slow_start: monkey patch class instead of object

Author: funny-falcon

tests/helpers/ptrack_helpers.py

@@ -139,39 +139,41 @@ def __init__(self, message, cmd):
     def __str__(self):
         return '\n ERROR: {0}\n CMD: {1}'.format(repr(self.message), self.cmd)
 
+if not hasattr(testgres.PostgresNode, "slow_start"):
+    # Monkey-Patch testgres.PostgresNode - add slow_start method
+    def slow_start(self, replica=False):
+
+        # wait for https://github.com/postgrespro/testgres/pull/50
+    #    self.start()
+    #    self.poll_query_until(
+    #       "postgres",
+    #       "SELECT not pg_is_in_recovery()",
+    #       suppress={testgres.NodeConnection})
+        if replica:
+            query = 'SELECT pg_is_in_recovery()'
+        else:
+            query = 'SELECT not pg_is_in_recovery()'
 
-def slow_start(self, replica=False):
-
-    # wait for https://github.com/postgrespro/testgres/pull/50
-#    self.start()
-#    self.poll_query_until(
-#       "postgres",
-#       "SELECT not pg_is_in_recovery()",
-#       suppress={testgres.NodeConnection})
-    if replica:
-        query = 'SELECT pg_is_in_recovery()'
-    else:
-        query = 'SELECT not pg_is_in_recovery()'
-
-    self.start()
-    while True:
-        try:
-            output = self.safe_psql('template1', query).decode("utf-8").rstrip()
-
-            if output == 't':
-                break
-
-        except testgres.QueryException as e:
-            if 'database system is starting up' in e.message:
-                pass
-            elif 'FATAL:  the database system is not accepting connections' in e.message:
-                pass
-            elif replica and 'Hot standby mode is disabled' in e.message:
-                raise e
-            else:
-                raise e
+        self.start()
+        while True:
+            try:
+                output = self.safe_psql('template1', query).decode("utf-8").rstrip()
+
+                if output == 't':
+                    break
+
+            except testgres.QueryException as e:
+                if 'database system is starting up' in e.message:
+                    pass
+                elif 'FATAL:  the database system is not accepting connections' in e.message:
+                    pass
+                elif replica and 'Hot standby mode is disabled' in e.message:
+                    raise e
+                else:
+                    raise e
 
-        sleep(0.5)
+            sleep(0.5)
+    testgres.PostgresNode.slow_start = slow_start
 
 
 def is_test_result_ok(test_case):
@@ -419,8 +421,6 @@ def make_empty_node(
         os.makedirs(real_base_dir)
 
         node = testgres.get_new_node('test', base_dir=real_base_dir)
-        # bound method slow_start() to 'node' class instance
-        node.slow_start = slow_start.__get__(node)
         node.should_rm_dirs = True
         return node