使用不阻塞地运行多个应用程序会话autbahn.asyncio.wamp

Question

我试图同时在python中运行两个autobahn.asyncio.wamp.ApplicationSession。以前，我使用了对autobahn库的修改，如this post's answer中所建议的那样。我现在 需要更专业的解决方案。在

在搜索了一段时间后，this post appeared quite promising，但是使用了twisted库，而不是{}。我无法为autobahn库的asyncio分支找到类似的解决方案，因为它似乎没有使用Reactors。在

我的主要问题是ApplicationRunner.run()是阻塞的（这就是我之前将它外包给线程的原因），所以我不能在它之后运行第二个ApplicationRunner。在

我确实需要同时访问2个websocket频道，这似乎不能用一个ApplicationSession来完成。在

目前我的代码：

from autobahn.asyncio.wamp import ApplicationSession
from autobahn.asyncio.wamp import ApplicationRunner
from asyncio import coroutine
import time


channel1 = 'BTC_LTC'
channel2 = 'BTC_XMR'

class LTCComponent(ApplicationSession):

    def onConnect(self):
        self.join(self.config.realm)

    @coroutine
    def onJoin(self, details):
        def onTicker(*args, **kwargs):
            print('LTCComponent', args, kwargs)

        try:
            yield from self.subscribe(onTicker, channel1)
        except Exception as e:
            print("Could not subscribe to topic:", e)

class XMRComponent(ApplicationSession):

    def onConnect(self):
        self.join(self.config.realm)

    @coroutine
    def onJoin(self, details):
        def onTicker(*args, **kwargs):
            print('XMRComponent', args, kwargs)

        try:
            yield from self.subscribe(onTicker, channel2)
        except Exception as e:
            print("Could not subscribe to topic:", e)

def main():
    runner = ApplicationRunner("wss://api.poloniex.com:443", "realm1", extra={})
    runner.run(LTCComponent)
    runner.run(XMRComponent) # <- is not being called


if __name__ == "__main__":

    try:
        main()
    except keyboardInterrupt:
        quit()

    except Exception as e:
        print(time.time(), e)

我对autobahn库的了解是有限的，恐怕文档并不能改善我的状况。我是不是在看什么？一个函数，一个参数，它能让我组合我的组件或者同时运行它们？在

也许是一个类似于provided here的解决方案，它实现了一个可选的ApplicationRunner？在

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相关主题

Running two ApplicationSessions in twisted

Running Autobahn ApplicationRunner in Thread

Autobahn.wamp.ApplicationSession Source

Autobahn.wamp.Applicationrunner Source

---

根据要求，使用multithreading代码从@stovfl的答案进行回溯：

^{pr2}$

Answer 1

正如我从traceback中看到的，我们只到达第2步，共4步

From the asyncio docs:
This module provides infrastructure for writing single-threaded concurrent code using coroutines, multiplexing I/O access over sockets and other resources

因此，我放弃了我的第一个建议使用multithreading。
我可以想象以下三种选择：

1. 用multiprocessing代替multithreading
2. 用coroutine在asyncio loop内完成
3. 在def onJoin(self, details)中的channels之间切换

---

第二个建议，第一个选项使用multiprocessing。
我可以启动两个asyncio loops，所以appRunner.run(...)应该可以工作。在

如果channel是唯一不同的，那么可以使用一个class ApplicationSession。 如果需要传递不同的class ApplicationSession，请将其添加到args=

class __ApplicationSession(ApplicationSession):
        # ...
        try:
            yield from self.subscribe(onTicker, self.config.extra['channel'])
        except Exception as e:
            # ...

import multiprocessing as mp
import time

def ApplicationRunner_process(realm, channel):
        appRunner = ApplicationRunner("wss://api.poloniex.com:443", realm, extra={'channel': channel})
        appRunner.run(__ApplicationSession)

if __name__ == "__main__":
    AppRun = [{'process':None, 'channel':'BTC_LTC'},
              {'process': None, 'channel': 'BTC_XMR'}]

    for app in AppRun:
        app['process'] =  mp.Process(target = ApplicationRunner_process, args = ('realm1', app['channel'] ))
        app['process'].start()
        time.sleep(0.1)

    AppRun[0]['process'].join()
    AppRun[1]['process'].join()

Answer 2

按照这个方法you linked for twisted我设法用asyncio settingstart_loop=False获得相同的行为

import asyncio
from autobahn.asyncio.wamp import ApplicationSession, ApplicationRunner

runner1 = ApplicationRunner(url, realm, extra={'cli_id': 1})
coro1 = runner1.run(MyApplicationSession, start_loop=False)

runner2 = ApplicationRunner(url, realm, extra={'cli_id': 2})
coro2 = runner2.run(MyApplicationSession, start_loop=False)

asyncio.get_event_loop().run_until_complete(coro1)
asyncio.get_event_loop().run_until_complete(coro2)
asyncio.get_event_loop().run_forever()

class MyApplicationSession(ApplicationSession):

    def __init__(self, cfg):
        super().__init__(cfg)
        self.cli_id = cfg.extra['cli_id']

   def onJoin(self, details):
        print("session attached", self.cli_id)