RBF fee bumping utilities

mutiny-core/src/error.rs

@@ -282,6 +282,7 @@ impl From<bdk::Error> for MutinyError {
         match e {
             bdk::Error::Signer(_) => Self::WalletSigningFailed,
             bdk::Error::InsufficientFunds { .. } => Self::InsufficientBalance,
+            bdk::Error::TransactionNotFound => Self::NotFound,
             _ => Self::WalletOperationFailed,
         }
     }

mutiny-core/src/nodemanager.rs

@@ -50,6 +50,7 @@ use payjoin::{PjUri, PjUriExt};
 use reqwest::Client;
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
+use std::cmp::max;
 use std::io::Cursor;
 use std::str::FromStr;
 use std::sync::atomic::{AtomicBool, Ordering};
@@ -935,6 +936,22 @@ impl<S: MutinyStorage> NodeManager<S> {
         self.wallet.estimate_sweep_tx_fee(script, fee_rate)
     }
 
+    /// Bumps the given transaction by replacing the given tx with a transaction at
+    /// the new given fee rate in sats/vbyte
+    pub async fn bump_fee(&self, txid: Txid, new_fee_rate: f32) -> Result<Txid, MutinyError> {
+        // check that this is not a funding tx for any channels,
+        // bumping those can cause loss of funds
+        let channels = self.list_channels().await?;
+        if channels
+            .iter()
+            .any(|c| c.outpoint.is_some_and(|t| t.txid == txid))
+        {
+            return Err(MutinyError::ChannelCreationFailed);
+        }
+
+        self.wallet.bump_fee(txid, new_fee_rate).await
+    }
+
     /// Checks if the given address has any transactions.
     /// If it does, it returns the details of the first transaction.
     ///
@@ -1312,19 +1329,19 @@ impl<S: MutinyStorage> NodeManager<S> {
     /// Gets a fee estimate for a very low priority transaction.
     /// Value is in sat/vbyte.
     pub fn estimate_fee_low(&self) -> u32 {
-        self.fee_estimator.get_low_fee_rate() / 250
+        max(self.fee_estimator.get_low_fee_rate() / 250, 1)
     }
 
     /// Gets a fee estimate for an average priority transaction.
     /// Value is in sat/vbyte.
     pub fn estimate_fee_normal(&self) -> u32 {
-        self.fee_estimator.get_normal_fee_rate() / 250
+        max(self.fee_estimator.get_normal_fee_rate() / 250, 1)
     }
 
     /// Gets a fee estimate for an high priority transaction.
     /// Value is in sat/vbyte.
     pub fn estimate_fee_high(&self) -> u32 {
-        self.fee_estimator.get_high_fee_rate() / 250
+        max(self.fee_estimator.get_high_fee_rate() / 250, 1)
     }
 
     /// Creates a new lightning node and adds it to the manager.

mutiny-core/src/onchain.rs

@@ -628,6 +628,27 @@ impl<S: MutinyStorage> OnChainWallet<S> {
 
         psbt.fee_amount().ok_or(MutinyError::WalletOperationFailed)
     }
+
+    /// Bumps the given transaction by replacing the given tx with a transaction at
+    /// the new given fee rate in sats/vbyte
+    pub async fn bump_fee(&self, txid: Txid, new_fee_rate: f32) -> Result<Txid, MutinyError> {
+        let tx = {
+            let mut wallet = self.wallet.try_write()?;
+            // build RBF fee bump tx
+            let mut builder = wallet.build_fee_bump(txid)?;
+            builder.fee_rate(FeeRate::from_sat_per_vb(new_fee_rate));
+            let (mut psbt, _) = builder.finish()?;
+            wallet.sign(&mut psbt, SignOptions::default())?;
+
+            psbt.extract_tx()
+        };
+
+        let txid = tx.txid();
+
+        self.broadcast_transaction(tx).await?;
+        log_debug!(self.logger, "Fee bump Transaction broadcast! TXID: {txid}");
+        Ok(txid)
+    }
 }
 
 fn get_tr_descriptors_for_extended_key(

mutiny-wasm/src/lib.rs

@@ -574,6 +574,15 @@ impl MutinyWallet {
             .estimate_sweep_channel_open_fee(fee_rate)?)
     }
 
+    /// Bumps the given transaction by replacing the given tx with a transaction at
+    /// the new given fee rate in sats/vbyte
+    pub async fn bump_fee(&self, txid: String, fee_rate: f32) -> Result<String, MutinyJsError> {
+        let txid = Txid::from_str(&txid)?;
+        let result = self.inner.node_manager.bump_fee(txid, fee_rate).await?;
+
+        Ok(result.to_string())
+    }
+
     /// Checks if the given address has any transactions.
     /// If it does, it returns the details of the first transaction.
     ///
@@ -625,6 +634,13 @@ impl MutinyWallet {
         Ok(JsValue::from_serde(&self.inner.node_manager.list_utxos()?)?)
     }
 
+    /// Gets a fee estimate for an low priority transaction.
+    /// Value is in sat/vbyte.
+    #[wasm_bindgen]
+    pub fn estimate_fee_low(&self) -> u32 {
+        self.inner.node_manager.estimate_fee_low()
+    }
+
     /// Gets a fee estimate for an average priority transaction.
     /// Value is in sat/vbyte.
     #[wasm_bindgen]