Struct IdempotencyId 

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

Unique identifier for duplicate transaction prevention.

Clients generate an IdempotencyId before their first attempt at a transaction. If the transaction needs to be retried (e.g., network timeout), the client reuses the same ID. The server tracks committed IDs to return the same result for duplicate requests.

Inspired by FoundationDB’s idempotency key design.

FCIS Pattern

This type follows the Functional Core / Imperative Shell pattern:

• from_bytes(): Pure restoration from storage
• from_random_bytes(): Pure construction from bytes (pub(crate))
• generate(): Impure shell that invokes CSPRNG

Implementations

impl IdempotencyId

pub fn from_bytes(bytes: [u8; 16]) -> Self

Restoration from stored bytes (pure).

Use this when loading an IdempotencyId from storage or wire protocol.

pub fn as_bytes(&self) -> &[u8; 16]

Returns the ID as a byte slice.

pub fn generate() -> Self

Generates a new random idempotency ID using the OS CSPRNG.

Panics

Panics if the OS CSPRNG fails, which indicates a catastrophic system error (e.g., no entropy source available).

Trait Implementations

impl Clone for IdempotencyId

fn clone(&self) -> IdempotencyId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for IdempotencyId

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for IdempotencyId

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for IdempotencyId

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

Formats the value using the given formatter.

impl From<[u8; 16]> for IdempotencyId

fn from(bytes: [u8; 16]) -> Self

Converts to this type from the input type.

impl From<IdempotencyId> for [u8; 16]

fn from(id: IdempotencyId) -> Self

Converts to this type from the input type.

impl Hash for IdempotencyId

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 Ord for IdempotencyId

fn cmp(&self, other: &IdempotencyId) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for IdempotencyId

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for IdempotencyId

fn partial_cmp(&self, other: &IdempotencyId) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for IdempotencyId

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for IdempotencyId

impl Eq for IdempotencyId

impl StructuralPartialEq for IdempotencyId