Andy (and Brian?)

I don't know if that can easily be improved... Here is what I typically 
get when I introduce a problem in wmgr:

Traceback (most recent call last):
   File 
"/home/becla/stack/Linux64/flask/0.10.1+11/lib/python/Flask-0.10.1-py2.7.egg/flask/app.py", 
line 1817, in wsgi_app
     response = self.full_dispatch_request()
   File 
"/home/becla/stack/Linux64/flask/0.10.1+11/lib/python/Flask-0.10.1-py2.7.egg/flask/app.py", 
line 1477, in full_dispatch_request
     rv = self.handle_user_exception(e)
   File 
"/home/becla/stack/Linux64/flask/0.10.1+11/lib/python/Flask-0.10.1-py2.7.egg/flask/app.py", 
line 1378, in handle_user_exception
     if isinstance(e, typecheck):
TypeError: isinstance() arg 2 must be a class, type, or tuple of classes 
and types
2015-09-09 11:37:43,574 [PID:4849] [INFO] (_log() at _internal.py:87) 
werkzeug: 127.0.0.1 - - [09/Sep/2015 11:37:43] "POST /dbs HTTP/1.1" 500 -


to get a sensible stack trace that is actually useful, I end up
commenting out:

[log in to unmask](DbException)
[log in to unmask](sqlalchemyExc)
[log in to unmask](MySQLdb.Error)
[log in to unmask](MySQLdb.Warning)
#def dbExceptionHandler(error):
#    """ All leaked database-related exceptions generate 500 error """
#    return errorResponse(500, error.__class__.__name__, str(error))


This is the error I would get if errorhandler code would be
commented out:


Traceback (most recent call last):
   File 
"/home/becla/stack/Linux64/flask/0.10.1+11/lib/python/Flask-0.10.1-py2.7.egg/flask/app.py", 
line 1817, in wsgi_app
     response = self.full_dispatch_request()
   File 
"/home/becla/stack/Linux64/flask/0.10.1+11/lib/python/Flask-0.10.1-py2.7.egg/flask/app.py", 
line 1477, in full_dispatch_request
     rv = self.handle_user_exception(e)
   File 
"/home/becla/stack/Linux64/flask/0.10.1+11/lib/python/Flask-0.10.1-py2.7.egg/flask/app.py", 
line 1381, in handle_user_exception
     reraise(exc_type, exc_value, tb)
   File 
"/home/becla/stack/Linux64/flask/0.10.1+11/lib/python/Flask-0.10.1-py2.7.egg/flask/app.py", 
line 1475, in full_dispatch_request
     rv = self.dispatch_request()
   File 
"/home/becla/stack/Linux64/flask/0.10.1+11/lib/python/Flask-0.10.1-py2.7.egg/flask/app.py", 
line 1461, in dispatch_request
     return self.view_functions[rule.endpoint](**req.view_args)
   File 
"/usr/local/home/becla/stack/repos/qserv/lib/python/lsst/qserv/wmgr/dbMgr.py", 
line 194, in createDb
     dbConn = Config.instance().privDbEngine().connect()
   File 
"/usr/local/home/becla/stack/repos/qserv/lib/python/lsst/qserv/wmgr/config.py", 
line 120, in privDbEngine
     inst = engineFactory().getEngineFromArgs(**kwargs)
NameError: global name 'engineFactory' is not defined


See? That is so much better. I entered engineFactory instead of
EngineFactory. There is no way I could have figured it out from the
previous stack trace...

How can we improve that?

Jacek

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