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use crate::{channels::Channels, Result};
use parking_lot::Mutex;
use std::{
fmt,
sync::Arc,
time::{Duration, Instant},
};
#[derive(Clone)]
pub struct Heartbeat {
channels: Channels,
inner: Arc<Mutex<Inner>>,
}
impl Heartbeat {
pub(crate) fn new(channels: Channels) -> Self {
let inner = Default::default();
Self { channels, inner }
}
pub(crate) fn set_timeout(&self, timeout: Duration) {
self.inner.lock().timeout = Some(timeout);
}
pub fn get_heartbeat(&self) -> Option<Duration> {
self.inner.lock().timeout
}
pub fn poll_timeout(&self) -> Result<Option<Duration>> {
self.inner.lock().poll_timeout(&self.channels)
}
pub fn send(&self) -> Result<()> {
self.channels.send_heartbeat()
}
pub(crate) fn update_last_write(&self) {
self.inner.lock().update_last_write();
}
pub(crate) fn cancel(&self) {
self.inner.lock().timeout = None;
}
}
impl fmt::Debug for Heartbeat {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Heartbeat").finish()
}
}
struct Inner {
last_write: Instant,
timeout: Option<Duration>,
}
impl Default for Inner {
fn default() -> Self {
Self {
last_write: Instant::now(),
timeout: None,
}
}
}
impl Inner {
fn poll_timeout(&mut self, channels: &Channels) -> Result<Option<Duration>> {
self.timeout
.map(|timeout| {
timeout
.checked_sub(self.last_write.elapsed())
.map(Ok)
.unwrap_or_else(|| {
self.update_last_write();
channels.send_heartbeat()?;
Ok(timeout)
})
})
.transpose()
}
fn update_last_write(&mut self) {
self.last_write = Instant::now();
}
}