Handlers

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ElasticsearchLogstashHandler

This handler deals directly with the HTTP interface of Elasticsearch. This means it will slow down your application if Elasticsearch takes time to answer. Even if all HTTP calls are done asynchronously.

To use it, declare it as a service:

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        # config/services.yaml
services:
    Symfony\Bridge\Monolog\Handler\ElasticsearchLogstashHandler: ~

    # optionally, configure the handler using the constructor arguments (shown values are default)
    Symfony\Bridge\Monolog\Handler\ElasticsearchLogstashHandler:
        arguments:
            $endpoint: "http://127.0.0.1:9200"
            $index: "monolog"
            $client: null
            $level: !php/const Monolog\Logger::DEBUG
            $bubble: true
            $elasticsearchVersion: '1.0.0'
    

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        <!-- config/services.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:monolog="http://symfony.com/schema/dic/monolog"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/monolog
        https://symfony.com/schema/dic/monolog/monolog-1.0.xsd">

    <services>
        <service id="Symfony\Bridge\Monolog\Handler\ElasticsearchLogstashHandler"/>

        <!-- optionally, configure the handler using the constructor arguments (shown values are default) -->
        <service id="Symfony\Bridge\Monolog\Handler\ElasticsearchLogstashHandler">
            <argument key="endpoint">http://127.0.0.1:9200</argument>
            <argument key="index">monolog</argument>
            <argument key="client"/>
            <argument key="level" type="constant">Monolog\Logger::DEBUG</argument>
            <argument key="bubble">true</argument>
            <argument key="elasticsearchVersion">1.0.0</argument>
        </service>
    </services>
</container>
    

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        // config/services.php
use Monolog\Logger;
use Symfony\Bridge\Monolog\Handler\ElasticsearchLogstashHandler;

$container->register(ElasticsearchLogstashHandler::class);

// optionally, configure the handler using the constructor arguments (shown values are default)
$container->register(ElasticsearchLogstashHandler::class)
    ->setArguments([
        '$endpoint' => "http://127.0.0.1:9200",
        '$index' => "monolog",
        '$client' => null,
        '$level' => Logger::DEBUG,
        '$bubble' => true,
        '$elasticsearchVersion' => '1.0.0',
    ])
;
    

Then reference it in the Monolog configuration.

In a development environment, it's fine to keep the default configuration: for each log, an HTTP request will be made to push the log to Elasticsearch:

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        # config/packages/prod/monolog.yaml
monolog:
    handlers:
        es:
            type: service
            id: Symfony\Bridge\Monolog\Handler\ElasticsearchLogstashHandler
    

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        <!-- config/packages/prod/monolog.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:monolog="http://symfony.com/schema/dic/monolog"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/monolog
        https://symfony.com/schema/dic/monolog/monolog-1.0.xsd">

    <monolog:config>
        <monolog:handler
            name="es"
            type="service"
            id="Symfony\Bridge\Monolog\Handler\ElasticsearchLogstashHandler"
        />
    </monolog:config>
</container>
    

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        // config/packages/prod/monolog.php
use Symfony\Bridge\Monolog\Handler\ElasticsearchLogstashHandler;
use Symfony\Config\MonologConfig;

return static function (MonologConfig $monolog): void {
    $monolog->handler('es')
        ->type('service')
        ->id(ElasticsearchLogstashHandler::class)
    ;
};
    

In a production environment, it's highly recommended to wrap this handler in a handler with buffering capabilities (like the FingersCrossedHandler or BufferHandler) in order to call Elasticsearch only once with a bulk push. For even better performance and fault tolerance, a proper ELK stack is recommended.

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        # config/packages/prod/monolog.yaml
monolog:
    handlers:
        main:
            type: fingers_crossed
            handler: es

        es:
            type: service
            id: Symfony\Bridge\Monolog\Handler\ElasticsearchLogstashHandler
    

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        <!-- config/packages/prod/monolog.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:monolog="http://symfony.com/schema/dic/monolog"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/monolog
        https://symfony.com/schema/dic/monolog/monolog-1.0.xsd">

    <monolog:config>
        <monolog:handler
            name="main"
            type="fingers_crossed"
            handler="es"
        />
        <monolog:handler
            name="es"
            type="service"
            id="Symfony\Bridge\Monolog\Handler\ElasticsearchLogstashHandler"
        />
    </monolog:config>
</container>
    

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        // config/packages/prod/monolog.php
use Symfony\Bridge\Monolog\Handler\ElasticsearchLogstashHandler;
use Symfony\Config\MonologConfig;

return static function (MonologConfig $monolog): void {
    $monolog->handler('main')
        ->type('fingers_crossed')
        ->handler('es')
    ;
    $monolog->handler('es')
        ->type('service')
        ->id(ElasticsearchLogstashHandler::class)
    ;
};
    

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.

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