Implement more/continues and friends

[haraldh]

@haraldh Thanks for the quick response.

Introspection works now, thanks! However, I noticed that the metadata in requests and responses does not work in async mode (For example, the more flag in requests or the continues flag in the reply).

This makes it unusable for our use case.

I roughly checked the code, and it seems like the async impl. explicitly sets these to false or to an empty implementation, while the sync implementation uses the trait defaults. Is there any reason for this?

impl varlink::CallTrait for AsyncCall {
    fn reply_struct(&mut self, reply: varlink::Reply) -> varlink::Result<()> {
        self.reply = Some(reply);
        Ok(())
    }
    fn set_continues(&mut self, _cont: bool) {}
    fn to_upgraded(&mut self) {}
    fn is_oneway(&self) -> bool {
        false
    }
    fn wants_more(&self) -> bool {
        false
    }
    fn get_request(&self) -> Option<&varlink::Request<'_>> {
        None
    }
}

Regards,
Philipp

Originally posted by @PhilippMeyerWeidmueller in #138