INNER CODE UNIT · Python

Backup

opentimestamps/opentimestamps-server · otsserver/backup.py:34

class Backup:
    def __init__(self, journal, calendar, cache_path):
        self.journal = journal
        self.calendar = calendar
        self.cache_path = cache_path
        os.makedirs(cache_path, exist_ok=True)

    # Return the bytes of the chunk
    def __getitem__(self, chunk):

        # We use a disk cache, creating a chunk of 1000 commitments is a quite expensive operation of about 10s.
        # The server isn't blocked in the meantime but this could be used by an attacker to degrade calendar performance
        # Moreover is not recommended to set up an HTTP cache more than one year (see RFC 2616), thus, a disk cache is
        #  mandatory.
        cached_kv_bytes = self.read_disk_cache(chunk)
        if cached_kv_bytes is not None:
            return cached_kv_bytes

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