mirror of
https://mau.dev/maunium/synapse.git
synced 2024-11-18 16:02:15 +01:00
85 lines
2.8 KiB
Python
85 lines
2.8 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2020 The Matrix.org Foundation C.I.C.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# 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.
|
|
|
|
"""This is a mypy plugin for Synpase to deal with some of the funky typing that
|
|
can crop up, e.g the cache descriptors.
|
|
"""
|
|
|
|
from typing import Callable, Optional
|
|
|
|
from mypy.plugin import MethodSigContext, Plugin
|
|
from mypy.typeops import bind_self
|
|
from mypy.types import CallableType
|
|
|
|
|
|
class SynapsePlugin(Plugin):
|
|
def get_method_signature_hook(
|
|
self, fullname: str
|
|
) -> Optional[Callable[[MethodSigContext], CallableType]]:
|
|
if fullname.startswith(
|
|
"synapse.util.caches.descriptors._CachedFunction.__call__"
|
|
):
|
|
return cached_function_method_signature
|
|
return None
|
|
|
|
|
|
def cached_function_method_signature(ctx: MethodSigContext) -> CallableType:
|
|
"""Fixes the `_CachedFunction.__call__` signature to be correct.
|
|
|
|
It already has *almost* the correct signature, except:
|
|
|
|
1. the `self` argument needs to be marked as "bound"; and
|
|
2. any `cache_context` argument should be removed.
|
|
"""
|
|
|
|
# First we mark this as a bound function signature.
|
|
signature = bind_self(ctx.default_signature)
|
|
|
|
# Secondly, we remove any "cache_context" args.
|
|
#
|
|
# Note: We should be only doing this if `cache_context=True` is set, but if
|
|
# it isn't then the code will raise an exception when its called anyway, so
|
|
# its not the end of the world.
|
|
context_arg_index = None
|
|
for idx, name in enumerate(signature.arg_names):
|
|
if name == "cache_context":
|
|
context_arg_index = idx
|
|
break
|
|
|
|
if context_arg_index:
|
|
arg_types = list(signature.arg_types)
|
|
arg_types.pop(context_arg_index)
|
|
|
|
arg_names = list(signature.arg_names)
|
|
arg_names.pop(context_arg_index)
|
|
|
|
arg_kinds = list(signature.arg_kinds)
|
|
arg_kinds.pop(context_arg_index)
|
|
|
|
signature = signature.copy_modified(
|
|
arg_types=arg_types, arg_names=arg_names, arg_kinds=arg_kinds,
|
|
)
|
|
|
|
return signature
|
|
|
|
|
|
def plugin(version: str):
|
|
# This is the entry point of the plugin, and let's us deal with the fact
|
|
# that the mypy plugin interface is *not* stable by looking at the version
|
|
# string.
|
|
#
|
|
# However, since we pin the version of mypy Synapse uses in CI, we don't
|
|
# really care.
|
|
return SynapsePlugin
|