A Journey Into Feature Toggles - OSCON Austin 2017

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Pete Hodgson OSCON Aus1n 2017 FEATURE TOGGLES a journey into

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@ph1 #oscon Let me  tell you  a story

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@ph1 #oscon Boy, that merge conﬂict we ran into sure was painful “

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@ph1 #oscon master ! Sam's feature branch Jesse’s feature branch merge bomb based on: martinfowler.com/bliki/FeatureBranch.html

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@ph1 #oscon avoiding the  merge bombs

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@ph1 #oscon Product Details Buy Related Products

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@ph1 #oscon function relatedProducts(product){ // current implementation lives here }

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@ph1 #oscon function old_relatedProducts(product){ // current implementation lives here } function new_relatedProducts(product){ // TODO: write a better // related products algorithm }

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@ph1 #oscon function relatedProducts(product){ var useNewAlgorithm = false; if( useNewAlgorithm ){ return new_relatedProducts(product); }else{ return old_relatedProducts(product); } } function old_relatedProducts(product){ // current implementation lives here } function new_relatedProducts(product){ // TODO: write a better // related products algorithm }

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@ph1 #oscon exis1ng implementa1on client

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@ph1 #oscon exis1ng implementa1on new implementa1on client

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@ph1 #oscon exis1ng implementa1on client half-ﬁnished new implementa1on

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@ph1 #oscon exis1ng implementa1on client half-ﬁnished new implementa1on

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@ph1 #oscon exis1ng implementa1on client half-ﬁnished new implementa1on

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@ph1 #oscon exis1ng implementa1on client half-ﬁnished new implementa1on

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@ph1 #oscon let’s get dynamic

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@ph1 #oscon function relatedProducts(product){ var useNewAlgorithm = false; if( useNewAlgorithm ){ return new_relatedProducts(product); }else{ return old_relatedProducts(product); } }

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@ph1 #oscon function relatedProducts(product){ if( featureEnabled(“use-new-related-products-algo”) ){ return new_relatedProducts(product); }else{ return old_relatedProducts(product); } }

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@ph1 #oscon exis1ng implementa1on new implementa1on client

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@ph1 #oscon exis1ng implementa1on new implementa1on client

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@ph1 #oscon FEATURE TOGGLES

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@ph1 #oscon FEATURE TOGGLES a journey into

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@ph1 #oscon FLAGS BITS FLIPPERS FEATURE TOGGLES

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@ph1 #oscon decoupling deployment from release

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@ph1 #oscon it starts with  merge conﬂicts

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@ph1 #oscon back to  the story...

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@ph1 #oscon Canary  Releases A/B Tests Kill Switches Beta Testers Premium  Features

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@ph1 #oscon 1me out!

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@ph1 #oscon you keep using that word…

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@ph1 #oscon choosing code paths at runLme

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@ph1 #oscon client

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@ph1 #oscon client

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@ph1 #oscon treat diﬀerent toggles diﬀerently

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@ph1 #oscon Ops Toggles Permission Toggles Release Toggles Experiment Toggles

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@ph1 #oscon longevity release toggles  are around for days permissions toggles  are around for years

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@ph1 #oscon dynamism release toggles  vary per deployment experiment toggles  vary per request

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@ph1 #oscon ownership release toggles ops toggles permission toggles experiment toggles owned by devs owned by ops owned by product

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@ph1 #oscon toggle longevity

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@ph1 #oscon function relatedProducts(product){ if( featureEnabled(“use-new-related-products-algo”) ){ return new_relatedProducts(product); }else{ return old_relatedProducts(product); } }

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@ph1 #oscon if( featureEnabled(“use-new-related-products-algo”) ){ // do X }else{ // do Y } if( featureEnabled(“use-new-related-products-algo”) ){ // do X }else{ // do Y } if( featureEnabled(“use-new-related-products-algo”) ){ // do X }else{ // do Y } if( featureEnabled(“use-new-related-products-algo”) ){ // do X }else{ // do Y }

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@ph1 #oscon toggle dynamism

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@ph1 #oscon Product Details Buy Related Products

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@ph1 #oscon Product Details BUY!

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@ph1 #oscon function renderProductDetailsPage(){ if( featureEnabled(“show-related-products”) ){ renderProductDetailsSection({renderBuyButton:true}); renderRelatedProductSection(); }else{ renderProductDetailsSection({renderBuyButton:false}); renderReallyBigBuyButton(); } } function renderProductDetailsPage(){ if( featureEnabled(“show-related-products”,request) ){ renderProductDetailsSection({renderBuyButton:true}); renderRelatedProductSection(); }else{ renderProductDetailsSection({renderBuyButton:false}); renderReallyBigBuyButton(); } }

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@ph1 #oscon toggle conﬁguraLon sta1c dynamic

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@ph1 #oscon toggle configuraLon Hard-coded  in source config baked  into deployment parameterized  config config in  the app DB distributed config  (e.g. Consul, ZooKeeper) sta1c dynamic

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@ph1 #oscon ? sta1c dynamic

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@ph1 #oscon make toggle  conﬁguraLon observable

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@ph1 #oscon allow overriding conﬁguraLon for tesLng

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@ph1 #oscon advice from the trenches

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@ph1 #oscon toggles aren’t free

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@ph1 #oscon tesLng toggled code  isn’t easy

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@ph1 #oscon toggles help you   go faster

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FEATURE TOGGLES your journey into @ph1 #oscon

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@ph1 #oscon @ph1 thepete.net mar1nfowler.com/ar1cles/feature-toggles.html thanks!