You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: balanced.rs
    path of file: ./repos/nearcore/tools/congestion-model/src/workload
    
    the code of the file until where you have to start completion: use crate::{GGas, ReceiptDefinition, ShardId, TransactionBuilder, TGAS};

use super::{utils, Producer};

/// Simple transaction producer that sends N receipts from each shard to al
    
    fn produce_one_tx(&self, receiver: ShardId, tx: &mut TransactionBuilder) {
        let receipt = ReceiptDefinition {
            receiver,
            size: self.receipt_size,
            attached_gas: self.attached_gas,
            execution_gas: self.attached_gas,
        };
        let first = tx.add_first_receipt(receipt, self.conversion_gas);
        tx.new_outgoing_receipt(first, utils::refund_receipt(tx.sender_shard()));
    }