Trait polkadot_service::HeaderMetadata

pub trait HeaderMetadata<Block>where
    Block: Block,{
    type Error: Error;

    fn header_metadata(
        &self,
        hash: <Block as Block>::Hash
    ) -> Result<CachedHeaderMetadata<Block>, Self::Error>;
    fn insert_header_metadata(
        &self,
        hash: <Block as Block>::Hash,
        header_metadata: CachedHeaderMetadata<Block>
    );
    fn remove_header_metadata(&self, hash: <Block as Block>::Hash);
}

Handles header metadata: hash, number, parent hash, etc.

Required Associated Types

type Error: Error

Error used in case the header metadata is not found.

Required Methods

fn header_metadata(
    &self,
    hash: <Block as Block>::Hash
) -> Result<CachedHeaderMetadata<Block>, Self::Error>

fn insert_header_metadata(
    &self,
    hash: <Block as Block>::Hash,
    header_metadata: CachedHeaderMetadata<Block>
)

fn remove_header_metadata(&self, hash: <Block as Block>::Hash)

Implementations on Foreign Types

impl<Block> HeaderMetadata<Block> for Blockchain<Block>where
    Block: Block,

type Error = Error

fn header_metadata(
    &self,
    hash: <Block as Block>::Hash
) -> Result<CachedHeaderMetadata<Block>, <Blockchain<Block> as HeaderMetadata<Block>>::Error>

fn insert_header_metadata(
    &self,
    _hash: <Block as Block>::Hash,
    _metadata: CachedHeaderMetadata<Block>
)

fn remove_header_metadata(&self, _hash: <Block as Block>::Hash)

impl<Block> HeaderMetadata<Block> for BlockchainDb<Block>where
    Block: Block,

type Error = Error

fn header_metadata(
    &self,
    hash: <Block as Block>::Hash
) -> Result<CachedHeaderMetadata<Block>, <BlockchainDb<Block> as HeaderMetadata<Block>>::Error>

fn insert_header_metadata(
    &self,
    hash: <Block as Block>::Hash,
    metadata: CachedHeaderMetadata<Block>
)

fn remove_header_metadata(&self, hash: <Block as Block>::Hash)

Implementors