jpmschweitzerandClaude Opus 4.6
f67caf1986
Server boilerplate epic (276) complete. Establishes the Rust simulation server foundation per D-020 (subprocess/IPC architecture). Structure: - bevy_ecs 0.18 + bevy_app 0.18, MessagePack serialization (rmp-serde) - SimulationPlugin with deterministic resources: SimulationTime (D-031), SimRng (D-030), InputQueue (D-010) - Core IPC types: ObserverSnapshot, PlayerInput, SimBridge trait (D-020) - CauseChain production component for provenance tracking (D-030) - SimulationTier types with LRU eviction support (D-026) - NPC 10-axis model components (D-024) - 15 tests: inline unit tests + integration smoke/serialization tests - make ci-server passes (clippy, fmt, build, test) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
55 lines
1.3 KiB
Rust
55 lines
1.3 KiB
Rust
// Simulation RNG system
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// Injectable ChaCha RNG resource for deterministic replay (D-030)
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// Ensures same seed produces same outcomes
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use bevy_ecs::prelude::*;
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use rand::SeedableRng;
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use rand_chacha::ChaCha20Rng;
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/// Simulation RNG resource
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/// ChaCha20 RNG with stored seed for deterministic replay
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#[derive(Resource)]
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pub struct SimRng {
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pub rng: ChaCha20Rng,
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seed: u64,
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}
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impl SimRng {
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/// Create a new SimRng with the given seed
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pub fn new(seed: u64) -> Self {
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Self {
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rng: ChaCha20Rng::seed_from_u64(seed),
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seed,
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}
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}
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/// Get the seed used to initialize this RNG
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pub fn seed(&self) -> u64 {
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self.seed
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use rand::Rng;
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#[test]
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fn same_seed_same_sequence() {
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let mut rng1 = SimRng::new(42);
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let mut rng2 = SimRng::new(42);
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let vals1: Vec<u32> = (0..100).map(|_| rng1.rng.random()).collect();
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let vals2: Vec<u32> = (0..100).map(|_| rng2.rng.random()).collect();
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assert_eq!(vals1, vals2);
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}
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#[test]
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fn different_seed_different_sequence() {
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let mut rng1 = SimRng::new(42);
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let mut rng2 = SimRng::new(43);
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let val1: u32 = rng1.rng.random();
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let val2: u32 = rng2.rng.random();
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assert_ne!(val1, val2);
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}
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}
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