Merge pull request #36 from lichen2013/keep_watch

Keep the watch action working forever

watch/watch.py

@@ -63,6 +63,7 @@ class Watch(object):
         self._raw_return_type = return_type
         self._stop = False
         self._api_client = client.ApiClient()
+        self.resource_version = 0
 
     def stop(self):
         self._stop = True
@@ -81,6 +82,8 @@ class Watch(object):
         if return_type:
             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
         return js
 
     def stream(self, func, *args, **kwargs):
@@ -113,12 +116,19 @@ class Watch(object):
         return_type = self.get_return_type(func)
         kwargs['watch'] = True
         kwargs['_preload_content'] = False
-        resp = func(*args, **kwargs)
-        try:
-            for line in iter_resp_lines(resp):
-                yield self.unmarshal_event(line, return_type)
-                if self._stop:
-                    break
-        finally:
-            resp.close()
-            resp.release_conn()
+
+        timeouts = ('timeout_seconds' in kwargs)
+        while True:
+            resp = func(*args, **kwargs)
+            try:
+                for line in iter_resp_lines(resp):
+                    yield self.unmarshal_event(line, return_type)
+                    if self._stop:
+                        break
+            finally:
+                kwargs['resource_version'] = self.resource_version
+                resp.close()
+                resp.release_conn()
+
+            if timeouts or self._stop:
+                break

watch/watch_test.py

@@ -85,6 +85,38 @@ class WatchTests(unittest.TestCase):
             fake_resp.close.assert_called_once()
             fake_resp.release_conn.assert_called_once()
 
+    def test_watch_stream_loop(self):
+        w = Watch(float)
+
+        fake_resp = Mock()
+        fake_resp.close = Mock()
+        fake_resp.release_conn = Mock()
+        fake_resp.read_chunked = Mock(
+            return_value=['{"type": "ADDED", "object": 1}\n'])
+
+        fake_api = Mock()
+        fake_api.get_namespaces = Mock(return_value=fake_resp)
+        fake_api.get_namespaces.__doc__ = ':return: V1NamespaceList'
+
+        count = 0
+
+        # when timeout_seconds is set, auto-exist when timeout reaches
+        for e in w.stream(fake_api.get_namespaces, timeout_seconds=1):
+            count = count + 1
+        self.assertEqual(count, 1)
+
+        # when no timeout_seconds, only exist when w.stop() is called
+        for e in w.stream(fake_api.get_namespaces):
+            count = count + 1
+            if count == 2:
+                w.stop()
+
+        self.assertEqual(count, 2)
+        self.assertEqual(fake_api.get_namespaces.call_count, 2)
+        self.assertEqual(fake_resp.read_chunked.call_count, 2)
+        self.assertEqual(fake_resp.close.call_count, 2)
+        self.assertEqual(fake_resp.release_conn.call_count, 2)
+
     def test_unmarshal_with_float_object(self):
         w = Watch()
         event = w.unmarshal_event('{"type": "ADDED", "object": 1}', 'float')