6

我正在尝试编写一个程序来与我创建的服务器建立大量网络套接字连接：

class WebSocketClient():

    @asyncio.coroutine
    def run(self):
        print(self.client_id, 'Connecting')
        ws = yield from aiohttp.ws_connect(self.url)
        print(self.client_id, 'Connected')
        print(self.client_id, 'Sending the message')
        ws.send_str(self.make_new_message())

        while not ws.closed:
            msg = yield from ws.receive()

            if msg.tp == aiohttp.MsgType.text:
                print(self.client_id, 'Received the echo')
                yield from ws.close()
                break

        print(self.client_id, 'Closed')


@asyncio.coroutine
def make_clients():

    for client_id in range(args.clients):
        yield from WebSocketClient(client_id, WS_CHANNEL_URL.format(client_id=client_id)).run()


event_loop.run_until_complete(make_clients())

问题是所有的客户一个接一个地做他们的工作：

0 Connecting
0 Connected
0 Sending the message
0 Received the echo
0 Closed
1 Connecting
1 Connected
1 Sending the message
1 Received the echo
1 Closed
...

我尝试过使用asyncio.wait，但所有客户端都是一起开始的。我希望它们逐渐创建并在每个创建后立即连接到服务器。同时继续创造新客户。

我应该采用什么方法来实现这一点？

4

1 回答 1

9

使用asyncio.wait是一个好方法。您可以将它与asyncio.ensure_future和asyncio.sleep结合使用以逐步创建任务：

@asyncio.coroutine
def make_clients(nb_clients, delay):
    futures = []
    for client_id in range(nb_clients):
        url = WS_CHANNEL_URL.format(client_id=client_id)
        coro = WebSocketClient(client_id, url).run()
        futures.append(asyncio.ensure_future(coro))
        yield from asyncio.sleep(delay)
    yield from asyncio.wait(futures)

编辑：我实现了一个FutureSet应该做你想做的事。该集合可以填充期货并在完成后自动删除它们。也可以等待所有期货完成。

class FutureSet:

    def __init__(self, maxsize, *, loop=None):
        self._set = set()
        self._loop = loop
        self._maxsize = maxsize
        self._waiters = []

    @asyncio.coroutine
    def add(self, item):
        if not asyncio.iscoroutine(item) and \
           not isinstance(item, asyncio.Future):
            raise ValueError('Expecting a coroutine or a Future')
        if item in self._set:
            return
        while len(self._set) >= self._maxsize:
            waiter = asyncio.Future(loop=self._loop)
            self._waiters.append(waiter)
            yield from waiter
        item = asyncio.async(item, loop=self._loop)    
        self._set.add(item)
        item.add_done_callback(self._remove)

    def _remove(self, item):
        if not item.done():
            raise ValueError('Cannot remove a pending Future')
        self._set.remove(item)
        if self._waiters:
            waiter = self._waiters.pop(0)
            waiter.set_result(None)

    @asyncio.coroutine
    def wait(self):
        return asyncio.wait(self._set)

例子：

@asyncio.coroutine
def make_clients(nb_clients, limit=0):
    futures = FutureSet(maxsize=limit)
    for client_id in range(nb_clients):
        url = WS_CHANNEL_URL.format(client_id=client_id)
        client = WebSocketClient(client_id, url)
        yield from futures.add(client.run())
    yield from futures.wait()
于 2015-10-16T14:35:44.447 回答