gqlgen golang graphql server 基本试用
gqlgen golang 的graphql server
特点
- 模型优先
- 类型安全
- 代码生成
安装
go get -u /vektah/gqlgen
创建schema
schema.graphql
type Todo {
id: ID!
text: String!
done: Boolean!
user: User!
}
type User {
id: ID!
name: String!
}
type Query {
todos: [Todo!]!
}
input NewTodo {
text: String!
userId: String!
}
type Mutation {
createTodo(input: NewTodo!): Todo!
}
创建model
- User (model/user.go)
package model
// User user info
type User struct {
ID string
Name string
}
- Todo (model/todo.go)
package model
// Todo todo ino
type Todo struct {
ID string
Text string
Done bool
UserID string
}
生成graphql 运行时代码
- 配置模型关联
gqlgen.yml
schema: schema.graphql
exec:
filename: graph/generated.go
model:
filename: model/generated.go
models:
Todo:
model: /rongfengliang/gqlgen-app/model.Todo
User:
model: /rongfengliang/gqlgen-app/model.User
- 生成bingings
gqlgen
- 编写 resolver
graph/graph.go
package graph
import (
"context"
"fmt"
"math/rand"
model "/rongfengliang/gqlgen-app/model"
)
type App struct {
todos []model.Todo
}
func (a *App) Mutation() MutationResolver {
return &mutationResolver{a}
}
func (a *App) Query() QueryResolver {
return &queryResolver{a}
}
func (a *App) Todo() TodoResolver {
return &todoResolver{a}
}
type queryResolver struct{ *App }
func (a *queryResolver) Todos(ctx context.Context) ([]model.Todo, error) {
return a.todos, nil
}
type mutationResolver struct{ *App }
func (a *mutationResolver) CreateTodo(ctx context.Context, input model.NewTodo) (model.Todo, error) {
todo := model.Todo{
Text: input.Text,
ID: fmt.Sprintf("T%d", rand.Int()),
UserID: input.UserId,
}
a.todos = append(a.todos, todo)
return todo, nil
}
type todoResolver struct{ *App }
func (a *todoResolver) User(ctx context.Context, it *model.Todo) (model.User, error) {
return model.User{ID: it.UserID, Name: "user " + it.UserID}, nil
}
入口代码编写
- main.go
package main
import (
"fmt"
"log"
"net/http"
"/rongfengliang/gqlgen-app/graph"
"/vektah/gqlgen/handler"
)
func main() {
http.Handle("/", handler.Playground("Todo", "/query"))
http.Handle("/query", handler.GraphQL(graph.NewExecutableSchema(&graph.App{})))
fmt.Println("Listening on :8080")
log.Fatal(http.ListenAndServe(":8080", nil))
}
运行
go run main.go
效果
集成dep
dep init
