From 038f502da0026f7e4d3ab30fd4b1a08dea10e330 Mon Sep 17 00:00:00 2001
From: Cara Wang <cara@maicoin.com>
Date: Fri, 17 Feb 2023 17:21:38 +0800
Subject: [PATCH] graphql: can parse error from graphql server

---
 graphql.go           | 10 ++++++----
 graphql_json_test.go |  6 +++++-
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/graphql.go b/graphql.go
index f98b674..c19ca29 100644
--- a/graphql.go
+++ b/graphql.go
@@ -311,17 +311,19 @@ func ImmediatelyCloseReqBody() ClientOption {
 // modify the behaviour of the Client.
 type ClientOption func(*Client)
 
-type graphErr struct {
-	Message string
+type GraphQLErr struct {
+	Message    string                 `json:"message"`
+	Path       []interface{}          `json:"path,omitempty"`
+	Extensions map[string]interface{} `json:"extensions,omitempty"`
 }
 
-func (e graphErr) Error() string {
+func (e GraphQLErr) Error() string {
 	return "graphql: " + e.Message
 }
 
 type graphResponse struct {
 	Data   interface{}
-	Errors []graphErr
+	Errors []GraphQLErr
 }
 
 // Request is a GraphQL request.
diff --git a/graphql_json_test.go b/graphql_json_test.go
index a973d2d..515c012 100644
--- a/graphql_json_test.go
+++ b/graphql_json_test.go
@@ -78,7 +78,9 @@ func TestDoJSONBadRequestErr(t *testing.T) {
 		w.WriteHeader(http.StatusBadRequest)
 		io.WriteString(w, `{
 			"errors": [{
-				"message": "miscellaneous message as to why the the request was bad"
+				"message": "miscellaneous message as to why the the request was bad",
+				"path": ["location"],
+				"extensions": {"code": "BAD_USER_INPUT", "subCode": 1063}
 			}]
 		}`)
 	}))
@@ -93,6 +95,8 @@ func TestDoJSONBadRequestErr(t *testing.T) {
 	err := client.Run(ctx, &Request{q: "query {}"}, &responseData)
 	is.Equal(calls, 1) // calls
 	is.Equal(err.Error(), "graphql: miscellaneous message as to why the the request was bad")
+	is.Equal(err.(GraphQLErr).Path[0], "location")
+	is.Equal(err.(GraphQLErr).Extensions["code"], "BAD_USER_INPUT")
 }
 
 func TestQueryJSON(t *testing.T) {