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/*
* Copyright (C) 2019-2022 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(persistentStorageController) {
this._persistentStorageController = persistentStorageController;
this._mostRecentStorageEstimate = null;
this._storageEstimateFailed = false;
this._isUpdating = false;
this._storageUsageNode = null;
this._storageQuotaNode = null;
this._storageUseFiniteNodes = null;
this._storageUseInfiniteNodes = null;
this._storageUseValidNodes = null;
this._storageUseInvalidNodes = null;
}
prepare() {
this._storageUsageNodes = document.querySelectorAll('.storage-usage');
this._storageQuotaNodes = document.querySelectorAll('.storage-quota');
this._storageUseFiniteNodes = document.querySelectorAll('.storage-use-finite');
this._storageUseInfiniteNodes = document.querySelectorAll('.storage-use-infinite');
this._storageUseValidNodes = document.querySelectorAll('.storage-use-valid');
this._storageUseInvalidNodes = document.querySelectorAll('.storage-use-invalid');
document.querySelector('#storage-refresh').addEventListener('click', this._onStorageRefreshButtonClick.bind(this), false);
yomichan.on('storageChanged', this._onStorageChanged.bind(this));
this._updateStats();
}
// Private
_onStorageRefreshButtonClick() {
this._updateStats();
}
_onStorageChanged() {
this._updateStats();
}
async _updateStats() {
if (this._isUpdating) { return; }
try {
this._isUpdating = true;
const estimate = await this._storageEstimate();
const valid = (estimate !== null);
// Firefox reports usage as 0 when persistent storage is enabled.
const finite = valid && (estimate.usage > 0 || !(await this._persistentStorageController.isStoragePeristent()));
if (finite) {
for (const node of this._storageUsageNodes) {
node.textContent = this._bytesToLabeledString(estimate.usage);
}
for (const node of this._storageQuotaNodes) {
node.textContent = this._bytesToLabeledString(estimate.quota);
}
}
this._setElementsVisible(this._storageUseFiniteNodes, valid && finite);
this._setElementsVisible(this._storageUseInfiniteNodes, valid && !finite);
this._setElementsVisible(this._storageUseValidNodes, valid);
this._setElementsVisible(this._storageUseInvalidNodes, !valid);
return valid;
} finally {
this._isUpdating = false;
}
}
// Private
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', 'TB'];
const maxLabelIndex = labels.length - 1;
let labelIndex = 0;
while (size >= base && labelIndex < maxLabelIndex) {
size /= base;
++labelIndex;
}
const label = labelIndex === 0 ? `${size}` : size.toFixed(1);
return `${label}${labels[labelIndex]}`;
}
_setElementsVisible(elements, visible) {
visible = !visible;
for (const element of elements) {
element.hidden = visible;
}
}
}
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