dsim 0.3.1

A deterministic simulation testing framework for Rust
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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157

fn main() {
    println!("Hello, world!");
}

#[cfg(test)]
mod tests {
    use dsim::message_bus::{Message, MessageBus, Simulator, Subscriber};
    use std::{
        collections::VecDeque,
        time::{self, UNIX_EPOCH},
    };

    /// PingPong will emit a ping every tick, and respond with a pong.
    struct PingPong {
        pings: VecDeque<std::time::SystemTime>,
        ping_hold_time: std::time::Duration,
        destination: String,
        name: String,
        priority: usize,
    }

    impl PingPong {
        pub fn new(ping_hold_time: std::time::Duration, destination: &str, name: &str, priority: usize) -> Self {
            Self {
                pings: VecDeque::new(),
                ping_hold_time,
                destination: destination.to_string(),
                name: name.to_string(),
                priority,
            }
        }
    }

    impl Subscriber for PingPong {
        fn receive(
            &mut self,
            msg: Box<dyn Message>,
            at: std::time::SystemTime,
        ) -> Vec<dsim::message_bus::Envelope> {
            if let Some(_) = msg.downcast_ref::<Ping>() {
                self.pings.push_back(at);
                println!("{} received Ping at {:?}", self.name, at);
            } else if let Some(_) = msg.downcast_ref::<Pong>() {
                println!("{} received Pong at {:?}", self.name, at);
            } else {
                panic!("Message is not a Ping or Pong");
            }
            vec![]
        }

        fn tick(&mut self, at: std::time::SystemTime) -> Vec<dsim::message_bus::Envelope> {
            let mut out: Vec<dsim::message_bus::Envelope> = vec![dsim::message_bus::Envelope {
                message: Box::new(Ping {}),
                destination: self.destination.clone(),
                priority: self.priority,
            }];
            while let Some(&oldest) = self.pings.front() {
                if at.duration_since(oldest).unwrap() >= self.ping_hold_time {
                    self.pings.pop_front();
                    println!("{} sending pong to {}", self.name, self.destination);
                    out.push(dsim::message_bus::Envelope {
                        message: Box::new(Pong {}),
                        destination: self.destination.clone(),
                        priority: self.priority,
                    });
                } else {
                    break;
                }
            }
            out
        }
    }

    struct Ping {}

    impl Message for Ping {}

    struct Pong {}

    impl Message for Pong {}

    #[test]
    fn test_message_bus() {
        let mut message_bus = MessageBus::new(std::time::Duration::from_millis(500), 2);
        let ping_pong_1 = PingPong::new(
            std::time::Duration::from_millis(1000),
            "ping_pong_2",
            "ping_pong_1",
            0,
        );
        let ping_pong_2 = PingPong::new(
            std::time::Duration::from_millis(1000),
            "ping_pong_1",
            "ping_pong_2",
            1, // normally, ping_pong_2 would log the recv first, but this forces
        );
        message_bus.subscribe("ping_pong_1".to_string(), Box::new(ping_pong_1));
        message_bus.subscribe("ping_pong_2".to_string(), Box::new(ping_pong_2));
        message_bus.start();
        std::thread::sleep(time::Duration::from_secs(3));
        message_bus.stop();
    }

    #[test]
    fn test_simulator_step_by() {
        let ping_pong_1 = PingPong::new(
            std::time::Duration::from_millis(1000),
            "ping_pong_2",
            "ping_pong_1",
            0,
        );
        let ping_pong_2 = PingPong::new(
            std::time::Duration::from_millis(1000),
            "ping_pong_1",
            "ping_pong_2",
            1,
        );
        let mut simulator = Simulator::new(
            maplit::hashmap! {
                "ping_pong_1".to_string() => Box::new(ping_pong_1) as Box<dyn Subscriber>,
                "ping_pong_2".to_string() => Box::new(ping_pong_2) as Box<dyn Subscriber>,
            },
            UNIX_EPOCH,
            vec![vec![], vec![]], // Create 2 priority queues
        );

        for _ in 0..50 {
            simulator.step(std::time::Duration::from_millis(100));
        }
    }

    #[test]
    fn test_simulator_step_to() {
        let ping_pong_1 = PingPong::new(
            std::time::Duration::from_millis(1000),
            "ping_pong_2",
            "ping_pong_1",
            1,
        );
        let ping_pong_2 = PingPong::new(
            std::time::Duration::from_millis(1000),
            "ping_pong_1",
            "ping_pong_2",
            0,
        );
        let mut simulator = Simulator::new(
            maplit::hashmap! {
                "ping_pong_1".to_string() => Box::new(ping_pong_1) as Box<dyn Subscriber>,
                "ping_pong_2".to_string() => Box::new(ping_pong_2) as Box<dyn Subscriber>,
            },
            UNIX_EPOCH,
            vec![vec![], vec![]], // Create 2 priority queues
        );

        simulator.step_to(UNIX_EPOCH + std::time::Duration::from_secs(5), std::time::Duration::from_millis(100));
    }
}