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// graphqldev is a test program currently being used for developing graphql package.
// It performs queries against a local test GraphQL server instance.
//
// It's not meant to be a clean or readable example. But it's functional.
// Better, actual examples will be created in the future.
package main
import (
"context"
"encoding/json"
"flag"
"log"
"net/http"
"net/http/httptest"
"os"
graphqlserver "github.com/graph-gophers/graphql-go"
"github.com/graph-gophers/graphql-go/example/starwars"
"github.com/graph-gophers/graphql-go/relay"
"github.com/shurcooL/graphql"
)
func main() {
flag.Parse()
err := run()
if err != nil {
log.Println(err)
}
}
func run() error {
// Set up a GraphQL server.
schema, err := graphqlserver.ParseSchema(starwars.Schema, &starwars.Resolver{})
if err != nil {
return err
}
mux := http.NewServeMux()
mux.Handle("/query", &relay.Handler{Schema: schema})
client := graphql.NewClient("/query", &http.Client{Transport: localRoundTripper{handler: mux}})
/*
query {
hero {
id
name
}
character(id: "1003") {
name
friends {
name
__typename
}
appearsIn
}
}
*/
var q struct {
Hero struct {
ID graphql.ID
Name graphql.String
}
Character struct {
Name graphql.String
Friends []struct {
Name graphql.String
Typename graphql.String `graphql:"__typename"`
}
AppearsIn []graphql.String
} `graphql:"character(id: $characterID)"`
}
variables := map[string]interface{}{
"characterID": graphql.ID("1003"),
}
err = client.Query(context.Background(), &q, variables)
if err != nil {
return err
}
print(q)
return nil
}
// print pretty prints v to stdout. It panics on any error.
func print(v interface{}) {
w := json.NewEncoder(os.Stdout)
w.SetIndent("", "\t")
err := w.Encode(v)
if err != nil {
panic(err)
}
}
// localRoundTripper is an http.RoundTripper that executes HTTP transactions
// by using handler directly, instead of going over an HTTP connection.
type localRoundTripper struct {
handler http.Handler
}
func (l localRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
w := httptest.NewRecorder()
l.handler.ServeHTTP(w, req)
return w.Result(), nil
}
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