AttributeError: 'NoneType' object has no attribute 'is_caching_enabled'

[Arcturus122]

Good Morning !

Arctic Version

1.79.4

Arctic Store

not needed because only at connection and list_libraries() level

Platform and version

PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

Description of problem and/or code sample that reproduces the issue

python code app.py

from flask import Flask
from flask import request, jsonify
from random import sample
from arctic import Arctic

server = Flask(__name__)

conn = Arctic(
    'mongodb://******:******@<IP ADRESS>:27017/?authSource=admin')


def run_request():
    index = int(request.json['index'])
    list = ['red', 'green', 'blue', 'yellow', 'black']
    return list[index]


@server.route('/', methods=['GET', 'POST'])
def hello_world():
    if request.method == 'GET':
        return 'it works !'
    else:
        return run_request()


@server.route('/libraries')
def libraries():
    return jsonify(
        status=200,
        message=conn.list_libraries()
    )

python code wsgi.py

from app import server

if __name__ == "__main__":
    server.run(host='0.0.0.0', port=8000, debug=True)

my mongodb is in a docker and I am using directly root credentials to connect with the Arctic object in order to debug

when requesting the '/' route, there is no problem I get the 'It works !' message but when requesting the '/libraries' route
conn.list_libraries() return this error :

[2021-01-26 07:36:13,324] ERROR in app: Exception on /libraries [GET]
flask_app | Traceback (most recent call last):
flask_app | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 2447, in wsgi_app
flask_app | response = self.full_dispatch_request()
flask_app | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1952, in full_dispatch_request
flask_app | rv = self.handle_user_exception(e)
flask_app | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1821, in handle_user_exception
flask_app | reraise(exc_type, exc_value, tb)
flask_app | File "/usr/local/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise
flask_app | raise value
flask_app | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1950, in full_dispatch_request
flask_app | rv = self.dispatch_request()
flask_app | File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1936, in dispatch_request
flask_app | return self.view_functionsrule.endpoint
flask_app | File "/usr/src/flask_app/app.py", line 29, in libraries
flask_app | message=conn.list_libraries()
flask_app | File "/usr/local/lib/python3.6/site-packages/arctic/arctic.py", line 206, in list_libraries
flask_app | return self._list_libraries_cached(newer_than_secs) if self.is_caching_enabled() else self._list_libraries()
flask_app | File "/usr/local/lib/python3.6/site-packages/arctic/arctic.py", line 198, in is_caching_enabled
flask_app | return self._cache.is_caching_enabled(ENABLE_CACHE)
nginx | 77.198.248.231 - - [26/Jan/2021:07:36:13 +0000] "GET /libraries HTTP/1.1" 500 290 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.2 Safari/605.1.15" "-"
flask_app | AttributeError: 'NoneType' object has no attribute 'is_caching_enabled'

Many thanks in advance !

Arcturus122

[shashank88]

I was meaning to take a look at this, leave it with me for now, will take a look over the weekend.

[shashank88]

#892 should fix it @Arcturus122