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use crate::{message::BasicReturnMessage, returned_messages::ReturnedMessages, Promise, Result}; use log::trace; use std::{ future::Future, pin::Pin, task::{Context, Poll}, }; #[derive(Debug)] pub struct PublisherConfirm { inner: Option<Promise<Confirmation>>, returned_messages: ReturnedMessages, used: bool, } #[derive(Clone, Debug, PartialEq)] pub enum Confirmation { Ack(Option<Box<BasicReturnMessage>>), Nack(Option<Box<BasicReturnMessage>>), NotRequested, } impl Confirmation { pub fn take_message(self) -> Option<BasicReturnMessage> { if let Confirmation::Ack(Some(msg)) | Confirmation::Nack(Some(msg)) = self { Some(*msg) } else { None } } pub fn is_ack(&self) -> bool { if let Confirmation::Ack(_) = self { true } else { false } } pub fn is_nack(&self) -> bool { if let Confirmation::Nack(_) = self { true } else { false } } } impl PublisherConfirm { pub(crate) fn new(inner: Promise<Confirmation>, returned_messages: ReturnedMessages) -> Self { Self { inner: Some(inner), returned_messages, used: false, } } pub(crate) fn not_requested(returned_messages: ReturnedMessages) -> Self { Self { inner: Some(Promise::new_with_data(Ok(Confirmation::NotRequested))), returned_messages, used: false, } } pub fn try_wait(&mut self) -> Option<Result<Confirmation>> { let confirmation = self .inner .as_ref() .expect("inner should only be None after Drop") .try_wait()?; self.used = true; Some(confirmation) } pub fn wait(&mut self) -> Result<Confirmation> { self.used = true; self.inner .as_ref() .expect("inner should only be None after Drop") .wait() } } impl Future for PublisherConfirm { type Output = Result<Confirmation>; fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { let mut this = self.as_mut(); let res = Pin::new( &mut this .inner .as_mut() .expect("inner should only be None ater Drop"), ) .poll(cx); if res.is_ready() { this.used = true; } res } } impl Drop for PublisherConfirm { fn drop(&mut self) { if !self.used { if let Some(promise) = self.inner.take() { trace!( "PublisherConfirm dropped without use, registering it for wait_for_confirms" ); self.returned_messages.register_dropped_confirm(promise); } } } }