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CanonicalSequenceState

evm_fork_cache::reactive

Struct CanonicalSequenceState 

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pub struct CanonicalSequenceState { /* private fields */ }
Expand description

Provider-neutral snapshot consumed by validate_canonical_sequence.

Composite subscribers can persist this small chain-state view beside their own delivery checkpoint and validate a complete delivery envelope before it reaches a ReactiveRuntime. The retained history may be sparse (blocks without matching events need not be present), but it must contain at most one compatible identity per height. Its oldest entry is also the durable rollback horizon: an unretained explicit ancestor is accepted only when that oldest entry is at or below the ancestor. This type carries no cache data, event payloads, handler state, or transport-specific cursor.

The serde representation is a convenience for caller-owned persistence; it is not a versioned wire or checkpoint format. Durable protocols should wrap it in their own versioned envelope and define migrations before upgrading this pre-1.0 crate. External callers also own retention: successful validation appends canonical identities but does not silently discard the rollback proof window. Bound it with Self::retain_recent_history after committing the matching source cursor/ACK.

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impl CanonicalSequenceState

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pub fn new( retained_canonical_history: Vec<BlockRef>, coverage_head: Option<BlockRef>, safe_head: Option<BlockRef>, finalized_head: Option<BlockRef>, ) -> Self

Construct a validation snapshot from retained canonical metadata.

Construction does not validate ordering, adjacency, coverage, or finality invariants. Call Self::validate before installing decoded or externally assembled state.

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pub fn retained_canonical_history(&self) -> &[BlockRef]

Sparse retained canonical history in ascending processing order.

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pub const fn coverage_head(&self) -> Option<&BlockRef>

Highest canonical identity covered by this state, when known.

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pub const fn safe_head(&self) -> Option<&BlockRef>

Latest safe head accepted by the validator, when known.

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pub const fn finalized_head(&self) -> Option<&BlockRef>

Latest finalized head accepted by the validator, when known.

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pub fn retain_recent_history(&mut self, max_entries: usize)

Retain at most the newest max_entries canonical history identities.

Coverage and safe/finalized heads are unchanged. The oldest retained identity defines how far strict validation can prove a complete rollback, so choose a bound at least as large as the deployment’s supported reorg depth and trim only after atomically committing the corresponding validated state and source cursor. 0 intentionally produces a coverage-only snapshot.

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pub fn validate(&self) -> Result<(), ReactiveError>

Validate a decoded/checkpointed snapshot before installing it.

This rejects out-of-order or conflicting retained identities, broken adjacent parent links, retained history without coverage, incompatible coverage/finality aliases, hash reuse across heights, known parent hashes at non-adjacent heights, finality beyond coverage, and a finalized head beyond or conflicting with the safe head.

§Errors

Returns ReactiveError when any retained identity, parent link, coverage alias, or safe/finalized relationship violates the canonical snapshot invariants described above.

Trait Implementations§

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impl Clone for CanonicalSequenceState

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fn clone(&self) -> CanonicalSequenceState

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for CanonicalSequenceState

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

Formats the value using the given formatter. Read more
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impl Default for CanonicalSequenceState

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fn default() -> CanonicalSequenceState

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for CanonicalSequenceState

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Eq for CanonicalSequenceState

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impl PartialEq for CanonicalSequenceState

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fn eq(&self, other: &CanonicalSequenceState) -> bool

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=. Read more
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impl Serialize for CanonicalSequenceState

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

Serialize this value into the given Serde serializer. Read more
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impl StructuralPartialEq for CanonicalSequenceState

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