Context

main.go

package main
import (    "context"    "encoding/json"    "fmt"    "log"    "net/http"
    "github.com/graphql-go/graphql")
var Schema graphql.Schema
var userType = graphql.NewObject(    graphql.ObjectConfig{        Name: "User",        Fields: graphql.Fields{            "id": &graphql.Field{                Type: graphql.String,            },            "name": &graphql.Field{                Type: graphql.String,            },        },    },)
var queryType = graphql.NewObject(    graphql.ObjectConfig{        Name: "Query",        Fields: graphql.Fields{            "me": &graphql.Field{                Type: userType,                Resolve: func(p graphql.ResolveParams) (interface{}, error) {                    return p.Context.Value("currentUser"), nil                },            },        },    })
func graphqlHandler(w http.ResponseWriter, r *http.Request) {    user := struct {        ID   int    `json:"id"`        Name string `json:"name"`    }{1, "cool user"}    result := graphql.Do(graphql.Params{        Schema:        Schema,        RequestString: r.URL.Query().Get("query"),        Context:       context.WithValue(context.Background(), "currentUser", user),    })    if len(result.Errors) > 0 {        log.Printf("wrong result, unexpected errors: %v", result.Errors)        return    }    json.NewEncoder(w).Encode(result)}
func main() {    http.HandleFunc("/graphql", graphqlHandler)    fmt.Println("Now server is running on port 8080")    fmt.Println("Test with Get      : curl -g 'http://localhost:8080/graphql?query={me{id,name}}'")    http.ListenAndServe(":8080", nil)}
func init() {    s, err := graphql.NewSchema(graphql.SchemaConfig{        Query: queryType,    })    if err != nil {        log.Fatalf("failed to create schema, error: %v", err)    }    Schema = s}