diff --git a/synapse/handlers/room_member.py b/synapse/handlers/room_member.py
index 01a6e88262..8feba8c90a 100644
--- a/synapse/handlers/room_member.py
+++ b/synapse/handlers/room_member.py
@@ -51,14 +51,12 @@ if TYPE_CHECKING:
logger = logging.getLogger(__name__)
-class RoomMemberHandler:
+class RoomMemberHandler(metaclass=abc.ABCMeta):
# TODO(paul): This handler currently contains a messy conflation of
# low-level API that works on UserID objects and so on, and REST-level
# API that takes ID strings and returns pagination chunks. These concerns
# ought to be separated out a lot better.
- __metaclass__ = abc.ABCMeta
-
def __init__(self, hs: "HomeServer"):
self.hs = hs
self.store = hs.get_datastore()
diff --git a/synapse/replication/http/_base.py b/synapse/replication/http/_base.py
index ba16f22c91..b448da6710 100644
--- a/synapse/replication/http/_base.py
+++ b/synapse/replication/http/_base.py
@@ -33,7 +33,7 @@ from synapse.util.stringutils import random_string
logger = logging.getLogger(__name__)
-class ReplicationEndpoint:
+class ReplicationEndpoint(metaclass=abc.ABCMeta):
"""Helper base class for defining new replication HTTP endpoints.
This creates an endpoint under `/_synapse/replication/:NAME/:PATH_ARGS..`
@@ -72,8 +72,6 @@ class ReplicationEndpoint:
is received.
"""
- __metaclass__ = abc.ABCMeta
-
NAME = abc.abstractproperty() # type: str # type: ignore
PATH_ARGS = abc.abstractproperty() # type: Tuple[str, ...] # type: ignore
METHOD = "POST"
diff --git a/synapse/storage/databases/main/account_data.py b/synapse/storage/databases/main/account_data.py
index 4436b1a83d..5f1a2b9aa6 100644
--- a/synapse/storage/databases/main/account_data.py
+++ b/synapse/storage/databases/main/account_data.py
@@ -29,15 +29,13 @@ from synapse.util.caches.stream_change_cache import StreamChangeCache
logger = logging.getLogger(__name__)
-class AccountDataWorkerStore(SQLBaseStore):
+# The ABCMeta metaclass ensures that it cannot be instantiated without
+# the abstract methods being implemented.
+class AccountDataWorkerStore(SQLBaseStore, metaclass=abc.ABCMeta):
"""This is an abstract base class where subclasses must implement
`get_max_account_data_stream_id` which can be called in the initializer.
"""
- # This ABCMeta metaclass ensures that we cannot be instantiated without
- # the abstract methods being implemented.
- __metaclass__ = abc.ABCMeta
-
def __init__(self, database: DatabasePool, db_conn, hs):
account_max = self.get_max_account_data_stream_id()
self._account_data_stream_cache = StreamChangeCache(
diff --git a/synapse/storage/databases/main/push_rule.py b/synapse/storage/databases/main/push_rule.py
index 9790a31998..b7a8d34ce1 100644
--- a/synapse/storage/databases/main/push_rule.py
+++ b/synapse/storage/databases/main/push_rule.py
@@ -61,6 +61,8 @@ def _load_rules(rawrules, enabled_map, use_new_defaults=False):
return rules
+# The ABCMeta metaclass ensures that it cannot be instantiated without
+# the abstract methods being implemented.
class PushRulesWorkerStore(
ApplicationServiceWorkerStore,
ReceiptsWorkerStore,
@@ -68,15 +70,12 @@ class PushRulesWorkerStore(
RoomMemberWorkerStore,
EventsWorkerStore,
SQLBaseStore,
+ metaclass=abc.ABCMeta,
):
"""This is an abstract base class where subclasses must implement
`get_max_push_rules_stream_id` which can be called in the initializer.
"""
- # This ABCMeta metaclass ensures that we cannot be instantiated without
- # the abstract methods being implemented.
- __metaclass__ = abc.ABCMeta
-
def __init__(self, database: DatabasePool, db_conn, hs):
super(PushRulesWorkerStore, self).__init__(database, db_conn, hs)
diff --git a/synapse/storage/databases/main/receipts.py b/synapse/storage/databases/main/receipts.py
index 4a0d5a320e..6568bddd81 100644
--- a/synapse/storage/databases/main/receipts.py
+++ b/synapse/storage/databases/main/receipts.py
@@ -31,15 +31,13 @@ from synapse.util.caches.stream_change_cache import StreamChangeCache
logger = logging.getLogger(__name__)
-class ReceiptsWorkerStore(SQLBaseStore):
+# The ABCMeta metaclass ensures that it cannot be instantiated without
+# the abstract methods being implemented.
+class ReceiptsWorkerStore(SQLBaseStore, metaclass=abc.ABCMeta):
"""This is an abstract base class where subclasses must implement
`get_max_receipt_stream_id` which can be called in the initializer.
"""
- # This ABCMeta metaclass ensures that we cannot be instantiated without
- # the abstract methods being implemented.
- __metaclass__ = abc.ABCMeta
-
def __init__(self, database: DatabasePool, db_conn, hs):
super(ReceiptsWorkerStore, self).__init__(database, db_conn, hs)
diff --git a/synapse/storage/databases/main/stream.py b/synapse/storage/databases/main/stream.py
index 2e95518752..7dbe11513b 100644
--- a/synapse/storage/databases/main/stream.py
+++ b/synapse/storage/databases/main/stream.py
@@ -259,14 +259,12 @@ def filter_to_clause(event_filter: Optional[Filter]) -> Tuple[str, List[str]]:
return " AND ".join(clauses), args
-class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
+class StreamWorkerStore(EventsWorkerStore, SQLBaseStore, metaclass=abc.ABCMeta):
"""This is an abstract base class where subclasses must implement
`get_room_max_stream_ordering` and `get_room_min_stream_ordering`
which can be called in the initializer.
"""
- __metaclass__ = abc.ABCMeta
-
def __init__(self, database: DatabasePool, db_conn, hs: "HomeServer"):
super(StreamWorkerStore, self).__init__(database, db_conn, hs)
diff --git a/synapse/types.py b/synapse/types.py
index dc09448bdc..a6fc7df22c 100644
--- a/synapse/types.py
+++ b/synapse/types.py
@@ -165,7 +165,9 @@ def get_localpart_from_id(string):
DS = TypeVar("DS", bound="DomainSpecificString")
-class DomainSpecificString(namedtuple("DomainSpecificString", ("localpart", "domain"))):
+class DomainSpecificString(
+ namedtuple("DomainSpecificString", ("localpart", "domain")), metaclass=abc.ABCMeta
+):
"""Common base class among ID/name strings that have a local part and a
domain name, prefixed with a sigil.
@@ -175,8 +177,6 @@ class DomainSpecificString(namedtuple("DomainSpecificString", ("localpart", "dom
'domain' : The domain part of the name
"""
- __metaclass__ = abc.ABCMeta
-
SIGIL = abc.abstractproperty() # type: str # type: ignore
# Deny iteration because it will bite you if you try to create a singleton
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