俺コン Vol.1: Layered Architecture x RxSwiftを活用した適切なエラーハンドリング

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Layered Architecture x RxSwift Λ׆༻ͨ͠ ద੾ͳΤϥʔϋϯυϦϯά @nonchalant0303 Զίϯ Vol.1 / Day. 1

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ࣗݾ঺հ • Takeshi Ihara • Recruit Marketing Partners • iOS Engineer • Twitter: @nonchalant0303 • GitHub: Nonchalant

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OSS https://github.com/Nonchalant/AppIcon

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Kyobashi.swift

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ΤϥʔϋϯυϦϯά

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ΤϥʔϋϯυϦϯά ϓϩάϥϜͷॲཧதʹॲཧ͕๦͛ΒΕΔࣄ৅͕ ൃੜͨ͠ࡍɺͦͷॲཧΛΤϥʔͱͯ͠ରॲ͢Δ ॲཧͷ͜ͱͰ͋Δɻྫ֎ॲཧͱ΋ݺ͹ΕΔɻ

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Α͋͘ΔΤϥʔ

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Xcode

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ͱΓ͋͑ͣ࠶ىಈ ͢Ε͹͍͍͔

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ͳͥ࠶ىಈ͠Α͏ͱߟ͑ͨͷ͔ʁ աڈʹମݧͨ͜͠ͱ͕͋Δ ͦͷࡍʹ࠶ىಈͨ͠Β࣏ͬͨͨΊ

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ϝʔϧΞυϨε͕ ؒҧ͍ͬͯΔʁ ύεϫʔυ͕ ؒҧ͍ͬͯΔʁ

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ϝʔϧΞυϨε͕ ؒҧ͍ͬͯΔʁ ύεϫʔυ͕ ؒҧ͍ͬͯΔʁ αʔϏε յΕͯΔʂ αʔϏε յΕͯΔʂ

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αʔϏε཭Ε

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Ϣʔβʔ͸༷ʑ • ITϦςϥγʔ͕ߴ͍͔௿͍͔ • αʔϏεʹ׳Ε਌͠ΜͰ͍Δ͔Ͳ͏͔ • …

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࣍ʹ͢΂͖ߦಈ͕ ෼͔Δ

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ద੾ͳΤϥʔ

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࣍ʹ͢΂͖ߦಈ͕ ෼͔Βͳ͍

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ෆద੾ͳΤϥʔ

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ϝʔϧΞυϨε͕ ؒҧ͍ͬͯΔʁ ύεϫʔυ͕ ؒҧ͍ͬͯΔʁ αʔϏε յΕͯΔʂ αʔϏε յΕͯΔʂ

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࣍ʹ͢΂͖ߦಈ͕ ෼͔Δ

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ద੾ͳΤϥʔ

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ΤϥʔϋϯυϦϯά ൃੜͨ͠ΤϥʔʹԠͯ͡ɺϢʔβʔʹݱࡏͷঢ় ଶΛࣔ͠ɺඞཁʹԠͯ࣍͡ͷߦಈΛࣔ͢͜ͱ

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ΤϥʔϋϯυϦϯά͸೉͍͠

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Τϥʔͷछྨ͕ଟ͍ • ωοτϫʔΫͷ઀ଓΤϥʔ • ೖྗ߲໨ͷؒҧ͍ʹΑΔΤϥʔ • λΠϜΞ΢τʹΑΔΤϥʔ • …

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1. ΤϥʔΛͻͨ͢Βચ͍ग़͢ ൈ͚࿙Ε͸ڐ༰͢Δ

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2. ΤϥʔΛ෼ྨ͢Δ

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2. ΤϥʔΛ෼ྨ͢Δ Πϯϑϥܥ ϏδωεϩδοΫܥ ωοτϫʔΫ઀ଓΤϥʔ ೖྗ߲໨ͷؒҧ͍ʹΑΔΤϥʔ λΠϜΞ΢τʹΑΔΤϥʔ ϢʔβʔͷݖݶΤϥʔ ʜ ʜ

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Layered Architecture *OGSBTUSVDUVSF 1SFTFOUBUJPO %PNBJO

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Infrastructure Πϯϑϥܥ ωοτϫʔΫ઀ଓΤϥʔ λΠϜΞ΢τʹΑΔΤϥʔ ʜ enum InfrastructureError: Error { case connection case timeout … case unknown }

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Domain ϏδωεϩδοΫܥ ೖྗ߲໨ͷؒҧ͍ʹΑΔΤϥʔ ϢʔβʔͷݖݶΤϥʔ ʜ enum DomainError: Error { case input case permission ... case unknown }

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Layered Architectureͷݪଇ ԼͷϨΠϠʔͷਓ͸্ͷϨΠϠʔ͕ެ։͍ͯ͠ ΔJOUFSGBDF͚ͩΛ஌͍ͬͯΔ

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ݪଇʹ൓ͯ͠ࢀরͰ͖Δ *OGSBTUSVDUVSF 1SFTFOUBUJPO %PNBJO

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Embedded Framework *OGSBTUSVDUVSF 1SFTFOUBUJPO %PNBJO

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[Pros] Embedded Framework • Layerͷґଘؔ܎͕໌֬ʹͳΔ • ࠩ෼Ϗϧυ͕ಇ͖΍͘͢ͳΔ • ෆඞཁͳϥΠϒϥϦ͕ࢀরͰ͖ͳ͘ͳΔ • ModuleຖʹݴޠͷMigration͕Ͱ͖Δ

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ϨΠϠʔؒͷܨ͗ࠐΈ *OGSBTUSVDUVSF 1SFTFOUBUJPO %PNBJO *OGSBTUSVDUVSF&SSPS %PNBJO&SSPS

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InfrastructureErrorΛ Presentationʹ఻ൖͰ͖ͳ͍ InfrastructureErrorΛ DomainErrorʹม׵͢Δඞཁ͕͋Δ

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InfrastructureError → DomainError *OGSBTUSVDUVSF&SSPS %PNBJO&SSPS DPOOFDUJPO DPOOFDUJPO UJNFPVU ʜ JOQVU ʜ QFSNJTTJPO

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ϩάΠϯ 1. ϝʔϧΞυϨεͱύεϫʔυೖྗ 2. ϩάΠϯ͢Δ 3. Success or Failure

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• ྫ֎ΛUISPX͢Δ • force-tryΛ༻͍ͳ͍ͱࢀর͢Δϝιου ͢΂ͯʹthrows͕ඞཁʹͳΔ 1. try-catch

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*OGSB 1SFTFOUBUJPO %PNBJO ϩάΠϯ public protocol PublishRepository { func login(email: String, password: String) throws -> User } public protocol LoginUseCase { func login(email: String, password: String) throws } public protocol LoginPresenter { func login(email: String, password: String) throws }

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• ྫ֎Λ'BJMVSFઅʹ౉͢ • Switch-caseΛຖճॻ͘ඞཁ͕͋Δ • ม׵ॲཧΛ͠ͳ͍৔߹Ͱ΋DBTFจ͕ඞཁʹͳ Δ 2. Result

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*OGSB 1SFTFOUBUJPO %PNBJO ϩάΠϯ public protocol PublishRepository { func login(email: String, password: String) -> Result } public protocol LoginUseCase { func login(email: String, password: String) -> Result } public protocol LoginPresenter { func login(email: String, password: String) -> Result }

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• ྫ֎ΛPO&SSPSઅʹ౉͢ • catchErrorઅͰΤϥʔϋϯυϦϯά͢Δ • catchErrorઅ͕ͳ͍৔߹͸ͦͷ··ྫ֎͕ ԼྲྀʹྲྀΕΔ 3. RxSwift

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*OGSB 1SFTFOUBUJPO %PNBJO ϩάΠϯ public protocol PublishRepository { func login(email: String, password: String) -> Single } public protocol LoginUseCase { func login(email: String, password: String) -> Completable } public protocol LoginPresenter { func login(email: String, password: String) -> Completable }

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*OGSBTUSVDUVSF&SSPS %PNBJO&SSPS 1SFTFOUBUJPO&SSPS DPOOFDUJPO DPOOFDUJPO DPOOFDUJPO QFSNJTTJPO QFSNJTTJPO UFNQPSBSZ1BTTXPSE &YQJSFE UFNQPSBSZ1BTTXPSE &YQJSFE BQJ3FQPOTF SFTQPOTF SFTQPOTF JOUFSOBMTFSWFSFSSPS VOLOPXO VOLOPXO USBOTMBUJPO

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struct PublishRepositoryImpl: PublishRepository { func login(email: String, password: String) -> Single { return apiClient.create( with: PublishRequest(email: email, password: password) ) } } Infrastructure

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struct LoginUseCaseImpl: LoginUseCase { func login(email: String, password: String) -> Completable { return repository.login(email: email, password: password) .asObservable() .catchError { error -> Observable in return Observable.error(DomainError.create(with: error)) } .flatMap { user -> Observable in guard user.hasPermission else { throw DomainError.permission } guard !user.isTemporaryPasswordExpired else { throw DomainError.temporaryPasswordExpired } return Observable.empty() } .asCompletable() } } Domain

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struct LoginPresenterImpl: LoginPresenter { func login(email: String, password: String) -> Completable { return useCase.login(email: email, password: password) .catchError { error -> Completable in return Completable.error(PresentationError.create(with: error)) } } } Presentation

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֤ϨΠϠʔͰ ΤϥʔϋϯυϦϯάΛߦ͏

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·ͱΊ • ΤϥʔͷೝࣝΛἧ͑Δ͜ͱʹΑΓυΩϡϝ ϯτԽͰ͖Δ • Embedded FrameworkʹΑΓΤϥʔʹ Layerͷ஌ࣝΛ෇༩Ͱ͖Δ • Layerͷܨ͗ࠐΈ͸֤ϓϩμΫτʹ߹Θͤͨ ํ๏Λ࠾༻͠·͠ΐ͏