[−][src]Trait sp_blockchain::HeaderBackend

pub trait HeaderBackend<Block: BlockT>: Send + Sync {
    fn header(&self, id: BlockId<Block>) -> Result<Option<Block::Header>>;

    fn info(&self) -> Info<Block>;

    fn status(&self, id: BlockId<Block>) -> Result<BlockStatus>;

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

    fn hash(&self, number: NumberFor<Block>) -> Result<Option<Block::Hash>>;

    fn block_hash_from_id(
        &self, 
        id: &BlockId<Block>
    ) -> Result<Option<Block::Hash>> { ... }

    fn block_number_from_id(
        &self, 
        id: &BlockId<Block>
    ) -> Result<Option<NumberFor<Block>>> { ... }

    fn expect_header(&self, id: BlockId<Block>) -> Result<Block::Header> { ... }

    fn expect_block_number_from_id(
        &self, 
        id: &BlockId<Block>
    ) -> Result<NumberFor<Block>> { ... }

    fn expect_block_hash_from_id(
        &self, 
        id: &BlockId<Block>
    ) -> Result<Block::Hash> { ... }
}

Blockchain database header backend. Does not perform any validation.

Required methods

fn header(&self, id: BlockId<Block>) -> Result<Option<Block::Header>>

Get block header. Returns None if block is not found.

fn info(&self) -> Info<Block>

Get blockchain info.

fn status(&self, id: BlockId<Block>) -> Result<BlockStatus>

Get block status.

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

Get block number by hash. Returns None if the header is not in the chain.

fn hash(&self, number: NumberFor<Block>) -> Result<Option<Block::Hash>>

Get block hash by number. Returns None if the header is not in the chain.

Loading content...

Provided methods

fn block_hash_from_id(&self, id: &BlockId<Block>) -> Result<Option<Block::Hash>>

Convert an arbitrary block ID into a block hash.

fn block_number_from_id(
    &self,
    id: &BlockId<Block>
) -> Result<Option<NumberFor<Block>>>

Convert an arbitrary block ID into a block hash.

fn expect_header(&self, id: BlockId<Block>) -> Result<Block::Header>

Get block header. Returns UnknownBlock error if block is not found.

fn expect_block_number_from_id(
    &self,
    id: &BlockId<Block>
) -> Result<NumberFor<Block>>

Convert an arbitrary block ID into a block number. Returns UnknownBlock error if block is not found.

fn expect_block_hash_from_id(&self, id: &BlockId<Block>) -> Result<Block::Hash>

Convert an arbitrary block ID into a block hash. Returns UnknownBlock error if block is not found.

Loading content...

Implementors

Loading content...