2020-10-13 22:32:25 +00:00
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use anyhow::{anyhow, Context, Result};
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2020-11-02 05:00:10 +00:00
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use serde::{de::DeserializeOwned, Deserialize, Serialize};
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2020-10-13 22:32:25 +00:00
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use std::path::Path;
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2020-11-03 03:23:03 +00:00
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use uuid::Uuid;
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2020-11-02 06:14:56 +00:00
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use xmr_btc::{alice, bob, monero, serde::monero_private_key};
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2020-11-02 05:00:10 +00:00
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#[allow(clippy::large_enum_variant)]
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2020-11-03 04:26:47 +00:00
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#[derive(Clone, Debug, Deserialize, Serialize, PartialEq)]
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pub enum Swap {
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Alice(Alice),
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Bob(Bob),
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}
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#[allow(clippy::large_enum_variant)]
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#[derive(Clone, Debug, Deserialize, Serialize, PartialEq)]
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2020-11-02 05:00:10 +00:00
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pub enum Alice {
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Handshaken(alice::State3),
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BtcLocked(alice::State3),
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XmrLocked(alice::State3),
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2020-11-02 06:14:56 +00:00
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BtcRedeemable {
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state: alice::State3,
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2020-11-02 06:14:56 +00:00
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redeem_tx: bitcoin::Transaction,
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2020-11-02 05:00:10 +00:00
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},
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2020-11-02 06:14:56 +00:00
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BtcPunishable(alice::State3),
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2020-11-02 05:00:10 +00:00
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BtcRefunded {
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state: alice::State3,
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#[serde(with = "monero_private_key")]
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2020-11-02 06:14:56 +00:00
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spend_key: monero::PrivateKey,
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view_key: monero::PrivateViewKey,
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2020-11-02 05:00:10 +00:00
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},
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SwapComplete,
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}
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2020-10-13 22:32:25 +00:00
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2020-11-03 04:26:47 +00:00
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#[derive(Clone, Debug, Deserialize, Serialize, PartialEq)]
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2020-11-02 06:14:56 +00:00
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pub enum Bob {
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Handshaken(bob::State2),
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BtcLocked(bob::State2),
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XmrLocked(bob::State2),
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BtcRedeemed(bob::State2),
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BtcRefundable(bob::State2),
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SwapComplete,
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}
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2020-11-03 04:26:47 +00:00
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impl From<Alice> for Swap {
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fn from(from: Alice) -> Self {
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Swap::Alice(from)
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}
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2020-10-13 22:32:25 +00:00
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}
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2020-11-03 04:26:47 +00:00
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impl From<Bob> for Swap {
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fn from(from: Bob) -> Self {
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Swap::Bob(from)
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}
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}
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pub struct Database(sled::Db);
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impl Database {
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2020-10-13 22:32:25 +00:00
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pub fn open(path: &Path) -> Result<Self> {
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2020-10-21 22:52:57 +00:00
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let db =
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sled::open(path).with_context(|| format!("Could not open the DB at {:?}", path))?;
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2020-10-13 22:32:25 +00:00
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2020-11-03 04:26:47 +00:00
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Ok(Database(db))
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2020-10-13 22:32:25 +00:00
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}
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2020-11-02 06:14:56 +00:00
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// TODO: Add method to update state
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2020-11-03 04:26:47 +00:00
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pub async fn insert_latest_state(&self, swap_id: Uuid, state: Swap) -> Result<()> {
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2020-11-03 03:23:03 +00:00
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let key = serialize(&swap_id)?;
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2020-10-13 22:32:25 +00:00
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let new_value = serialize(&state).context("Could not serialize new state value")?;
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2020-11-03 04:26:47 +00:00
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let old_value = self.0.get(&key)?;
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2020-10-13 22:32:25 +00:00
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2020-11-03 04:26:47 +00:00
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self.0
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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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2020-10-21 22:52:57 +00:00
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.context("Stored swap somehow changed, aborting saving")?;
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2020-10-13 22:32:25 +00:00
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2020-10-22 08:27:22 +00:00
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// TODO: see if this can be done through sled config
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2020-11-03 04:26:47 +00:00
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self.0
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2020-10-13 22:32:25 +00:00
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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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2020-11-03 04:26:47 +00:00
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pub fn get_latest_state(&self, swap_id: Uuid) -> anyhow::Result<Swap> {
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2020-11-03 03:23:03 +00:00
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let key = serialize(&swap_id)?;
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2020-10-13 22:32:25 +00:00
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let encoded = self
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.0
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2020-10-13 22:32:25 +00:00
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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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use super::*;
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2020-11-03 04:26:47 +00:00
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#[tokio::test]
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async fn can_write_and_read_to_multiple_keys() {
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let db_dir = tempfile::tempdir().unwrap();
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let db = Database::open(db_dir.path()).unwrap();
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let state_1 = Swap::Alice(Alice::SwapComplete);
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let swap_id_1 = Uuid::new_v4();
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db.insert_latest_state(swap_id_1, state_1.clone())
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.await
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.expect("Failed to save second state");
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let state_2 = Swap::Bob(Bob::SwapComplete);
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let swap_id_2 = Uuid::new_v4();
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db.insert_latest_state(swap_id_2, state_2.clone())
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.await
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.expect("Failed to save first state");
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let recovered_1 = db
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.get_latest_state(swap_id_1)
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.expect("Failed to recover first state");
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let recovered_2 = db
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.get_latest_state(swap_id_2)
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.expect("Failed to recover second state");
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assert_eq!(recovered_1, state_1);
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assert_eq!(recovered_2, state_2);
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2020-10-13 22:32:25 +00:00
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}
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#[tokio::test]
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2020-11-03 04:26:47 +00:00
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async fn can_write_twice_to_one_key() {
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2020-10-22 08:34:53 +00:00
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let db_dir = tempfile::tempdir().unwrap();
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let db = Database::open(db_dir.path()).unwrap();
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2020-10-13 22:32:25 +00:00
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2020-11-03 04:26:47 +00:00
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let state = Swap::Alice(Alice::SwapComplete);
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2020-10-13 22:32:25 +00:00
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2020-11-03 03:23:03 +00:00
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let swap_id = Uuid::new_v4();
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2020-11-03 04:26:47 +00:00
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db.insert_latest_state(swap_id, state.clone())
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2020-10-13 22:32:25 +00:00
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.await
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.expect("Failed to save state the first time");
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2020-11-03 04:26:47 +00:00
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let recovered = db
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2020-11-03 03:23:03 +00:00
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.get_latest_state(swap_id)
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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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2020-11-03 04:26:47 +00:00
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db.insert_latest_state(swap_id, recovered)
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2020-10-13 22:32:25 +00:00
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.await
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.expect("Failed to save state the second time");
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2020-11-03 04:26:47 +00:00
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let recovered = db
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2020-11-03 03:23:03 +00:00
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.get_latest_state(swap_id)
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2020-10-13 22:32:25 +00:00
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.expect("Failed to recover state the second time");
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2020-11-03 04:26:47 +00:00
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assert_eq!(recovered, state);
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2020-10-13 22:32:25 +00:00
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}
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}
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