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/*
* Copyright (C) 2019-2020 Yomichan Authors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
class StorageController {
constructor() {
this._mostRecentStorageEstimate = null;
this._storageEstimateFailed = false;
this._isUpdating = false;
}
prepare() {
this._preparePersistentStorage();
this.updateStats();
document.querySelector('#storage-refresh').addEventListener('click', this.updateStats.bind(this), false);
}
async updateStats() {
try {
this._isUpdating = true;
const estimate = await this._storageEstimate();
const valid = (estimate !== null);
if (valid) {
// Firefox reports usage as 0 when persistent storage is enabled.
const finite = (estimate.usage > 0 || !(await this._isStoragePeristent()));
if (finite) {
document.querySelector('#storage-usage').textContent = this._bytesToLabeledString(estimate.usage);
document.querySelector('#storage-quota').textContent = this._bytesToLabeledString(estimate.quota);
}
document.querySelector('#storage-use-finite').classList.toggle('storage-hidden', !finite);
document.querySelector('#storage-use-infinite').classList.toggle('storage-hidden', finite);
}
document.querySelector('#storage-use').classList.toggle('storage-hidden', !valid);
document.querySelector('#storage-error').classList.toggle('storage-hidden', valid);
return valid;
} finally {
this._isUpdating = false;
}
}
// Private
async _preparePersistentStorage() {
if (!(navigator.storage && navigator.storage.persist)) {
// Not supported
return;
}
const info = document.querySelector('#storage-persist-info');
const button = document.querySelector('#storage-persist-button');
const checkbox = document.querySelector('#storage-persist-button-checkbox');
info.classList.remove('storage-hidden');
button.classList.remove('storage-hidden');
let persisted = await this._isStoragePeristent();
checkbox.checked = persisted;
button.addEventListener('click', async () => {
if (persisted) {
return;
}
let result = false;
try {
result = await navigator.storage.persist();
} catch (e) {
// NOP
}
if (result) {
persisted = true;
checkbox.checked = true;
this.updateStats();
} else {
document.querySelector('.storage-persist-fail-warning').classList.remove('storage-hidden');
}
}, false);
}
async _storageEstimate() {
if (this._storageEstimateFailed && this._mostRecentStorageEstimate === null) {
return null;
}
try {
const value = await navigator.storage.estimate();
this._mostRecentStorageEstimate = value;
return value;
} catch (e) {
this._storageEstimateFailed = true;
}
return null;
}
_bytesToLabeledString(size) {
const base = 1000;
const labels = [' bytes', 'KB', 'MB', 'GB'];
let labelIndex = 0;
while (size >= base) {
size /= base;
++labelIndex;
}
const label = labelIndex === 0 ? `${size}` : size.toFixed(1);
return `${label}${labels[labelIndex]}`;
}
async _isStoragePeristent() {
try {
return await navigator.storage.persisted();
} catch (e) {
// NOP
}
return false;
}
}
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