def update(self, event: shard_events.MemberChunkEvent) -> None:
if self.missing_chunk_indexes is None:
self.average_chunk_size = len(event.members)
self.chunk_count = event.chunk_count
self.missing_chunk_indexes = list(range(event.chunk_count))
self.not_found_ids.extend(event.not_found)
self.missing_chunk_indexes.remove(event.chunk_index)
self._mono_last_received = time.monotonic_ns()
self.last_received = time.utc_datetime()
def _fixed_size_nonce() -> str:
# This generates nonces of length 28 for use in member chunking.
head = time.monotonic_ns().to_bytes(8, "big")
tail = random.getrandbits(92).to_bytes(12, "big")
return base64.b64encode(head + tail).decode("ascii")
def _random_nonce() -> str:
head = time.monotonic_ns().to_bytes(8, "big")
tail = random.getrandbits(92).to_bytes(12, "big")
return base64.b64encode(head + tail).decode("ascii")
def is_complete(self) -> bool:
if self.received_chunks == self.chunk_count:
return True
return self._mono_last_received is not None and time.monotonic_ns(
) - self._mono_last_received > EXPIRY_TIME