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use super::{Extension, FromRequest, RequestParts};
use async_trait::async_trait;
use hyper::server::conn::AddrStream;
use std::future::ready;
use std::{
convert::Infallible,
fmt,
marker::PhantomData,
net::SocketAddr,
task::{Context, Poll},
};
use tower_http::add_extension::AddExtension;
use tower_service::Service;
pub struct IntoMakeServiceWithConnectInfo<S, C> {
svc: S,
_connect_info: PhantomData<fn() -> C>,
}
#[test]
fn traits() {
use crate::tests::*;
assert_send::<IntoMakeServiceWithConnectInfo<(), NotSendSync>>();
assert_sync::<IntoMakeServiceWithConnectInfo<(), NotSendSync>>();
}
impl<S, C> IntoMakeServiceWithConnectInfo<S, C> {
pub(crate) fn new(svc: S) -> Self {
Self {
svc,
_connect_info: PhantomData,
}
}
}
impl<S, C> fmt::Debug for IntoMakeServiceWithConnectInfo<S, C>
where
S: fmt::Debug,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("IntoMakeServiceWithConnectInfo")
.field("svc", &self.svc)
.finish()
}
}
pub trait Connected<T> {
type ConnectInfo: Clone + Send + Sync + 'static;
fn connect_info(target: T) -> Self::ConnectInfo;
}
impl Connected<&AddrStream> for SocketAddr {
type ConnectInfo = SocketAddr;
fn connect_info(target: &AddrStream) -> Self::ConnectInfo {
target.remote_addr()
}
}
impl<S, C, T> Service<T> for IntoMakeServiceWithConnectInfo<S, C>
where
S: Clone,
C: Connected<T>,
{
type Response = AddExtension<S, ConnectInfo<C::ConnectInfo>>;
type Error = Infallible;
type Future = ResponseFuture<Self::Response>;
fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, target: T) -> Self::Future {
let connect_info = ConnectInfo(C::connect_info(target));
let svc = AddExtension::new(self.svc.clone(), connect_info);
ResponseFuture {
future: ready(Ok(svc)),
}
}
}
opaque_future! {
pub type ResponseFuture<T> =
std::future::Ready<Result<T, Infallible>>;
}
#[derive(Clone, Copy, Debug)]
pub struct ConnectInfo<T>(pub T);
#[async_trait]
impl<B, T> FromRequest<B> for ConnectInfo<T>
where
B: Send,
T: Clone + Send + Sync + 'static,
{
type Rejection = <Extension<Self> as FromRequest<B>>::Rejection;
async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
let Extension(connect_info) = Extension::<Self>::from_request(req).await?;
Ok(connect_info)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::Server;
use crate::{handler::get, Router};
use std::net::{SocketAddr, TcpListener};
#[tokio::test]
async fn socket_addr() {
async fn handler(ConnectInfo(addr): ConnectInfo<SocketAddr>) -> String {
format!("{}", addr)
}
let listener = TcpListener::bind("127.0.0.1:0").unwrap();
let addr = listener.local_addr().unwrap();
let (tx, rx) = tokio::sync::oneshot::channel();
tokio::spawn(async move {
let app = Router::new().route("/", get(handler));
let server = Server::from_tcp(listener)
.unwrap()
.serve(app.into_make_service_with_connect_info::<SocketAddr, _>());
tx.send(()).unwrap();
server.await.expect("server error");
});
rx.await.unwrap();
let client = reqwest::Client::new();
let res = client.get(format!("http://{}", addr)).send().await.unwrap();
let body = res.text().await.unwrap();
assert!(body.starts_with("127.0.0.1:"));
}
#[tokio::test]
async fn custom() {
#[derive(Clone, Debug)]
struct MyConnectInfo {
value: &'static str,
}
impl Connected<&AddrStream> for MyConnectInfo {
type ConnectInfo = Self;
fn connect_info(_target: &AddrStream) -> Self::ConnectInfo {
Self {
value: "it worked!",
}
}
}
async fn handler(ConnectInfo(addr): ConnectInfo<MyConnectInfo>) -> &'static str {
addr.value
}
let listener = TcpListener::bind("127.0.0.1:0").unwrap();
let addr = listener.local_addr().unwrap();
let (tx, rx) = tokio::sync::oneshot::channel();
tokio::spawn(async move {
let app = Router::new().route("/", get(handler));
let server = Server::from_tcp(listener)
.unwrap()
.serve(app.into_make_service_with_connect_info::<MyConnectInfo, _>());
tx.send(()).unwrap();
server.await.expect("server error");
});
rx.await.unwrap();
let client = reqwest::Client::new();
let res = client.get(format!("http://{}", addr)).send().await.unwrap();
let body = res.text().await.unwrap();
assert_eq!(body, "it worked!");
}
}