move a bunch of the logic from generated into client

example/caller.go

@@ -4,10 +4,13 @@ import (
 	"context"
 	"fmt"
 	"os"
+
+	"github.com/Khan/genql/graphql"
 )
 
 func Main() {
-	resp, err := getViewer(context.Background())
+	client := graphql.NewClient("https://api.github.com/graphql", nil)
+	resp, err := getViewer(context.Background(), client)
 	if err != nil {
 		fmt.Println(err)
 		os.Exit(1)

example/generated.go

@@ -2,13 +2,8 @@ package example
 
 import (
 	"context"
-	"encoding/json"
-	"fmt"
-	"io/ioutil"
-	"net/http"
-	"strings"
 
-	"github.com/vektah/gqlparser/gqlerror"
+	"github.com/Khan/genql/graphql"
 )
 
 type getViewerResponse = struct {
@@ -18,49 +13,14 @@ type getViewerResponse = struct {
 }
 
 // TODO
-func getViewer(ctx context.Context) (*getViewerResponse, error) {
-	req, err := http.NewRequest(
-		http.MethodPost,
-		`https://api.github.com/graphql`,
-		strings.NewReader(`
+func getViewer(ctx context.Context, client *graphql.Client) (*getViewerResponse, error) {
+	var retval getViewerResponse
+	err := client.MakeRequest(ctx, `
 query getViewer {
 	Viewer: viewer {
 		Name: name
 	}
 }
-`))
-	if err != nil {
-		return nil, err
-	}
-
-	req = req.WithContext(ctx)
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return nil, err
-	}
-	defer resp.Body.Close()
-
-	body, err := ioutil.ReadAll(resp.Body)
-	if err != nil {
-		return nil, err
-	}
-
-	if resp.StatusCode != http.StatusOK {
-		return nil, fmt.Errorf("returned error %v: %v", resp.Status, string(body))
-	}
-
-	var retval struct {
-		Data   getViewerResponse `json:"data"`
-		Errors gqlerror.List     `json:"errors"`
-	}
-	err = json.Unmarshal(body, &retval)
-	if err != nil {
-		return nil, err
-	}
-
-	if len(retval.Errors) > 0 {
-		return nil, retval.Errors
-	}
-
-	return &retval.Data, nil
+`, &retval)
+	return &retval, err
 }