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Graphql Go 基于Golang实践

GraphQL 既是一种用于 API 的查询语言也是一个满足你数据查询的运行时。 GraphQL 对你的 API 中的数据提供了一套易于理解的完整描述,使得客户端能够准确地获得它需要的数据,而且没有任何冗余,也让 API 更容易地随着时间推移而演进,还能用于构建强大的开发者工具。

GraphQL技术在 NodeJS 的服务端中常常会使用,而 Golang 作为高性能的现代语言在 web 服务器开发中也有很高的使用率,特别是在云原生的构建上。

根据 GraphQL 中文官网代码 中找到graphql-go:一个 Go/Golang 的 GraphQL 实现。

这个库还封装 graphql-go-handler:通过HTTP请求处理GraphQL查询的中间件。

package main

import (
	"encoding/json"
	"fmt"
	"log"

	"github.com/graphql-go/graphql"
)

func main() {
	// Schema
	fields := graphql.Fields{
		"hello": &graphql.Field{
			Type: graphql.String,
			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
				return "world", nil
			},
		},
	}
	rootQuery := graphql.ObjectConfig{Name: "RootQuery", Fields: fields}
	schemaConfig := graphql.SchemaConfig{Query: graphql.NewObject(rootQuery)}
	schema, err := graphql.NewSchema(schemaConfig)
	if err != nil {
		log.Fatalf("failed to create new schema, error: %v", err)
	}

	// Query
	query := `
		{
			hello
		}
	`
	params := graphql.Params{Schema: schema, RequestString: query}
	r := graphql.Do(params)
	if len(r.Errors) > 0 {
		log.Fatalf("failed to execute graphql operation, errors: %+v", r.Errors)
	}
	rJSON, _ := json.Marshal(r)
	fmt.Printf("%s \n", rJSON) // {“data”:{“hello”:”world”}}
}

最后

通过graphql-go这个库实现GraphQl查询,使用typeinputenum的参数方式,实现CRUD操作。微服务采用restfulgraphql两种方式进行开发,两者相辅相成,比如:上传、websocket等一些接口混用的模式。

示例环境 go:1.13,编辑器vscode
项目下命令执行:go run main.go
GraphQL 官网实现 graphql-js 这个的库,使用 typescript强类型代码编写。
如果不会语法,建议先看看 graphql-js 基础SDL文件编写。

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