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
167
168
169
170
171
172
173

//! Logic to start new HTTP server instances.
use std::future::Future;
use std::net::SocketAddr;
use std::str::FromStr;
use std::sync::Arc;

use async_trait::async_trait;
use axum_server::tls_rustls::RustlsConfig;
use axum_server::Handle;
use futures::future::BoxFuture;
use log::info;

use super::routes::router;
use crate::servers::http::server::HttpServerLauncher;
use crate::tracker::Tracker;

#[derive(Debug)]
pub enum Error {
    Error(String),
}

pub struct Launcher;

impl Launcher {
    /// It starts a new HTTP server instance from a TCP listener with graceful shutdown.
    ///
    /// # Panics
    ///
    /// Will panic if:
    ///
    /// - The TCP listener could not be bound.
    /// - The Axum server crashes.
    pub fn start_from_tcp_listener_with_graceful_shutdown<F>(
        tcp_listener: std::net::TcpListener,
        tracker: Arc<Tracker>,
        shutdown_signal: F,
    ) -> BoxFuture<'static, ()>
    where
        F: Future<Output = ()> + Send + 'static,
    {
        let app = router(tracker);

        Box::pin(async {
            axum::Server::from_tcp(tcp_listener)
                .expect("Could not bind to tcp listener.")
                .serve(app.into_make_service_with_connect_info::<std::net::SocketAddr>())
                .with_graceful_shutdown(shutdown_signal)
                .await
                .expect("Axum server crashed.");
        })
    }

    /// It starts a new HTTPS server instance from a TCP listener with graceful shutdown.
    ///
    /// # Panics
    ///
    /// Will panic if:
    ///
    /// - The SSL certificate could not be read from the provided path or is invalid.
    /// - The Axum server crashes.
    pub fn start_tls_from_tcp_listener_with_graceful_shutdown<F>(
        tcp_listener: std::net::TcpListener,
        (ssl_cert_path, ssl_key_path): (String, String),
        tracker: Arc<Tracker>,
        shutdown_signal: F,
    ) -> BoxFuture<'static, ()>
    where
        F: Future<Output = ()> + Send + 'static,
    {
        let app = router(tracker);

        let handle = Handle::new();

        let cloned_handle = handle.clone();

        tokio::task::spawn_local(async move {
            shutdown_signal.await;
            cloned_handle.shutdown();
        });

        Box::pin(async {
            let tls_config = RustlsConfig::from_pem_file(ssl_cert_path, ssl_key_path)
                .await
                .expect("Could not read tls cert.");

            axum_server::from_tcp_rustls(tcp_listener, tls_config)
                .handle(handle)
                .serve(app.into_make_service_with_connect_info::<std::net::SocketAddr>())
                .await
                .expect("Axum server crashed.");
        })
    }
}

#[async_trait]
impl HttpServerLauncher for Launcher {
    fn new() -> Self {
        Self {}
    }

    fn start_with_graceful_shutdown<F>(
        &self,
        cfg: torrust_tracker_configuration::HttpTracker,
        tracker: Arc<Tracker>,
        shutdown_signal: F,
    ) -> (SocketAddr, BoxFuture<'static, ()>)
    where
        F: Future<Output = ()> + Send + 'static,
    {
        let addr = SocketAddr::from_str(&cfg.bind_address).expect("bind_address is not a valid SocketAddr.");
        let tcp_listener = std::net::TcpListener::bind(addr).expect("Could not bind tcp_listener to address.");
        let bind_addr = tcp_listener
            .local_addr()
            .expect("Could not get local_addr from tcp_listener.");

        if let (true, Some(ssl_cert_path), Some(ssl_key_path)) = (cfg.ssl_enabled, &cfg.ssl_cert_path, &cfg.ssl_key_path) {
            let server = Self::start_tls_from_tcp_listener_with_graceful_shutdown(
                tcp_listener,
                (ssl_cert_path.to_string(), ssl_key_path.to_string()),
                tracker,
                shutdown_signal,
            );

            (bind_addr, server)
        } else {
            let server = Self::start_from_tcp_listener_with_graceful_shutdown(tcp_listener, tracker, shutdown_signal);

            (bind_addr, server)
        }
    }
}

/// Starts a new HTTP server instance.
///
/// # Panics
///
/// Panics if the server could not listen to shutdown (ctrl+c) signal.
pub fn start(socket_addr: std::net::SocketAddr, tracker: Arc<Tracker>) -> impl Future<Output = hyper::Result<()>> {
    let app = router(tracker);

    let server = axum::Server::bind(&socket_addr).serve(app.into_make_service_with_connect_info::<std::net::SocketAddr>());

    server.with_graceful_shutdown(async move {
        tokio::signal::ctrl_c().await.expect("Failed to listen to shutdown signal.");
        info!("Stopping Torrust HTTP tracker server on http://{} ...", socket_addr);
    })
}

/// Starts a new HTTPS server instance.
///
/// # Panics
///
/// Panics if the server could not listen to shutdown (ctrl+c) signal.
pub fn start_tls(
    socket_addr: std::net::SocketAddr,
    ssl_config: RustlsConfig,
    tracker: Arc<Tracker>,
) -> impl Future<Output = Result<(), std::io::Error>> {
    let app = router(tracker);

    let handle = Handle::new();
    let shutdown_handle = handle.clone();

    tokio::spawn(async move {
        tokio::signal::ctrl_c().await.expect("Failed to listen to shutdown signal.");
        info!("Stopping Torrust HTTP tracker server on https://{} ...", socket_addr);
        shutdown_handle.shutdown();
    });

    axum_server::bind_rustls(socket_addr, ssl_config)
        .handle(handle)
        .serve(app.into_make_service_with_connect_info::<std::net::SocketAddr>())
}