7cb8c347b5
This guards function calls by storing the function, args and kwargs into an added attribute '__auth_fcall' on the object using the decorator, then emits a signal that can be handled by the UI. The UI can signal auth-success or auth-failure back to the object by calling either the authProceed() slot or the authCancel slot. The object utilizing this decorator MUST inherit/mixin the AuthMixin class, which provides the above two slots, and handling of state. The decorator also accepts a 'reject' parameter, containing the name of a parameterless function on the object, which is called when authentication has failed/is cancelled.
59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
from functools import wraps, partial
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from PyQt5.QtCore import pyqtSignal, pyqtSlot
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from electrum.logging import get_logger
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def auth_protect(func=None, reject=None):
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if func is None:
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return partial(auth_protect, reject=reject)
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@wraps(func)
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def wrapper(self, *args, **kwargs):
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self._logger.debug(str(self))
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if hasattr(self, '__auth_fcall'):
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self._logger.debug('object already has a pending authed function call')
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raise Exception('object already has a pending authed function call')
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setattr(self, '__auth_fcall', (func,args,kwargs,reject))
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getattr(self, 'authRequired').emit()
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return wrapper
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class AuthMixin:
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_auth_logger = get_logger(__name__)
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authRequired = pyqtSignal()
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@pyqtSlot()
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def authProceed(self):
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self._auth_logger.debug('Proceeding with authed fn()')
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try:
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self._auth_logger.debug(str(getattr(self, '__auth_fcall')))
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(func,args,kwargs,reject) = getattr(self, '__auth_fcall')
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r = func(self, *args, **kwargs)
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return r
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except Exception as e:
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self._auth_logger.error('Error executing wrapped fn(): %s' % repr(e))
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raise e
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finally:
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delattr(self,'__auth_fcall')
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@pyqtSlot()
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def authCancel(self):
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self._auth_logger.debug('Cancelling authed fn()')
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if not hasattr(self, '__auth_fcall'):
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return
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try:
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(func,args,kwargs,reject) = getattr(self, '__auth_fcall')
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if reject is not None:
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if hasattr(self, reject):
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getattr(self, reject)()
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else:
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self._auth_logger.error('Reject method \'%s\' not defined' % reject)
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except Exception as e:
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self._auth_logger.error('Error executing reject function \'%s\': %s' % (reject, repr(e)))
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raise e
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finally:
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delattr(self, '__auth_fcall')
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