channel-async 0.3.0-deprecated

Async/Stream Extensions for crossbeam-channel 
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

//! #channel-async
//!
//! Async/stream extensions for crossbeam-channel
//!
//! ```no-run
//! use futures::{FutureExt, TryFutureExt};
//!
//!#[tokio::main]
//!async fn run_channels() {
//!    let (tx, rx) = channel_async::unbounded(Duration::from_millis(100));
//!
//!    let send_fut = async move {
//!        for i in 1..100 {
//!            tx.send(i).await.expect("Failed to send");
//!        }
//!    };
//!
//!    tokio::spawn(send_fut);
//!
//!    let recv_fut = async move {
//!      let rcvd: Vec<_> = rx.collect().await;
//!      rcvd
//!    };
//!
//!    let rcvd = recv_fut.await;
//!
//!    println!("Received {} messages", rcvd.len());
//!}
mod errors;
mod receiver;
mod sender;

pub use errors::Error;
pub use receiver::Receiver;
pub use sender::Sender;

use std::time::Duration;

pub fn unbounded<T>(delay: Duration) -> (Sender<T>, Receiver<T>) {
    let (tx, rx) = crossbeam_channel::unbounded();
    (Sender::new(tx, delay), Receiver::new(rx, delay))
}

pub fn bounded<T>(delay: Duration, cap: usize) -> (Sender<T>, Receiver<T>) {
    let (tx, rx) = crossbeam_channel::bounded(cap);
    (Sender::new(tx, delay), Receiver::new(rx, delay))
}

#[cfg(test)]
mod tests {
    use super::*;
    use futures::StreamExt;

    #[tokio::test]
    async fn send_receive() {
        let (tx, rx) = unbounded(Duration::from_millis(100));

        let send_fut = async move {
            for i in 0..100usize {
                tx.send(i).await.expect("Failed to send");
            }
        };

        let recv_fut = async move {
            let f: Vec<_> = rx.collect().await;
            f
        };

        tokio::spawn(send_fut);

        let recv = recv_fut.await;

        assert_eq!(recv.len(), 100);
    }

    #[tokio::test]
    async fn send_receive_slow_sender_single_thread() {
        let (tx, rx) = unbounded(Duration::from_millis(10));

        let send_fut = async move {
            for i in 0..100usize {
                if i % 10 == 0 {
                    tokio::timer::delay_for(Duration::from_millis(100)).await;
                }
                tx.send(i).await.expect("Failed to send");
            }
        };

        let recv_fut = async move {
            let f: Vec<_> = rx.collect().await;
            f
        };

        tokio::spawn(send_fut);

        let recv = recv_fut.await;

        assert_eq!(recv.len(), 100);
    }

    #[tokio::test]
    async fn send_receive_slow_sender_multi_thread() {
        let (tx, rx) = unbounded(Duration::from_secs(10));

        let send_fut = async move {
            for i in 0..100usize {
                if i % 10 == 0 {
                    tokio::timer::delay_for(Duration::from_millis(100)).await;
                }
                tx.send(i).await.expect("Failed to send");
            }
        };

        let recv_fut = async move {
            let f: Vec<_> = rx.collect().await;
            f
        };

        tokio::spawn(send_fut);

        let recv = recv_fut.await;

        assert_eq!(recv.len(), 100);
    }
}