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AnchorRetention

zcash_client_backend::data_api::anchor_retention

Struct AnchorRetention 

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

The anchor-retention policy in force while a range of blocks is being added to the wallet: the set of grids whose boundaries are retained, the block spacing that places those boundaries, and the height from which retention applies.

Retention applies only from Self::from_height upward: below the network upgrade that introduces the destination pool there are no migration transfers to anchor, so retaining checkpoints there would consume storage to no purpose.

The policy holds a SET of intervals rather than one because a wallet may owe retention to more than one grid at a time. The note commitment trees are wallet-wide while a pool migration is per-account, so two accounts migrating under different intervals each need their own boundaries kept; and a migration already committed under one grid must keep being retained even if the wallet is later configured with a different one, or the boundaries its transfers are anchored to would be pruned out from under it.

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impl AnchorRetention

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pub fn new( from_height: BlockHeight, spacing: BlockSpacing, interval: AnchorRetentionInterval, ) -> Self

Constructs a retention policy that retains the checkpoint at every boundary of interval on a chain with the given spacing, at or above from_height.

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pub fn union( from_height: BlockHeight, spacing: BlockSpacing, intervals: impl IntoIterator<Item = AnchorRetentionInterval>, ) -> Option<Self>

Constructs a retention policy that retains the checkpoint at every height that is a boundary of ANY of intervals on a chain with the given spacing, at or above from_height. Returns None if intervals is empty, there then being nothing to retain.

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pub fn from_height(&self) -> BlockHeight

The height at or above which anchor retention applies (the activation height of the network upgrade that enables pool migration).

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pub fn intervals(&self) -> &BTreeSet<AnchorRetentionInterval>

The grids whose boundaries are retained as durable anchors.

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pub fn spacing(&self) -> BlockSpacing

The block spacing that places the boundaries of Self::intervals.

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pub fn retains(&self, height: BlockHeight) -> bool

Returns whether the checkpoint at height should be retained as a durable anchor under this policy: height is at or above Self::from_height and is a boundary of at least one of Self::intervals.

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pub fn retained_in_range( &self, range: RangeInclusive<BlockHeight>, ) -> BTreeSet<BlockHeight>

Returns every height in range whose checkpoint this policy retains, ascending.

This is the enumeration form of Self::retains: a height is in the result exactly when range contains it and Self::retains holds for it. It exists so that a caller adding a scanned range of blocks can CREATE the checkpoints the policy will need retained — a boundary block containing no note commitments produces no checkpoint of its own, and a policy can only keep alive a checkpoint that exists.

Trait Implementations§

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impl Clone for AnchorRetention

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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 AnchorRetention

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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 AnchorRetention

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impl PartialEq for AnchorRetention

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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 StructuralPartialEq for AnchorRetention

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