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Architecting a Culture of Quality
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David Cramer
May 02, 2014
Programming
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Architecting a Culture of Quality
Python Nordeste 2014
David Cramer
May 02, 2014
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Transcript
David Cramer twitter.com/zeeg Architecting a Culture of Quality
None
None
I work on Developer Productivity
(aka the build system + tooling)
ň+PGGFVQRWUJVJKUEJCPIGQWVTKIJVPQYʼn
None
How do we stop emergency pushes?
Identifying the Problems
Slow build process DQQVUVTCRRTQXKUKQPVGUVUGVE
Inaccurate or missing tests
Complex dependencies
Day 1 at Dropbox..
"Go through these manual steps to setup a dev environment”
None
"Why aren’t we using something like Vagrant?"
Keep Things Simple
“make” — a promise that it’s simple
.PHONY: develop setup-env ! # install dependencies develop: setup-env npm
install bower install env/bin/pip install -e . ! ! # ensure virtualenv setup-env: virtualenv ./env
a Makefile is just one solution
Bootstrap affects our sanity
vagrant up ⇢ puppet apply
Bootstrap affects newly hired developers
Bootstrap affects rebuilding environments
Bootstrap affects ability and time to run tests
Remove Dependencies
You cannot reproduce your production environment
Stop Trying
Do you really need Apache? RTQDCDN[PQV
Do you really need HAProxy? UGTKQWUN[!
Do you really need RabbitMQ? JQYCDQWV4GFKU!
Do you really need Zookeeper? PQRG
Do you really need Hadoop? NQN
Do you really need Anything?
Justify your dependencies
Use build servers for whatever is left over
Find Your Bottlenecks [QWRTQDCDN[FQP VGXGPPGGFC8/
Does a using (and maintaining) a VM actually save you
time?
Building A Testing Culture
Make testing so easy that you feel good about writing
tests
"Oh hey, a test I can copy/paste" +VņUCDQWVVJGOCMKPIKVCEEGUUKDNG
Encourage building better testing tools and paradigms
pip install pytest
pip install flake8
pip install mock
Your goal is to make testing accessible
Automatically test individual commits to ensure every change is stable
None
Test Continuously Before code review
Test Continuously During code review
Test Continuously Post-code review (merge)
Keep a tight Feedback Loop PQQPGYCPVUVQHKPFQWVVJGPGZVFC[VJCVVJGKTEQFGYCUDTQMGP
None
Time to response is so important that we fanout to
25 servers per build
Prevent mistakes by blocking commits which fail the build cycle
Red builds can never be deployed
Use Code Review
None
Use Code Review to sanity check code
Use Code Review to influence testing culture
Use Code Review to educate developers
Use Code Review to decrease cycle time
"Does this change look sane?"
"No, this will break X, Y, and Z" FKF[QWGXGPMPQY:YCUCVJKPI!
Aim for Quality Patches
Changes happen outside of master causing master to be the
new stable CMCVKRQTVTWPM
Quality Will Happen
Smaller, better commits
Accessibility is your goal
Accuracy breeds adoption
Scale culture through tooling
Thank You! ! twitter.com/zeeg