Question

我编写了一个多线程Web套接字客户端类，以便用户的（主）线程不会阻塞run_forever()方法调用。代码似乎工作正常，除了最后，当我停止线程时，它不会干净地关闭Web套接字，我的进程不会退出。每次我必须做kill -9才能摆脱它。我尝试调用线程的join()方法来确保主线程等待子进程完成执行，但这没有帮助。

代码如下所示。你能帮我把线程退出/停止优雅吗？

import thread
import threading
import time
import websocket

class WebSocketClient(threading.Thread):

    def __init__(self, url):
        self.url = url
        threading.Thread.__init__(self)

    def run(self):

        # Running the run_forever() in a seperate thread.
        #websocket.enableTrace(True)
        self.ws = websocket.WebSocketApp(self.url,
                                         on_message = self.on_message,
                                         on_error = self.on_error,
                                         on_close = self.on_close)
        self.ws.on_open = self.on_open
        self.ws.run_forever()

    def send(self, data):

        # Wait till websocket is connected.
        while not self.ws.sock.connected:
            time.sleep(0.25)

        print 'Sending data...', data
        self.ws.send("Hello %s" % data)

    def stop(self):
        print 'Stopping the websocket...'
        self.ws.keep_running = False

    def on_message(self, ws, message):
        print 'Received data...', message

    def on_error(self, ws, error):
        print 'Received error...'
        print error

    def on_close(self, ws):
        print 'Closed the connection...'

    def on_open(self, ws):
        print 'Opened the connection...'

if __name__ == "__main__":

    wsCli = WebSocketClient("ws://localhost:8888/ws")
    wsCli.start()
    wsCli.send('Hello')
    time.sleep(.1)
    wsCli.send('World')
    time.sleep(1)
    wsCli.stop()
    #wsCli.join()
    print 'After closing client...'

Answer 1

总结通过我们在评论中进行的扩展讨论所发现的解决方案（并让您有机会接受并推荐我的答案。; - ）

要解决此问题，您需要在self.ws.close()课程WebSocketClient方法而非中仅调用stop()来调用self.ws.keep_running = False 。这样，网络套接字就会干净利落。

我建议您还将线程的daemon属性设置为True，这样当主线程因任何原因终止时线程将自动停止 - 以防万一完全意外发生

多线程websocket客户端无法正常退出

1 个答案: