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Use ParamSpec in a few places (#12667)

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David Robertson 2022-05-09 11:27:39 +01:00 committed by GitHub
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14 changed files with 148 additions and 68 deletions
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1
changelog.d/12667.misc Normal file
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@ -0,0 +1 @@
Use `ParamSpec` to refine type hints.

2
poetry.lock generated
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@ -1563,7 +1563,7 @@ url_preview = ["lxml"]
[metadata]
lock-version = "1.1"
python-versions = "^3.7.1"
content-hash = "eebc9e1d720e2e866f5fddda98ce83d858949a6fdbe30c7e5aef4cf9d17be498"
content-hash = "d39d5ac5d51c014581186b7691999b861058b569084c525523baf70b77f292b1"
[metadata.files]
attrs = [

4
pyproject.toml
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@ -143,7 +143,9 @@ netaddr = ">=0.7.18"
Jinja2 = ">=3.0"
bleach = ">=1.4.3"
# We use `ParamSpec` and `Concatenate`, which were added in `typing-extensions` 3.10.0.0.
typing-extensions = ">=3.10.0"
# Additionally we need https://github.com/python/typing/pull/817 to allow types to be
# generic over ParamSpecs.
typing-extensions = ">=3.10.0.1"
# We enforce that we have a `cryptography` version that bundles an `openssl`
# with the latest security patches.
cryptography = ">=3.4.7"

14
synapse/app/_base.py
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@ -38,6 +38,7 @@ from typing import (
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
@ -81,11 +82,12 @@ logger = logging.getLogger(__name__)
# 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.
@ -93,7 +95,9 @@ def register_sighup(func: Callable[..., None], *args: Any, **kwargs: Any) -> Non
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

15
synapse/events/presence_router.py
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@ -22,9 +22,12 @@ from typing import (
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 @@ GET_INTERESTED_USERS_CALLBACK = Callable[[str], Awaitable[Union[Set[str], str]]]
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 load_legacy_presence_router(hs: "HomeServer") -> None:
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
}

17
synapse/module_api/__init__.py
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@ -30,6 +30,7 @@ from typing import (
import attr
import jinja2
from typing_extensions import ParamSpec
from twisted.internet import defer
from twisted.web.resource import Resource
@ -129,6 +130,7 @@ if TYPE_CHECKING:
T = TypeVar("T")
P = ParamSpec("P")
"""
This package defines the 'stable' API which can be used by extension modules which
@ -799,9 +801,9 @@ class ModuleApi:
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 @@ class ModuleApi:
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 @@ class ModuleApi:
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.

4
synapse/rest/client/knock.py
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@ -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 @@ class KnockRoomAliasServlet(RestServlet):
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)

19
synapse/rest/client/transactions.py
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@ -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 @@ logger = logging.getLogger(__name__)
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 @@ class HttpTransactionCache:
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 @@ class HttpTransactionCache:
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.

31
synapse/storage/database.py
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@ -192,7 +192,7 @@ class LoggingDatabaseConnection:
# 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 @@ class LoggingTransaction:
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 @@ class LoggingTransaction:
# 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 @@ class LoggingTransaction:
# 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()
@ -549,9 +553,9 @@ class DatabasePool:
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.
@ -581,7 +585,10 @@ class DatabasePool:
# 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 "
@ -589,7 +596,9 @@ class DatabasePool:
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 "

8
synapse/storage/databases/main/events.py
View file

@ -1648,8 +1648,12 @@ class PersistEventsStore:
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.
"""Invalidate the caches for the redacted event.
Note that these caches are also cleared as part of event replication in
_invalidate_caches_for_event.
"""
assert event.redacts is not None
txn.call_after(self.store._invalidate_get_event_cache, event.redacts)
txn.call_after(self.store.get_relations_for_event.invalidate, (event.redacts,))
txn.call_after(self.store.get_applicable_edit.invalidate, (event.redacts,))

26
synapse/util/async_helpers.py
View file

@ -42,7 +42,7 @@ from typing import (
)
import attr
from typing_extensions import AsyncContextManager, Literal
from typing_extensions import AsyncContextManager, Concatenate, Literal, ParamSpec
from twisted.internet import defer
from twisted.internet.defer import CancelledError
@ -237,9 +237,16 @@ async def concurrently_execute(
)
P = ParamSpec("P")
R = TypeVar("R")
async def yieldable_gather_results(
func: Callable[..., Awaitable[T]], iter: Iterable, *args: Any, **kwargs: Any
) -> List[T]:
func: Callable[Concatenate[T, P], Awaitable[R]],
iter: Iterable[T],
*args: P.args,
**kwargs: P.kwargs,
) -> List[R]:
"""Executes the function with each argument concurrently.
Args:
@ -255,7 +262,15 @@ async def yieldable_gather_results(
try:
return await make_deferred_yieldable(
defer.gatherResults(
[run_in_background(func, item, *args, **kwargs) for item in iter],
# type-ignore: mypy reports two errors:
# error: Argument 1 to "run_in_background" has incompatible type
# "Callable[[T, **P], Awaitable[R]]"; expected
# "Callable[[T, **P], Awaitable[R]]" [arg-type]
# error: Argument 2 to "run_in_background" has incompatible type
# "T"; expected "[T, **P.args]" [arg-type]
# The former looks like a mypy bug, and the latter looks like a
# false positive.
[run_in_background(func, item, *args, **kwargs) for item in iter], # type: ignore[arg-type]
consumeErrors=True,
)
)
@ -577,9 +592,6 @@ class ReadWriteLock:
return _ctx_manager()
R = TypeVar("R")
def timeout_deferred(
deferred: "defer.Deferred[_T]", timeout: float, reactor: IReactorTime
) -> "defer.Deferred[_T]":

29
synapse/util/distributor.py
View file

@ -12,7 +12,19 @@
# See the License for the specific language governing permissions and
# limitations under the License.
import logging
from typing import Any, Callable, Dict, List
from typing import (
Any,
Awaitable,
Callable,
Dict,
Generic,
List,
Optional,
TypeVar,
Union,
)
from typing_extensions import ParamSpec
from twisted.internet import defer
@ -75,7 +87,11 @@ class Distributor:
run_as_background_process(name, self.signals[name].fire, *args, **kwargs)
class Signal:
P = ParamSpec("P")
R = TypeVar("R")
class Signal(Generic[P]):
"""A Signal is a dispatch point that stores a list of callables as
observers of it.
@ -87,16 +103,16 @@ class Signal:
def __init__(self, name: str):
self.name: str = name
self.observers: List[Callable] = []
self.observers: List[Callable[P, Any]] = []
def observe(self, observer: Callable) -> None:
def observe(self, observer: Callable[P, Any]) -> None:
"""Adds a new callable to the observer list which will be invoked by
the 'fire' method.
Each observer callable may return a Deferred."""
self.observers.append(observer)
def fire(self, *args: Any, **kwargs: Any) -> "defer.Deferred[List[Any]]":
def fire(self, *args: P.args, **kwargs: P.kwargs) -> "defer.Deferred[List[Any]]":
"""Invokes every callable in the observer list, passing in the args and
kwargs. Exceptions thrown by observers are logged but ignored. It is
not an error to fire a signal with no observers.
@ -104,7 +120,7 @@ class Signal:
Returns a Deferred that will complete when all the observers have
completed."""
async def do(observer: Callable[..., Any]) -> Any:
async def do(observer: Callable[P, Union[R, Awaitable[R]]]) -> Optional[R]:
try:
return await maybe_awaitable(observer(*args, **kwargs))
except Exception as e:
@ -114,6 +130,7 @@ class Signal:
observer,
e,
)
return None
deferreds = [run_in_background(do, o) for o in self.observers]

31
synapse/util/metrics.py
View file

@ -15,10 +15,10 @@
import logging
from functools import wraps
from types import TracebackType
from typing import Any, Callable, Optional, Type, TypeVar, cast
from typing import Awaitable, Callable, Optional, Type, TypeVar
from prometheus_client import Counter
from typing_extensions import Protocol
from typing_extensions import Concatenate, ParamSpec, Protocol
from synapse.logging.context import (
ContextResourceUsage,
@ -72,16 +72,21 @@ in_flight: InFlightGauge[_InFlightMetric] = InFlightGauge(
)
T = TypeVar("T", bound=Callable[..., Any])
P = ParamSpec("P")
R = TypeVar("R")
class HasClock(Protocol):
clock: Clock
def measure_func(name: Optional[str] = None) -> Callable[[T], T]:
"""
Used to decorate an async function with a `Measure` context manager.
def measure_func(
name: Optional[str] = None,
) -> Callable[[Callable[P, Awaitable[R]]], Callable[P, Awaitable[R]]]:
"""Decorate an async method with a `Measure` context manager.
The Measure is created using `self.clock`; it should only be used to decorate
methods in classes defining an instance-level `clock` attribute.
Usage:
@ -97,18 +102,24 @@ def measure_func(name: Optional[str] = None) -> Callable[[T], T]:
"""
def wrapper(func: T) -> T:
def wrapper(
func: Callable[Concatenate[HasClock, P], Awaitable[R]]
) -> Callable[P, Awaitable[R]]:
block_name = func.__name__ if name is None else name
@wraps(func)
async def measured_func(self: HasClock, *args: Any, **kwargs: Any) -> Any:
async def measured_func(self: HasClock, *args: P.args, **kwargs: P.kwargs) -> R:
with Measure(self.clock, block_name):
r = await func(self, *args, **kwargs)
return r
return cast(T, measured_func)
# There are some shenanigans here, because we're decorating a method but
# explicitly making use of the `self` parameter. The key thing here is that the
# return type within the return type for `measure_func` itself describes how the
# decorated function will be called.
return measured_func # type: ignore[return-value]
return wrapper
return wrapper # type: ignore[return-value]
class Measure:

15
synapse/util/patch_inline_callbacks.py
View file

@ -16,6 +16,8 @@ import functools
import sys
from typing import Any, Callable, Generator, List, TypeVar, cast
from typing_extensions import ParamSpec
from twisted.internet import defer
from twisted.internet.defer import Deferred
from twisted.python.failure import Failure
@ -25,6 +27,7 @@ _already_patched = False
T = TypeVar("T")
P = ParamSpec("P")
def do_patch() -> None:
@ -41,13 +44,13 @@ def do_patch() -> None:
return
def new_inline_callbacks(
f: Callable[..., Generator["Deferred[object]", object, T]]
) -> Callable[..., "Deferred[T]"]:
f: Callable[P, Generator["Deferred[object]", object, T]]
) -> Callable[P, "Deferred[T]"]:
@functools.wraps(f)
def wrapped(*args: Any, **kwargs: Any) -> "Deferred[T]":
def wrapped(*args: P.args, **kwargs: P.kwargs) -> "Deferred[T]":
start_context = current_context()
changes: List[str] = []
orig: Callable[..., "Deferred[T]"] = orig_inline_callbacks(
orig: Callable[P, "Deferred[T]"] = orig_inline_callbacks(
_check_yield_points(f, changes)
)
@ -115,7 +118,7 @@ def do_patch() -> None:
def _check_yield_points(
f: Callable[..., Generator["Deferred[object]", object, T]],
f: Callable[P, Generator["Deferred[object]", object, T]],
changes: List[str],
) -> Callable:
"""Wraps a generator that is about to be passed to defer.inlineCallbacks
@ -138,7 +141,7 @@ def _check_yield_points(
@functools.wraps(f)
def check_yield_points_inner(
*args: Any, **kwargs: Any
*args: P.args, **kwargs: P.kwargs
) -> Generator["Deferred[object]", object, T]:
gen = f(*args, **kwargs)