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