//! A `tokio` backend. use futures::Future; /// A `tokio` executor. pub type Executor = tokio::runtime::Runtime; impl crate::Executor for Executor { fn new() -> Result { tokio::runtime::Runtime::new() } #[allow(clippy::let_underscore_future)] fn spawn(&self, future: impl Future + Send + 'static) { let _ = tokio::runtime::Runtime::spawn(self, future); } fn enter(&self, f: impl FnOnce() -> R) -> R { let _guard = tokio::runtime::Runtime::enter(self); f() } } pub mod time { //! Listen and react to time. use crate::subscription::{self, Hasher, 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( duration: std::time::Duration, ) -> Subscription { Subscription::from_recipe(Every(duration)) } #[derive(Debug)] struct Every(std::time::Duration); impl subscription::Recipe for Every { type Output = std::time::Instant; fn hash(&self, state: &mut Hasher) { use std::hash::Hash; std::any::TypeId::of::().hash(state); self.0.hash(state); } fn stream( self: Box, _input: subscription::EventStream, ) -> futures::stream::BoxStream<'static, Self::Output> { use futures::stream::StreamExt; let start = tokio::time::Instant::now() + self.0; let stream = { futures::stream::unfold( tokio::time::interval_at(start, self.0), |mut interval| async move { Some((interval.tick().await, interval)) }, ) }; stream.map(tokio::time::Instant::into_std).boxed() } } }