graphql

demo/main.go

@@ -0,0 +1,94 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"runtime"
+
+	"github.com/graphql-go/graphql"
+)
+
+func main() {
+	runtime.GOMAXPROCS(runtime.NumCPU())
+
+	// Schema
+	fields := graphql.Fields{
+		"hello": &graphql.Field{
+			Type: graphql.String,
+			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+				return "world", nil
+			},
+		},
+		"users": &graphql.Field{
+			Type: graphql.NewList(graphql.NewObject(graphql.ObjectConfig{
+				Name: "User",
+				Fields: graphql.Fields{
+					"id": &graphql.Field{
+						Type: graphql.Int,
+					},
+					"name": &graphql.Field{
+						Type: graphql.String,
+					},
+					"age": &graphql.Field{
+						Type: graphql.Int,
+					},
+					"info": &graphql.Field{
+						Type: graphql.String,
+					},
+					"price": &graphql.Field{
+						Type: graphql.Float,
+					},
+				},
+			})),
+			Args: graphql.FieldConfigArgument{
+				"id": &graphql.ArgumentConfig{
+					Type: graphql.Int,
+				},
+			},
+			Resolve: func(p graphql.ResolveParams) (interface{}, error) {
+				fmt.Println("p.Args:", p.Args)
+				return []interface{}{
+					map[string]interface{}{
+						"id":    1,
+						"name":  "user1",
+						"age":   10,
+						"info":  "info",
+						"price": 1.1,
+					},
+					map[string]interface{}{
+						"id":    2,
+						"name":  "user2",
+						"age":   20,
+						"info":  "info",
+						"price": 2.2,
+					},
+				}, 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)
+	}
+
+	http.HandleFunc("/graphql", func(w http.ResponseWriter, r *http.Request) {
+		query := r.URL.Query().Get("query")
+		fmt.Println("query:", query)
+		params := graphql.Params{Schema: schema, RequestString: query}
+		result := graphql.Do(params)
+		if len(result.Errors) > 0 {
+			fmt.Printf("failed to execute graphql operation, errors: %+v", result.Errors)
+			http.Error(w, result.Errors[0].Error(), 500)
+			return
+		}
+		rJSON, _ := json.Marshal(result)
+		fmt.Printf("%s \n", rJSON) // {"data":{"hello":"world"}}
+		w.Write(rJSON)
+	})
+
+	http.ListenAndServe(":8080", nil)
+}