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Save state for Alice at specific points in the swap

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This commit is contained in:
Lucas Soriano del Pino 2020-11-02 17:14:56 +11:00 committed by rishflab
parent ea08778b2f
commit 934ddb366a
3 changed files with 57 additions and 35 deletions
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38
swap/src/alice.rs
View File

@ -31,7 +31,7 @@ use crate::{
transport::SwapTransport,
TokioExecutor,
},
storage::Database,
storage::{self, Database},
SwapAmounts, PUNISH_TIMELOCK, REFUND_TIMELOCK,
};
use xmr_btc::{
@ -44,7 +44,7 @@ use xmr_btc::{
pub async fn swap(
bitcoin_wallet: Arc<bitcoin::Wallet>,
monero_wallet: Arc<monero::Wallet>,
_db: Database<crate::storage::Alice>,
db: Database<storage::Alice>,
listen: Multiaddr,
transport: SwapTransport,
behaviour: Alice,
@ -175,6 +175,9 @@ pub async fn swap(
other => panic!("Unexpected event: {:?}", other),
};
db.insert_latest_state(&storage::Alice::Handshaken(state3.clone()))
.await?;
info!("Handshake complete, we now have State3 for Alice.");
let network = Arc::new(Mutex::new(Network {
@ -185,7 +188,7 @@ pub async fn swap(
let mut action_generator = action_generator(
network.clone(),
bitcoin_wallet.clone(),
state3,
state3.clone(),
TX_LOCK_MINE_TIMEOUT,
);
@ -200,33 +203,60 @@ pub async fn swap(
public_spend_key,
public_view_key,
}) => {
db.insert_latest_state(&storage::Alice::BtcLocked(state3.clone()))
.await?;
let (transfer_proof, _) = monero_wallet
.transfer(public_spend_key, public_view_key, amount)
.await?;
db.insert_latest_state(&storage::Alice::XmrLocked(state3.clone()))
.await?;
let mut guard = network.as_ref().lock().await;
guard.send_message2(transfer_proof).await;
info!("Sent transfer proof");
}
GeneratorState::Yielded(Action::RedeemBtc(tx)) => {
db.insert_latest_state(&storage::Alice::BtcRedeemable {
state: state3.clone(),
redeem_tx: tx.clone(),
})
.await?;
let _ = bitcoin_wallet.broadcast_signed_transaction(tx).await?;
}
GeneratorState::Yielded(Action::CancelBtc(tx)) => {
let _ = bitcoin_wallet.broadcast_signed_transaction(tx).await?;
}
GeneratorState::Yielded(Action::PunishBtc(tx)) => {
db.insert_latest_state(&storage::Alice::BtcPunishable(state3.clone()))
.await?;
let _ = bitcoin_wallet.broadcast_signed_transaction(tx).await?;
}
GeneratorState::Yielded(Action::CreateMoneroWalletForOutput {
spend_key,
view_key,
}) => {
db.insert_latest_state(&storage::Alice::BtcRefunded {
state: state3.clone(),
spend_key,
view_key,
})
.await?;
monero_wallet
.create_and_load_wallet_for_output(spend_key, view_key)
.await?;
}
GeneratorState::Complete(()) => return Ok(()),
GeneratorState::Complete(()) => {
db.insert_latest_state(&storage::Alice::SwapComplete)
.await?;
return Ok(());
}
}
}
}

11
swap/src/bob.rs
View File

@ -174,10 +174,6 @@ pub async fn swap(
.await?;
}
GeneratorState::Yielded(bob::Action::SendBtcRedeemEncsig(tx_redeem_encsig)) => {
// FIXME: We _know_ that this action is only yielded if the monero has been
// locked. This only works because we know that this is the case, but it may be
// cleaner to save the state inside an implementation of `watch_for_transfer` or
// modify the library code to make this easier
db.insert_latest_state(&storage::Bob::XmrLocked(state2.clone()))
.await?;
@ -198,10 +194,6 @@ pub async fn swap(
spend_key,
view_key,
}) => {
// FIXME: We _know_ that this action is only yielded if the bitcoin has been
// redeemed. This only works because we know that this is the case, but it may
// be cleaner to save the state inside an implementation of `watch_for_transfer`
// or modify the library code to make this easier
db.insert_latest_state(&storage::Bob::BtcRedeemed(state2.clone()))
.await?;
@ -216,9 +208,6 @@ pub async fn swap(
let _ = bitcoin_wallet
.broadcast_signed_transaction(tx_cancel)
.await?;
db.insert_latest_state(&storage::Bob::BtcRefundable(state2.clone()))
.await?;
}
GeneratorState::Yielded(bob::Action::RefundBtc(tx_refund)) => {
db.insert_latest_state(&storage::Bob::BtcRefundable(state2.clone()))

43
swap/src/storage.rs
View File

@ -1,7 +1,27 @@
use anyhow::{anyhow, Context, Result};
use serde::{de::DeserializeOwned, Deserialize, Serialize};
use std::path::Path;
use xmr_btc::{alice, bitcoin::EncryptedSignature, bob, serde::monero_private_key};
use xmr_btc::{alice, bob, monero, serde::monero_private_key};
#[allow(clippy::large_enum_variant)]
#[derive(Clone, Debug, Deserialize, Serialize)]
pub enum Alice {
Handshaken(alice::State3),
BtcLocked(alice::State3),
XmrLocked(alice::State3),
BtcRedeemable {
state: alice::State3,
redeem_tx: bitcoin::Transaction,
},
BtcPunishable(alice::State3),
BtcRefunded {
state: alice::State3,
#[serde(with = "monero_private_key")]
spend_key: monero::PrivateKey,
view_key: monero::PrivateViewKey,
},
SwapComplete,
}
#[derive(Clone, Debug, Deserialize, Serialize)]
pub enum Bob {
@ -13,25 +33,6 @@ pub enum Bob {
SwapComplete,
}
#[allow(clippy::large_enum_variant)]
#[derive(Clone, Debug, Deserialize, Serialize)]
pub enum Alice {
Handshaken(alice::State3),
BtcLocked(alice::State3),
XmrLocked(alice::State3),
ReceivedEncSig {
state: alice::State3,
enc_sig: EncryptedSignature,
},
BtcCancelled(alice::State3),
BtcRefunded {
state: alice::State3,
#[serde(with = "monero_private_key")]
s_b: monero::PrivateKey,
},
SwapComplete,
}
pub struct Database<T>
where
T: Serialize + DeserializeOwned,
@ -57,6 +58,8 @@ where
})
}
// TODO: Add method to update state
pub async fn insert_latest_state(&self, state: &T) -> Result<()> {
let key = serialize(&Self::LAST_STATE_KEY)?;
let new_value = serialize(&state).context("Could not serialize new state value")?;