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

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KAUCHE Platform Team: Architect Yuki Ito @mrno110

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

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

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

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

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

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

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

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

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

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

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

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

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

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Architecture: 2020 ~ Run Customer App Customer gRPC

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

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

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

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

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