定期检查网络服务器是否有线程

Question

我写了一个线程 class 来测试网络服务器是否启动。

import urllib
import threading
import time
import Queue

class Thread_CheckDeviceState(threading.Thread):


    def __init__(self, device_ip, queue, inter=0.1):

        self._run = True
        self._codes = {}
        self._queue = queue
        self._device_ip = device_ip
        self._inter = inter
        self._elapsed = 0

        threading.Thread.__init__(self)


    def stop(self):
        self._run = False


    def run(self):
        start = time.time()

        while self._run:
            try:
                code = urllib.urlopen(self._device_ip).getcode()
            except Exception:
                code = "nope"
            finally:
                measure = time.time()
                self._elapsed += measure-start

                print self._elapsed, code
                self._codes.update(
                    {self._elapsed:code}
                )

            time.sleep(self._inter)
        self._queue.put(self._codes)

q = Queue.Queue()
thread = Thread_CheckDeviceState("http://192.168.1.3", q)
thread.start()
time.sleep(10)
thread.stop()

print q.get()

它工作正常 - 直到我断开我的电脑与网络的连接。从那一刻起，线程在停止之前什么都不做。我希望它继续并将 code 设置为 "nope"，就像我在异常处理程序中写的那样。为什么不起作用

Answer 1

您需要使用urllib2，并在调用urlopen()时指定一个timeout参数。

定期检查网络服务器是否有线程

Regularly check whether a webserver is up with a Thread

python

exception-handling

urllib

python-multithreading