hyper-serve 0.6.2

High level server designed to be used with axum framework.
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

use crate::notify_once::NotifyOnce;
use std::{
    net::SocketAddr,
    sync::{
        atomic::{AtomicUsize, Ordering},
        Arc, Mutex,
    },
    time::Duration,
};
use tokio::{sync::Notify, time::sleep};

/// A handle for [`Server`](crate::server::Server).
#[derive(Clone, Debug, Default)]
pub struct Handle {
    inner: Arc<HandleInner>,
}

#[derive(Debug, Default)]
struct HandleInner {
    addr: Mutex<Option<SocketAddr>>,
    addr_notify: Notify,
    conn_count: AtomicUsize,
    shutdown: NotifyOnce,
    graceful: NotifyOnce,
    graceful_dur: Mutex<Option<Duration>>,
    conn_end: NotifyOnce,
}

impl Handle {
    /// Create a new handle.
    pub fn new() -> Self {
        Self::default()
    }

    /// Get the number of connections.
    pub fn connection_count(&self) -> usize {
        self.inner.conn_count.load(Ordering::SeqCst)
    }

    /// Shutdown the server.
    pub fn shutdown(&self) {
        self.inner.shutdown.notify_waiters();
    }

    /// Gracefully shutdown the server.
    ///
    /// `None` means indefinite grace period.
    pub fn graceful_shutdown(&self, duration: Option<Duration>) {
        *self.inner.graceful_dur.lock().unwrap() = duration;

        self.inner.graceful.notify_waiters();
    }

    /// Returns local address and port when server starts listening.
    ///
    /// Returns `None` if server fails to bind.
    pub async fn listening(&self) -> Option<SocketAddr> {
        let notified = self.inner.addr_notify.notified();

        if let Some(addr) = *self.inner.addr.lock().unwrap() {
            return Some(addr);
        }

        notified.await;

        *self.inner.addr.lock().unwrap()
    }

    pub(crate) fn notify_listening(&self, addr: Option<SocketAddr>) {
        *self.inner.addr.lock().unwrap() = addr;

        self.inner.addr_notify.notify_waiters();
    }

    pub(crate) fn watcher(&self) -> Watcher {
        Watcher::new(self.clone())
    }

    pub(crate) async fn wait_shutdown(&self) {
        self.inner.shutdown.notified().await;
    }

    pub(crate) async fn wait_graceful_shutdown(&self) {
        self.inner.graceful.notified().await;
    }

    pub(crate) async fn wait_connections_end(&self) {
        if self.inner.conn_count.load(Ordering::SeqCst) == 0 {
            return;
        }

        let deadline = *self.inner.graceful_dur.lock().unwrap();

        match deadline {
            Some(duration) => tokio::select! {
                biased;
                _ = sleep(duration) => self.shutdown(),
                _ = self.inner.conn_end.notified() => (),
            },
            None => self.inner.conn_end.notified().await,
        }
    }
}

pub(crate) struct Watcher {
    handle: Handle,
}

impl Watcher {
    fn new(handle: Handle) -> Self {
        handle.inner.conn_count.fetch_add(1, Ordering::SeqCst);

        Self { handle }
    }

    pub(crate) async fn wait_graceful_shutdown(&self) {
        self.handle.wait_graceful_shutdown().await
    }

    pub(crate) async fn wait_shutdown(&self) {
        self.handle.wait_shutdown().await
    }
}

impl Drop for Watcher {
    fn drop(&mut self) {
        let count = self.handle.inner.conn_count.fetch_sub(1, Ordering::SeqCst) - 1;

        if count == 0 && self.handle.inner.graceful.is_notified() {
            self.handle.inner.conn_end.notify_waiters();
        }
    }
}