Fix SSL read over-consuming TCP data and ZeroReturn handling by youknowone · Pull Request #7418 · RustPython/RustPython

Use single-record reading (recv_one_tls_record) for all SSL
reads, not just handshake. This prevents rustls from eagerly
consuming close_notify alongside application data, which left
the TCP buffer empty and caused select()-based servers to miss
readability and time out.

Also fix recv_one_tls_record to return Eof (not WantRead) when
peek returns empty bytes, since empty peek means the peer has
closed the TCP connection.

Use single-record reading (recv_one_tls_record) for all SSL
reads, not just handshake. This prevents rustls from eagerly
consuming close_notify alongside application data, which left
the TCP buffer empty and caused select()-based servers to miss
readability and time out.

Also fix recv_one_tls_record to return Eof (not WantRead) when
peek returns empty bytes, since empty peek means the peer has
closed the TCP connection.