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

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