60 lines
1.6 KiB
Rust
60 lines
1.6 KiB
Rust
//! An `async-std` backend.
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use futures::Future;
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/// An `async-std` executor.
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#[derive(Debug)]
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pub struct Executor;
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impl crate::Executor for Executor {
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fn new() -> Result<Self, futures::io::Error> {
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Ok(Self)
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}
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#[allow(clippy::let_underscore_future)]
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fn spawn(&self, future: impl Future<Output = ()> + Send + 'static) {
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let _ = async_std::task::spawn(future);
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}
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}
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pub mod time {
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//! Listen and react to time.
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use crate::subscription::{self, Subscription};
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/// Returns a [`Subscription`] that produces messages at a set interval.
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///
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/// The first message is produced after a `duration`, and then continues to
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/// produce more messages every `duration` after that.
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pub fn every<H: std::hash::Hasher, E>(
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duration: std::time::Duration,
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) -> Subscription<H, E, std::time::Instant> {
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Subscription::from_recipe(Every(duration))
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}
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#[derive(Debug)]
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struct Every(std::time::Duration);
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impl<H, E> subscription::Recipe<H, E> for Every
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where
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H: std::hash::Hasher,
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{
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type Output = std::time::Instant;
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fn hash(&self, state: &mut H) {
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use std::hash::Hash;
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std::any::TypeId::of::<Self>().hash(state);
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self.0.hash(state);
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}
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fn stream(
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self: Box<Self>,
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_input: futures::stream::BoxStream<'static, E>,
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) -> futures::stream::BoxStream<'static, Self::Output> {
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use futures::stream::StreamExt;
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async_std::stream::interval(self.0)
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.map(|_| std::time::Instant::now())
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.boxed()
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}
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}
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}
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