[Feature] Return dictionary and raise GraphQLException on error from GraphQL query

CHANGELOG

@@ -1,5 +1,6 @@
 == Unreleased
 
+- Return dictionary and raise GraphQLException on error from GraphQL query
 - Remove requirement to provide scopes to Permission URL, as it should be omitted if defined with the TOML file.
 
 == Version 12.7.0

shopify/resources/graphql.py

@@ -1,9 +1,17 @@
 import shopify
-from ..base import ShopifyResource
 from six.moves import urllib
 import json
 
 
+class GraphQLException(Exception):
+    def __init__(self, response):
+        self._response = response
+
+    @property
+    def errors(self):
+        return self._response['errors']
+
+
 class GraphQL:
     def __init__(self):
         self.endpoint = shopify.ShopifyResource.get_site() + "/graphql.json"
@@ -16,7 +24,6 @@ def merge_headers(self, *headers):
         return merged_headers
 
     def execute(self, query, variables=None, operation_name=None):
-        endpoint = self.endpoint
         default_headers = {"Accept": "application/json", "Content-Type": "application/json"}
         headers = self.merge_headers(default_headers, self.headers)
         data = {"query": query, "variables": variables, "operationName": operation_name}
@@ -25,8 +32,9 @@ def execute(self, query, variables=None, operation_name=None):
 
         try:
             response = urllib.request.urlopen(req)
-            return response.read().decode("utf-8")
+            result = json.loads(response.read().decode("utf-8"))
+            if result.get('errors'):
+                raise GraphQLException(result)
+            return result
         except urllib.error.HTTPError as e:
-            print((e.read()))
-            print("")
-            raise e
+            raise GraphQLException(json.load(e.fp))

test/graphql_test.py

@@ -1,5 +1,4 @@
 import shopify
-import json
 from test.test_helper import TestCase
 
 
@@ -31,7 +30,7 @@ def test_fetch_shop_with_graphql(self):
             }
         """
         result = self.client.execute(query)
-        self.assertTrue(json.loads(result)["shop"]["name"] == "Apple Computers")
+        self.assertTrue(result["shop"]["name"] == "Apple Computers")
 
     def test_specify_operation_name(self):
         query = """
@@ -43,4 +42,4 @@ def test_specify_operation_name(self):
             }
         """
         result = self.client.execute(query, operation_name="GetShop")
-        self.assertTrue(json.loads(result)["shop"]["name"] == "Apple Computers")
+        self.assertTrue(result["shop"]["name"] == "Apple Computers")