76 lines
3.0 KiB
Python
76 lines
3.0 KiB
Python
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# Copyright (c) 2015-2016 Claudiu Popa <pcmanticore@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 exceptions
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from pylint import checkers
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from pylint.checkers import utils as checker_utils
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from pylint import interfaces
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from pylint import utils
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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': ('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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'E1701': ("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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def open(self):
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self._ignore_mixin_members = utils.get_global_option(self, 'ignore-mixin-members')
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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 (sys.version_info[:2] == (3, 5) or
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isinstance(child, astroid.YieldFrom)):
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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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infered = checker_utils.safe_infer(ctx_mgr)
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if infered is None or infered is astroid.YES:
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continue
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if isinstance(infered, astroid.Instance):
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try:
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infered.getattr('__aenter__')
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infered.getattr('__aexit__')
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except exceptions.NotFoundError:
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if isinstance(infered, 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(infered):
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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 infered.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('not-async-context-manager',
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node=node, args=(infered.name, ))
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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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