fluxio 0.5.3

fluxio
Documentation 
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#![deny(warnings)]

use std::convert::Infallible;
use std::net::SocketAddr;

use fluxio::service::{make_service_fn, service_fn};
use fluxio::upgrade::Upgraded;
use fluxio::{Body, Client, Method, Request, Response, Server};

use tokio::net::TcpStream;

type HttpClient = Client<fluxio::client::HttpConnector>;

// To try this example:
// 1. cargo run --example http_proxy
// 2. config http_proxy in command line
//    $ export http_proxy=http://127.0.0.1:8100
//    $ export https_proxy=http://127.0.0.1:8100
// 3. send requests
//    $ curl -i https://www.some_domain.com/
#[tokio::main]
async fn main() {
    let addr = SocketAddr::from(([127, 0, 0, 1], 8100));

    let client = Client::builder()
        .http1_title_case_headers(true)
        .http1_preserve_header_case(true)
        .build_http();

    let make_service = make_service_fn(move |_| {
        let client = client.clone();
        async move { Ok::<_, Infallible>(service_fn(move |req| proxy(client.clone(), req))) }
    });

    let server = Server::bind(&addr)
        .http1_preserve_header_case(true)
        .http1_title_case_headers(true)
        .serve(make_service);

    println!("Listening on http://{}", addr);

    if let Err(e) = server.await {
        eprintln!("server error: {}", e);
    }
}

async fn proxy(client: HttpClient, req: Request<Body>) -> Result<Response<Body>, fluxio::Error> {
    println!("req: {:?}", req);

    if Method::CONNECT == req.method() {
        // Received an HTTP request like:
        // ```
        // CONNECT www.domain.com:443 HTTP/1.1
        // Host: www.domain.com:443
        // Proxy-Connection: Keep-Alive
        // ```
        //
        // When HTTP method is CONNECT we should return an empty body
        // then we can eventually upgrade the connection and talk a new protocol.
        //
        // Note: only after client received an empty body with STATUS_OK can the
        // connection be upgraded, so we can't return a response inside
        // `on_upgrade` future.
        if let Some(addr) = host_addr(req.uri()) {
            tokio::task::spawn(async move {
                match fluxio::upgrade::on(req).await {
                    Ok(upgraded) => {
                        if let Err(e) = tunnel(upgraded, addr).await {
                            eprintln!("server io error: {}", e);
                        };
                    }
                    Err(e) => eprintln!("upgrade error: {}", e),
                }
            });

            Ok(Response::new(Body::empty()))
        } else {
            eprintln!("CONNECT host is not socket addr: {:?}", req.uri());
            let mut resp = Response::new(Body::from("CONNECT must be to a socket address"));
            *resp.status_mut() = http::StatusCode::BAD_REQUEST;

            Ok(resp)
        }
    } else {
        client.request(req).await
    }
}

fn host_addr(uri: &http::Uri) -> Option<String> {
    uri.authority().and_then(|auth| Some(auth.to_string()))
}

// Create a TCP connection to host:port, build a tunnel between the connection and
// the upgraded connection
async fn tunnel(mut upgraded: Upgraded, addr: String) -> std::io::Result<()> {
    // Connect to remote server
    let mut server = TcpStream::connect(addr).await?;

    // Proxying data
    let (from_client, from_server) =
        tokio::io::copy_bidirectional(&mut upgraded, &mut server).await?;

    // Print message when done
    println!(
        "client wrote {} bytes and received {} bytes",
        from_client, from_server
    );

    Ok(())
}