deadpool 0.8.0

Dead simple async pool
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

#[cfg(feature = "managed")]
mod tests {

    use std::time::Duration;

    use async_trait::async_trait;
    use tokio::time::timeout;

    use deadpool::managed::{RecycleError, RecycleResult};
    type Pool = deadpool::managed::Pool<Manager>;

    struct Manager {
        create_fail: bool,
        recycle_fail: bool,
    }

    #[async_trait]
    impl deadpool::managed::Manager for Manager {
        type Type = ();
        type Error = ();
        async fn create(&self) -> Result<(), ()> {
            if self.create_fail {
                Err(())
            } else {
                Ok(())
            }
        }
        async fn recycle(&self, _conn: &mut ()) -> RecycleResult<()> {
            if self.recycle_fail {
                Err(RecycleError::Backend(()))
            } else {
                Ok(())
            }
        }
    }

    #[tokio::main]
    #[test]
    async fn test_unreliable_create() {
        let manager = Manager {
            create_fail: true,
            recycle_fail: false,
        };
        let pool = Pool::new(manager, 16);
        {
            assert_eq!(pool.get().await.is_ok(), false);
        }
        let status = pool.status();
        assert_eq!(status.available, 0);
        assert_eq!(status.size, 0);
        {
            assert_eq!(
                timeout(Duration::from_millis(10), pool.get())
                    .await
                    .unwrap()
                    .is_ok(),
                false
            );
        }
        assert_eq!(status.available, 0);
        assert_eq!(status.size, 0);
    }

    #[tokio::main]
    #[test]
    async fn test_unreliable_recycle() {
        let manager = Manager {
            create_fail: false,
            recycle_fail: true,
        };
        let pool = Pool::new(manager, 16);
        {
            let _a = pool.get().await.unwrap();
            let _b = pool.get().await.unwrap();
        }
        let status = pool.status();
        assert_eq!(status.available, 2);
        assert_eq!(status.size, 2);
        {
            let _a = pool.get().await.unwrap();
            // All connections fail to recycle. Thus reducing the
            // available counter to 0.
            let status = pool.status();
            assert_eq!(status.available, 0);
            assert_eq!(status.size, 1);
        }
        let status = pool.status();
        assert_eq!(status.available, 1);
        assert_eq!(status.size, 1);
    }
}