Problems with ImportError: cannot import name interfaces on Ubuntu 10.04 apache WSGI deployment

[Shane]

Hello,

I am testing the deployment of an application under:

Ubuntu: 10.04
TG2.2.0
Apache/2.2.14 (Ubuntu) mod_wsgi/2.8

Intermittently (say every 48 hours of so), the app crashes with the following:

[Sun Dec 09 14:37:49 2012] [error] mod_wsgi (pid=23383): Target WSGI script '/usr/local/pythonenv/TG2.2ENV/MyAPP-R2.2.1/apache/MyAPP.wsgi' cannot be loaded as Python module.
[Sun Dec 09 14:37:49 2012] [error] mod_wsgi (pid=23383): Exception occurred processing WSGI script '/usr/local/pythonenv/TG2.2ENV/MyAPP-R2.2.1/apache/MyAPP.wsgi'.
[Sun Dec 09 14:37:49 2012] [error] Traceback (most recent call last):
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/MyAPP-R2.2.1/apache/MyAPP.wsgi", line 49, in <module>
[Sun Dec 09 14:37:49 2012] [error] application = loadapp('config:/usr/local/pythonenv/TG2.2ENV/MyAPP-R2.2.1/alpha-production.ini')
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/PasteDeploy-1.5.0-py2.7.egg/paste/deploy/loadwsgi.py", line 247, in loadapp
[Sun Dec 09 14:37:49 2012] [error] return loadobj(APP, uri, name=name, **kw)
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/PasteDeploy-1.5.0-py2.7.egg/paste/deploy/loadwsgi.py", line 271, in loadobj
[Sun Dec 09 14:37:49 2012] [error] global_conf=global_conf)
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/PasteDeploy-1.5.0-py2.7.egg/paste/deploy/loadwsgi.py", line 296, in loadcontext
[Sun Dec 09 14:37:49 2012] [error] global_conf=global_conf)
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/PasteDeploy-1.5.0-py2.7.egg/paste/deploy/loadwsgi.py", line 320, in _loadconfig
[Sun Dec 09 14:37:49 2012] [error] return loader.get_context(object_type, name, global_conf)
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/PasteDeploy-1.5.0-py2.7.egg/paste/deploy/loadwsgi.py", line 454, in get_context
[Sun Dec 09 14:37:49 2012] [error] section)
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/PasteDeploy-1.5.0-py2.7.egg/paste/deploy/loadwsgi.py", line 476, in _context_from_use
[Sun Dec 09 14:37:49 2012] [error] object_type, name=use, global_conf=global_conf)
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/PasteDeploy-1.5.0-py2.7.egg/paste/deploy/loadwsgi.py", line 406, in get_context
[Sun Dec 09 14:37:49 2012] [error] global_conf=global_conf)
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/PasteDeploy-1.5.0-py2.7.egg/paste/deploy/loadwsgi.py", line 296, in loadcontext
[Sun Dec 09 14:37:49 2012] [error] global_conf=global_conf)
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/PasteDeploy-1.5.0-py2.7.egg/paste/deploy/loadwsgi.py", line 328, in _loadegg
[Sun Dec 09 14:37:49 2012] [error] return loader.get_context(object_type, name, global_conf)
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/PasteDeploy-1.5.0-py2.7.egg/paste/deploy/loadwsgi.py", line 620, in get_context
[Sun Dec 09 14:37:49 2012] [error] object_type, name=name)
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/PasteDeploy-1.5.0-py2.7.egg/paste/deploy/loadwsgi.py", line 646, in find_egg_entry_point
[Sun Dec 09 14:37:49 2012] [error] possible.append((entry.load(), protocol, entry.name))
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/BASELINE2.7/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/pkg_resources.py", line 1954, in load
[Sun Dec 09 14:37:49 2012] [error] entry = __import__(self.module_name, globals(),globals(), ['__name__'])
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/MyAPP-R2.2.1/MyAPP/config/middleware.py", line 4, in <module>
[Sun Dec 09 14:37:49 2012] [error] from MyAPP.config.app_cfg import base_config
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/MyAPP-R2.2.1/MyAPP/config/app_cfg.py", line 19, in <module>
[Sun Dec 09 14:37:49 2012] [error] from MyAPP import model
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/MyAPP-R2.2.1/MyAPP/model/__init__.py", line 4, in <module>
[Sun Dec 09 14:37:49 2012] [error] from zope.sqlalchemy import ZopeTransactionExtension
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/zope.sqlalchemy-0.7.1-py2.7.egg/zope/sqlalchemy/__init__.py", line 17, in <module>
[Sun Dec 09 14:37:49 2012] [error] from zope.sqlalchemy.datamanager import ZopeTransactionExtension, mark_changed
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/zope.sqlalchemy-0.7.1-py2.7.egg/zope/sqlalchemy/datamanager.py", line 15, in <module>
[Sun Dec 09 14:37:49 2012] [error] import transaction as zope_transaction
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/transaction-1.3.0-py2.7.egg/transaction/__init__.py", line 19, in <module>
[Sun Dec 09 14:37:49 2012] [error] from transaction._transaction import Transaction
[Sun Dec 09 14:37:49 2012] [error] File "/usr/local/pythonenv/TG2.2ENV/lib/python2.7/site-packages/transaction-1.3.0-py2.7.egg/transaction/_transaction.py", line 115, in <module>
[Sun Dec 09 14:37:49 2012] [error] from transaction import interfaces
[Sun Dec 09 14:37:49 2012] [error] ImportError: cannot import name interfaces

The problem seems similar to that in http://osdir.com/ml/turbogears/2011-03/msg00052.html, but I did install the VE with --no-site-packages and within my environment, I can run python -c 'from transaction import interfaces' w/o an error.  It does not seem to be a problem with a missing package.  transaction-1.3.0 seems to be the current requirement (I easy_installed it just to be sure and that was the version present).  I ad the same problem with the same app with TG2.0 deployment and was hoping the upgrade to TG2.2 would fix it, but so far no luck.

I have a cron job that restarts apache every night and that seems to work OK, but looking for the cause of the problem.

Any ideas? 

Thanks,

Shane

[Michael Pedersen]

I was going to suggest upgrading to mod_wsgi 3.4, but I've just checked: We only ship transaction 1.1.1 by default still. See http://www.turbogears.org/2.2/downloads/2.2.0/index/transaction/index.html

It's been a few months since I've cut a new release, but I seem to recall going to higher versions of transactions as presenting problems. I'd suggest downgrading to transactions 1.1.1 (from your VE, "easy_install transactions==1.1.1"), and use that version. I'd expect that to fix it pretty quickly.

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[Stuart Zurcher]

I've been fighting this same issue for about a month with it happening intermittently...once or twice a week or every other week.

I changed to transactions-1.1.1.

Still get the interfaces import error.  When it restarts, it has RuntimeError: class.__dict__ not accessible in restricted mode

Based on recommendation from http://stackoverflow.com/questions/10557930/mod-wsgi-error-class-dict-not-accessible-in-restricted-mode, I added the following to /etc/apache2/sites-enabled/

project:

     WSGIProcessGroup %{GLOBAL}

Any one else had this problem and soved it?

[Stuart Zurcher]

Listen 8080
 

/etc/apache2/sites-enabled/MCPCS file

NameVirtualHost 10.81.27.21:8080
 
<VirtualHost 10.81.27.21:8080>
ServerName vmusjzdev2.co.marshall.ia.us
 
DocumentRoot /var/www/MCPCS
# WSGIProcessGroup MCPCS
# WSGIDaemonProcess MCPCS python-path=/opt/TG23MCPCS-env/lib/python2.7/site-packages
WSGIProcessGroup %{GLOBAL}
WSGIScriptAlias / /opt/MCPCS/apache/MCPCS.wsgi
WSGIPassAuthorization On
 
Alias /images /opt/MCPCS/mcispis/public/images
Alias /css /opt/MCPCS/mcispis/public/css
Alias /javascript /opt/MCPCS/mcispis/public/javascript
Alias /media /opt/MCPCS/mcispis/public/media
 
 
<Directory /opt/MCPCS/apache>
Order deny,allow
Allow from all
</Directory>
 
ErrorLog /var/log/apache2/MCPCS/error.log
LogLevel warn
CustomLog /var/log/apache2/MCPCS/access.log combined
 
 
</VirtualHost>

Stuart Zurcher

1134 Spencer St.

Grinnell, IA 50112

Cell: 641-521-5133

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[Shane]

Stuart,

I have a similar problem.  Can you tell me if you ever found a fix?

- Shane

[Stuart Zurcher]

@shane
I did, but no longer have access to the project. Sorry.

I think it had to do with how the dependencies were put in the project.