iOS アプリエラー監視の設計とその効果

J04ΞϓϦΤϥʔ؂ࢹͷ  ઃܭͱͦͷޮՌ

"CPVUNF

,VOJXBL גࣜձࣾ%JWFSTFͷJ04ςοΫϦʔυɻ  ͱ͋ΔΞϓϦͷϦχϡʔΞϧϓϩδΣΫτʹ  ్த͔ΒՃΘͬͨ΋ͷͷɺςετࠔ೉ͳઃܭΛ  ໨ͷ౰ͨΓʹͨͨ͠ΊɺཪϦχϡʔΞϧΛ։࢝ɻ  ࠷ऴతʹςετΛಋೖ͠ɺ։ൃ଎౓Λഒʹͨ͠ɻ झຯ͸5%%ɻ

Τϥʔ؂ࢹͱ͸

w ΞϓϦͰൃੜͨ͠ΤϥʔΛαʔόʹૹΔͳͲͯ͠  Τϥʔͷൃੜ਺ͳͲΛ؂ࢹ͢Δٕज़ w ྫ͑͹ɺΞϓϦ͕Ϋϥογϡͨ͠ΒϨϙʔτΛ  ඈ͹͢ΫϥογϡϨϙʔτ͸͜ͷҰछ w ΫϥογϡϨϙʔτղੳαʔϏεͰ͸  $SBTIMZUJDT͕༗໊

Τϥʔͷൃੜ਺΍66 Τϥʔͷ*% ΤϥʔͷΧςΰϦ Τϥʔൃੜ਺ͷ࣌ؒతਪҠ Τϥʔൃੜ࣌ͷσόΠε Τϥʔൃੜ࣌ͷ04

w ࣮͸ɺଟ͘ͷΫϥογϡϨϙʔταʔϏε͸  ΫϥογϡҎ֎ͷΤϥʔ΋؂ࢹͰ͖Δ w ྫ͑͹ɺ8FC"1*ݺͼग़࣌͠ͷΤϥʔ΍ɺ  ಺෦ঢ়ଶͷෆ੔߹ͳͲͷΤϥʔ΋؂ࢹͰ͖Δ ૹ৴ͷ࢓ํ͸ޙͰ঺հ͠·͢

Τϥʔ؂ࢹͷಛੑ

w Τϥʔ؂ࢹͷಛੑ͸ҎԼͷͭɿ w ඇৗʹ޿ൣͳόάΛݕ஌Ͱ͖Δ w Τϯόά͔Βൃݟ·Ͱͷ͕࣌ؒ௕͍

όάΛݟ͚ͭΔͨΊͷखஈ ߏจϋΠϥΠτ Ϧϯτ ੩తܕݕࠪ ୯ମɾ݁߹ςετ 6*ςετ ςελʔʹΑΔಈ࡞֬ೝ Τϥʔ؂ࢹ Ϣʔβʔ͔Βͷ͓໰͍߹Θͤ

όά9Λݟ͚ͭΒΕΔ৔ॴ όά9 ߏจϋΠϥΠτ Ϧϯτ ੩తܕݕࠪ ୯ମɾ݁߹ςετ 6*ςετ ςελʔʹΑΔಈ࡞֬ೝ Τϥʔ؂ࢹ Ϣʔβʔ͔Βͷ͓໰͍߹Θͤ

όά9 ߏจϋΠϥΠτ Ϧϯτ ੩తܕݕࠪ ୯ମɾ݁߹ςετ 6*ςετ ςελʔʹΑΔಈ࡞֬ೝ Τϥʔ؂ࢹ Ϣʔβʔ͔Βͷ͓໰͍߹Θͤ ্ͷํͰࢭ·Δͱ
ݪҼڀ໌ͷ͕࣌ؒ୹͍ όά: ಛघͳΤϥʔ͸ԼͷํͰ  ͔͠ݟ͚ͭΒΕͳ͍

ߏจϋΠϥΠτ Ϧϯτ ੩తܕݕࠪ ୯ମɾ݁߹ςετ 6*ςετ ςελʔʹΑΔಈ࡞֬ೝ Τϥʔ؂ࢹ Ϣʔβʔ͔Βͷ͓໰͍߹Θͤ Τϥʔ؂ࢹ͸ಛघͳ  ΤϥʔΛݟ͚ͭΒΕΔ 
΄΅࠷ޙͷࡆ όά: ͔͠͠ɺ্ͷ૚ΑΓ΋  Τϯόά͔Βൃݟ·Ͱͷ  ͕࣌ؒͱͯ΋௕͍

Τϥʔ؂ࢹͰݟ͚ͭΔ΂͖  Τϥʔͱ͸

ߏจϋΠϥΠτ Ϧϯτ ੩తܕݕࠪ ୯ମɾ݁߹ςετ 6*ςετ ςελʔʹΑΔಈ࡞֬ೝ Τϥʔ؂ࢹ Ϣʔβʔ͔Βͷ͓໰͍߹Θͤ ༧໿ޠλΠϙ ม਺໊λΠϙ
ϓϩύςΟ໊  λΠϙ ෼ذߟྀ࿙Ε ίϯϙʔωϯτ  ࢓༷ͷෆ੔߹ ࢓༷΁ͷޡղ ಛघͳ؀ڥͰ͔͠  ࠶ݱ͠ͳ͍Τϥʔ ҋ ཧ૝ͷόάݕ஌ͷ࢟

ϓϩύςΟ໊  λΠϙ ෼ذߟྀ࿙Ε ίϯϙʔωϯτ  ࢓༷ͷෆ੔߹ ࢓༷΁ͷޡղ ಛघͳ؀ڥͰ͔͠  ࠶ݱ͠ͳ͍Τϥʔ ҋ όά͕Լͷ૚·Ͱ  ಥ͖ൈ͚ͯ͠·͏ͷͰ  ݪҼڀ໌ʹ͕͔͔࣌ؒΔ μϝͳόάݕ஌ͷ࢟

ϓϩύςΟ໊  λΠϙ ෼ذߟྀ࿙Ε ίϯϙʔωϯτ  ࢓༷ͷෆ੔߹ ࢓༷΁ͷޡղ ಛघͳ؀ڥͰ͔͠  ࠶ݱ͠ͳ͍Τϥʔ ҋ ཧ૝ͷόάݕ஌ͷ࢟

ϓϩύςΟ໊  λΠϙ ෼ذߟྀ࿙Ε ίϯϙʔωϯτ  ࢓༷ͷෆ੔߹ ࢓༷΁ͷޡղ ಛघͳ؀ڥͰ͔͠  ࠶ݱ͠ͳ͍Τϥʔ ҋ Τϥʔ؂ࢹͰݕ஌͢΂͖  Τϥʔ͸͜ͷ͋ͨΓ

͜͜·Ͱͷ·ͱΊ w Τϥʔ؂ࢹ͸ಛघͳόάΛ  ݕ஌͢ΔͨΊͷखஈ w ͳ͓ɺͦͷલͷखஈͰόάΛ  ݟ͚ͭΒΕΔͳΒͦͷํ͕  ݪҼڀ໌Λ଎͘Ͱ͖Δ

Τϥʔ؂ࢹͷ࣮૷ํ๏

Τϥʔ؂ࢹαʔϏεͷ"1*Λ೺Ѳ͢Δ ΤϥʔϨϙʔλʔΛΧελϚΠζ͢Δ ΤϥʔϨϙʔλʔΛ૊ΈࠐΉ

Τϥʔ؂ࢹαʔϏεͷ  "1*Λ೺Ѳ͢Δ

Crashlytics.sharedInstance().recordError(error) $SBTIMZUJDTʹΤϥʔΛૹ৴͢Δίʔυ &SSPSͰ͸ͳ͘/4&SSPSͳͷͰ஫ҙ

ΤϥʔϨϙʔλʔΛ  ΧελϚΠζ͢Δ

౎౓/4&SSPSʹม׵͢Δͷ͸  ໘౗ͳͷͰɺ4XJGUͷ&SSPSΛ  /4&SSPS΁͍͍ײ͡ʹ  ม׵ͯ͘͠ΕΔϥούʔΛॻ͘ $SBTIMZUJDTͷ৔߹

class CrashlyticsErrorReporter { private let crashlytics = Crashlytics.sharedInstance() func report(error:
Error, from reporter: Any) { #if DEBUG let prefix = "DEBUG " #else let prefix = "" #endif let detailedError = NSError( domain: "\(prefix)\(type(of: reporter))", code: CrashlyticsErrorTracker.getNSErrorCode(bySwiftError: error), userInfo: [ NSLocalizedDescriptionKey: "\(error)", ] ) self.crashlytics.recordError(detailedError) } private static func getNSErrorCode(bySwiftError error: Error) -> Int { let bridgedError = error as NSError return bridgedError.code } } %&#6(ϏϧυΛ۠ผͰ͖ΔΑ͏ʹ͓ͯ͘͠ͱ  ຊ൪؀ڥͱ։ൃ؀ڥΛ۠ผ͠΍͘͢ͳΔ ΤϥʔϨϙʔλʔʹͲͷΑ͏ʹ  ूܭ͞ΕΔ͔Λҙࣝ͢Δ ྫ͑͹ɺ$SBTIMZUJDT͸/4&SSPSͷ  EPNBJOͱDPEFͷ૊ͰΤϥʔΛ  άϧʔϐϯά͢ΔͷͰɺͦΕͧΕ  Τϥʔ*%ͱൃੜݩΛࢦఆ͢Δͱ  ៉ྷʹΤϥʔ͕·ͱ·Δ Τϥʔͷશจ͸άϧʔϐϯάʹ࢖Θͳ͍Α͏ʹ͢Δ  ʢϢʔβʔ*%ͱ͔͕ೖΔͱݸผͷΤϥʔʹͳͬͯ  ૯਺Λ೺ѲͰ͖ͳ͘ͳΔͷͰʣ $SBTIMZUJDT༻ͷΤϥʔϨϙʔλʔΛ࡞੒ SFQPSUؔ਺ΛݺͿͱΤϥʔϨϙʔτ͕  ૹ৴͞ΕΔΑ͏ʹ࣮૷͍ͯ͠Δ ΤϥʔͱҰॹʹൃੜݩ͕  Θ͔ΔΑ͏ʹ͓ͯ͘͠ͱ  ݪҼͷݟ౰͕͖ͭ΍͘͢ͳΔ

ΤϥʔϨϙʔλʔΛ  ૊ΈࠐΉ

Α͘ΈΔ૊ΈࠐΈํ๏

class UserApiRepository: UserRepositoryProtocol { private let api: GitHubApiClientProtocol func get(by
id: GitHubUser.Id) -> Promise<GitHubUser> { return self.api .fetch( endpoint: GitHubApiEndpoint(path: "/user/" + id.text), headers: [:], parameters: [] ) .then { data -> GitHubUser in let response: GitHubUserResponse = try unbox(data: data) return response.user } .catch { error in ErrorReporter.shared.report( error: error, reporter: self ) } } } Τϥʔ͕ฦ͖ͬͯͨΒ  ΤϥʔϨϙʔτΛૹ৴  ʢͭ·Γϋʔυίʔυʣ "1*ݺͼग़͠ͷίʔυ

w ͔͠͠ϋʔυίʔυʹ͸໰୊͕ଟ͍ɿ w "1*ͷݺͼग़͠ʹؔ܎ͷͳ͍ίʔυ͕ೖΔͨΊ  ୯Ұ੹຿ݪଇʹҧ൓͢Δ w ୯ମςετͰΤϥʔϨϙʔτ͕ૹΒΕͯ͠·͏ w ςετ͚࣌ͩ༗ޮͳϑϥάΛ௥Ճͯ͠  ΤϥʔϨϙʔτΛૹ৴͠ͳ͍Α͏ʹ 
Ͱ͖ͳ͘͸ͳ͍͕΍Γͨ͘ͳ͍

ͦ͜Ͱ0CTFSWFSύλʔϯ

w 0CTFSWFSύλʔϯͰ͸ɺ؂ࢹऀ͕؂ࢹର৅ͷ  ঢ়ଶมԽΛ࡯஌ͯ͠ಈ࡞͢Δ w ΤϥʔϨϙʔτʹԠ༻͢Δͱɿ w ؂ࢹऀ͸ΤϥʔϨϙʔλʔ w ؂ࢹର৅͸Τϥʔ͕ൃੜ͠͏ΔΦϒδΣΫτ w
0CTFSWFSύλʔϯΛ࢖͑͹ϋʔυίʔυͷ  ໰୊఺ΛղফͰ͖Δ

Τϥʔͷൃੜݯ Τϥʔ͕ൃੜ͠·ͨ͠ ΤϥʔϨϙʔλʔ ؂ࢹ

Τϥʔͷൃੜݯ ΤϥʔϨϙʔλʔ ؂ࢹ Τϥʔ͕ى͖ͨͷͰ  ΤϥʔϨϙʔτΛ  ૹ৴͠·͢

Τϥʔͷൃੜݯ ΤϥʔϨϙʔλʔ ΤϥʔϨϙʔτૹ৴  ͷ੹຿ Τϥʔ͕ى͜Γ͏Δ  ॲཧͷ੹຿

Τϥʔͷൃੜݯ ΤϥʔϨϙʔλʔ ςετͷͱ͖͸  ΤϥʔϨϙʔλʔ  ΛऔΓ෇͚ͳ͍

w ͨͩ͠ɺ0CTFSWFSύλʔϯΛ࢖͑Δ৔ॴ͸  ݶΒΕ͍ͯΔ w ؂ࢹର৅͕؂ࢹՄೳͳΠϯλʔϑΣʔεΛ  උ͍͑ͯͳ͍ͱ͍͚ͳ͍ͨΊ w .7 ΞʔΩςΫνϟͳΒɺ.PEFM͸؂ࢹՄೳͳ  ΠϯλʔϑΣʔεΛ͍࣋ͬͯΔ͸ͣͳͷͰɺ.PEFMʹ 
ΤϥʔϨϙʔλʔΛ૊ΈࠐΈ΍͍͢͸ͣ w 'MVYΞʔΩςΫνϟͷ৔߹͸4UPSF͕؂ࢹՄೳͳ  ΠϯλʔϑΣʔεΛ͍࣋ͬͯΔ͸ͣ

.PEFM 7JFX &SSPS3FQPSUFS ؂ࢹ ؂ࢹ Τϥʔ͕ൃੜ͠·ͨ͠

.PEFM 7JFX &SSPS3FQPSUFS ؂ࢹ ؂ࢹ ΤϥʔΛදࣔ͠·͢ ΤϥʔϨϙʔτΛ  ૹ৴͠·͢

func fetch() { switch self.currentState { case .fetching: return case
.fetched: self.stateMachine.transit(to: .fetching) self.repository.get(by: self.id) .then { user in self.stateMachine.transit(to: .fetched( result: .success(user) )) } .catch { error in self.stateMachine.transit(to: .fetched( result: .failure(.unspecified(debugInfo: "\(error) )) } } } ͜ͷ.PEFM͸"1*ݺͼग़͕͠Τϥʔʹ  ͳͬͨΒΤϥʔঢ়ଶ΁มԽ͢Δ ͦͷͨΊɺΤϥʔϨϙʔλʔ͔Β؂ࢹ͠΍͍͢ .PEFM૚ͷ"1*ݺͼग़͠ͷίʔυ ͜ͷΑ͏ͳ.PEFM૚ͷઃܭͷৄࡉ͸IUUQTHPPHM1G'+-Λࢀর͍ͯͩ͘͠͞

class UserModelErrorReporter { private let model: UserModelProtocol private let errorReporter:
ErrorReporterProtocol private let disposeBag = RxSwift.DisposeBag() init( observing model: UserModelProtocol, reportingBy errorReporter: ErrorReporterProtocol ) { self.model = model self.errorReporter = errorReporter self.model.didChange .subscribe(onNext: { [weak self] (state: UserModelState) in guard let `self` = self else { return } switch state { case let .fetched(result: .failure(error)): self.errorReporter.report(error: error, reporter: self) default: return } }) .disposed(by: disposeBag) } } .PEFM͕Τϥʔঢ়ଶʹͳͬͨΒ  ΤϥʔϨϙʔτΛૹ৴ .PEFMͷঢ়ଶભҠΛ؂ࢹ .PEFMΛ؂ࢹ͢ΔΤϥʔϨϙʔλʔΛ࡞੒

͜͜·Ͱͷ·ͱΊ w Τϥʔ؂ࢹͷ࣮૷ํ๏ʹ͸  0CTFSWFSύλʔϯ͕ద͍ͯ͠Δ w .PEFM΍4UPSFΛ؂ࢹ͢ΔͱΑ͍

Τϥʔ؂ࢹͷίπ

Τϥʔ؂ࢹΛ։࢝͢Δͱ  ࠔౕ͕ͬͨͪΐͪ͘ΐ͘ग़ͯ͘Δ

Fatal Exception: SomethingError *** nil ৘ใྔ͕΄ͱΜͲͳ͍ʂ

Τϥʔʹ͸ͳΔ΂͘  ΫϦςΟΧϧͳ৘ใΛ٧ΊΑ͏

func example(input: String) -> String? { guard validate1(input) else {
return nil } guard validate2(input) else { return nil } guard validate3(input) else { return nil } return "OK! Hello \(input)" } ݪҼڀ໌Λ஗͘͢Δѱ͍ྫ ࣦഊͨ͠ݪҼ͕۠ผͰ͖ͳ͍

enum ExampleError: Error { case validate1(debugInfo: String) case validate2(debugInfo: String)
case validate3(debugInfo: String) } ͦ͏͍͏࣌͸FOVNͰΤϥʔΛ۠ผͰ͖ΔΑ͏ʹ͢Δ

func example(input: String) -> Result<String> { guard validate1(input) else {
return .failure(.validate1(debugInfo: input)) } guard validate2(input) else { return .failure(.validate2(debugInfo: input)) } guard validate3(input) else { return .failure(.validate3(debugInfo: input)) } return .success("OK! Hello \(input)") } ΤϥʔΛ۠ผ͠΍͍͢Α͍ྫ ࣦഊͨ͠ݪҼ͕۠ผͰ͖Δ ࣦഊͨ͠ࡍͷೖྗ΋ೖखͰ͖Δ

Τϥʔ؂ࢹͷ݁Ռ

w ϢʔβʔͷखݩͰൃੜ͍ͯ͠Δόάͷछྨ΍  ن໛Λ೺ѲͰ͖ΔΑ͏ʹͳͬͨ w छྨ΍ن໛͕೺ѲͰ͖ΔΑ͏ʹͳΔͱɺόάमਖ਼ͷ  τϦΞʔδΛ΍Γ΍͘͢ͳΔ w ՝ۚܥ͸࠷༏ઌͱ͔ɺΤϥʔ਺ͷଟ͍΋ͷ  ͔ΒରॲͳͲ

w ϢʔβʔͷखݩͰ͸༧૝֎ͷΤϥʔ͕ى͍ͬͯͨ͜ w ςελʔʹΑΔಈ࡞֬ೝͱ͸؀ڥ͕  ҟͳ͍ͬͯͨͨΊɺൃݟͰ͖ͳ͔ͬͨΑ͏ͩ w ໘ന͍͜ͱʹɺ"QQMFͷϨϏϡʔΞ͕ૺ۰ͨ͠  όάͷݪҼڀ໌ʹ΋໾ཱͬͨ w 4BOECPYͷϨγʔτ͡Όͳ͍ͱ࠶ݱ͠ͳ͍ 
όάͩͬͨ

w خ͍͠෭࡞༻ͱͯ͠ɺςελʔͷૺ۰ͨ͠όάͷ  ৄࡉ͕ೖखͰ͖ΔΑ͏ʹͳͬͨ w ςελʔͷಈ࡞֬ೝதʹΤϥʔϨϙʔτ͕  ඈΜͰ͘ΔͨΊʢ%&#6(ϏϧυͳͷͰ͙͢Θ͔Δʣ w σόοά͕͍͢͝ḿΓ·͢

·ͱΊ w Τϥʔ؂ࢹʹΑΓɺςελʔʹΑΔಈ࡞֬ೝͰ΋  ݟ͚ͭΒΕͳ͔ͬͨΤϥʔΛൃݟͰ͖ΔΑ͏ʹ  ͳͬͨ w ઃܭͷίπ͸ҎԼͷͭɿ w 0CTFSWFSύλʔϯΛ࢖͏ w
ͳΔ΂͘Τϥʔ৘ใΛΘ͔Γ΍͘͢͢Δ

એ఻ w %JWFSTFͰ͸৽نࣄۀͷJ04։ൃνʔϜͷ  νʔϜϦʔμʔΛืू͍ͯ͠·͢ʂ w ੒௕தͷαʔϏεΛࣗ෼ͷྗͰಋ͍ͯΈ͍ͨͱ  ࢥ͏ํʹɺͥͻ͖ͯ΄͍͠ͱࢥ͍ͬͯ·͢ʂ w ͝ڵຯ͕͋Γ·ͨ͠ΒɺҰॹʹϥϯνʹ  ߦ͖·ͤΜ͔ʁ

iOS アプリエラー監視の設計とその効果

iOS アプリエラー監視の設計とその効果

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