pezkuwi-subxt/examples/examples/metadata_compatibility.rs

// Copyright 2019-2022 Parity Technologies (UK) Ltd.
// This file is dual-licensed as Apache-2.0 or GPL-3.0.
// see LICENSE for license details.

//! To run this example, a local polkadot node should be running. Example verified against polkadot polkadot 0.9.25-5174e9ae75b.
//!
//! E.g.
//! ```bash
//! curl "https://github.com/paritytech/polkadot/releases/download/v0.9.25/polkadot" --output /usr/local/bin/polkadot --location
//! polkadot --dev --tmp
//! ```

use subxt::{
    OnlineClient,
    PolkadotConfig,
};

#[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata.scale")]
pub mod polkadot {}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    tracing_subscriber::fmt::init();

    let api = OnlineClient::<PolkadotConfig>::new().await?;

    // Each individual request will be validated against the static code that was
    // used to construct it, if possible. We can also validate the entirety of the
    // statically generated code against some client at a given point in time using
    // this check. If it fails, then there is some breaking change between the metadata
    // used to generate this static code, and the runtime metadata from a node that the
    // client is using.
    polkadot::validate_codegen(&api)?;

    Ok(())
}