Struct LedgerPin 

pub struct LedgerPin {
    pub head: Option<LedgerHead>,
    pub high_water: Option<LedgerHighWater>,
}

A record’s chain head and high-water mark, read together (issue #2323).

The two are what an audit posture pins outside the database, and they are only meaningful as a pair: the head hash is what a rewritten chain disagrees with, and the mark is what proves no revision is missing from the end. Reading them with two separate calls lets an ordinary append land in between, so an auditor can hold a head at sequence N beside a mark at N+1 and read a concurrent write as a truncation. This type exists so the pair always comes from one statement, and one snapshot.

Either field is None for a record that has neither — one never written, or one predating the day its model was ledgered. A high_water of None beside a Some head is the state LedgerBreak::HighWaterMissing reports; this type does not judge, it reports what is stored.

Fields

head: Option<LedgerHead>

The newest revision’s sequence number and hash.

high_water: Option<LedgerHighWater>

The out-of-band high-water mark.

Trait Implementations

impl Clone for LedgerPin

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 LedgerPin

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for LedgerPin

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for LedgerPin

impl PartialEq for LedgerPin

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for LedgerPin

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for LedgerPin