Trait HeaderBackend 

pub trait HeaderBackend<Block>: Send + Sync
where
    Block: Block,
{
    // Required methods
    fn header(
        &self,
        hash: <Block as Block>::Hash,
    ) -> Result<Option<<Block as Block>::Header>, Error>;
    fn info(&self) -> Info<Block>;
    fn status(&self, hash: <Block as Block>::Hash) -> Result<BlockStatus, Error>;
    fn number(
        &self,
        hash: <Block as Block>::Hash,
    ) -> Result<Option<<<Block as Block>::Header as Header>::Number>, Error>;
    fn hash(
        &self,
        number: <<Block as Block>::Header as Header>::Number,
    ) -> Result<Option<<Block as Block>::Hash>, Error>;

    // Provided methods
    fn block_hash_from_id(
        &self,
        id: &BlockId<Block>,
    ) -> Result<Option<<Block as Block>::Hash>, Error> { ... }
    fn block_number_from_id(
        &self,
        id: &BlockId<Block>,
    ) -> Result<Option<<<Block as Block>::Header as Header>::Number>, Error> { ... }
    fn expect_header(
        &self,
        hash: <Block as Block>::Hash,
    ) -> Result<<Block as Block>::Header, Error> { ... }
    fn expect_block_number_from_id(
        &self,
        id: &BlockId<Block>,
    ) -> Result<<<Block as Block>::Header as Header>::Number, Error> { ... }
    fn expect_block_hash_from_id(
        &self,
        id: &BlockId<Block>,
    ) -> Result<<Block as Block>::Hash, Error> { ... }
}

Blockchain database header backend. Does not perform any validation.

Required Methods

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

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

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

Get blockchain info.

fn status(&self, hash: <Block as Block>::Hash) -> Result<BlockStatus, Error>

Get block status.

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

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

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

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

Provided Methods

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

Convert an arbitrary block ID into a block hash.

fn block_number_from_id( &self, id: &BlockId<Block>, ) -> Result<Option<<<Block as Block>::Header as Header>::Number>, Error>

Convert an arbitrary block ID into a block hash.

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

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

fn expect_block_number_from_id( &self, id: &BlockId<Block>, ) -> Result<<<Block as Block>::Header as Header>::Number, Error>

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 as Block>::Hash, Error>

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

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl<Block: BlockT> HeaderBackend<Block> for Blockchain<Block>