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async.py
# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html # For details: https://github.com/PyCQA/pylint/blob/main/LICENSE # Copyright (c) https://github.com/PyCQA/pylint/blob/main/CONTRIBUTORS.txt """Checker for anything related to the async protocol (PEP 492).""" from __future__ import annotations import sys from typing import TYPE_CHECKING import astroid from astroid import nodes, util from pylint import checkers from pylint.checkers import utils as checker_utils from pylint.checkers.utils import decorated_with if TYPE_CHECKING: from pylint.lint import PyLinter class AsyncChecker(checkers.BaseChecker): name = "async" msgs = { "E1700": ( "Yield inside async function", "yield-inside-async-function", "Used when an `yield` or `yield from` statement is " "found inside an async function.", {"minversion": (3, 5)}, ), "E1701": ( "Async context manager '%s' doesn't implement __aenter__ and __aexit__.", "not-async-context-manager", "Used when an async context manager is used with an object " "that does not implement the async context management protocol.", {"minversion": (3, 5)}, ), } def open(self) -> None: self._mixin_class_rgx = self.linter.config.mixin_class_rgx self._async_generators = ["contextlib.asynccontextmanager"] @checker_utils.only_required_for_messages("yield-inside-async-function") def visit_asyncfunctiondef(self, node: nodes.AsyncFunctionDef) -> None: for child in node.nodes_of_class(nodes.Yield): if child.scope() is node and ( sys.version_info[:2] == (3, 5) or isinstance(child, nodes.YieldFrom) ): self.add_message("yield-inside-async-function", node=child) @checker_utils.only_required_for_messages("not-async-context-manager") def visit_asyncwith(self, node: nodes.AsyncWith) -> None: for ctx_mgr, _ in node.items: inferred = checker_utils.safe_infer(ctx_mgr) if inferred is None or isinstance(inferred, util.UninferableBase): continue if isinstance(inferred, nodes.AsyncFunctionDef): # Check if we are dealing with a function decorated # with contextlib.asynccontextmanager. if decorated_with(inferred, self._async_generators): continue elif isinstance(inferred, astroid.bases.AsyncGenerator): # Check if we are dealing with a function decorated # with contextlib.asynccontextmanager. if decorated_with(inferred.parent, self._async_generators): continue else: try: inferred.getattr("__aenter__") inferred.getattr("__aexit__") except astroid.exceptions.NotFoundError: if isinstance(inferred, astroid.Instance): # If we do not know the bases of this class, # just skip it. if not checker_utils.has_known_bases(inferred): continue # Ignore mixin classes if they match the rgx option. if ( "not-async-context-manager" in self.linter.config.ignored_checks_for_mixins and self._mixin_class_rgx.match(inferred.name) ): continue else: continue self.add_message( "not-async-context-manager", node=node, args=(inferred.name,) ) def register(linter: PyLinter) -> None: linter.register_checker(AsyncChecker(linter))
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