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永夜

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Static Variables Persist Across Queue Tasks in Laravel 6: A Fix

Reference: https://www.shuijingwanwq.com/2022/07/15/6796/ . In Laravel 6 queue jobs, handling task failures (setting and getting static variables). However, there is a bug: if it is not reset in the next queue job, the previous value is reused. I printed the static variable self::$destination in two separate jobs. I expected the destination for job 755 to be null, but it reused the value from job 754

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1. Reference: In Laravel 6 queue jobs, handling task failures (setting and getting static variables). However, there is a bug: if it is not reset in the next queue job, the previous value is reused. I printed the static variable self::$destination in two separate jobs. I expected the destination for job 755 to be null, but it reused the value from job 754. See Figure 1.

Reference: https://www.shuijingwanwq.com/2022/07/15/6796/ . In Laravel 6 queue jobs, handling task failures (setting and getting static variables). However, there is a bug: if it is not reset in the next queue job, the previous value is reused. I printed the static variable self::$destination in two separate jobs. I expected the destination for job 755 to be null, but it reused the value from job 754
Figure 1
PHP

    private static ?string $destination = null; // 解压缩 ZIP 文件后的目录

	Log::info(
		'destination',
		[
			'id' => $this->themeInstallationTask->id,
			'destination' => self::$destination
		]
	);
Plaintext

[2023-04-14 13:37:18] local.INFO: uploadThemeAssetToCdn {
    "id": 754,
    "destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/14/1681450622.2291.583840996"
} 
[2023-04-14 13:38:06] local.INFO: uploadThemeAssetToCdn {
    "id": 755,
    "destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/14/1681450622.2291.583840996"
}

2. If the static variable is explicitly reset to null in the next queue job, it gets overwritten. I printed the static variable self::$destination in both jobs, and the results matched expectations. See Figure 2.

If the static variable is explicitly reset to null in the next queue job, it gets overwritten. I printed the static variable self::$destination in both jobs, and the results matched expectations
Figure 2
PHP

    private static ?string $destination = null; // 解压缩 ZIP 文件后的目录

	self::$destination = null;

	Log::info(
		'uploadThemeAssetToCdn',
		[
			'id' => $this->themeInstallationTask->id,
			'destination' => self::$destination
		]
	);
Plaintext

[2023-04-14 13:44:46] local.INFO: uploadThemeAssetToCdn {
    "id": 756,
    "destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/14/1681451070.5331.338264899"
} 
[2023-04-14 13:45:34] local.INFO: uploadThemeAssetToCdn {
    "id": 757,
    "destination": null
}

3. However, referencing the implementation of exponential backoff during queue job retries in Laravel 6, trying to pass the static variable to the next queue job still causes mutual overwriting. In the handle method, I expected the value for job 760 to not be null, but it has now been overwritten by the null value from job 761. See Figure 3.

However, referencing the implementation of exponential backoff during queue job retries in Laravel 6, trying to pass the static variable to the next queue job still causes mutual overwriting. In the handle method, I expected the value for job 760 to not be null, but it has now been overwritten by the null value from job 761
Figure 3
PHP

    private static ?string $absolutePath; // 待解压缩的 ZIP 文件的绝对路径
    private static ?string $destination; // 解压缩 ZIP 文件后的目录

    /**
     * Create a new job instance.
     *
     * @return void
     */
    public function __construct(ThemeInstallationTask $themeInstallationTask, ?string $absolutePath, ?string $destination)
    {
        // 队列任务构造器中接收了 Eloquent 模型，将会只序列化模型的 ID
        $this->themeInstallationTask = $themeInstallationTask;
        self::$absolutePath = $absolutePath;
        self::$destination = $destination;
        Log::info(
            'construct',
            [
                'id' => $this->themeInstallationTask->id,
                'destination' => self::$destination
            ]
        );
    }

    /**
     * Execute the job.
     *
     * @return void
     * @throws OverflowException
     */
    public function handle()
    {
        Log::info(
            'handle',
            [
                'id' => $this->themeInstallationTask->id,
                'destination' => self::$destination
            ]
        );
		
	}
Plaintext

PS E:\wwwroot\object> php artisan queue:work
[2023-04-14 14:06:03][ACuiiTG0Ptuo5Tl3iMCPnREKYZhGTva3] Processing: Jobs\ThemeInstalling
[2023-04-14 14:06:50][ACuiiTG0Ptuo5Tl3iMCPnREKYZhGTva3] Processed:  Jobs\ThemeInstalling
[2023-04-14 14:06:50][xcL1KIALWlYy9edrKD3GpqkWOzCbudSu] Processing: Jobs\ThemeInstalling
[2023-04-14 14:07:22][xcL1KIALWlYy9edrKD3GpqkWOzCbudSu] Processed:  Jobs\ThemeInstalling
[2023-04-14 14:07:22][Ff7Pcd8szupQYVAO2BkQhGJxyoQKrpo8] Processing: Jobs\ThemeAssetUploading
[2023-04-14 14:07:42][Ff7Pcd8szupQYVAO2BkQhGJxyoQKrpo8] Processed:  Jobs\ThemeAssetUploading
[2023-04-14 14:07:42][Nyc3IPP2mXHz3Hl2tT4RADsKNTAhxf1l] Processing: Jobs\ThemeAssetUploading
[2023-04-14 14:07:45][Nyc3IPP2mXHz3Hl2tT4RADsKNTAhxf1l] Processed:  Jobs\ThemeAssetUploading
[2023-04-14 14:07:45][gaMvLrJttc4Ws1qu2rAAsORFGAfPNZmq] Processing: Jobs\ThemeInstalled
[2023-04-14 14:07:45][gaMvLrJttc4Ws1qu2rAAsORFGAfPNZmq] Processed:  Jobs\ThemeInstalled
[2023-04-14 14:07:45][QALQV7djT9caKVH50HHZLe0x3OScalBP] Processing: Jobs\ThemeInstalled
[2023-04-14 14:07:45][QALQV7djT9caKVH50HHZLe0x3OScalBP] Processed:  Jobs\ThemeInstalled


[2023-04-14 14:06:19] local.INFO: uploadThemeAssetToCdn {
    "id": 760,
    "destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/14/1681452363.3555.1473533151"
} 
[2023-04-14 14:06:19] local.INFO: construct {
    "id": 760,
    "destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/14/1681452363.3555.1473533151"
} 
[2023-04-14 14:06:53] local.INFO: uploadThemeAssetToCdn {
    "id": 761,
    "destination": null
} 
[2023-04-14 14:06:53] local.INFO: construct {
    "id": 761,
    "destination": null
} 
[2023-04-14 14:07:22] local.INFO: handle {
    "id": 760,
    "destination": null
} 
[2023-04-14 14:07:22] local.INFO: destination {
    "id": 760,
    "destination": null
} 
[2023-04-14 14:07:42] local.INFO: destination {
    "id": 760,
    "destination": null
} 
[2023-04-14 14:07:42] local.INFO: handle {
    "id": 761,
    "destination": null
} 
[2023-04-14 14:07:42] local.INFO: destination {
    "id": 761,
    "destination": null
} 
[2023-04-14 14:07:45] local.INFO: destination {
    "id": 761,
    "destination": null
}

4. I ultimately decided to abandon static variables and store the corresponding values in the MySQL table records related to the queue jobs. The queue jobs no longer interfere with each other, which meets expectations. See Figure 4.

I ultimately decided to abandon static variables and store the corresponding values in the MySQL table records related to the queue jobs. The queue jobs no longer interfere with each other, which meets expectations
Figure 4
JSON

{
  "theme_download_paths": {
    "zip_path": "/theme_downloads/2023/04/17/1681696283.1861.462360447.zip",
    "destination": "/theme_downloads/2023/04/17/1681696283.1861.462360447"
  }
}
Plaintext

PS E:\wwwroot\object> php artisan queue:work
[2023-04-17 09:51:22][0Ta6TjtzacnMmI50uh9Ti3s9qfh5c5H1] Processing: Jobs\ThemeInstalling
[2023-04-17 09:52:21][0Ta6TjtzacnMmI50uh9Ti3s9qfh5c5H1] Processed:  Jobs\ThemeInstalling
[2023-04-17 09:52:21][dcjXRXkV2XgHdhQrGkYy3Yyq9vy7iiDh] Processing: Jobs\ThemeInstalling
[2023-04-17 09:52:59][dcjXRXkV2XgHdhQrGkYy3Yyq9vy7iiDh] Processed:  Jobs\ThemeInstalling
[2023-04-17 09:52:59][v8MkfSZlf6PtoXi8tqNcDb4SXCp6KTGk] Processing: Jobs\ThemeAssetUploading
[2023-04-17 09:53:02][v8MkfSZlf6PtoXi8tqNcDb4SXCp6KTGk] Processed:  Jobs\ThemeAssetUploading
[2023-04-17 09:53:02][Zv1ts0pDpCSiTVoWc9WqmszXj5QUYSF6] Processing: Jobs\ThemeAssetUploading
[2023-04-17 09:53:07][Zv1ts0pDpCSiTVoWc9WqmszXj5QUYSF6] Processed:  Jobs\ThemeAssetUploading
[2023-04-17 09:53:07][K69thLwVkwnkOccdR778hDdMBAL7U4pD] Processing: Jobs\ThemeInstalled
[2023-04-17 09:53:07][K69thLwVkwnkOccdR778hDdMBAL7U4pD] Processed:  Jobs\ThemeInstalled
[2023-04-17 09:53:07][SJPEBLJozJygXiIW9zfJNU1FSGtBmWek] Processing: Jobs\ThemeInstalled
[2023-04-17 09:53:07][SJPEBLJozJygXiIW9zfJNU1FSGtBmWek] Processed:  Jobs\ThemeInstalled

[2023-04-17 14:02:50] local.INFO: destination {
    "id": 799,
    "destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/17/1681711238.5778.1671140645"
} 
[2023-04-17 14:02:54] local.INFO: destination {
    "id": 799,
    "destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/17/1681711238.5778.1671140645"
} 
[2023-04-17 14:02:56] local.INFO: destination {
    "id": 800,
    "destination": null
} 
[2023-04-17 14:02:57] local.INFO: destination {
    "id": 800,
    "destination": null
} 
[2023-04-17 14:02:57] local.INFO: destination {
    "id": 801,
    "destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/17/1681711324.896.2108597779"
} 
[2023-04-17 14:02:59] local.INFO: destination {
    "id": 801,
    "destination": "E:\\wwwroot\\object\\storage\\app/theme_downloads/2023/04/17/1681711324.896.2108597779"
}

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