Fixup synapse.replication to pass mypy checks (#6667)

10 files changed, 103 insertions, 86 deletions

diff --git a/synapse/replication/http/_base.py b/synapse/replication/http/_base.py
index c8056b0c0c..444eb7b7f4 100644
--- a/synapse/replication/http/_base.py
+++ b/synapse/replication/http/_base.py
@@ -16,6 +16,7 @@
 import abc
 import logging
 import re
+from typing import Dict, List, Tuple
 
 from six import raise_from
 from six.moves import urllib
@@ -78,9 +79,8 @@ class ReplicationEndpoint(object):
 
     __metaclass__ = abc.ABCMeta
 
-    NAME = abc.abstractproperty()
-    PATH_ARGS = abc.abstractproperty()
-
+    NAME = abc.abstractproperty()  # type: str  # type: ignore
+    PATH_ARGS = abc.abstractproperty()  # type: Tuple[str, ...]  # type: ignore
     METHOD = "POST"
     CACHE = True
     RETRY_ON_TIMEOUT = True
@@ -171,7 +171,7 @@ class ReplicationEndpoint(object):
                 # have a good idea that the request has either succeeded or failed on
                 # the master, and so whether we should clean up or not.
                 while True:
-                    headers = {}
+                    headers = {}  # type: Dict[bytes, List[bytes]]
                     inject_active_span_byte_dict(headers, None, check_destination=False)
                     try:
                         result = yield request_func(uri, data, headers=headers)
@@ -207,7 +207,7 @@ class ReplicationEndpoint(object):
         method = self.METHOD
 
         if self.CACHE:
-            handler = self._cached_handler
+            handler = self._cached_handler  # type: ignore
             url_args.append("txn_id")
 
         args = "/".join("(?P<%s>[^/]+)" % (arg,) for arg in url_args)
diff --git a/synapse/replication/slave/storage/_base.py b/synapse/replication/slave/storage/_base.py
index b91a528245..704282c800 100644
--- a/synapse/replication/slave/storage/_base.py
+++ b/synapse/replication/slave/storage/_base.py
@@ -14,7 +14,7 @@
 # limitations under the License.
 
 import logging
-from typing import Dict
+from typing import Dict, Optional
 
 import six
 
@@ -41,7 +41,7 @@ class BaseSlavedStore(SQLBaseStore):
         if isinstance(self.database_engine, PostgresEngine):
             self._cache_id_gen = SlavedIdTracker(
                 db_conn, "cache_invalidation_stream", "stream_id"
-            )
+            )  # type: Optional[SlavedIdTracker]
         else:
             self._cache_id_gen = None
 
@@ -62,7 +62,8 @@ class BaseSlavedStore(SQLBaseStore):
 
     def process_replication_rows(self, stream_name, token, rows):
         if stream_name == "caches":
-            self._cache_id_gen.advance(token)
+            if self._cache_id_gen:
+                self._cache_id_gen.advance(token)
             for row in rows:
                 if row.cache_func == CURRENT_STATE_CACHE_NAME:
                     room_id = row.keys[0]
diff --git a/synapse/replication/slave/storage/presence.py b/synapse/replication/slave/storage/presence.py
index f552e7c972..ad8f0c15a9 100644
--- a/synapse/replication/slave/storage/presence.py
+++ b/synapse/replication/slave/storage/presence.py
@@ -29,7 +29,7 @@ class SlavedPresenceStore(BaseSlavedStore):
 
         self._presence_on_startup = self._get_active_presence(db_conn)
 
-        self.presence_stream_cache = self.presence_stream_cache = StreamChangeCache(
+        self.presence_stream_cache = StreamChangeCache(
             "PresenceStreamChangeCache", self._presence_id_gen.get_current_token()
         )
 
diff --git a/synapse/replication/tcp/client.py b/synapse/replication/tcp/client.py
index bbcb84646c..aa7fd90e26 100644
--- a/synapse/replication/tcp/client.py
+++ b/synapse/replication/tcp/client.py
@@ -16,7 +16,7 @@
 """
 
 import logging
-from typing import Dict
+from typing import Dict, List, Optional
 
 from twisted.internet import defer
 from twisted.internet.protocol import ReconnectingClientFactory
@@ -28,6 +28,7 @@ from synapse.replication.tcp.protocol import (
 )
 
 from .commands import (
+    Command,
     FederationAckCommand,
     InvalidateCacheCommand,
     RemovePusherCommand,
@@ -89,15 +90,15 @@ class ReplicationClientHandler(AbstractReplicationClientHandler):
 
         # Any pending commands to be sent once a new connection has been
         # established
-        self.pending_commands = []
+        self.pending_commands = []  # type: List[Command]
 
         # Map from string -> deferred, to wake up when receiveing a SYNC with
         # the given string.
         # Used for tests.
-        self.awaiting_syncs = {}
+        self.awaiting_syncs = {}  # type: Dict[str, defer.Deferred]
 
         # The factory used to create connections.
-        self.factory = None
+        self.factory = None  # type: Optional[ReplicationClientFactory]
 
     def start_replication(self, hs):
         """Helper method to start a replication connection to the remote server
@@ -235,4 +236,5 @@ class ReplicationClientHandler(AbstractReplicationClientHandler):
         # We don't reset the delay any earlier as otherwise if there is a
         # problem during start up we'll end up tight looping connecting to the
         # server.
-        self.factory.resetDelay()
+        if self.factory:
+            self.factory.resetDelay()
diff --git a/synapse/replication/tcp/commands.py b/synapse/replication/tcp/commands.py
index 0ff2a7199f..cbb36b9acf 100644
--- a/synapse/replication/tcp/commands.py
+++ b/synapse/replication/tcp/commands.py
@@ -20,15 +20,16 @@ allowed to be sent by which side.
 
 import logging
 import platform
+from typing import Tuple, Type
 
 if platform.python_implementation() == "PyPy":
     import json
 
     _json_encoder = json.JSONEncoder()
 else:
-    import simplejson as json
+    import simplejson as json  # type: ignore[no-redef]  # noqa: F821
 
-    _json_encoder = json.JSONEncoder(namedtuple_as_object=False)
+    _json_encoder = json.JSONEncoder(namedtuple_as_object=False)  # type: ignore[call-arg]  # noqa: F821
 
 logger = logging.getLogger(__name__)
 
@@ -44,7 +45,7 @@ class Command(object):
     The default implementation creates a command of form `<NAME> <data>`
     """
 
-    NAME = None
+    NAME = None  # type: str
 
     def __init__(self, data):
         self.data = data
@@ -386,25 +387,24 @@ class UserIpCommand(Command):
         )
 
 
+_COMMANDS = (
+    ServerCommand,
+    RdataCommand,
+    PositionCommand,
+    ErrorCommand,
+    PingCommand,
+    NameCommand,
+    ReplicateCommand,
+    UserSyncCommand,
+    FederationAckCommand,
+    SyncCommand,
+    RemovePusherCommand,
+    InvalidateCacheCommand,
+    UserIpCommand,
+)  # type: Tuple[Type[Command], ...]
+
 # Map of command name to command type.
-COMMAND_MAP = {
-    cmd.NAME: cmd
-    for cmd in (
-        ServerCommand,
-        RdataCommand,
-        PositionCommand,
-        ErrorCommand,
-        PingCommand,
-        NameCommand,
-        ReplicateCommand,
-        UserSyncCommand,
-        FederationAckCommand,
-        SyncCommand,
-        RemovePusherCommand,
-        InvalidateCacheCommand,
-        UserIpCommand,
-    )
-}
+COMMAND_MAP = {cmd.NAME: cmd for cmd in _COMMANDS}
 
 # The commands the server is allowed to send
 VALID_SERVER_COMMANDS = (
diff --git a/synapse/replication/tcp/protocol.py b/synapse/replication/tcp/protocol.py
index afaf002fe6..db0353c996 100644
--- a/synapse/replication/tcp/protocol.py
+++ b/synapse/replication/tcp/protocol.py
@@ -53,6 +53,7 @@ import fcntl
 import logging
 import struct
 from collections import defaultdict
+from typing import Any, DefaultDict, Dict, List, Set, Tuple
 
 from six import iteritems, iterkeys
 
@@ -65,13 +66,11 @@ from twisted.python.failure import Failure
 from synapse.logging.context import make_deferred_yieldable, run_in_background
 from synapse.metrics import LaterGauge
 from synapse.metrics.background_process_metrics import run_as_background_process
-from synapse.util import Clock
-from synapse.util.stringutils import random_string
-
-from .commands import (
+from synapse.replication.tcp.commands import (
     COMMAND_MAP,
     VALID_CLIENT_COMMANDS,
     VALID_SERVER_COMMANDS,
+    Command,
     ErrorCommand,
     NameCommand,
     PingCommand,
@@ -82,6 +81,10 @@ from .commands import (
     SyncCommand,
     UserSyncCommand,
 )
+from synapse.types import Collection
+from synapse.util import Clock
+from synapse.util.stringutils import random_string
+
 from .streams import STREAMS_MAP
 
 connection_close_counter = Counter(
@@ -124,8 +127,11 @@ class BaseReplicationStreamProtocol(LineOnlyReceiver):
 
     delimiter = b"\n"
 
-    VALID_INBOUND_COMMANDS = []  # Valid commands we expect to receive
-    VALID_OUTBOUND_COMMANDS = []  # Valid commans we can send
+    # Valid commands we expect to receive
+    VALID_INBOUND_COMMANDS = []  # type: Collection[str]
+
+    # Valid commands we can send
+    VALID_OUTBOUND_COMMANDS = []  # type: Collection[str]
 
     max_line_buffer = 10000
 
@@ -144,13 +150,13 @@ class BaseReplicationStreamProtocol(LineOnlyReceiver):
         self.conn_id = random_string(5)  # To dedupe in case of name clashes.
 
         # List of pending commands to send once we've established the connection
-        self.pending_commands = []
+        self.pending_commands = []  # type: List[Command]
 
         # The LoopingCall for sending pings.
         self._send_ping_loop = None
 
-        self.inbound_commands_counter = defaultdict(int)
-        self.outbound_commands_counter = defaultdict(int)
+        self.inbound_commands_counter = defaultdict(int)  # type: DefaultDict[str, int]
+        self.outbound_commands_counter = defaultdict(int)  # type: DefaultDict[str, int]
 
     def connectionMade(self):
         logger.info("[%s] Connection established", self.id())
@@ -409,14 +415,14 @@ class ServerReplicationStreamProtocol(BaseReplicationStreamProtocol):
         self.streamer = streamer
 
         # The streams the client has subscribed to and is up to date with
-        self.replication_streams = set()
+        self.replication_streams = set()  # type: Set[str]
 
         # The streams the client is currently subscribing to.
-        self.connecting_streams = set()
+        self.connecting_streams = set()  # type:  Set[str]
 
         # Map from stream name to list of updates to send once we've finished
         # subscribing the client to the stream.
-        self.pending_rdata = {}
+        self.pending_rdata = {}  # type: Dict[str, List[Tuple[int, Any]]]
 
     def connectionMade(self):
         self.send_command(ServerCommand(self.server_name))
@@ -642,11 +648,11 @@ class ClientReplicationStreamProtocol(BaseReplicationStreamProtocol):
         # Set of stream names that have been subscribe to, but haven't yet
         # caught up with. This is used to track when the client has been fully
         # connected to the remote.
-        self.streams_connecting = set()
+        self.streams_connecting = set()  # type: Set[str]
 
         # Map of stream to batched updates. See RdataCommand for info on how
         # batching works.
-        self.pending_batches = {}
+        self.pending_batches = {}  # type: Dict[str, Any]
 
     def connectionMade(self):
         self.send_command(NameCommand(self.client_name))
@@ -766,7 +772,7 @@ def transport_kernel_read_buffer_size(protocol, read=True):
             op = SIOCINQ
         else:
             op = SIOCOUTQ
-        size = struct.unpack("I", fcntl.ioctl(fileno, op, "\0\0\0\0"))[0]
+        size = struct.unpack("I", fcntl.ioctl(fileno, op, b"\0\0\0\0"))[0]
         return size
     return 0
 
diff --git a/synapse/replication/tcp/resource.py b/synapse/replication/tcp/resource.py
index d1e98428bc..cbfdaf5773 100644
--- a/synapse/replication/tcp/resource.py
+++ b/synapse/replication/tcp/resource.py
@@ -17,6 +17,7 @@
 
 import logging
 import random
+from typing import List
 
 from six import itervalues
 
@@ -79,7 +80,7 @@ class ReplicationStreamer(object):
         self._replication_torture_level = hs.config.replication_torture_level
 
         # Current connections.
-        self.connections = []
+        self.connections = []  # type: List[ServerReplicationStreamProtocol]
 
         LaterGauge(
             "synapse_replication_tcp_resource_total_connections",
diff --git a/synapse/replication/tcp/streams/_base.py b/synapse/replication/tcp/streams/_base.py
index 8512923eae..4ab0334fc1 100644
--- a/synapse/replication/tcp/streams/_base.py
+++ b/synapse/replication/tcp/streams/_base.py
@@ -14,10 +14,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-
 import itertools
 import logging
 from collections import namedtuple
+from typing import Any
 
 from twisted.internet import defer
 
@@ -104,8 +104,9 @@ class Stream(object):
     time it was called up until the point `advance_current_token` was called.
     """
 
-    NAME = None  # The name of the stream
-    ROW_TYPE = None  # The type of the row. Used by the default impl of parse_row.
+    NAME = None  # type: str  # The name of the stream
+    # The type of the row. Used by the default impl of parse_row.
+    ROW_TYPE = None  # type: Any
     _LIMITED = True  # Whether the update function takes a limit
 
     @classmethod
@@ -231,8 +232,8 @@ class BackfillStream(Stream):
 
     def __init__(self, hs):
         store = hs.get_datastore()
-        self.current_token = store.get_current_backfill_token
-        self.update_function = store.get_all_new_backfill_event_rows
+        self.current_token = store.get_current_backfill_token  # type: ignore
+        self.update_function = store.get_all_new_backfill_event_rows  # type: ignore
 
         super(BackfillStream, self).__init__(hs)
 
@@ -246,8 +247,8 @@ class PresenceStream(Stream):
         store = hs.get_datastore()
         presence_handler = hs.get_presence_handler()
 
-        self.current_token = store.get_current_presence_token
-        self.update_function = presence_handler.get_all_presence_updates
+        self.current_token = store.get_current_presence_token  # type: ignore
+        self.update_function = presence_handler.get_all_presence_updates  # type: ignore
 
         super(PresenceStream, self).__init__(hs)
 
@@ -260,8 +261,8 @@ class TypingStream(Stream):
     def __init__(self, hs):
         typing_handler = hs.get_typing_handler()
 
-        self.current_token = typing_handler.get_current_token
-        self.update_function = typing_handler.get_all_typing_updates
+        self.current_token = typing_handler.get_current_token  # type: ignore
+        self.update_function = typing_handler.get_all_typing_updates  # type: ignore
 
         super(TypingStream, self).__init__(hs)
 
@@ -273,8 +274,8 @@ class ReceiptsStream(Stream):
     def __init__(self, hs):
         store = hs.get_datastore()
 
-        self.current_token = store.get_max_receipt_stream_id
-        self.update_function = store.get_all_updated_receipts
+        self.current_token = store.get_max_receipt_stream_id  # type: ignore
+        self.update_function = store.get_all_updated_receipts  # type: ignore
 
         super(ReceiptsStream, self).__init__(hs)
 
@@ -310,8 +311,8 @@ class PushersStream(Stream):
     def __init__(self, hs):
         store = hs.get_datastore()
 
-        self.current_token = store.get_pushers_stream_token
-        self.update_function = store.get_all_updated_pushers_rows
+        self.current_token = store.get_pushers_stream_token  # type: ignore
+        self.update_function = store.get_all_updated_pushers_rows  # type: ignore
 
         super(PushersStream, self).__init__(hs)
 
@@ -327,8 +328,8 @@ class CachesStream(Stream):
     def __init__(self, hs):
         store = hs.get_datastore()
 
-        self.current_token = store.get_cache_stream_token
-        self.update_function = store.get_all_updated_caches
+        self.current_token = store.get_cache_stream_token  # type: ignore
+        self.update_function = store.get_all_updated_caches  # type: ignore
 
         super(CachesStream, self).__init__(hs)
 
@@ -343,8 +344,8 @@ class PublicRoomsStream(Stream):
     def __init__(self, hs):
         store = hs.get_datastore()
 
-        self.current_token = store.get_current_public_room_stream_id
-        self.update_function = store.get_all_new_public_rooms
+        self.current_token = store.get_current_public_room_stream_id  # type: ignore
+        self.update_function = store.get_all_new_public_rooms  # type: ignore
 
         super(PublicRoomsStream, self).__init__(hs)
 
@@ -360,8 +361,8 @@ class DeviceListsStream(Stream):
     def __init__(self, hs):
         store = hs.get_datastore()
 
-        self.current_token = store.get_device_stream_token
-        self.update_function = store.get_all_device_list_changes_for_remotes
+        self.current_token = store.get_device_stream_token  # type: ignore
+        self.update_function = store.get_all_device_list_changes_for_remotes  # type: ignore
 
         super(DeviceListsStream, self).__init__(hs)
 
@@ -376,8 +377,8 @@ class ToDeviceStream(Stream):
     def __init__(self, hs):
         store = hs.get_datastore()
 
-        self.current_token = store.get_to_device_stream_token
-        self.update_function = store.get_all_new_device_messages
+        self.current_token = store.get_to_device_stream_token  # type: ignore
+        self.update_function = store.get_all_new_device_messages  # type: ignore
 
         super(ToDeviceStream, self).__init__(hs)
 
@@ -392,8 +393,8 @@ class TagAccountDataStream(Stream):
     def __init__(self, hs):
         store = hs.get_datastore()
 
-        self.current_token = store.get_max_account_data_stream_id
-        self.update_function = store.get_all_updated_tags
+        self.current_token = store.get_max_account_data_stream_id  # type: ignore
+        self.update_function = store.get_all_updated_tags  # type: ignore
 
         super(TagAccountDataStream, self).__init__(hs)
 
@@ -408,7 +409,7 @@ class AccountDataStream(Stream):
     def __init__(self, hs):
         self.store = hs.get_datastore()
 
-        self.current_token = self.store.get_max_account_data_stream_id
+        self.current_token = self.store.get_max_account_data_stream_id  # type: ignore
 
         super(AccountDataStream, self).__init__(hs)
 
@@ -434,8 +435,8 @@ class GroupServerStream(Stream):
     def __init__(self, hs):
         store = hs.get_datastore()
 
-        self.current_token = store.get_group_stream_token
-        self.update_function = store.get_all_groups_changes
+        self.current_token = store.get_group_stream_token  # type: ignore
+        self.update_function = store.get_all_groups_changes  # type: ignore
 
         super(GroupServerStream, self).__init__(hs)
 
@@ -451,7 +452,7 @@ class UserSignatureStream(Stream):
     def __init__(self, hs):
         store = hs.get_datastore()
 
-        self.current_token = store.get_device_stream_token
-        self.update_function = store.get_all_user_signature_changes_for_remotes
+        self.current_token = store.get_device_stream_token  # type: ignore
+        self.update_function = store.get_all_user_signature_changes_for_remotes  # type: ignore
 
         super(UserSignatureStream, self).__init__(hs)
diff --git a/synapse/replication/tcp/streams/events.py b/synapse/replication/tcp/streams/events.py
index d97669c886..0843e5aa90 100644
--- a/synapse/replication/tcp/streams/events.py
+++ b/synapse/replication/tcp/streams/events.py
@@ -13,7 +13,9 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
 import heapq
+from typing import Tuple, Type
 
 import attr
 
@@ -63,7 +65,8 @@ class BaseEventsStreamRow(object):
     Specifies how to identify, serialize and deserialize the different types.
     """
 
-    TypeId = None  # Unique string that ids the type. Must be overriden in sub classes.
+    # Unique string that ids the type. Must be overriden in sub classes.
+    TypeId = None  # type: str
 
     @classmethod
     def from_data(cls, data):
@@ -99,9 +102,12 @@ class EventsStreamCurrentStateRow(BaseEventsStreamRow):
     event_id = attr.ib()  # str, optional
 
 
-TypeToRow = {
-    Row.TypeId: Row for Row in (EventsStreamEventRow, EventsStreamCurrentStateRow)
-}
+_EventRows = (
+    EventsStreamEventRow,
+    EventsStreamCurrentStateRow,
+)  # type: Tuple[Type[BaseEventsStreamRow], ...]
+
+TypeToRow = {Row.TypeId: Row for Row in _EventRows}
 
 
 class EventsStream(Stream):
@@ -112,7 +118,7 @@ class EventsStream(Stream):
 
     def __init__(self, hs):
         self._store = hs.get_datastore()
-        self.current_token = self._store.get_current_events_token
+        self.current_token = self._store.get_current_events_token  # type: ignore
 
         super(EventsStream, self).__init__(hs)
 
diff --git a/synapse/replication/tcp/streams/federation.py b/synapse/replication/tcp/streams/federation.py
index dc2484109d..615f3dc9ac 100644
--- a/synapse/replication/tcp/streams/federation.py
+++ b/synapse/replication/tcp/streams/federation.py
@@ -37,7 +37,7 @@ class FederationStream(Stream):
     def __init__(self, hs):
         federation_sender = hs.get_federation_sender()
 
-        self.current_token = federation_sender.get_current_token
-        self.update_function = federation_sender.get_replication_rows
+        self.current_token = federation_sender.get_current_token  # type: ignore
+        self.update_function = federation_sender.get_replication_rows  # type: ignore
 
         super(FederationStream, self).__init__(hs)