    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    }