[logback-user] [ConfigurationDelegate.groovy] LogstashTcpSocketAppender

24 Mar 2016

      Hi,

In a Grails app for my customer I'm using the LogstashTcpSocketAppender
provided by this project
https://github.com/logstash/logstash-logback-encoder.

It works perfectly fine with the logback.xml configuration which looks as
follows:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

    <shutdownHook class="ch.qos.logback.core.hook.DelayingShutdownHook"/>

    <appender name="console" class="ch.qos.logback.core.ConsoleAppender"/>

    <appender name="tcp"
class="net.logstash.logback.appender.LogstashTcpSocketAppender">
        <destination>localhost:4560</destination>
        <encoder
class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">
            <providers>
                <message/>
                <mdc/>
                <arguments/>
            </providers>
        </encoder>
    </appender>

    <root level="all">
        <appender-ref ref="console"/>
        <appender-ref ref="tcp"/>
    </root>

</configuration>

However I had hard time configuring the same in logback.groovy; Do you have
any idea how to configure LogstashTcpSocketAppender in groovy style? So far
I came up with the following snippet which sucks a bit because it depends
on Logback internals (mixed in ConfigurationDelegate properties/methods):

import ch.qos.logback.core.Appender
import net.logstash.logback.appender.LogstashTcpSocketAppender
import net.logstash.logback.composite.JsonProviders
import net.logstash.logback.composite.loggingevent.ArgumentsJsonProvider
import net.logstash.logback.composite.loggingevent.MdcJsonProvider
import net.logstash.logback.composite.loggingevent.MessageJsonProvider
import net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder

appender('STDOUT', ConsoleAppender) {
    encoder(PatternLayoutEncoder) {
        pattern = '%-4relative [%thread] %msg%n'
    }
}

addAppender('LOGSTASH_TCP', createLogstashTcpSocketAppender('localhost:4560'))

root(DEBUG, ['STDOUT', 'LOGSTASH_TCP'])

println appenderList

Appender createLogstashTcpSocketAppender(String destination) {
    LoggingEventCompositeJsonEncoder encoder = new
LoggingEventCompositeJsonEncoder()
    JsonProviders providers = new JsonProviders()
    providers.addProvider(new MessageJsonProvider())
    providers.addProvider(new MdcJsonProvider())
    providers.addProvider(new ArgumentsJsonProvider())
    encoder.setProviders(providers)

    Appender appender = new LogstashTcpSocketAppender()
    appender.addDestination(destination)
    appender.setEncoder(encoder)
    appender
}

void addAppender(String name, Appender appender) {
    appender.name = name
    appender.context = context

    appenderList.add(appender)
    appender.start()
}

Regards,
Daniel Pacak