fix: resend tx panic (#154)

Closes #151

CHANGELOG.md

@@ -37,6 +37,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## Unreleased
 
+### Bug Fixes
+
+* [#154](https://github.com/babylonlabs-io/vigilante/pull/154) fix: panic in maybeResendSecondTxOfCheckpointToBTC
+
 ## v0.19.0
 
 ### Bug Fixes

config/grpc.go

@@ -1,10 +1,5 @@
 package config
 
-const (
-	// DefaultGRPCAddress defines the default address to bind the gRPC server to.
-	DefaultGRPCAddress = "0.0.0.0:8080"
-)
-
 // GRPCConfig defines configuration for the gRPC server.
 type GRPCConfig struct {
 	OneTimeTLSKey bool     `mapstructure:"onetime-tls-key"`

config/grpcweb.go

@@ -1,10 +1,5 @@
 package config
 
-const (
-	// DefaultGRPCWebAddress defines the default address to bind the gRPC-web server to.
-	DefaultGRPCWebAddress = "0.0.0.0:8081"
-)
-
 // GRPCWebConfig defines configuration for the gRPC-web server.
 type GRPCWebConfig struct {
 	Placeholder string `mapstructure:"placeholder"`

submitter/relayer/relayer.go

@@ -192,16 +192,20 @@ func (rl *Relayer) MaybeResubmitSecondCheckpointTx(ckpt *ckpttypes.RawCheckpoint
 		return nil
 	}
 
-	rl.logger.Debugf("Resending the second tx of the checkpoint %v, old fee of the second tx: %v Satoshis, txid: %s",
+	rl.logger.Debugf("Maybe resending the second tx of the checkpoint %v, old fee of the second tx: %v Satoshis, txid: %s",
 		ckptEpoch, rl.lastSubmittedCheckpoint.Tx2.Fee, rl.lastSubmittedCheckpoint.Tx2.TxID.String())
 
-	resubmittedTx2, err := rl.resendSecondTxOfCheckpointToBTC(rl.lastSubmittedCheckpoint.Tx2, bumpedFee)
+	resubmittedTx2, err := rl.maybeResendSecondTxOfCheckpointToBTC(rl.lastSubmittedCheckpoint.Tx2, bumpedFee)
 	if err != nil {
 		rl.metrics.FailedResentCheckpointsCounter.Inc()
 
 		return fmt.Errorf("failed to re-send the second tx of the checkpoint %v: %w", rl.lastSubmittedCheckpoint.Epoch, err)
 	}
 
+	if resubmittedTx2 == nil {
+		return nil
+	}
+
 	// record the metrics of the resent tx2
 	rl.metrics.NewSubmittedCheckpointSegmentGaugeVec.WithLabelValues(
 		strconv.FormatUint(ckptEpoch, 10),
@@ -255,17 +259,16 @@ func (rl *Relayer) calculateBumpedFee(ckptInfo *types.CheckpointInfo) btcutil.Am
 	return ckptInfo.Tx2.Fee.MulF64(rl.config.ResubmitFeeMultiplier)
 }
 
-// resendSecondTxOfCheckpointToBTC resends the second tx of the checkpoint with bumpedFee
-func (rl *Relayer) resendSecondTxOfCheckpointToBTC(tx2 *types.BtcTxInfo, bumpedFee btcutil.Amount) (*types.BtcTxInfo, error) {
-	_, status, err := rl.TxDetails(rl.lastSubmittedCheckpoint.Tx2.TxID,
-		rl.lastSubmittedCheckpoint.Tx2.Tx.TxOut[changePosition].PkScript)
+// maybeResendSecondTxOfCheckpointToBTC resends the second tx of the checkpoint with bumpedFee
+func (rl *Relayer) maybeResendSecondTxOfCheckpointToBTC(tx2 *types.BtcTxInfo, bumpedFee btcutil.Amount) (*types.BtcTxInfo, error) {
+	_, status, err := rl.TxDetails(tx2.TxID, tx2.Tx.TxOut[changePosition].PkScript)
 	if err != nil {
 		return nil, err
 	}
 
 	// No need to resend, transaction already confirmed
 	if status == btcclient.TxInChain {
-		rl.logger.Debugf("Transaction %v is already confirmed", rl.lastSubmittedCheckpoint.Tx2.TxID)
+		rl.logger.Debugf("Transaction %v is already confirmed", tx2.TxID)
 
 		return nil, nil
 	}