ConsoleLogger.php

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<?php
 
namespace MediaWiki\Logger;
 
use Psr\Log\AbstractLogger;
use Psr\Log\LoggerInterface;
use Psr\Log\LogLevel;
use Wikimedia\Assert\Assert;
 
class ConsoleLogger extends AbstractLogger {
    private const LEVELS = [
        LogLevel::DEBUG => 0,
        LogLevel::INFO => 1,
        LogLevel::NOTICE => 2,
        LogLevel::WARNING => 3,
        LogLevel::ERROR => 4,
        LogLevel::CRITICAL => 5,
        LogLevel::ALERT => 6,
        LogLevel::EMERGENCY => 7,
    ];
 
    private string $channel;
    private ?string $minLevel;
    private ?LoggerInterface $forwardTo;
 
    public function __construct(
        string $channel,
        ?string $minLevel = null,
        ?LoggerInterface $forwardTo = null
    ) {
        Assert::parameter( $minLevel === null || isset( self::LEVELS[$minLevel] ), '$minLevel',
            'must be a valid, lowercase PSR-3 log level' );
 
        $this->channel = $channel;
        $this->minLevel = $minLevel;
        $this->forwardTo = $forwardTo;
    }
 
    public function log( $level, $message, array $context = [] ): void {
        if ( !$this->minLevel || self::LEVELS[$level] >= self::LEVELS[$this->minLevel] ) {
            fwrite( STDERR, "[$level] " .
                LegacyLogger::format( $this->channel, $message, $context ) );
        }
        if ( $this->forwardTo ) {
            $this->forwardTo->log( $level, $message, $context );
        }
    }
}