patroni/tests/test_zookeeper.py

import six
import unittest

from mock import Mock, patch
from patroni.dcs import Leader
from patroni.zookeeper import ExhibitorEnsembleProvider, ZooKeeper, ZooKeeperError
from kazoo.client import KazooState
from kazoo.exceptions import NoNodeError, NodeExistsError
from kazoo.protocol.states import ZnodeStat
from test_etcd import SleepException, requests_get


class MockKazooClient(Mock):

    leader = False
    exists = True
    handler = Mock()

    @property
    def client_id(self):
        return (-1, '')

    def retry(self, func, *args, **kwargs):
        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 == '/no_node':
            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'1', ZnodeStat(0, 0, 0, 0, 0, 0, 0, 0, 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))
        return (b'', ZnodeStat(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0))

    def get_children(self, path, watch=None, include_data=False):
        if not isinstance(path, six.string_types):
            raise TypeError("Invalid type for 'path' (string expected)")
        if path == '/no_node':
            raise NoNodeError
        elif path in ['/service/bla/', '/service/test/']:
            return ['initialize', 'leader', 'members', 'optime', 'failover']
        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 path.endswith('/initialize') or path == '/service/test/optime/leader':
            raise Exception
        elif value == b'retry' or (value == b'exists' and self.exists):
            raise NodeExistsError

    def set(self, 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/failover':
            if value == b'Exception':
                raise Exception
            elif value == b'ok':
                return
        raise NoNodeError

    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':
            if self.leader:
                return
            self.leader = True
            raise Exception
        elif path.endswith('/initialize'):
            raise NoNodeError


@patch('requests.get', requests_get)
@patch('patroni.zookeeper.sleep', Mock(side_effect=SleepException()))
class TestExhibitorEnsembleProvider(unittest.TestCase):

    def test_init(self):
        self.assertRaises(SleepException, ExhibitorEnsembleProvider, ['localhost'], 8181)


class TestZooKeeper(unittest.TestCase):

    @patch('requests.get', requests_get)
    @patch('patroni.zookeeper.KazooClient', MockKazooClient)
    def setUp(self):
        self.zk = ZooKeeper('foo', {'exhibitor': {'hosts': ['localhost', 'exhibitor'], 'port': 8181}, 'scope': 'test'})

    def test_session_listener(self):
        self.zk.session_listener(KazooState.SUSPENDED)

    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()

    def test_get_cluster(self):
        self.assertRaises(ZooKeeperError, self.zk.get_cluster)
        self.zk.exhibitor.poll = lambda: True
        cluster = self.zk.get_cluster()
        self.assertIsInstance(cluster.leader, Leader)
        self.zk.touch_member('foo')
        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_initialize(self):
        self.assertFalse(self.zk.initialize())

    def test_cancel_initialization(self):
        self.zk.cancel_initialization()

    def test_touch_member(self):
        self.zk.touch_member('new')
        self.zk.touch_member('exists')
        self.zk.touch_member('retry')
        self.zk.client.exists = True
        self.zk.touch_member('retry')

    def test_take_leader(self):
        self.zk.take_leader()

    def test_update_leader(self):
        self.assertTrue(self.zk.update_leader())

    def test_write_leader_optime(self):
        self.zk.last_leader_operation = '0'
        self.zk.write_leader_optime('1')
        self.zk._base_path = self.zk._base_path.replace('test', 'bla')
        self.zk.write_leader_optime('2')

    def test_watch(self):
        self.zk.watch(0)
        self.zk.cluster_event.isSet = lambda: False
        self.zk.watch(0)