# Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. """Mistral's pep8 extensions. In order to make the review process faster and easier for core devs we are adding some Mistral specific pep8 checks. This will catch common errors. There are two types of pep8 extensions. One is a function that takes either a physical or logical line. The physical or logical line is the first param in the function definition and can be followed by other parameters supported by pep8. The second type is a class that parses AST trees. For more info please see pep8.py. """ import ast import re import six oslo_namespace_imports_dot = re.compile(r"import[\s]+oslo[.][^\s]+") oslo_namespace_imports_from_dot = re.compile(r"from[\s]+oslo[.]") oslo_namespace_imports_from_root = re.compile(r"from[\s]+oslo[\s]+import[\s]+") def check_oslo_namespace_imports(logical_line): if re.match(oslo_namespace_imports_from_dot, logical_line): msg = ("O323: '%s' must be used instead of '%s'.") % ( logical_line.replace('oslo.', 'oslo_'), logical_line) yield(0, msg) elif re.match(oslo_namespace_imports_from_root, logical_line): msg = ("O323: '%s' must be used instead of '%s'.") % ( logical_line.replace('from oslo import ', 'import oslo_'), logical_line) yield(0, msg) elif re.match(oslo_namespace_imports_dot, logical_line): msg = ("O323: '%s' must be used instead of '%s'.") % ( logical_line.replace('import', 'from').replace('.', ' import '), logical_line) yield(0, msg) class BaseASTChecker(ast.NodeVisitor): """Provides a simple framework for writing AST-based checks. Subclasses should implement visit_* methods like any other AST visitor implementation. When they detect an error for a particular node the method should call ``self.add_error(offending_node)``. Details about where in the code the error occurred will be pulled from the node object. Subclasses should also provide a class variable named CHECK_DESC to be used for the human readable error message. """ def __init__(self, tree, filename): """This object is created automatically by pep8. :param tree: an AST tree :param filename: name of the file being analyzed (ignored by our checks) """ self._tree = tree self._errors = [] def run(self): """Called automatically by pep8.""" self.visit(self._tree) return self._errors def add_error(self, node, message=None): """Add an error caused by a node to the list of errors for pep8.""" message = message or self.CHECK_DESC error = (node.lineno, node.col_offset, message, self.__class__) self._errors.append(error) class CheckForLoggingIssues(BaseASTChecker): CHECK_DESC = ('M001 Using the deprecated Logger.warn') LOG_MODULES = ('logging', 'oslo_log.log') def __init__(self, tree, filename): super(CheckForLoggingIssues, self).__init__(tree, filename) self.logger_names = [] self.logger_module_names = [] # NOTE(dstanek): This kinda accounts for scopes when talking # about only leaf node in the graph. self.assignments = {} def _filter_imports(self, module_name, alias): """Keeps lists of logging imports.""" if module_name in self.LOG_MODULES: self.logger_module_names.append(alias.asname or alias.name) def visit_Import(self, node): for alias in node.names: self._filter_imports(alias.name, alias) return super(CheckForLoggingIssues, self).generic_visit(node) def visit_ImportFrom(self, node): for alias in node.names: full_name = '%s.%s' % (node.module, alias.name) self._filter_imports(full_name, alias) return super(CheckForLoggingIssues, self).generic_visit(node) def _find_name(self, node): """Return the fully qualified name or a Name or a Attribute.""" if isinstance(node, ast.Name): return node.id elif (isinstance(node, ast.Attribute) and isinstance(node.value, (ast.Name, ast.Attribute))): obj_name = self._find_name(node.value) if obj_name is None: return None method_name = node.attr return obj_name + '.' + method_name elif isinstance(node, six.string_types): return node else: # Could be Subscript, Call or many more return None def visit_Assign(self, node): """Look for 'LOG = logging.getLogger' This handles the simple case: name = [logging_module].getLogger(...) """ attr_node_types = (ast.Name, ast.Attribute) if (len(node.targets) != 1 or not isinstance(node.targets[0], attr_node_types)): # Say no to: "x, y = ..." return super(CheckForLoggingIssues, self).generic_visit(node) target_name = self._find_name(node.targets[0]) if (isinstance(node.value, ast.BinOp) and isinstance(node.value.op, ast.Mod)): if (isinstance(node.value.left, ast.Call) and isinstance(node.value.left.func, ast.Name)): # NOTE(dstanek): This is done to match cases like: # `msg = _('something %s') % x` node = ast.Assign(value=node.value.left) if not isinstance(node.value, ast.Call): # node.value must be a call to getLogger self.assignments.pop(target_name, None) return super(CheckForLoggingIssues, self).generic_visit(node) if (not isinstance(node.value.func, ast.Attribute) or not isinstance(node.value.func.value, attr_node_types)): # Function must be an attribute on an object like # logging.getLogger return super(CheckForLoggingIssues, self).generic_visit(node) object_name = self._find_name(node.value.func.value) func_name = node.value.func.attr if (object_name in self.logger_module_names and func_name == 'getLogger'): self.logger_names.append(target_name) return super(CheckForLoggingIssues, self).generic_visit(node) def visit_Call(self, node): """Look for the 'LOG.*' calls.""" # obj.method if isinstance(node.func, ast.Attribute): obj_name = self._find_name(node.func.value) if isinstance(node.func.value, ast.Name): method_name = node.func.attr elif isinstance(node.func.value, ast.Attribute): obj_name = self._find_name(node.func.value) method_name = node.func.attr else: # Could be Subscript, Call or many more return super(CheckForLoggingIssues, self).generic_visit(node) # If dealing with a logger the method can't be "warn". if obj_name in self.logger_names and method_name == 'warn': self.add_error(node.args[0]) return super(CheckForLoggingIssues, self).generic_visit(node) def factory(register): register(check_oslo_namespace_imports) register(CheckForLoggingIssues)