Bug fix for Magento 2 is an issue for every Magento developers. Sometimes the Magento offers error message is not enough to understand what happened. You can exploit \ zend_Debug :: dump () & die () to exhibit a variable on a web page. Another way to debug is to use logger. It is more professional than using dump () or tie (). Here I will explain you the following guidelines:
- Logger Interface in Magento 2
- Which model does execute the logger interface
- Observe the detail in log folder
Logger Interface in Magento 2
Magento 2 has defined logger interface at \Psr\Log\LoggerInterface. It supports several methods to write a recordslogs in a folder on the Hard Disk. I will illustrate you patterns in this interface.
interface LoggerInterface
{
/**
* System is unusable.
*
* @param string $message
* @param array $context
* @return null
*/
public function emergency($message, array $context = array());
/**
* Action must be taken immediately.
*
* Example: whole website down, database occupied, etc. This should
* set off the SMS alerts and stir you up.
*
* @param string $message
* @param array $context
* @return null
*/
public function alert($message, array $context = array());
/**
* Critical conditions.
*
* Example: Application component unavailable, unexpected exception.
*
* @param string $message
* @param array $context
* @return null
*/
public function critical($message, array $context = array());
/**
* Runtime mistake that do not need immediate action but must routinely
* be logged and observed.
*
* @param string $message
* @param array $context
* @return null
*/
public function error($message, array $context = array());
/**
* Exceptional occurrences that are not errors.
*
* Example: Employ of denounced APIs, poor utilize of an API, unwanted things
* That is not essentially wrong.
*
* @param string $message
* @param array $context
* @return null
*/
public function warning($message, array $context = array());
/**
* Normal but significant events.
*
* @param string $message
* @param array $context
* @return null
*/
public function notice($message, array $context = array());
/**
* Interesting events.
*
* Example: User logs in, SQL logs.
*
* @param string $message
* @param array $context
* @return null
*/
public function info($message, array $context = array());
/**
* Detailed debug information.
*
* @param string $message
* @param array $context
* @return null
*/
public function debug($message, array $context = array());
/**
* Logs with an arbitrary level.
*
* @param mixed $level
* @param string $message
* @param array $context
* @return null
*/
public function log($level, $message, array $context = array());
}Which model does execute the logger interface?
- Magento 2 uses Monolog to execute the \Psr\Log\LoggerInterface. You can get the Monolog at [Magento_Folder]/vendor/monolog
- Below mentioned are my examples of using logger in Magento 2.
- You can use $objectManager to get Logger object or state the Logger object in the construct function of your PHP class. For instance, I use $objectManager.
<?php
public function testLogger()
{
$logger = $this->objectManager->create('\Psr\Log\LoggerInterface');
/* save log into debug.log */
$logger->debug('Test Debug Message');
/* save log into system.log */
$logger->info('Test Info Message');
$logger->notice('Test Notice Message');
$logger->warning('Test Warning Message');
$logger->error('Test Error Message');
$logger->critical('Test Critical Message');
$logger->alert('Test Alert Message');
$logger->emergency('Test Emergency Message');
$logger->log(\Monolog\Logger::CRITICAL, 'Test Log Message');
}Observe the detail in log folder
- Notice the loggin details in /Var/log/folder
- I receive a message in the log files
[Magento_Folder]/var/log/debug.log
[2016-08-28 15:09:48] main.DEBUG: Test Debug Message {"is_exception":false} [<span style="font-weight: 400;">]</span>
- [Magento_Folder]/var/log/system.log
[2016-08-28 15:09:48] main.INFO: Test Info Message [] [] [2016-08-28 15:09:48] main.NOTICE: Test Notice Message [] [] [2016-08-28 15:09:48] main.WARNING: Test Warning Message [] [] [2016-08-28 15:09:48] main.ERROR: Test Error Message [] [] [2016-08-28 15:09:48] main.CRITICAL: Test Critical Message [] [] [2016-08-28 15:09:48] main.ALERT: Test Alert Message [] [] [2016-08-28 15:09:48] main.EMERGENCY: Test Emergency Message [] []
These are all steps to utilize Error Logger in Magento 2. Hope all you guys can study magento 2 easier with our tutorial.
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