Trait Poll 

pub trait Poll {
    // Required methods
    fn poll_chain_tip<'a>(
        &'a self,
        best_known_chain_tip: ValidatedBlockHeader,
    ) -> impl Future<Output = BlockSourceResult<ChainTip>> + Send + 'a;
    fn look_up_previous_header<'a>(
        &'a self,
        header: &'a ValidatedBlockHeader,
    ) -> impl Future<Output = BlockSourceResult<ValidatedBlockHeader>> + Send + 'a;
    fn fetch_block<'a>(
        &'a self,
        header: &'a ValidatedBlockHeader,
    ) -> impl Future<Output = BlockSourceResult<ValidatedBlock>> + Send + 'a;
    fn get_header<'a>(
        &'a self,
        block_hash: &'a BlockHash,
        height_hint: Option<u32>,
    ) -> impl Future<Output = BlockSourceResult<ValidatedBlockHeader>> + Send + 'a;
}

The Poll trait defines behavior for polling block sources for a chain tip and retrieving related chain data. It serves as an adapter for BlockSource.

ChainPoller adapts a single BlockSource, while any other implementations of Poll are required to be built in terms of it to ensure chain data validity.

Required Methods

fn poll_chain_tip<'a>( &'a self, best_known_chain_tip: ValidatedBlockHeader, ) -> impl Future<Output = BlockSourceResult<ChainTip>> + Send + 'a

Returns a chain tip in terms of its relationship to the provided chain tip.

fn look_up_previous_header<'a>( &'a self, header: &'a ValidatedBlockHeader, ) -> impl Future<Output = BlockSourceResult<ValidatedBlockHeader>> + Send + 'a

Returns the header that preceded the given header in the chain.

fn fetch_block<'a>( &'a self, header: &'a ValidatedBlockHeader, ) -> impl Future<Output = BlockSourceResult<ValidatedBlock>> + Send + 'a

Returns the block associated with the given header.

fn get_header<'a>( &'a self, block_hash: &'a BlockHash, height_hint: Option<u32>, ) -> impl Future<Output = BlockSourceResult<ValidatedBlockHeader>> + Send + 'a

Returns the header for a given hash and optional height hint.

Dyn Compatibility

This trait is not dyn compatible.

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

Implementors

impl<B: Deref<Target = T> + Sized + Send + Sync, T: BlockSource + ?Sized> Poll for ChainPoller<B, T>