/
Line.java
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/
Line.java
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/*
* Licensed to Elasticsearch B.V. under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch B.V. licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.logstash.plugins.codecs;
import co.elastic.logstash.api.Codec;
import co.elastic.logstash.api.Configuration;
import co.elastic.logstash.api.Context;
import co.elastic.logstash.api.Event;
import co.elastic.logstash.api.LogstashPlugin;
import co.elastic.logstash.api.PluginConfigSpec;
import org.logstash.StringInterpolation;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CoderResult;
import java.nio.charset.CodingErrorAction;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.function.Consumer;
import static org.logstash.ObjectMappers.JSON_MAPPER;
@LogstashPlugin(name = "java_line")
public class Line implements Codec {
public static final String DEFAULT_DELIMITER = System.lineSeparator();
private static final PluginConfigSpec<String> CHARSET_CONFIG =
PluginConfigSpec.stringSetting("charset", "UTF-8");
private static final PluginConfigSpec<String> DELIMITER_CONFIG =
PluginConfigSpec.stringSetting("delimiter", DEFAULT_DELIMITER);
private static final PluginConfigSpec<String> FORMAT_CONFIG =
PluginConfigSpec.stringSetting("format");
private Context context;
static final String MESSAGE_FIELD = "message";
private final Map<String, Object> map = new HashMap<>();
private final String delimiter;
private final Charset charset;
private String format = null;
private String id;
private final CharBuffer charBuffer = ByteBuffer.allocateDirect(64 * 1024).asCharBuffer();
private final CharsetDecoder decoder;
private String remainder = "";
/**
* Required constructor.
*
* @param id plugin id
* @param configuration Logstash Configuration
* @param context Logstash Context
*/
public Line(final String id, final Configuration configuration, final Context context) {
this(context, configuration.get(DELIMITER_CONFIG), configuration.get(CHARSET_CONFIG), configuration.get(FORMAT_CONFIG),
(id != null && !id.isEmpty()) ? id : UUID.randomUUID().toString());
}
/*
* @param configuration Logstash Configuration
* @param context Logstash Context
*/
public Line(final Configuration configuration, final Context context) {
this(null, configuration, context);
}
private Line(Context context, String delimiter, String charsetName, String format, String id) {
this.context = context;
this.id = id;
this.delimiter = delimiter;
this.charset = Charset.forName(charsetName);
this.format = format;
decoder = charset.newDecoder();
decoder.onMalformedInput(CodingErrorAction.IGNORE);
}
@Override
public void decode(ByteBuffer buffer, Consumer<Map<String, Object>> eventConsumer) {
int bufferPosition = buffer.position();
CoderResult result = decoder.decode(buffer, charBuffer, false);
charBuffer.flip();
String s = (remainder == null ? "" : remainder) + charBuffer.toString();
charBuffer.clear();
if (s.endsWith(delimiter)) {
// strip trailing delimiter, if any, to match Ruby implementation
s = s.substring(0, s.length() - delimiter.length());
} else {
int lastIndex = s.lastIndexOf(delimiter);
if (lastIndex == -1) {
buffer.position(bufferPosition);
s = "";
} else {
remainder = s.substring(lastIndex + delimiter.length(), s.length());
s = s.substring(0, lastIndex);
}
}
if (s.length() > 0) {
String[] lines = s.split(delimiter, 0);
for (int k = 0; k < lines.length; k++) {
eventConsumer.accept(simpleMap(lines[k]));
}
}
}
@Override
public void flush(ByteBuffer buffer, Consumer<Map<String, Object>> eventConsumer) {
if (remainder.length() > 0 || buffer.position() != buffer.limit()) {
try {
String remainder = this.remainder + charset.newDecoder().decode(buffer).toString();
String[] lines = remainder.split(delimiter, 0);
for (int k = 0; k < lines.length; k++) {
eventConsumer.accept(simpleMap(lines[k]));
}
} catch (CharacterCodingException e) {
throw new IllegalStateException(e);
}
}
}
@Override
public void encode(Event event, OutputStream output) throws IOException {
String outputString = (format == null
? JSON_MAPPER.writeValueAsString(event.getData())
: StringInterpolation.evaluate(event, format))
+ delimiter;
output.write(outputString.getBytes(charset));
}
private Map<String, Object> simpleMap(String message) {
map.put(MESSAGE_FIELD, message);
return map;
}
@Override
public Collection<PluginConfigSpec<?>> configSchema() {
return Arrays.asList(CHARSET_CONFIG, DELIMITER_CONFIG, FORMAT_CONFIG);
}
@Override
public String getId() {
return id;
}
@Override
public Codec cloneCodec() {
return new Line(context, delimiter, charset.name(), format, UUID.randomUUID().toString());
}
}