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swap_setup instead of spot_price and execution_setup

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Having `spot_price` and `execution_setup` as separate protocols did not bring any advantages, but was problematic because we had to ensure that `execution_setup` would be triggered after `spot_price`. Because of this dependency it is better to combine the protocols into one.

Combining the protocols also allows a refactoring to get rid of the `libp2p-async-await` dependency.

Alice always listens for the `swap_setup` protocol. When Bob opens a substream on that protocol the spot price is communicated, and then all execution setup messages (swap-id and signature exchange).
This commit is contained in:
Daniel Karzel 2021-06-24 13:54:26 +10:00
parent ada5acb2b5
commit 818147a629
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GPG key ID: 30C3FC2E438ADB6E
30 changed files with 1063 additions and 1563 deletions
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59
swap/src/protocol/bob/swap.rs
View file

@ -1,12 +1,11 @@
use crate::bitcoin::{ExpiredTimelocks, TxCancel, TxRefund};
use crate::database::Swap;
use crate::env::Config;
use crate::protocol::bob;
use crate::protocol::bob::event_loop::EventLoopHandle;
use crate::protocol::bob::state::*;
use crate::protocol::bob::swap_setup::NewSwap;
use crate::{bitcoin, monero};
use anyhow::{bail, Context, Result};
use rand::rngs::OsRng;
use tokio::select;
use uuid::Uuid;
@ -38,7 +37,6 @@ pub async fn run_until(
&mut swap.event_loop_handle,
swap.bitcoin_wallet.as_ref(),
swap.monero_wallet.as_ref(),
&swap.env_config,
swap.receive_monero_address,
)
.await?;
@ -58,7 +56,6 @@ async fn next_state(
event_loop_handle: &mut EventLoopHandle,
bitcoin_wallet: &bitcoin::Wallet,
monero_wallet: &monero::Wallet,
env_config: &Config,
receive_monero_address: monero::Address,
) -> Result<BobState> {
tracing::trace!(%state, "Advancing state");
@ -73,20 +70,19 @@ async fn next_state(
.estimate_fee(TxCancel::weight(), btc_amount)
.await?;
let state2 = request_price_and_setup(
swap_id,
btc_amount,
event_loop_handle,
env_config,
bitcoin_refund_address,
tx_refund_fee,
tx_cancel_fee,
)
.await?;
let state2 = event_loop_handle
.setup_swap(NewSwap {
swap_id,
btc: btc_amount,
tx_refund_fee,
tx_cancel_fee,
bitcoin_refund_address,
})
.await?;
BobState::ExecutionSetupDone(state2)
BobState::SwapSetupCompleted(state2)
}
BobState::ExecutionSetupDone(state2) => {
BobState::SwapSetupCompleted(state2) => {
// Alice and Bob have exchanged info
let (state3, tx_lock) = state2.lock_btc().await?;
let signed_tx = bitcoin_wallet
@ -268,34 +264,3 @@ async fn next_state(
BobState::XmrRedeemed { tx_lock_id } => BobState::XmrRedeemed { tx_lock_id },
})
}
pub async fn request_price_and_setup(
swap_id: Uuid,
btc: bitcoin::Amount,
event_loop_handle: &mut EventLoopHandle,
env_config: &Config,
bitcoin_refund_address: bitcoin::Address,
tx_refund_fee: bitcoin::Amount,
tx_cancel_fee: bitcoin::Amount,
) -> Result<bob::state::State2> {
let xmr = event_loop_handle.request_spot_price(btc).await?;
tracing::info!(%btc, %xmr, "Spot price");
let state0 = State0::new(
swap_id,
&mut OsRng,
btc,
xmr,
env_config.bitcoin_cancel_timelock,
env_config.bitcoin_punish_timelock,
bitcoin_refund_address,
env_config.monero_finality_confirmations,
tx_refund_fee,
tx_cancel_fee,
);
let state2 = event_loop_handle.execution_setup(state0).await?;
Ok(state2)
}