use std::future::Future;
use crate::defer;
use crate::{App, AppContext, Global, ReadGlobal, Task};
pub use tokio::runtime::Handle;
pub use tokio::task::JoinError;
pub fn init(cx: &mut App) {
let runtime = tokio::runtime::Builder::new_multi_thread()
.worker_threads(2)
.enable_all()
.build()
.expect("初始化 Tokio 失败");
let handle = runtime.handle().clone();
cx.set_global(GlobalTokio {
owned_runtime: Some(runtime),
handle,
});
}
pub fn init_from_handle(cx: &mut App, handle: tokio::runtime::Handle) {
cx.set_global(GlobalTokio {
owned_runtime: None,
handle,
});
}
struct GlobalTokio {
owned_runtime: Option<tokio::runtime::Runtime>,
handle: tokio::runtime::Handle,
}
impl Global for GlobalTokio {}
impl Drop for GlobalTokio {
fn drop(&mut self) {
if let Some(runtime) = self.owned_runtime.take() {
runtime.shutdown_background();
}
}
}
pub struct Tokio {}
impl Tokio {
pub fn spawn<C, Fut, R>(cx: &C, f: Fut) -> Task<Result<R, JoinError>>
where
C: AppContext,
Fut: Future<Output = R> + Send + 'static,
R: Send + 'static,
{
cx.read_global(|tokio: &GlobalTokio, cx| {
let join_handle = tokio.handle.spawn(f);
let abort_handle = join_handle.abort_handle();
let cancel = defer(move || {
abort_handle.abort();
});
cx.background_spawn(async move {
let result = join_handle.await;
drop(cancel);
result
})
})
}
pub fn spawn_result<C, Fut, R>(cx: &C, f: Fut) -> Task<anyhow::Result<R>>
where
C: AppContext,
Fut: Future<Output = anyhow::Result<R>> + Send + 'static,
R: Send + 'static,
{
cx.read_global(|tokio: &GlobalTokio, cx| {
let join_handle = tokio.handle.spawn(f);
let abort_handle = join_handle.abort_handle();
let cancel = defer(move || {
abort_handle.abort();
});
cx.background_spawn(async move {
let result = join_handle.await?;
drop(cancel);
result
})
})
}
pub fn handle(cx: &App) -> tokio::runtime::Handle {
GlobalTokio::global(cx).handle.clone()
}
}