This is a simple example showing how to run hyper on async-std.
Add async-std, hyper, and tokio as dependencies to your crate:
[dependencies]
async-std = "1"
hyper = { version = "0.13", default-features = false }
tokio = { version = "0.2", default-features = false }Copy this compat module into your crate:
pub mod compat {
use std::pin::Pin;
use std::task::{Context, Poll};
use async_std::io;
use async_std::net::{TcpListener, TcpStream};
use async_std::prelude::*;
use async_std::task;
#[derive(Clone)]
pub struct HyperExecutor;
impl<F> hyper::rt::Executor<F> for HyperExecutor
where
F: Future + Send + 'static,
F::Output: Send + 'static,
{
fn execute(&self, fut: F) {
task::spawn(fut);
}
}
pub struct HyperListener(pub TcpListener);
impl hyper::server::accept::Accept for HyperListener {
type Conn = HyperStream;
type Error = io::Error;
fn poll_accept(
mut self: Pin<&mut Self>,
cx: &mut Context,
) -> Poll<Option<Result<Self::Conn, Self::Error>>> {
let stream = task::ready!(Pin::new(&mut self.0.incoming()).poll_next(cx)).unwrap()?;
Poll::Ready(Some(Ok(HyperStream(stream))))
}
}
pub struct HyperStream(pub TcpStream);
impl tokio::io::AsyncRead for HyperStream {
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut Context,
buf: &mut [u8],
) -> Poll<io::Result<usize>> {
Pin::new(&mut self.0).poll_read(cx, buf)
}
}
impl tokio::io::AsyncWrite for HyperStream {
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut Context,
buf: &[u8],
) -> Poll<io::Result<usize>> {
Pin::new(&mut self.0).poll_write(cx, buf)
}
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
Pin::new(&mut self.0).poll_flush(cx)
}
fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
Pin::new(&mut self.0).poll_close(cx)
}
}
}Configure the hyper builder with:
let server = Server::builder(compat::HyperListener(listener))
.executor(compat::Executor);Full example:
use std::convert::Infallible;
use async_std::net::TcpListener;
use async_std::task;
use hyper::service::{make_service_fn, service_fn};
use hyper::{Body, Request, Response, Server};
use compat; // This is the module from Step 2.
async fn hello(_: Request<Body>) -> Result<Response<Body>, Infallible> {
Ok(Response::new(Body::from("Hello World!")))
}
fn main() -> Result<(), Box<dyn std::error::Error>> {
task::block_on(async {
let addr = "127.0.0.1:3000";
let listener = TcpListener::bind(addr).await?;
let make_svc = make_service_fn(|_conn| async { Ok::<_, Infallible>(service_fn(hello)) });
let server = Server::builder(compat::HyperListener(listener))
.executor(compat::HyperExecutor)
.serve(make_svc);
println!("Listening on http://{}", addr);
server.await?;
Ok(())
})
}Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
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