Struct EngineState 

pub struct EngineState {

    pub algorithm_name: String,
    pub algorithm_state: Vec<u8>,
    pub gene_pool: GenePool,
    pub rng_seed: u64,
    pub budget: Budget,
    pub gene_stats: Vec<(String, String, u32, u32)>,
    pub fitness_history: VecDeque<f64>,
    pub stagnation_counter: u32,
    pub request_count: usize,
    pub stats: SearchStats,
    pub schema_version: u32,
    pub corpus: BypassCorpus,
    pub next_id: u64,
    pub generation_evals: usize,
}

Serializable engine state.

Schema version 2 (2026-05-10) adds corpus, next_id, and generation_evals so a restored engine doesn’t lose all of its bypass discoveries and doesn’t reset its eval-id counter (which would collide with any in-flight evaluation that survived the crash).

What is intentionally NOT serialized:

• in_flight: by definition transient; any pending eval at checkpoint time is lost on crash, but the corpus capture above means the useful bypasses are preserved.
• cache: LRU cache of payload→verdict; recomputable.
• target_health: runtime stats; resets on resume.
• checkpoint_path: re-injected by the caller after load.
• pending_single: legacy sequential API state, transient.
• RNG state: search algorithms each capture their own RNG state inside algorithm_state; the engine-level rng is used only for next_eval_id minting and gene-pool sampling when the algorithm doesn’t override.

Fields

algorithm_name: String

algorithm_state: Vec<u8>

gene_pool: GenePool

rng_seed: u64

budget: Budget

gene_stats: Vec<(String, String, u32, u32)>

fitness_history: VecDeque<f64>

stagnation_counter: u32

request_count: usize

stats: SearchStats

schema_version: u32

corpus: BypassCorpus

Saved bypass discoveries — added in schema_version 2. Defaults to empty for v1 checkpoints loaded by a v2 engine.

next_id: u64

Next eval_id to mint — added in schema_version 2 so a restored engine doesn’t recycle IDs that may collide with any in-flight evaluation that survived the crash.

generation_evals: usize

Evaluations issued in the current generation — added in v2.

Trait Implementations

impl Clone for EngineState

fn clone(&self) -> EngineState

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for EngineState

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for EngineState

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for EngineState

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.