001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache license, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the license for the specific language governing permissions and
015 * limitations under the license.
016 */
017 package org.apache.logging.log4j.core.net.server;
018
019 import java.io.InputStream;
020 import java.nio.charset.Charset;
021
022 import org.apache.logging.log4j.core.LogEvent;
023 import org.apache.logging.log4j.core.jackson.Log4jJsonObjectMapper;
024 import org.apache.logging.log4j.util.Chars;
025
026 /**
027 * Reads and logs JSON {@link LogEvent}s from an {@link InputStream}..
028 */
029 public class JsonInputStreamLogEventBridge extends InputStreamLogEventBridge {
030
031 private static final int[] END_PAIR = new int[] { END, END };
032 private static final char EVENT_END_MARKER = '}';
033 private static final char EVENT_START_MARKER = '{';
034 private static final char JSON_ESC = '\\';
035 private static final char JSON_STR_DELIM = Chars.DQUOTE;
036
037 public JsonInputStreamLogEventBridge() {
038 this(1024, Charset.defaultCharset());
039 }
040
041 public JsonInputStreamLogEventBridge(final int bufferSize, final Charset charset) {
042 super(new Log4jJsonObjectMapper(), bufferSize, charset, String.valueOf(EVENT_END_MARKER));
043 }
044
045 @Override
046 protected int[] getEventIndices(final String text, final int beginIndex) {
047 // Scan the text for the end of the next JSON object.
048 final int start = text.indexOf(EVENT_START_MARKER, beginIndex);
049 if (start == END) {
050 return END_PAIR;
051 }
052 final char[] charArray = text.toCharArray();
053 int stack = 0;
054 boolean inStr = false;
055 boolean inEsc = false;
056 for (int i = start; i < charArray.length; i++) {
057 final char c = charArray[i];
058 if (!inEsc) {
059 inEsc = false;
060 switch (c) {
061 case EVENT_START_MARKER:
062 if (!inStr) {
063 stack++;
064 }
065 break;
066 case EVENT_END_MARKER:
067 if (!inStr) {
068 stack--;
069 }
070 break;
071 case JSON_STR_DELIM:
072 inStr = !inStr;
073 break;
074 case JSON_ESC:
075 inEsc = true;
076 break;
077 }
078 if (stack == 0) {
079 return new int[] { start, i };
080 }
081 }
082 }
083 return END_PAIR;
084 }
085
086 }