| /* |
| * 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.hdds.server.http; |
| |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import java.io.IOException; |
| |
| import org.apache.log4j.Level; |
| import org.apache.log4j.Logger; |
| import org.apache.log4j.PatternLayout; |
| import org.apache.log4j.WriterAppender; |
| |
| /** |
| * Servlet to stream the current logs to the response. |
| */ |
| public class LogStreamServlet extends HttpServlet { |
| |
| private static final String PATTERN = "%d [%p|%c|%C{1}] %m%n"; |
| |
| @Override |
| protected void doGet(HttpServletRequest req, HttpServletResponse resp) |
| throws IOException { |
| |
| WriterAppender appender = |
| new WriterAppender(new PatternLayout(PATTERN), resp.getWriter()); |
| appender.setThreshold(Level.TRACE); |
| |
| try { |
| Logger.getRootLogger().addAppender(appender); |
| try { |
| Thread.sleep(Integer.MAX_VALUE); |
| } catch (InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| } |
| } finally { |
| Logger.getRootLogger().removeAppender(appender); |
| } |
| } |
| |
| } |