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SpendPolicy

zcash_client_backend::data_api::wallet::input_selection

Struct SpendPolicy 

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

The sources of funds an InputSelector is permitted to draw upon when satisfying a transaction request.

Crossing a shielded pool boundary reduces privacy, so it must be an explicit choice of the caller: the selector only spends notes from the shielded pools named in Self::shielded, and only spends transparent UTXOs when a TransparentSpendPolicy is provided. When a single permitted pool cannot cover the request, the selector may combine the permitted pools (drawing on the legacy Orchard pool last); if no combination of permitted sources suffices it returns InputSelectorError::InsufficientFunds rather than reaching into a pool the caller did not permit.

The default permits every shielded pool present in the build and no transparent spending, preserving the historical fully-shielded behavior while letting a caller restrict the set to, for example, {Orchard} to forbid pool crossing.

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impl SpendPolicy

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pub fn shielded_pools(pools: impl IntoIterator<Item = ShieldedPool>) -> Self

Constructs a policy permitting selection from exactly the given shielded pools, with no transparent spending.

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pub fn permits_shielded(&self, pool: ShieldedPool) -> bool

Returns whether notes may be selected from the given shielded pool.

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pub fn shielded(&self) -> &BTreeSet<ShieldedPool>

Returns the set of shielded pools from which notes may be selected.

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pub fn with_transparent(self, transparent: TransparentSpendPolicy) -> Self

Available on crate feature transparent-inputs only.

Adds a transparent spend policy, permitting transparent UTXOs to be spent as described.

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pub fn transparent(&self) -> Option<&TransparentSpendPolicy>

Available on crate feature transparent-inputs only.

Returns the transparent spend policy, or None if transparent UTXOs may not be spent.

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pub fn with_locked_input_policy(self, policy: LockedInputPolicy) -> Self

Sets how input selection treats locked outputs (default: LockedInputPolicy::Exclude).

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pub fn locked_input_policy(&self) -> &LockedInputPolicy

Returns the policy governing selection of locked outputs.

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pub fn with_note_selection(self, note_selection: NoteSelection) -> Self

Sets how the selector chooses among eligible notes (default: NoteSelection::Accumulate).

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pub fn note_selection(&self) -> NoteSelection

Returns how the selector chooses among eligible notes.

Trait Implementations§

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impl Clone for SpendPolicy

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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 Debug for SpendPolicy

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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 SpendPolicy

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fn default() -> Self

Returns the “default value” for a type. Read more

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