使connect（）尝试速度过快时出现套接字OSError [WinError 10022]

Question

我有一个客户端，需要反复轮询以查看期望的服务器是否在那里，并优雅​​地处理一个事实，即它可能不在很长一段时间内。

看下面的测试脚本：

import socket, time

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(0.1)

delay = 2
connected = False

while not connected:
    try:
        s.connect(("localhost", 50000))    # I'm running my test server locally
        connected = True

    except socket.timeout:
        print("Timed out. Waiting " + str(round(delay, 1)) + "s before next attempt.")
        time.sleep(delay)
        delay -= 0.1

结果：

Timed out. Waiting 2s before next attempt.
Timed out. Waiting 1.9s before next attempt.
Timed out. Waiting 1.8s before next attempt.
Timed out. Waiting 1.7s before next attempt.
Timed out. Waiting 1.6s before next attempt.
Timed out. Waiting 1.5s before next attempt.
Timed out. Waiting 1.4s before next attempt.
Timed out. Waiting 1.3s before next attempt.
Timed out. Waiting 1.2s before next attempt.
Timed out. Waiting 1.1s before next attempt.
Timed out. Waiting 1.0s before next attempt.
Timed out. Waiting 0.9s before next attempt.
Traceback (most recent call last):
  File "C:/Users/Lewis/Desktop/sockettest.py", line 11, in <module>
    s.connect(("localhost", 50000))
OSError: [WinError 10022] An invalid argument was supplied

看来，如果我在我的connect（）尝试之间没有放置大约0.9s的延迟，则会出现此异常。

到底是怎么回事？

Answer 1

您正在为每个“尝试”连接使用一个套接字。 一个插座只能用于一个连接。 您实际上只在这里进行一次连接尝试。 当它最终超时时，套接字将进入不允许再调用connect 。

为您要尝试的每个新连接尝试创建一个新套接字。