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.IOException;
020 import java.io.InputStream;
021 import java.nio.charset.Charset;
022
023 import org.apache.logging.log4j.core.LogEvent;
024 import org.apache.logging.log4j.core.LogEventListener;
025 import org.apache.logging.log4j.core.impl.Log4jLogEvent;
026 import org.apache.logging.log4j.util.Strings;
027
028 import com.fasterxml.jackson.databind.ObjectMapper;
029 import com.fasterxml.jackson.databind.ObjectReader;
030
031 /**
032 * Reads and logs {@link LogEvent}s from an {@link InputStream}.
033 */
034 public abstract class InputStreamLogEventBridge extends AbstractLogEventBridge<InputStream> {
035
036 private final int bufferSize;
037
038 private final Charset charset;
039
040 private final String eventEndMarker;
041
042 private final ObjectReader objectReader;
043
044 public InputStreamLogEventBridge(final ObjectMapper mapper, final int bufferSize, final Charset charset, final String eventEndMarker) {
045 this.bufferSize = bufferSize;
046 this.charset = charset;
047 this.eventEndMarker = eventEndMarker;
048 this.objectReader = mapper.reader(Log4jLogEvent.class);
049 }
050
051 abstract protected int[] getEventIndices(final String text, int beginIndex);
052
053 @Override
054 public void logEvents(final InputStream inputStream, final LogEventListener logEventListener) throws IOException {
055 String workingText = Strings.EMPTY;
056 try {
057 // Allocate buffer once
058 final byte[] buffer = new byte[bufferSize];
059 String textRemains = workingText = Strings.EMPTY;
060 while (true) {
061 // Process until the stream is EOF.
062 final int streamReadLength = inputStream.read(buffer);
063 if (streamReadLength == END) {
064 // The input stream is EOF
065 break;
066 }
067 final String text = workingText = textRemains + new String(buffer, 0, streamReadLength, charset);
068 int beginIndex = 0;
069 while (true) {
070 // Extract and log all XML events in the buffer
071 final int[] pair = getEventIndices(text, beginIndex);
072 final int eventStartMarkerIndex = pair[0];
073 if (eventStartMarkerIndex < 0) {
074 // No more events or partial XML only in the buffer.
075 // Save the unprocessed string part
076 textRemains = text.substring(beginIndex);
077 break;
078 }
079 final int eventEndMarkerIndex = pair[1];
080 if (eventEndMarkerIndex > 0) {
081 final int eventEndXmlIndex = eventEndMarkerIndex + eventEndMarker.length();
082 final String textEvent = workingText = text.substring(eventStartMarkerIndex, eventEndXmlIndex);
083 final LogEvent logEvent = unmarshal(textEvent);
084 logEventListener.log(logEvent);
085 beginIndex = eventEndXmlIndex;
086 } else {
087 // No more events or partial XML only in the buffer.
088 // Save the unprocessed string part
089 textRemains = text.substring(beginIndex);
090 break;
091 }
092 }
093 }
094 } catch (final IOException ex) {
095 logger.error(workingText, ex);
096 }
097 }
098
099 protected Log4jLogEvent unmarshal(final String jsonEvent) throws IOException {
100 return this.objectReader.readValue(jsonEvent);
101 }
102
103 }