Ali-Akber Saifee created THRIFT-5488:
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Summary: SystemError when using fast binary protocol in python
3.10
Key: THRIFT-5488
URL: https://issues.apache.org/jira/browse/THRIFT-5488
Project: Thrift
Issue Type: Bug
Components: Python - Library
Affects Versions: 0.15.0
Reporter: Ali-Akber Saifee
Up till python 3.9 a DeprecationWarning was raised when '#' formats were used
without defining PY_SSIZE_T_CLEAN:
{code:java}
DeprecationWarning: PY_SSIZE_T_CLEAN will be required for '#' formats
iprot._fast_decode(self, iprot, [self.__class__, self.thrift_spec]) {code}
Starting with python 3.10 this now becomes a runtime SystemError. Details of
change: [Python bug tracker 40943|https://bugs.python.org/issue40943]
This specifically gets exercised in the fast binary python extension module in
ProtocolBase<Impl>::readBytes
([src/protocol.tcc|https://github.com/apache/thrift/blob/master/lib/py/src/ext/protocol.tcc#L279])
when falling back to the building function.
An easy way to reproduce the error is to pass an empty byte array to the
[TSerializer.deserialize|https://github.com/apache/thrift/blob/master/lib/py/src/TSerialization.py#L32]
method
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