I am writting a console application with Symfony2 components, and I want to add distinct logging channels for my services, my commands and so on. The problem: to create a new channel requires to create a new instance of Monolog, and I don't really know how to handle this in a generic way, and without needing to pass the stream handler, a channel and the proper code to bind the one and the other inside all services.
I did the trick using debug_backtrace()
:
public function log($level, $message, array $context = array ())
{
$trace = array_slice(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3), 1);
$caller = $trace[0]['class'] !== __CLASS__ ? $trace[0]['class'] : $trace[1]['class'];
if (!array_key_exists($caller, $this->loggers))
{
$monolog = new Monolog($caller);
$monolog->pushHandler($this->stream);
$this->loggers[$caller] = $monolog;
}
$this->loggers[$caller]->log($level, $message, $context);
}
Whatever from where I call my logger, it creates a channel for each class that called it. Looks cool, but as soon as a logger is called tons of time, this is performance-killing.
So here is my question:
Do you know a better generic way to create one distinct monolog channel per class that have a logger property?
The above code packaged for testing:
<kbd>composer.json</kbd>
{
"require" : {
"monolog/monolog": "~1.11.0"
}
}
<kbd>test.php</kbd>
<?php
require('vendor/autoload.php');
use Monolog\Logger;
use Monolog\Handler\StreamHandler;
class Test
{
public function __construct($logger)
{
$logger->info("test!");
}
}
class Hello
{
public function __construct($logger)
{
$logger->log(Monolog\Logger::ALERT, "hello!");
}
}
class LeveragedLogger implements \Psr\Log\LoggerInterface
{
protected $loggers;
protected $stream;
public function __construct($file, $logLevel)
{
$this->loggers = array ();
$this->stream = new StreamHandler($file, $logLevel);
}
public function alert($message, array $context = array ())
{
$this->log(Logger::ALERT, $message, $context);
}
public function critical($message, array $context = array ())
{
$this->log(Logger::CRITICAL, $message, $context);
}
public function debug($message, array $context = array ())
{
$this->log(Logger::DEBUG, $message, $context);
}
public function emergency($message, array $context = array ())
{
$this->log(Logger::EMERGENCY, $message, $context);
}
public function error($message, array $context = array ())
{
$this->log(Logger::ERROR, $message, $context);
}
public function info($message, array $context = array ())
{
$this->log(Logger::INFO, $message, $context);
}
public function log($level, $message, array $context = array ())
{
$trace = array_slice(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3), 1);
$caller = $trace[0]['class'] !== __CLASS__ ? $trace[0]['class'] : $trace[1]['class'];
if (!array_key_exists($caller, $this->loggers))
{
$monolog = new Logger($caller);
$monolog->pushHandler($this->stream);
$this->loggers[$caller] = $monolog;
}
$this->loggers[$caller]->log($level, $message, $context);
}
public function notice($message, array $context = array ())
{
$this->log(Logger::NOTICE, $message, $context);
}
public function warning($message, array $context = array ())
{
$this->log(Logger::WARNING, $message, $context);
}
}
$logger = new LeveragedLogger('php://stdout', Logger::DEBUG);
new Test($logger);
new Hello($logger);
<kbd>Usage</kbd>
ninsuo:test3 alain$ php test.php
[2014-10-21 08:59:04] Test.INFO: test! [] []
[2014-10-21 08:59:04] Hello.ALERT: hello! [] []