Trait polkadot_service::HeaderProvider

pub trait HeaderProvider<Block, Error = Error>: Send + Sync + 'staticwhere
    Block: BlockT,
    Error: Debug + Send + Sync + 'static,{
    fn header(
        &self,
        hash: <Block as BlockT>::Hash
    ) -> Result<Option<<Block as BlockT>::Header>, Error>;
    fn number(
        &self,
        hash: <Block as BlockT>::Hash
    ) -> Result<Option<<<Block as BlockT>::Header as HeaderT>::Number>, Error>;
}

Provides the header and block number for a hash.

Decouples sc_client_api::Backend and sp_blockchain::HeaderBackend.

Required Methods

fn header(
    &self,
    hash: <Block as BlockT>::Hash
) -> Result<Option<<Block as BlockT>::Header>, Error>

Obtain the header for a hash.

fn number(
    &self,
    hash: <Block as BlockT>::Hash
) -> Result<Option<<<Block as BlockT>::Header as HeaderT>::Number>, Error>

Obtain the block number for a hash.

Implementors

impl<Block, T> HeaderProvider<Block, Error> for Twhere
    Block: BlockT,
    T: HeaderBackend<Block> + 'static,