Function cumulus_client_consensus_common::find_potential_parents

pub async fn find_potential_parents<B: BlockT>(
    params: ParentSearchParams,
    backend: &impl Backend<B>,
    relay_client: &impl RelayChainInterface
) -> Result<Vec<PotentialParent<B>>, RelayChainError>

Perform a recursive search through blocks to find potential parent blocks for a new block.

This accepts a relay-chain block to be used as an anchor and a maximum search depth, along with some arguments for filtering parachain blocks and performs a recursive search for parachain blocks. The search begins at the last included parachain block and returns a set of PotentialParents which could be potential parents of a new block with this relay-parent according to the search parameters.

A parachain block is a potential parent if it is either the last included parachain block, the pending parachain block (when max_depth >= 1), or all of the following hold:

• its parent is a potential parent
• its relay-parent is within ancestry_lookback of the targeted relay-parent.
• its relay-parent is within the same session as the targeted relay-parent.
• the block number is within max_depth blocks of the included block