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Optional fencing script (pre_promote) (#1099)

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Call a fencing script after acquiring the leader lock. If the script didn't finish successfully - don't promote but remove leader key

Close https://github.com/zalando/patroni/issues/1567
This commit is contained in:
Sergey Dudoladov
2020-09-01 07:50:39 +02:00
committed by GitHub
parent e87fc12aeb
commit 950eff27ad
8 changed files with 127 additions and 25 deletions
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tests/test_postgresql.py
+15 -3
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@@ -357,10 +357,22 @@ class TestPostgresql(BaseTestPostgresql):
mock_is_running.return_value = False
self.assertFalse(self.p.is_healthy())
def test_promote(self):
@patch('psutil.Popen')
def test_promote(self, mock_popen):
mock_popen.return_value.wait.return_value = 0
task = CriticalTask()
self.assertTrue(self.p.promote(0, task))
self.p.set_role('replica')
self.assertIsNone(self.p.promote(0))
self.assertTrue(self.p.promote(0))
self.p.config._config['pre_promote'] = 'test'
with patch('patroni.postgresql.cancellable.CancellableSubprocess.is_cancelled', PropertyMock(return_value=1)):
self.assertFalse(self.p.promote(0, task))
mock_popen.side_effect = Exception
self.assertFalse(self.p.promote(0, task))
task.reset()
task.cancel()
self.assertFalse(self.p.promote(0, task))
def test_timeline_wal_position(self):
self.assertEqual(self.p.timeline_wal_position(), (1, 2, 1))