Method set_sni_callback

crates/stdlib/src/ssl.rs:1639–1653

(
            &self,
            callback: Option<PyObjectRef>,
            vm: &VirtualMachine,
        )

        #[pygetset(setter)]
        fn set_sni_callback(
            &self,
            callback: Option<PyObjectRef>,
            vm: &VirtualMachine,
        ) -> PyResult<()> {
            // Validate callback is callable or None
            if let Some(ref cb) = callback
                && !cb.is(vm.ctx.types.none_type)
                && !cb.is_callable()
            {
                return Err(vm.new_type_error("sni_callback must be callable or None"));
            }
            *self.sni_callback.write() = callback;
            Ok(())
        }

        #[pymethod]
        fn set_servername_callback(