pub struct GlobalStateTxnSubmitter<I: NodeType> {
    pub global_state_handle: Arc<RwLock<GlobalState<I>>>,
}

impl<I: NodeType> AcceptsTxnSubmits<I> for GlobalStateTxnSubmitter<I> {
    async fn submit_txn(&mut self, txn: <I as NodeType>::Transaction) -> Result<(), BuildError> {
        self.global_state_handle.read()?.submit_txn(txn)
    }
}

    async fn submit_txn(&self, txn: <Types as BuilderType>::Transaction) -> Result<(), BuildError> {
        let tx_msg = TransactionMessage::<Types> {
            tx: txn,
            tx_type: TransactionSource::HotShot,
        };
        self.tx_sender
            .broadcast(MessageType::TransactionMessage(tx_msg))
            .await
            .map(|a| ())
            .map_err(|e| BuildError::Error {
                message: fmt!("failed to send txn"),
            })
    }