Struct HeaderSnapshot 

pub struct HeaderSnapshot { /* private fields */ }

One pass’s view of the active chain: the tip and the headers at the heights the pass named, read from the header service through the wallet’s services. Fails closed: a height that was not read has no answer, a read that failed is a fault, and with no tip nothing checks.

Implementations

impl HeaderSnapshot

pub async fn take<V: WalletServices + ?Sized>( services: &V, heights: impl IntoIterator<Item = Height>, ) -> Self

Read the tip and the headers at heights.

pub fn unread() -> Self

A snapshot of nothing: no tip, no header. Every check fails closed.

pub async fn extend<V: WalletServices + ?Sized>( &mut self, services: &V, heights: impl IntoIterator<Item = Height>, )

Read the headers at heights that this snapshot does not hold yet.

pub fn tip(&self) -> Option<(Height, &str)>

The tip’s height and hash, when the header service gave one.

Trait Implementations

impl Clone for HeaderSnapshot

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for HeaderSnapshot

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

Formats the value using the given formatter.

impl Headers for HeaderSnapshot

fn header_at(&self, height: Height) -> Result<Option<Header>, HeaderError>

Look up an active header, or no answer while behind or unverified.

fn tip_height(&self) -> Result<Height, HeaderError>

The active height from the same snapshot.

fn check(&self, proof: Proof) -> Result<CheckedProof, CheckError>

Reduce a bound SDK proof and check it against the active header. Tracker transitions always invoke this default implementation through a snapshot wrapper, so host overrides cannot bypass current lookups.