Update watch.py

Changes made in unmarshal_event for not having issues with empty lines.

Author: p172913

kubernetes/base/watch/watch.py

@@ -82,7 +82,7 @@ def iter_resp_lines(resp):
                 last_was_empty = False  # Reset empty-line flag
             else:
                 if not last_was_empty:
-                    yield '\n'  # Only print one empty line
+                    yield ''  # Only print one empty line
                 last_was_empty = True  # Mark that we handled an empty line
             next_newline = buffer.find(b'\n')
 
@@ -113,24 +113,29 @@ def get_watch_argument_name(self, func):
             return 'watch'
 
     def unmarshal_event(self, data, return_type):
-        js = json.loads(data)
-        js['raw_object'] = js['object']
-        # BOOKMARK event is treated the same as ERROR for a quick fix of
-        # decoding exception
-        # TODO: make use of the resource_version in BOOKMARK event for more
-        # efficient WATCH
-        if return_type and js['type'] != 'ERROR' and js['type'] != 'BOOKMARK':
-            obj = SimpleNamespace(data=json.dumps(js['raw_object']))
-            js['object'] = self._api_client.deserialize(obj, return_type)
-            if hasattr(js['object'], 'metadata'):
-                self.resource_version = js['object'].metadata.resource_version
-            # For custom objects that we don't have model defined, json
-            # deserialization results in dictionary
-            elif (isinstance(js['object'], dict) and 'metadata' in js['object']
-                  and 'resourceVersion' in js['object']['metadata']):
-                self.resource_version = js['object']['metadata'][
-                    'resourceVersion']
-        return js
+        if not data or data.isspace():
+            return None
+        try:
+            js = json.loads(data)
+            js['raw_object'] = js['object']
+            # BOOKMARK event is treated the same as ERROR for a quick fix of
+            # decoding exception
+            # TODO: make use of the resource_version in BOOKMARK event for more
+            # efficient WATCH
+            if return_type and js['type'] != 'ERROR' and js['type'] != 'BOOKMARK':
+                obj = SimpleNamespace(data=json.dumps(js['raw_object']))
+                js['object'] = self._api_client.deserialize(obj, return_type)
+                if hasattr(js['object'], 'metadata'):
+                    self.resource_version = js['object'].metadata.resource_version
+                # For custom objects that we don't have model defined, json
+                # deserialization results in dictionary
+                elif (isinstance(js['object'], dict) and 'metadata' in js['object']
+                      and 'resourceVersion' in js['object']['metadata']):
+                    self.resource_version = js['object']['metadata'][
+                        'resourceVersion']
+            return js
+        except json.JSONDecodeError:
+            return None
 
     def stream(self, func, *args, **kwargs):
         """Watch an API resource and stream the result back via a generator.
@@ -209,7 +214,7 @@ def stream(self, func, *args, **kwargs):
                             yield line  # Normal non-empty line
                             last_was_empty = False  
                         elif not last_was_empty:  
-                            yield '/n'  # Only yield one empty line  
+                            yield ''  # Only yield one empty line  
                             last_was_empty = True
                     if self._stop:
                         break