mirror of
https://github.com/comit-network/xmr-btc-swap.git
synced 2024-08-22 02:06:01 +00:00
160 lines
5.0 KiB
Rust
160 lines
5.0 KiB
Rust
use anyhow::{anyhow, Context, Result};
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use serde::{de::DeserializeOwned, Deserialize, Serialize};
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use std::path::Path;
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pub struct Database {
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db: sled::Db,
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}
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impl Database {
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const LAST_STATE_KEY: &'static str = "latest_state";
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pub fn open(path: &Path) -> Result<Self> {
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let path = path
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.to_str()
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.ok_or_else(|| anyhow!("The path is not utf-8 valid: {:?}", path))?;
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let db = sled::open(path).with_context(|| format!("Could not open the DB at {}", path))?;
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Ok(Database { db })
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}
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pub async fn insert_latest_state<T>(&self, state: &T) -> Result<()>
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where
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T: Serialize + DeserializeOwned,
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{
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let key = serialize(&Self::LAST_STATE_KEY)?;
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let new_value = serialize(&state).context("Could not serialize new state value")?;
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let old_value = self.db.get(&key)?;
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self.db
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.compare_and_swap(key, old_value, Some(new_value))
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.context("Could not write in the DB")?
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.context("Stored swap somehow changed, aborting saving")?; // let _ =
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self.db
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.flush_async()
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.await
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.map(|_| ())
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.context("Could not flush db")
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}
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pub fn get_latest_state<T>(&self) -> anyhow::Result<T>
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where
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T: DeserializeOwned,
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{
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let key = serialize(&Self::LAST_STATE_KEY)?;
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let encoded = self
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.db
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.get(&key)?
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.ok_or_else(|| anyhow!("State does not exist {:?}", key))?;
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let state = deserialize(&encoded).context("Could not deserialize state")?;
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Ok(state)
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}
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}
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pub fn serialize<T>(t: &T) -> anyhow::Result<Vec<u8>>
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where
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T: Serialize,
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{
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Ok(serde_cbor::to_vec(t)?)
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}
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pub fn deserialize<T>(v: &[u8]) -> anyhow::Result<T>
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where
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T: DeserializeOwned,
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{
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Ok(serde_cbor::from_slice(&v)?)
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}
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#[cfg(test)]
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mod tests {
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#![allow(non_snake_case)]
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use super::*;
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use bitcoin::SigHash;
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use curve25519_dalek::scalar::Scalar;
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use ecdsa_fun::fun::rand_core::OsRng;
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use std::str::FromStr;
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use xmr_btc::serde::{
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bitcoin_amount, cross_curve_dleq_scalar, ecdsa_fun_signature, monero_private_key,
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};
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#[derive(Debug, Serialize, Deserialize, PartialEq)]
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pub struct TestState {
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A: xmr_btc::bitcoin::PublicKey,
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a: xmr_btc::bitcoin::SecretKey,
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#[serde(with = "cross_curve_dleq_scalar")]
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s_a: ::cross_curve_dleq::Scalar,
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#[serde(with = "monero_private_key")]
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s_b: monero::PrivateKey,
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S_a_monero: ::monero::PublicKey,
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S_a_bitcoin: xmr_btc::bitcoin::PublicKey,
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v: xmr_btc::monero::PrivateViewKey,
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#[serde(with = "bitcoin_amount")]
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btc: ::bitcoin::Amount,
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xmr: xmr_btc::monero::Amount,
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refund_timelock: u32,
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refund_address: ::bitcoin::Address,
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transaction: ::bitcoin::Transaction,
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#[serde(with = "ecdsa_fun_signature")]
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tx_punish_sig: xmr_btc::bitcoin::Signature,
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}
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#[tokio::test]
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async fn recover_state_from_db() {
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let db = Database::open(Path::new("../target/test_recover.db")).unwrap();
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let a = xmr_btc::bitcoin::SecretKey::new_random(&mut OsRng);
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let s_a = cross_curve_dleq::Scalar::random(&mut OsRng);
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let s_b = monero::PrivateKey::from_scalar(Scalar::random(&mut OsRng));
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let v_a = xmr_btc::monero::PrivateViewKey::new_random(&mut OsRng);
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let S_a_monero = monero::PublicKey::from_private_key(&monero::PrivateKey {
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scalar: s_a.into_ed25519(),
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});
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let S_a_bitcoin = s_a.into_secp256k1().into();
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let tx_punish_sig = a.sign(SigHash::default());
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let state = TestState {
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A: a.public(),
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a,
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s_b,
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s_a,
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S_a_monero,
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S_a_bitcoin,
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v: v_a,
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btc: ::bitcoin::Amount::from_sat(100),
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xmr: xmr_btc::monero::Amount::from_piconero(1000),
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refund_timelock: 0,
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refund_address: ::bitcoin::Address::from_str("1L5wSMgerhHg8GZGcsNmAx5EXMRXSKR3He")
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.unwrap(),
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transaction: ::bitcoin::Transaction {
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version: 0,
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lock_time: 0,
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input: vec![::bitcoin::TxIn::default()],
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output: vec![::bitcoin::TxOut::default()],
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},
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tx_punish_sig,
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};
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db.insert_latest_state(&state)
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.await
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.expect("Failed to save state the first time");
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let recovered: TestState = db
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.get_latest_state()
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.expect("Failed to recover state the first time");
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// We insert and recover twice to ensure database implementation allows the
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// caller to write to an existing key
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db.insert_latest_state(&recovered)
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.await
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.expect("Failed to save state the second time");
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let recovered: TestState = db
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.get_latest_state()
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.expect("Failed to recover state the second time");
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assert_eq!(state, recovered);
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}
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}
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