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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements. See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache license, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License. You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the license for the specific language governing permissions and
    15   * limitations under the license.
    16   */
    17  package org.apache.logging.log4j.core.net.server;
    18
    19  import java.io.InputStream;
    20  import java.nio.charset.Charset;
    21
    22  import org.apache.logging.log4j.core.LogEvent;
    23  import org.apache.logging.log4j.core.jackson.Log4jJsonObjectMapper;
    24  import org.apache.logging.log4j.util.Chars;
    25
    26  /**
    27   * Reads and logs JSON {@link LogEvent}s from an {@link InputStream}..
    28   */
    29  public class JsonInputStreamLogEventBridge extends InputStreamLogEventBridge {
    30
    31      private static final int[] END_PAIR = new int[] { END, END };
    32      private static final char EVENT_END_MARKER = '}';
    33      private static final char EVENT_START_MARKER = '{';
    34      private static final char JSON_ESC = '\\';
    35      private static final char JSON_STR_DELIM = Chars.DQUOTE;
    36
    37      public JsonInputStreamLogEventBridge() {
    38          this(1024, Charset.defaultCharset());
    39      }
    40
    41      public JsonInputStreamLogEventBridge(final int bufferSize, final Charset charset) {
    42          super(new Log4jJsonObjectMapper(), bufferSize, charset, String.valueOf(EVENT_END_MARKER));
    43      }
    44
    45      @Override
    46      protected int[] getEventIndices(final String text, final int beginIndex) {
    47          // Scan the text for the end of the next JSON object.
    48          final int start = text.indexOf(EVENT_START_MARKER, beginIndex);
    49          if (start == END) {
    50              return END_PAIR;
    51          }
    52          final char[] charArray = text.toCharArray();
    53          int stack = 0;
    54          boolean inStr = false;
    55          boolean inEsc = false;
    56          for (int i = start; i < charArray.length; i++) {
    57              final char c = charArray[i];
    58              if (!inEsc) {
    59                  inEsc = false;
    60                  switch (c) {
    61                  case EVENT_START_MARKER:
    62                      if (!inStr) {
    63                          stack++;
    64                      }
    65                      break;
    66                  case EVENT_END_MARKER:
    67                      if (!inStr) {
    68                          stack--;
    69                      }
    70                      break;
    71                  case JSON_STR_DELIM:
    72                      inStr = !inStr;
    73                      break;
    74                  case JSON_ESC:
    75                      inEsc = true;
    76                      break;
    77                  }
    78                  if (stack == 0) {
    79                      return new int[] { start, i };
    80                  }
    81              }
    82          }
    83          return END_PAIR;
    84      }
    85
    86  }