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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.logging.log4j.core.appender.mom.kafka;
import java.nio.charset.StandardCharsets;
import java.util.Objects;
import java.util.Properties;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.clients.producer.RecordMetadata;
import org.apache.kafka.common.serialization.ByteArraySerializer;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.appender.AbstractManager;
import org.apache.logging.log4j.core.appender.ManagerFactory;
import org.apache.logging.log4j.core.config.Property;
import org.apache.logging.log4j.core.util.Integers;
import org.apache.logging.log4j.core.util.Log4jThread;
public class KafkaManager extends AbstractManager {
public static final String DEFAULT_TIMEOUT_MILLIS = "30000";
/**
* package-private access for testing.
*/
static KafkaProducerFactory producerFactory = new DefaultKafkaProducerFactory();
private final Properties config = new Properties();
private Producer producer;
private final int timeoutMillis;
private final String topic;
private final String key;
private final boolean syncSend;
private final boolean sendTimestamp;
private static final KafkaManagerFactory factory = new KafkaManagerFactory();
/*
* The Constructor should have been declared private as all Managers are create
* by the internal factory;
*/
public KafkaManager(
final LoggerContext loggerContext,
final String name,
final String topic,
final boolean syncSend,
final Property[] properties,
final String key) {
this(loggerContext, name, topic, syncSend, false, properties, key);
}
private KafkaManager(
final LoggerContext loggerContext,
final String name,
final String topic,
final boolean syncSend,
final boolean sendTimestamp,
final Property[] properties,
final String key) {
super(loggerContext, name);
this.topic = Objects.requireNonNull(topic, "topic");
this.syncSend = syncSend;
this.sendTimestamp = sendTimestamp;
config.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, ByteArraySerializer.class);
config.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, ByteArraySerializer.class);
config.put(ProducerConfig.BATCH_SIZE_CONFIG, 0);
for (final Property property : properties) {
config.setProperty(property.getName(), property.getValue());
}
this.key = key;
String timeoutMillis = config.getProperty("timeout.ms");
if (timeoutMillis == null) {
timeoutMillis = config.getProperty(ProducerConfig.REQUEST_TIMEOUT_MS_CONFIG, DEFAULT_TIMEOUT_MILLIS);
}
this.timeoutMillis = Integers.parseInt(timeoutMillis);
}
@Override
public boolean releaseSub(final long timeout, final TimeUnit timeUnit) {
if (timeout > 0) {
closeProducer(timeout, timeUnit);
} else {
closeProducer(timeoutMillis, TimeUnit.MILLISECONDS);
}
return true;
}
private void closeProducer(final long timeout, final TimeUnit timeUnit) {
if (producer != null) {
// This thread is a workaround for this Kafka issue:
// https://issues.apache.org/jira/browse/KAFKA-1660
final Thread closeThread = new Log4jThread(
() -> {
if (producer != null) {
producer.close();
}
},
"KafkaManager-CloseThread");
closeThread.setDaemon(true); // avoid blocking JVM shutdown
closeThread.start();
try {
closeThread.join(timeUnit.toMillis(timeout));
} catch (final InterruptedException ignore) {
Thread.currentThread().interrupt();
// ignore
}
}
}
@Deprecated
public void send(final byte[] msg) throws ExecutionException, InterruptedException, TimeoutException {
send(msg, null);
}
public void send(final byte[] msg, final Long eventTimestamp)
throws ExecutionException, InterruptedException, TimeoutException {
if (producer != null) {
byte[] newKey = null;
if (key != null && key.contains("${")) {
newKey = getLoggerContext()
.getConfiguration()
.getStrSubstitutor()
.replace(key)
.getBytes(StandardCharsets.UTF_8);
} else if (key != null) {
newKey = key.getBytes(StandardCharsets.UTF_8);
}
final Long timestamp = sendTimestamp ? eventTimestamp : null;
final ProducerRecord newRecord = new ProducerRecord<>(topic, null, timestamp, newKey, msg);
if (syncSend) {
final Future response = producer.send(newRecord);
response.get(timeoutMillis, TimeUnit.MILLISECONDS);
} else {
producer.send(newRecord, (metadata, e) -> {
if (e != null) {
LOGGER.error("Unable to write to Kafka in appender [" + getName() + "]", e);
}
});
}
}
}
public void startup() {
if (producer == null) {
producer = producerFactory.newKafkaProducer(config);
}
}
public String getTopic() {
return topic;
}
@Deprecated
public static KafkaManager getManager(
final LoggerContext loggerContext,
final String name,
final String topic,
final boolean syncSend,
final Property[] properties,
final String key) {
return getManager(loggerContext, name, topic, syncSend, false, properties, key);
}
static KafkaManager getManager(
final LoggerContext loggerContext,
final String name,
final String topic,
final boolean syncSend,
final boolean sendTimestamp,
final Property[] properties,
final String key) {
final StringBuilder sb = new StringBuilder(name);
sb.append(" ").append(topic).append(" ").append(syncSend).append(" ").append(sendTimestamp);
for (Property prop : properties) {
sb.append(" ").append(prop.getName()).append("=").append(prop.getValue());
}
return getManager(
sb.toString(),
factory,
new FactoryData(loggerContext, topic, syncSend, sendTimestamp, properties, key));
}
private static class FactoryData {
private final LoggerContext loggerContext;
private final String topic;
private final boolean syncSend;
private final boolean sendTimestamp;
private final Property[] properties;
private final String key;
public FactoryData(
final LoggerContext loggerContext,
final String topic,
final boolean syncSend,
final boolean sendTimestamp,
final Property[] properties,
final String key) {
this.loggerContext = loggerContext;
this.topic = topic;
this.syncSend = syncSend;
this.sendTimestamp = sendTimestamp;
this.properties = properties;
this.key = key;
}
}
private static class KafkaManagerFactory implements ManagerFactory {
@Override
public KafkaManager createManager(final String name, final FactoryData data) {
return new KafkaManager(
data.loggerContext, name, data.topic, data.syncSend, data.sendTimestamp, data.properties, data.key);
}
}
}
