Could not find backend mysql+pymsql

[Joshua Harlow]

When attempting to use the following connection to a persistence backend it fails...

>>> from taskflow.persistence import backends
>>>
>>> config = {
... 'connection': 'mysql+pymysql://root@localhost/taskflow',
... }
>>> b = backends.fetch(config)
>>> print b.engine

The failure is along the lines of:

taskflow.exceptions.NotFound: Could not find backend mysql+pymsql: No 'taskflow.persistence' driver found, looking for 'mysql+pymsql'

This is due to the fact that we look for a driver with that entrypoint name and our names don't account for this kind of dialect support (which sqlalchemy supports).

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/139273
Committed: https://git.openstack.org/cgit/openstack/taskflow/commit/?id=81505533675d3edff88ab0dc1ac04b0a558bbbbe
Submitter: Jenkins
Branch: master

commit 81505533675d3edff88ab0dc1ac04b0a558bbbbe
Author: Joshua Harlow <email address hidden>
Date: Thu Dec 4 16:11:56 2014 -0800

    Fix split on "+" for connection strings that specify dialects

    Fixes bug 1399486

    Change-Id: I3b7e6331751f25d9c4221393e8329934925791e7