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use futures::{Future, FutureExt};
use pin_project::pin_project;
use std::{pin::Pin, task::Poll};
#[derive(Clone)]
pub enum Executor {
#[cfg(feature = "tokio")]
Tokio,
#[cfg(feature = "async_global")]
AsyncGlobal,
}
impl Executor {
#[allow(unreachable_code)]
pub fn new() -> Self {
#[cfg(feature = "async_global")]
return Self::AsyncGlobal;
#[cfg(feature = "tokio")]
return Self::Tokio;
}
pub fn spawn<F: Future<Output = T> + Send + 'static, T: Send + 'static>(
&self,
future: F,
) -> JoinHandle<T> {
match self {
#[cfg(feature = "async_global")]
Self::AsyncGlobal => {
let task = async_global_executor::spawn(future);
JoinHandle::AsyncGlobal(Some(task))
}
#[cfg(feature = "tokio")]
Self::Tokio => {
let task = tokio_crate::spawn(future);
JoinHandle::Tokio(task)
}
}
}
pub fn spawn_blocking<Fun: FnOnce() -> T + Send + 'static, T: Send + 'static>(
&self,
f: Fun,
) -> JoinHandle<T> {
match self {
#[cfg(feature = "async_global")]
Self::AsyncGlobal => {
let task = async_global_executor::spawn(async_global_executor::spawn_blocking(f));
JoinHandle::AsyncGlobal(Some(task))
}
#[cfg(feature = "tokio")]
Self::Tokio => {
let task = tokio_crate::task::spawn_blocking(f);
JoinHandle::Tokio(task)
}
}
}
}
impl Default for Executor {
fn default() -> Self {
Self::new()
}
}
#[pin_project(project = EnumProj)]
pub enum JoinHandle<T> {
#[cfg(feature = "tokio")]
Tokio(tokio_crate::task::JoinHandle<T>),
#[cfg(feature = "async_global")]
AsyncGlobal(Option<async_global_executor::Task<T>>),
}
impl<T> JoinHandle<T> {
#[allow(unused_mut)]
pub fn detach(mut self) {
#[cfg(feature = "async_global")]
if let Self::AsyncGlobal(Some(t)) = self {
t.detach()
}
}
#[allow(unused_mut)]
pub fn abort(mut self) {
#[cfg(all(feature = "tokio", not(feature = "async_global")))]
{
let Self::Tokio(t) = self;
t.abort()
}
}
}
impl<T> Future for JoinHandle<T> {
type Output = anyhow::Result<T>;
fn poll(self: Pin<&mut Self>, cx: &mut std::task::Context<'_>) -> Poll<Self::Output> {
let this = self.project();
match this {
#[cfg(feature = "tokio")]
EnumProj::Tokio(j) => match j.poll_unpin(cx) {
Poll::Ready(t) => {
use anyhow::Context;
Poll::Ready(t.context("tokio::task::JoinHandle Error"))
}
Poll::Pending => Poll::Pending,
},
#[cfg(feature = "async_global")]
EnumProj::AsyncGlobal(h) => {
if let Some(handle) = h {
match handle.poll_unpin(cx) {
Poll::Ready(r) => Poll::Ready(Ok(r)),
_ => Poll::Pending,
}
} else {
Poll::Ready(Err(anyhow::anyhow!("Future detached")))
}
}
}
}
}
#[cfg(test)]
mod test {
use crate::{Config, DefaultParams, Ipfs};
use libp2p::identity::ed25519::Keypair;
use tempdir::TempDir;
#[test]
fn should_work_with_async_global_per_default() {
use futures::executor::block_on;
let tmp = TempDir::new("ipfs-embed").unwrap();
block_on(Ipfs::<DefaultParams>::new(Config::new(
tmp.path(),
Keypair::generate(),
)))
.unwrap();
}
#[cfg(feature = "tokio")]
#[test]
#[should_panic(
expected = "no reactor running, must be called from the context of a Tokio 1.x runtime"
)]
fn should_panic_without_a_tokio_runtime() {
use futures::executor::block_on;
let tmp = TempDir::new("ipfs-embed").unwrap();
let _ = block_on(Ipfs::<DefaultParams>::new0(
Config::new(tmp.path(), Keypair::generate()),
crate::Executor::Tokio,
));
}
#[cfg(feature = "tokio")]
#[test]
fn should_not_panic_with_a_tokio_runtime() {
let tmp = TempDir::new("ipfs-embed").unwrap();
let rt = tokio_crate::runtime::Builder::new_current_thread()
.build()
.unwrap();
rt.block_on(Ipfs::<DefaultParams>::new0(
Config::new(tmp.path(), Keypair::generate()),
crate::Executor::Tokio,
))
.unwrap();
}
}