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
   

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

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

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4. Kyobashi.swift
   

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5. ΤϥʔϋϯυϦϯά
   

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

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7. Α͋͘ΔΤϥʔ
   

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9. Xcode
   

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10. ͱΓ͋͑ͣ࠶ىಈ
    ͢Ε͹͍͍͔
    

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11. ͳͥ࠶ىಈ͠Α͏ͱߟ͑ͨͷ͔ʁ
    աڈʹମݧͨ͜͠ͱ͕͋Δ
    ͦͷࡍʹ࠶ىಈͨ͠Β࣏ͬͨͨΊ
    

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13. ϝʔϧΞυϨε͕
    ؒҧ͍ͬͯΔʁ
    ύεϫʔυ͕
    ؒҧ͍ͬͯΔʁ
    

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14. ϝʔϧΞυϨε͕
    ؒҧ͍ͬͯΔʁ
    ύεϫʔυ͕
    ؒҧ͍ͬͯΔʁ
    αʔϏε
    յΕͯΔʂ
    αʔϏε
    յΕͯΔʂ
    

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15. αʔϏε཭Ε
    

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

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17. View Slide

18. ࣍ʹ͢΂͖ߦಈ͕
    ෼͔Δ
    

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19. ద੾ͳΤϥʔ
    

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20. View Slide

21. ࣍ʹ͢΂͖ߦಈ͕
    ෼͔Βͳ͍
    

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22. ෆద੾ͳΤϥʔ
    

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23. View Slide

24. ϝʔϧΞυϨε͕
    ؒҧ͍ͬͯΔʁ
    ύεϫʔυ͕
    ؒҧ͍ͬͯΔʁ
    αʔϏε
    յΕͯΔʂ
    αʔϏε
    յΕͯΔʂ
    

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25. ࣍ʹ͢΂͖ߦಈ͕
    ෼͔Δ
    

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26. ద੾ͳΤϥʔ
    

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27. ΤϥʔϋϯυϦϯά
    ൃੜͨ͠ΤϥʔʹԠͯ͡ɺϢʔβʔʹݱࡏͷঢ়
    ଶΛࣔ͠ɺඞཁʹԠͯ࣍͡ͷߦಈΛࣔ͢͜ͱ
    

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28. ΤϥʔϋϯυϦϯά͸೉͍͠
    

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

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30. 1. ΤϥʔΛͻͨ͢Βચ͍ग़͢
    ൈ͚࿙Ε͸ڐ༰͢Δ
    

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31. 2. ΤϥʔΛ෼ྨ͢Δ
    

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

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33. Layered Architecture
    *OGSBTUSVDUVSF
    1SFTFOUBUJPO
    %PNBJO
    

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

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

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36. Layered Architectureͷݪଇ
    ԼͷϨΠϠʔͷਓ͸্ͷϨΠϠʔ͕ެ։͍ͯ͠
    ΔJOUFSGBDF͚ͩΛ஌͍ͬͯΔ
    

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37. ݪଇʹ൓ͯ͠ࢀরͰ͖Δ
    *OGSBTUSVDUVSF
    1SFTFOUBUJPO
    %PNBJO
    

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38. Embedded Framework
    *OGSBTUSVDUVSF
    1SFTFOUBUJPO
    %PNBJO
    

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

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

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41. InfrastructureErrorΛ
    Presentationʹ఻ൖͰ͖ͳ͍
    InfrastructureErrorΛ
    DomainErrorʹม׵͢Δඞཁ͕͋Δ
    

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

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

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

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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
    }
    

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

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

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49. *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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50. *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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51. struct PublishRepositoryImpl: PublishRepository {
    func login(email: String, password: String) -> Single {
    return apiClient.create(
    with: PublishRequest(email: email, password: password)
    )
    }
    }
    Infrastructure
    

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52. 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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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
    

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54. ֤ϨΠϠʔͰ
    ΤϥʔϋϯυϦϯάΛߦ͏
    

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

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