Struct polkadot_service::generic::Header

pub struct Header<Number, Hash>
where
    Number: Copy + Into<U256> + TryFrom<U256>,
    Hash: Hash,
{
    pub parent_hash: <Hash as Hash>::Output,
    pub number: Number,
    pub state_root: <Hash as Hash>::Output,
    pub extrinsics_root: <Hash as Hash>::Output,
    pub digest: Digest,
}

Abstraction over a block header for a substrate chain.

Fields

parent_hash: <Hash as Hash>::Output

The parent hash.

number: Number

The block number.

state_root: <Hash as Hash>::Output

The state trie merkle root

extrinsics_root: <Hash as Hash>::Output

The merkle root of the extrinsics.

digest: Digest

A chain-specific digest of data useful for light clients or referencing auxiliary data.

Implementations

impl<Number, Hash> Header<Number, Hash>

where Number: Member + Hash + Copy + MaybeDisplay + AtLeast32BitUnsigned + Codec + Into<U256> + TryFrom<U256>, Hash: Hash,

pub fn hash(&self) -> <Hash as Hash>::Output

Convenience helper for computing the hash of the header without having to import the trait.

impl Header<u64, BlakeTwo256>

pub fn new_from_number( number: <Header<u64, BlakeTwo256> as Header>::Number, ) -> Header<u64, BlakeTwo256>

A new header with the given number and default hash for all other fields.

Trait Implementations

impl<Number, Hash> Clone for Header<Number, Hash>

where Number: Clone + Copy + Into<U256> + TryFrom<U256>, Hash: Clone + Hash, <Hash as Hash>::Output: Clone,

fn clone(&self) -> Header<Number, Hash>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<Number, Hash> Debug for Header<Number, Hash>

where Number: Copy + Into<U256> + TryFrom<U256> + Debug, Hash: Hash + Debug,

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

Formats the value using the given formatter.

impl<Number, Hash> Decode for Header<Number, Hash>

where Number: Copy + Into<U256> + TryFrom<U256> + HasCompact, Hash: Hash, <Hash as Hash>::Output: Decode,

fn decode<__CodecInputEdqy>( __codec_input_edqy: &mut __CodecInputEdqy, ) -> Result<Header<Number, Hash>, Error>

where __CodecInputEdqy: Input,

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<'de, Number, Hash> Deserialize<'de> for Header<Number, Hash>

where Number: Copy + Into<U256> + TryFrom<U256>, Hash: Hash, <Hash as Hash>::Output: Deserialize<'de>,

fn deserialize<__D>( __deserializer: __D, ) -> Result<Header<Number, Hash>, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<Number, Hash> Encode for Header<Number, Hash>

where Number: Copy + Into<U256> + TryFrom<U256> + HasCompact, Hash: Hash, <Hash as Hash>::Output: Encode,

fn size_hint(&self) -> usize

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

fn encode_to<__CodecOutputEdqy>( &self, __codec_dest_edqy: &mut __CodecOutputEdqy, )

where __CodecOutputEdqy: Output + ?Sized,

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<Number, Hash> Header for Header<Number, Hash>

where Number: BlockNumber, Hash: Hash,

type Number = Number

Header number.

type Hash = <Hash as Hash>::Output

Header hash type

type Hashing = Hash

Hashing algorithm

fn new( number: <Header<Number, Hash> as Header>::Number, extrinsics_root: <Header<Number, Hash> as Header>::Hash, state_root: <Header<Number, Hash> as Header>::Hash, parent_hash: <Header<Number, Hash> as Header>::Hash, digest: Digest, ) -> Header<Number, Hash>

Creates new header.

fn number(&self) -> &<Header<Number, Hash> as Header>::Number

Returns a reference to the header number.

fn set_number(&mut self, num: <Header<Number, Hash> as Header>::Number)

Sets the header number.

fn extrinsics_root(&self) -> &<Header<Number, Hash> as Header>::Hash

Returns a reference to the extrinsics root.

fn set_extrinsics_root(&mut self, root: <Header<Number, Hash> as Header>::Hash)

Sets the extrinsic root.

fn state_root(&self) -> &<Header<Number, Hash> as Header>::Hash

Returns a reference to the state root.

fn set_state_root(&mut self, root: <Header<Number, Hash> as Header>::Hash)

Sets the state root.

fn parent_hash(&self) -> &<Header<Number, Hash> as Header>::Hash

Returns a reference to the parent hash.

fn set_parent_hash(&mut self, hash: <Header<Number, Hash> as Header>::Hash)

Sets the parent hash.

fn digest(&self) -> &Digest

Returns a reference to the digest.

fn digest_mut(&mut self) -> &mut Digest

Get a mutable reference to the digest.

fn hash(&self) -> Self::Hash

Returns the hash of the header.

impl<Number, Hash> PartialEq for Header<Number, Hash>

where Number: PartialEq + Copy + Into<U256> + TryFrom<U256>, Hash: PartialEq + Hash, <Hash as Hash>::Output: PartialEq,

fn eq(&self, other: &Header<Number, Hash>) -> 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<Number, Hash> Serialize for Header<Number, Hash>

where Number: Copy + Into<U256> + TryFrom<U256>, Hash: Hash, <Hash as Hash>::Output: Serialize,

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<Number, Hash> TypeInfo for Header<Number, Hash>

where Number: Copy + Into<U256> + TryFrom<U256> + HasCompact + TypeInfo + 'static, Hash: Hash + 'static, <Hash as Hash>::Output: TypeInfo + 'static,

type Identity = Header<Number, Hash>

The type identifying for which type info is provided.

fn type_info() -> Type

Returns the static type identifier for Self.

impl<Number, Hash> EncodeLike for Header<Number, Hash>

where Number: Copy + Into<U256> + TryFrom<U256> + HasCompact, Hash: Hash, <Hash as Hash>::Output: Encode,

impl<Number, Hash> Eq for Header<Number, Hash>

where Number: Eq + Copy + Into<U256> + TryFrom<U256>, Hash: Eq + Hash, <Hash as Hash>::Output: Eq,

impl<Number, Hash> StructuralPartialEq for Header<Number, Hash>

where Number: Copy + Into<U256> + TryFrom<U256>, Hash: Hash,