通过unix socket进行通讯要比tcp通讯的延迟和吞吐能力都强, 遗憾的就是只能搞本地, 像笔者这种独立开发者家里很穷, 搞不了那么多服务器, 刚好这个unix socket优势如此大, 也就符合了的类似需求。
网上的simple unix socket版本还是不要用为好。
参考代码如下：
#[cfg(unix)]
#[tokio::main]
async fn main() {
unix::server().await;
}
#[cfg(not(unix))]
fn main() {
println!("This example requires unix")
}
#[cfg(unix)]
mod unix {
use axum::{
body::Body,
extract::connect_info::{self, ConnectInfo},
http::{Method, Request, StatusCode, Uri},
routing::get,
Router,
};
use futures::ready;
use hyper::{
client::connect::{Connected, Connection},
server::accept::Accept,
};
use std::{
io,
path::PathBuf,
pin::Pin,
sync::Arc,
task::{Context, Poll},
};
use tokio::{
io::{AsyncRead, AsyncWrite},
net::{unix::UCred, UnixListener, UnixStream},
};
use tower::BoxError;
use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
pub async fn server() {
tracing_subscriber::registry()
.with(
tracing_subscriber::EnvFilter::try_from_default_env()
.unwrap_or_else(|_| "debug".into()),
)
.with(tracing_subscriber::fmt::layer())
.init();
let path = PathBuf::from("/tmp/axum/helloworld");
let _ = tokio::fs::remove_file(&path).await;
tokio::fs::create_dir_all(path.parent().unwrap())
.await
.unwrap();
let uds = UnixListener::bind(path.clone()).unwrap();
tokio::spawn(async {
let app = Router::new().route("/", get(handler));
hyper::Server::builder(ServerAccept { uds })
.serve(app.into_make_service_with_connect_info::<UdsConnectInfo>())
.await
.unwrap();
});
let connector = tower::service_fn(move |_: Uri| {
let path = path.clone();
Box::pin(async move {
let stream = UnixStream::connect(path).await?;
Ok::<_, io::Error>(ClientConnection { stream })
})
});
let client = hyper::Client::builder().build(connector);
let request = Request::builder()
.method(Method::GET)
.uri("http://uri-doesnt-matter.com")
.body(Body::empty())
.unwrap();
let response = client.request(request).await.unwrap();
assert_eq!(response.status(), StatusCode::OK);
let body = hyper::body::to_bytes(response.into_body()).await.unwrap();
let body = String::from_utf8(body.to_vec()).unwrap();
assert_eq!(body, "Hello, World!");
}
async fn handler(ConnectInfo(info): ConnectInfo<UdsConnectInfo>) -> &'static str {
println!("new connection from `{info:?}`");
"Hello, World!"
}
struct ServerAccept {
uds: UnixListener,
}
impl Accept for ServerAccept {
type Conn = UnixStream;
type Error = BoxError;
fn poll_accept(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Option<Result<Self::Conn, Self::Error>>> {
let (stream, _addr) = ready!(self.uds.poll_accept(cx))?;
Poll::Ready(Some(Ok(stream)))
}
}
struct ClientConnection {
stream: UnixStream,
}
impl AsyncWrite for ClientConnection {
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<Result<usize, io::Error>> {
Pin::new(&mut self.stream).poll_write(cx, buf)
}
fn poll_flush(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), io::Error>> {
Pin::new(&mut self.stream).poll_flush(cx)
}
fn poll_shutdown(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), io::Error>> {
Pin::new(&mut self.stream).poll_shutdown(cx)
}
}
impl AsyncRead for ClientConnection {
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut tokio::io::ReadBuf<'_>,
) -> Poll<io::Result<()>> {
Pin::new(&mut self.stream).poll_read(cx, buf)
}
}
impl Connection for ClientConnection {
fn connected(&self) -> Connected {
Connected::new()
}
}
#[derive(Clone, Debug)]
#[allow(dead_code)]
struct UdsConnectInfo {
peer_addr: Arc<tokio::net::unix::SocketAddr>,
peer_cred: UCred,
}
impl connect_info::Connected<&UnixStream> for UdsConnectInfo {
fn connect_info(target: &UnixStream) -> Self {
let peer_addr = target.peer_addr().unwrap();
let peer_cred = target.peer_cred().unwrap();
Self {
peer_addr: Arc::new(peer_addr),
peer_cred,
}
}
}
}
