Django：服务器退出时如何运行函数？ [英] Django: How to run a function when server exits?

问题描述

我正在编写一个Django项目，其中使用Popen打开了多个进程。现在，当服务器退出时，这些进程将被孤立。我有一个终止这些进程的功能，并且希望对其进行组织，以便在服务器退出时自动调用此功能。

I am writing a Django project where several processes are opened using Popen. Right now, when the server exits, these processes are orphaned. I have a function to terminate these processes, and I wish to organise it so that this function is called automatically when the server quits.

任何帮助将不胜感激。

推荐答案

没有指定要使用的HTTP服务器（uWSGI，nginx，apache等），您可以在简单的开发服务器上测试此配方。

Since you haven't specified which HTTP server you are using (uWSGI, nginx, apache etc.), you can test this recipe out on a simple dev server.

可以尝试的方法通过 atexit 注册清除功能模块，将在进程终止时调用。您可以通过覆盖django内置的 runserver 命令轻松完成此操作。

What you can try is to register a cleanup function via atexit module that will be called at process termination. You can do this easily by overriding django's builtin runserver command.

创建一个名为 runserver.py的文件并将其放在 $ PATH_TO_YOUR_APP / management / commands / 目录中。

Create a file named runserver.py and put that in $PATH_TO_YOUR_APP/management/commands/ directory.

假设 PROCESSES_TO_KILL 是一个全局列表，其中包含对孤儿进程的引用，这些孤儿进程将在服务器终止时终止。

Assuming PROCESSES_TO_KILL is a global list holding references to orphan processes that will be killed upon server termination.

import atexit
import signal
import sys

from django.core.management.commands.runserver import BaseRunserverCommand

class NewRunserverCommand(BaseRunserverCommand):
    def __init__(self, *args, **kwargs):
        atexit.register(self._exit)
        signal.signal(signal.SIGINT, self._handle_SIGINT)
        super(Command, self).__init__(*args, **kwargs)

    def _exit(self):
        for process in PROCESSES_TO_KILL:
            process.terminate()

    def _handle_SIGINT(signal, frame):
        self._exit()
        sys.exit(0)

请注意这对于正常终止脚本很有用，但是在所有情况下都不会被调用（例如致命的内部错误）。

Just be aware that this works great for normal termination of the script, but it won't get called in all cases (e.g. fatal internal errors).

希望这会有所帮助。

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