KAUCHE Loves Go

Transcript

1. KAUCHE ❤ Go
   Yuki Ito (@mrno110)
   KAUCHE Tech Talk #3
   

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2. KAUCHE
   
   
   Platform Team: Architect
   Yuki Ito
   
   
   @mrno110
   

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3. https://gihyo.jp/book/2022/978-4-297-12519-6
   

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5. Agenda
   • Why Go?
   
   
   • Go at KAUCHE
   
   
   • Code Generation
   
   
   • Clean Architecture
   
   
   • From Modular Monolith
   
   
   To Microservice
   

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6. Agenda
   • Why Go?
   
   
   • Go at KAUCHE
   
   
   • Code Generation
   
   
   • Clean Architecture
   
   
   • From Modular Monolith
   
   
   To Microservice
   

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7. Why Go?
   • Simplicity
   
   
   • Ecosystem
   
   
   • e.g. gRPC, google-cloud-go etc...
   
   
   • Used by Many Cloud Native Softwares
   
   
   • e.g. Kubernetes, Istio etc...
   
   
   • Goroutines & Channel
   

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8. Agenda
   • Why Go?
   
   
   • Go at KAUCHE
   
   
   • Code Generation
   
   
   • Clean Architecture
   
   
   • From Modular Monolith
   
   
   To Microservice
   

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9. Architecture
   Run
   Tasks
   Pub/Sub
   Mobile App External Service
   Mobile API Web Hook API Job API
   Scheduler
   

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10. https://cloud.withgoogle.com/next/speakers?session=HIVE101-JP
    

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11. Code Generation - gRPC
    gRPC is a modern open source
    high performance Remote
    Procedure Call (RPC)
    framework that can run in
    any environment.
    https://grpc.io/
    

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12. Code Generation - gRPC
    rpc GetProduct(GetProductRequest) returns (GetProductResponse) {
    
    
    option (google.api.http) = {
    
    
    get: "/..."
    
    
    };
    
    
    }
    type CustomerServiceServer interface {
    
    
    GetProduct(context.Context, *GetProductRequest) (*GetProductResponse, error)
    
    
    // ...
    
    
    }
    Generate (protoc)
    Protocol Bu
    ff
    ers
    Go
    

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13. Code Generation - GraphQL
    GraphQL is a query language
    for APIs and a runtime for
    ful
    fi
    lling those queries with
    your existing data.
    https://graphql.org/
    

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14. Code Generation - GraphQL
    GraphQL Schema
    Generate (gqlgen)
    type QueryResolver interface {
    
    
    Products(ctx context.Context) ([]*Product, error)
    
    
    // ...
    
    
    }
    Go
    

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15. Code Generation - GraphQL
    https://github.com/99designs/gqlgen
    

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16. Code Generation - Database
    Fully managed relational
    database with unlimited
    scale, strong consistency, and
    up to 99.999% availability.
    https://cloud.google.com/spanner
    

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17. Code Generation - Database
    CREATE TABLE Products (
    ProductId STRING(36) NOT NULL,
    -- ...
    ) PRIMARY KEY(ProductId);
    Database Schema
    Generate (yo)
    func FindProduct(ctx context.Context, db YORODB, productID string) (*Product, error) {
    // ...
    }
    Go
    

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18. Code Generation - Database
    cloudspannerecosystem / yo
    https://github.com/cloudspannerecosystem/yo
    

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19. Agenda
    • Why Go?
    
    
    • Go at KAUCHE
    
    
    • Code Generation
    
    
    • Clean Architecture
    
    
    • From Modular Monolith
    
    
    To Microservice
    

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20. Clean Architecture
    https://blog.cleancoder.com/uncle-bob/2012/08/13/the-clean-architecture.html
    

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21. Clean Architecture
    • Entities
    
    
    • Business Objects
    
    
    • Use Cases
    
    
    • Application Business Rules
    
    
    • Drivers
    
    
    • gRPC
    
    
    • Cloud Spanner
    
    
    • Identity Platform
    
    
    • Event System
    
    
    • ...
    

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22. Agenda
    • Why Go?
    
    
    • Go at KAUCHE
    
    
    • Code Generation
    
    
    • Clean Architecture
    
    
    • From Modular Monolith
    
    
    To Microservice
    

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23. Architecture: 2020 ~
    Run
    Customer App
    Customer gRPC
    

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24. Architecture: 2021 ~
    Run
    Customer App
    Customer gRPC / Partner gRPC
    Partner App
    

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25. Modular Monolith
    Almost all the cases where I've heard of a system that was built
    as a microservice system from scratch, it has ended up in serious
    trouble. ...
    
    
    you shouldn't start a new project with microservices, even if
    you're sure your application will be big enough to make it
    worthwhile.
    MonolithFirst
    Martin Fowler
    https://martinfowler.com/bliki/MonolithFirst.html
    

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26. Modular Monolith
    ✅ Pros
    
    
    - Single Deployment Unit
    
    
    - Simple Design
    
    
    ❌ Cons
    
    
    - Independence
    
    
    - Autonomy
    

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27. Architecture: 2022 ~
    Customer App
    Customer gRPC
    Partner App
    Partner gRPC
    API Gateway
    

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28. Architecture: 2022 ~
    Commerce gRPC
    API Gateway
    Social GraphQL
    Customer GraphQL Federation (Apollo Router)
    Commerce GraphQL
    Social gRPC
    Platfrom
    Business
    

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29. Agenda
    • Why Go?
    
    
    • Go at KAUCHE
    
    
    • Code Generation
    
    
    • Clean Architecture
    
    
    • From Modular Monolith
    
    
    To Microservice
    

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