Struct KernelRecord 

pub struct KernelRecord { /* private fields */ }

One durable transition (§8.1).

Every field is private and every digest is computed by KernelRecord::chain: there is no constructor that takes a digest, so “the host recomputed the hash and disagreed” is not a reachable state. KernelRecord::record_bytes is what the host hands to KernelJournal::compare_and_append, and KernelRecord::expected_head is the CAS precondition that goes with it.

Implementations

impl KernelRecord

pub fn chain<S>( previous: Option<&KernelRecord>, input: &NormalizedInput, planned_step: &S, ) -> Result<KernelRecord, RecordError>

where S: Serialize + ?Sized,

Build the next record of an operation.

previous = None builds the genesis record: step_seq 0, no previous digest, and a payload that must be the resolved configuration. Every later record must carry a non-genesis payload, the same operation_id, and links to its predecessor’s digest — a second ConfigureOperation has no legal position in a chain (§6.1: it is admissible only in Created).

pub fn anchor(&self) -> ChainAnchor

The three facts a successor reads off this record.

pub fn chain_after<S>( previous: Option<&ChainAnchor>, input: &NormalizedInput, planned_step: &S, ) -> Result<KernelRecord, RecordError>

where S: Serialize + ?Sized,

Self::chain, anchored on the predecessor’s facts rather than on the predecessor.

The distinction is what makes §12.2’s bounded-tail restore possible at all: a restored runtime replays the tail on top of a checkpoint whose covered prefix may already have been pruned, so the record before the first tail entry no longer exists anywhere — only its digest and its sequence do, and the checkpoint carries them.

pub fn operation_id(&self) -> &OperationId

pub fn input_id(&self) -> &InputId

pub fn step_seq(&self) -> WireU64

pub fn previous_record_digest(&self) -> Option<&Digest>

pub fn expected_head(&self) -> Option<&Digest>

The CAS precondition for appending this record (§8.2 line 5). None means “the operation has no journal head yet”, which only its genesis record may assert.

pub fn canonical_input(&self) -> &CanonicalBytes

pub fn input_digest(&self) -> &Digest

pub fn step_digest(&self) -> &Digest

pub fn record_digest(&self) -> &Digest

pub fn is_genesis(&self) -> bool

pub fn record_bytes(&self) -> CanonicalBytes

Canonical bytes of the whole record — what the journal stores and what Self::from_record_bytes reads back.

pub fn from_record_bytes(bytes: &[u8]) -> Result<KernelRecord, RecordError>

Decode a record from its journal bytes, verifying every digest it carries.

pub fn normalized_input(&self) -> Result<NormalizedInput, RecordError>

Decode the normalised input this record froze — the entry point of a rebuild (§12.2).

pub fn verify(&self) -> Result<(), RecordError>

Recompute this record’s own digests from the bytes it carries.

pub fn verify_step<S>(&self, planned_step: &S) -> Result<(), RecordError>

where S: Serialize + ?Sized,

Verify a rebuilt step against the digest this record froze (§8.1).

pub fn verify_follows( &self, previous: Option<&KernelRecord>, ) -> Result<(), RecordError>

Verify this record follows previous (None = it claims to be a genesis).

Trait Implementations

impl Clone for KernelRecord

fn clone(&self) -> KernelRecord

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for KernelRecord

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for KernelRecord

fn deserialize<D>( deserializer: D, ) -> Result<KernelRecord, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for KernelRecord

impl PartialEq for KernelRecord

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for KernelRecord

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for KernelRecord