如何创建一个自我更新的Node.js应用程序? [英] How to create a self-updating Node.js application?

问题描述

我想用Node.js创建一个应用程序，该应用程序会定期检查更新并安装更新(如果有的话).

I'd like to create an application with Node.js that periodically checks for updates and installs them if there are any.

基本组件对我来说很清楚:

The basic components are clear to me:

• 包含更新程序包的Web服务器(或FTP服务器，文件系统等)
• 一个版本系统(例如SemVer)，以便您可以判断哪个软件包是较新的
• 用于签名更新程序包的公钥算法

然后，何时检查更新和安装更新可能有不同的策略:

Then, there may be different strategies on when to check for updates and install updates:

• 启动应用程序
• 在应用程序结束时
• 闲置时

该应用程序甚至可能被硬关闭并自动重新启动.

The application may even be shut down hard and restarted automatically.

但是还有一些问题:

• npm上是否有任何模块已经提供了这样的系统?
• 如何在文件系统中组织不同的版本?基本上，您将拥有一个主机和多个(版本化)内核.所有的文件夹都应该有一个data文件夹吗?
• 如何处理npm install&公司新下载的软件包?
• 如何处理损坏的更新?
• 如何实现与Heroku&兼容的东西?公司没有永久性驱动器的地方?

• Is there any module on npm available that already provides such a system?
• How to organize the different versions in the file system? Basically you'd have a host and multiple (versioned) cores. Should there be one data folder for all of them?
• How to deal with npm install & co. for newly downloaded packages?
• How to deal with broken updates?
• How could you implement such a thing so that it's compatible to Heroku & co. where you don't have a permanent drive that you can drive to?

通常:您将如何实现这样的系统?

In general: How would you try to achieve a system like this?

推荐答案

首先，您可以将NPM本身用于打包和应用交付.其次，您可以添加一个脚本文件，以便在package.json文件(例如"postinstall"或"update")中添加cron作业，以进行定期更新.在此脚本中，您可以检查所有需要的内容，如损坏的更新.在Heroku中，您可以使用Scheduler Worker进行更新处理.

First, you could use NPM itself for package and app delivery. Second, you could add a script file to add a cron job in the package.json file (e.g. 'postinstall' or 'update') for a periodic update process. In this script you could check all you need like broken updates. In Heroku you can use a Scheduler Worker for update processing.

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