use crate::protocol::FloodsubMessage;
use crate::Topic;
use futures::channel::mpsc;
use futures::StreamExt;
use std::fmt;
use std::sync::Arc;
#[derive(Clone, Copy, Debug, Eq, PartialOrd, Ord)]
pub struct SubId(u32);
impl SubId {
pub(crate) fn random() -> Self {
SubId(rand::random())
}
}
impl fmt::Display for SubId {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.0)
}
}
impl PartialEq for SubId {
fn eq(&self, other: &Self) -> bool {
self.0 == other.0
}
}
impl std::hash::Hash for SubId {
fn hash<H: std::hash::Hasher>(&self, hasher: &mut H) {
hasher.write_u32(self.0);
}
}
impl nohash_hasher::IsEnabled for SubId {}
pub struct Subscription {
id: SubId,
topic: Topic,
rx: mpsc::UnboundedReceiver<Arc<FloodsubMessage>>,
cancel: mpsc::UnboundedSender<(Topic, SubId)>,
}
impl Subscription {
pub fn new(
id: SubId,
topic: Topic,
rx: mpsc::UnboundedReceiver<Arc<FloodsubMessage>>,
cancel: mpsc::UnboundedSender<(Topic, SubId)>,
) -> Self {
Subscription { id, topic, rx, cancel }
}
pub async fn next(&mut self) -> Option<Arc<FloodsubMessage>> {
self.rx.next().await
}
pub fn cancel(&self) {
let _ = self.cancel.unbounded_send((self.topic.clone(), self.id));
}
}
impl Drop for Subscription {
fn drop(&mut self) {
let _ = self.cancel.unbounded_send((self.topic.clone(), self.id));
}
}