Error using paho-mqtt in App Engine Python App
- by calumb
I am trying to right a Google Cloud Platform app in python with Flask that makes an MQTT connection. I have included the paho python library by doing pip install paho-mqtt -t libs/. However, when I try to run the app, even if I don't try to connect to MQTT. I get a weird error about IP address checking:
RuntimeError: error('illegal IP address string passed to inet_pton',)
It seems something in the remote_socket lib is causing a problem. Is this a security issue? Is there someway to disable it?
Relevant code:
from flask import Flask
import paho.mqtt.client as mqtt
import logging as logger
app = Flask(__name__)
# Note: We don't need to call run() since our application is embedded within
# the App Engine WSGI application server.
#callback to print out connection status
def on_connect(mosq, obj, rc):
logger.info('on_connect')
if rc == 0:
logger.info("Connected")
mqttc.subscribe('test', 0)
else:
logger.info(rc)
def on_message(mqttc, obj, msg):
logger.info(msg.topic+" "+str(msg.qos)+" "+str(msg.payload))
mqttc = mqtt.Client("mqttpy")
mqttc.on_message = on_message
mqttc.on_connect = on_connect
As well as full stack trace:
ERROR 2014-06-03 15:14:57,285 wsgi.py:262]
Traceback (most recent call last):
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/runtime/wsgi.py", line 239, in Handle
handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/runtime/wsgi.py", line 298, in _LoadHandler
handler, path, err = LoadObject(self._handler)
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/runtime/wsgi.py", line 84, in LoadObject
obj = __import__(path[0])
File "/Users/cbarnes/code/ignite/tank-demo/appengine-flask-demo/main.py", line 24, in <module>
mqttc = mqtt.Client("mqtthtpp")
File "/Users/cbarnes/code/ignite/tank-demo/appengine-flask-demo/lib/paho/mqtt/client.py", line 403, in __init__
self._sockpairR, self._sockpairW = _socketpair_compat()
File "/Users/cbarnes/code/ignite/tank-demo/appengine-flask-demo/lib/paho/mqtt/client.py", line 255, in _socketpair_compat
listensock.bind(("localhost", 0))
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/dist27/socket.py", line 222, in meth
return getattr(self._sock,name)(*args)
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/api/remote_socket/_remote_socket.py", line 668, in bind
self._SetProtoFromAddr(request.mutable_proxy_external_ip(), address)
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/api/remote_socket/_remote_socket.py", line 632, in _SetProtoFromAddr
proto.set_packed_address(self._GetPackedAddr(address))
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/api/remote_socket/_remote_socket.py", line 627, in _GetPackedAddr
AI_NUMERICSERV|AI_PASSIVE):
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/api/remote_socket/_remote_socket.py", line 338, in getaddrinfo
canonical=(flags & AI_CANONNAME))
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/api/remote_socket/_remote_socket.py", line 211, in _Resolve
canon, aliases, addresses = _ResolveName(name, families)
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/api/remote_socket/_remote_socket.py", line 229, in _ResolveName
apiproxy_stub_map.MakeSyncCall('remote_socket', 'Resolve', request, reply)
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 94, in MakeSyncCall
return stubmap.MakeSyncCall(service, call, request, response)
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 328, in MakeSyncCall
rpc.CheckSuccess()
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/api/apiproxy_rpc.py", line 156, in _WaitImpl
self.request, self.response)
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/ext/remote_api/remote_api_stub.py", line 200, in MakeSyncCall
self._MakeRealSyncCall(service, call, request, response)
File "/Users/cbarnes/google-cloud-sdk/platform/google_appengine/google/appengine/ext/remote_api/remote_api_stub.py", line 234, in _MakeRealSyncCall
raise pickle.loads(response_pb.exception())
RuntimeError: error('illegal IP address string passed to inet_pton',)
INFO 2014-06-03 15:14:57,291 module.py:639] default: "GET / HTTP/1.1" 500 -
Thanks!
