69 lines
2.1 KiB
Python
69 lines
2.1 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from urllib import parse
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class HookableMixin(object):
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"""Mixin so classes can register and run hooks."""
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_hooks_map = {}
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@classmethod
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def add_hook(cls, hook_type, hook_func):
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if hook_type not in cls._hooks_map:
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cls._hooks_map[hook_type] = []
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cls._hooks_map[hook_type].append(hook_func)
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@classmethod
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def run_hooks(cls, hook_type, *args, **kwargs):
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hook_funcs = cls._hooks_map.get(hook_type) or []
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for hook_func in hook_funcs:
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hook_func(*args, **kwargs)
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def safe_issubclass(*args):
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"""Like issubclass, but will just return False if not a class."""
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try:
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if issubclass(*args):
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return True
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except TypeError:
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pass
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return False
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def get_function_name(func):
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return "%s.%s" % (func.__module__, func.__qualname__)
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def safe_urlencode(params_dict):
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"""Workaround incompatible change to urllib.parse
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urllib's parse library used to adhere to RFC 2396 until
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python 3.7. The library moved from RFC 2396 to RFC 3986
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for quoting URL strings in python 3.7 and '~' is now
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included in the set of reserved characters. [1]
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This utility ensures "~" is never encoded.
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See LP 1785283 [2] for more details.
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[1] https://docs.python.org/3/library/urllib.parse.html#url-quoting
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[2] https://bugs.launchpad.net/python-manilaclient/+bug/1785283
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:param params_dict can be a list of (k,v) tuples, or a dictionary
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"""
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parsed_params = parse.urlencode(params_dict)
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return parsed_params.replace("%7E", "~")
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