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    
025    /**
026     * Reads and logs JSON {@link LogEvent}s from an {@link InputStream}..
027     */
028    public class JsonInputStreamLogEventBridge extends InputStreamLogEventBridge {
029    
030        private static final int[] END_PAIR = new int[] { END, END };
031        private static final char EVENT_END_MARKER = '}';
032        private static final char EVENT_START_MARKER = '{';
033        private static final char JSON_ESC = '\\';
034        private static final char JSON_STR_DELIM = '"';
035    
036        public JsonInputStreamLogEventBridge() {
037            this(1024, Charset.defaultCharset());
038        }
039    
040        public JsonInputStreamLogEventBridge(final int bufferSize, final Charset charset) {
041            super(new Log4jJsonObjectMapper(), bufferSize, charset, String.valueOf(EVENT_END_MARKER));
042        }
043    
044        @Override
045        protected int[] getEventIndices(final String text, final int beginIndex) {
046            // Scan the text for the end of the next JSON object.
047            final int start = text.indexOf(EVENT_START_MARKER, beginIndex);
048            if (start == END) {
049                return END_PAIR;
050            }
051            final char[] charArray = text.toCharArray();
052            int stack = 0;
053            boolean inStr = false;
054            boolean inEsc = false;
055            for (int i = start; i < charArray.length; i++) {
056                final char c = charArray[i];
057                if (!inEsc) {
058                    inEsc = false;
059                    switch (c) {
060                    case EVENT_START_MARKER:
061                        if (!inStr) {
062                            stack++;
063                        }
064                        break;
065                    case EVENT_END_MARKER:
066                        if (!inStr) {
067                            stack--;
068                        }
069                        break;
070                    case JSON_STR_DELIM:
071                        inStr = !inStr;
072                        break;
073                    case JSON_ESC:
074                        inEsc = true;
075                        break;
076                    }
077                    if (stack == 0) {
078                        return new int[] { start, i };
079                    }
080                }
081            }
082            return END_PAIR;
083        }
084    
085    }