Log response error status code and body (#166)

cfn/response.go

@@ -5,8 +5,9 @@ package cfn
 import (
 	"bytes"
 	"encoding/json"
-	"errors"
+	"fmt"
 	"io/ioutil"
+	"log"
 	"net/http"
 )
 
@@ -73,7 +74,8 @@ func (r *Response) sendWith(client httpClient) error {
 	res.Body.Close()
 
 	if res.StatusCode != 200 {
-		return errors.New("invalid status code")
+		log.Printf("StatusCode: %d\nBody: %v\n", res.StatusCode, string(body))
+		return fmt.Errorf("invalid status code. got: %d", res.StatusCode)
 	}
 
 	return nil

cfn/response_test.go

@@ -4,6 +4,7 @@ package cfn
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"net/http"
 	"testing"
@@ -68,15 +69,19 @@ func TestRequestForbidden(t *testing.T) {
 		url:    "http://pre-signed-S3-url-for-response",
 	}
 
+	sc := http.StatusForbidden
 	client := &mockClient{
 		DoFunc: func(req *http.Request) (*http.Response, error) {
 			assert.NotContains(t, req.Header, "Content-Type")
 			return &http.Response{
-				StatusCode: http.StatusForbidden,
+				StatusCode: sc,
 				Body:       nopCloser{bytes.NewBufferString("")},
 			}, nil
 		},
 	}
 
-	assert.Error(t, r.sendWith(client))
+	s := r.sendWith(client)
+	if assert.Error(t, s) {
+		assert.Equal(t, fmt.Errorf("invalid status code. got: %d", sc), s)
+	}
 }