Scheduled Releases

Slides from presentation given at NSBarcelona September 2015 meet up.

Transcript

1. Scheduled Releases Renzo Crisóstomo iOS Developer @ XING @Ruenzuo
2. iOS at XING • 15 developers • 6 teams (2 central, 4 domain specific) • iOS codebase: 20 repositories • 15 libraries pods • 5 feature pods • ~1500 classes • ~155000 LOC (two months ago) • Tooling codebase: 8 repositories
3. The problem • Release often • How often? • GitHub (2012): ~100 deploys per day • App Store Review • Average (29.09): 6 days • (°□°)
   
4. Release train • 4 weeks cycle • 2 weeks sprints • Code freeze every second friday • 2 weeks on Pre-Release • App Store release each two weeks
5. Overlap
6. Build • Alpha: every single commit on master • Next: same as Alpha, but with latest beta SDK • Beta: After code freeze, each two weeks • Mainly used by the QA team • Pre-Release: After testing beta version for two days • Tested by all XING employees (~500) and external testers • App Store: After Pre-Release phase (two weeks)
7. Xcode • Build configurations + Schemes • User defined variables (~20) • xcodebuild as our CI build system • We love CocoaPods • Don't rely (excessively) on third party tooling
8. Shipping • Not all code shipped has to be executed • A/B tests • Not all code on your codebase has to be shipped • Conditional compilation • Turn on/off features • Modularization • Easy to rollback • It's "OK" to ship bugs, as long as you're aware
10. Conditional compilation #define SHOW_LOGIN_DEBUG (CONFIGURATION_Debug || CONFIGURATION_Beta || CONFIGURATION_Next) @implementation XNGLoginViewController ... - (void)viewDidLoad { ... #if SHOW_LOGIN_DEBUG self.loginDebugHelper = [[XNGLoginDebugHelper alloc] initWithLoginViewController:self]; #endif } ... @end
11. Modularization • CocoaPods (20 pods) • Private Spec repos • Mirror public pods (XNGPodsSynchronizer) • Module manager • URL Schemes to navigate • JLRoutes
12. @protocol XNGPackageProtocol <NSObject> + (NSString *)packageName; @optional + (void)registerURLs; + (NSURL *)baseURL; + (BOOL)canDoSomethingWithSomething:(SomeClass *)something; ... @end
13. @implementation XNGModuleManager ... - (NSArray *)packageClasses { unsigned int count = 0; Class *classList = objc_copyClassList(&count); NSMutableArray *foundPackages = [NSMutableArray arrayWithCapacity:count]; for (int index = 0; index < count; index++) { Class pluginClass = classList[index]; if (class_conformsToProtocol(pluginClass, @protocol(XNGPackageProtocol))) { [foundPackages addObject:pluginClass]; } } free(classList); return foundPackages; } ... @end
14. Learnings • Be strict • Practice, practice, practice • Too many dependencies is trouble • Modularization is hard • Be courageous ™ • Find something that works for you • and invest time understanding it
15. Merci !
16. Resources • Scaling mobile at XING by Alexey Krivitsky • http:/ /www.infoq.com/articles/scaling-agile-xing • Modular iOS App @ UIKonf 2014 by Piet Brauer • https:/ /speakerdeck.com/pietbrauer/modular-ios- app-at-uikonf-2014 • Managing Xcode by Samantha Marshall • http:/ /samdmarshall.com/blog/ managing_xcode.html