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91 lines
3.4 KiB
Python
91 lines
3.4 KiB
Python
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# Copyright (c) 2015-2018, 2020 Claudiu Popa <pcmanticore@gmail.com>
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# Copyright (c) 2017 Derek Gustafson <degustaf@gmail.com>
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# Copyright (c) 2019 Pierre Sassoulas <pierre.sassoulas@gmail.com>
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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/PyCQA/pylint/blob/master/COPYING
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"""Checker for anything related to the async protocol (PEP 492)."""
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import sys
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import astroid
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from astroid import bases, exceptions
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from pylint import checkers, interfaces, utils
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from pylint.checkers import utils as checker_utils
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from pylint.checkers.utils import decorated_with
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class AsyncChecker(checkers.BaseChecker):
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__implements__ = interfaces.IAstroidChecker
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name = "async"
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msgs = {
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"E1700": (
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"Yield inside async function",
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"yield-inside-async-function",
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"Used when an `yield` or `yield from` statement is "
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"found inside an async function.",
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{"minversion": (3, 5)},
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),
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"E1701": (
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"Async context manager '%s' doesn't implement __aenter__ and __aexit__.",
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"not-async-context-manager",
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"Used when an async context manager is used with an object "
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"that does not implement the async context management protocol.",
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{"minversion": (3, 5)},
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),
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}
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def open(self):
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self._ignore_mixin_members = utils.get_global_option(
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self, "ignore-mixin-members"
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)
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self._async_generators = ["contextlib.asynccontextmanager"]
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@checker_utils.check_messages("yield-inside-async-function")
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def visit_asyncfunctiondef(self, node):
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for child in node.nodes_of_class(astroid.Yield):
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if child.scope() is node and (
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sys.version_info[:2] == (3, 5) or isinstance(child, astroid.YieldFrom)
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):
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self.add_message("yield-inside-async-function", node=child)
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@checker_utils.check_messages("not-async-context-manager")
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def visit_asyncwith(self, node):
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for ctx_mgr, _ in node.items:
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inferred = checker_utils.safe_infer(ctx_mgr)
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if inferred is None or inferred is astroid.Uninferable:
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continue
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if isinstance(inferred, bases.AsyncGenerator):
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# Check if we are dealing with a function decorated
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# with contextlib.asynccontextmanager.
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if decorated_with(inferred.parent, self._async_generators):
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continue
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else:
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try:
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inferred.getattr("__aenter__")
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inferred.getattr("__aexit__")
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except exceptions.NotFoundError:
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if isinstance(inferred, astroid.Instance):
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# If we do not know the bases of this class,
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# just skip it.
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if not checker_utils.has_known_bases(inferred):
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continue
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# Just ignore mixin classes.
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if self._ignore_mixin_members:
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if inferred.name[-5:].lower() == "mixin":
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continue
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else:
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continue
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self.add_message(
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"not-async-context-manager", node=node, args=(inferred.name,)
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)
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def register(linter):
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"""required method to auto register this checker"""
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linter.register_checker(AsyncChecker(linter))
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