ASB config may specify finality confirmations

By default the finality confirmations of the network's `env::Config` will be applied and no finality confirmations will be persisted on disk in the config file.
It is however possible to set finality confirmations in the config file for bitcoin and monero for power users at their own risk.
If set the defaults will be overwritten with the parameter from the config file upon startup.

swap/src/asb/config.rs

@@ -293,10 +293,12 @@ pub fn query_user_for_initial_config(testnet: bool) -> Result<Config> {
         bitcoin: Bitcoin {
             electrum_rpc_url,
             target_block,
+            finality_confirmations: None,
             network: bitcoin_network,
         },
         monero: Monero {
             wallet_rpc_url: monero_wallet_rpc_url,
+            finality_confirmations: None,
             network: monero_network,
         },
         tor: TorConf {
@@ -330,6 +332,7 @@ mod tests {
             bitcoin: Bitcoin {
                 electrum_rpc_url: defaults.electrum_rpc_url,
                 target_block: defaults.bitcoin_confirmation_target,
+                finality_confirmations: None,
                 network: bitcoin::Network::Testnet,
             },
             network: Network {
@@ -338,6 +341,7 @@ mod tests {
 
             monero: Monero {
                 wallet_rpc_url: defaults.monero_wallet_rpc_url,
+                finality_confirmations: None,
                 network: monero::Network::Stagenet,
             },
             tor: Default::default(),
@@ -368,6 +372,7 @@ mod tests {
             bitcoin: Bitcoin {
                 electrum_rpc_url: defaults.electrum_rpc_url,
                 target_block: defaults.bitcoin_confirmation_target,
+                finality_confirmations: None,
                 network: bitcoin::Network::Bitcoin,
             },
             network: Network {
@@ -376,6 +381,7 @@ mod tests {
 
             monero: Monero {
                 wallet_rpc_url: defaults.monero_wallet_rpc_url,
+                finality_confirmations: None,
                 network: monero::Network::Mainnet,
             },
             tor: Default::default(),

swap/src/bin/asb.rs

@@ -26,7 +26,6 @@ use swap::asb::config::{
     GetDefaults,
 };
 use swap::database::Database;
-use swap::env::GetConfig;
 use swap::monero::Amount;
 use swap::network::swarm;
 use swap::protocol::alice;
@@ -69,11 +68,7 @@ async fn main() -> Result<()> {
         }
     };
 
-    let env_config = if testnet {
-        env::Testnet::get_config()
-    } else {
-        env::Mainnet::get_config()
-    };
+    let env_config = env::new(testnet, &config);
 
     if config.monero.network != env_config.monero_network {
         bail!(format!(

swap/src/env.rs

@@ -1,3 +1,4 @@
+use crate::asb;
 use crate::bitcoin::{CancelTimelock, PunishTimelock};
 use std::cmp::max;
 use std::time::Duration;
@@ -91,6 +92,33 @@ fn sync_interval(avg_block_time: Duration) -> Duration {
     max(avg_block_time / 10, Duration::from_secs(1))
 }
 
+pub fn new(is_testnet: bool, asb_config: &asb::config::Config) -> Config {
+    let env_config = if is_testnet {
+        Testnet::get_config()
+    } else {
+        Mainnet::get_config()
+    };
+
+    let env_config =
+        if let Some(bitcoin_finality_confirmations) = asb_config.bitcoin.finality_confirmations {
+            Config {
+                bitcoin_finality_confirmations,
+                ..env_config
+            }
+        } else {
+            env_config
+        };
+
+    if let Some(monero_finality_confirmations) = asb_config.monero.finality_confirmations {
+        Config {
+            monero_finality_confirmations,
+            ..env_config
+        }
+    } else {
+        env_config
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;