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Production:	Designing	
for	Testability
Michael	Bryzek
mike@flow.io /	@mbryzek
Cofounder	/	CTO	Flow
Cofounder	/	ex-CTO	Gilt
Think about something you deployed
recently to production…
Is	It	Working?
Right	now	in	production?
How	do	you	know?
Feeling	anxious?
7
Let’s	remove	that	anxiety
About Me
www.flow.io
www.gilt.com
Software Quality is Hard
Think	end	to	end	for	entire	lifecycle	of	code
Verification	in	Production	is	a	powerful	technique
to	help	us	build	quality	software
True	continuous	delivery
No	staging	environments
Don’t	run	code	locally
Life at Flow: Delivering Quality Software
True Continuous Delivery
Automated	tests	/	No	safeguards
1	way	to	do	something
Assume	Continuous	Delivery	in	Design	Process
github.com/flowcommerce/delta
“I	love	my	staging	environment”
Said	Nobody	Ever
No Staging Environments
Bottlenecks
Fragile
Difficult	to	understand	failure
Expensive	(30-40%	of	budget	common)
Create	the	wrong	incentives
Don’t run code locally
If	unsure,	write	the	test!
Learn	to	trust your	tests
Quality Through Architecture
Extreme	Isolation
• Rich	event	streams
• Own	DNS,	load	balancer
• Private	database
• No	consul/zk/shared	state
• Stop	cascading	failures
• “Delay” not “Outage”
Let’s	look	at	real	examples
Successfully	“testing	in	production”
Example: Know That Checkout Works
Bot places an order every few minutes
Identify test orders and immediately cancel
Example: Support “Sandbox” Accounts
”SaaS”	– even	for	internal	accounts
Mark	individual	accounts	as	sandbox
One	API	Key	for	all	sandbox	accounts
"every	service	is	a	third	party"
Example: End to End Integration Tests
Create	Sandbox	Org
Run	tests
Delete	Sandbox	Org
“Safe	and	Repeatable”
Example: Using Sandbox Account for Test Orders
Example: Verifying Proxy Server Works as Expected
https://github.com/flowvault/proxy
Operating	As	Expected
But	sometimes	things	go	wrong
Even	to	the	best	of	teams
Considerations
Make	production	access	explicit	(not	the	default)
Use	defined	paths	(e.g.	API	calls)
Restrict	sensitive	data
Design	for	side	effects
Unexpected	Benefits
Perfect Documentation
Capture request/response of API Calls
Tooling: API | Builder
(formerly known as apidoc)
28
www.apibuilder.io
Version	control	for	APIs
Backwards	Compatibility
High	Quality	Mocks
High Quality Mocks – From Specs
Full	Mock	Generated
Implement	Only	What
You	Need	To	Test
www.apibuilder.io
Tooling: Real Time DB Monitoring
https://www.vividcortex.com/blog/2014/04/22/visualizing-impact-index-change/
Tooling: Super Simple Alerts from Log
Log	a	prefix
Schedule	a	real	time	alert
Key Takeaways – Design Production to be Testable
Trust	your	tests,	run	subset	in	production
Invest	in	continuous	delivery
Sandbox	accounts	are	powerful
High	quality,	trustworthy	mocks
Real-time	feedback	from	production
Thank	You!
We’re	hiring:	https://www.flow.io/careers
Michael	Bryzek
mike@flow.io /	@mbryzek
Cofounder	/	CTO	Flow
Cofounder	/	ex-CTO	Gilt

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Production - Designing for Testability