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LockOwner

zcash_client_backend::data_api::locking

Struct LockOwner 

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pub struct LockOwner(/* private fields */);
Expand description

An opaque token identifying the holder of an output lock.

A caller that locks outputs (directly via OutputLockStore::lock_outputs, or through a proposal-creation function’s lock request) supplies an owner token and must retain it: the token is what authorizes releasing the locks (OutputLockStore::unlock_output, unlock_proposal_inputs) and what makes re-locking idempotent (an owner may re-acquire or extend its own active lock, for example when retrying a flow after a crash, while a different owner’s lock attempt fails until the lock expires).

The token is not a cryptographic secret: everything that can reach the wallet database can read it. It exists to prevent accidental cross-flow interference between concurrent in-process operations, not to protect against an adversary with database access.

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impl LockOwner

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pub const fn new(bytes: [u8; 32]) -> Self

Constructs a LockOwner from the given bytes.

Callers that persist their own operation state may derive a stable token from it; all others should prefer LockOwner::random.

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pub fn random<R>(rng: &mut R) -> Self
where R: Rng,

Generates a fresh random LockOwner.

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

Returns the byte representation of this token.

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impl Clone for LockOwner

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fn clone(&self) -> Self

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 Copy for LockOwner

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impl Debug for LockOwner

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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 Eq for LockOwner

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impl From<TxId> for LockOwner

A transaction id may serve as a lock owner.

This is the right owner choice for flows that hold a durable transaction identity while their locks are alive; most notably a persisted PCZT, whose v5 txid is fixed once its effecting data is final. Deriving the owner from the txid lets such a flow re-derive its token after a restart and release (or re-acquire) exactly its own locks.

It is NOT a suitable owner for proposal-time locking in general: at proposal creation no transaction exists yet, a multi-step proposal builds several transactions, and a transaction rebuilt after a crash generally has a different txid, which would defeat the idempotent same-owner re-lock. Flows without a durable transaction identity should use LockOwner::random and retain the token.

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fn from(txid: TxId) -> Self

Converts to this type from the input type.
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impl Hash for LockOwner

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for LockOwner

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

This method returns an Ordering between self and other. Read more
1.21.0 (const: unstable) · Source§

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

Compares and returns the maximum of two values. Read more
1.21.0 (const: unstable) · Source§

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

Compares and returns the minimum of two values. Read more
1.50.0 (const: unstable) · Source§

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

Restrict a value to a certain interval. Read more
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fn clamp_to<R>(self, range: R) -> Self
where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)
Restrict a value to a certain range. Read more
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impl PartialEq for LockOwner

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fn eq(&self, other: &Self) -> 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 PartialOrd for LockOwner

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

This method returns an ordering between self and other values if one exists. Read more
1.0.0 (const: unstable) · Source§

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

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
1.0.0 (const: unstable) · Source§

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

Tests greater than (for self and other) and is used by the > operator. Read more
1.0.0 (const: unstable) · Source§

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

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

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🔬This is a nightly-only experimental API. (clone_to_uninit)
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