Function sc_finality_grandpa::run_grandpa_observer

pub fn run_grandpa_observer<BE, Block: BlockT, Client, N, SC>(
    config: Config, 
    link: LinkHalf<Block, Client, SC>, 
    network: N
) -> Result<impl Future<Output = ()> + Send> where
    BE: Backend<Block> + Unpin + 'static,
    N: NetworkT<Block>,
    SC: SelectChain<Block>,
    NumberFor<Block>: BlockNumberOps,
    Client: ClientForGrandpa<Block, BE> + 'static, 

Run a GRANDPA observer as a task, the observer will finalize blocks only by listening for and validating GRANDPA commits instead of following the full protocol. Provide configuration and a link to a block import worker that has already been instantiated with block_import. NOTE: this is currently not part of the crate’s public API since we don’t consider it stable enough to use on a live network.