cs.getQuota());
xml.attribute("spaceConsumed" , "" + cs.getSpaceConsumed());
xml.attribute("spaceQuota" , "" + cs.getSpaceQuota());
}
xml.endTag();
} catch(IOException ioe) {
new RemoteException(ioe.getClass().getName(), ioe.getMessage()
).writeXml(path, xml);
}
xml.endDocument();
return null;
}
});
} catch (InterruptedException e) {
throw new IOException(e);
}
}
}