Enum DigestItemRef

pub enum DigestItemRef<'a, Hash: 'a> {
    ChangesTrieRoot(&'a Hash),
    PreRuntime(&'a ConsensusEngineId, &'a Vec<u8>),
    Consensus(&'a ConsensusEngineId, &'a Vec<u8>),
    Seal(&'a ConsensusEngineId, &'a Vec<u8>),
    ChangesTrieSignal(&'a ChangesTrieSignal),
    Other(&'a Vec<u8>),
}

A ‘referencing view’ for digest item. Does not own its contents. Used by final runtime implementations for encoding/decoding its log items.

Variants

ChangesTrieRoot(&'a Hash)

Reference to DigestItem::ChangesTrieRoot.

PreRuntime(&'a ConsensusEngineId, &'a Vec<u8>)

A pre-runtime digest.

These are messages from the consensus engine to the runtime, although the consensus engine can (and should) read them itself to avoid code and state duplication. It is erroneous for a runtime to produce these, but this is not (yet) checked.

Consensus(&'a ConsensusEngineId, &'a Vec<u8>)

A message from the runtime to the consensus engine. This should never be generated by the native code of any consensus engine, but this is not checked (yet).

Seal(&'a ConsensusEngineId, &'a Vec<u8>)

Put a Seal on it. This is only used by native code, and is never seen by runtimes.

ChangesTrieSignal(&'a ChangesTrieSignal)

Digest item that contains signal from changes tries manager to the native code.

Other(&'a Vec<u8>)

Any ‘non-system’ digest item, opaque to the native code.

Implementations

impl<'a, Hash> DigestItemRef<'a, Hash>

pub fn as_changes_trie_root(&self) -> Option<&'a Hash>

Cast this digest item into ChangesTrieRoot.

pub fn as_pre_runtime(&self) -> Option<(ConsensusEngineId, &'a [u8])>

Cast this digest item into PreRuntime

pub fn as_consensus(&self) -> Option<(ConsensusEngineId, &'a [u8])>

Cast this digest item into Consensus

pub fn as_seal(&self) -> Option<(ConsensusEngineId, &'a [u8])>

Cast this digest item into Seal

pub fn as_changes_trie_signal(&self) -> Option<&'a ChangesTrieSignal>

Cast this digest item into ChangesTrieSignal.

pub fn as_other(&self) -> Option<&'a [u8]>

Cast this digest item into PreRuntime

pub fn try_as_raw(&self, id: OpaqueDigestItemId<'_>) -> Option<&'a [u8]>

Try to match this digest item to the given opaque item identifier; if it matches, then return the opaque data it contains.

pub fn try_to<T: Decode>(&self, id: OpaqueDigestItemId<'_>) -> Option<T>

Try to match this digest item to the given opaque item identifier; if it matches, then try to cast to the given data type; if that works, return it.

Trait Implementations

impl<'a, Hash: Clone + 'a> Clone for DigestItemRef<'a, Hash>

fn clone(&self) -> DigestItemRef<'a, Hash>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a, Hash> Debug for DigestItemRef<'a, Hash>

where Hash: Debug + 'a,

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

Formats the value using the given formatter.

impl<'a, Hash: Encode> Encode for DigestItemRef<'a, Hash>

fn encode(&self) -> Vec<u8>

Convert self to an owned vector.

fn size_hint(&self) -> usize

If possible give a hint of expected size of the encoding.

fn encode_to<T>(&self, dest: &mut T)

where T: Output + ?Sized,

Convert self to a slice and append it to the destination.

fn using_encoded<R, F>(&self, f: F) -> R

where F: FnOnce(&[u8]) -> R,

Convert self to a slice and then invoke the given closure with it.

fn encoded_size(&self) -> usize

Calculates the encoded size.

impl<'a, Hash: PartialEq + 'a> PartialEq for DigestItemRef<'a, Hash>

fn eq(&self, other: &DigestItemRef<'a, Hash>) -> bool

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a, Hash: Encode> EncodeLike for DigestItemRef<'a, Hash>

impl<'a, Hash: Eq + 'a> Eq for DigestItemRef<'a, Hash>

impl<'a, Hash: 'a> StructuralPartialEq for DigestItemRef<'a, Hash>