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Introduce a pulsar log4j2 appender #1316

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Mar 2, 2018
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25 changes: 25 additions & 0 deletions pom.xml
Original file line number Diff line number Diff line change
Expand Up @@ -99,6 +99,7 @@ flexible messaging model and an intuitive client API.</description>
<module>all</module>
<module>docker</module>
<module>tests</module>
<module>pulsar-log4j2-appender</module>
</modules>

<issueManagement>
Expand Down Expand Up @@ -126,6 +127,9 @@ flexible messaging model and an intuitive client API.</description>
<jackson.version>2.8.4</jackson.version>
<puppycrawl.checkstyle.version>6.19</puppycrawl.checkstyle.version>
<dockerfile-maven.version>1.3.7</dockerfile-maven.version>

<!-- test dependencies -->
<disruptor.version>3.4.0</disruptor.version>
</properties>

<dependencyManagement>
Expand Down Expand Up @@ -362,6 +366,19 @@ flexible messaging model and an intuitive client API.</description>
<version>${log4j2.version}</version>
</dependency>

<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<type>test-jar</type>
<version>${log4j2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<type>test-jar</type>
<version>${log4j2.version}</version>
</dependency>

<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
Expand Down Expand Up @@ -599,6 +616,14 @@ flexible messaging model and an intuitive client API.</description>
<artifactId>bcpkix-jdk15on</artifactId>
<version>${bouncycastle.version}</version>
</dependency>

<!-- test dependencies -->
<dependency>
<groupId>com.lmax</groupId>
<artifactId>disruptor</artifactId>
<version>${disruptor.version}</version>
</dependency>

</dependencies>
</dependencyManagement>

Expand Down
74 changes: 74 additions & 0 deletions pulsar-log4j2-appender/pom.xml
Original file line number Diff line number Diff line change
@@ -0,0 +1,74 @@
<!--

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.

-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.apache.pulsar</groupId>
<artifactId>pulsar</artifactId>
<version>2.0.0-incubating-SNAPSHOT</version>
<relativePath>..</relativePath>
</parent>

<artifactId>pulsar-log4j2-appender</artifactId>
<name>Pulsar Log4j2 Appender</name>
<description>Pulsar Log4j2 Appender</description>

<dependencies>
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>pulsar-client</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
</dependency>

<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<type>test-jar</type>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<type>test-jar</type>
<scope>test</scope>
</dependency>
<!-- Required for AsyncLoggers -->
<dependency>
<groupId>com.lmax</groupId>
<artifactId>disruptor</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

</project>
Original file line number Diff line number Diff line change
@@ -0,0 +1,211 @@
/**
* 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.pulsar.log4j2.appender;

import java.io.Serializable;
import java.util.Objects;
import java.util.concurrent.TimeUnit;
import org.apache.logging.log4j.core.AbstractLifeCycle;
import org.apache.logging.log4j.core.Appender;
import org.apache.logging.log4j.core.Filter;
import org.apache.logging.log4j.core.Layout;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.appender.AbstractAppender;
import org.apache.logging.log4j.core.config.Node;
import org.apache.logging.log4j.core.config.Property;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory;
import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.layout.SerializedLayout;

/**
* The PulsarAppender logs events to an Apache Pulsar topic.
*
* <p>Each log event is sent as a Pulsar record.
*/
@Plugin(
name = "Pulsar",
category = Node.CATEGORY,
elementType = Appender.ELEMENT_TYPE,
printObject = true)
public final class PulsarAppender extends AbstractAppender {

/**
* Builds PulsarAppender instances.
* @param <B> The type to build
*/
public static class Builder<B extends Builder<B>> extends AbstractAppender.Builder<B>
implements org.apache.logging.log4j.core.util.Builder<PulsarAppender> {

@PluginAttribute("key")
private String key;

@PluginAttribute("topic")
private String topic;

@PluginAttribute("serviceUrl")
private String serviceUrl;

@PluginAttribute(value = "avoidRecursive", defaultBoolean = true)
private boolean avoidRecursive;

@PluginAttribute(value = "syncSend", defaultBoolean = false)
private boolean syncSend;

@PluginElement("Properties")
private Property[] properties;

@SuppressWarnings("resource")
@Override
public PulsarAppender build() {
final Layout<? extends Serializable> layout = getLayout();
if (layout == null) {
AbstractLifeCycle.LOGGER.error("No layout provided for PulsarAppender");
return null;
}
PulsarManager manager = new PulsarManager(
getConfiguration().getLoggerContext(),
getName(),
serviceUrl,
topic,
syncSend,
properties,
key);
return new PulsarAppender(
getName(),
layout,
getFilter(),
isIgnoreExceptions(),
avoidRecursive,
manager);
}

public String getTopic() {
return topic;
}

public boolean isSyncSend() {
return syncSend;
}

public Property[] getProperties() {
return properties;
}

public B setTopic(final String topic) {
this.topic = topic;
return asBuilder();
}

public B setSyncSend(final boolean syncSend) {
this.syncSend = syncSend;
return asBuilder();
}

public B setProperties(final Property[] properties) {
this.properties = properties;
return asBuilder();
}
}

/**
* Creates a builder for a PulsarAppender.
* @return a builder for a PulsarAppender.
*/
@PluginBuilderFactory
public static <B extends Builder<B>> B newBuilder() {
return new Builder<B>().asBuilder();
}

private final boolean avoidRecursive;
private final PulsarManager manager;

private PulsarAppender(
final String name,
final Layout<? extends Serializable> layout,
final Filter filter,
final boolean ignoreExceptions,
final boolean avoidRecursive,
final PulsarManager manager) {
super(name, filter, layout, ignoreExceptions);
this.avoidRecursive = avoidRecursive;
this.manager = Objects.requireNonNull(manager, "manager");
}

@Override
public void append(final LogEvent event) {
if (avoidRecursive
&& event.getLoggerName() != null
&& event.getLoggerName().startsWith("org.apache.pulsar")) {
LOGGER.warn("Recursive logging from [{}] for appender [{}].", event.getLoggerName(), getName());
} else {
try {
tryAppend(event);
} catch (final Exception e) {
error("Unable to write to Pulsar in appender [" + getName() + "]", event, e);
}
}
}

private void tryAppend(final LogEvent event) {
final Layout<? extends Serializable> layout = getLayout();
byte[] data;
if (layout instanceof SerializedLayout) {
final byte[] header = layout.getHeader();
final byte[] body = layout.toByteArray(event);
data = new byte[header.length + body.length];
System.arraycopy(header, 0, data, 0, header.length);
System.arraycopy(body, 0, data, header.length, body.length);
} else {
data = layout.toByteArray(event);
}
manager.send(data);
}

@Override
public void start() {
super.start();
try {
manager.startup();
} catch (Exception e) {
// fail to start the manager
}
}

@Override
public boolean stop(final long timeout, final TimeUnit timeUnit) {
setStopping();
boolean stopped = super.stop(timeout, timeUnit, false);
stopped &= manager.stop(timeout, timeUnit);
setStopped();
return stopped;
}

@Override
public String toString() {
return "PulsarAppender{" +
"name=" + getName() +
", state=" + getState() +
", serviceUrl=" + manager.getServiceUrl() +
", topic=" + manager.getTopic() +
'}';
}

}
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