wire auth to example, fix wire format, it's aliiiiiive!

example/caller.go

@@ -3,17 +3,48 @@ package example
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"os"
 
 	"github.com/Khan/genql/graphql"
 )
 
-func Main() {
-	client := graphql.NewClient("https://api.github.com/graphql", nil)
-	resp, err := getViewer(context.Background(), client)
-	if err != nil {
-		fmt.Println(err)
-		os.Exit(1)
-	}
-	fmt.Println("you are:", resp.Viewer.Name)
+type authedTransport struct {
+	key     string
+	wrapped http.RoundTripper
+}
+
+func (t *authedTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	req.Header.Set("Authorization", "bearer "+t.key)
+	return t.wrapped.RoundTrip(req)
+}
+
+func Main() {
+	var err error
+	defer func() {
+		if err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+	}()
+
+	key := os.Getenv("KEY")
+	if key == "" {
+		err = fmt.Errorf("must set KEY=<github token>")
+		return
+	}
+
+	httpClient := http.Client{
+		Transport: &authedTransport{
+			key:     key,
+			wrapped: http.DefaultTransport,
+		},
+	}
+	graphqlClient := graphql.NewClient("https://api.github.com/graphql", &httpClient)
+	resp, err := getViewer(context.Background(), graphqlClient)
+	if err != nil {
+		return
+	}
+
+	fmt.Println("you are:", *resp.Viewer.Name)
 }

graphql/client.go

@@ -1,12 +1,12 @@
 package graphql
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
 	"net/http"
-	"strings"
 
 	"github.com/vektah/gqlparser/gqlerror"
 )
@@ -24,11 +24,24 @@ func NewClient(endpoint string, httpClient *http.Client) *Client {
 	return &Client{endpoint, http.MethodPost, httpClient}
 }
 
+type payload struct {
+	Query     string            `json:"query"`
+	Variables map[string]string `json:"variables"`
+}
+
 func (client *Client) MakeRequest(ctx context.Context, query string, retval interface{}) error {
+	body, err := json.Marshal(payload{
+		Query:     query,
+		Variables: nil, // TODO
+	})
+	if err != nil {
+		return err
+	}
+
 	req, err := http.NewRequest(
 		client.method,
 		client.endpoint,
-		strings.NewReader(query))
+		bytes.NewReader(body))
 	if err != nil {
 		return err
 	}
@@ -40,7 +53,7 @@ func (client *Client) MakeRequest(ctx context.Context, query string, retval inte
 	}
 	defer resp.Body.Close()
 
-	body, err := ioutil.ReadAll(resp.Body)
+	body, err = ioutil.ReadAll(resp.Body)
 	if err != nil {
 		return err
 	}