Catch TypeError within ha loop not in the unit test

In addition to that use sleep function from patroni.utils instead of
time.sleep which is interruptable

patroni/ha.py

@@ -3,13 +3,13 @@ import logging
 import psycopg2
 import requests
 import sys
-import time
 import datetime
 import pytz
 
+from multiprocessing.pool import ThreadPool
 from patroni.async_executor import AsyncExecutor
 from patroni.exceptions import DCSError, PostgresConnectionException
-from multiprocessing.pool import ThreadPool
+from patroni.utils import sleep
 
 logger = logging.getLogger(__name__)
 
@@ -283,20 +283,22 @@ class Ha(object):
             # the value.
             # If the value is close to now, we initiate the failover
             now = datetime.datetime.now(pytz.utc)
-            delta = (failover.scheduled_at - now).total_seconds()
+            try:
+                delta = (failover.scheduled_at - now).total_seconds()
 
-            if delta > 10:
-                logging.info('Awaiting failover at {0} (in {1:.0f} seconds)'.format(failover.scheduled_at.isoformat(),
-                                                                                    delta))
-                return
-            elif delta < -15:
-                logger.warning('Found a stale failover value, cleaning up: {}'.format(failover.scheduled_at))
-                self.dcs.manual_failover('', '', self.cluster.failover.index)
-                return
+                if delta > 10:
+                    logging.info('Awaiting failover at %s (in %.0f seconds)', failover.scheduled_at.isoformat(), delta)
+                    return
+                elif delta < -15:
+                    logger.warning('Found a stale failover value, cleaning up: %s', failover.scheduled_at)
+                    self.dcs.manual_failover('', '', self.cluster.failover.index)
+                    return
 
-            # The value is very close to now
-            time.sleep(max(delta, 0))
-            logger.info('Manual scheduled failover at {}'.format(failover.scheduled_at.isoformat()))
+                # The value is very close to now
+                sleep(max(delta, 0))
+                logger.info('Manual scheduled failover at {}'.format(failover.scheduled_at.isoformat()))
+            except TypeError:
+                logger.warning('Incorrect value in of scheduled_at: %s', failover.scheduled_at)
 
         if not failover.leader or failover.leader == self.state_handler.name:
             if not failover.member or failover.member != self.state_handler.name:

tests/test_ha.py

@@ -297,7 +297,6 @@ class TestHa(unittest.TestCase):
         self.ha.update_lock = false
         self.assertEquals(self.ha.run_cycle(), 'failed to update leader lock during restart')
 
-
     @patch('requests.get', requests_get)
     def test_manual_failover_from_leader(self):
         self.ha.has_lock = true
@@ -316,11 +315,10 @@ class TestHa(unittest.TestCase):
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, 'blabla', MockPostgresql.name, None))
         self.assertEquals(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
 
-        ## Failover scheduled time must include timezone
+        # Failover scheduled time must include timezone
         scheduled = datetime.datetime.now()
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, 'blabla', MockPostgresql.name, scheduled))
-
-        self.assertRaises(TypeError, self.ha.run_cycle)
+        self.ha.run_cycle()
 
         scheduled = datetime.datetime.utcnow().replace(tzinfo=pytz.UTC)
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, 'blabla', MockPostgresql.name, scheduled))