[−][src]Trait sc_light::blockchain::BlockchainBackend
Blockchain database backend. Does not perform any validation.
Required methods
fn body(
&self,
id: BlockId<Block>
) -> Result<Option<Vec<<Block as Block>::Extrinsic>>, Error>
&self,
id: BlockId<Block>
) -> Result<Option<Vec<<Block as Block>::Extrinsic>>, Error>
Get block body. Returns None
if block is not found.
fn justification(&self, id: BlockId<Block>) -> Result<Option<Vec<u8>>, Error>
Get block justification. Returns None
if justification does not exist.
fn last_finalized(&self) -> Result<<Block as Block>::Hash, Error>
Get last finalized block hash.
fn cache(&self) -> Option<Arc<dyn Cache<Block> + 'static>>
Returns data cache reference, if it is enabled on this backend.
fn leaves(&self) -> Result<Vec<<Block as Block>::Hash>, Error>
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.
fn children(
&self,
parent_hash: <Block as Block>::Hash
) -> Result<Vec<<Block as Block>::Hash>, Error>
&self,
parent_hash: <Block as Block>::Hash
) -> Result<Vec<<Block as Block>::Hash>, Error>
Return hashes of all blocks that are children of the block with parent_hash
.
Provided methods
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>
&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>
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
Implementations on Foreign Types
impl<Block> Backend<Block> for Blockchain<Block> where
Block: Block,
[src]
Block: Block,
fn body(
&self,
id: BlockId<Block>
) -> Result<Option<Vec<<Block as Block>::Extrinsic>>, Error>
[src]
&self,
id: BlockId<Block>
) -> Result<Option<Vec<<Block as Block>::Extrinsic>>, Error>
fn justification(&self, id: BlockId<Block>) -> Result<Option<Vec<u8>>, Error>
[src]
fn last_finalized(&self) -> Result<<Block as Block>::Hash, Error>
[src]
fn cache(&self) -> Option<Arc<dyn Cache<Block> + 'static>>
[src]
fn leaves(&self) -> Result<Vec<<Block as Block>::Hash>, Error>
[src]
fn children(
&self,
_parent_hash: <Block as Block>::Hash
) -> Result<Vec<<Block as Block>::Hash>, Error>
[src]
&self,
_parent_hash: <Block as Block>::Hash
) -> Result<Vec<<Block as Block>::Hash>, Error>
Implementors
impl<S, Block> Backend<Block> for sc_light::blockchain::Blockchain<S> where
Block: BlockT,
S: Storage<Block>,
[src]
Block: BlockT,
S: Storage<Block>,
fn body(
&self,
_id: BlockId<Block>
) -> ClientResult<Option<Vec<Block::Extrinsic>>>
[src]
&self,
_id: BlockId<Block>
) -> ClientResult<Option<Vec<Block::Extrinsic>>>
fn justification(
&self,
_id: BlockId<Block>
) -> ClientResult<Option<Justification>>
[src]
&self,
_id: BlockId<Block>
) -> ClientResult<Option<Justification>>