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@astropsy999
astropsy999 authored May 26, 2022
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Expand Up @@ -719,18 +719,18 @@ request.onsuccess = function() {
};
```

## Promise wrapper
## Обгортка промісів

Adding `onsuccess/onerror` to every request is quite a cumbersome task. Sometimes we can make our life easier by using event delegation, e.g. set handlers on the whole transactions, but `async/await` is much more convenient.
Додавання `onsuccess/onerror` до кожного запиту є досить громіздким завданням. Іноді ми можемо полегшити життя, використовуючи делегування подій, напр. встановити обробники для всіх транзакцій, але `async/await` набагато зручніше.

Let's use a thin promise wrapper <https://github.com/jakearchibald/idb> further in this chapter. It creates a global `idb` object with [promisified](info:promisify) IndexedDB methods.
Давайте використаємо тонку обгортку промісів <https://github.com/jakearchibald/idb> далі в цьому розділі. Вона створює глобальний об’єкт `idb` з методами IndexedDB [promisified](info:promisify).

Then, instead of `onsuccess/onerror` we can write like this:
Тоді замість `onsuccess/onerror` ми можемо написати так:

```js
let db = await idb.openDB('store', 1, db => {
if (db.oldVersion == 0) {
// perform the initialization
// виконати ініціалізацію
db.createObjectStore('books', {keyPath: 'id'});
}
});
Expand All @@ -751,33 +751,33 @@ try {

```

So we have all the sweet "plain async code" and "try..catch" stuff.
Тож маємо все солоденьке «простий асинхронний код» та "try..catch".

### Error handling
### Обробка помилок

If we don't catch an error, then it falls through, till the closest outer `try..catch`.
Якщо ми не ловимо помилку, вона провалюється до найближчого зовнішнього `try..catch`.

An uncaught error becomes an "unhandled promise rejection" event on `window` object.
Невиявлена помилка стає подією "необробленого відхилення промісу" на об’єкті `window`.

We can handle such errors like this:
Ми можемо обробляти такі помилки таким чином:

```js
window.addEventListener('unhandledrejection', event => {
let request = event.target; // IndexedDB native request object
let error = event.reason; // Unhandled error object, same as request.error
...report about the error...
let request = event.target; // Власний об’єкт запиту IndexedDB
let error = event.reason; // Необроблений об’єкт помилки, те саме, що request.error
...повідомити про помилку...
});
```

### "Inactive transaction" pitfall
### Підводний камінь «Неактивна транзакція».


As we already know, a transaction auto-commits as soon as the browser is done with the current code and microtasks. So if we put a *macrotask* like `fetch` in the middle of a transaction, then the transaction won't wait for it to finish. It just auto-commits. So the next request in it would fail.
Як ми вже знаємо, транзакція автоматично завершується, як тільки браузер закінчить роботу з поточним кодом і мікрозавданнями. Отже, якщо ми помістимо *макрозавдання* на кшталт `fetch` в середині транзакції, то транзакція не чекатиме завершення. Вона просто автоматично завершається. Отже, наступний запит буде невдалим.


For a promise wrapper and `async/await` the situation is the same.
Для обгортки промісів і `async/await` ситуація однакова.

Here's an example of `fetch` in the middle of the transaction:
Ось приклад `fetch` у середині транзакції:

```js
let transaction = db.transaction("inventory", "readwrite");
Expand All @@ -787,14 +787,14 @@ await inventory.add({ id: 'js', price: 10, created: new Date() });

await fetch(...); // (*)

await inventory.add({ id: 'js', price: 10, created: new Date() }); // Error
await inventory.add({ id: 'js', price: 10, created: new Date() }); // Помилка
```

The next `inventory.add` after `fetch` `(*)` fails with an "inactive transaction" error, because the transaction is already committed and closed at that time.
Наступний `inventory.add` після `fetch` `(*)` не вдається з помилкою "неактивна транзакція", оскільки на той момент транзакція вже завершена та закрита.

The workaround is the same as when working with native IndexedDB: either make a new transaction or just split things apart.
1. Prepare the data and fetch all that's needed first.
2. Then save in the database.
Обхідний шлях такий же, як і під час роботи з рідною IndexedDB: або зробіть нову транзакцію, або просто розділіть речі.
1. Підготуйте дані та спершу отримайте все необхідне.
2. Потім збережіть у базі даних.

### Getting native objects

Expand Down