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

https://orecon.connpass.com/event/63769/

Transcript

1. Layered Architecture x RxSwift Λ׆༻ͨ͠ ద੾ͳΤϥʔϋϯυϦϯά @nonchalant0303 Զίϯ Vol.1 / Day. 1
2. ࣗݾ঺հ • Takeshi Ihara • Recruit Marketing Partners • iOS Engineer • Twitter: @nonchalant0303 • GitHub: Nonchalant
3. OSS https://github.com/Nonchalant/AppIcon
4. Kyobashi.swift
5. ΤϥʔϋϯυϦϯά
6. ΤϥʔϋϯυϦϯά ϓϩάϥϜͷॲཧதʹॲཧ͕๦͛ΒΕΔࣄ৅͕ ൃੜͨ͠ࡍɺͦͷॲཧΛΤϥʔͱͯ͠ରॲ͢Δ ॲཧͷ͜ͱͰ͋Δɻྫ֎ॲཧͱ΋ݺ͹ΕΔɻ
7. Α͋͘ΔΤϥʔ
9. Xcode
10. ͱΓ͋͑ͣ࠶ىಈ
    ͢Ε͹͍͍͔
11. ͳͥ࠶ىಈ͠Α͏ͱߟ͑ͨͷ͔ʁ աڈʹମݧͨ͜͠ͱ͕͋Δ ͦͷࡍʹ࠶ىಈͨ͠Β࣏ͬͨͨΊ
13. ϝʔϧΞυϨε͕ ؒҧ͍ͬͯΔʁ ύεϫʔυ͕
    ؒҧ͍ͬͯΔʁ
14. ϝʔϧΞυϨε͕ ؒҧ͍ͬͯΔʁ ύεϫʔυ͕
    ؒҧ͍ͬͯΔʁ αʔϏε
    յΕͯΔʂ αʔϏε
    յΕͯΔʂ
15. αʔϏε཭Ε
16. Ϣʔβʔ͸༷ʑ • ITϦςϥγʔ͕ߴ͍͔௿͍͔ • αʔϏεʹ׳Ε਌͠ΜͰ͍Δ͔Ͳ͏͔ • …
18. ࣍ʹ͢΂͖ߦಈ͕
    ෼͔Δ
19. ద੾ͳΤϥʔ
21. ࣍ʹ͢΂͖ߦಈ͕
    ෼͔Βͳ͍
22. ෆద੾ͳΤϥʔ
24. ϝʔϧΞυϨε͕ ؒҧ͍ͬͯΔʁ ύεϫʔυ͕
    ؒҧ͍ͬͯΔʁ αʔϏε
    յΕͯΔʂ αʔϏε
    յΕͯΔʂ
25. ࣍ʹ͢΂͖ߦಈ͕
    ෼͔Δ
26. ద੾ͳΤϥʔ
27. ΤϥʔϋϯυϦϯά ൃੜͨ͠ΤϥʔʹԠͯ͡ɺϢʔβʔʹݱࡏͷঢ় ଶΛࣔ͠ɺඞཁʹԠͯ࣍͡ͷߦಈΛࣔ͢͜ͱ
28. ΤϥʔϋϯυϦϯά͸೉͍͠
29. Τϥʔͷछྨ͕ଟ͍ • ωοτϫʔΫͷ઀ଓΤϥʔ • ೖྗ߲໨ͷؒҧ͍ʹΑΔΤϥʔ • λΠϜΞ΢τʹΑΔΤϥʔ • …
30. 1. ΤϥʔΛͻͨ͢Βચ͍ग़͢ ൈ͚࿙Ε͸ڐ༰͢Δ
31. 2. ΤϥʔΛ෼ྨ͢Δ
32. 2. ΤϥʔΛ෼ྨ͢Δ Πϯϑϥܥ ϏδωεϩδοΫܥ ωοτϫʔΫ઀ଓΤϥʔ ೖྗ߲໨ͷؒҧ͍ʹΑΔΤϥʔ λΠϜΞ΢τʹΑΔΤϥʔ ϢʔβʔͷݖݶΤϥʔ ʜ ʜ
33. Layered Architecture *OGSBTUSVDUVSF 1SFTFOUBUJPO %PNBJO
34. Infrastructure Πϯϑϥܥ ωοτϫʔΫ઀ଓΤϥʔ λΠϜΞ΢τʹΑΔΤϥʔ ʜ enum InfrastructureError: Error { case connection case timeout … case unknown }
35. Domain ϏδωεϩδοΫܥ ೖྗ߲໨ͷؒҧ͍ʹΑΔΤϥʔ ϢʔβʔͷݖݶΤϥʔ ʜ enum DomainError: Error { case input case permission ... case unknown }
36. Layered Architectureͷݪଇ ԼͷϨΠϠʔͷਓ͸্ͷϨΠϠʔ͕ެ։͍ͯ͠ ΔJOUFSGBDF͚ͩΛ஌͍ͬͯΔ
37. ݪଇʹ൓ͯ͠ࢀরͰ͖Δ *OGSBTUSVDUVSF 1SFTFOUBUJPO %PNBJO
38. Embedded Framework *OGSBTUSVDUVSF 1SFTFOUBUJPO %PNBJO
39. [Pros] Embedded Framework • Layerͷґଘؔ܎͕໌֬ʹͳΔ • ࠩ෼Ϗϧυ͕ಇ͖΍͘͢ͳΔ • ෆඞཁͳϥΠϒϥϦ͕ࢀরͰ͖ͳ͘ͳΔ • ModuleຖʹݴޠͷMigration͕Ͱ͖Δ
40. ϨΠϠʔؒͷܨ͗ࠐΈ *OGSBTUSVDUVSF 1SFTFOUBUJPO %PNBJO *OGSBTUSVDUVSF&SSPS %PNBJO&SSPS
41. InfrastructureErrorΛ Presentationʹ఻ൖͰ͖ͳ͍ InfrastructureErrorΛ DomainErrorʹม׵͢Δඞཁ͕͋Δ
42. InfrastructureError → DomainError *OGSBTUSVDUVSF&SSPS %PNBJO&SSPS DPOOFDUJPO DPOOFDUJPO UJNFPVU ʜ JOQVU ʜ QFSNJTTJPO
43. ϩάΠϯ 1. ϝʔϧΞυϨεͱύεϫʔυೖྗ 2. ϩάΠϯ͢Δ 3. Success or Failure
44. • ྫ֎ΛUISPX͢Δ • force-tryΛ༻͍ͳ͍ͱࢀর͢Δϝιου ͢΂ͯʹthrows͕ඞཁʹͳΔ 1. try-catch
45. *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 }
46. • ྫ֎Λ'BJMVSFઅʹ౉͢ • Switch-caseΛຖճॻ͘ඞཁ͕͋Δ • ม׵ॲཧΛ͠ͳ͍৔߹Ͱ΋DBTFจ͕ඞཁʹͳ Δ 2. Result
47. *OGSB 1SFTFOUBUJPO %PNBJO ϩάΠϯ public protocol PublishRepository { func login(email: String, password: String) -> Result<User> } public protocol LoginUseCase { func login(email: String, password: String) -> Result<Void> } public protocol LoginPresenter { func login(email: String, password: String) -> Result<Void> }
48. • ྫ֎ΛPO&SSPSઅʹ౉͢ • catchErrorઅͰΤϥʔϋϯυϦϯά͢Δ • catchErrorઅ͕ͳ͍৔߹͸ͦͷ··ྫ֎͕ ԼྲྀʹྲྀΕΔ 3. RxSwift
49. *OGSB 1SFTFOUBUJPO %PNBJO ϩάΠϯ public protocol PublishRepository { func login(email: String, password: String) -> Single<User> } public protocol LoginUseCase { func login(email: String, password: String) -> Completable } public protocol LoginPresenter { func login(email: String, password: String) -> Completable }
50. *OGSBTUSVDUVSF&SSPS %PNBJO&SSPS 1SFTFOUBUJPO&SSPS DPOOFDUJPO DPOOFDUJPO DPOOFDUJPO QFSNJTTJPO QFSNJTTJPO UFNQPSBSZ1BTTXPSE
    &YQJSFE UFNQPSBSZ1BTTXPSE
    &YQJSFE BQJ3FQPOTF SFTQPOTF SFTQPOTF JOUFSOBM
    TFSWFS
    FSSPS VOLOPXO VOLOPXO USBOTMBUJPO
51. struct PublishRepositoryImpl: PublishRepository { func login(email: String, password: String) -> Single<User> { return apiClient.create( with: PublishRequest(email: email, password: password) ) } } Infrastructure
52. struct LoginUseCaseImpl: LoginUseCase { func login(email: String, password: String) -> Completable { return repository.login(email: email, password: password) .asObservable() .catchError { error -> Observable<User> in return Observable.error(DomainError.create(with: error)) } .flatMap { user -> Observable<Never> in guard user.hasPermission else { throw DomainError.permission } guard !user.isTemporaryPasswordExpired else { throw DomainError.temporaryPasswordExpired } return Observable.empty() } .asCompletable() } } Domain
53. 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
54. ֤ϨΠϠʔͰ ΤϥʔϋϯυϦϯάΛߦ͏
55. ·ͱΊ • ΤϥʔͷೝࣝΛἧ͑Δ͜ͱʹΑΓυΩϡϝ ϯτԽͰ͖Δ • Embedded FrameworkʹΑΓΤϥʔʹ Layerͷ஌ࣝΛ෇༩Ͱ͖Δ • Layerͷܨ͗ࠐΈ͸֤ϓϩμΫτʹ߹Θͤͨ ํ๏Λ࠾༻͠·͠ΐ͏