Modular Monolith Go Server with GraphQL Federation + gRPC @yuki.ito

newmo Architect Yuki Ito @mrno110

We are Hiring!!!

Agenda ✅ API Architecture ✅ Go Modular Monolith (+ Monorepo)

GraphQL + gRPC

GraphQL + gRPC

Why GraphQL? ✅ Ecosystem ✅ Federation ✅ Declarative

Why GraphQL? ✅ Ecosystem ✅ Federation ✅ Declarative

Evolution of API Architecture (by Netflix) https://netflixtechblog.com/how-netflix-scales-its-api-with-graphql-federation-part-1-ae3557c187e2

Evolution of API Architecture (by Netflix) https://netflixtechblog.com/how-netflix-scales-its-api-with-graphql-federation-part-1-ae3557c187e2

Evolution of API Architecture (by Netflix) https://netflixtechblog.com/how-netflix-scales-its-api-with-graphql-federation-part-1-ae3557c187e2

Evolution of API Architecture (by Netflix) https://netflixtechblog.com/how-netflix-scales-its-api-with-graphql-federation-part-1-ae3557c187e2

GraphQL - Direct Access

GraphQL - Direct Access type Driver { id: ID! name: String! } type Vehicle { id: ID! driverId: String! }

GraphQL - Direct Access ❌ Round Trips ❌ Aggregation Logics reside Web/Mobile side

GraphQL - Aggregation

GraphQL - Aggregation type Driver { id: ID! name: String! vehicles: [Vehicle!]! }

GraphQL - Aggregation ❌ Initiative ❌ Independence ❌ Autonomy

GraphQL - Federation

GraphQL - Federation type Driver @key(fields: "id") { id: ID! name: String! } type Driver @key(fields: "id") { id: ID! vehicles: [Vehicle!]! } type Vehicle { id: ID! } type Driver { id: ID! name: String! vehicles: [Vehicle!]! } +

GraphQL - Federation API Gateway Vehicle GraphQL GraphQL Federation (Apollo Router) Driver GraphQL Platform Business

gqlgen https://gqlgen.com/

gqlgen type Driver @key(fields: "id") { id: ID! name: String! } type QueryResolver interface { Driver(ctx context.Context) (*Driver, error) } type EntityResolver interface { FindDriverByID(ctx context.Context, id string) (*Driver, error) }

Go Components

Go Components

Modular Monolith ... splitting applications into independently deployable microservices is not without its challenges, some of which directly contradict the benefits. Towards Modern Development of Cloud Applications Google (ServiceWeaver) https://dl.acm.org/doi/10.1145/3593856.3595909 ... Write monolithic applications that are modularized into logically distinct components.

Go Modular Monolith Application Component Component Component

Modular Monolith - Application func main() { app.Run(application) } func application(ctx context.Context, a *app.Application) error { a.AddComponent("driver", driver.Component) a.AddComponent("vehicle", passenger.Component) return a.Run(ctx) }

Modular Monolith - Component func Component(ctx context.Context, c *app.Component) error { env := new(environments) err := c.LoadEnvironments(env) db, err := c.GetDatabase(ctx) // ... c.AddGraphQLHandler(/*...*/) c.AddGRPCService(/*...*/) return c.Run(ctx) }

Go Modular Monolith Application Component Component Component HTTP (GraphQL) Server gRPC Server

Architecture

We are Hiring!!!