Introduce Status class (#2853)

It represents the `/status` key in DCS and makes it easier to introduce new values stored in the `/status` key without need to refactor all DCS implementations.

patroni/dcs/__init__.py

@@ -778,16 +778,71 @@ class TimelineHistory(NamedTuple):
         return TimelineHistory(version, value, lines)
 
 
+class Status(NamedTuple):
+    """Immutable object (namedtuple) which represents `/status` key.
+
+    Consists of the following fields:
+
+    :ivar last_lsn: :class:`int` object containing position of last known leader LSN.
+    :ivar slots: state of permanent replication slots on the primary in the format: ``{"slot_name": int}``.
+    """
+    last_lsn: int
+    slots: Optional[Dict[str, int]]
+
+    @staticmethod
+    def empty() -> 'Status':
+        """Construct an empty :class:`Status` instance.
+
+        :returns: empty :class:`Status` object.
+        """
+        return Status(0, None)
+
+    @staticmethod
+    def from_node(value: Union[str, Dict[str, Any], None]) -> 'Status':
+        """Factory method to parse *value* as :class:`Status` object.
+
+        :param value: JSON serialized string
+
+        :returns: constructed :class:`Status` object.
+        """
+        try:
+            if isinstance(value, str):
+                value = json.loads(value)
+        except Exception:
+            return Status.empty()
+
+        if isinstance(value, int):  # legacy
+            return Status(value, None)
+
+        if not isinstance(value, dict):
+            return Status.empty()
+
+        try:
+            last_lsn = int(value.get('optime', ''))
+        except Exception:
+            last_lsn = 0
+
+        slots: Union[str, Dict[str, int], None] = value.get('slots')
+        if isinstance(slots, str):
+            try:
+                slots = json.loads(slots)
+            except Exception:
+                slots = None
+        if not isinstance(slots, dict):
+            slots = None
+
+        return Status(last_lsn, slots)
+
+
 class Cluster(NamedTuple('Cluster',
                          [('initialize', Optional[str]),
                           ('config', Optional[ClusterConfig]),
                           ('leader', Optional[Leader]),
-                          ('last_lsn', int),
+                          ('status', Status),
                           ('members', List[Member]),
                           ('failover', Optional[Failover]),
                           ('sync', SyncState),
                           ('history', Optional[TimelineHistory]),
-                          ('slots', Optional[Dict[str, int]]),
                           ('failsafe', Optional[Dict[str, str]]),
                           ('workers', Dict[int, 'Cluster'])])):
     """Immutable object (namedtuple) which represents PostgreSQL or Citus cluster.
@@ -801,13 +856,11 @@ class Cluster(NamedTuple('Cluster',
     :ivar initialize: shows whether this cluster has initialization key stored in DC or not.
     :ivar config: global dynamic configuration, reference to `ClusterConfig` object.
     :ivar leader: :class:`Leader` object which represents current leader of the cluster.
-    :ivar last_lsn: :class:int object containing position of last known leader LSN.
-                     This value is stored in the `/status` key or `/optime/leader` (legacy) key.
+    :ivar status: :class:`Status` object which represents the `/status` key.
     :ivar members: list of:class:` Member` objects, all PostgreSQL cluster members including leader
     :ivar failover: reference to :class:`Failover` object.
     :ivar sync: reference to :class:`SyncState` object, last observed synchronous replication state.
     :ivar history: reference to `TimelineHistory` object.
-    :ivar slots: state of permanent logical replication slots on the primary in the format: {"slot_name": int}.
     :ivar failsafe: failsafe topology. Node is allowed to become the leader only if its name is found in this list.
     :ivar workers: dictionary of workers of the Citus cluster, optional. Each key is an :class:`int` representing
                    the group, and the corresponding value is a :class:`Cluster` instance.
@@ -819,10 +872,20 @@ class Cluster(NamedTuple('Cluster',
             kwargs['workers'] = {}
         return super(Cluster, cls).__new__(cls, *args, **kwargs)
 
+    @property
+    def last_lsn(self) -> int:
+        """Last known leader LSN."""
+        return self.status.last_lsn
+
+    @property
+    def slots(self) -> Optional[Dict[str, int]]:
+        """State of permanent replication slots on the primary in the format: ``{"slot_name": int}``."""
+        return self.status.slots
+
     @staticmethod
     def empty() -> 'Cluster':
         """Produce an empty :class:`Cluster` instance."""
-        return Cluster(None, None, None, 0, [], None, SyncState.empty(), None, None, None, {})
+        return Cluster(None, None, None, Status.empty(), [], None, SyncState.empty(), None, None, {})
 
     def is_empty(self):
         """Validate definition of all attributes of this :class:`Cluster` instance.
@@ -845,7 +908,7 @@ class Cluster(NamedTuple('Cluster',
 
            >>> assert bool(cluster) is False
 
-           >>> cluster = Cluster(None, None, None, 0, [1, 2, 3], None, SyncState.empty(), None, None, None, {})
+           >>> cluster = Cluster(None, None, None, Status(0, None), [1, 2, 3], None, SyncState.empty(), None, None, {})
            >>> len(cluster)
            1
 
@@ -1147,19 +1210,20 @@ class Cluster(NamedTuple('Cluster',
         :Example:
 
             No history provided:
-            >>> Cluster(0, 0, 0, 0, 0, 0, 0, 0, 0, None, {}).timeline
+            >>> Cluster(0, 0, 0, Status.empty(), 0, 0, 0, 0,  None, {}).timeline
             0
 
             Empty history assume timeline is ``1``:
-            >>> Cluster(0, 0, 0, 0, 0, 0, 0, TimelineHistory.from_node(1, '[]'), 0, None, {}).timeline
+            >>> Cluster(0, 0, 0, Status.empty(), 0, 0, 0, TimelineHistory.from_node(1, '[]'),  None, {}).timeline
             1
 
             Invalid history format, a string of ``a``, returns ``0``:
-            >>> Cluster(0, 0, 0, 0, 0, 0, 0, TimelineHistory.from_node(1, '[["a"]]'), 0, None, {}).timeline
+            >>> Cluster(0, 0, 0, Status.empty(), 0, 0, 0, TimelineHistory.from_node(1, '[["a"]]'), None, {}).timeline
             0
 
             History as a list of strings:
-            >>> Cluster(0, 0, 0, 0, 0, 0, 0, TimelineHistory.from_node(1, '[["3", "2", "1"]]'), 0, None, {}).timeline
+            >>> history = TimelineHistory.from_node(1, '[["3", "2", "1"]]')
+            >>> Cluster(0, 0, 0, Status.empty(), 0, 0, 0, history, None, {}).timeline
             4
         """
         if self.history:

patroni/dcs/consul.py

@@ -15,7 +15,7 @@ from urllib3.exceptions import HTTPError
 from urllib.parse import urlencode, urlparse, quote
 from typing import Any, Callable, Dict, List, Mapping, NamedTuple, Optional, Union, Tuple, TYPE_CHECKING
 
-from . import AbstractDCS, Cluster, ClusterConfig, Failover, Leader, Member, SyncState, \
+from . import AbstractDCS, Cluster, ClusterConfig, Failover, Leader, Member, Status, SyncState, \
     TimelineHistory, ReturnFalseException, catch_return_false_exception, citus_group_re
 from ..exceptions import DCSError
 from ..utils import deep_compare, parse_bool, Retry, RetryFailedError, split_host_port, uri, USER_AGENT
@@ -383,23 +383,8 @@ class Consul(AbstractDCS):
         history = history and TimelineHistory.from_node(history['ModifyIndex'], history['Value'])
 
         # get last known leader lsn and slots
-        status = nodes.get(self._STATUS)
-        if status:
-            try:
-                status = json.loads(status['Value'])
-                last_lsn = status.get(self._OPTIME)
-                slots = status.get('slots')
-            except Exception:
-                slots = last_lsn = None
-        else:
-            last_lsn = nodes.get(self._LEADER_OPTIME)
-            last_lsn = last_lsn and last_lsn['Value']
-            slots = None
-
-        try:
-            last_lsn = int(last_lsn or '')
-        except Exception:
-            last_lsn = 0
+        status = nodes.get(self._STATUS) or nodes.get(self._LEADER_OPTIME)
+        status = Status.from_node(status and status['Value'])
 
         # get list of members
         members = [self.member(n) for k, n in nodes.items() if k.startswith(self._MEMBERS) and k.count('/') == 1]
@@ -428,7 +413,7 @@ class Consul(AbstractDCS):
         except Exception:
             failsafe = None
 
-        return Cluster(initialize, config, leader, last_lsn, members, failover, sync, history, slots, failsafe)
+        return Cluster(initialize, config, leader, status, members, failover, sync, history, failsafe)
 
     @property
     def _consistency(self) -> str:

patroni/dcs/etcd.py

@@ -21,7 +21,7 @@ from urllib.parse import urlparse
 from urllib3 import Timeout
 from urllib3.exceptions import HTTPError, ReadTimeoutError, ProtocolError
 
-from . import AbstractDCS, Cluster, ClusterConfig, Failover, Leader, Member, SyncState, \
+from . import AbstractDCS, Cluster, ClusterConfig, Failover, Leader, Member, Status, SyncState, \
     TimelineHistory, ReturnFalseException, catch_return_false_exception, citus_group_re
 from ..exceptions import DCSError
 from ..request import get as requests_get
@@ -677,23 +677,8 @@ class Etcd(AbstractEtcd):
         history = history and TimelineHistory.from_node(history.modifiedIndex, history.value)
 
         # get last know leader lsn and slots
-        status = nodes.get(self._STATUS)
-        if status:
-            try:
-                status = json.loads(status.value)
-                last_lsn = status.get(self._OPTIME)
-                slots = status.get('slots')
-            except Exception:
-                slots = last_lsn = None
-        else:
-            last_lsn = nodes.get(self._LEADER_OPTIME)
-            last_lsn = last_lsn and last_lsn.value
-            slots = None
-
-        try:
-            last_lsn = int(last_lsn or '')
-        except Exception:
-            last_lsn = 0
+        status = nodes.get(self._STATUS) or nodes.get(self._LEADER_OPTIME)
+        status = Status.from_node(status and status.value)
 
         # get list of members
         members = [self.member(n) for k, n in nodes.items() if k.startswith(self._MEMBERS) and k.count('/') == 1]
@@ -722,7 +707,7 @@ class Etcd(AbstractEtcd):
         except Exception:
             failsafe = None
 
-        return Cluster(initialize, config, leader, last_lsn, members, failover, sync, history, slots, failsafe)
+        return Cluster(initialize, config, leader, status, members, failover, sync, history, failsafe)
 
     def _cluster_loader(self, path: str) -> Cluster:
         result = self.retry(self._client.read, path, recursive=True, quorum=self._ctl)

patroni/dcs/etcd3.py

@@ -15,7 +15,7 @@ from urllib3.exceptions import ReadTimeoutError, ProtocolError
 from threading import Condition, Lock, Thread
 from typing import Any, Callable, Collection, Dict, Iterator, List, Optional, Tuple, Type, TYPE_CHECKING, Union
 
-from . import ClusterConfig, Cluster, Failover, Leader, Member, SyncState, \
+from . import ClusterConfig, Cluster, Failover, Leader, Member, Status, SyncState, \
     TimelineHistory, catch_return_false_exception, citus_group_re
 from .etcd import AbstractEtcdClientWithFailover, AbstractEtcd, catch_etcd_errors, DnsCachingResolver, Retry
 from ..exceptions import DCSError, PatroniException
@@ -723,23 +723,8 @@ class Etcd3(AbstractEtcd):
         history = history and TimelineHistory.from_node(history['mod_revision'], history['value'])
 
         # get last know leader lsn and slots
-        status = nodes.get(self._STATUS)
-        if status:
-            try:
-                status = json.loads(status['value'])
-                last_lsn = status.get(self._OPTIME)
-                slots = status.get('slots')
-            except Exception:
-                slots = last_lsn = None
-        else:
-            last_lsn = nodes.get(self._LEADER_OPTIME)
-            last_lsn = last_lsn and last_lsn['value']
-            slots = None
-
-        try:
-            last_lsn = int(last_lsn or '')
-        except Exception:
-            last_lsn = 0
+        status = nodes.get(self._STATUS) or nodes.get(self._LEADER_OPTIME)
+        status = Status.from_node(status and status['value'])
 
         # get list of members
         members = [self.member(n) for k, n in nodes.items() if k.startswith(self._MEMBERS) and k.count('/') == 1]
@@ -770,7 +755,7 @@ class Etcd3(AbstractEtcd):
         except Exception:
             failsafe = None
 
-        return Cluster(initialize, config, leader, last_lsn, members, failover, sync, history, slots, failsafe)
+        return Cluster(initialize, config, leader, status, members, failover, sync, history, failsafe)
 
     def _cluster_loader(self, path: str) -> Cluster:
         nodes = {node['key'][len(path):]: node

patroni/dcs/kubernetes.py

@@ -19,7 +19,7 @@ from urllib3.exceptions import HTTPError
 from threading import Condition, Lock, Thread
 from typing import Any, Callable, Collection, Dict, List, Optional, Tuple, Type, Union, TYPE_CHECKING
 
-from . import AbstractDCS, Cluster, ClusterConfig, Failover, Leader, Member, SyncState, \
+from . import AbstractDCS, Cluster, ClusterConfig, Failover, Leader, Member, Status, SyncState, \
     TimelineHistory, CITUS_COORDINATOR_GROUP_ID, citus_group_re
 from ..exceptions import DCSError
 from ..utils import deep_compare, iter_response_objects, keepalive_socket_options, \
@@ -888,18 +888,8 @@ class Kubernetes(AbstractDCS):
             self._leader_resource_version = metadata.resource_version if metadata else None
         annotations: Dict[str, str] = metadata and metadata.annotations or {}
 
-        # get last known leader lsn
-        try:
-            last_lsn = int(annotations.get(self._OPTIME, ''))
-        except Exception:
-            last_lsn = 0
-
-        # get permanent slots state (confirmed_flush_lsn)
-        slots = annotations.get('slots')
-        try:
-            slots = json.loads(annotations.get('slots', ''))
-        except Exception:
-            slots = None
+        # get last known leader lsn and slots
+        status = Status.from_node(annotations)
 
         # get failsafe topology
         try:
@@ -945,7 +935,7 @@ class Kubernetes(AbstractDCS):
         metadata = sync and sync.metadata
         sync = SyncState.from_node(metadata and metadata.resource_version, metadata and metadata.annotations)
 
-        return Cluster(initialize, config, leader, last_lsn, members, failover, sync, history, slots, failsafe)
+        return Cluster(initialize, config, leader, status, members, failover, sync, history, failsafe)
 
     def _cluster_loader(self, path: Dict[str, Any]) -> Cluster:
         return self._cluster_from_nodes(path['group'], path['nodes'], path['pods'].values())

patroni/dcs/raft.py

@@ -12,7 +12,8 @@ from pysyncobj.transport import TCPTransport, CONNECTION_STATE
 from pysyncobj.utility import TcpUtility
 from typing import Any, Callable, Collection, Dict, List, Optional, Set, Union, TYPE_CHECKING
 
-from . import AbstractDCS, ClusterConfig, Cluster, Failover, Leader, Member, SyncState, TimelineHistory, citus_group_re
+from . import AbstractDCS, ClusterConfig, Cluster, Failover, Leader, Member, Status, SyncState, \
+    TimelineHistory, citus_group_re
 from ..exceptions import DCSError
 from ..utils import validate_directory
 if TYPE_CHECKING:  # pragma: no cover
@@ -343,23 +344,8 @@ class Raft(AbstractDCS):
         history = history and TimelineHistory.from_node(history['index'], history['value'])
 
         # get last know leader lsn and slots
-        status = nodes.get(self._STATUS)
-        if status:
-            try:
-                status = json.loads(status['value'])
-                last_lsn = status.get(self._OPTIME)
-                slots = status.get('slots')
-            except Exception:
-                slots = last_lsn = None
-        else:
-            last_lsn = nodes.get(self._LEADER_OPTIME)
-            last_lsn = last_lsn and last_lsn['value']
-            slots = None
-
-        try:
-            last_lsn = int(last_lsn or '')
-        except Exception:
-            last_lsn = 0
+        status = nodes.get(self._STATUS) or nodes.get(self._LEADER_OPTIME)
+        status = Status.from_node(status and status['value'])
 
         # get list of members
         members = [self.member(k, n) for k, n in nodes.items() if k.startswith(self._MEMBERS) and k.count('/') == 1]
@@ -387,7 +373,7 @@ class Raft(AbstractDCS):
         except Exception:
             failsafe = None
 
-        return Cluster(initialize, config, leader, last_lsn, members, failover, sync, history, slots, failsafe)
+        return Cluster(initialize, config, leader, status, members, failover, sync, history, failsafe)
 
     def _cluster_loader(self, path: str) -> Cluster:
         response = self._sync_obj.get(path, recursive=True)

patroni/dcs/zookeeper.py

@@ -12,7 +12,8 @@ from kazoo.retry import RetryFailedError
 from kazoo.security import ACL, make_acl
 from typing import Any, Callable, Dict, List, Optional, Union, Tuple, TYPE_CHECKING
 
-from . import AbstractDCS, ClusterConfig, Cluster, Failover, Leader, Member, SyncState, TimelineHistory, citus_group_re
+from . import AbstractDCS, ClusterConfig, Cluster, Failover, Leader, Member, Status, SyncState, \
+    TimelineHistory, citus_group_re
 from ..exceptions import DCSError
 from ..utils import deep_compare
 if TYPE_CHECKING:  # pragma: no cover
@@ -200,29 +201,15 @@ class ZooKeeper(AbstractDCS):
         except NoNodeError:
             return None
 
-    def get_status(self, path: str, leader: Optional[Leader]) -> Tuple[int, Optional[Dict[str, int]]]:
+    def get_status(self, path: str, leader: Optional[Leader]) -> Status:
         watch = self.status_watcher if not leader or leader.name != self._name else None
 
         status = self.get_node(path + self._STATUS, watch)
+        if not status:
+            status = self.get_node(path + self._LEADER_OPTIME, watch)
         if status:
-            try:
-                status = json.loads(status[0])
-                last_lsn = status.get(self._OPTIME)
-                slots = status.get('slots')
-            except Exception:
-                slots = last_lsn = None
-        else:
-            last_lsn = self.get_node(path + self._LEADER_OPTIME, watch)
-            last_lsn = last_lsn and last_lsn[0]
-            slots = None
-
-        try:
-            last_lsn = int(last_lsn or '')
-        except Exception:
-            last_lsn = 0
-
-        self._fetch_status = False
-        return last_lsn, slots
+            self._fetch_status = False
+        return Status.from_node(status and status[0])
 
     @staticmethod
     def member(name: str, value: str, znode: ZnodeStat) -> Member:
@@ -276,7 +263,7 @@ class ZooKeeper(AbstractDCS):
             self._fetch_cluster = member.version == -1
 
         # get last known leader lsn and slots
-        last_lsn, slots = self.get_status(path, leader)
+        status = self.get_status(path, leader)
 
         # failover key
         failover = self.get_node(path + self._FAILOVER, watch=self.cluster_watcher) if self._FAILOVER in nodes else None
@@ -289,7 +276,7 @@ class ZooKeeper(AbstractDCS):
         except Exception:
             failsafe = None
 
-        return Cluster(initialize, config, leader, last_lsn, members, failover, sync, history, slots, failsafe)
+        return Cluster(initialize, config, leader, status, members, failover, sync, history, failsafe)
 
     def _citus_cluster_loader(self, path: str) -> Dict[int, Cluster]:
         fetch_cluster = False
@@ -320,11 +307,10 @@ class ZooKeeper(AbstractDCS):
                 self.event.clear()
             else:
                 try:
-                    last_lsn, slots = self.get_status(self.client_path(''), cluster.leader)
+                    status = self.get_status(self.client_path(''), cluster.leader)
                     self.event.clear()
                     new_cluster: List[Any] = list(cluster)
-                    new_cluster[3] = last_lsn
-                    new_cluster[8] = slots
+                    new_cluster[3] = status
                     cluster = Cluster(*new_cluster)
                 except Exception:
                     pass

patroni/ha.py

@@ -14,7 +14,7 @@ from . import psycopg
 from .__main__ import Patroni
 from .async_executor import AsyncExecutor, CriticalTask
 from .collections import CaseInsensitiveSet
-from .dcs import AbstractDCS, Cluster, Leader, Member, RemoteMember
+from .dcs import AbstractDCS, Cluster, Leader, Member, RemoteMember, Status
 from .exceptions import DCSError, PostgresConnectionException, PatroniFatalException
 from .postgresql.callback_executor import CallbackAction
 from .postgresql.misc import postgres_version_to_int
@@ -123,7 +123,8 @@ class Failsafe(object):
         leader = self.leader
         if leader:
             # We rely on the strict order of fields in the namedtuple
-            cluster = Cluster(*cluster[0:2], leader, *cluster[3:8], leader.member.data['slots'], *cluster[9:])
+            status = Status(cluster.status.last_lsn, leader.member.data['slots'])
+            cluster = Cluster(*cluster[0:2], leader, status, *cluster[4:])
         return cluster
 
     def is_active(self) -> bool:

tests/test_ha.py

@@ -6,7 +6,7 @@ import sys
 from mock import Mock, MagicMock, PropertyMock, patch, mock_open
 from patroni.collections import CaseInsensitiveSet
 from patroni.config import Config
-from patroni.dcs import Cluster, ClusterConfig, Failover, Leader, Member, get_dcs, SyncState, TimelineHistory
+from patroni.dcs import Cluster, ClusterConfig, Failover, Leader, Member, get_dcs, Status, SyncState, TimelineHistory
 from patroni.dcs.etcd import AbstractEtcdClientWithFailover
 from patroni.exceptions import DCSError, PostgresConnectionException, PatroniFatalException
 from patroni.ha import Ha, _MemberStatus
@@ -39,7 +39,7 @@ def get_cluster(initialize, leader, members, failover, sync, cluster_config=None
     history = TimelineHistory(1, '[[1,67197376,"no recovery target specified","' + t + '","foo"]]',
                               [(1, 67197376, 'no recovery target specified', t, 'foo')])
     cluster_config = cluster_config or ClusterConfig(1, {'check_timeline': True}, 1)
-    return Cluster(initialize, cluster_config, leader, 10, members, failover, sync, history, None, failsafe)
+    return Cluster(initialize, cluster_config, leader, Status(10, None), members, failover, sync, history, failsafe)
 
 
 def get_cluster_not_initialized_without_leader(cluster_config=None):

tests/test_slots.py

@@ -8,7 +8,7 @@ from threading import Thread
 
 from patroni import psycopg
 from patroni.config import GlobalConfig
-from patroni.dcs import Cluster, ClusterConfig, Member, SyncState
+from patroni.dcs import Cluster, ClusterConfig, Member, Status, SyncState
 from patroni.postgresql import Postgresql
 from patroni.postgresql.misc import fsync_dir
 from patroni.postgresql.slots import SlotsAdvanceThread, SlotsHandler
@@ -33,15 +33,15 @@ class TestSlotsHandler(BaseTestPostgresql):
         self.s = self.p.slots_handler
         self.p.start()
         config = ClusterConfig(1, {'slots': {'ls': {'database': 'a', 'plugin': 'b'}, 'ls2': None}}, 1)
-        self.cluster = Cluster(True, config, self.leader, 0, [self.me, self.other, self.leadermem],
-                               None, SyncState.empty(), None, {'ls': 12345, 'ls2': 12345}, None)
+        self.cluster = Cluster(True, config, self.leader, Status(0, {'ls': 12345, 'ls2': 12345}),
+                               [self.me, self.other, self.leadermem], None, SyncState.empty(), None, None)
 
     def test_sync_replication_slots(self):
         config = ClusterConfig(1, {'slots': {'test_3': {'database': 'a', 'plugin': 'b'},
                                              'A': 0, 'ls': 0, 'b': {'type': 'logical', 'plugin': '1'}},
                                    'ignore_slots': [{'name': 'blabla'}]}, 1)
-        cluster = Cluster(True, config, self.leader, 0, [self.me, self.other, self.leadermem],
-                          None, SyncState.empty(), None, {'test_3': 10}, None)
+        cluster = Cluster(True, config, self.leader, Status(0, {'test_3': 10}),
+                          [self.me, self.other, self.leadermem], None, SyncState.empty(), None, None)
         with mock.patch('patroni.postgresql.Postgresql._query', Mock(side_effect=psycopg.OperationalError)):
             self.s.sync_replication_slots(cluster, False)
         self.p.set_role('standby_leader')
@@ -77,9 +77,8 @@ class TestSlotsHandler(BaseTestPostgresql):
             'state': 'running', 'conn_url': 'postgres://replicator:[email protected]:5436/postgres',
             'tags': {'replicatefrom': 'postgresql0'}
         })
-        cluster = Cluster(True, config, self.leader, 0,
-                          [self.me, self.other, self.leadermem, cascading_replica],
-                          None, SyncState.empty(), None, {'ls': 10}, None)
+        cluster = Cluster(True, config, self.leader, Status(0, {'ls': 10}),
+                          [self.me, self.other, self.leadermem, cascading_replica], None, SyncState.empty(), None, None)
         self.p.set_role('replica')
         with patch.object(Postgresql, '_query') as mock_query, \
                 patch.object(Postgresql, 'is_primary', Mock(return_value=False)):
@@ -90,8 +89,8 @@ class TestSlotsHandler(BaseTestPostgresql):
     def test_process_permanent_slots(self):
         config = ClusterConfig(1, {'slots': {'ls': {'database': 'a', 'plugin': 'b'}},
                                    'ignore_slots': [{'name': 'blabla'}]}, 1)
-        cluster = Cluster(True, config, self.leader, 0, [self.me, self.other, self.leadermem],
-                          None, SyncState.empty(), None, None, None)
+        cluster = Cluster(True, config, self.leader, Status.empty(), [self.me, self.other, self.leadermem],
+                          None, SyncState.empty(), None, None)
 
         self.s.sync_replication_slots(cluster, False)
         with patch.object(Postgresql, '_query') as mock_query: