2019 DevDay Go-Ing GraphQL in LINE SPOT - API Gateway for Microservices > Chih-Chiang Tsai (Denny) > LINE Taiwan UIT Software Engineer

Agenda > About Me > API Gateway & GraphQL > The State of GraphQL x Go

About Me Role Front-End Team LINE SPOT From LINE Taiwan

LINE SPOT Location-Based Points of Interests and Services >date/november 20-21 >place/grand nikko tokyo

API Gateway

Clients to Microservices

Clients to API Gateway

GraphQL

What is GraphQL Single Endpoint (HTTP) Typed Schema Transport Agnostic Consumer Centric Data Graph

GitHub API v3 (REST API) GraphQL vs REST Add your text here Whatever it is you want to message your friend, you will find the sticker that expresses your feelings best, like nothing else available in the market. Add your text here Whatever it is you want to message your friend, you will find the sticker that expresses your feelings best, like nothing else available in the market. https://api.github.com/repos/golang/go/issues [ { "url": "https://api.github.com/repos/golang/go/issues/31459", "number": 31459, "title": "cmd/link: Apple's symbols tool unable to read DWARF data from c-archive go.o", "user": { "login": "tmm1", "avatar_url": "https://avatars2.githubusercontent.com/u/2567?v=4", }, "state": "open" }, { "url": "https://api.github.com/repos/golang/go/issues/31458", "number": 31458, "title": "cmd/go: mod meta tag causes infinite loop in GOPROXY", "user": { "login": "marwan-at-work", "avatar_url": "https://avatars0.githubusercontent.com/u/16294261?v=4", },

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GraphQL x Go

Development Approaches Schema First Code First

Go GraphQL Libraries github.com/graphql-go/graphql code first github.com/99designs/gqlgen schema + codegen github.com/graph-gophers/graphql-go schema first

Go GraphQL Libraries github.com/graphql-go/graphql code first github.com/99designs/gqlgen schema + codegen github.com/graph-gophers/graphql-go schema first

Define Schema with SDL Create a schema type Query { posts: [Post] post(id: Int!): Post } type Post { id: Int! title: String! body: String! }

Generated Resolver Interface Resolver Interface type QueryResolver interface { Posts(ctx context.Context) ([]*Post, error) Post(ctx context.Context, id int) (*Post, error) }

Implement Resolvers Resolvers type Resolver struct{} func (r *Resolver) Query() QueryResolver { return &queryResolver{r} } type queryResolver struct{ *Resolver } func (r *queryResolver) Posts(ctx context.Context) ([]*Post, error) { panic("not implemented") } func (r *queryResolver) Post(ctx context.Context, id int) (*Post, error) { panic("not implemented") }

Generated Models Generated models type Post struct { ID int `json:"id"` Title string `json:"title"` Body string `json:"body"` }

Create a Server c := Config{ Resolvers: &Resolver{} } http.Handle("/graphql", handler.GraphQL(NewExecutableSchema(c))

Thanks!