60 lines
1.9 KiB
Python
60 lines
1.9 KiB
Python
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# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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# For details: https://github.com/pylint-dev/pylint/blob/main/LICENSE
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# Copyright (c) https://github.com/pylint-dev/pylint/blob/main/CONTRIBUTORS.txt
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from __future__ import annotations
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from typing import TYPE_CHECKING
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from astroid import nodes
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from pylint.checkers import BaseChecker
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from pylint.checkers.utils import only_required_for_messages, safe_infer
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if TYPE_CHECKING:
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from pylint.lint import PyLinter
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class ThreadingChecker(BaseChecker):
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"""Checks for threading module.
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- useless with lock - locking used in wrong way that has no effect (with threading.Lock():)
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"""
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name = "threading"
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LOCKS = frozenset(
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(
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"threading.Lock",
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"threading.RLock",
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"threading.Condition",
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"threading.Semaphore",
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"threading.BoundedSemaphore",
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)
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)
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msgs = {
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"W2101": (
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"'%s()' directly created in 'with' has no effect",
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"useless-with-lock",
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"Used when a new lock instance is created by using with statement "
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"which has no effect. Instead, an existing instance should be used to acquire lock.",
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),
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}
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@only_required_for_messages("useless-with-lock")
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def visit_with(self, node: nodes.With) -> None:
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context_managers = (c for c, _ in node.items if isinstance(c, nodes.Call))
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for context_manager in context_managers:
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if isinstance(context_manager, nodes.Call):
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infered_function = safe_infer(context_manager.func)
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if infered_function is None:
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continue
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qname = infered_function.qname()
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if qname in self.LOCKS:
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self.add_message("useless-with-lock", node=node, args=qname)
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def register(linter: PyLinter) -> None:
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linter.register_checker(ThreadingChecker(linter))
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