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use async_trait::async_trait;
use executor_trait::{BlockingExecutor, Executor, LocalExecutorError, Task};
use std::{
future::Future,
pin::Pin,
task::{Context, Poll},
};
use tokio::runtime::Handle;
#[derive(Debug, Default, Clone)]
pub struct Tokio(Option<Handle>);
impl Tokio {
pub fn with_handle(mut self, handle: Handle) -> Self {
self.0 = Some(handle);
self
}
pub fn current() -> Self {
Self::default().with_handle(Handle::current())
}
}
struct TTask(tokio::task::JoinHandle<()>);
impl Executor for Tokio {
fn block_on(&self, f: Pin<Box<dyn Future<Output = ()>>>) {
tokio::runtime::Runtime::new()
.expect("failed to create runtime")
.block_on(f);
}
fn spawn(&self, f: Pin<Box<dyn Future<Output = ()> + Send>>) -> Box<dyn Task> {
Box::new(TTask(if let Some(handle) = self.0.as_ref() {
handle.spawn(f)
} else {
tokio::task::spawn(f)
}))
}
fn spawn_local(&self, f: Pin<Box<dyn Future<Output = ()>>>) -> Result<Box<dyn Task>, LocalExecutorError> {
Err(LocalExecutorError(f))
}
}
#[async_trait]
impl BlockingExecutor for Tokio {
async fn spawn_blocking(&self, f: Box<dyn FnOnce() + Send + 'static>) {
if let Some(handle) = self.0.as_ref() {
handle.spawn_blocking(f).await
} else {
tokio::task::spawn_blocking(f).await
}
.expect("blocking task failed");
}
}
#[async_trait(?Send)]
impl Task for TTask {
async fn cancel(self: Box<Self>) -> Option<()> {
self.0.abort();
self.0.await.ok()
}
}
impl Future for TTask {
type Output = ();
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
match Pin::new(&mut self.0).poll(cx) {
Poll::Pending => Poll::Pending,
Poll::Ready(res) => Poll::Ready(res.expect("task has been canceled")),
}
}
}