mirror of https://github.com/smol-rs/smol
210 lines
6.6 KiB
Rust
210 lines
6.6 KiB
Rust
//! An HTTP+TLS server based on `hyper` and `async-native-tls`.
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//!
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//! Run with:
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//!
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//! ```
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//! cargo run --example hyper-server
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//! ```
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//!
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//! Open in the browser any of these addresses:
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//!
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//! - http://localhost:8000/
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//! - https://localhost:8001/ (accept the security prompt in the browser)
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//!
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//! Refer to `README.md` to see how to the TLS certificate was generated.
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use std::net::{Shutdown, TcpListener, TcpStream};
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use std::pin::Pin;
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use std::task::{Context, Poll};
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use anyhow::{Error, Result};
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use async_native_tls::{Identity, TlsAcceptor, TlsStream};
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use hyper::service::{make_service_fn, service_fn};
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use hyper::{Body, Request, Response, Server};
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use smol::{future, io, prelude::*, Async};
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/// Serves a request and returns a response.
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async fn serve(req: Request<Body>, host: String) -> Result<Response<Body>> {
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println!("Serving {}{}", host, req.uri());
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Ok(Response::new(Body::from("Hello from hyper!")))
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}
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/// Listens for incoming connections and serves them.
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async fn listen(listener: Async<TcpListener>, tls: Option<TlsAcceptor>) -> Result<()> {
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// Format the full host address.
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let host = &match tls {
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None => format!("http://{}", listener.get_ref().local_addr()?),
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Some(_) => format!("https://{}", listener.get_ref().local_addr()?),
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};
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println!("Listening on {}", host);
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// Start a hyper server.
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Server::builder(SmolListener::new(&listener, tls))
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.executor(SmolExecutor)
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.serve(make_service_fn(move |_| {
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let host = host.clone();
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async { Ok::<_, Error>(service_fn(move |req| serve(req, host.clone()))) }
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}))
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.await?;
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Ok(())
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}
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fn main() -> Result<()> {
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// Initialize TLS with the local certificate, private key, and password.
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let identity = Identity::from_pkcs12(include_bytes!("identity.pfx"), "password")?;
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let tls = TlsAcceptor::from(native_tls::TlsAcceptor::new(identity)?);
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// Start HTTP and HTTPS servers.
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smol::block_on(async {
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let http = listen(Async::<TcpListener>::bind(([127, 0, 0, 1], 8000))?, None);
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let https = listen(
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Async::<TcpListener>::bind(([127, 0, 0, 1], 8001))?,
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Some(tls),
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);
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future::try_zip(http, https).await?;
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Ok(())
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})
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}
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/// Spawns futures.
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#[derive(Clone)]
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struct SmolExecutor;
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impl<F: Future + Send + 'static> hyper::rt::Executor<F> for SmolExecutor {
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fn execute(&self, fut: F) {
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smol::spawn(async { drop(fut.await) }).detach();
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}
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}
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/// Listens for incoming connections.
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struct SmolListener<'a> {
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tls: Option<TlsAcceptor>,
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incoming: Pin<Box<dyn Stream<Item = io::Result<Async<TcpStream>>> + Send + 'a>>,
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}
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impl<'a> SmolListener<'a> {
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fn new(listener: &'a Async<TcpListener>, tls: Option<TlsAcceptor>) -> Self {
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Self {
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incoming: Box::pin(listener.incoming()),
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tls,
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}
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}
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}
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impl hyper::server::accept::Accept for SmolListener<'_> {
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type Conn = SmolStream;
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type Error = Error;
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fn poll_accept(
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mut self: Pin<&mut Self>,
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cx: &mut Context,
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) -> Poll<Option<Result<Self::Conn, Self::Error>>> {
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let stream = smol::ready!(self.incoming.as_mut().poll_next(cx)).unwrap()?;
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let stream = match &self.tls {
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None => SmolStream::Plain(stream),
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Some(tls) => {
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// In case of HTTPS, start establishing a secure TLS connection.
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let tls = tls.clone();
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SmolStream::Handshake(Box::pin(async move {
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tls.accept(stream).await.map_err(|err| {
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println!("Failed to establish secure TLS connection: {:#?}", err);
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io::Error::new(io::ErrorKind::Other, Box::new(err))
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})
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}))
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}
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};
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Poll::Ready(Some(Ok(stream)))
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}
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}
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/// A TCP or TCP+TLS connection.
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enum SmolStream {
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/// A plain TCP connection.
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Plain(Async<TcpStream>),
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/// A TCP connection secured by TLS.
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Tls(TlsStream<Async<TcpStream>>),
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/// A TCP connection that is in process of getting secured by TLS.
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#[allow(clippy::type_complexity)]
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Handshake(Pin<Box<dyn Future<Output = io::Result<TlsStream<Async<TcpStream>>>> + Send>>),
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}
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impl hyper::client::connect::Connection for SmolStream {
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fn connected(&self) -> hyper::client::connect::Connected {
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hyper::client::connect::Connected::new()
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}
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}
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impl tokio::io::AsyncRead for SmolStream {
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fn poll_read(
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mut self: Pin<&mut Self>,
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cx: &mut Context<'_>,
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buf: &mut tokio::io::ReadBuf<'_>,
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) -> Poll<io::Result<()>> {
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loop {
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match &mut *self {
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SmolStream::Plain(s) => {
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return Pin::new(s)
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.poll_read(cx, buf.initialize_unfilled())
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.map_ok(|size| {
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buf.advance(size);
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});
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}
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SmolStream::Tls(s) => {
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return Pin::new(s)
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.poll_read(cx, buf.initialize_unfilled())
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.map_ok(|size| {
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buf.advance(size);
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});
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}
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SmolStream::Handshake(f) => {
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let s = smol::ready!(f.as_mut().poll(cx))?;
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*self = SmolStream::Tls(s);
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}
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}
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}
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}
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}
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impl tokio::io::AsyncWrite for SmolStream {
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fn poll_write(
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mut self: Pin<&mut Self>,
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cx: &mut Context<'_>,
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buf: &[u8],
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) -> Poll<io::Result<usize>> {
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loop {
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match &mut *self {
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SmolStream::Plain(s) => return Pin::new(s).poll_write(cx, buf),
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SmolStream::Tls(s) => return Pin::new(s).poll_write(cx, buf),
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SmolStream::Handshake(f) => {
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let s = smol::ready!(f.as_mut().poll(cx))?;
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*self = SmolStream::Tls(s);
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}
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}
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}
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}
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fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
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match &mut *self {
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SmolStream::Plain(s) => Pin::new(s).poll_flush(cx),
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SmolStream::Tls(s) => Pin::new(s).poll_flush(cx),
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SmolStream::Handshake(_) => Poll::Ready(Ok(())),
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}
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}
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fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
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match &mut *self {
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SmolStream::Plain(s) => {
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s.get_ref().shutdown(Shutdown::Write)?;
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Poll::Ready(Ok(()))
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}
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SmolStream::Tls(s) => Pin::new(s).poll_close(cx),
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SmolStream::Handshake(_) => Poll::Ready(Ok(())),
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}
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}
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}
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