mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-07-01 01:57:24 +00:00
James Wilson
4144a769d5
* make subscription stream generic in EventSubscription * rename to EventSub/FinalizedEventSub * wip fix some lifetimes so that event sub can depend on client in stream * Cargo fmt + comment tweaks * Add another comment * factor out prev block header fetching into a separate function to tidy * add a comment * remove ListOrValue as it's unused * Into<u128> on BlockNumber to simplify things * clippy * Fix an example and clippy * simplify iterator now we are Into<u128> * Into<u64> instead because it needs serializing, and test core logic * Tweak missing block test to fill in >=2 holes * tweak a comment
60 lines
1.8 KiB
Rust
60 lines
1.8 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. Example verified against polkadot 0.9.13-82616422d0-aarch64-macos.
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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/v0.9.13/polkadot" --output /usr/local/bin/polkadot --location
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//! polkadot --dev --tmp
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//! ```
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use subxt::{
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ClientBuilder,
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DefaultConfig,
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DefaultExtra,
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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 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 = 1u32;
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let block_hash = api
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.client
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.rpc()
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.block_hash(Some(block_number.into()))
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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 {block_number} not found.");
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}
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Ok(())
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}
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