Trait sc_light::blockchain::BlockchainBackend

source · [−]
pub trait BlockchainBackend<Block>: HeaderBackend<Block> + HeaderMetadata<Block, Error = Error> where
    Block: Block, {
    fn body(
        &self, 
        id: BlockId<Block>
    ) -> Result<Option<Vec<<Block as Block>::Extrinsic, Global>>, Error>;

    fn justification(
        &self, 
        id: BlockId<Block>
    ) -> Result<Option<Vec<u8, Global>>, Error>;

    fn last_finalized(&self) -> Result<<Block as Block>::Hash, Error>;

    fn cache(&self) -> Option<Arc<dyn Cache<Block> + 'static>>;

    fn leaves(&self) -> Result<Vec<<Block as Block>::Hash, Global>, Error>;

    fn children(
        &self, 
        parent_hash: <Block as Block>::Hash
    ) -> Result<Vec<<Block as Block>::Hash, Global>, Error>;

    fn extrinsic(
        &self, 
        hash: &<Block as Block>::Hash
    ) -> Result<Option<<Block as Block>::Extrinsic>, Error>;

    fn best_containing(
        &self, 
        target_hash: <Block as Block>::Hash, 
        maybe_max_number: Option<<<Block as Block>::Header as Header>::Number>, 
        import_lock: &RwLock<RawRwLock, ()>
    ) -> Result<Option<<Block as Block>::Hash>, Error> { ... }

    fn have_extrinsic(
        &self, 
        hash: &<Block as Block>::Hash
    ) -> Result<bool, Error> { ... }
}
Expand description

Blockchain database backend. Does not perform any validation.

Required methods

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

Get block justification. Returns None if justification does not exist.

Get last finalized block hash.

Returns data cache reference, if it is enabled on this backend.

Returns hashes of all blocks that are leaves of the block tree. in other words, that have no children, are chain heads. Results must be ordered best (longest, highest) chain first.

Return hashes of all blocks that are children of the block with parent_hash.

Get single extrinsic by hash.

Provided methods

Get the most recent block hash of the best (longest) chains that contain block with the given target_hash.

The search space is always limited to blocks which are in the finalized chain or descendents of it.

If maybe_max_block_number is Some(max_block_number) the search is limited to block numbers <= max_block_number. in other words as if there were no blocks greater max_block_number. Returns Ok(None) if target_hash is not found in search space. TODO: document time complexity of this, see #1444

Check if extrinsic exists.

Implementations on Foreign Types

Implementors