自定义 Laravel （monolog）日志位置,并增加请求ID

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修改 bootstrap/app.php 文件

$app->configureMonologUsing(function($monolog) use ($app) {
    $monolog->pushHandler(
        (new Monolog\Handler\RotatingFileHandler(
            '/var/logs/app/laravel',
            $app->make('config')->get('app.log_max_files', 5)
        ))->setFormatter(new Monolog\Formatter\LineFormatter(null, null, true, true))
    );
});

添加以后写入日志文件为：

-rw-r--r-- 1 web  web   93 Dec 18 15:52 laravel-2017-12-17
-rw-r--r-- 1 web  web  279 Dec 18 16:10 laravel-2017-12-18

参考：Laravel 的错误和日志记录

或者

创建app\Providers\LogServiceProvider.php 文件
修改 config\app.php providers 增加

App\Providers\LogServiceProvider::class

然后 App\Providers\LogServiceProvider.php 内容如下

<?php

namespace App\Providers;

use Illuminate\Log\LogServiceProvider as SysServiceProvider;
use Illuminate\Log\Writer;

class LogServiceProvider extends SysServiceProvider
{
    protected function configureSingleHandler(Writer $log)
    {
        $log->useFiles(
            '/var/logs/app/laravel.log',
            $this->logLevel()
        );
    }

    protected function configureDailyHandler(Writer $log)
    {
        $log->useDailyFiles(
            '/var/logs/app/laravel.log', $this->maxFiles(),
            $this->logLevel()
        );
    }
}

增加请求ID request id

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Carbon\Carbon;

class LogServiceProvider extends ServiceProvider
{
    protected $log_file;

    /**
     * Bootstrap any application services.
     * @return void
     */
    public function boot()
    {
        //
    }

    /**
     * Register any application services.
     * @return void
     */
    public function register()
    {
        $this->load_request_id();

        $this->log_configure();
    }

    /**
     * 生成 request_id
     * @return void
     */
    protected function load_request_id()
    {
        define( 'REQUEST_ID' , config('app.log_prefix').Carbon::now()->timestamp );
    }

    /**
     * 注册 monolog pushHandler
     * @return void
     */
    protected function log_configure()
    {
        $log_file = $this->getLogFile();
        $log_max_files = $this->getLogMaxFiles();

        /**
         * @doc https://d.laravel-china.org/docs/5.4/errors#自定义-Monolog-设置
         */
        $this->app->configureMonologUsing(function($monolog) use ($log_file , $log_max_files) {
            $monolog->pushHandler(
                (new \Monolog\Handler\RotatingFileHandler(
                    $log_file ,
                    $log_max_files
                ))->setFormatter(new \Monolog\Formatter\LineFormatter( "[%datetime%] [".REQUEST_ID."] %channel%.%level_name%: %message% %context% %extra%\n", null, true, true))
            );
        });
    }

    protected function getLogMaxFiles()
    {
        return config('app.log_max_files' , 5);
    }

    /**
     * @return mixed
     */
    protected function getLogFile()
    {
        if( is_null( $this->log_file) )
        {
            $this->log_file = rtrim(config('app.log_path') , DIRECTORY_SEPARATOR )."/laravel.log";
        }
        return $this->log_file;
    }
}

优化以后

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Monolog\Formatter\LineFormatter;
use Monolog\Handler\RotatingFileHandler;
use Carbon\Carbon;
use Monolog\Logger;;
use ReflectionClass;

class LogServiceProvider extends ServiceProvider
{
    protected $log_file;

    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        $this->loadRequestId();

        /**
         * 根据日期来分割日志
         */
        $this->useDailyFiles();

    }

    protected function loadRequestId()
    {
        define( 'REQUEST_ID' , config('app.log_prefix').Carbon::now()->timestamp );
    }

    /**
     * 根据日期来分割日志
     */
    protected function useDailyFiles()
    {
        $handler = $this->getDailyHandler()->setFormatter( $this->getDefaultFormatter() );

        $errorHandler = $this->getDailyHandler(Logger::ERROR)->setFormatter( $this->getDefaultFormatter() );

        $this->app->configureMonologUsing( function( $monolog) use ( $handler , $errorHandler )
        {
            $monolog->pushHandler( $handler );

            $monolog->pushHandler( $errorHandler );
        });
    }

    /**
     * 设置 日志 行格式
     * @return LineFormatter
     */
    protected function getDefaultFormatter()
    {
        $format =  "[%datetime%] [".REQUEST_ID."] %channel%.%level_name%: %message% %context% %extra%\n";
        return new LineFormatter( $format , null, true, true);
    }


    /**
     * 根据日志区分
     * @return \Monolog\Handler\RotatingFileHandler
     */
    protected function getDailyHandler( $level = Logger::DEBUG)
    {
        return new RotatingFileHandler(
            $this->logPath().$this->logName( $level ) ,
            $this->maxFiles() ,
            $level
        );
    }

    /**
     * 日志文件最多个数
     * @return int
     */
    protected function maxFiles()
    {
        if ($this->app->bound('config')) {
            return $this->app->make('config')->get('app.log_max_files', 30);
        }

        return 0;
    }

    /**
     * 日志文件名称
     * @return mixed
     */
    protected function logPath()
    {
        $logPath = $this->app->storagePath()."/logs/";
        if( $this->app->bound('config'))
        {
            $logPath = $this->app->make('config')->get('app.log_path', $logPath );
        }
        return $logPath;
    }

    /**
     * log 完整文件名
     * @param int $level
     * @return string
     */
    protected function logName( $level = Logger::DEBUG )
    {
        return $this->getAppName().'-'.$this->getLevelName( $level ).".log";
    }

    /**
     * 获取项目app
     * @return mixed
     */
    protected function getAppName()
    {
        return $this->app->make('config')->get('app.name');
    }

    /**
     * 获取log错误级别名称
     * @param $level
     * @return mixed
     */
    protected function getLevelName( $level )
    {
        $r = new ReflectionClass( Logger::class );
        $constants = array_flip( $r->getConstants() );
        return $constants[$level];
    }
}