概述

Laravel 框架自带的日志功能，默认是已文件的形式把系统日志记录在/storage/logs目录，我们的项目大部分部署在k8s容器，这导致我们项目在线上环境出现异常问题时，查看日志不太方便，并且不是所有开发人员都有线上环境账号。
因此尝试，扩展laravel日志通道，把日志记录在mysql。
要将Laravel日志保存在mysql数据库中，需要做以下几个步骤：

1. Laravel 配置

config/logging.php 配置文件

'channels' => [
    'mysql' => [
        'driver' => 'custom',
        'via' => App\Logging\MysqlLogger::class,
    ],
]

.env 文件

LOG_MYSQL_CHANNEL_TABLE=logs #表名
LOG_MYSQL_CHANNEL_CONNECTION=logs #mysql链接

app/config/database.php 加入logs mysql链接信息

//记录一些自定义的系统运行日志
    'logs' => [
        'driver' => 'mysql',
        'url' => env('DATABASE_URL'),
        'host' => env('DB_HOST', '127.0.0.1'),
        'port' => env('DB_PORT', '3306'),
        'database' => env('DB_DATABASE', 'forge'),
        'username' => env('DB_USERNAME', 'forge'),
        'password' => env('DB_PASSWORD', ''),
        'unix_socket' => env('DB_SOCKET', ''),
        'charset' => 'utf8mb4',
        'collation' => 'utf8mb4_unicode_ci',
        'prefix' => '',
        'prefix_indexes' => true,
        'strict' => true,
        'engine' => null,
        'options' => extension_loaded('pdo_mysql') ? array_filter([
            PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
        ]) : [],
    ],

2. 日志通道代码编写

定义日志通道
app/Logging/MysqlLogger.php

<?php
/**
 * 定义mysql日志channel
 */
namespace App\Logging;

class MysqlLogger
{

    public function __invoke(array $config){
        return tap(new \Monolog\Logger('mysql'), function ($logger) {
            $logger->pushHandler(new MysqlLoggerHandler());
        });
    }
}

然后添加一个自定义的 Monolog 发射器（handler）到您的应用中以记录日志到 MySQL：
app/Logging/MysqlLoggerHandler.php

<?php
/**
 * 日志写入mysql表logs
 */

namespace App\Logging;

use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Monolog\Handler\AbstractProcessingHandler;
use Monolog\Logger;

class MysqlLoggerHandler extends AbstractProcessingHandler
{

    public $table;
    public $connection;

    public function __construct($level = Logger::DEBUG, bool $bubble = true)
    {
        $this->table = env('LOG_MYSQL_CHANNEL_TABLE','logs');
        $this->connection = env('LOG_MYSQL_CHANNEL_CONNECTION','logs');
        parent::__construct($level, $bubble);
    }

    protected function write(array $record): void
    {
        try{
            if(isset($record['context']['exception']) && is_object($record['context']['exception'])){
                $record['context']['exception'] = (array)$record['context']['exception'];
            }
            $record['request_data'] = request()->all() ??[];
            $log = [
                'guid' => guid(),
                'title' => $record['message'],
                'level' => $record['level_name'],
                'request_host' => $record['request_host'] ?? request()->getSchemeAndHttpHost(),
                'request_uri' => $record['request_uri'] ?? request()->getRequestUri(),
                'request_method' => $record['request_method'] ?? request()->getMethod(),
                'request_ip' => request()->getClientIp(),
                'request_data' => json_encode($record['request_data']) ,
                'context' => isset($record['context']) ? json_encode($record['context']) : '',
                'created_at' => $record['datetime']->format('Y-m-d H:i:s'),
                'updated_at' => $record['datetime']->format('Y-m-d H:i:s'),
            ];
            if($this->connection && $this->table){
                // TODO: Implement write() method.
                DB::connection($this->connection)->table($this->table)->insert(
                    $log
                );
            }
        }catch (\Exception $e){
            Log::channel('daily')->error($e->getMessage().$e->getFile().$e->getTraceAsString());
        }
    }
}

3.创建储存日志logs表

CREATE TABLE `logs` (
  `guid` varchar(64) NOT NULL COMMENT '自增主键',
  `title` text COMMENT '标题',
  `level` varchar(64) DEFAULT '' COMMENT '日志等级 INFO/ERROR...',
  `request_host` varchar(255) DEFAULT NULL COMMENT '请求host',
  `request_uri` varchar(128) NOT NULL COMMENT '请求uri',
  `request_method` varchar(512) DEFAULT NULL COMMENT '请求方法',
  `request_data` text COMMENT '请求参数',
  `request_ip` varchar(255) DEFAULT NULL COMMENT 'ip',
  `context` text COMMENT '额外参数',
  `created_at` timestamp NULL DEFAULT NULL COMMENT '创建时间',
  `updated_at` timestamp NULL DEFAULT NULL COMMENT '更新时间',
  `deleted_at` timestamp NULL DEFAULT NULL COMMENT '删除时间',
  PRIMARY KEY (`guid`),
  KEY `request_uri` (`request_uri`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='系统运行日志记录表';

4.代码使用

Log::channel('mysql')->info('测试日志写入mysql',['a' => time()]);

5.注意：记录mysql执行sql语句的日志需要进行以下修改避免日志无限死循环记录

如： app/Providers/AppServiceProvider.php

if($this->app->environment() !== 'production'){
    DB::listen(function ($query) {
        $tmp = str_replace('?', '"'.'%s'.'"', $query->sql);
        $qBindings = [];
        foreach ($query->bindings as $key => $value) {
            if (is_numeric($key)) {
                $qBindings[] = $value;
            } else {
                $tmp = str_replace(':'.$key, '"'.$value.'"', $tmp);
            }
        }
        $tmp = vsprintf($tmp, $qBindings);
        $tmp = str_replace("\\", "", $tmp);
        #这里必须指定通道，避免无限循环写日志
        Log::channel('daily')->info(' execution time: '.$query->time.'ms; '.$tmp);

    });
}