[Nodeshot] Circular Import Problem in Building Nodeshot in AWS

Nemesis nemesis at ninux.org
Mon Nov 2 19:57:13 CET 2015 

Sorry to disappoint you, that's not the right solution: nodeshot uses
postgis and requires the django postgis database backend to make
geographic queries. With that configuration some features won't work and
will crash the application with 500 Internal server error.

If you could reply to my previous questions I can understand if it's a
bug or a misconfiguration.

Federico


On 11/02/2015 05:26 PM, Hui Yu wrote:
> Thank you very much for quick response. I just found what's the real
> problem: in
> ./env/nodeshot/lib/python2.7/site-packages/django_hstore/query.py
> actually HStoreGeoQuerySet definition is under condition:
>
> if GEODJANGO_INSTALLED:
>
> which is defined in
> ./env/nodeshot/lib/python2.7/site-packages/django_hstore/apps.py that
> check if there's a "postgis" in database ENGINE setup of settings.py.
> So in case there's no "postgis" pattern in ENGINE string,
> HStoreGeoQuerySet is just got missed and it"s not a circular import
> problem.
>
> Then after I changed ENGINE from
> 'django.db.backends.postgresql_psycopg2' to
> 'django.contrib.gis.db.backends.postgis', everything worked perfectly
> and my nodeshot site is now up in AWS.
>
> Best regards,
> Hui Yu
>
> Nemesis さんは書きました:
>> Hi Hui Yu,
>>
>> this problem has not been reported yet.
>>
>> Could you tell us what procedure are you using to install nodeshot?
>> Automated or manual? Are you installing from git or pypi?
>>
>> Federico
>>
>>
>>
>> On 11/01/2015 04:16 AM, Hui Yu wrote:
>>> Dear all,
>>>
>>> I'm new in Python and Django development and trying to build a
>>> community website base on nodeshot on AWS Elastic BeanStalk. Source
>>> is from git clone https://github.com/ninuxorg/nodeshot.
>>>
>>> Also the build was successful on my local environment on Fedora 21
>>> with 2.7.8, I'm failing to build the same on Amazon Linux AMI with
>>> Python 2.7.9 due to some circular import problem in
>>> ./nodeshot/nodeshot/core/base/managers.py as following:
>>>
>>> (nodeshot)[ec2-user at ip-172-31-12-8 dev]$ python manage.py migrate
>>> --no-initial-data
>>> Traceback (most recent call last):
>>>   File "manage.py", line 10, in <module>
>>>     execute_from_command_line(sys.argv)
>>>   File
>>> "/home/ec2-user/works/nodeshot/env/nodeshot/local/lib/python2.7/site-packages/django/core/management/__init__.py",
>>> line 338, in execute_from_command_line
>>>     utility.execute()
>>>   File
>>> "/home/ec2-user/works/nodeshot/env/nodeshot/local/lib/python2.7/site-packages/django/core/management/__init__.py",
>>> line 312, in execute
>>>     django.setup()
>>>   File
>>> "/home/ec2-user/works/nodeshot/env/nodeshot/local/lib/python2.7/site-packages/django/__init__.py",
>>> line 18, in setup
>>>     apps.populate(settings.INSTALLED_APPS)
>>>   File
>>> "/home/ec2-user/works/nodeshot/env/nodeshot/local/lib/python2.7/site-packages/django/apps/registry.py",
>>> line 108, in populate
>>>     app_config.import_models(all_models)
>>>   File
>>> "/home/ec2-user/works/nodeshot/env/nodeshot/local/lib/python2.7/site-packages/django/apps/config.py",
>>> line 198, in import_models
>>>     self.models_module = import_module(models_module_name)
>>>   File "/usr/lib64/python2.7/importlib/__init__.py", line 37, in
>>> import_module
>>>     __import__(name)
>>>   File
>>> "/home/ec2-user/works/nodeshot/nodeshot/core/layers/models/__init__.py",
>>> line 8, in <module>
>>>     from layer import Layer
>>>   File
>>> "/home/ec2-user/works/nodeshot/nodeshot/core/layers/models/layer.py", line
>>> 10, in <module>
>>>     from nodeshot.core.nodes.models import Node
>>>   File
>>> "/home/ec2-user/works/nodeshot/nodeshot/core/nodes/models/__init__.py",
>>> line 1, in <module>
>>>     from .node import Node  # noqa
>>>   File
>>> "/home/ec2-user/works/nodeshot/nodeshot/core/nodes/models/node.py",
>>> line 8, in <module>
>>>     from nodeshot.core.base.managers import
>>> HStoreGeoAccessLevelPublishedManager as NodeManager
>>> *  File
>>> "/home/ec2-user/works/nodeshot/nodeshot/core/base/managers.py", line
>>> 6, in <module>
>>>     from django_hstore.query import HStoreQuerySet, HStoreGeoQuerySet
>>> ImportError: cannot import name HStoreGeoQuerySet*
>>>
>>> By looking into the code, it seems like the circular import happens
>>> between ./nodeshot/nodeshot/core/base/managers.py and query.py in
>>> HStore module (in my virtualenv environment
>>> ./env/nodeshot/lib/python2.7/site-packages/django_hstore/query.py),
>>> also the next line:
>>>
>>> from django_hstore.managers import HStoreManager, HStoreGeoManager
>>>
>>> also has the same problem on HStoreGeoManager with managers.py in
>>> HStore module (in my virtualenv environment
>>> ./env/nodeshot/lib/python2.7/site-packages/django_hstore/managers.py)
>>>
>>> The HStore version and version other components installed are as below:
>>> (nodeshot)[ec2-user at ip-172-31-12-8 dev]$ pip list
>>> You are using pip version 6.0.8, however version 7.1.2 is available.
>>> You should consider upgrading via the 'pip install --upgrade pip'
>>> command.
>>> amqp (1.4.7)
>>> anyjson (0.3.3)
>>> billiard (3.3.0.20)
>>> blessings (1.6)
>>> bpython (0.14.2)
>>> celery (3.1.18)
>>> curtsies (0.1.19)
>>> decorator (4.0.4)
>>> Django (1.8.4)
>>> django-appconf (1.0.1)
>>> django-celery-email (1.1.2)
>>> django-cors-headers (1.1.0)
>>> django-extensions (1.5.7)
>>> django-filebrowser (3.6.1)
>>> django-grappelli (2.7.1)
>>> *django-hstore (1.4)*
>>> django-leaflet (0.16.0)
>>> django-netfields (0.3.1)
>>> django-redis (4.2.0)
>>> django-rest-swagger (0.3.4)
>>> django-reversion (1.9.3)
>>> django-rosetta (0.7.6)
>>> django-smuggler (0.6.0)
>>> djangorestframework (3.2.3)
>>> djangorestframework-gis (0.9.4)
>>> *djangorestframework-hstore (1.3)*
>>> drf-extensions (0.2.7)
>>> ecdsa (0.13)
>>> geojson-elevation (0.1)
>>> greenlet (0.4.9)
>>> influxdb (2.9.2)
>>> jsonfield (1.0.3)
>>> kombu (3.0.28)
>>> libcnml (0.9.2)
>>> Markdown (2.6.2)
>>> microsofttranslator (0.5)
>>> mimeparse (0.1.3)
>>> msgpack-python (0.4.6)
>>> netaddr (0.7.18)
>>> netdiff (0.4.4)
>>> netengine (0.1a0)
>>> networkx (1.10)
>>> *nodeshot (1.0.pre-alpha, /home/ec2-user/works/nodeshot)*
>>> oauthlib (1.0.3)
>>> paramiko (1.15.3)
>>> Pillow (3.0.0)
>>> pip (6.0.8)
>>> ply (3.8)
>>> polib (1.0.7)
>>> psycopg2 (2.6.1)
>>> pyasn1 (0.1.9)
>>> pycrypto (2.6.1)
>>> Pygments (2.0.2)
>>> PyJWT (1.4.0)
>>> pysmi (0.0.6)
>>> pysnmp (4.3.0)
>>> python-dateutil (2.4.2)
>>> python-openid (2.2.5)
>>> python-social-auth (0.2.12)
>>> pytz (2015.6)
>>> PyYAML (3.11)
>>> raven (5.7.2)
>>> redis (2.10.3)
>>> requests (2.8.1)
>>> requests-oauthlib (0.5.0)
>>> setuptools (12.0.5)
>>> simplejson (3.8.0)
>>> six (1.9.0)
>>> tld (0.7.4)
>>>
>>> Could anyone please kindly advise if the same issue has been
>>> reported in the past and what were the solutions?
>>>
>>> Thanks & best regards,
>>> Hui Yu
>>>
>>>
>>> _______________________________________________
>>> Nodeshot mailing list
>>> Nodeshot at ml.ninux.org
>>> http://ml.ninux.org/mailman/listinfo/nodeshot
>>>     
>>
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