rs_poker 5.0.0

A library to help with any Rust code dealing with poker. This includes card values, suits, hands, hand ranks, 5 card hand strength calculation, 7 card hand strength calulcation, and monte carlo game simulation helpers.
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

use std::sync::atomic::{AtomicUsize, Ordering};

use async_trait::async_trait;
use tracing::{instrument, trace};

use crate::arena::{action::AgentAction, game_state::GameState};

use super::{Agent, AgentGenerator};

/// A simple agent that always calls.
#[derive(Debug, Clone)]
pub struct CallingAgent {
    name: String,
}

impl CallingAgent {
    pub fn new(name: impl Into<String>) -> Self {
        Self { name: name.into() }
    }
}

impl Default for CallingAgent {
    fn default() -> Self {
        static COUNTER: AtomicUsize = AtomicUsize::new(0);
        let idx = COUNTER.fetch_add(1, Ordering::Relaxed);
        CallingAgent::new(format!("CallingAgent-{idx}"))
    }
}

#[async_trait]
impl Agent for CallingAgent {
    #[instrument(level = "trace", skip(self, game_state), fields(agent_name = %self.name))]
    async fn act(self: &mut CallingAgent, _id: u128, game_state: &GameState) -> AgentAction {
        let bet = game_state.current_round_bet();
        trace!(bet, "CallingAgent calling");
        AgentAction::Bet(bet)
    }

    fn name(&self) -> &str {
        &self.name
    }
}

/// Default `AgentGenerator` for `CallingAgent`.
#[derive(Debug, Clone, Default)]
pub struct CallingAgentGenerator {
    name: Option<String>,
}

impl CallingAgentGenerator {
    pub fn new() -> Self {
        Self { name: None }
    }

    pub fn with_name(name: impl Into<String>) -> Self {
        Self {
            name: Some(name.into()),
        }
    }

    fn resolve_name(&self, player_idx: usize) -> String {
        self.name
            .clone()
            .unwrap_or_else(|| format!("CallingAgent-{player_idx}"))
    }
}

impl AgentGenerator for CallingAgentGenerator {
    fn generate(&self, player_idx: usize, _game_state: &GameState) -> Box<dyn Agent> {
        Box::new(CallingAgent::new(self.resolve_name(player_idx)))
    }
}

#[cfg(test)]
mod tests {
    use crate::arena::HoldemSimulationBuilder;

    use super::*;
    use crate::arena::GameStateBuilder;

    fn test_game_state(stacks: Vec<f32>, big_blind: f32, small_blind: f32) -> GameState {
        GameStateBuilder::new()
            .stacks(stacks)
            .blinds(big_blind, small_blind)
            .build()
            .unwrap()
    }

    #[tokio::test(flavor = "current_thread")]
    async fn test_calling_generator_creates_named_caller() {
        let generator = CallingAgentGenerator::default();
        let game_state = test_game_state(vec![100.0; 3], 10.0, 5.0);

        let mut agent = generator.generate(2, &game_state);
        assert_eq!(agent.name(), "CallingAgent-2");

        match agent.act(0, &game_state).await {
            AgentAction::Bet(amount) => {
                assert_eq!(amount, game_state.current_round_bet());
            }
            action => panic!("Expected call-sized bet, got {:?}", action),
        }
    }

    #[test]
    fn test_calling_generator_uses_custom_name() {
        let generator = CallingAgentGenerator::with_name("CallerX");
        let game_state = test_game_state(vec![50.0; 2], 10.0, 5.0);

        let agent = generator.generate(0, &game_state);
        assert_eq!(agent.name(), "CallerX");
    }

    #[tokio::test]
    async fn test_call_agents() {
        let stacks = vec![100.0; 4];
        let game_state = test_game_state(stacks, 10.0, 5.0);
        let mut sim = HoldemSimulationBuilder::default()
            .game_state(game_state)
            .agents(vec![
                Box::new(CallingAgent::new("CallingAgent-0")),
                Box::new(CallingAgent::new("CallingAgent-1")),
                Box::new(CallingAgent::new("CallingAgent-2")),
                Box::new(CallingAgent::new("CallingAgent-3")),
            ])
            .build()
            .unwrap();

        sim.run().await;

        assert_eq!(sim.game_state.num_active_players(), 4);

        assert_ne!(0.0, sim.game_state.player_winnings.iter().sum::<f32>());
        assert_eq!(40.0, sim.game_state.player_winnings.iter().sum::<f32>());
    }
}