Function sc_service::build_offchain_workers

pub fn build_offchain_workers<TBl, TCl>(
    config: &Configuration, 
    spawn_handle: SpawnTaskHandle, 
    client: Arc<TCl>, 
    network: Arc<NetworkService<TBl, <TBl as BlockT>::Hash>>
) -> Option<Arc<OffchainWorkers<TCl, TBl>>> where
    TBl: BlockT,
    TCl: Send + Sync + ProvideRuntimeApi<TBl> + BlockchainEvents<TBl> + 'static,
    <TCl as ProvideRuntimeApi<TBl>>::Api: OffchainWorkerApi<TBl>, 

Build a shared offchain workers instance.