149 lines
4.5 KiB
Python
149 lines
4.5 KiB
Python
# Copyright (c) 2022 The Brave Authors. All rights reserved.
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this file,
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# You can obtain one at http://mozilla.org/MPL/2.0/. */
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import contextlib
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import inspect
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import types
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from typing import Any
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def override_function(scope, name=None, condition=True):
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"""Replaces an existing function in the scope."""
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def decorator(new_function):
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is_dict_scope = isinstance(scope, dict)
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function_name = name or new_function.__name__
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if is_dict_scope:
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original_function = scope.get(function_name, None)
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else:
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original_function = getattr(scope, function_name, None)
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if not callable(original_function):
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raise NameError(f'Failed to override function: '
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f'{function_name} not found or not callable')
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def wrapped_function(*args, **kwargs):
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return new_function(original_function, *args, **kwargs)
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if not condition:
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wrapped_function = original_function
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if is_dict_scope:
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scope[function_name] = wrapped_function
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else:
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setattr(scope, function_name, wrapped_function)
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return wrapped_function
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return decorator
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def override_method(scope, name=None, condition=True):
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"""Replaces an existing method in the class scope."""
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def decorator(new_method):
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assert not isinstance(scope, dict)
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method_name = name or new_method.__name__
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original_method: Any = getattr(scope, method_name, None)
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if not condition:
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wrapped_method = original_method
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else:
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def wrapped_method(self, *args, **kwargs):
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return new_method(self, original_method, *args, **kwargs)
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if inspect.ismethod(original_method):
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setattr(scope, method_name,
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types.MethodType(wrapped_method, scope))
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else:
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assert inspect.isfunction(original_method)
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setattr(scope, method_name, wrapped_method)
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return wrapped_method
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return decorator
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@contextlib.contextmanager
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def override_scope_function(scope, new_function, name=None, condition=True):
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"""Scoped function override helper. Can override a scope function or a class
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method."""
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if not condition:
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yield
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return
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function_name = name or new_function.__name__
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original_function = getattr(scope, function_name, None)
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try:
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if not callable(original_function):
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raise NameError(f'Failed to override scope function: '
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f'{function_name} not found or not callable')
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if inspect.ismethod(original_function):
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def wrapped_method(self, *args, **kwargs):
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return new_function(self, original_function, *args, **kwargs)
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setattr(scope, function_name,
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types.MethodType(wrapped_method, scope))
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else:
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def wrapped_function(*args, **kwargs):
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return new_function(original_function, *args, **kwargs)
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setattr(scope, function_name, wrapped_function)
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yield
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finally:
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if condition and original_function:
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setattr(scope, function_name, original_function)
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@contextlib.contextmanager
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def override_scope_variable(scope,
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name,
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value,
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fail_if_not_found=True,
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condition=True):
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"""Scoped variable override helper."""
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if not condition:
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yield
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return
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is_dict_scope = isinstance(scope, dict)
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def _has(scope, name):
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return name in scope if is_dict_scope else hasattr(scope, name)
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def _get(scope, name):
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return scope[name] if is_dict_scope else getattr(scope, name)
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def _set(scope, name, value):
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if is_dict_scope:
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scope[name] = value
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else:
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setattr(scope, name, value)
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def _del(scope, name):
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if is_dict_scope:
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del scope[name]
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else:
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delattr(scope, name)
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var_exist = _has(scope, name)
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if fail_if_not_found and not var_exist:
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raise NameError(f'Failed to override scope variable: {name} not found')
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original_value = _get(scope, name) if var_exist else None
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try:
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_set(scope, name, value)
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yield
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finally:
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if var_exist:
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_set(scope, name, original_value)
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else:
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_del(scope, name)
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