| /* |
| * 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.geode.internal.admin.remote; |
| |
| import java.io.DataInput; |
| import java.io.DataOutput; |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.RandomAccessFile; |
| |
| import org.apache.logging.log4j.Logger; |
| |
| import org.apache.geode.DataSerializer; |
| import org.apache.geode.distributed.internal.DistributionConfig; |
| import org.apache.geode.distributed.internal.DistributionManager; |
| import org.apache.geode.distributed.internal.InternalDistributedSystem; |
| import org.apache.geode.distributed.internal.membership.InternalDistributedMember; |
| import org.apache.geode.internal.serialization.DeserializationContext; |
| import org.apache.geode.internal.serialization.SerializationContext; |
| import org.apache.geode.logging.internal.log4j.api.LogService; |
| import org.apache.geode.logging.internal.spi.LogFile; |
| |
| public class TailLogResponse extends AdminResponse { |
| private static final Logger logger = LogService.getLogger(); |
| |
| private String tail; |
| private String childTail; |
| |
| public static TailLogResponse create(DistributionManager dm, |
| InternalDistributedMember recipient) { |
| TailLogResponse m = new TailLogResponse(); |
| m.setRecipient(recipient); |
| try { |
| InternalDistributedSystem sys = dm.getSystem(); |
| if (sys.getLogFile().isPresent()) { |
| LogFile logFile = sys.getLogFile().get(); |
| m.childTail = tailSystemLog(logFile.getChildLogFile()); |
| m.tail = tailSystemLog(sys.getConfig()); |
| if (m.tail == null) { |
| m.tail = |
| "No log file was specified in the configuration, messages will be directed to stdout."; |
| } |
| } else { |
| m.childTail = tailSystemLog((File) null); |
| m.tail = tailSystemLog(sys.getConfig()); |
| if (m.tail == null) { |
| m.tail = |
| "No log file was specified in the configuration, messages will be directed to stdout."; |
| } |
| } |
| } catch (IOException e) { |
| logger.warn("Error occurred while reading system log: {}", e.toString()); |
| m.tail = ""; |
| } |
| return m; |
| } |
| |
| @Override |
| public int getDSFID() { |
| return TAIL_LOG_RESPONSE; |
| } |
| |
| @Override |
| public void toData(DataOutput out, |
| SerializationContext context) throws IOException { |
| super.toData(out, context); |
| DataSerializer.writeString(tail, out); |
| DataSerializer.writeString(childTail, out); |
| } |
| |
| @Override |
| public void fromData(DataInput in, |
| DeserializationContext context) throws IOException, ClassNotFoundException { |
| super.fromData(in, context); |
| tail = DataSerializer.readString(in); |
| childTail = DataSerializer.readString(in); |
| } |
| |
| public String getTail() { |
| return tail; |
| } |
| |
| public String getChildTail() { |
| return childTail; |
| } |
| |
| @Override |
| public String toString() { |
| return "TailLogResponse from " + this.getRecipient() + " <TAIL>" + getTail() + "</TAIL>"; |
| } |
| |
| public static String tailSystemLog(File logFile) throws IOException { |
| if (logFile == null || logFile.equals(new File(""))) { |
| return null; |
| } |
| int numLines = 30; |
| int maxBuffer = 65500; // DataOutput.writeUTF will only accept 65535 bytes |
| long fileLength = logFile.length(); |
| byte[] buffer = (fileLength > maxBuffer) ? new byte[maxBuffer] : new byte[(int) fileLength]; |
| int readSize = buffer.length; |
| RandomAccessFile f = new RandomAccessFile(logFile, "r"); |
| f.seek(fileLength - readSize); |
| f.read(buffer, 0, readSize); |
| f.close(); |
| |
| String messageString = new String(buffer); |
| char[] text = messageString.toCharArray(); |
| for (int i = text.length - 1, j = 0; i >= 0; i--) { |
| if (text[i] == '[') |
| j++; |
| if (j == numLines) { |
| messageString = messageString.substring(i); |
| break; |
| } |
| } |
| return messageString.trim(); |
| } |
| |
| private static String tailSystemLog(DistributionConfig sc) throws IOException { |
| File logFile = sc.getLogFile(); |
| if (logFile == null || logFile.equals(new File(""))) { |
| return null; |
| } |
| if (!logFile.isAbsolute()) { |
| logFile = new File(logFile.getAbsolutePath()); |
| } |
| return tailSystemLog(logFile); |
| } |
| } |