A brief history of the OpenStack Oslo program and our work during the Juno release cycle.

1. Taking the Long View:
How the Oslo Program
Reduces Technical Debt
Doug Hellmann
Atlanta OpenStack Meetup
September, 2014

2. Mission
To produce a set of python libraries containing code
shared by OpenStack projects. The APIs provided by
these libraries should be high quality, stable,
consistent, documented and generally applicable.

3. Project Motivation
• Consistency for deployers
• Consistency for developers
• Identify and foster common patterns

4. My Motivation
"I cannot imagine the future, but I care about it. I
know I am a part of a story that starts long before I
can remember and continues long beyond when
anyone will remember me. I sense that I am alive at a
time of important change, and I feel a responsibility to
make sure that the change comes out well. I plant my
acorns knowing that I will never live to harvest the
oaks.”
http://longnow.org/clock/

5. The Oslo Team
• Generalist code reviewers
• Specialist API maintainers

6. From Scratch
• oslosphinx - documentation theme
• pbr - packaging

7. Adopted
• cliff - command line apps
• stevedore - dynamic code loading
• taskflow - job workflow
• pylockfile - inter-process synchronization

12. Graduation Changes
• Clean up configuration options
• Provide configuration-free API?
• Plug leaky APIs
• Expand/contract API to meet needs of consumers
• Name the library

14. funcutils
importutils
pycadf
oslo.config
oslo.messaging
authutils
cliff
cliutils
audit
middleware/context
cache
lockutils
periodic_task
timeutils memorycache
apiclient
strutils
gettextutils
fileutils
processutils
cfgfilter
config crypto
db
stevedore hooks
imageutils
excutils
local
log
jsonutils
sslutils
network_utils
log_handler
notifier
rpc
context
service
versionutils
zmq
middleware
policy
quota
reports
rootwrap
xmlutils
eventlet_backdoor
loopingcall
requestutils
threadgroup
fixture
test
units
uuidutils
oslo.version
oslo.vmware
pbr
scheduler
taskflow

15. taskflow
oslo.server oslo.serialization
stevedore
oslo.i18n
oslo.utils
oslo.concurrency
oslo.io oslo.config
oslo.crypto
oslo.reports oslo.policy
oslo.middleware
oslo.messaging
oslo.image
oslo.cache
oslo.quota
oslo.vmware
oslo.client
PyCADF
oslo.log
oslo.db
oslo.versionutils
oslo.hooks

16. Graduated Libraries
• oslo.config
• oslo.db
• oslo.i18n
• oslo.messaging
• oslo.middleware
• oslo.rootwrap
• oslo.serialization
• oslotest
• oslo.utils

17. Naming Considerations
Primarily for!
OpenStack Use
Useful to!
Other Projects
Runtime oslo.config taskflow
Non-Runtime oslotest pbr

18. Beyond OpenStack
• Upstream work: Bug fixes & Requirements
• Outside contributors
• Adoptions

19. Oslo & Python 3
• Python 2.7 is receiving bug fixes, but no new
features
• Targeting Python 3.4
• Bottom-up approach

20. taskflow
oslo.server oslo.serialization
stevedore
oslo.i18n
oslo.utils
oslo.concurrency
oslo.io oslo.config
oslo.crypto
oslo.reports oslo.policy
oslo.middleware
oslo.messaging
oslo.image
oslo.cache
oslo.quota
oslo.vmware
oslo.client
PyCADF
oslo.log
oslo.db
oslo.versionutils
oslo.hooks
Plans for Kilo

21. Questions?