Struct bp_parachains::BestParaHeadHash

pub struct BestParaHeadHash {
    pub at_relay_block_number: RelayBlockNumber,
    pub head_hash: ParaHash,
}

Best known parachain head hash.

Fields

at_relay_block_number: RelayBlockNumber

Number of relay block where this head has been read.

Parachain head is opaque to relay chain. So we can’t simply decode it as a header of parachains and call block_number() on it. Instead, we’re using the fact that parachain head is always built on top of previous head (because it is blockchain) and relay chain always imports parachain heads in order. What it means for us is that at any given finalized relay block B, head of parachain will be ancestor (or the same) of all parachain heads available at descendants of B.

head_hash: ParaHash

Hash of parachain head.

Trait Implementations

impl Clone for BestParaHeadHash

fn clone(&self) -> BestParaHeadHash

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for BestParaHeadHash

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

Formats the value using the given formatter.

impl Decode for BestParaHeadHash

fn decode<__CodecInputEdqy: Input>( __codec_input_edqy: &mut __CodecInputEdqy, ) -> Result<Self, Error>

Attempt to deserialise the value from input.

fn decode_into<I>( input: &mut I, dst: &mut MaybeUninit<Self>, ) -> Result<DecodeFinished, Error>

where I: Input,

Attempt to deserialize the value from input into a pre-allocated piece of memory.

fn skip<I>(input: &mut I) -> Result<(), Error>

where I: Input,

Attempt to skip the encoded value from input.

fn encoded_fixed_size() -> Option<usize>

Returns the fixed encoded size of the type.

impl Encode for BestParaHeadHash

fn size_hint(&self) -> usize

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

fn encode_to<__CodecOutputEdqy: Output + ?Sized>( &self, __codec_dest_edqy: &mut __CodecOutputEdqy, )

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

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

Convert self to an owned vector.

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 MaxEncodedLen for BestParaHeadHash

fn max_encoded_len() -> usize

Upper bound, in bytes, of the maximum encoded size of this item.

impl PartialEq for BestParaHeadHash

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl TypeInfo for BestParaHeadHash

type Identity = BestParaHeadHash

The type identifying for which type info is provided.

fn type_info() -> Type

Returns the static type identifier for Self.

impl EncodeLike for BestParaHeadHash

impl StructuralPartialEq for BestParaHeadHash