n3server 0.1.1

A quic/http3 reverse proxy
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166

//! `N3` is a fast `quic/http3` reverse proxy implementation.

#![cfg_attr(docsrs, feature(doc_cfg))]

use std::{
    io::Result,
    net::{SocketAddr, ToSocketAddrs},
};

use futures::{
    AsyncWriteExt,
    io::{BufReader, copy_buf},
};
use n3_spawner::spawn;
use n3io::net::TcpStream;
use n3quic::{QuicConn, QuicConnExt, QuicServer};

/// Reverse proxy server.
pub struct N3 {
    /// Redirection target for tcp stream.
    redirect_to: SocketAddr,
    /// the QUIC server configuration.
    quic_server: QuicServer,
}

impl N3 {
    /// Create a new `N3` configuration with `redirect_to` target.
    pub fn new(redirect_to: SocketAddr) -> Self {
        Self {
            redirect_to,
            quic_server: QuicServer::new(),
        }
    }

    // Update `quic_server` config.
    pub fn quic_server<F>(mut self, f: F) -> Self
    where
        F: FnOnce(QuicServer) -> QuicServer,
    {
        self.quic_server = f(self.quic_server);
        self
    }

    /// Bind `n3` to `laddrs` and run it.
    pub async fn bind<S>(self, laddrs: S) -> Result<()>
    where
        S: ToSocketAddrs,
    {
        let mut listener = self.quic_server.bind(laddrs).await?;

        loop {
            let conn = listener.accept().await?;

            spawn(async move {
                let trace_id = conn.quiche_conn(|conn| conn.trace_id().to_owned());

                log::info!("redirect, id={}, to={}", trace_id, self.redirect_to);

                if let Err(err) = Self::redirect_loop(conn, self.redirect_to, &trace_id).await {
                    log::error!("pipe is broken, id={}, err={}", trace_id, err);
                } else {
                    log::info!("pipe is broken, id={}", trace_id);
                }
            })?;
        }
    }

    async fn redirect_loop(conn: QuicConn, raddr: SocketAddr, trace_id: &str) -> Result<()> {
        loop {
            let inbound = conn.accept().await?;

            let outbound = TcpStream::connect(raddr).await?;

            let stream_id = inbound.id();

            let laddr = outbound.mio_socket().local_addr()?;

            log::info!(
                "new pipe quic({},{}) => tcp({},{})",
                trace_id,
                stream_id,
                laddr,
                raddr
            );

            let (mut inbound_writer, inbound_reader) = inbound.split();
            let (mut outbound_writer, outbound_reader) = outbound.split();

            let trace_id_owned = trace_id.to_owned();

            spawn(async move {
                match copy_buf(BufReader::new(outbound_reader), &mut inbound_writer).await {
                    Ok(len) => {
                        log::info!(
                            "stream(backward) is closed, quic({},{}) <== tcp({},{}), trans_size={}",
                            trace_id_owned,
                            stream_id,
                            laddr,
                            raddr,
                            len
                        );
                    }
                    Err(err) => {
                        log::error!(
                            "stream(backward) is broken, quic({},{}) <== tcp({},{}), err={}",
                            trace_id_owned,
                            stream_id,
                            laddr,
                            raddr,
                            err
                        );
                    }
                }

                if let Err(err) = inbound_writer.close().await {
                    log::trace!(
                        "stream(backward) close writer, quic({},{}) ==> tcp({},{}), err={}",
                        trace_id_owned,
                        stream_id,
                        laddr,
                        raddr,
                        err
                    );
                }
            })?;

            let trace_id_owned = trace_id.to_owned();

            spawn(async move {
                match copy_buf(BufReader::new(inbound_reader), &mut outbound_writer).await {
                    Ok(len) => {
                        log::info!(
                            "stream(forward) is closed, quic({},{}) ==> tcp({},{}), trans_size={}",
                            trace_id_owned,
                            stream_id,
                            laddr,
                            raddr,
                            len
                        );
                    }
                    Err(err) => {
                        log::error!(
                            "stream(forward) is broken, quic({},{}) ==> tcp({},{}), err={}",
                            trace_id_owned,
                            stream_id,
                            laddr,
                            raddr,
                            err
                        );
                    }
                }

                if let Err(err) = outbound_writer.close().await {
                    log::error!(
                        "stream(forward) close writer, quic({},{}) <== tcp({},{}), err={}",
                        trace_id_owned,
                        stream_id,
                        laddr,
                        raddr,
                        err
                    );
                }
            })?;
        }
    }
}