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new Lockable class; lock global vars after initialization (amended)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| #!/usr/bin/env python3 | ||
| # | ||
| # mmgen = Multi-Mode GENerator, command-line Bitcoin cold storage solution | ||
| # Copyright (C)2013-2020 The MMGen Project <mmgen@tuta.io> | ||
| # | ||
| # This program is free software: you can redistribute it and/or modify | ||
| # it under the terms of the GNU General Public License as published by | ||
| # the Free Software Foundation, either version 3 of the License, or | ||
| # (at your option) any later version. | ||
| # | ||
| # This program is distributed in the hope that it will be useful, | ||
| # but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| # GNU General Public License for more details. | ||
| # | ||
| # You should have received a copy of the GNU General Public License | ||
| # along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| """ | ||
| base_obj.py: base objects with no internal imports for the MMGen suite | ||
| """ | ||
|
|
||
| class AttrCtrl: | ||
| """ | ||
| After instance is locked, forbid setting any attribute if the attribute is not present | ||
| in either the class or instance dict. | ||
| If _use_class_attr is True, ensure that attribute's type matches that of the class | ||
| attribute, unless the class attribute is set to None, in which case no type checking | ||
| is performed. | ||
| """ | ||
| _lock = False | ||
| _use_class_attr = False | ||
|
|
||
| def lock(self): | ||
| self._lock = True | ||
|
|
||
| def __setattr__(self,name,value): | ||
| if self._lock: | ||
| def do_error(name,value,ref_val): | ||
| raise AttributeError( | ||
| f'{value!r}: invalid value for attribute {name!r}' | ||
| + ' of {} object (must be of type {}, not {})'.format( | ||
| type(self).__name__, | ||
| type(ref_val).__name__, | ||
| type(value).__name__ ) ) | ||
|
|
||
| if not hasattr(self,name): | ||
| raise AttributeError(f'{type(self).__name__} object has no attribute {name!r}') | ||
|
|
||
| ref_val = getattr(type(self),name) if self._use_class_attr else getattr(self,name) | ||
|
|
||
| if (ref_val is not None) and not isinstance(value,type(ref_val)): | ||
| do_error(name,value,ref_val) | ||
|
|
||
| return object.__setattr__(self,name,value) | ||
|
|
||
| def __delattr__(self,name,value): | ||
| raise AttributeError('attribute cannot be deleted') | ||
|
|
||
| class Lockable(AttrCtrl): | ||
| """ | ||
| After instance is locked, its attributes become read-only, with the following exceptions: | ||
| - if the attribute's name is in _set_ok, attr can be set once after locking, if unset | ||
| - if the attribute's name is in _reset_ok, read-only restrictions are bypassed and only | ||
| AttrCtrl checking is performed | ||
| To determine whether an attribute is set, it's matched against either None or the class attribute, | ||
| if _use_class_attr is True | ||
| """ | ||
| _set_ok = () | ||
| _reset_ok = () | ||
|
|
||
| def __setattr__(self,name,value): | ||
| if self._lock and hasattr(self,name): | ||
| if name not in (self._set_ok + self._reset_ok): | ||
| raise AttributeError(f'attribute {name!r} of {type(self).__name__} object is read-only') | ||
| elif name not in self._reset_ok: | ||
| #print(self.__dict__) | ||
| if not ( | ||
| getattr(self,name) is None or | ||
| ( self._use_class_attr and name not in self.__dict__ ) ): | ||
| raise AttributeError( | ||
| f'attribute {name!r} of {type(self).__name__} object is already set,' | ||
| + ' and resetting is forbidden' ) | ||
| # name is in (_set_ok + _reset_ok) -- allow name to be in both lists | ||
|
|
||
| return AttrCtrl.__setattr__(self,name,value) |
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