python - 循环似乎打破了命名空间方法中的 "emit"事件 [gevent-socketio]

Question

几天以来，我一直在尝试在服务器端进行某种循环以允许我定期更新客户端，但没有成功，但似乎如果将循环放入服务器事件方法中，它就会停止自动向客户端发送事件。我的直觉是“gevent”(或 greenlets)不允许这种行为(只有客户端，使用 socket.io 的浏览器，可以定期向服务器发出，而不是相反)。我错了吗？你会如何解决这个问题？如果你做一个循环，与客户端(套接字)的连接是否有可能以某种方式丢失？我将附上一个带有架构的小草稿。

// Client (socket.io) [Javascript]

client = io.connect('/space');
client.on('do_something', function (msg) {
    // Do something.
});
client.on('do_another_thing', function (msg) {
   // Do another thing.
});
client.emit('something', msg);


# Server (gevent-socketio) [Python]

@namespace('/space')
class SpaceNamespace:
    def on_something(msg):
        # This WORKS just fine cause it's out the scope of the loop.
        self.emit('do_another_thing', some_operation(msg))
        # This DOES NOT work.
        while True:
            # Each 3 seconds update the client.
            self.emit('do_something', some_operation(msg))
            time.sleep(3)
            # If you put an ipdb here, you can see like the code
            # is executed, but the browser doesn't receive any
            # event.

谢谢!

Answer 1

您需要将 time.sleep(3) 更改为 gevent.sleep(3)，这是告诉单个 greenlet sleep 的方式。来自docs :

gevent.sleep(seconds=0) Put the current greenlet to sleep for at least seconds.

seconds may be specified as an integer, or a float if fractional seconds are desired. Calling sleep with seconds of 0 is the canonical way of expressing a cooperative yield.