async_timeout/
lib.rs

1use tokio::time::{Instant, Duration, Sleep, sleep};
2use std::{io, pin::Pin, task::{Poll, Context}, future::Future, sync::{Arc, Mutex}};
3
4#[derive(Debug)]
5pub struct VisitorTimeout {
6    last_visit: Arc<Mutex<Instant>>,
7    timeout: Duration,
8    timer: Sleep,
9}
10
11#[derive(Debug, Clone)]
12pub struct Visitor {
13    last_visit: Arc<Mutex<Instant>>,
14}
15
16impl VisitorTimeout {
17    pub fn new(timeout: Duration) -> (VisitorTimeout, Visitor)
18    {
19        let last_visit = Arc::new(Mutex::new(Instant::now()));
20        (VisitorTimeout {
21            last_visit: last_visit.clone(),
22            timeout,
23            timer: sleep(timeout),
24        }, Visitor {
25            last_visit
26        })
27    }
28    pub fn poll_timeout(&mut self,  cx: &mut Context<'_>) -> Poll<io::Result<()>> {
29        loop {
30            if let Poll::Pending = Pin::new(&mut self.timer).poll(cx) {
31                return Poll::Pending;
32            }
33            let elapsed = self.last_visit.lock().unwrap().elapsed();
34            if elapsed > self.timeout {
35                return Poll::Ready(Err(io::ErrorKind::TimedOut.into()))
36            } else {
37                self.timer = sleep(self.timeout - elapsed);
38            }
39        }
40    }
41}
42
43impl Future for VisitorTimeout {
44    type Output = io::Result<()>;
45    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
46        self.poll_timeout(cx)
47    }
48}
49
50impl Visitor {
51    pub fn visit(&self) {
52        *self.last_visit.lock().unwrap() = Instant::now();
53    }
54}
55
56#[derive(Debug)]
57pub struct Timeout {
58    last_visit: Instant,
59    timeout: Duration,
60    timer: Sleep,
61}
62
63impl Timeout {
64    pub fn new(timeout: Duration) -> Timeout
65    {
66        Timeout {
67            last_visit: Instant::now(),
68            timeout,
69            timer: sleep(timeout),
70        }
71    }
72    pub fn visit(&mut self) {
73        self.last_visit = Instant::now();
74    }
75    pub fn poll_timeout(&mut self,  cx: &mut Context<'_>) -> Poll<io::Result<()>> {
76        loop {
77            if let Poll::Pending = Pin::new(&mut self.timer).poll(cx) {
78                return Poll::Pending;
79            }
80            let elapsed = self.last_visit.elapsed();
81            if elapsed > self.timeout {
82                return Poll::Ready(Err(io::ErrorKind::TimedOut.into()))
83            } else {
84                self.timer = sleep(self.timeout - elapsed);
85            }
86        }
87    }
88}
89
90impl Future for Timeout {
91    type Output = io::Result<()>;
92    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
93        self.poll_timeout(cx)
94    }
95}
96
97#[cfg(test)]
98mod tests {
99    #[test]
100    fn it_works() {
101        assert_eq!(2 + 2, 4);
102    }
103}
async_timeout/lib.rs

async_timeout/
lib.rs
