/**
* 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.yarn.server.resourcemanager.webapp;
import java.io.IOException;
import java.io.PrintWriter;
import javax.inject.Inject;
import javax.inject.Singleton;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.hadoop.http.HtmlQuoting;
import com.google.inject.Injector;
import com.sun.jersey.guice.spi.container.servlet.GuiceContainer;
@Singleton
public class RMWebAppFilter extends GuiceContainer {
private Injector injector;
/**
*
*/
private static final long serialVersionUID = 1L;
@Inject
public RMWebAppFilter(Injector injector) {
super(injector);
this.injector=injector;
}
@Override
public void doFilter(HttpServletRequest request,
HttpServletResponse response, FilterChain chain) throws IOException,
ServletException {
response.setCharacterEncoding("UTF-8");
String uri = HtmlQuoting.quoteHtmlChars(request.getRequestURI());
if (uri == null) {
uri = "/";
}
RMWebApp rmWebApp = injector.getInstance(RMWebApp.class);
rmWebApp.checkIfStandbyRM();
if (rmWebApp.isStandby()
&& !uri.equals("/" + rmWebApp.wsName() + "/v1/cluster/info")
&& !uri.equals("/" + rmWebApp.name() + "/cluster")) {
String redirectPath = rmWebApp.getRedirectPath() + uri;
if (redirectPath != null && !redirectPath.isEmpty()) {
String redirectMsg =
"This is standby RM. Redirecting to the current active RM: "
+ redirectPath;
response.addHeader("Refresh", "3; url=" + redirectPath);
PrintWriter out = response.getWriter();
out.println(redirectMsg);
return;
}
}
super.doFilter(request, response, chain);
}
}