Reduce the number of "untyped defs" (#12716)

6 files changed, 40 insertions, 29 deletions

diff --git a/synapse/http/client.py b/synapse/http/client.py
index b2c9a7c670..084d0a5b84 100644
--- a/synapse/http/client.py
+++ b/synapse/http/client.py
@@ -43,8 +43,10 @@ from twisted.internet import defer, error as twisted_error, protocol, ssl
 from twisted.internet.address import IPv4Address, IPv6Address
 from twisted.internet.interfaces import (
     IAddress,
+    IDelayedCall,
     IHostResolution,
     IReactorPluggableNameResolver,
+    IReactorTime,
     IResolutionReceiver,
     ITCPTransport,
 )
@@ -121,13 +123,15 @@ def check_against_blacklist(
 _EPSILON = 0.00000001
 
 
-def _make_scheduler(reactor):
+def _make_scheduler(
+    reactor: IReactorTime,
+) -> Callable[[Callable[[], object]], IDelayedCall]:
     """Makes a schedular suitable for a Cooperator using the given reactor.
 
     (This is effectively just a copy from `twisted.internet.task`)
     """
 
-    def _scheduler(x):
+    def _scheduler(x: Callable[[], object]) -> IDelayedCall:
         return reactor.callLater(_EPSILON, x)
 
     return _scheduler
@@ -775,7 +779,7 @@ class SimpleHttpClient:
         )
 
 
-def _timeout_to_request_timed_out_error(f: Failure):
+def _timeout_to_request_timed_out_error(f: Failure) -> Failure:
     if f.check(twisted_error.TimeoutError, twisted_error.ConnectingCancelledError):
         # The TCP connection has its own timeout (set by the 'connectTimeout' param
         # on the Agent), which raises twisted_error.TimeoutError exception.
@@ -809,7 +813,7 @@ class _DiscardBodyWithMaxSizeProtocol(protocol.Protocol):
     def __init__(self, deferred: defer.Deferred):
         self.deferred = deferred
 
-    def _maybe_fail(self):
+    def _maybe_fail(self) -> None:
         """
         Report a max size exceed error and disconnect the first time this is called.
         """
@@ -933,12 +937,12 @@ class InsecureInterceptableContextFactory(ssl.ContextFactory):
     Do not use this since it allows an attacker to intercept your communications.
     """
 
-    def __init__(self):
+    def __init__(self) -> None:
         self._context = SSL.Context(SSL.SSLv23_METHOD)
         self._context.set_verify(VERIFY_NONE, lambda *_: False)
 
     def getContext(self, hostname=None, port=None):
         return self._context
 
-    def creatorForNetloc(self, hostname, port):
+    def creatorForNetloc(self, hostname: bytes, port: int):
         return self
diff --git a/synapse/http/federation/matrix_federation_agent.py b/synapse/http/federation/matrix_federation_agent.py
index a8a520f809..2f0177f1e2 100644
--- a/synapse/http/federation/matrix_federation_agent.py
+++ b/synapse/http/federation/matrix_federation_agent.py
@@ -239,7 +239,7 @@ class MatrixHostnameEndpointFactory:
 
         self._srv_resolver = srv_resolver
 
-    def endpointForURI(self, parsed_uri: URI):
+    def endpointForURI(self, parsed_uri: URI) -> "MatrixHostnameEndpoint":
         return MatrixHostnameEndpoint(
             self._reactor,
             self._proxy_reactor,
diff --git a/synapse/http/federation/srv_resolver.py b/synapse/http/federation/srv_resolver.py
index f68646fd0d..de0e882b33 100644
--- a/synapse/http/federation/srv_resolver.py
+++ b/synapse/http/federation/srv_resolver.py
@@ -16,7 +16,7 @@
 import logging
 import random
 import time
-from typing import Callable, Dict, List
+from typing import Any, Callable, Dict, List
 
 import attr
 
@@ -109,7 +109,7 @@ class SrvResolver:
 
     def __init__(
         self,
-        dns_client=client,
+        dns_client: Any = client,
         cache: Dict[bytes, List[Server]] = SERVER_CACHE,
         get_time: Callable[[], float] = time.time,
     ):
diff --git a/synapse/http/federation/well_known_resolver.py b/synapse/http/federation/well_known_resolver.py
index 43f2140429..71b685fade 100644
--- a/synapse/http/federation/well_known_resolver.py
+++ b/synapse/http/federation/well_known_resolver.py
@@ -74,9 +74,9 @@ _well_known_cache: TTLCache[bytes, Optional[bytes]] = TTLCache("well-known")
 _had_valid_well_known_cache: TTLCache[bytes, bool] = TTLCache("had-valid-well-known")
 
 
-@attr.s(slots=True, frozen=True)
+@attr.s(slots=True, frozen=True, auto_attribs=True)
 class WellKnownLookupResult:
-    delegated_server = attr.ib()
+    delegated_server: Optional[bytes]
 
 
 class WellKnownResolver:
@@ -336,4 +336,4 @@ def _parse_cache_control(headers: Headers) -> Dict[bytes, Optional[bytes]]:
 class _FetchWellKnownFailure(Exception):
     # True if we didn't get a non-5xx HTTP response, i.e. this may or may not be
     # a temporary failure.
-    temporary = attr.ib()
+    temporary: bool = attr.ib()
diff --git a/synapse/http/matrixfederationclient.py b/synapse/http/matrixfederationclient.py
index c2ec3caa0e..725b5c33b8 100644
--- a/synapse/http/matrixfederationclient.py
+++ b/synapse/http/matrixfederationclient.py
@@ -23,6 +23,8 @@ from http import HTTPStatus
 from io import BytesIO, StringIO
 from typing import (
     TYPE_CHECKING,
+    Any,
+    BinaryIO,
     Callable,
     Dict,
     Generic,
@@ -44,7 +46,7 @@ from typing_extensions import Literal
 from twisted.internet import defer
 from twisted.internet.error import DNSLookupError
 from twisted.internet.interfaces import IReactorTime
-from twisted.internet.task import _EPSILON, Cooperator
+from twisted.internet.task import Cooperator
 from twisted.web.client import ResponseFailed
 from twisted.web.http_headers import Headers
 from twisted.web.iweb import IBodyProducer, IResponse
@@ -58,11 +60,13 @@ from synapse.api.errors import (
     RequestSendFailed,
     SynapseError,
 )
+from synapse.crypto.context_factory import FederationPolicyForHTTPS
 from synapse.http import QuieterFileBodyProducer
 from synapse.http.client import (
     BlacklistingAgentWrapper,
     BodyExceededMaxSize,
     ByteWriteable,
+    _make_scheduler,
     encode_query_args,
     read_body_with_max_size,
 )
@@ -181,7 +185,7 @@ class JsonParser(ByteParser[Union[JsonDict, list]]):
 
     CONTENT_TYPE = "application/json"
 
-    def __init__(self):
+    def __init__(self) -> None:
         self._buffer = StringIO()
         self._binary_wrapper = BinaryIOWrapper(self._buffer)
 
@@ -299,7 +303,9 @@ async def _handle_response(
 class BinaryIOWrapper:
     """A wrapper for a TextIO which converts from bytes on the fly."""
 
-    def __init__(self, file: typing.TextIO, encoding="utf-8", errors="strict"):
+    def __init__(
+        self, file: typing.TextIO, encoding: str = "utf-8", errors: str = "strict"
+    ):
         self.decoder = codecs.getincrementaldecoder(encoding)(errors)
         self.file = file
 
@@ -317,7 +323,11 @@ class MatrixFederationHttpClient:
             requests.
     """
 
-    def __init__(self, hs: "HomeServer", tls_client_options_factory):
+    def __init__(
+        self,
+        hs: "HomeServer",
+        tls_client_options_factory: Optional[FederationPolicyForHTTPS],
+    ):
         self.hs = hs
         self.signing_key = hs.signing_key
         self.server_name = hs.hostname
@@ -348,10 +358,7 @@ class MatrixFederationHttpClient:
         self.version_string_bytes = hs.version_string.encode("ascii")
         self.default_timeout = 60
 
-        def schedule(x):
-            self.reactor.callLater(_EPSILON, x)
-
-        self._cooperator = Cooperator(scheduler=schedule)
+        self._cooperator = Cooperator(scheduler=_make_scheduler(self.reactor))
 
         self._sleeper = AwakenableSleeper(self.reactor)
 
@@ -364,7 +371,7 @@ class MatrixFederationHttpClient:
         self,
         request: MatrixFederationRequest,
         try_trailing_slash_on_400: bool = False,
-        **send_request_args,
+        **send_request_args: Any,
     ) -> IResponse:
         """Wrapper for _send_request which can optionally retry the request
         upon receiving a combination of a 400 HTTP response code and a
@@ -1159,7 +1166,7 @@ class MatrixFederationHttpClient:
         self,
         destination: str,
         path: str,
-        output_stream,
+        output_stream: BinaryIO,
         args: Optional[QueryParams] = None,
         retry_on_dns_fail: bool = True,
         max_size: Optional[int] = None,
@@ -1250,10 +1257,10 @@ class MatrixFederationHttpClient:
         return length, headers
 
 
-def _flatten_response_never_received(e):
+def _flatten_response_never_received(e: BaseException) -> str:
     if hasattr(e, "reasons"):
         reasons = ", ".join(
-            _flatten_response_never_received(f.value) for f in e.reasons
+            _flatten_response_never_received(f.value) for f in e.reasons  # type: ignore[attr-defined]
         )
 
         return "%s:[%s]" % (type(e).__name__, reasons)
diff --git a/synapse/http/request_metrics.py b/synapse/http/request_metrics.py
index 4886626d50..2b6d113544 100644
--- a/synapse/http/request_metrics.py
+++ b/synapse/http/request_metrics.py
@@ -162,7 +162,7 @@ class RequestMetrics:
         with _in_flight_requests_lock:
             _in_flight_requests.add(self)
 
-    def stop(self, time_sec, response_code, sent_bytes):
+    def stop(self, time_sec: float, response_code: int, sent_bytes: int) -> None:
         with _in_flight_requests_lock:
             _in_flight_requests.discard(self)
 
@@ -186,13 +186,13 @@ class RequestMetrics:
             )
             return
 
-        response_code = str(response_code)
+        response_code_str = str(response_code)
 
-        outgoing_responses_counter.labels(self.method, response_code).inc()
+        outgoing_responses_counter.labels(self.method, response_code_str).inc()
 
         response_count.labels(self.method, self.name, tag).inc()
 
-        response_timer.labels(self.method, self.name, tag, response_code).observe(
+        response_timer.labels(self.method, self.name, tag, response_code_str).observe(
             time_sec - self.start_ts
         )
 
@@ -221,7 +221,7 @@ class RequestMetrics:
         # flight.
         self.update_metrics()
 
-    def update_metrics(self):
+    def update_metrics(self) -> None:
         """Updates the in flight metrics with values from this request."""
         if not self.start_context:
             logger.error(