62 lines
1.4 KiB
Python
62 lines
1.4 KiB
Python
# standard imports
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import hashlib
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class SyncState:
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def __init__(self, state_store):
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self.state_store = state_store
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self.digest = b'\x00' * 32
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self.summed = False
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self.__syncs = {}
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self.synced = False
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self.connected = False
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self.state_store.add('INTERRUPT')
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self.state_store.add('LOCK')
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def __verify_sum(self, v):
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if not isinstance(v, bytes) and not isinstance(v, bytearray):
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raise ValueError('argument must be instance of bytes')
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if len(v) != 32:
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raise ValueError('argument must be 32 bytes')
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def register(self, fltr):
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if self.summed:
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raise RuntimeError('filter already applied')
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z = fltr.sum()
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self.__verify_sum(z)
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self.digest += z
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s = fltr.common_name()
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self.state_store.add(s)
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def sum(self):
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h = hashlib.sha256()
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h.update(self.digest)
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self.digest = h.digest()
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self.summed = True
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return self.digest
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def connect(self):
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if not self.synced:
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for v in self.state_store.all():
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self.state_store.sync(v)
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self.__syncs[v] = True
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self.synced = True
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self.connected = True
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def disconnect(self):
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self.connected = False
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def lock(self):
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pass
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def unlock(self):
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pass
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