mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-05-10 00:38:07 +00:00
Niklas
58 lines
1.7 KiB
Rust
58 lines
1.7 KiB
Rust
// Copyright 2019-2022 Parity Technologies (UK) Ltd.
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// This file is part of 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 subxt. If not, see <http://www.gnu.org/licenses/>.
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use subxt::{
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rpc::SubxtRpcApiClient,
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ClientBuilder,
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Config,
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DefaultConfig,
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DefaultExtra,
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};
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type Hash = <DefaultConfig as Config>::Hash;
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type Header = <DefaultConfig as Config>::Header;
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type Extrinsic = <DefaultConfig as Config>::Header;
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#[subxt::subxt(runtime_metadata_path = "examples/polkadot_metadata.scale")]
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pub mod polkadot {}
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#[async_std::main]
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async fn main() -> Result<(), Box<dyn std::error::Error>> {
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env_logger::init();
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let api = ClientBuilder::new()
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.set_url("wss://rpc.polkadot.io:443")
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.build()
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.await?
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.to_runtime_api::<polkadot::RuntimeApi<DefaultConfig, DefaultExtra<DefaultConfig>>>();
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let block_number = 1;
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let block_hash = SubxtRpcApiClient::<Hash, Header, Extrinsic>::block_hash(
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api.client.rpc().inner(),
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Some(block_number.into()),
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)
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.await?;
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if let Some(hash) = block_hash {
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println!("Block hash for block number {}: {}", block_number, hash);
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} else {
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println!("Block number {} not found.", block_number);
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}
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Ok(())
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}
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