如何使用高速公路异步实现交互式 websocket 客户端？

Question

我正在尝试使用 autobahn|python 实现 websocket/wamp 客户端 和asyncio，虽然它有点工作，但有些部分有 躲过了我。

我真正想做的是在 qt5/QML 中实现 WAMP，但这 目前看来是一条更容易的道路。

这个主要从网上复制的简化客户端确实有效。它读取 onJoin 发生时的时间服务。

我想做的是从外部源触发此读取。

我采用的复杂方法是​​在 线程，然后通过套接字发送命令以触发读取。一世 到目前为止无法弄清楚将例程/协程放在哪里 可以从阅读器例程中找到它。

我怀疑有更简单的方法可以解决这个问题，但我还没有找到 然而。欢迎提出建议。

#!/usr/bin/python3
try:
    import asyncio
except ImportError:
    ## Trollius >= 0.3 was renamed
    import trollius as asyncio

from autobahn.asyncio import wamp, websocket
import threading
import time
from socket import socketpair

rsock, wsock = socketpair()

def reader() :
    data = rsock.recv(100)
    print("Received:", data.decode())

class MyFrontendComponent(wamp.ApplicationSession):
    def onConnect(self):
        self.join(u"realm1")



    @asyncio.coroutine
    def onJoin(self, details):
        print('joined')
        ## call a remote procedure
        ##
        try:
           now = yield from self.call(u'com.timeservice.now')
        except Exception as e:
           print("Error: {}".format(e))
        else:
           print("Current time from time service: {}".format(now))



    def onLeave(self, details):
        self.disconnect()

    def onDisconnect(self):
        asyncio.get_event_loop().stop()



def start_aloop() :
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    transport_factory = websocket.WampWebSocketClientFactory(session_factory,
                    debug = False,
                    debug_wamp = False)
    coro = loop.create_connection(transport_factory, '127.0.0.1', 8080)
    loop.add_reader(rsock,reader)
    loop.run_until_complete(coro)
    loop.run_forever()
    loop.close()

if __name__ == '__main__':
    session_factory = wamp.ApplicationSessionFactory()
    session_factory.session = MyFrontendComponent

    ## 4) now enter the asyncio event loop
    print('starting thread')
    thread = threading.Thread(target=start_aloop)
    thread.start()
    time.sleep(5)
    print("IN MAIN")
    # emulate an outside call
    wsock.send(b'a byte string')

Answer 1

您可以使用loop.sock_accept 在事件循环内异步侦听套接字。你可以调用一个协程来设置onConnect或onJoin内部的socket：

try:
    import asyncio
except ImportError:
    ## Trollius >= 0.3 was renamed
    import trollius as asyncio

from autobahn.asyncio import wamp, websocket
import socket

class MyFrontendComponent(wamp.ApplicationSession):
    def onConnect(self):
        self.join(u"realm1")

    @asyncio.coroutine
    def setup_socket(self):
        # Create a non-blocking socket
        self.sock = socket.socket()
        self.sock.setblocking(0)
        self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.sock.bind(('localhost', 8889))
        self.sock.listen(5)
        loop = asyncio.get_event_loop()
        # Wait for connections to come in. When one arrives,
        # call the time service and disconnect immediately.
        while True:
            conn, address = yield from loop.sock_accept(self.sock)
            yield from self.call_timeservice()
            conn.close()

    @asyncio.coroutine
    def onJoin(self, details):
        print('joined')
        # Setup our socket server
        asyncio.async(self.setup_socket())

        ## call a remote procedure
        ##
        yield from self.call_timeservice()

    @asyncio.coroutine
    def call_timeservice(self):
        try:
           now = yield from self.call(u'com.timeservice.now')
        except Exception as e:
           print("Error: {}".format(e))
        else:
           print("Current time from time service: {}".format(now))

    ... # The rest is the same

Answer 2

感谢达诺的回复。不是我需要的解决方案，但它为我指明了正确的方向。是的，我希望客户端可以从外部触发器进行远程 RPC 调用。

我想出了以下方法，它允许我为特定调用传递一个字符串（尽管现在只实现了一个）

这是我想出的，虽然我不确定它有多优雅。

import asyncio
from autobahn.asyncio import wamp, websocket
import threading
import time
import socket


rsock, wsock = socket.socketpair()

class MyFrontendComponent(wamp.ApplicationSession):
    def onConnect(self):
        self.join(u"realm1")

    @asyncio.coroutine
    def setup_socket(self):
        # Create a non-blocking socket
        self.sock = rsock
        self.sock.setblocking(0)
        loop = asyncio.get_event_loop()
        # Wait for connections to come in. When one arrives,
        # call the time service and disconnect immediately.
        while True:
            rcmd = yield from loop.sock_recv(rsock,80)
            yield from self.call_service(rcmd.decode())

    @asyncio.coroutine
    def onJoin(self, details):
        # Setup our socket server
        asyncio.async(self.setup_socket())


    @asyncio.coroutine
    def call_service(self,rcmd):
        print(rcmd)
        try:
           now = yield from self.call(rcmd)
        except Exception as e:
           print("Error: {}".format(e))
        else:
           print("Current time from time service: {}".format(now))



    def onLeave(self, details):
        self.disconnect()

    def onDisconnect(self):
        asyncio.get_event_loop().stop()



def start_aloop() :
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    transport_factory = websocket.WampWebSocketClientFactory(session_factory,
                    debug = False,
                    debug_wamp = False)
    coro = loop.create_connection(transport_factory, '127.0.0.1', 8080)
    loop.run_until_complete(coro)
    loop.run_forever()
    loop.close()

if __name__ == '__main__':
    session_factory = wamp.ApplicationSessionFactory()
    session_factory.session = MyFrontendComponent

    ## 4) now enter the asyncio event loop
    print('starting thread')
    thread = threading.Thread(target=start_aloop)
    thread.start()
    time.sleep(5)
    wsock.send(b'com.timeservice.now')
    time.sleep(5)
    wsock.send(b'com.timeservice.now')
    time.sleep(5)
    wsock.send(b'com.timeservice.now')