Use ParamSpec in a few places

changelog.d/12667.misc

@@ -0,0 +1 @@
+Use `ParamSpec` to refine type hints.

synapse/app/_base.py

@@ -38,6 +38,7 @@
 
 from cryptography.utils import CryptographyDeprecationWarning
 from matrix_common.versionstring import get_distribution_version_string
+from typing_extensions import ParamSpec
 
 import twisted
 from twisted.internet import defer, error, reactor as _reactor
@@ -81,19 +82,22 @@
 
 # list of tuples of function, args list, kwargs dict
 _sighup_callbacks: List[
-    Tuple[Callable[..., None], Tuple[Any, ...], Dict[str, Any]]
+    Tuple[Callable[..., None], Tuple[object, ...], Dict[str, object]]
 ] = []
+P = ParamSpec("P")
 
 
-def register_sighup(func: Callable[..., None], *args: Any, **kwargs: Any) -> None:
+def register_sighup(func: Callable[P, None], *args: P.args, **kwargs: P.kwargs) -> None:
     """
     Register a function to be called when a SIGHUP occurs.
 
     Args:
         func: Function to be called when sent a SIGHUP signal.
         *args, **kwargs: args and kwargs to be passed to the target function.
     """
-    _sighup_callbacks.append((func, args, kwargs))
+    # This type-ignore should be redundant once we use a mypy release with
+    # https://github.com/python/mypy/pull/12668.
+    _sighup_callbacks.append((func, args, kwargs))  # type: ignore[arg-type]
 
 
 def start_worker_reactor(
@@ -214,7 +218,9 @@ def redirect_stdio_to_logs() -> None:
     print("Redirected stdout/stderr to logs")
 
 
-def register_start(cb: Callable[..., Awaitable], *args: Any, **kwargs: Any) -> None:
+def register_start(
+    cb: Callable[P, Awaitable], *args: P.args, **kwargs: P.kwargs
+) -> None:
     """Register a callback with the reactor, to be called once it is running
 
     This can be used to initialise parts of the system which require an asynchronous

synapse/events/presence_router.py

@@ -22,9 +22,12 @@
     List,
     Optional,
     Set,
+    TypeVar,
     Union,
 )
 
+from typing_extensions import ParamSpec
+
 from synapse.api.presence import UserPresenceState
 from synapse.util.async_helpers import maybe_awaitable
 
@@ -40,6 +43,10 @@
 logger = logging.getLogger(__name__)
 
 
+P = ParamSpec("P")
+R = TypeVar("R")
+
+
 def load_legacy_presence_router(hs: "HomeServer") -> None:
     """Wrapper that loads a presence router module configured using the old
     configuration, and registers the hooks they implement.
@@ -63,13 +70,15 @@ def load_legacy_presence_router(hs: "HomeServer") -> None:
 
     # All methods that the module provides should be async, but this wasn't enforced
     # in the old module system, so we wrap them if needed
-    def async_wrapper(f: Optional[Callable]) -> Optional[Callable[..., Awaitable]]:
+    def async_wrapper(
+        f: Optional[Callable[P, R]]
+    ) -> Optional[Callable[P, Awaitable[R]]]:
         # f might be None if the callback isn't implemented by the module. In this
         # case we don't want to register a callback at all so we return None.
         if f is None:
             return None
 
-        def run(*args: Any, **kwargs: Any) -> Awaitable:
+        def run(*args: P.args, **kwargs: P.kwargs) -> Awaitable[R]:
             # Assertion required because mypy can't prove we won't change `f`
             # back to `None`. See
             # https://mypy.readthedocs.io/en/latest/common_issues.html#narrowing-and-inner-functions
@@ -80,7 +89,7 @@ def run(*args: Any, **kwargs: Any) -> Awaitable:
         return run
 
     # Register the hooks through the module API.
-    hooks = {
+    hooks: Dict[str, Optional[Callable[..., Any]]] = {
         hook: async_wrapper(getattr(presence_router, hook, None))
         for hook in presence_router_methods
     }

synapse/module_api/__init__.py

@@ -30,6 +30,7 @@
 
 import attr
 import jinja2
+from typing_extensions import ParamSpec
 
 from twisted.internet import defer
 from twisted.web.resource import Resource
@@ -129,6 +130,7 @@
 
 
 T = TypeVar("T")
+P = ParamSpec("P")
 
 """
 This package defines the 'stable' API which can be used by extension modules which
@@ -799,9 +801,9 @@ def invalidate_access_token(
     def run_db_interaction(
         self,
         desc: str,
-        func: Callable[..., T],
-        *args: Any,
-        **kwargs: Any,
+        func: Callable[P, T],
+        *args: P.args,
+        **kwargs: P.kwargs,
     ) -> "defer.Deferred[T]":
         """Run a function with a database connection
 
@@ -817,8 +819,9 @@ def run_db_interaction(
         Returns:
             Deferred[object]: result of func
         """
+        # type-ignore: See https://github.com/python/mypy/issues/8862
         return defer.ensureDeferred(
-            self._store.db_pool.runInteraction(desc, func, *args, **kwargs)
+            self._store.db_pool.runInteraction(desc, func, *args, **kwargs)  # type: ignore[arg-type]
         )
 
     def complete_sso_login(
@@ -1296,9 +1299,9 @@ async def get_room_state(
 
     async def defer_to_thread(
         self,
-        f: Callable[..., T],
-        *args: Any,
-        **kwargs: Any,
+        f: Callable[P, T],
+        *args: P.args,
+        **kwargs: P.kwargs,
     ) -> T:
         """Runs the given function in a separate thread from Synapse's thread pool.
 

synapse/rest/client/knock.py

@@ -15,8 +15,6 @@
 import logging
 from typing import TYPE_CHECKING, Awaitable, Dict, List, Optional, Tuple
 
-from twisted.web.server import Request
-
 from synapse.api.constants import Membership
 from synapse.api.errors import SynapseError
 from synapse.http.server import HttpServer
@@ -97,7 +95,7 @@ async def on_POST(
         return 200, {"room_id": room_id}
 
     def on_PUT(
-        self, request: Request, room_identifier: str, txn_id: str
+        self, request: SynapseRequest, room_identifier: str, txn_id: str
     ) -> Awaitable[Tuple[int, JsonDict]]:
         set_tag("txn_id", txn_id)
 

synapse/rest/client/transactions.py

@@ -15,7 +15,9 @@
 """This module contains logic for storing HTTP PUT transactions. This is used
 to ensure idempotency when performing PUTs using the REST API."""
 import logging
-from typing import TYPE_CHECKING, Any, Awaitable, Callable, Dict, Tuple
+from typing import TYPE_CHECKING, Awaitable, Callable, Dict, Tuple
+
+from typing_extensions import ParamSpec
 
 from twisted.python.failure import Failure
 from twisted.web.server import Request
@@ -32,6 +34,9 @@
 CLEANUP_PERIOD_MS = 1000 * 60 * 30  # 30 mins
 
 
+P = ParamSpec("P")
+
+
 class HttpTransactionCache:
     def __init__(self, hs: "HomeServer"):
         self.hs = hs
@@ -65,9 +70,9 @@ def _get_transaction_key(self, request: Request) -> str:
     def fetch_or_execute_request(
         self,
         request: Request,
-        fn: Callable[..., Awaitable[Tuple[int, JsonDict]]],
-        *args: Any,
-        **kwargs: Any,
+        fn: Callable[P, Awaitable[Tuple[int, JsonDict]]],
+        *args: P.args,
+        **kwargs: P.kwargs,
     ) -> Awaitable[Tuple[int, JsonDict]]:
         """A helper function for fetch_or_execute which extracts
         a transaction key from the given request.
@@ -82,9 +87,9 @@ def fetch_or_execute_request(
     def fetch_or_execute(
         self,
         txn_key: str,
-        fn: Callable[..., Awaitable[Tuple[int, JsonDict]]],
-        *args: Any,
-        **kwargs: Any,
+        fn: Callable[P, Awaitable[Tuple[int, JsonDict]]],
+        *args: P.args,
+        **kwargs: P.kwargs,
     ) -> Awaitable[Tuple[int, JsonDict]]:
         """Fetches the response for this transaction, or executes the given function
         to produce a response for this transaction.

synapse/storage/database.py

@@ -38,7 +38,7 @@
 
 import attr
 from prometheus_client import Histogram
-from typing_extensions import Literal
+from typing_extensions import Concatenate, Literal, ParamSpec
 
 from twisted.enterprise import adbapi
 
@@ -192,9 +192,9 @@ def __getattr__(self, name):
 
 
 # The type of entry which goes on our after_callbacks and exception_callbacks lists.
-_CallbackListEntry = Tuple[Callable[..., object], Iterable[Any], Dict[str, Any]]
-
+_CallbackListEntry = Tuple[Callable[..., object], Tuple[object, ...], Dict[str, object]]
 
+P = ParamSpec("P")
 R = TypeVar("R")
 
 
@@ -239,7 +239,9 @@ def __init__(
         self.after_callbacks = after_callbacks
         self.exception_callbacks = exception_callbacks
 
-    def call_after(self, callback: Callable[..., object], *args: Any, **kwargs: Any):
+    def call_after(
+        self, callback: Callable[P, object], *args: P.args, **kwargs: P.kwargs
+    ) -> None:
         """Call the given callback on the main twisted thread after the transaction has
         finished.
 
@@ -256,11 +258,12 @@ def call_after(self, callback: Callable[..., object], *args: Any, **kwargs: Any)
         # LoggingTransaction isn't expecting there to be any callbacks; assert that
         # is not the case.
         assert self.after_callbacks is not None
-        self.after_callbacks.append((callback, args, kwargs))
+        # type-ignore: need mypy containing https://github.com/python/mypy/pull/12668
+        self.after_callbacks.append((callback, args, kwargs))  # type: ignore[arg-type]
 
     def call_on_exception(
-        self, callback: Callable[..., object], *args: Any, **kwargs: Any
-    ):
+        self, callback: Callable[P, object], *args: P.args, **kwargs: P.kwargs
+    ) -> None:
         """Call the given callback on the main twisted thread after the transaction has
         failed.
 
@@ -274,7 +277,8 @@ def call_on_exception(
         # LoggingTransaction isn't expecting there to be any callbacks; assert that
         # is not the case.
         assert self.exception_callbacks is not None
-        self.exception_callbacks.append((callback, args, kwargs))
+        # type-ignore: need mypy containing https://github.com/python/mypy/pull/12668
+        self.exception_callbacks.append((callback, args, kwargs))  # type: ignore[arg-type]
 
     def fetchone(self) -> Optional[Tuple]:
         return self.txn.fetchone()
@@ -339,7 +343,13 @@ def _make_sql_one_line(self, sql: str) -> str:
         "Strip newlines out of SQL so that the loggers in the DB are on one line"
         return " ".join(line.strip() for line in sql.splitlines() if line.strip())
 
-    def _do_execute(self, func: Callable[..., R], sql: str, *args: Any) -> R:
+    def _do_execute(
+        self,
+        func: Callable[Concatenate[str, P], R],
+        sql: str,
+        *args: P.args,
+        **kwargs: P.kwargs,
+    ) -> R:
         sql = self._make_sql_one_line(sql)
 
         # TODO(paul): Maybe use 'info' and 'debug' for values?
@@ -348,7 +358,10 @@ def _do_execute(self, func: Callable[..., R], sql: str, *args: Any) -> R:
         sql = self.database_engine.convert_param_style(sql)
         if args:
             try:
-                sql_logger.debug("[SQL values] {%s} %r", self.name, args[0])
+                # The type-ignore should be redundant once mypy releases a version with
+                # https://github.com/python/mypy/pull/12668. (`args` might be empty,
+                # (but we'll catch the index error if so.)
+                sql_logger.debug("[SQL values] {%s} %r", self.name, args[0])  # type: ignore[index]
             except Exception:
                 # Don't let logging failures stop SQL from working
                 pass
@@ -363,7 +376,7 @@ def _do_execute(self, func: Callable[..., R], sql: str, *args: Any) -> R:
                     opentracing.tags.DATABASE_STATEMENT: sql,
                 },
             ):
-                return func(sql, *args)
+                return func(sql, *args, **kwargs)
         except Exception as e:
             sql_logger.debug("[SQL FAIL] {%s} %s", self.name, e)
             raise
@@ -540,9 +553,9 @@ def new_transaction(
         desc: str,
         after_callbacks: List[_CallbackListEntry],
         exception_callbacks: List[_CallbackListEntry],
-        func: Callable[..., R],
-        *args: Any,
-        **kwargs: Any,
+        func: Callable[Concatenate[LoggingTransaction, P], R],
+        *args: P.args,
+        **kwargs: P.kwargs,
     ) -> R:
         """Start a new database transaction with the given connection.
 
@@ -572,15 +585,20 @@ def new_transaction(
         # will fail if we have to repeat the transaction.
         # For now, we just log an error, and hope that it works on the first attempt.
         # TODO: raise an exception.
-        for i, arg in enumerate(args):
+
+        # Type-ignore Mypy doesn't yet consider ParamSpec.args to be iterable; see
+        # https://github.com/python/mypy/pull/12668
+        for i, arg in enumerate(args):  # type: ignore[arg-type, var-annotated]
             if inspect.isgenerator(arg):
                 logger.error(
                     "Programming error: generator passed to new_transaction as "
                     "argument %i to function %s",
                     i,
                     func,
                 )
-        for name, val in kwargs.items():
+        # Type-ignore Mypy doesn't yet consider ParamSpec.args to be a mapping; see
+        # https://github.com/python/mypy/pull/12668
+        for name, val in kwargs.items():  # type: ignore[attr-defined]
             if inspect.isgenerator(val):
                 logger.error(
                     "Programming error: generator passed to new_transaction as "

synapse/storage/databases/main/events.py

@@ -1648,9 +1648,15 @@ def prefill():
         txn.call_after(prefill)
 
     def _store_redaction(self, txn: LoggingTransaction, event: EventBase) -> None:
-        # Invalidate the caches for the redacted event, note that these caches
-        # are also cleared as part of event replication in _invalidate_caches_for_event.
-        txn.call_after(self.store._invalidate_get_event_cache, event.redacts)
+        """Invalidate the caches for the redacted event.
+
+        Note that these caches are also cleared as part of event replication in
+        _invalidate_caches_for_event.
+        """
+
+        # type-ignore: mypy detects that event.redacts may be None. Presumably the
+        # application has ensured that this is not the case if we call this function.
+        txn.call_after(self.store._invalidate_get_event_cache, event.redacts)  # type: ignore[arg-type]
         txn.call_after(self.store.get_relations_for_event.invalidate, (event.redacts,))
         txn.call_after(self.store.get_applicable_edit.invalidate, (event.redacts,))