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const DB_MAGIC: &str = "bdk_wallet_electrum_example";
const SEND_AMOUNT: Amount = Amount::from_sat(5000);
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const STOP_GAP: usize = 50;
const BATCH_SIZE: usize = 5;
use std::io::Write;
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use std::str::FromStr;
use bdk_electrum::{
electrum_client::{self, ElectrumApi},
ElectrumExt,
};
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use bdk_file_store::Store;
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use bdk_wallet::bitcoin::{Address, Amount};
use bdk_wallet::chain::collections::HashSet;
use bdk_wallet::{bitcoin::Network, Wallet};
use bdk_wallet::{KeychainKind, SignOptions};
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fn main() -> Result<(), anyhow::Error> {
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let db_path = std::env::temp_dir().join("bdk-electrum-example");
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let db =
Store::<bdk_wallet::wallet::ChangeSet>::open_or_create_new(DB_MAGIC.as_bytes(), db_path)?;
let external_descriptor = "wpkh(tprv8ZgxMBicQKsPdy6LMhUtFHAgpocR8GC6QmwMSFpZs7h6Eziw3SpThFfczTDh5rW2krkqffa11UpX3XkeTTB2FvzZKWXqPY54Y6Rq4AQ5R8L/84'/1'/0'/0/*)";
let internal_descriptor = "wpkh(tprv8ZgxMBicQKsPdy6LMhUtFHAgpocR8GC6QmwMSFpZs7h6Eziw3SpThFfczTDh5rW2krkqffa11UpX3XkeTTB2FvzZKWXqPY54Y6Rq4AQ5R8L/84'/1'/0'/1/*)";
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let mut wallet = Wallet::new_or_load(
external_descriptor,
Some(internal_descriptor),
db,
Network::Testnet,
)?;
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let address = wallet.next_unused_address(KeychainKind::External)?;
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println!("Generated Address: {}", address);
let balance = wallet.get_balance();
println!("Wallet balance before syncing: {} sats", balance.total());
print!("Syncing...");
let client = electrum_client::Client::new("ssl://electrum.blockstream.info:60002")?;
let request = wallet
.start_full_scan()
.inspect_spks_for_all_keychains({
let mut once = HashSet::<KeychainKind>::new();
move |k, spk_i, _| {
if once.insert(k) {
print!("\nScanning keychain [{:?}]", k)
} else {
print!(" {:<3}", spk_i)
}
}
})
.inspect_spks_for_all_keychains(|_, _, _| std::io::stdout().flush().expect("must flush"));
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let mut update = client
.full_scan(request, STOP_GAP, BATCH_SIZE, false)?
.with_confirmation_time_height_anchor(&client)?;
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let now = std::time::UNIX_EPOCH.elapsed().unwrap().as_secs();
let _ = update.graph_update.update_last_seen_unconfirmed(now);
println!();
wallet.apply_update(update)?;
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wallet.commit()?;
let balance = wallet.get_balance();
println!("Wallet balance after syncing: {} sats", balance.total());
if balance.total() < SEND_AMOUNT {
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println!(
"Please send at least {} sats to the receiving address",
SEND_AMOUNT
);
std::process::exit(0);
}
let faucet_address = Address::from_str("mkHS9ne12qx9pS9VojpwU5xtRd4T7X7ZUt")?
.require_network(Network::Testnet)?;
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let mut tx_builder = wallet.build_tx();
tx_builder
.add_recipient(faucet_address.script_pubkey(), SEND_AMOUNT)
.enable_rbf();
let mut psbt = tx_builder.finish()?;
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let finalized = wallet.sign(&mut psbt, SignOptions::default())?;
assert!(finalized);
let tx = psbt.extract_tx()?;
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client.transaction_broadcast(&tx)?;
println!("Tx broadcasted! Txid: {}", tx.txid());
Ok(())
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}