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use std::{
collections::{hash_map::DefaultHasher, HashSet},
hash::{Hash, Hasher},
path::PathBuf,
sync::{Arc, Mutex},
};
use anyhow::{Context, Result};
use bdk::{
bitcoin::{bip32::ExtendedPubKey, Network, Txid},
blockchain::{ElectrumBlockchain, GetHeight},
sled,
template::{Bip44Public, Bip49Public, Bip84Public, Bip86Public},
KeychainKind, SyncOptions, TransactionDetails, Wallet,
};
use log::{debug, error, warn};
use serde::Deserialize;
use crate::blockchain::{get_blockchain, ElectrumConfig};
#[derive(Deserialize, Debug, Clone, Copy)]
#[serde(rename_all = "snake_case")]
pub enum AddressKind {
Legacy,
NestedSegwit,
Segwit,
Taproot,
}
#[derive(Deserialize, Debug)]
pub struct XpubSpec {
name: String,
xpub: String,
kind: Option<AddressKind>,
}
impl XpubSpec {
pub fn kind(&self) -> AddressKind {
self.kind.unwrap_or(AddressKind::Segwit)
}
pub fn xpub(&self) -> &str {
&self.xpub
}
pub fn name(&self) -> &str {
&self.name
}
}
#[derive(Deserialize, Debug, Hash)]
pub struct DescriptorsSpec {
name: String,
primary: String,
change: Option<String>,
}
impl DescriptorsSpec {
pub fn get_hash(&self) -> String {
let mut s = DefaultHasher::new();
self.hash(&mut s);
s.finish().to_string()
}
pub fn primary(&self) -> &str {
&self.primary
}
pub fn change(&self) -> Option<&String> {
self.change.as_ref()
}
pub fn name(&self) -> &str {
&self.name
}
}
#[derive(Deserialize, Debug)]
#[serde(untagged)]
pub enum WalletConfig {
Xpub(XpubSpec),
Descriptors(DescriptorsSpec),
}
impl WalletConfig {
pub fn name(&self) -> &str {
match self {
WalletConfig::Xpub(xpub_spec) => xpub_spec.name(),
WalletConfig::Descriptors(descriptors_spec) => descriptors_spec.name(),
}
}
}
fn get_cache_dir(db_name: &str) -> PathBuf {
dirs::cache_dir()
.unwrap_or(PathBuf::from("cache"))
.join(env!("CARGO_PKG_NAME"))
.join(db_name)
}
fn get_xpub_wallet(xpub_spec: &XpubSpec, network: Network) -> Result<Wallet<sled::Tree>> {
let xpub: ExtendedPubKey = xpub_spec.xpub().parse().unwrap();
let fingerprint = xpub.fingerprint();
let sled = sled::open(get_cache_dir(&fingerprint.to_string()))?.open_tree("wallet")?;
match xpub_spec.kind() {
AddressKind::Legacy => Wallet::new(
Bip44Public(xpub, fingerprint, KeychainKind::External),
Some(Bip44Public(xpub, fingerprint, KeychainKind::Internal)),
network,
sled,
),
AddressKind::NestedSegwit => Wallet::new(
Bip49Public(xpub, fingerprint, KeychainKind::External),
Some(Bip49Public(xpub, fingerprint, KeychainKind::Internal)),
network,
sled,
),
AddressKind::Segwit => Wallet::new(
Bip84Public(xpub, fingerprint, KeychainKind::External),
Some(Bip84Public(xpub, fingerprint, KeychainKind::Internal)),
network,
sled,
),
AddressKind::Taproot => Wallet::new(
Bip86Public(xpub, fingerprint, KeychainKind::External),
Some(Bip86Public(xpub, fingerprint, KeychainKind::Internal)),
network,
sled,
),
}
.with_context(|| format!("invalid xpub wallet '{}'", xpub))
}
fn get_descriptors_wallet(
descriptors_spec: &DescriptorsSpec,
network: Network,
) -> Result<Wallet<sled::Tree>> {
let sled = sled::open(get_cache_dir(&descriptors_spec.get_hash()))?.open_tree("wallet")?;
Wallet::new(
descriptors_spec.primary(),
descriptors_spec.change().map(String::as_ref),
network,
sled,
)
.with_context(|| format!("invalid descriptor wallet '{:?}'", descriptors_spec))
}
fn get_wallet(wallet_config: &WalletConfig, network: Network) -> Result<Wallet<sled::Tree>> {
match &wallet_config {
WalletConfig::Xpub(xpub_spec) => get_xpub_wallet(xpub_spec, network),
WalletConfig::Descriptors(descriptors_spec) => {
get_descriptors_wallet(descriptors_spec, network)
}
}
}
pub struct WalletInfo {
name: String,
wallet: Wallet<sled::Tree>,
old_txs: HashSet<Txid>,
blockchain: ElectrumBlockchain,
}
pub type SafeWalletInfo = Arc<Mutex<WalletInfo>>;
impl WalletInfo {
pub fn name(&self) -> &str {
&self.name
}
pub fn get_height(&self) -> Result<u32, bdk::Error> {
self.blockchain.get_height()
}
pub fn get_network(&self) -> Network {
self.wallet.network()
}
pub fn total_balance(&self) -> Result<u64, bdk::Error> {
self.wallet.get_balance().map(|b| b.get_total())
}
pub fn get_new_txs(&mut self) -> Vec<TransactionDetails> {
debug!("[{}] syncing wallet", self.name);
if let Err(e) = self.wallet.sync(&self.blockchain, SyncOptions::default()) {
warn!("[{}] cannot sync wallet: {:#}", self.name, e);
return Default::default();
}
let tx_list = match self.wallet.list_transactions(false) {
Ok(txs) => txs,
Err(e) => {
warn!("[{}] cannot retrieve transactions: {:#}", self.name, e);
Default::default()
}
};
let new_txs: Vec<TransactionDetails> = tx_list
.iter()
.filter(|&tx| !self.old_txs.contains(&tx.txid))
.cloned()
.collect();
new_txs.iter().for_each(|tx| {
self.old_txs.insert(tx.txid);
});
new_txs
}
}
pub fn get_wallets(
wallet_configs: &[WalletConfig],
electrum_cfg: &ElectrumConfig,
) -> Vec<SafeWalletInfo> {
let mut result: Vec<SafeWalletInfo> = vec![];
for wallet_config in wallet_configs.iter() {
let name = wallet_config.name();
match get_wallet(wallet_config, electrum_cfg.network()) {
Ok(w) => {
result.push(Arc::new(Mutex::new(WalletInfo {
name: name.to_string(),
wallet: w,
old_txs: Default::default(),
blockchain: get_blockchain(electrum_cfg).unwrap(),
})));
}
Err(e) => {
error!("[{}] cannot setup wallet: {:#}", name, e);
}
}
}
result
}
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