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/*
* Copyright (C) 2019-2021 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;
this._persistentStorageCheckbox = false;
this._storageUsageNode = null;
this._storageQuotaNode = null;
this._storageUseFiniteNodes = null;
this._storageUseInfiniteNodes = null;
this._storageUseValidNodes = null;
this._storageUseInvalidNodes = null;
}
prepare() {
this._persistentStorageCheckbox = document.querySelector('#storage-persistent-checkbox');
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');
this._preparePersistentStorage();
this.updateStats();
this._persistentStorageCheckbox.addEventListener('change', this._onPersistentStorageCheckboxChange.bind(this), false);
document.querySelector('#storage-refresh').addEventListener('click', this.updateStats.bind(this), false);
}
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._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 _preparePersistentStorage() {
if (!(navigator.storage && navigator.storage.persist)) {
// Not supported
return;
}
const info = document.querySelector('#storage-persistent-info');
if (info !== null) { info.hidden = false; }
const isStoragePeristent = await this._isStoragePeristent();
this._updateCheckbox(isStoragePeristent);
const button = document.querySelector('#storage-persistent-button');
if (button !== null) {
button.hidden = false;
button.addEventListener('click', this._onPersistStorageButtonClick.bind(this), false);
}
}
_onPersistentStorageCheckboxChange(e) {
const node = e.currentTarget;
if (!node.checked) {
node.checked = true;
return;
}
this._attemptPersistStorage();
}
_onPersistStorageButtonClick() {
const {checked} = this._persistentStorageCheckbox;
if (checked) { return; }
this._persistentStorageCheckbox.checked = !checked;
this._persistentStorageCheckbox.dispatchEvent(new Event('change'));
}
async _attemptPersistStorage() {
if (await this._isStoragePeristent()) { return; }
let isStoragePeristent = false;
try {
isStoragePeristent = await navigator.storage.persist();
} catch (e) {
// NOP
}
this._updateCheckbox(isStoragePeristent);
if (isStoragePeristent) {
this.updateStats();
} else {
const node = document.querySelector('#storage-persistent-fail-warning');
if (node !== null) { node.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', '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]}`;
}
async _isStoragePeristent() {
try {
return await navigator.storage.persisted();
} catch (e) {
// NOP
}
return false;
}
_updateCheckbox(isStoragePeristent) {
const checkbox = this._persistentStorageCheckbox;
checkbox.checked = isStoragePeristent;
checkbox.readOnly = isStoragePeristent;
}
_setElementsVisible(elements, visible) {
visible = !visible;
for (const element of elements) {
element.hidden = visible;
}
}
}
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