Implement retry logic for UpdateAttributes

cmd/model/articles.go

@@ -20,8 +20,7 @@ func (db *DB) AddArticle(a *Article) (int64, error) {
 	query := `
     INSERT INTO articles
         (title, description, content, published, rejected, author_id)
-    VALUES
-        (?, ?, ?, ?, ?, ?)
+    VALUES (?, ?, ?, ?, ?, ?)
     `
 
 	result, err := db.Exec(query, a.Title, a.Description, a.Content, a.Published,

cmd/model/db.go

@@ -5,14 +5,19 @@ import (
 	"database/sql"
 	"fmt"
 	"log"
+	"math"
+	"math/rand/v2"
 	"os"
 	"strings"
 	"syscall"
+	"time"
 
 	"github.com/go-sql-driver/mysql"
 	"golang.org/x/term"
 )
 
+var TxMaxRetries = 3
+
 type DB struct {
 	*sql.DB
 }
@@ -92,6 +97,8 @@ func OpenDB(dbName string) (*DB, error) {
 }
 
 func (db *DB) UpdateAttributes(a ...*Attribute) error {
+	for i := 0; i < TxMaxRetries; i++ {
+		err := func() error {
 			tx, err := db.Begin()
 			if err != nil {
 				return fmt.Errorf("error starting transaction: %v", err)
@@ -115,6 +122,17 @@ func (db *DB) UpdateAttributes(a ...*Attribute) error {
 				return fmt.Errorf("error committing transaction: %v", err)
 			}
 			return nil
+		}()
+		if err == nil {
+			return nil
+		}
+		log.Println(err)
+
+		waitTime := time.Duration(math.Pow(2, float64(i))) * time.Second
+		jitter := time.Duration(rand.IntN(1000)) * time.Millisecond
+		time.Sleep(waitTime + jitter)
+	}
+	return fmt.Errorf("error: %v unsuccessful retries for DB operation, aborting", TxMaxRetries)
 }
 
 func (db *DB) CountEntries(table string) (int64, error) {

cmd/model/users.go

@@ -28,8 +28,7 @@ func (db *DB) AddUser(user *User, pass string) error {
 	}
 
 	query := `
-    INSERT INTO users
-        (username, password, first_name, last_name, role)
+    INSERT INTO users (username, password, first_name, last_name, role)
     VALUES (?, ?, ?, ?, ?)
     `
 	if _, err = db.Exec(query, user.UserName, string(hashedPass), user.FirstName, user.LastName, user.Role); err != nil {