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我编写了一个多线程 web-socket 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-socket,我的进程也不会退出。我必须每次都做一个kill -9来摆脱它。我试着调用线程的join()方法以确保主线程等待子线程完成其执行,但这没有帮助。

代码如下所示。你能帮我优雅地退出/停止线程吗?

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...'
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1 回答 1

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总结通过我们在评论中的扩展讨论发现的解决方案(并让您有机会接受并投票赞成我的回答。;-)

要解决问题,您需要调用类的self.ws.close()方法,不仅仅是设置. 这样,网络套接字将被干净地关闭。WebSocketClientstop()self.ws.keep_running = False

我还建议您将线程的daemon属性设置为,True以便当主线程因任何原因终止时线程将自动停止——以防万一发生完全意外的事情。

于 2016-11-18T00:01:02.327 回答