Logging to custom file is not working from module helper

Question

I wanted to wrap the logging functionality in my module helper.

I have defined Custom Logger as:

File: app/code/MagePsycho/CustomLogger/etc/di.xml

<?xml version="1.0"?>
<!--
/**
 * @category   MagePsycho
 * @package    MagePsycho_CustomLogger
 * @author     [email protected]
 * @website    http://www.magepsycho.com
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

    <virtualType name="MagePsychoCustomLogger" type="Magento\Framework\Logger\Monolog">
        <arguments>
            <argument name="handlers"  xsi:type="array">
                <item name="debug" xsi:type="object">MagePsycho\CustomLogger\Logger\Handler\Custom</item>
            </argument>
        </arguments>
    </virtualType>

    <!-- DI for Module Observer -->
    <type name="MagePsycho\CustomLogger\Observer\ControllerActionPredispatch">
        <arguments>
            <argument name="logger" xsi:type="object">MagePsychoCustomLogger</argument>
        </arguments>
    </type>

    <!-- DI for Module Helper -->
    <type name="MagePsycho\CustomLogger\Helper\Data">
        <arguments>
            <argument name="logger" xsi:type="object">MagePsychoCustomLogger</argument>
        </arguments>
    </type>

</config>

File: app/code/MagePsycho/CustomLogger/Helper/Data.php

<?php
namespace MagePsycho\CustomLogger\Helper;
/**
 * @category   MagePsycho
 * @package    MagePsycho_CustomLogger
 * @author     [email protected]
 * @website    http://www.magepsycho.com
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */
class Data extends \Magento\Framework\App\Helper\AbstractHelper
{
    protected $_logger;
    /**
     * @param \Magento\Framework\App\Helper\Context $context
     * @param \Psr\Log\LoggerInterface $logger
     * @param \Magento\Framework\Module\ModuleListInterface $moduleList
     */
    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Psr\Log\LoggerInterface $logger,
        \Magento\Framework\Module\ModuleListInterface $moduleList
    ) {
        $this->_logger                  = $logger; //$context->getLogger();
        $this->_moduleList              = $moduleList;
        parent::__construct($context);
    }
    /**
     * Logging Utility
     *
     * @param $message
     * @param bool|false $useSeparator
     */
    public function log($message, $useSeparator = false)
    {
        //Even this is not working
        #$this->_logger->pushHandler( new \Monolog\Handler\StreamHandler( '/var/log/magepsycho_customlogger.log') );
        if ($useSeparator) {
            $this->_logger->addDebug(str_repeat('=', 100));
        }
        $this->_logger->addDebug($message);
    }
}

And trying to use as (from any observer, model, block classes)

/**
  * @var \MagePsycho\CustomLogger\Helper
  */
 protected $_helper;

 public function __construct(
     \MagePsycho\CustomLogger\Helper\Data $helper
 ) {
     $this->_helper          = $helper;
 }

And call it from any methods

$this->_helper->log('message to be logged...');

But this is always logging to var/log/debug.log file. If I use directly use the logger as DI, it works. But I wanted the logging functionality via Helper class. Any idea what am I doing wrong?

You can find the sample module that I am using for custom logger: https://github.com/MagePsycho/magento2-custom-logger

Answer 1

I was able to fix the issue. The issue was related with the Constructor DI $logger in \MagePsycho\CustomLogger\Helper\Data.

Solution:
Renaming the $logger to $customLogger in the Helper class and di.xml fixed the issue.

Updated working code can be found at: https://github.com/MagePsycho/magento2-custom-logger

Answer 2

I confirm the issue

I debuged the code source of the extension then i found that when you called

$this->_helper->log('something', true);

from an other class

$this->_helper call the class Magento\Backend\Helper\Data not the \MagePsycho\CustomLogger\Helper\Data

I solved the problem by renaming $_helper var to something else.

To resolve your problem

uncomment this line

$this->_logger->pushHandler( new \Monolog\Handler\StreamHandler( '/var/log/magepsycho_customlogger.log') );

in this file \MagePsycho\CustomLogger\Helper\Data

to be like

$this->_logger->pushHandler( new \Monolog\Handler\StreamHandler( 'var/log/magepsycho_customlogger.log') );

NB: There is an other solution more simple to use custom logs

Logs and Magento 2