mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-22 21:58:00 +00:00
James Wilson
b069c4425a
* WIP second pass over light client code for simpler API * First pass new light client * pub(crate) LightClientRpc::new_raw(), and fmt * Update examples and add back a way to configure boot nodes and fetch chainspec from a URL * Fix light client examples * remove unused deps and tidy lightclient feature flags * fix wasm error * LightClientRpc can be cloned * update light client tests * Other small fixes * exclude mod unless jsonrpsee * Fix wasm-lightclient-tests * add back docsrs bit and web+native feature flag compile error * update book and light client example names * fix docs
59 lines
2.3 KiB
Rust
59 lines
2.3 KiB
Rust
#![allow(missing_docs)]
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use subxt::utils::fetch_chainspec_from_rpc_node;
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use subxt::{
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client::OnlineClient,
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lightclient::{ChainConfig, LightClient},
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PolkadotConfig,
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};
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use subxt_signer::sr25519::dev;
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// Generate an interface that we can use from the node's metadata.
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#[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_small.scale")]
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pub mod polkadot {}
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#[tokio::main]
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async fn main() -> Result<(), Box<dyn std::error::Error>> {
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// The smoldot logs are informative:
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tracing_subscriber::fmt::init();
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// Use a utility function to obtain a chain spec from a locally running node:
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let chain_spec = fetch_chainspec_from_rpc_node("ws://127.0.0.1:9944").await?;
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// Configure the bootnodes of this chain spec. In this case, because we start one
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// single node, the bootnodes must be overwritten for the light client to connect
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// to the local node.
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//
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// The `12D3KooWEyoppNCUx8Yx66oV9fJnriXwCcXwDDUA2kj6vnc6iDEp` is the P2P address
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// from a local polkadot node starting with
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// `--node-key 0000000000000000000000000000000000000000000000000000000000000001`
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let chain_config = ChainConfig::chain_spec(chain_spec.get()).set_bootnodes([
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"/ip4/127.0.0.1/tcp/30333/p2p/12D3KooWEyoppNCUx8Yx66oV9fJnriXwCcXwDDUA2kj6vnc6iDEp",
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])?;
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// Start the light client up, establishing a connection to the local node.
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let (_light_client, chain_rpc) = LightClient::relay_chain(chain_config)?;
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let api = OnlineClient::<PolkadotConfig>::from_rpc_client(chain_rpc).await?;
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// Build a balance transfer extrinsic.
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let dest = dev::bob().public_key().into();
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let balance_transfer_tx = polkadot::tx().balances().transfer_allow_death(dest, 10_000);
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// Submit the balance transfer extrinsic from Alice, and wait for it to be successful
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// and in a finalized block. We get back the extrinsic events if all is well.
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let from = dev::alice();
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let events = api
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.tx()
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.sign_and_submit_then_watch_default(&balance_transfer_tx, &from)
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.await?
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.wait_for_finalized_success()
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.await?;
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// Find a Transfer event and print it.
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let transfer_event = events.find_first::<polkadot::balances::events::Transfer>()?;
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if let Some(event) = transfer_event {
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println!("Balance transfer success: {event:?}");
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}
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Ok(())
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}
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