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|
//! Listen and react to time.
use crate::subscription::{self, Subscription};
/// Returns a [`Subscription`] that produces messages at a set interval.
///
/// The first message is produced after a `duration`, and then continues to
/// produce more messages every `duration` after that.
pub fn every<H: std::hash::Hasher, E>(
duration: std::time::Duration,
) -> Subscription<H, E, std::time::Instant> {
Subscription::from_recipe(Every(duration))
}
struct Every(std::time::Duration);
#[cfg(feature = "async-std")]
impl<H, E> subscription::Recipe<H, E> for Every
where
H: std::hash::Hasher,
{
type Output = std::time::Instant;
fn hash(&self, state: &mut H) {
use std::hash::Hash;
std::any::TypeId::of::<Self>().hash(state);
self.0.hash(state);
}
fn stream(
self: Box<Self>,
_input: futures::stream::BoxStream<'static, E>,
) -> futures::stream::BoxStream<'static, Self::Output> {
use futures::stream::StreamExt;
async_std::stream::interval(self.0)
.map(|_| std::time::Instant::now())
.boxed()
}
}
#[cfg(all(
any(feature = "tokio", feature = "tokio_old"),
not(feature = "async-std")
))]
impl<H, E> subscription::Recipe<H, E> for Every
where
H: std::hash::Hasher,
{
type Output = std::time::Instant;
fn hash(&self, state: &mut H) {
use std::hash::Hash;
std::any::TypeId::of::<Self>().hash(state);
self.0.hash(state);
}
fn stream(
self: Box<Self>,
_input: futures::stream::BoxStream<'static, E>,
) -> futures::stream::BoxStream<'static, Self::Output> {
use futures::stream::StreamExt;
#[cfg(feature = "tokio_old")]
use tokio_old as tokio;
let start = tokio::time::Instant::now() + self.0;
let stream = {
#[cfg(feature = "tokio")]
{
futures::stream::unfold(
tokio::time::interval_at(start, self.0),
|mut interval| async move {
Some((interval.tick().await, interval))
},
)
}
#[cfg(feature = "tokio_old")]
tokio::time::interval_at(start, self.0)
};
stream.map(|_| std::time::Instant::now()).boxed()
}
}
|
