Go design theory learned from Kubernetes

Transcript

1. ©2021 Wantedly, Inc.
   Kubernetes ͔ΒֶΜͩ
   

   Go ͷઃܭ࿦
   (P$POGFSFODF4QSJOH 0OMJOF
   
   "QS 5BLBNJDIJ0NPSJ!POTE@
   

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2. ©2021 Wantedly, Inc.
   Takamichi Omori @onsd_
   DX Squad Intern, Wantedly, Inc.
   Love Kubernetes, Go, etc
   *BN
   2
   https://www.wantedly.com/id/onsd_
   

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   8BOUFEMZͱ(P
   ຊ൪ͷ͸(P
   ύϑΥʔϚϯε͕༏ઌ͞ΕΔͱ͜Ζ
   ௨஌؅ཧͳͲͷج൫
   Kubernetes ؔ࿈
   CLIπʔϧ
   3
   

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   %94RVBEͱ͸ʁ
   %FWFMPQFSF9QFSJFODF4RVBE
   https://event.cloudnativedays.jp/cndo2021/talks/281
   ٕज़ج൫νʔϜͱ঺հ͞ΕΔ͜ͱ΋ଟ͍Ͱ͢
   ະདྷͷ։ൃମݧΛͭ͘Δ
   ։ൃऀͷੜ࢈ੑΛ޲্ͤ͞ΔͨΊʹ͸ԿͰ΋΍͍ͬͯ͘νʔϜ
   ৽͍͠ Microservice ͷ։ൃମݧ
   ෳࡶͳMicroservice Ͱ΋։ൃ͕؆୯ʹߦ͑ΔΑ͏ͳ࢓૊Έ࡞Γ
   ৽͍͠։ൃମݧ ʹ͍ͭͯৄ͘͠͸
   4
   

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   ࠓ೔࿩͢͜ͱ
   ,VCFSOFUFT͔ΒֶΜͩ(Pͷઃܭ࿦
   5
   ࣮ྫɿCustom Controller ͷ࣮૷͔ΒֶΜͩઃܭ࿦
   • Package Λ෼͚ͯॲཧΛΘ͔Γ΍͘͢͢Δํ๏
   • εφοϓγϣοτςετʹ͍ͭͯ
   

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6. ©2021 Wantedly, Inc.
   $VTUPN$POUSPMMFSͱ͸
   Photo by NeONBRAND on Unsplash
   6
   

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   $VTUPN$POUSPMMFSͱ͸
   ,VCFSOFUFTΛ֦ு͢Δ࢓૊ΈͷҰͭ
   https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/ 7
   Kubernetes ʹ͸ Deployment, Service ͷΑ͏ʹͨ͘͞ΜͷϦιʔε͕ଘࡏ͢Δ
   Custom Controller ͸ɺಠࣗʹઃܭͨ͠ϦιʔεΛίϯτϩʔϧ͢ΔͨΊͷΞϓϦέʔγϣϯ
   

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8. ©2021 Wantedly, Inc.
   ୊ࡐͱ͢Δ Custom Controller ͷಛ௃
   Photo by Nikolai Chernichenko on Unsplash
   8
   

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   ୊ࡐͱ͢Δ$VTUPN$POUSPMMFSͷಛ௃
   πϦʔߏ଄ʹͳ͍ͬͯΔ
   9
   ਌͔Βෳ਺ͷϦιʔε͕Ͱ͖Δ
   

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    ୊ࡐͱ͢Δ$VTUPN$POUSPMMFSͷಛ௃
    ਌ϦιʔεҎ֎͔ΒӨڹΛड͚ΔϦιʔε͕͋Δ
    ผϦιʔε͕มߋ͞Εͨͱ͖ʹࢠϦιʔεΛมߋ͢Δ controller Λผʹ࡞Δඞཁ͕͋Δ
    10
    

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11. ©2021 Wantedly, Inc.
    ෳࡶͳ controller ͸ ϨΠϠʔΛ෼͚Α͏
    Photo by Hasan Almasi on Unsplash 11
    

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    3FDPODJMF
    3FDPODJMF
    ͋ΔϦιʔεͷঢ়ଶ͔ΒΫϥελͷঢ়ଶΛߋ৽͢Δॲཧ
    
    
    

    Kubebuilder Λ࢖͍ͬͯΔ৔߹ɺ
    

    ඞཁͳϦιʔεΛ࡞੒͢ΔॲཧΛReconcile ʹॻ͘
    12
    

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    ૉ௚ʹॻ͍͍ͯͬͨ৔߹
    3FDPODJMFʹ͢΂ͯΛॻ͘ੈք
    1. ཧ૝తͳϦιʔεͷঢ়ଶΛܭࢉ
    
    
    2. ࠩ෼͕͋Δ৔߹͸ߋ৽
    
    
    3. ඞཁ͕ͳ͘ͳͬͨϦιʔε͕͋Δ৔߹͸ফ͢
    

    ࠓճͷྫͩͱɺෳ਺ͷϦιʔεΛ࡞੒ɾߋ৽ɾ࡟আ
    

    ͢Δඞཁ͕͋ͬͨ
    13
    

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    ୊ࡐͱ͢Δ$VTUPN$POUSPMMFSͷಛ௃
    ਌ϦιʔεҎ֎͔ΒӨڹΛड͚ΔϦιʔε͕͋Δ
    ผϦιʔε͕มߋ͞Εͨͱ͖ʹࢠϦιʔεΛมߋ͢Δ controller Λผʹ࡞Δඞཁ͕͋Δ
    14
    

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    ෳ਺ͷDPOUSPMMFSΛؚΉ৔߹ͷ໰୊఺
    3FDPODJMFʹ͢΂ͯΛॻ͘
    ෳ਺ͷController ͔Β
    

    ߋ৽͞ΕΔϦιʔε͕͋Δ
    
    
    

    Reconciler ʹ௚઀ॲཧΛॻ͘ͱɺ
    

    ಉ͡ॲཧ͕ෳ਺ͷՕॴͰॏෳͯ͠͠·͏
    15
    

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    6QEBUFSͷಋೖ
    6QEBUFS
    ಛఆͷϦιʔεΛ࡞੒ɾߋ৽ɾ࡟আ͢ΔྲྀΕΛ·ͱΊͯ
    

    Updaterͱ࣮ͯ͠૷͢Δ
    
    
    Controller ʹ௚઀ॻ͍ͨ৔߹ͱൺ΂ͯɺॲཧͷڞ௨Խ
    ͕ਤΕΔ
    
    
    16
    

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    6QEBUFSͷJOUFSGBDF
    6QEBUFS
    17
    // type NamespacedName struct
    {
    
    /
    /
    Namespace strin
    g
    
    /
    /
    Name strin
    g
    
    //
    }
    
    type Updater interface
    {
    
    Update(ctx context.Context, 

    slug types.NamespacedName) erro
    r
    
    /
    /
    ListOption is used specify namespac
    e
    
    UpdateAll(ctx context.Context,
    
    
    opts ...client.ListOption) erro
    r
    
    }
    
    

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    6QEBUFS͕શͯͷॲཧΛߦ͏ͱ͖ͷ໰୊఺
    ͢΂ͯͷ৚݅Λ໢ཏ͢Δͷ͕େม
    ӈͷྫͩͱɺ࡟আ͢Δॲཧ·ͰUpdaterͰ΍͍ͬͯΔɻ
    
    
    - ࡟আ͢Δ৚݅
    
    
    - ԿΛͲ͜·Ͱফ͍͍ͯ͠ͷ͔
    
    
    ͳͲ͕Θ͔ΓͮΒ͘ͳΓɺ࣮૷͕େมʹͳΔɻ
    18
    

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    3FGSFTIFSͷಋೖ
    3FGSFTIFS
    ཧ૝తͳϦιʔεͷঢ়ଶ͕౉͞ΕΔͱɺΫϥελ্ͷ
    

    Ϧιʔε͕ཧ૝తͳঢ়ଶʹͳΔΑ͏ʹ
    

    ௥Ճɾߋ৽ɾ࡟আΛߦ͏ϢʔςΟϦςΟϥΠϒϥϦ
    
    
    19
    

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    3FGSFTIFSͷJOUFSGBDF
    3FGSFTIFS
    20
    ࣮ࡍ͸ϨΠϠʔͱ͍͏ΑΓϥΠϒϥϦ
    // util.Object represents Kubernetes Resourc
    e
    
    type Refresher interface
    {
    
    Refresh(ctx context.Context
    ,
    
    parent util.Object, children []util.Object) erro
    r
    
    }
    
    

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    3FGSFTIFS͕͋ΔͱԿ͕خ͍͠ͷ͔
    ໰୊ͷ؆ུԽ
    ཧ૝ঢ়ଶΛड͚औΓɺෆཁͳϦιʔε͸࡟আ͢Δ
    RefresherΛಋೖ͢Δ͜ͱͰ
    

    UpdaterΛ࣮૷͢Δࡍʹඞཁͳͷ͸ɺཧ૝తͳ
    ϦιʔεͷϦετΛ࡞Δॲཧ͚ͩʹͳͬͨ
    21
    ॲཧͷڞ௨Խ
    Ϧιʔεʹ਌ࢠؔ܎͕͋Δ৔߹ɺRefresherΛ
    

    ࢖͏͜ͱͰॲཧͷڞ௨Խ͕Ͱ͖Δ
    

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    3FGSFTIFS͕ݱঢ়Λཧ૝ʹ͚ۙͮΔํ๏
    ࡟আ͢ΔϦιʔεͷಛఆ
    Refresher ͸ɺ਌Ϧιʔεͱཧ૝తͳࢠϦιʔεͷ
    

    ϦετΛड͚औΔ
    
    
    ਌Ϧιʔε͔Β͢Ͱʹଘࡏ͢ΔࢠϦιʔεΛಛఆ͠ɺ
    

    ड͚औͬͨϦιʔεͱൺֱ͢Δ͜ͱͰ࡟আ͢Δ΂͖
    

    ϦιʔεΛಛఆͰ͖Δ
    ਌ࢠؔ܎ͷ੍໿
    ͋ΔϦιʔε͸ඞͣ਌ϦιʔεΛ࣋ͭͱ͍͏੍໿
    
    
    22
    

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    ,VCFSOFUFT্Ͱ਌ࢠؔ܎Λࣔ͢ํ๏
    0XOFS3FGFSFODF
    23
    Ϧιʔεʹ͍ͭͯɺͦͷΦʔφʔϦιʔεΛࣔ͢ϑΟʔϧυ
    OwnerReference ͷϝϦοτ
    Owner ͕ফ͑ͨͱ͖ʹGC ͕ࢠϦιʔεΛফͯ͘͠ΕΔ
    πϦʔߏ଄Λ࣋ͭϦιʔεΛ؅ཧ͢Δͱ͖͚͓ͭͯ͘ͱศར
    

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    #VJMEFSͷಋೖ
    #VJMEFS
    • ͋ΔϦιʔεʹ͍ͭͯɺཧ૝తͳঢ়ଶΛܭࢉ͢Δ
    
    
    • ܭࢉͨ݁͠ՌΛRefresherʹΘͨ͢
    
    
    24
    

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    #VJMEFSͷJOUFSGBDF
    #VJMEFS
    • ͋ΔϦιʔεʹ͍ͭͯɺཧ૝తͳঢ়ଶΛܭࢉ͢Δ
    
    
    • ܭࢉͨ݁͠ՌΛRefresherʹΘͨ͢
    
    
    25
    // util.Object represents Kubernetes Resourc
    e
    
    type Builder interface
    {
    
    Build(ctx context.Context) ([]util.Object, error
    )
    
    }
    

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    ϨΠϠʔ෼͚ͷ·ͱΊ
    Updater
    Builder
    Refresher
    ͋ΔϦιʔεʹ͍ͭͯͷॲཧΛ·ͱΊΔ
    ͋ΔϦιʔεʹ͍ͭͯɺཧ૝తͳঢ়ଶΛͭ͘Δ
    Builder͕౉͢Ϧετʹଇͬͯ
    ཧ૝తͳঢ়ଶΛ࣮ݱ͢ΔϥΠϒϥϦ
    26
    

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    ϨΠϠʔ෼͚ͷ۩ମྫ
    27
    // type virtualServiceUpdater struct
    {
    
    // client client.Clien
    t
    
    // log logr.Logge
    r
    
    // scheme *runtime.Schem
    e
    
    //
    }
    
    func (r virtualServiceUpdater) Update(ctx context.Context,

    serviceSlug types.NamespacedName) error
    {
    
    service := &corev1.Service{
    }
    
    if err := r.client.Get(ctx, serviceSlug, service); err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    objList, err := lister.

    NewVirtualServiceBuilder(r.client, serviceSlug).Build(ctx
    )
    
    if err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    ref := refresh.New(r.client, r.scheme
    )
    
    if err := ref.Refresh(ctx, service, objList); err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    return ni
    l
    
    }
    

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    VirtualServiceUpdater
    ͋Δ service ʹඥͮ͘
    

    virtualService Λ࡞੒͢Δ
    

    Updater
    ϨΠϠʔ෼͚ͷ۩ମྫ
    28
    // type virtualServiceUpdater struct
    {
    
    // client client.Clien
    t
    
    // log logr.Logge
    r
    
    // scheme *runtime.Schem
    e
    
    //
    }
    
    func (r virtualServiceUpdater) Update(ctx context.Context,

    serviceSlug types.NamespacedName) error
    {
    
    service := &corev1.Service{
    }
    
    if err := r.client.Get(ctx, serviceSlug, service); err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    objList, err := lister.

    NewVirtualServiceBuilder(r.client, serviceSlug).Build(ctx
    )
    
    if err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    ref := refresh.New(r.client, r.scheme
    )
    
    if err := ref.Refresh(ctx, service, objList); err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    return ni
    l
    
    }
    

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    VirtualServiceUpdater
    ͋Δ service ʹඥͮ͘
    

    virtualService Λ࡞੒͢Δ
    

    Updater
    ϨΠϠʔ෼͚ͷ۩ମྫ
    29
    // type virtualServiceUpdater struct
    {
    
    // client client.Clien
    t
    
    // log logr.Logge
    r
    
    // scheme *runtime.Schem
    e
    
    //
    }
    
    func (r virtualServiceUpdater) Update(ctx context.Context,

    serviceSlug types.NamespacedName) error
    {
    
    service := &corev1.Service{
    }
    
    if err := r.client.Get(ctx, serviceSlug, service); err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    objList, err := lister.

    NewVirtualServiceBuilder(r.client, serviceSlug).Build(ctx
    )
    
    if err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    ref := refresh.New(r.client, r.scheme
    )
    
    if err := ref.Refresh(ctx, service, objList); err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    return ni
    l
    
    }
    VirtualServiceBuilder
    VirtualServiceʹ͍ͭͯɺ
    

    ཧ૝తͳঢ়ଶΛ࡞Δ Builder
    

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    VirtualServiceUpdater
    ͋Δ service ʹඥͮ͘
    

    virtualService Λ࡞੒͢Δ
    

    Updater
    ϨΠϠʔ෼͚ͷ۩ମྫ
    30
    // type virtualServiceUpdater struct
    {
    
    // client client.Clien
    t
    
    // log logr.Logge
    r
    
    // scheme *runtime.Schem
    e
    
    //
    }
    
    func (r virtualServiceUpdater) Update(ctx context.Context,

    serviceSlug types.NamespacedName) error
    {
    
    service := &corev1.Service{
    }
    
    if err := r.client.Get(ctx, serviceSlug, service); err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    objList, err := lister.

    NewVirtualServiceBuilder(r.client, serviceSlug).Build(ctx
    )
    
    if err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    ref := refresh.New(r.client, r.scheme
    )
    
    if err := ref.Refresh(ctx, service, objList); err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    return ni
    l
    
    }
    VirtualServiceBuilder
    VirtualServiceʹ͍ͭͯɺ
    

    ཧ૝తͳঢ়ଶΛ࡞Δ Builder
    Refresher
    ϦιʔεͷϦετΛड͚औΓ
    

    Ϋϥελͷঢ়ଶΛ߹ΘͤΔ
    

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    ϨΠϠʔ෼͚ͷ۩ମྫ
    31
    // type virtualServiceUpdater struct
    {
    
    // client client.Clien
    t
    
    // log logr.Logge
    r
    
    // scheme *runtime.Schem
    e
    
    //
    }
    
    func (r virtualServiceUpdater) Update(ctx context.Context,

    serviceSlug types.NamespacedName) error
    {
    
    service := &corev1.Service{
    }
    
    if err := r.client.Get(ctx, serviceSlug, service); err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    objList, err := lister.

    NewVirtualServiceBuilder(r.client, serviceSlug).Build(ctx
    )
    
    if err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    ref := refresh.New(r.client, r.scheme
    )
    
    if err := ref.Refresh(ctx, service, objList); err != nil
    {
    
    return errors.WithStack(err
    )
    
    }
    
    return ni
    l
    
    }
    VirtualServiceUpdater
    ͋Δ service ʹඥͮ͘
    

    virtualService Λ࡞੒͢Δ
    

    Updater
    VirtualServiceBuilder
    VirtualServiceʹ͍ͭͯɺ
    

    ཧ૝తͳঢ়ଶΛ࡞Δ Builder
    Refresher
    ϦιʔεͷϦετΛड͚औΓ
    

    Ϋϥελͷঢ়ଶΛ߹ΘͤΔ
    

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    ಈ࡞֬ೝͱςετͷॻ͖ํ
    32
    

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    ςετͷ໨త
    ςετͰ͔֬Ί͍ͨ͜ͱ͸ʁ
    ద੾ͳKubernetesͷObject͕࡞੒͞ΕΔ͔Ͳ͏͔
    
    
    • Builder
    
    
    • ͋ΔϦιʔε͕ଘࡏ͍ͯ͠Δͱ͖ʹɺద੾ͳϦιʔε͕࡞੒͞ΕΔ͔͔֬Ί͍ͨ
    
    
    • Refresher
    
    
    • ͋ΔϦιʔε͕ଘࡏ͍ͯ͠Δͱ͖ʹɺड͚औͬͨϦιʔεͰΫϥελͷঢ়ଶΛมߋ͍ͨ͠
    
    
    • มߋ͞ΕͨΫϥελͷঢ়ଶ͕ཧ૝తͰ͋Δ͔͔֬Ί͍ͨ
    
    
    33
    

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    4OBQTIPUςετ
    $VQBMPZΛ࢖ͬͨTOBQTIPUςετ
    • Kubernetes ͷ Object List ͷ snapshot ΛࡱΓɺ yaml ͱͯ͠อଘ͢Δ
    
    
    • Yaml ͷࠩ෼͸ github ্Ͱ΋มߋ͕Θ͔Γ΍͍͢ͷͰɺReview΋͠΍͍͢
    
    
    Controller ʹมߋΛՃ͑Δͱ͖
    
    
    1. ݱঢ়ͷڍಈΛอଘ͢Δ
    
    
    2. มߋΛՃ͑ɺεφοϓγϣοτΛߋ৽͢Δ
    
    
    • ૝ఆ͍ͯ͠ΔڍಈΛ͍ͯ͠Δ͔Ͳ͏͔Λ͔֬ΊΔ
    https://github.com/bradleyjkemp/cupaloy 34
    

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    4OBQTIPUςετ
    $VQBMPZΛ࢖ͬͨTOBQTIPUςετ
    • Kubernetes ͷ Object List ͷ snapshot ΛࡱΓɺ yaml ͱͯ͠อଘ͢Δ
    
    
    • Yaml ͷࠩ෼͸ github ্Ͱ΋มߋ͕Θ͔Γ΍͍͢ͷͰɺReview΋͠΍͍͢
    
    
    Controller ʹมߋΛՃ͑Δͱ͖
    
    
    1. ςετ͕ͳ͚Ε͹௥Ճ
    
    
    • ݱঢ়ͷڍಈΛอଘ͓ͯ͘͠
    
    
    2. มߋΛՃ͑ɺςετ͢Δ
    
    
    • ૝ఆ͍ͯ͠ΔڍಈΛ͍ͯ͠Δ͔Ͳ͏͔Λ͔֬ΊΔ
    https://github.com/bradleyjkemp/cupaloy 35
    

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    6QEBUFSʹ͓͚Δ4OBQTIPUςετͷྫ
    36
    t.Run(testcase.name, func(t *testing.T)
    {
    
    existingResources := testcase.initialStat
    e
    
    clnt := fake.NewFakeClientWithScheme(scheme, existingResources...
    )
    
    up := updater.NewVirtualServiceUpdater(clnt, ctrl.Log, scheme
    )
    
    ctx := context.Background(
    )
    
    err := up.UpdateAll(ctx, &client.ListOptions{Namespace: "some-namespace"}
    )
    
    if err != nil
    {
    
    t.Fatal(err
    )
    
    }
    
    vsl := &istio.VirtualServiceList{
    }
    
    err = clnt.List(ctx, vsl, &client.ListOptions{Namespace: "some-namespace"}
    )
    
    if err != nil
    {
    
    t.Fatal(err
    )
    
    }
    
    ut.SnapshotYaml(t, vsl
    )
    
    })
    

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    6QEBUFSʹ͓͚Δ4OBQTIPUςετͷྫ
    37
    t.Run(tc.name, func(t *testing.T)
    {
    
    existingResources := tc.initialStat
    e
    
    clnt := fake.NewFakeClientWithScheme(scheme, existingResources...
    )
    
    up := updater.NewVirtualServiceUpdater(clnt, ctrl.Log, scheme
    )
    
    ctx := context.Background(
    )
    
    err := up.UpdateAll(ctx, &client.ListOptions{Namespace: "some-namespace"}
    )
    
    if err != nil
    {
    
    t.Fatal(err
    )
    
    }
    
    vsl := &istio.VirtualServiceList{
    }
    
    err = clnt.List(ctx, vsl, &client.ListOptions{Namespace: "some-namespace"}
    )
    
    if err != nil
    {
    
    t.Fatal(err
    )
    
    }
    
    ut.SnapshotYaml(t, vsl
    )
    
    }
    )
    
    ςετͷͨΊͷઃఆ
    

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    6QEBUFSʹ͓͚Δ4OBQTIPUςετͷྫ
    38
    t.Run(tc.name, func(t *testing.T)
    {
    
    existingResources := tc.initialStat
    e
    
    clnt := fake.NewFakeClientWithScheme(scheme, existingResources...
    )
    
    up := updater.NewVirtualServiceUpdater(clnt, ctrl.Log, scheme
    )
    
    ctx := context.Background()
    err := up.UpdateAll(ctx, &client.ListOptions{Namespace: "some-namespace"}
    )
    
    if err != nil
    {
    
    t.Fatal(err
    )
    
    }
    
    vsl := &istio.VirtualServiceList{
    }
    
    err = clnt.List(ctx, vsl, &client.ListOptions{Namespace: "some-namespace"}
    )
    
    if err != nil
    {
    
    t.Fatal(err
    )
    
    }
    
    ut.SnapshotYaml(t, vsl
    )
    
    }
    )
    
    ςετͷͨΊͷઃఆ
    ؔ਺Λ࣮ߦ
    

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    6QEBUFSʹ͓͚Δ4OBQTIPUςετͷྫ
    39
    t.Run(tc.name, func(t *testing.T)
    {
    
    existingResources := tc.initialStat
    e
    
    clnt := fake.NewFakeClientWithScheme(scheme, existingResources...
    )
    
    up := updater.NewVirtualServiceUpdater(clnt, ctrl.Log, scheme
    )
    
    ctx := context.Background(
    )
    
    err := up.UpdateAll(ctx, &client.ListOptions{Namespace: "some-namespace"}
    )
    
    if err != nil
    {
    
    t.Fatal(err
    )
    
    }
    
    vsl := &istio.VirtualServiceList{
    }
    
    err = clnt.List(ctx, vsl, &client.ListOptions{Namespace: "some-namespace"}
    )
    
    if err != nil
    {
    
    t.Fatal(err
    )
    
    }
    
    ut.SnapshotYaml(t, vsl
    )
    
    }
    )
    
    ςετͷͨΊͷઃఆ
    ؔ਺Λ࣮ߦ
    ݁ՌΛऔಘ
    

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    6QEBUFSʹ͓͚Δ4OBQTIPUςετͷྫ
    40
    t.Run(tc.name, func(t *testing.T)
    {
    
    existingResources := tc.initialStat
    e
    
    clnt := fake.NewFakeClientWithScheme(scheme, existingResources...
    )
    
    up := updater.NewVirtualServiceUpdater(clnt, ctrl.Log, scheme
    )
    
    ctx := context.Background(
    )
    
    err := up.UpdateAll(ctx, &client.ListOptions{Namespace: "some-namespace"}
    )
    
    if err != nil
    {
    
    t.Fatal(err
    )
    
    }
    
    vsl := &istio.VirtualServiceList{
    }
    
    err = clnt.List(ctx, vsl, &client.ListOptions{Namespace: "some-namespace"}
    )
    
    if err != nil
    {
    
    t.Fatal(err
    )
    
    }
    
    ut.SnapshotYaml(t, vsl) // make objectList to string and take snapsho
    t
    
    }
    )
    
    ςετͷͨΊͷઃఆ
    ؔ਺Λ࣮ߦ
    ݁ՌΛऔಘ
    औಘͨ݁͠ՌΛอଘ
    

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    4OBQTIPUςετͷϝϦοτɾσϝϦοτ
    ˓ؾܰʹςετ͕Ͱ͖Δ
    มߋ͢ΔՕॴͷϦετΛऔಘͯ͠อଘ͢Δ͚ͩ
    

    ·ͨɺऔಘͷॲཧ΋͕͔͔࣌ؒΒͳ͍ͷͰಋೖ͸͠΍͍͢
    ✕4OBQTIPU͕େྔʹอଘ͞ΕΔ
    ໢ཏతʹ͢Δͱsnapshot ͕େྔʹͳͬͯ PR ͕ٯʹݟͮΒ͘ͳΔ
    

    ૝ఆ֎ͷͱ͜Ζʹ diff ͕ग़Δͱ൑ఆ͕೉͘͠ͳΔ
    ˓ͲΜͲΜ࣮૷͍͚ͯ͠Δ
    ؾܰʹςετ͕Ͱ͖ΔͷͰͲΜͲΜ࣮૷͍ͯ͘͠ϑΣʔζʹ޲͍͍ͯΔ
    
    
    ࢓༷͕มΘͬͨͱ͖ʹ snapshot ʹࠩ෼͕ͰΔͷͰΘ͔Γ΍͍͢
    41
    

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    42
    Kubernetes ͔ΒֶΜͩ Go ͷઃܭ࿦
    ෳࡶͳ໰୊͸؆୯ͳ໰୊ʹ੾Γग़ͦ͏
    Custom Controller Λ࡞Δ্Ͱ௚໘͕ͪ͠ͳ໰୊ͱͦͷղܾ
    ΄͍͠Ϧιʔεͷ࡞੒ͱΫϥελͷঢ়ଶͷߋ৽ΛΘ͚Δͱ͏·͍͘͘
    ద੾ͳ package ෼͚͸΍͸Γେࣄ
    Wantedly Ͱ͸ Go ΋࢖ΘΕ͍ͯ·͢
    ϓϩμΫγϣϯͷΞϓϦέʔγϣϯ͔Βɺࣾ಺πʔϧ·Ͱ
    ·ͱΊ
    ॲཧΛ࠶ར༻Ͱ͖Δ͘͠ΈΛͭ͘Ζ͏
    

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