mirror of
https://github.com/outbackdingo/patroni.git
synced 2026-08-25 14:53:37 +00:00
Alexander KukushkinandGitHub
77382e75dc
Old versions of `kazoo` immediately discarded all requests to Zookeeper if the connection is in the `SUSPENDED` state. This is absolutely fine because Patroni is handling retries on its own. Starting from 2.7, kazoo started queueing requests instead of discarding and as a result, the Patroni HA loop was getting stuck until the connection to Zookeeper is reestablished, causing no demote of the Postgres. In order to return to the old behavior we override the `KazooClient._call()` method. In addition to that, we ensure that the `Postgresql.reset_cluster_info_state()` method is called even if DCS failed (the order of calls was changed in the #1820). Close https://github.com/zalando/patroni/issues/1981
259 lines
10 KiB
Python
259 lines
10 KiB
Python
import select
|
|
import six
|
|
import unittest
|
|
|
|
from kazoo.client import KazooClient, KazooState
|
|
from kazoo.exceptions import NoNodeError, NodeExistsError
|
|
from kazoo.handlers.threading import SequentialThreadingHandler
|
|
from kazoo.protocol.states import KeeperState, ZnodeStat
|
|
from mock import Mock, patch
|
|
from patroni.dcs.zookeeper import Leader, PatroniKazooClient,\
|
|
PatroniSequentialThreadingHandler, ZooKeeper, ZooKeeperError
|
|
|
|
|
|
class MockKazooClient(Mock):
|
|
|
|
leader = False
|
|
exists = True
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super(MockKazooClient, self).__init__()
|
|
self._session_timeout = 30000
|
|
|
|
@property
|
|
def client_id(self):
|
|
return (-1, '')
|
|
|
|
@staticmethod
|
|
def retry(func, *args, **kwargs):
|
|
return func(*args, **kwargs)
|
|
|
|
def get(self, path, watch=None):
|
|
if not isinstance(path, six.string_types):
|
|
raise TypeError("Invalid type for 'path' (string expected)")
|
|
if path == '/broken/status':
|
|
return (b'{', ZnodeStat(0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0))
|
|
elif path in ('/no_node', '/legacy/status'):
|
|
raise NoNodeError
|
|
elif '/members/' in path:
|
|
return (
|
|
b'postgres://repuser:rep-pass@localhost:5434/postgres?application_name=http://127.0.0.1:8009/patroni',
|
|
ZnodeStat(0, 0, 0, 0, 0, 0, 0, 0 if self.exists else -1, 0, 0, 0)
|
|
)
|
|
elif path.endswith('/optime/leader'):
|
|
return (b'500', ZnodeStat(0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0))
|
|
elif path.endswith('/leader'):
|
|
if self.leader:
|
|
return (b'foo', ZnodeStat(0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0))
|
|
return (b'foo', ZnodeStat(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0))
|
|
elif path.endswith('/initialize'):
|
|
return (b'foo', ZnodeStat(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0))
|
|
elif path.endswith('/status'):
|
|
return (b'{"optime":500,"slots":{"ls":1234567}}', ZnodeStat(0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0))
|
|
return (b'', ZnodeStat(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0))
|
|
|
|
@staticmethod
|
|
def get_children(path, watch=None, include_data=False):
|
|
if not isinstance(path, six.string_types):
|
|
raise TypeError("Invalid type for 'path' (string expected)")
|
|
if path.startswith('/no_node'):
|
|
raise NoNodeError
|
|
elif path in ['/service/bla/', '/service/test/']:
|
|
return ['initialize', 'leader', 'members', 'optime', 'failover', 'sync']
|
|
return ['foo', 'bar', 'buzz']
|
|
|
|
def create(self, path, value=b"", acl=None, ephemeral=False, sequence=False, makepath=False):
|
|
if not isinstance(path, six.string_types):
|
|
raise TypeError("Invalid type for 'path' (string expected)")
|
|
if not isinstance(value, (six.binary_type,)):
|
|
raise TypeError("Invalid type for 'value' (must be a byte string)")
|
|
if b'Exception' in value:
|
|
raise Exception
|
|
if path.endswith('/initialize') or path == '/service/test/optime/leader':
|
|
raise Exception
|
|
elif b'retry' in value or (b'exists' in value and self.exists):
|
|
raise NodeExistsError
|
|
|
|
def create_async(self, path, value=b"", acl=None, ephemeral=False, sequence=False, makepath=False):
|
|
return self.create(path, value, acl, ephemeral, sequence, makepath) or Mock()
|
|
|
|
@staticmethod
|
|
def set(path, value, version=-1):
|
|
if not isinstance(path, six.string_types):
|
|
raise TypeError("Invalid type for 'path' (string expected)")
|
|
if not isinstance(value, (six.binary_type,)):
|
|
raise TypeError("Invalid type for 'value' (must be a byte string)")
|
|
if path == '/service/bla/optime/leader':
|
|
raise Exception
|
|
if path == '/service/test/members/bar' and b'retry' in value:
|
|
return
|
|
if path in ('/service/test/failover', '/service/test/config', '/service/test/sync'):
|
|
if b'Exception' in value:
|
|
raise Exception
|
|
elif value == b'ok':
|
|
return
|
|
raise NoNodeError
|
|
|
|
def set_async(self, path, value, version=-1):
|
|
return self.set(path, value, version) or Mock()
|
|
|
|
def delete(self, path, version=-1, recursive=False):
|
|
if not isinstance(path, six.string_types):
|
|
raise TypeError("Invalid type for 'path' (string expected)")
|
|
self.exists = False
|
|
if path == '/service/test/leader':
|
|
self.leader = True
|
|
raise Exception
|
|
elif path == '/service/test/members/buzz':
|
|
raise Exception
|
|
elif path.endswith('/') or path.endswith('/initialize') or path == '/service/test/members/bar':
|
|
raise NoNodeError
|
|
|
|
def delete_async(self, path, version=-1, recursive=False):
|
|
return self.delete(path, version, recursive) or Mock()
|
|
|
|
|
|
class TestPatroniSequentialThreadingHandler(unittest.TestCase):
|
|
|
|
def setUp(self):
|
|
self.handler = PatroniSequentialThreadingHandler(10)
|
|
|
|
@patch.object(SequentialThreadingHandler, 'create_connection', Mock())
|
|
def test_create_connection(self):
|
|
self.assertIsNotNone(self.handler.create_connection(()))
|
|
self.assertIsNotNone(self.handler.create_connection((), 40))
|
|
self.assertIsNotNone(self.handler.create_connection(timeout=40))
|
|
|
|
@patch.object(SequentialThreadingHandler, 'select', Mock(side_effect=ValueError))
|
|
def test_select(self):
|
|
self.assertRaises(select.error, self.handler.select)
|
|
|
|
|
|
class TestPatroniKazooClient(unittest.TestCase):
|
|
|
|
def test__call(self):
|
|
c = PatroniKazooClient()
|
|
with patch.object(KazooClient, '_call', Mock()):
|
|
self.assertIsNotNone(c._call(None, Mock()))
|
|
c._state = KeeperState.CONNECTING
|
|
self.assertFalse(c._call(None, Mock()))
|
|
|
|
|
|
class TestZooKeeper(unittest.TestCase):
|
|
|
|
@patch('patroni.dcs.zookeeper.PatroniKazooClient', MockKazooClient)
|
|
def setUp(self):
|
|
self.zk = ZooKeeper({'hosts': ['localhost:2181'], 'scope': 'test',
|
|
'name': 'foo', 'ttl': 30, 'retry_timeout': 10, 'loop_wait': 10})
|
|
|
|
def test_session_listener(self):
|
|
self.zk.session_listener(KazooState.SUSPENDED)
|
|
|
|
def test_reload_config(self):
|
|
self.zk.reload_config({'ttl': 20, 'retry_timeout': 10, 'loop_wait': 10})
|
|
self.zk.reload_config({'ttl': 20, 'retry_timeout': 10, 'loop_wait': 5})
|
|
|
|
def test_get_node(self):
|
|
self.assertIsNone(self.zk.get_node('/no_node'))
|
|
|
|
def test_get_children(self):
|
|
self.assertListEqual(self.zk.get_children('/no_node'), [])
|
|
|
|
def test__inner_load_cluster(self):
|
|
self.zk._base_path = self.zk._base_path.replace('test', 'bla')
|
|
self.zk._inner_load_cluster()
|
|
self.zk._base_path = self.zk._base_path = '/broken'
|
|
self.zk._inner_load_cluster()
|
|
self.zk._base_path = self.zk._base_path = '/legacy'
|
|
self.zk._inner_load_cluster()
|
|
self.zk._base_path = self.zk._base_path = '/no_node'
|
|
self.zk._inner_load_cluster()
|
|
|
|
def test_get_cluster(self):
|
|
self.assertRaises(ZooKeeperError, self.zk.get_cluster)
|
|
cluster = self.zk.get_cluster(True)
|
|
self.assertIsInstance(cluster.leader, Leader)
|
|
self.zk.touch_member({'foo': 'foo'})
|
|
self.zk._name = 'bar'
|
|
self.zk.status_watcher(None)
|
|
with patch.object(ZooKeeper, 'get_node', Mock(side_effect=Exception)):
|
|
self.zk.get_cluster()
|
|
cluster = self.zk.get_cluster()
|
|
self.assertEqual(cluster.last_lsn, 500)
|
|
|
|
def test_delete_leader(self):
|
|
self.assertTrue(self.zk.delete_leader())
|
|
|
|
def test_set_failover_value(self):
|
|
self.zk.set_failover_value('')
|
|
self.zk.set_failover_value('ok')
|
|
self.zk.set_failover_value('Exception')
|
|
|
|
def test_set_config_value(self):
|
|
self.zk.set_config_value('', 1)
|
|
self.zk.set_config_value('ok')
|
|
self.zk.set_config_value('Exception')
|
|
|
|
def test_initialize(self):
|
|
self.assertFalse(self.zk.initialize())
|
|
|
|
def test_cancel_initialization(self):
|
|
self.zk.cancel_initialization()
|
|
|
|
def test_touch_member(self):
|
|
self.zk._name = 'buzz'
|
|
self.zk.get_cluster()
|
|
self.zk.touch_member({'new': 'new'})
|
|
self.zk._name = 'bar'
|
|
self.zk.touch_member({'new': 'new'})
|
|
self.zk._name = 'na'
|
|
self.zk._client.exists = 1
|
|
self.zk.touch_member({'Exception': 'Exception'})
|
|
self.zk._name = 'bar'
|
|
self.zk.touch_member({'retry': 'retry'})
|
|
self.zk._fetch_cluster = True
|
|
self.zk.get_cluster()
|
|
self.zk.touch_member({'conn_url': 'postgres://repuser:rep-pass@localhost:5434/postgres',
|
|
'api_url': 'http://127.0.0.1:8009/patroni'})
|
|
|
|
def test_take_leader(self):
|
|
self.zk.take_leader()
|
|
with patch.object(MockKazooClient, 'create', Mock(side_effect=Exception)):
|
|
self.zk.take_leader()
|
|
|
|
def test_update_leader(self):
|
|
self.assertTrue(self.zk.update_leader(12345))
|
|
|
|
def test_write_leader_optime(self):
|
|
self.zk.last_lsn = '0'
|
|
self.zk.write_leader_optime('1')
|
|
with patch.object(MockKazooClient, 'create_async', Mock()):
|
|
self.zk.write_leader_optime('1')
|
|
with patch.object(MockKazooClient, 'set_async', Mock()):
|
|
self.zk.write_leader_optime('2')
|
|
self.zk._base_path = self.zk._base_path.replace('test', 'bla')
|
|
self.zk.write_leader_optime('3')
|
|
|
|
def test_delete_cluster(self):
|
|
self.assertTrue(self.zk.delete_cluster())
|
|
|
|
def test_watch(self):
|
|
self.zk.watch(None, 0)
|
|
self.zk.event.isSet = Mock(return_value=True)
|
|
self.zk._fetch_status = False
|
|
self.zk.watch(None, 0)
|
|
|
|
def test__kazoo_connect(self):
|
|
self.zk._client._retry.deadline = 1
|
|
self.zk._orig_kazoo_connect = Mock(return_value=(0, 0))
|
|
self.zk._kazoo_connect(None, None)
|
|
|
|
def test_sync_state(self):
|
|
self.zk.set_sync_state_value('')
|
|
self.zk.set_sync_state_value('ok')
|
|
self.zk.set_sync_state_value('Exception')
|
|
self.zk.delete_sync_state()
|
|
|
|
def test_set_history_value(self):
|
|
self.zk.set_history_value('{}')
|