sweepbatcher: remove unneeded for loops

The loop always had exactly one iteration.

sweepbatcher/sweep_batch.go

@@ -1822,29 +1822,22 @@ func (b *batch) monitorSpend(ctx context.Context, primarySweep sweep) error {
 		b.Infof("monitoring spend for outpoint %s",
 			primarySweep.outpoint.String())
 
-		for {
+		select {
+		case spend := <-spendChan:
 			select {
-			case spend := <-spendChan:
-				select {
-				case b.spendChan <- spend:
-
-				case <-ctx.Done():
-				}
-
-				return
-
-			case err := <-spendErr:
-				b.writeToSpendErrChan(ctx, err)
-
-				b.writeToErrChan(
-					fmt.Errorf("spend error: %w", err),
-				)
-
-				return
+			case b.spendChan <- spend:
 
 			case <-ctx.Done():
-				return
 			}
+
+		case err := <-spendErr:
+			b.writeToSpendErrChan(ctx, err)
+
+			b.writeToErrChan(
+				fmt.Errorf("spend error: %w", err),
+			)
+
+		case <-ctx.Done():
 		}
 	}()
 
@@ -1878,39 +1871,31 @@ func (b *batch) monitorConfirmations(ctx context.Context) error {
 		defer cancel()
 		defer b.wg.Done()
 
-		for {
+		select {
+		case conf := <-confChan:
 			select {
-			case conf := <-confChan:
-				select {
-				case b.confChan <- conf:
-
-				case <-ctx.Done():
-				}
-
-				return
-
-			case err := <-errChan:
-				b.writeToErrChan(fmt.Errorf("confirmations "+
-					"monitoring error: %w", err))
-
-				return
-
-			case <-reorgChan:
-				// A re-org has been detected. We set the batch
-				// state back to open since our batch
-				// transaction is no longer present in any
-				// block. We can accept more sweeps and try to
-				// publish new transactions, at this point we
-				// need to monitor again for a new spend.
-				select {
-				case b.reorgChan <- struct{}{}:
-				case <-ctx.Done():
-				}
-				return
+			case b.confChan <- conf:
 
 			case <-ctx.Done():
-				return
 			}
+
+		case err := <-errChan:
+			b.writeToErrChan(fmt.Errorf("confirmations "+
+				"monitoring error: %w", err))
+
+		case <-reorgChan:
+			// A re-org has been detected. We set the batch
+			// state back to open since our batch
+			// transaction is no longer present in any
+			// block. We can accept more sweeps and try to
+			// publish new transactions, at this point we
+			// need to monitor again for a new spend.
+			select {
+			case b.reorgChan <- struct{}{}:
+			case <-ctx.Done():
+			}
+
+		case <-ctx.Done():
 		}
 	}()
 

sweepbatcher/sweep_batcher.go

@@ -1154,74 +1154,70 @@ func (b *Batcher) monitorSpendAndNotify(ctx context.Context, sweep *sweep,
 		infof("Batcher monitoring spend for swap %x",
 			sweep.swapHash[:6])
 
-		for {
+		select {
+		case spend := <-spendChan:
+			spendTx := spend.SpendingTx
+			// Calculate the fee portion that each sweep should pay
+			// for the batch.
+			feePortionPerSweep, roundingDifference :=
+				getFeePortionForSweep(
+					spendTx, len(spendTx.TxIn),
+					totalSwept,
+				)
+
+			onChainFeePortion := getFeePortionPaidBySweep(
+				spendTx, feePortionPerSweep,
+				roundingDifference, sweep,
+			)
+
+			// Notify the requester of the spend with the spend
+			// details, including the fee portion for this
+			// particular sweep.
+			spendDetail := &SpendDetail{
+				Tx:                spendTx,
+				OnChainFeePortion: onChainFeePortion,
+			}
+
 			select {
-			case spend := <-spendChan:
-				spendTx := spend.SpendingTx
-				// Calculate the fee portion that each sweep
-				// should pay for the batch.
-				feePortionPerSweep, roundingDifference :=
-					getFeePortionForSweep(
-						spendTx, len(spendTx.TxIn),
-						totalSwept,
-					)
-
-				onChainFeePortion := getFeePortionPaidBySweep(
-					spendTx, feePortionPerSweep,
-					roundingDifference, sweep,
-				)
-
-				// Notify the requester of the spend
-				// with the spend details, including the fee
-				// portion for this particular sweep.
-				spendDetail := &SpendDetail{
-					Tx:                spendTx,
-					OnChainFeePortion: onChainFeePortion,
-				}
-
-				select {
-				// Try to write the update to the notification
-				// channel.
-				case notifier.SpendChan <- spendDetail:
-
-				// If a quit signal was provided by the swap,
-				// continue.
-				case <-notifier.QuitChan:
-
-				// If the context was canceled, stop.
-				case <-ctx.Done():
-				}
-
-				return
-
-			case err := <-spendErr:
-				select {
-				// Try to write the error to the notification
-				// channel.
-				case notifier.SpendErrChan <- err:
-
-				// If a quit signal was provided by the swap,
-				// continue.
-				case <-notifier.QuitChan:
-
-				// If the context was canceled, stop.
-				case <-ctx.Done():
-				}
-
-				b.writeToErrChan(
-					ctx, fmt.Errorf("spend error: %w", err),
-				)
-
-				return
+			// Try to write the update to the notification channel.
+			case notifier.SpendChan <- spendDetail:
 
 			// If a quit signal was provided by the swap, continue.
 			case <-notifier.QuitChan:
-				return
 
 			// If the context was canceled, stop.
 			case <-ctx.Done():
-				return
 			}
+
+			return
+
+		case err := <-spendErr:
+			select {
+			// Try to write the error to the notification
+			// channel.
+			case notifier.SpendErrChan <- err:
+
+			// If a quit signal was provided by the swap,
+			// continue.
+			case <-notifier.QuitChan:
+
+			// If the context was canceled, stop.
+			case <-ctx.Done():
+			}
+
+			b.writeToErrChan(
+				ctx, fmt.Errorf("spend error: %w", err),
+			)
+
+			return
+
+		// If a quit signal was provided by the swap, continue.
+		case <-notifier.QuitChan:
+			return
+
+		// If the context was canceled, stop.
+		case <-ctx.Done():
+			return
 		}
 	}()