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single_threaded.rs
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383 lines (324 loc) · 11.5 KB
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#![deny(warnings)]
/// This example shows how to use hyper with a single-threaded runtime.
/// This example exists also to test if the code compiles when `Body` is not `Send`.
///
/// This Example includes HTTP/1 and HTTP/2 server and client.
///
/// In HTTP/1 it is possible to use a `!Send` `Body`type.
/// In HTTP/2 it is possible to use a `!Send` `Body` and `IO` type.
///
/// The `Body` and `IOTypeNotSend` structs in this example are `!Send`
///
/// For HTTP/2 this only works if the `Executor` trait is implemented without the `Send` bound.
use http_body_util::BodyExt;
use hyper::server::conn::http2;
use std::cell::Cell;
use std::net::SocketAddr;
use std::rc::Rc;
use tokio::io::{self, AsyncWriteExt};
use tokio::net::TcpListener;
use hyper::body::{Body as HttpBody, Bytes, Frame};
use hyper::service::service_fn;
use hyper::Request;
use hyper::{Error, Response};
use std::marker::PhantomData;
use std::pin::Pin;
use std::task::{Context, Poll};
use std::thread;
use tokio::net::TcpStream;
#[path = "../benches/support/mod.rs"]
mod support;
use support::TokioIo;
struct Body {
// Our Body type is !Send and !Sync:
_marker: PhantomData<*const ()>,
data: Option<Bytes>,
}
impl From<String> for Body {
fn from(a: String) -> Self {
Body {
_marker: PhantomData,
data: Some(a.into()),
}
}
}
impl HttpBody for Body {
type Data = Bytes;
type Error = Error;
fn poll_frame(
self: Pin<&mut Self>,
_: &mut Context<'_>,
) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>> {
Poll::Ready(self.get_mut().data.take().map(|d| Ok(Frame::data(d))))
}
}
fn main() {
pretty_env_logger::init();
let server_http2 = thread::spawn(move || {
// Configure a runtime for the server that runs everything on the current thread
let rt = tokio::runtime::Builder::new_current_thread()
.enable_all()
.build()
.expect("build runtime");
// Combine it with a `LocalSet, which means it can spawn !Send futures...
let local = tokio::task::LocalSet::new();
local.block_on(&rt, http2_server()).unwrap();
});
let client_http2 = thread::spawn(move || {
// Configure a runtime for the client that runs everything on the current thread
let rt = tokio::runtime::Builder::new_current_thread()
.enable_all()
.build()
.expect("build runtime");
// Combine it with a `LocalSet, which means it can spawn !Send futures...
let local = tokio::task::LocalSet::new();
local
.block_on(
&rt,
http2_client("http://localhost:3000".parse::<hyper::Uri>().unwrap()),
)
.unwrap();
});
let server_http1 = thread::spawn(move || {
// Configure a runtime for the server that runs everything on the current thread
let rt = tokio::runtime::Builder::new_current_thread()
.enable_all()
.build()
.expect("build runtime");
// Combine it with a `LocalSet, which means it can spawn !Send futures...
let local = tokio::task::LocalSet::new();
local.block_on(&rt, http1_server()).unwrap();
});
let client_http1 = thread::spawn(move || {
// Configure a runtime for the client that runs everything on the current thread
let rt = tokio::runtime::Builder::new_current_thread()
.enable_all()
.build()
.expect("build runtime");
// Combine it with a `LocalSet, which means it can spawn !Send futures...
let local = tokio::task::LocalSet::new();
local
.block_on(
&rt,
http1_client("http://localhost:3001".parse::<hyper::Uri>().unwrap()),
)
.unwrap();
});
server_http2.join().unwrap();
client_http2.join().unwrap();
server_http1.join().unwrap();
client_http1.join().unwrap();
}
async fn http1_server() -> Result<(), Box<dyn std::error::Error>> {
let addr = SocketAddr::from(([127, 0, 0, 1], 3001));
let listener = TcpListener::bind(addr).await?;
// For each connection, clone the counter to use in our service...
let counter = Rc::new(Cell::new(0));
loop {
let (stream, _) = listener.accept().await?;
let io = IOTypeNotSend::new(TokioIo::new(stream));
let cnt = counter.clone();
let service = service_fn(move |_| {
let prev = cnt.get();
cnt.set(prev + 1);
let value = cnt.get();
async move { Ok::<_, Error>(Response::new(Body::from(format!("Request #{}", value)))) }
});
tokio::task::spawn_local(async move {
if let Err(err) = hyper::server::conn::http1::Builder::new()
.serve_connection(io, service)
.await
{
println!("Error serving connection: {:?}", err);
}
});
}
}
async fn http1_client(url: hyper::Uri) -> Result<(), Box<dyn std::error::Error>> {
let host = url.host().expect("uri has no host");
let port = url.port_u16().unwrap_or(80);
let addr = format!("{}:{}", host, port);
let stream = TcpStream::connect(addr).await?;
let io = IOTypeNotSend::new(TokioIo::new(stream));
let (mut sender, conn) = hyper::client::conn::http1::handshake(io).await?;
tokio::task::spawn_local(async move {
if let Err(err) = conn.await {
let mut stdout = io::stdout();
stdout
.write_all(format!("Connection failed: {:?}", err).as_bytes())
.await
.unwrap();
stdout.flush().await.unwrap();
}
});
let authority = url.authority().unwrap().clone();
// Make 4 requests
for _ in 0..4 {
let req = Request::builder()
.uri(url.clone())
.header(hyper::header::HOST, authority.as_str())
.body(Body::from("test".to_string()))?;
let mut res = sender.send_request(req).await?;
let mut stdout = io::stdout();
stdout
.write_all(format!("Response: {}\n", res.status()).as_bytes())
.await
.unwrap();
stdout
.write_all(format!("Headers: {:#?}\n", res.headers()).as_bytes())
.await
.unwrap();
stdout.flush().await.unwrap();
// Print the response body
while let Some(next) = res.frame().await {
let frame = next?;
if let Some(chunk) = frame.data_ref() {
stdout.write_all(chunk).await.unwrap();
}
}
stdout.write_all(b"\n-----------------\n").await.unwrap();
stdout.flush().await.unwrap();
}
Ok(())
}
async fn http2_server() -> Result<(), Box<dyn std::error::Error>> {
let mut stdout = io::stdout();
let addr: SocketAddr = ([127, 0, 0, 1], 3000).into();
// Using a !Send request counter is fine on 1 thread...
let counter = Rc::new(Cell::new(0));
let listener = TcpListener::bind(addr).await?;
stdout
.write_all(format!("Listening on http://{}", addr).as_bytes())
.await
.unwrap();
stdout.flush().await.unwrap();
loop {
let (stream, _) = listener.accept().await?;
let io = IOTypeNotSend::new(TokioIo::new(stream));
// For each connection, clone the counter to use in our service...
let cnt = counter.clone();
let service = service_fn(move |_| {
let prev = cnt.get();
cnt.set(prev + 1);
let value = cnt.get();
async move { Ok::<_, Error>(Response::new(Body::from(format!("Request #{}", value)))) }
});
tokio::task::spawn_local(async move {
if let Err(err) = http2::Builder::new(LocalExec)
.serve_connection(io, service)
.await
{
let mut stdout = io::stdout();
stdout
.write_all(format!("Error serving connection: {:?}", err).as_bytes())
.await
.unwrap();
stdout.flush().await.unwrap();
}
});
}
}
async fn http2_client(url: hyper::Uri) -> Result<(), Box<dyn std::error::Error>> {
let host = url.host().expect("uri has no host");
let port = url.port_u16().unwrap_or(80);
let addr = format!("{}:{}", host, port);
let stream = TcpStream::connect(addr).await?;
let stream = IOTypeNotSend::new(TokioIo::new(stream));
let (mut sender, conn) = hyper::client::conn::http2::handshake(LocalExec, stream).await?;
tokio::task::spawn_local(async move {
if let Err(err) = conn.await {
let mut stdout = io::stdout();
stdout
.write_all(format!("Connection failed: {:?}", err).as_bytes())
.await
.unwrap();
stdout.flush().await.unwrap();
}
});
let authority = url.authority().unwrap().clone();
// Make 4 requests
for _ in 0..4 {
let req = Request::builder()
.uri(url.clone())
.header(hyper::header::HOST, authority.as_str())
.body(Body::from("test".to_string()))?;
let mut res = sender.send_request(req).await?;
let mut stdout = io::stdout();
stdout
.write_all(format!("Response: {}\n", res.status()).as_bytes())
.await
.unwrap();
stdout
.write_all(format!("Headers: {:#?}\n", res.headers()).as_bytes())
.await
.unwrap();
stdout.flush().await.unwrap();
// Print the response body
while let Some(next) = res.frame().await {
let frame = next?;
if let Some(chunk) = frame.data_ref() {
stdout.write_all(chunk).await.unwrap();
}
}
stdout.write_all(b"\n-----------------\n").await.unwrap();
stdout.flush().await.unwrap();
}
Ok(())
}
// NOTE: This part is only needed for HTTP/2. HTTP/1 doesn't need an executor.
//
// Since the Server needs to spawn some background tasks, we needed
// to configure an Executor that can spawn !Send futures...
#[derive(Clone, Copy, Debug)]
struct LocalExec;
impl<F> hyper::rt::Executor<F> for LocalExec
where
F: std::future::Future + 'static, // not requiring `Send`
{
fn execute(&self, fut: F) {
// This will spawn into the currently running `LocalSet`.
tokio::task::spawn_local(fut);
}
}
struct IOTypeNotSend {
_marker: PhantomData<*const ()>,
stream: TokioIo<TcpStream>,
}
impl IOTypeNotSend {
fn new(stream: TokioIo<TcpStream>) -> Self {
Self {
_marker: PhantomData,
stream,
}
}
}
impl hyper::rt::Write for IOTypeNotSend {
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<Result<usize, std::io::Error>> {
Pin::new(&mut self.stream).poll_write(cx, buf)
}
fn poll_flush(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), std::io::Error>> {
Pin::new(&mut self.stream).poll_flush(cx)
}
fn poll_shutdown(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), std::io::Error>> {
Pin::new(&mut self.stream).poll_shutdown(cx)
}
}
impl hyper::rt::Read for IOTypeNotSend {
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: hyper::rt::ReadBufCursor<'_>,
) -> Poll<std::io::Result<()>> {
Pin::new(&mut self.stream).poll_read(cx, buf)
}
}