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python - 将 Autobahn|Python 与 aiohttp 集成

转载 作者:行者123 更新时间:2023-12-05 06:39:02 66 4
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我正在尝试将 aiohttp 网络服务器集成到 Crossbar+Autobahn 系统架构中。

更详细地说,当aiohttp 服务器收到某个API 调用时,它必须向Crossbar 路由器发布消息。我看过this example在官方 repo 协议(protocol)上,但我不知道如何将它集成到我的应用程序中。

理想情况下,我希望能够做到这一点

# class SampleTaskController(object):
async def handle_get_request(self, request: web.Request) -> web.Response:
self.publisher.publish('com.myapp.topic1', 'Hello World!')
return web.HTTPOk()

其中 selfSampleTaskController(object) 的实例,它定义了网络服务器的所有路由处理程序。

def main(argv):
cfg_path = "./task_cfg.json"
if len(argv) > 1:
cfg_path = argv[0]

logging.basicConfig(level=logging.DEBUG,
format=LOG_FORMAT)

loop = zmq.asyncio.ZMQEventLoop()
asyncio.set_event_loop(loop)

app = web.Application(loop=loop)
with open(cfg_path, 'r') as f:
task_cfg = json.load(f)
task_cfg['__cfg_path'] = cfg_path
controller = SampleTaskController(task_cfg)
controller.restore()
app['controller'] = controller

controller.setup_routes(app)

app.on_startup.append(controller.on_startup)
app.on_cleanup.append(controller.on_cleanup)
web.run_app(app,
host=task_cfg['webserver_address'],
port=task_cfg['webserver_port'])

请注意,我使用的是 zmq.asyncio.ZMQEventLoop,因为服务器也在监听 zmq 套接字,该套接字是在 Controller 中配置的。 on_startup 方法。

我还尝试使用 wampy 将消息发布到 Crossbar,而不是使用高速公路,它工作正常,但高速公路订阅者无法正确解析消息。

# autobahn subscriber
class ClientSession(ApplicationSession):
async def onJoin(self, details):

self.log.info("Client session joined {details}", details=details)

self.log.info("Connected: {details}", details=details)

self._ident = details.authid
self._type = u'Python'

self.log.info("Component ID is {ident}", ident=self._ident)
self.log.info("Component type is {type}", type=self._type)

# SUBSCRIBE

def gen_on_something(thing):
def on_something(counter, id, type):
print('----------------------------')
self.log.info("'on_{something}' event, counter value: {message}",something=thing, message=counter)
self.log.info("from component {id} ({type})", id=id, type=type)
return on_something

await self.subscribe(gen_on_something('landscape'), 'landscape')
await self.subscribe(gen_on_something('nature'), 'nature')

-

# wampy publisher
async def publish():
router = Crossbar(config_path='./crossbar.json')
logging.getLogger().debug(router.realm)
logging.getLogger().debug(router.url)
logging.getLogger().debug(router.port)

client = Client(router=router)
client.start()

result = client.publish(topic="nature", message=0)
logging.getLogger().debug(result)

使用此配置,订阅者接收发布的消息,但在解析消息时出现异常。

TypeError: on_something() got an unexpected keyword argument 'message'

最佳答案

最近我尝试同时使用aiohttp 和autobahn。我重新编写了 crossbar 文档中的示例(最初使用 twisted)并获得了以下代码:

import asyncio
import logging

from aiohttp import web
from aiohttp.web_exceptions import HTTPOk, HTTPInternalServerError
from autobahn.asyncio.component import Component

# Setup logging
logger = logging.getLogger(__name__)


class WebApplication(object):
"""
A simple Web application that publishes an event every time the
url "/" is visited.
"""

count = 0

def __init__(self, app, wamp_comp):
self._app = app
self._wamp = wamp_comp
self._session = None # "None" while we're disconnected from WAMP router

# associate ourselves with WAMP session lifecycle
self._wamp.on('join', self._initialize)
self._wamp.on('leave', self._uninitialize)

self._app.router.add_get('/', self._render_slash)

def _initialize(self, session, details):
logger.info("Connected to WAMP router (session: %s, details: %s)", session, details)
self._session = session

def _uninitialize(self, session, reason):
logger.warning("Lost WAMP connection (session: %s, reason: %s)", session, reason)
self._session = None

async def _render_slash(self, request):
if self._session is None:
return HTTPInternalServerError(reason="No WAMP session")
self.count += 1
self._session.publish(u"com.myapp.request_served", self.count, count=self.count)
return HTTPOk(text="Published to 'com.myapp.request_served'")


def main():
REALM = "crossbardemo"
BROKER_URI = "ws://wamp_broker:9091/ws"
BIND_ADDR = "0.0.0.0"
BIND_PORT = 8080

logging.basicConfig(
level='DEBUG',
format='[%(asctime)s %(levelname)s %(name)s:%(lineno)d]: %(message)s')

logger.info("Starting aiohttp backend at %s:%s...", BIND_ADDR, BIND_PORT)
loop = asyncio.get_event_loop()

component = Component(
transports=BROKER_URI,
realm=REALM,
)
component.start(loop=loop)

# When not using run() we also must start logging ourselves.
import txaio
txaio.start_logging(level='info')

app = web.Application(
loop=loop)

_ = WebApplication(app, component)

web.run_app(app, host=BIND_ADDR, port=BIND_PORT)


if __name__ == '__main__':
main()

关于python - 将 Autobahn|Python 与 aiohttp 集成,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45188506/

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