76 lines
3.0 KiB
Python
76 lines
3.0 KiB
Python
# Copyright (c) 2015-2016 Claudiu Popa <pcmanticore@gmail.com>
|
|
|
|
# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
|
|
# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
|
|
|
|
"""Checker for anything related to the async protocol (PEP 492)."""
|
|
|
|
import sys
|
|
|
|
import astroid
|
|
from astroid import exceptions
|
|
|
|
from pylint import checkers
|
|
from pylint.checkers import utils as checker_utils
|
|
from pylint import interfaces
|
|
from pylint import utils
|
|
|
|
|
|
class AsyncChecker(checkers.BaseChecker):
|
|
__implements__ = interfaces.IAstroidChecker
|
|
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):
|
|
self._ignore_mixin_members = utils.get_global_option(self, 'ignore-mixin-members')
|
|
|
|
@checker_utils.check_messages('yield-inside-async-function')
|
|
def visit_asyncfunctiondef(self, node):
|
|
for child in node.nodes_of_class(astroid.Yield):
|
|
if child.scope() is node and (sys.version_info[:2] == (3, 5) or
|
|
isinstance(child, astroid.YieldFrom)):
|
|
self.add_message('yield-inside-async-function', node=child)
|
|
|
|
@checker_utils.check_messages('not-async-context-manager')
|
|
def visit_asyncwith(self, node):
|
|
for ctx_mgr, _ in node.items:
|
|
infered = checker_utils.safe_infer(ctx_mgr)
|
|
if infered is None or infered is astroid.YES:
|
|
continue
|
|
|
|
if isinstance(infered, astroid.Instance):
|
|
try:
|
|
infered.getattr('__aenter__')
|
|
infered.getattr('__aexit__')
|
|
except exceptions.NotFoundError:
|
|
if isinstance(infered, astroid.Instance):
|
|
# If we do not know the bases of this class,
|
|
# just skip it.
|
|
if not checker_utils.has_known_bases(infered):
|
|
continue
|
|
# Just ignore mixin classes.
|
|
if self._ignore_mixin_members:
|
|
if infered.name[-5:].lower() == 'mixin':
|
|
continue
|
|
else:
|
|
continue
|
|
|
|
self.add_message('not-async-context-manager',
|
|
node=node, args=(infered.name, ))
|
|
|
|
|
|
def register(linter):
|
|
"""required method to auto register this checker"""
|
|
linter.register_checker(AsyncChecker(linter))
|