monolog_custom_file_log.php

<?php

namespace App\Library\Services;

use Facades\Carbon\Carbon;
use Illuminate\Support\Facades\Log;
use Monolog\Handler\StreamHandler;
use Monolog\Logger;

class CustomFileLog
{
    /** @var string */
    const LOG_FILE_LABEL = 'my-custom-file-';

    /** @var array */
    const ACCEPTED_LEVELS = [
        'emergency',
        'alert',
        'critical',
        'error',
        'warning',
        'notice',
        'info',
        'debug',
    ];

    /** @var Logger */
    protected $monolog;

    /** @var \Monolog\Handler\HandlerInterface[] */
    protected $originalHandlers;

    private function __construct()
    {
        $this->monolog = Log::getMonolog();
        $this->originalHandlers = $this->monolog->getHandlers();
    }

    /**
     * @param string $data
     * @param string $level
     */
    public static function log(string $data, string $level = 'info'): void
    {
        static $instance = null;
        if ($instance === null) {
            $instance = new CustomFileLog();
        }

        if (!in_array($level, self::ACCEPTED_LEVELS)) {
            Log::warning('Not valid level passed to CustomFileLog!');
            return;
        }

        $instance->setLocalHandler();
        Log::{$level}($data);
        $instance->setOriginalHandler();
    }

    /**
     * This is the reason this class is a singleton,
     * if procedure set more than once it will duplicate
     * logs.
     */
    private function setLocalHandler(): void
    {
        $logDate = Carbon::now()->format('Y-m-d');
        $handler = new StreamHandler(storage_path() . '/logs/' . self::LOG_FILE_LABEL . $logDate . '.log');
        $this->monolog->setHandlers([$handler]);
    }

    private function setOriginalHandler()
    {
        $this->monolog->setHandlers($this->originalHandlers);
    }
}