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###############################################################################
# Copyright (c) 2017 Koren Lev (Cisco Systems), Yaron Yogev (Cisco Systems) #
# and others #
# #
# All rights reserved. This program and the accompanying materials #
# are made available under the terms of the Apache License, Version 2.0 #
# which accompanies this distribution, and is available at #
# http://www.apache.org/licenses/LICENSE-2.0 #
###############################################################################
import importlib
import signal
from argparse import Namespace
from typing import Dict, Callable
import os
import re
from bson.objectid import ObjectId
class SignalHandler:
def __init__(self, signals=(signal.SIGTERM, signal.SIGINT)):
super().__init__()
self.terminated = False
for sig in signals:
signal.signal(sig, self.handle)
def handle(self, signum, frame):
self.terminated = True
class ClassResolver:
instances = {}
# convert class name in camel case to module file name in underscores
@staticmethod
def get_module_file_by_class_name(class_name):
s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', class_name)
module_file = re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower()
return module_file
# convert module file name in underscores to class name in camel case
@staticmethod
def get_class_name_by_module(module_name):
name_parts = [word.capitalize() for word in module_name.split('_')]
class_name = ''.join(name_parts)
return class_name
@staticmethod
def get_fully_qualified_class(class_name: str = None,
package_name: str = "discover",
module_name: str = None):
module_file = module_name if module_name \
else ClassResolver.get_module_file_by_class_name(class_name)
module_parts = [package_name, module_file]
module_name = ".".join(module_parts)
try:
class_module = importlib.import_module(module_name)
except ImportError:
raise ValueError('could not import module {}'.format(module_name))
clazz = getattr(class_module, class_name)
return clazz
@staticmethod
def prepare_class(class_name: str = None,
package_name: str = "discover",
module_name: str = None):
if not class_name and not module_name:
raise ValueError('class_name or module_name must be provided')
if not class_name:
class_name = ClassResolver.get_class_name_by_module(module_name)
if class_name in ClassResolver.instances:
return 'instance', ClassResolver.instances[class_name]
clazz = ClassResolver.get_fully_qualified_class(class_name, package_name,
module_name)
return 'class', clazz
@staticmethod
def get_instance_of_class(class_name: str = None,
package_name: str = "discover",
module_name: str = None):
val_type, clazz = \
ClassResolver.prepare_class(class_name=class_name,
package_name=package_name,
module_name=module_name)
if val_type == 'instance':
return clazz
instance = clazz()
ClassResolver.instances[class_name] = instance
return instance
@staticmethod
def get_instance_single_arg(arg: object,
class_name: str = None,
package_name: str = "discover",
module_name: str = None):
val_type, clazz = \
ClassResolver.prepare_class(class_name=class_name,
package_name=package_name,
module_name=module_name)
if val_type == 'instance':
return clazz
instance = clazz(arg)
ClassResolver.instances[class_name] = instance
return instance
# TODO: translate the following comment
# when search in the mongo db, need to
# generate the ObjectId with the string
def generate_object_ids(keys, obj):
for key in keys:
if key in obj:
o = obj.pop(key)
if o:
try:
o = ObjectId(o)
except Exception:
raise Exception("{0} is not a valid object id".
format(o))
obj[key] = o
# Get arguments from CLI or another source
# and convert them to dict to enforce uniformity.
# Throws a TypeError if arguments can't be converted to dict.
def setup_args(args: dict,
defaults: Dict[str, object],
get_cmd_args: Callable[[], Namespace] = None):
if defaults is None:
defaults = {}
if args is None and get_cmd_args is not None:
args = vars(get_cmd_args())
elif not isinstance(args, dict):
try:
args = dict(args)
except TypeError:
try:
args = vars(args)
except TypeError:
raise TypeError("Wrong arguments format")
return dict(defaults, **args)
def encode_router_id(host_id: str, uuid: str):
return '-'.join([host_id, 'qrouter', uuid])
def decode_router_id(router_id: str):
return router_id.split('qrouter-')[-1]
def get_extension(file_path: str) -> str:
return os.path.splitext(file_path)[1][1:]
def encode_aci_dn(object_id):
return object_id.replace("topology/", "").replace("/", "__")
def decode_aci_dn(object_id):
return object_id.replace("__", "/")
def get_object_path_part(path: str, part_name: str):
match = re.match(".*/{}/(.+?)/.*".format(part_name), path)
return match.group(1) if match else None
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