mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-25 03:37:56 +00:00
Andrew Jones
46 lines
1.5 KiB
Rust
46 lines
1.5 KiB
Rust
// Copyright 2020 Parity Technologies (UK) Ltd.
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// This file is part of substrate-subxt.
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//
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// subxt is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// subxt is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with substrate-subxt. If not, see <http://www.gnu.org/licenses/>.
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use substrate_subxt::{
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system::System,
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Error,
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KusamaRuntime,
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};
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fn main() {
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async_std::task::block_on(async move {
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env_logger::init();
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let block_hash = fetch_block_hash(1).await;
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match block_hash {
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Ok(Some(hash)) => println!("Block hash for block number 1: {}", hash),
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Ok(None) => println!("Block number 1 not found."),
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Err(_) => eprintln!("Failed to fetch block hash"),
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}
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});
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}
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async fn fetch_block_hash(
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block_number: u32,
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) -> Result<Option<<KusamaRuntime as System>::Hash>, Error> {
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substrate_subxt::ClientBuilder::<KusamaRuntime>::new()
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.set_url("wss://kusama-rpc.polkadot.io")
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.build()
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.await?
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.block_hash(Some(block_number.into()))
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.await
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}
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