如何在 Cassandra Python 驱动程序中存储 PagingState？

Question

I'm implementing a REST API which behind the scenes queries Cassandra (via Python driver) and returns the result. Now the items to be queried will be huge so I want to have pagination capability.

The ResultSet returned by execute() method has a property called paging_state which seems to be byte literal. I would like to return this in the response body with something like startKey=<PAGING_STATE_VALUE> . Currently, I see the paging state looking something like b'\x0cFY5D70822742\x00\xf0\x7f\xff\xff\xe6\x00' .

How should I decode it so that I can append it as a proper string in my API response body. I tried decoding with UTF-8 , ASCII but they are failing.

Answer 1

The paging state by definition is binary, and won't be represented as a string.

Just encode it as base64, quoted printable, uuencode, or hex string - for example by using built-in binascii module. There are plenty of functions there, like, hexlify to convert from bytes to hex string.