带有Docker连接的Python Aiosmtpd服务器拒绝

Question

我试图开发一个测试电子邮件服务器，应该运行在一个码头容器。docker容器的运行方式是--network=host -P；但是对于单元测试，我想使用--network=none。

我故意指定应该使用端口0(让操作系统选择可用的端口)。然后，我有一个函数来获取实际使用的端口。服务器代码是

#! /usr/bin/env python3

import asyncio #pylint: disable=unused-import
from aiosmtpd.controller import Controller

class DemoEmailHandler:
    async def handle_DATA(self, server, session, envelope):
        message = {
            'peer' : session.peer,
            'mailfrom' : envelope.mail_from,
            'to': envelope.rcpt_tos,
            'data' : envelope.content}
        print(message)
        return '250 Message accepted for delivery'


class DemoEmailServer:
    def __init__(self):
        self._handler = DemoEmailHandler()
        self._server = Controller(
            handler=self._handler,
            hostname="0.0.0.0",
            port=0
        )
        self._server.start()
        self._port = self._server.server.sockets[0].getsockname()[1]

    def stop(self):
        """Tell the server to stop"""
        self._server.stop()

    def getPort(self) -> int:
        """Return the port the SMTP (email) server is actually on"""
        return self._port

SERVER = DemoEmailServer()
print(SERVER.getPort())
SERVER.stop()

我一直被拒绝了：

Traceback (most recent call last):
  File "./demo_email_server.py", line 36, in <module>
    SERVER = DemoEmailServer()
  File "./demo_email_server.py", line 25, in __init__
    self._server.start()
  File "/usr/local/lib/python3.8/dist-packages/aiosmtpd-1.4.2-py3.8.egg/aiosmtpd/controller.py", line 223, in start
    self._trigger_server()
  File "/usr/local/lib/python3.8/dist-packages/aiosmtpd-1.4.2-py3.8.egg/aiosmtpd/controller.py", line 313, in _trigger_server
    s = stk.enter_context(create_connection((hostname, self.port), 1.0))
  File "/usr/lib/python3.8/socket.py", line 808, in create_connection
    raise err
  File "/usr/lib/python3.8/socket.py", line 796, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

如果我使用s.bind(‘0.0.0.0’，0)创建一个没有拒绝连接的简单服务器套接字。

(我的主机和容器都是Ubuntu20.04，python 3.8.5，容器从源代码中安装了aiosmtpd 1.4.2 )。

有人能帮忙吗？

Answer 1

我认为您应该选择系统上可用的另一个端口。例如，尝试这种选择可用端口的方法：

导入套接字sock = socket.socket() sock.setsockopt(socket.SOL_SOCKET，socket.SO_REUSEADDR，1) sock.bind(“”，0)主机，端口= sock.getsockname()