Struct IdempotencyKey 

pub struct IdempotencyKey(/* private fields */);

Domain-separated deduplication key for a non-idempotent effect.

Derived with BLAKE3 in derive_key mode from (execution_id, step_id, op_fingerprint). The derivation is injective (length-delimited input) so an attacker-controlled op_fingerprint cannot be crafted to collide with a different (execution_id, step_id) pair. The key is a deduplication discriminator only — never the sole trust basis for skipping a guarded effect.

Examples

use zeph_durable::{ExecutionId, IdempotencyKey, StepId};

let exec = ExecutionId::new();
let a = IdempotencyKey::derive(exec, StepId::new(0), b"transfer:acct-7");
let b = IdempotencyKey::derive(exec, StepId::new(0), b"transfer:acct-7");
let c = IdempotencyKey::derive(exec, StepId::new(1), b"transfer:acct-7");
assert_eq!(a, b, "same inputs derive the same key");
assert_ne!(a, c, "a different step derives a different key");

Implementations

impl IdempotencyKey

pub fn derive( execution_id: ExecutionId, step_id: StepId, op_fingerprint: &[u8], ) -> Self

Derive an idempotency key from the execution identity, step position, and an opaque operation fingerprint.

The fingerprint MUST be derived from non-secret descriptors only (e.g. a tool name and its non-secret arguments); resolved secret material MUST NOT be passed here (INV-6).

The input is length-delimited — len(execution_id) || execution_id || len(step_id) || step_id || op_fingerprint — so the field boundaries are unambiguous and the derivation is injective. The fixed BLAKE3 derive_key context string keeps these keys disjoint from any other BLAKE3 use in the workspace.

pub fn as_bytes(&self) -> &[u8; 32]

Return the 32 raw key bytes.

Trait Implementations

impl Clone for IdempotencyKey

fn clone(&self) -> IdempotencyKey

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for IdempotencyKey

impl Debug for IdempotencyKey

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for IdempotencyKey

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for IdempotencyKey

impl Hash for IdempotencyKey

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for IdempotencyKey

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for IdempotencyKey

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for IdempotencyKey