mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-22 06:47:58 +00:00
Andrew Jones
69 lines
2.2 KiB
Rust
69 lines
2.2 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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//! To run this example, a local polkadot node should be running.
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//!
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//! E.g.
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//! ```bash
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//! curl "https://github.com/paritytech/polkadot/releases/download/v0.9.11/polkadot" --output /usr/local/bin/polkadot --location
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//! polkadot --dev --tmp
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//! ```
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use sp_keyring::AccountKeyring;
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use subxt::{
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ClientBuilder,
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EventSubscription,
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PairSigner,
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};
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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 signer = PairSigner::new(AccountKeyring::Alice.pair());
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let dest = AccountKeyring::Bob.to_account_id().into();
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let api = ClientBuilder::new()
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.build()
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.await?
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.to_runtime_api::<polkadot::RuntimeApi<polkadot::DefaultConfig>>();
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let sub = api.client.rpc().subscribe_events().await?;
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let decoder = api.client.events_decoder();
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let mut sub = EventSubscription::<polkadot::DefaultConfig>::new(sub, decoder);
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sub.filter_event::<polkadot::balances::events::Transfer>();
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api.tx()
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.balances()
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.transfer(dest, 10_000)
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.sign_and_submit(&signer)
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.await?;
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let raw = sub.next().await.unwrap().unwrap();
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let event = <polkadot::balances::events::Transfer as codec::Decode>::decode(
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&mut &raw.data[..],
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);
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if let Ok(e) = event {
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println!("Balance transfer success: value: {:?}", e.2);
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} else {
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println!("Failed to subscribe to Balances::Transfer Event");
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}
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Ok(())
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}
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