def clear_excess(self, utxo_flush_count):
# < might happen at end of compaction as both DBs cannot be
# updated atomically
if self.flush_count <= utxo_flush_count:
return
self.logger.info('DB shut down uncleanly. Scanning for '
'excess history flushes...')
keys = []
for key, _hist in self.db.iterator(prefix=b''):
flush_id, = unpack_be_uint16_from(key[-2:])
if flush_id > utxo_flush_count:
keys.append(key)
self.logger.info(f'deleting {len(keys):,d} history entries')
self.flush_count = utxo_flush_count
with self.db.write_batch() as batch:
for key in keys:
batch.delete(key)
self.write_state(batch)
self.logger.info('deleted excess history entries')
def _read_be_uint16(self):
result, = unpack_be_uint16_from(self.binary, self.cursor)
self.cursor += 2
return result
