INNER CODE UNIT · Python

__getitem__

opentimestamps/opentimestamps-server · otsserver/backup.py:42

    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

        # TODO next code must be run only once, LOCK or something
        backup_map = {}
        start = chunk*PAGING
        end = start+PAGING

        # Iterate in reverse to fail fast if this chunk is not complete, a chunk is considered complete if all relative
        # 1000 commitments are complete. Which means a tx with more of 6 confirmations timestamp them
        for i in range(start, end)[::-1]:

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