Function gen_rpc_module 

pub fn gen_rpc_module<TBl, TBackend, TCl, TRpc, TExPool>(
    _: GenRpcModuleParams<'_, TBl, TBackend, TCl, TRpc, TExPool>,
) -> Result<RpcModule<()>, Error>
where
    TBl: BlockT,
    TCl: ClientForService<TBl> + ExecutorProvider<TBl> + CallApiAt<TBl> + StorageProvider<TBl, TBackend>,
    TBackend: Backend<TBl> + 'static,
    <TCl as ProvideRuntimeApi<TBl>>::Api: SessionKeys<TBl> + Metadata<TBl>,
    TBl::Hash: Unpin,
    TBl::Header: Unpin,
    TExPool: MaintainedTransactionPool<Block = TBl, Hash = <TBl as BlockT>::Hash> + ?Sized + 'static,

Generate RPC module using provided configuration