Handle rollbackError with log.Fatalf()

cmd/data/db.go

@@ -3,6 +3,7 @@ package data
 import (
 	"database/sql"
 	"fmt"
+	"log"
 
 	"github.com/go-sql-driver/mysql"
 	"golang.org/x/crypto/bcrypt"
@@ -102,18 +103,24 @@ func (db *DB) ChangePassword(id int64, oldPass, newPass string) error {
     `
 	row := tx.QueryRow(getQuery, id)
 	if err := row.Scan(&queriedPass); err != nil {
-		tx.Rollback()
+		if rollbackErr := tx.Rollback(); rollbackErr != nil {
+			log.Fatalf("error: transaction error: %v, rollback error: %v", err, rollbackErr)
+		}
 		return fmt.Errorf("error reading password from DB: %v", err)
 	}
 
 	if err := bcrypt.CompareHashAndPassword([]byte(queriedPass), []byte(oldPass)); err != nil {
-		tx.Rollback()
+		if rollbackErr := tx.Rollback(); rollbackErr != nil {
+			log.Fatalf("error: transaction error: %v, rollback error: %v", err, rollbackErr)
+		}
 		return fmt.Errorf("incorrect password: %v", err)
 	}
 
 	newHashedPass, err := bcrypt.GenerateFromPassword([]byte(newPass), bcrypt.DefaultCost)
 	if err != nil {
-		tx.Rollback()
+		if rollbackErr := tx.Rollback(); rollbackErr != nil {
+			log.Fatalf("error: transaction error: %v, rollback error: %v", err, rollbackErr)
+		}
 		return fmt.Errorf("error creating password hash: %v", err)
 	}
 
@@ -123,7 +130,9 @@ func (db *DB) ChangePassword(id int64, oldPass, newPass string) error {
     WHERE id = ?
     `
 	if _, err = tx.Exec(setQuery, string(newHashedPass), id); err != nil {
-		tx.Rollback()
+		if rollbackErr := tx.Rollback(); rollbackErr != nil {
+			log.Fatalf("error: transaction error: %v, rollback error: %v", err, rollbackErr)
+		}
 		return fmt.Errorf("error updating password in DB: %v", err)
 	}