Aiohttp: Websocketクライアントがハング/ブロックしていますか？

短編小説

ws.receive()は、WebSocketからデータが流れているにもかかわらず、ハングしているように見えます。

期待される動作

ws.receiveは何かを出力して報告する必要があります。

実際の動作

WebSocketでハング/ブロックするだけです。

再現する手順

以下のコードは呼び出しコードです。

    async def _ws_subscribe(self,
                            session: ClientSession,
                            url: str
                            ) -> Dict:
        """ Fetch data from web socket asynchronously.

        This helper method fetches data from a web socket asynchronously. It is used to
        fetch subscribe to websockets of the SkyQ box.

        Args:
            session (aiohttp.ClientSession): Session to use when fetching the data.
            url (str): WebSocket URL to fetch.

        Returns:
            dict: The body of data returned.

        """
        LOGGER.debug(f"Inside _ws_subscribe()...")

        async with session.ws_connect(url, autoclose=False) as ws:
            while True:
                LOGGER.debug(f"Inside _ws_subscribe() infinite loop pre ws.receive.")
                payload = await ws.receive()
                LOGGER.debug(f"READ SOMETHING! _ws_subscribe() infinite loop post ws.receive")
                LOGGER.debug(f'type = {payload.type}')
                LOGGER.debug(f'payload data = {payload.data}')
                LOGGER.debug(f'payload exception = {ws.exception()}')
                if payload.type == aiohttp.WSMsgType.TEXT:
                    LOGGER.debug('Web-socket data received.')
                    asyncio.create_task(self._handle(payload))
                    # asyncio.ensure_future(self._handle(payload))
                elif payload.type == aiohttp.WSMsgType.BINARY:
                    LOGGER.debug('Web-socket binary data received.')
                elif payload.type == aiohttp.WSMsgType.PING:
                    LOGGER.debug('Web-socket ping received')
                    ws.pong()
                elif payload.type == aiohttp.WSMsgType.PONG:
                    LOGGER.debug('Web-socket pong received')
                else:
                    if payload.type == aiohttp.WSMsgType.CLOSE:
                        await ws.close()
                    elif payload.type == aiohttp.WSMsgType.ERROR:
                        LOGGER.info(f'Error during receive {ws.exception()}')
                    elif payload.type == aiohttp.WSMsgType.CLOSED:
                        pass

                    break

結果のログ：

(pyskyq-4vSEKDfZ) ✔ [brad<strong i="6">@bradmac</strong>:~/Code/pyskyq] [16-create-status-end-point-property|✚ 5…2] $ pyskyq -vv green
[2018-09-26 09:12:14] DEBUG:pyskyq.cli:Starting SkyQ...
[2018-09-26 09:12:14] DEBUG:pyskyq.skyremote:Initialised SkyRemote object with host=skyq, port=49160
[2018-09-26 09:12:14] DEBUG:pyskyq.status:Initialised Status object object with host=skyq, port=9006
[2018-09-26 09:12:14] DEBUG:asyncio:Using selector: KqueueSelector
[2018-09-26 09:12:14] DEBUG:pyskyq.status:Asyncio event loop thread running...
[2018-09-26 09:12:14] DEBUG:pyskyq.skyq:Initialised SkyQ object with host=skyq.
[2018-09-26 09:12:14] INFO:pyskyq.cli:Script ends here
[2018-09-26 09:12:14] DEBUG:pyskyq.status:Setting up web socket listener on ws://skyq:9006/as/system/status.
[2018-09-26 09:12:14] DEBUG:pyskyq.status:Inside _ws_subscribe()...
[2018-09-26 09:12:14] DEBUG:asyncio:Get address info skyq:9006, type=<SocketKind.SOCK_STREAM: 1>
[2018-09-26 09:12:14] DEBUG:asyncio:Getting address info skyq:9006, type=<SocketKind.SOCK_STREAM: 1> took 15.352ms: [(<AddressFamily.AF_INET: 2>, <SocketKind.SOCK_STREAM: 1>, 6, '', ('10.0.1.6', 9006))]
[2018-09-26 09:12:14] DEBUG:asyncio:poll 60478.847 ms took 14.299 ms: 1 events
[2018-09-26 09:12:14] DEBUG:asyncio:connect <socket.socket fd=8, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6, laddr=('0.0.0.0', 0)> to ('10.0.1.6', 9006)
[2018-09-26 09:12:14] DEBUG:asyncio:poll 60461.657 ms took 21.045 ms: 1 events
[2018-09-26 09:12:14] DEBUG:asyncio:<socket.socket fd=8, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=6, laddr=('10.0.1.30', 50141), raddr=('10.0.1.6', 9006)> connected to 10.0.1.6:9006: (<_SelectorSocketTransport fd=8 read=polling write=<idle, bufsize=0>>, <aiohttp.client_proto.ResponseHandler object at 0x1033c8ac8>)
[2018-09-26 09:12:14] DEBUG:asyncio:poll 60429.970 ms took 7.192 ms: 1 events
[2018-09-26 09:12:14] DEBUG:pyskyq.status:Inside _ws_subscribe() infinite loop pre ws.receive.

ただし、netcatで確認できるように、ソケットは開いており、データを提供しています。

(pyskyq-4vSEKDfZ) ✔ [brad<strong i="6">@bradmac</strong>:~/Code/pyskyq] [16-create-status-end-point-property|✚ 5…2] $ nc skyq 9006
GET /as/system/status HTTP/1.1
Host: skyq:9006
Accept: */*
Connection: Upgrade
Upgrade: websocket

�~�{
   "camessage" : {
      "reason" : "no message",
      "state" : "unavailable"
   },
   "drmstatus" : {
      "state" : "available"
   },
   "entitlements" : [
      "ANALYTICS",
      "BIGBASIC",
      "ETHAN_APP_1",
      "HD",
      "PDL",
      "SKY_DRM_CE",
      "SKY_DRM_MR",
      "SKY_IPPV",
      "ULTRA+",
      "SKY+",
      "GATEWAYENABLER",
      "SIDELOAD"
   ],
   "epginfobits" : {
      "epginfobits" : "0xFDE5FFC0",
      "mask" : "0x5FFA003F",
      "state" : "available"
   },
   "gatewayservices" : {
      "state" : "available"
   },
   "hdmi" : {
      "2160p10bitCapable" : false,
      "authenticatedHDCP" : "1.x",
      "sinkHDCP" : "1.x",
      "sinkHLG" : false,
      "sinkUHD" : false,
      "state" : "available",
      "uhdConfigured" : false
   },
   "network" : {
      "state" : "available"
   },
   "nssplayback" : {
      "state" : "available"
   },
   "pvr" : {
      "state" : "available"
   },
   "schedule" : {
      "lastdate" : "20181003",
      "state" : "available"
   },
   "servicelist" : {
      "state" : "available"
   },
   "smartcard" : {
      "active" : true,
      "bouquet" : "4101",
      "countryCode" : "GBR",
      "currency" : "GBP",
      "cwe" : true,
      "householdid" : "10947783",
      "paired" : true,
      "state" : "available",
      "subbouquet" : "1",
      "transactionlimit" : 65535,
      "viewingCardNumber" : "725 325 260"
   },
   "swupdate" : {
      "reason" : "IDLE",
      "state" : "unavailable"
   },
   "systemupdates" : {
      "entitlements" : 2,
      "install" : 1,
      "servicegenres" : 1,
      "smartcard" : 1
   },
   "updatetask" : {
      "reason" : "no update",
      "state" : "unavailable"
   }
}
^C(pyskyq-4vSEKDfZ) ✔ [brad<strong i="7">@bradmac</strong>:~/Code/pyskyq] [16-create-status-end-point-property|✚ 5…2] $

あなたの環境

(pyskyq-4vSEKDfZ) ✔ [brad<strong i="6">@bradmac</strong>:~/Code/pyskyq] [16-create-status-end-point-property|✚ 5…2] $ uname -a
Darwin bradmac 17.7.0 Darwin Kernel Version 17.7.0: Thu Jun 21 22:53:14 PDT 2018; root:xnu-4570.71.2~1/RELEASE_X86_64 x86_64
(pyskyq-4vSEKDfZ) ✔ [brad<strong i="7">@bradmac</strong>:~/Code/pyskyq] [16-create-status-end-point-property|✚ 5…2] $ pip freeze
aiohttp==3.4.4
appnope==0.1.0
arrow==0.12.1
async-timeout==3.0.0
async-upnp-client==0.12.4
attrs==18.2.0
backcall==0.1.0
binaryornot==0.4.4
bleach==2.1.3
certifi==2018.4.16
chardet==3.0.4
click==6.7
cookiecutter==1.6.0
cycler==0.10.0
decorator==4.3.0
Django==2.1.1
entrypoints==0.2.3
ez-setup==0.9
future==0.16.0
html5lib==1.0.1
idna==2.7
idna-ssl==1.1.0
ipykernel==4.8.2
ipython==6.4.0
ipython-genutils==0.2.0
ipywidgets==7.2.1
jedi==0.12.0
Jinja2==2.10
jinja2-time==0.2.0
jsonschema==2.6.0
jupyter==1.0.0
jupyter-client==5.2.3
jupyter-console==5.2.0
jupyter-core==4.4.0
kaggle==1.4.2
kiwisolver==1.0.1
MarkupSafe==1.0
matplotlib==2.2.2
mistune==0.8.3
multidict==4.4.2
nbconvert==5.3.1
nbformat==4.4.0
notebook==5.5.0
numpy==1.14.4
pandocfilters==1.4.2
parso==0.2.1
pexpect==4.6.0
pickleshare==0.7.4
pipenv==2018.7.1
poyo==0.4.1
prompt-toolkit==1.0.15
ptyprocess==0.6.0
Pygments==2.2.0
pyparsing==2.2.0
PyScaffold==3.0.3
python-dateutil==2.7.3
python-didl-lite==1.1.0
pytz==2018.4
pyzmq==17.0.0
qtconsole==4.3.1
requests==2.19.1
Send2Trash==1.5.0
simplegeneric==0.8.1
six==1.11.0
terminado==0.8.1
testpath==0.3.1
tornado==5.0.2
tqdm==4.24.0
traitlets==4.3.2
urllib3==1.22
virtualenv==16.0.0
virtualenv-clone==0.3.0
voluptuous==0.11.5
wcwidth==0.1.7
webencodings==0.5.1
whichcraft==0.4.1
widgetsnbextension==3.2.1
yarl==1.2.6
(pyskyq-4vSEKDfZ) ✔ [brad<strong i="8">@bradmac</strong>:~/Code/pyskyq] [16-create-status-end-point-property|✚ 5…2] $

更新...

Pythonのバージョンは3.7.0です