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add
frontier/ethereum
example (#1557)
* add ethereum example The ethereum config doesn't work with the default PolkadotConfig which this shows how to do. Tested with a frontier node * address grumbles * Update subxt/examples/tx_basic_frontier.rs * Update subxt/examples/tx_basic_frontier.rs
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//! Example to use subxt to talk to substrate-based nodes with ethereum accounts | ||
//! which is not the default for subxt which is why we need to provide a custom config. | ||
//! | ||
//! This example requires to run a local frontier/moonbeam node to work. | ||
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#![allow(missing_docs)] | ||
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use subxt::OnlineClient; | ||
use subxt_signer::eth::{dev, AccountId20, Signature}; | ||
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#[subxt::subxt(runtime_metadata_path = "../artifacts/frontier_metadata_small.scale")] | ||
mod eth_runtime {} | ||
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enum EthRuntimeConfig {} | ||
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impl subxt::Config for EthRuntimeConfig { | ||
type Hash = subxt::utils::H256; | ||
type AccountId = AccountId20; | ||
type Address = AccountId20; | ||
type Signature = Signature; | ||
type Hasher = subxt::config::substrate::BlakeTwo256; | ||
type Header = | ||
subxt::config::substrate::SubstrateHeader<u32, subxt::config::substrate::BlakeTwo256>; | ||
type ExtrinsicParams = subxt::config::SubstrateExtrinsicParams<Self>; | ||
type AssetId = u32; | ||
} | ||
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// This helper makes it easy to use our `AccountId20`'s with generated | ||
// code that expects a generated `eth_runtime::runtime_types::fp_account:AccountId20` type. | ||
impl From<AccountId20> for eth_runtime::runtime_types::fp_account::AccountId20 { | ||
fn from(a: AccountId20) -> Self { | ||
eth_runtime::runtime_types::fp_account::AccountId20(a.0) | ||
} | ||
} | ||
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#[tokio::main] | ||
async fn main() -> Result<(), Box<dyn std::error::Error>> { | ||
let api = OnlineClient::<EthRuntimeConfig>::from_insecure_url("ws://127.0.0.1:9944").await?; | ||
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let alith = dev::alith(); | ||
let baltathar = dev::baltathar(); | ||
let dest = baltathar.account_id(); | ||
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println!("baltathar pub: {}", hex::encode(baltathar.public_key().0)); | ||
println!("baltathar addr: {}", hex::encode(dest)); | ||
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let balance_transfer_tx = eth_runtime::tx() | ||
.balances() | ||
.transfer_allow_death(dest.into(), 10_001); | ||
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let events = api | ||
.tx() | ||
.sign_and_submit_then_watch_default(&balance_transfer_tx, &alith) | ||
.await? | ||
.wait_for_finalized_success() | ||
.await?; | ||
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let transfer_event = events.find_first::<eth_runtime::balances::events::Transfer>()?; | ||
if let Some(event) = transfer_event { | ||
println!("Balance transfer success: {event:?}"); | ||
} | ||
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Ok(()) | ||
} |