hotshot_query_service::data_source::fetching::header

Function fetch_header_and_then

Source 
pub(super) async fn fetch_header_and_then<Types, S, P>(
    tx: &mut impl AvailabilityStorage<Types>,
    req: BlockId<Types>,
    callback: HeaderCallback<Types, S, P>,
) -> Result<()>
where
    Types: NodeType,
    Header<Types>: QueryableHeader<Types>,
    Payload<Types>: QueryablePayload<Types>,
    S: VersionedDataSource + 'static,
    for<'a> S::Transaction<'a>: UpdateAvailabilityStorage<Types>,
    for<'a> S::ReadOnly<'a>: AvailabilityStorage<Types> + NodeStorage<Types> + PrunedHeightStorage,
    P: AvailabilityProvider<Types>,