ansible/test/sanity/pylint/plugins/blacklist.py

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"""A plugin for pylint to identify imports and functions which should not be used."""
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import astroid
from pylint.checkers import BaseChecker
from pylint.interfaces import IAstroidChecker
class BlacklistEntry(object):
"""Defines a import blacklist entry."""
def __init__(self, alternative, modules_only=False, names=None, ignore_paths=None):
"""
:type alternative: str
:type modules_only: bool
:type names: tuple[str] | None
:type ignore_paths: tuple[str] | None
"""
self.alternative = alternative
self.modules_only = modules_only
self.names = set(names) if names else None
self.ignore_paths = ignore_paths
def applies_to(self, path, name=None):
"""
:type path: str
:type name: str | None
:rtype: bool
"""
if self.names:
if not name:
return False
if name not in self.names:
return False
if self.ignore_paths and any(path.endswith(ignore_path) for ignore_path in self.ignore_paths):
return False
if self.modules_only:
return '/lib/ansible/modules/' in path or '/lib/ansible/module_utils/' in path
return True
class AnsibleBlacklistChecker(BaseChecker):
"""Checker for blacklisted imports and functions."""
__implements__ = (IAstroidChecker,)
name = 'blacklist'
BAD_IMPORT = 'ansible-bad-import'
BAD_IMPORT_FROM = 'ansible-bad-import-from'
BAD_FUNCTION = 'ansible-bad-function'
msgs = dict(
E5101=('Import %s instead of %s',
BAD_IMPORT,
'Identifies imports which should not be used.'),
E5102=('Import %s from %s instead of %s',
BAD_IMPORT_FROM,
'Identifies imports which should not be used.'),
E5103=('Call %s instead of %s',
BAD_FUNCTION,
'Identifies functions which should not be used.'),
)
blacklist_imports = dict(
# Additional imports that we may want to start checking:
# boto=BlacklistEntry('boto3', modules_only=True),
# requests=BlacklistEntry('ansible.module_utils.urls', modules_only=True),
# urllib=BlacklistEntry('ansible.module_utils.urls', modules_only=True),
# see https://docs.python.org/2/library/urllib2.html
urllib2=BlacklistEntry('ansible.module_utils.urls',
ignore_paths=(
'/lib/ansible/module_utils/urls.py',
)),
# see https://docs.python.org/3.7/library/collections.abc.html
collections=BlacklistEntry('ansible.module_utils.common._collections_compat',
ignore_paths=(
'/lib/ansible/module_utils/common/_collections_compat.py',
),
names=(
'MappingView',
'ItemsView',
'KeysView',
'ValuesView',
'Mapping', 'MutableMapping',
'Sequence', 'MutableSequence',
'Set', 'MutableSet',
'Container',
'Hashable',
'Sized',
'Callable',
'Iterable',
'Iterator',
)),
)
blacklist_functions = {
# see https://docs.python.org/2/library/tempfile.html#tempfile.mktemp
'tempfile.mktemp': BlacklistEntry('tempfile.mkstemp'),
'sys.exit': BlacklistEntry('exit_json or fail_json',
ignore_paths=(
'/lib/ansible/module_utils/basic.py',
'/lib/ansible/modules/utilities/logic/async_wrapper.py',
'/lib/ansible/module_utils/common/removed.py',
),
modules_only=True),
}
def visit_import(self, node):
"""
:type node: astroid.node_classes.Import
"""
for name in node.names:
self._check_import(node, name[0])
def visit_importfrom(self, node):
"""
:type node: astroid.node_classes.ImportFrom
"""
self._check_importfrom(node, node.modname, node.names)
def visit_attribute(self, node):
"""
:type node: astroid.node_classes.Attribute
"""
last_child = node.last_child()
# this is faster than using type inference and will catch the most common cases
if not isinstance(last_child, astroid.node_classes.Name):
return
module = last_child.name
entry = self.blacklist_imports.get(module)
if entry and entry.names:
if entry.applies_to(self.linter.current_file, node.attrname):
self.add_message(self.BAD_IMPORT_FROM, args=(node.attrname, entry.alternative, module), node=node)
def visit_call(self, node):
"""
:type node: astroid.node_classes.Call
"""
try:
for i in node.func.inferred():
func = None
if isinstance(i, astroid.scoped_nodes.FunctionDef) and isinstance(i.parent, astroid.scoped_nodes.Module):
func = '%s.%s' % (i.parent.name, i.name)
if not func:
continue
entry = self.blacklist_functions.get(func)
if entry and entry.applies_to(self.linter.current_file):
self.add_message(self.BAD_FUNCTION, args=(entry.alternative, func), node=node)
except astroid.exceptions.InferenceError:
pass
def _check_import(self, node, modname):
"""
:type node: astroid.node_classes.Import
:type modname: str
"""
entry = self.blacklist_imports.get(modname)
if not entry:
return
if entry.applies_to(self.linter.current_file):
self.add_message(self.BAD_IMPORT, args=(entry.alternative, modname), node=node)
def _check_importfrom(self, node, modname, names):
"""
:type node: astroid.node_classes.ImportFrom
:type modname: str
:type names: list[str[
"""
entry = self.blacklist_imports.get(modname)
if not entry:
return
for name in names:
if entry.applies_to(self.linter.current_file, name[0]):
self.add_message(self.BAD_IMPORT_FROM, args=(name[0], entry.alternative, modname), node=node)
def register(linter):
"""required method to auto register this checker """
linter.register_checker(AnsibleBlacklistChecker(linter))