mirror of https://github.com/stjepang/smol
145 lines
4.2 KiB
Rust
145 lines
4.2 KiB
Rust
//! An HTTP+TLS client 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-client
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//! ```
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use std::convert::TryInto;
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use std::pin::Pin;
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use std::task::{Context, Poll};
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use anyhow::{bail, Context as _, Result};
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use async_native_tls::TlsStream;
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use http_body_util::{BodyStream, Empty};
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use hyper::body::Incoming;
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use hyper::{Request, Response};
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use macro_rules_attribute::apply;
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use smol::{io, net::TcpStream, prelude::*, Executor};
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use smol_hyper::rt::FuturesIo;
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use smol_macros::main;
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/// Sends a request and fetches the response.
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async fn fetch(
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ex: &Executor<'static>,
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req: Request<Empty<&'static [u8]>>,
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) -> Result<Response<Incoming>> {
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// Connect to the HTTP server.
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let io = {
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let host = req.uri().host().context("cannot parse host")?;
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match req.uri().scheme_str() {
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Some("http") => {
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let stream = {
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let port = req.uri().port_u16().unwrap_or(80);
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TcpStream::connect((host, port)).await?
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};
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SmolStream::Plain(stream)
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}
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Some("https") => {
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// In case of HTTPS, establish a secure TLS connection first.
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let stream = {
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let port = req.uri().port_u16().unwrap_or(443);
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TcpStream::connect((host, port)).await?
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};
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let stream = async_native_tls::connect(host, stream).await?;
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SmolStream::Tls(stream)
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}
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scheme => bail!("unsupported scheme: {:?}", scheme),
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}
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};
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// Spawn the HTTP/1 connection.
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let (mut sender, conn) = hyper::client::conn::http1::handshake(FuturesIo::new(io)).await?;
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ex.spawn(async move {
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if let Err(e) = conn.await {
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println!("Connection failed: {:?}", e);
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}
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})
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.detach();
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// Get the result
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let result = sender.send_request(req).await?;
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Ok(result)
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}
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#[apply(main!)]
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async fn main(ex: &Executor<'static>) -> Result<()> {
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// Create a request.
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let url: hyper::Uri = "https://www.rust-lang.org".try_into()?;
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let req = Request::builder()
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.header(
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hyper::header::HOST,
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url.authority().unwrap().clone().as_str(),
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)
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.uri(url)
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.body(Empty::new())?;
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// Fetch the response.
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let resp = fetch(ex, req).await?;
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println!("{:#?}", resp);
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// Read the message body.
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let body: Vec<u8> = BodyStream::new(resp.into_body())
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.try_fold(Vec::new(), |mut body, chunk| {
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if let Some(chunk) = chunk.data_ref() {
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body.extend_from_slice(chunk);
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}
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Ok(body)
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})
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.await?;
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println!("{}", String::from_utf8_lossy(&body));
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Ok(())
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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(TcpStream),
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/// A TCP connection secured by TLS.
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Tls(TlsStream<TcpStream>),
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}
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impl 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 [u8],
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) -> Poll<io::Result<usize>> {
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match &mut *self {
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SmolStream::Plain(stream) => Pin::new(stream).poll_read(cx, buf),
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SmolStream::Tls(stream) => Pin::new(stream).poll_read(cx, buf),
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}
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}
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}
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impl 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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match &mut *self {
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SmolStream::Plain(stream) => Pin::new(stream).poll_write(cx, buf),
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SmolStream::Tls(stream) => Pin::new(stream).poll_write(cx, buf),
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}
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}
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fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
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match &mut *self {
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SmolStream::Plain(stream) => Pin::new(stream).poll_close(cx),
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SmolStream::Tls(stream) => Pin::new(stream).poll_close(cx),
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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(stream) => Pin::new(stream).poll_flush(cx),
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SmolStream::Tls(stream) => Pin::new(stream).poll_flush(cx),
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}
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}
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}
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