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    }