hiero-sdk 0.42.1

The SDK for interacting with Hedera Hashgraph.
Documentation 
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// SPDX-License-Identifier: Apache-2.0

use assert_matches::assert_matches;
use clap::Parser;
use hiero_sdk::{AccountId, Client, PrivateKey, TopicCreateTransaction};

#[derive(Parser, Debug)]
struct Args {
    #[clap(long, env)]
    operator_account_id: AccountId,

    #[clap(long, env)]
    operator_key: PrivateKey,
}

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    let _ = dotenvy::dotenv();
    let args = Args::parse();

    let client = Client::for_testnet();

    client.set_operator(args.operator_account_id, args.operator_key);

    let receipt = TopicCreateTransaction::new()
        .execute(&client)
        .await?
        .get_receipt(&client)
        .await?;

    let new_topic_id = assert_matches!(receipt.topic_id, Some(id) => id);

    println!("topic address = {new_topic_id}");

    Ok(())
}