feat: added db transactions abstraction; cleaned up user registration; repos adapted new abstraction: all repos now support transactions, if present in ctx

internal/repository/user.go

@@ -2,30 +2,19 @@ package repository
 
 import (
 	"context"
-	"database/sql"
 	"fmt"
 
 	"github.com/robindittmar/dttmr-api/internal/domain"
 )
 
 type UserRepo struct {
-	db *sql.DB
-}
-
-func NewUserRepo(db *sql.DB) *UserRepo {
-	return &UserRepo{db: db}
+	Repo
 }
 
 func (r *UserRepo) CreateUser(ctx context.Context, email string, name string, passwordHash string) (*domain.User, error) {
-	tx, err := r.db.BeginTx(ctx, nil)
-	if err != nil {
-		return nil, fmt.Errorf("begin transaction: %w", err)
-	}
-	defer tx.Rollback()
-
 	user := &domain.User{Email: email, Name: name}
 
-	err = tx.QueryRowContext(ctx,
+	err := r.conn(ctx).QueryRowContext(ctx,
 		"INSERT INTO users (email, name, password_hash) VALUES ($1, $2, $3) RETURNING id, created_at",
 		email, name, passwordHash,
 	).Scan(&user.ID, &user.CreatedAt)
@@ -33,15 +22,11 @@ func (r *UserRepo) CreateUser(ctx context.Context, email string, name string, pa
 		return nil, fmt.Errorf("failed to insert user: %w", err)
 	}
 
-	if err := tx.Commit(); err != nil {
-		return nil, fmt.Errorf("commit transaction: %w", err)
-	}
-
 	return user, nil
 }
 
 func (r *UserRepo) DeleteUser(ctx context.Context, userID string) error {
-	_, err := r.db.ExecContext(ctx,
+	_, err := r.conn(ctx).ExecContext(ctx,
 		"DELETE FROM users WHERE id = $1",
 		userID,
 	)
@@ -53,7 +38,7 @@ func (r *UserRepo) DeleteUser(ctx context.Context, userID string) error {
 }
 
 func (r *UserRepo) ChangePassword(ctx context.Context, userID string, passwordHash string) error {
-	_, err := r.db.ExecContext(ctx,
+	_, err := r.conn(ctx).ExecContext(ctx,
 		"UPDATE users SET password_hash = $1 WHERE id = $2",
 		passwordHash, userID,
 	)
@@ -67,7 +52,7 @@ func (r *UserRepo) ChangePassword(ctx context.Context, userID string, passwordHa
 func (r *UserRepo) GetUserByEmail(ctx context.Context, email string) (*domain.User, error) {
 	user := &domain.User{}
 
-	err := r.db.QueryRowContext(ctx,
+	err := r.conn(ctx).QueryRowContext(ctx,
 		"SELECT id, email, name FROM users WHERE email = $1",
 		email,
 	).Scan(&user.ID, &user.Email, &user.Name)