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> Denny Tsai / UIT, LINE Taiwan Go-ing GraphQL in LINE SPOT API Gateway for Microservices 

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 Service A Service B Service C Service D 

Clients to API Gateway Service A Service B Service C Service D 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 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", 

GitHub API v4 (GraphQL 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. { repository( owner: "golang" name: "go" ) { name issues( first: 2 orderBy: { field: CREATED_AT direction: DESC } ) { totalCount nodes { number title } } } } { "data": { "repository": { "name": "go", "issues": { "totalCount": 30761, "nodes": [ { "number": 31459, "title": "cmd/link: Apple's symbols tool ..." }, { "number": 31458, "title": "cmd/go: mod meta tag causes ..." } ] } } } } 

GraphQL x Go 

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

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") } 

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

Thank You