feat: add config for swap parameters such as finality arguments

farcasterd.toml

@@ -37,6 +37,23 @@ bitcoin_cookie_path = "~/.bitcoin/testnet3/.cookie"
 # the wallet should have spendable funds
 monero_rpc_wallet = "http://localhost:38084"
 
+# Swap parameter for the Bitcoin blockchain
+[swap.bitcoin]
+# Avoid broadcasting a transaction if a race can happen in # blocks
+#
+# E.g. if the safety margin is set to 3 and the the cancel transaction becomes
+# broadcastable in 4 blocks we are safe and we do publish buy, if it becomes
+# broadcastable in 3 blocks or less we do not publish the buy as the safety
+# margin is not respected.
+safety_margin = 3
+# Number of confirmations required to consider a transaction final
+finality = 1
+
+# Swap parameter for the Monero blockchain
+[swap.monero]
+# Number of confirmations required to consider a transaction final
+finality = 5
+
 # Defines grpc options
 [grpc]
 # Set this to true to enable the grpc daemon

src/config.rs

@@ -40,6 +40,8 @@ pub const GRPC_BIND_IP_ADDRESS: &str = "127.0.0.1";
 pub struct Config {
     /// Farcasterd configuration
     pub farcasterd: Option<FarcasterdConfig>,
+    /// Swap configuration, applies to all swaps launched by this node
+    pub swap: Option<SwapConfig>,
     /// Sets the grpc server port, if none is given, no grpc server is run
     pub grpc: Option<GrpcConfig>,
     /// Syncer configuration
@@ -142,6 +144,7 @@ impl Default for Config {
     fn default() -> Self {
         Config {
             farcasterd: Some(FarcasterdConfig::default()),
+            swap: None,
             grpc: None,
             syncers: Some(SyncersConfig::default()),
         }
@@ -161,6 +164,31 @@ pub struct FarcasterdConfig {
     pub auto_restore: Option<bool>,
 }
 
+#[derive(Deserialize, Serialize, Debug, Clone, Default)]
+#[serde(crate = "serde_crate")]
+pub struct SwapConfig {
+    /// Swap parameters for the Bitcoin blockchain
+    pub bitcoin: BitcoinConfig,
+    /// Swap parameters for the Monero blockchain
+    pub monero: MoneroConfig,
+}
+
+#[derive(Deserialize, Serialize, Debug, Clone, Default)]
+#[serde(crate = "serde_crate")]
+pub struct BitcoinConfig {
+    /// Avoid broadcasting a transaction if a race can happen in # blocks
+    pub safety_margin: u8,
+    /// Number of confirmations required to consider a transaction final
+    pub finality: u8,
+}
+
+#[derive(Deserialize, Serialize, Debug, Clone, Default)]
+#[serde(crate = "serde_crate")]
+pub struct MoneroConfig {
+    /// Number of confirmations required to consider a transaction final
+    pub finality: u8,
+}
+
 #[derive(Deserialize, Serialize, Debug, Clone)]
 #[serde(crate = "serde_crate")]
 pub struct GrpcConfig {

src/swapd/runtime.rs

@@ -87,7 +87,6 @@ pub fn run(
         SwapRole::Alice => State::Alice(AliceState::StartA { local_trade_role }),
         SwapRole::Bob => State::Bob(BobState::StartB { local_trade_role }),
     };
-    let sweep_monero_thr = 10;
     info!(
         "{}: {}",
         "Starting swap".to_string().bright_green_bold(),
@@ -105,7 +104,8 @@ pub fn run(
         btc_finality_thr: 1,
         race_thr: 3,
         xmr_finality_thr: 1,
-        sweep_monero_thr,
+        // this is a constant
+        sweep_monero_thr: 10,
     };
 
     temporal_safety.valid_params()?;