123 lines
4.3 KiB
JavaScript
123 lines
4.3 KiB
JavaScript
/*
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* Copyright (C) 2019-2022 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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class StorageController {
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constructor(persistentStorageController) {
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this._persistentStorageController = persistentStorageController;
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this._mostRecentStorageEstimate = null;
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this._storageEstimateFailed = false;
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this._isUpdating = false;
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this._storageUsageNode = null;
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this._storageQuotaNode = null;
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this._storageUseFiniteNodes = null;
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this._storageUseInfiniteNodes = null;
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this._storageUseValidNodes = null;
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this._storageUseInvalidNodes = null;
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}
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prepare() {
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this._storageUsageNodes = document.querySelectorAll('.storage-usage');
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this._storageQuotaNodes = document.querySelectorAll('.storage-quota');
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this._storageUseFiniteNodes = document.querySelectorAll('.storage-use-finite');
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this._storageUseInfiniteNodes = document.querySelectorAll('.storage-use-infinite');
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this._storageUseValidNodes = document.querySelectorAll('.storage-use-valid');
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this._storageUseInvalidNodes = document.querySelectorAll('.storage-use-invalid');
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document.querySelector('#storage-refresh').addEventListener('click', this._onStorageRefreshButtonClick.bind(this), false);
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yomichan.on('storageChanged', this._onStorageChanged.bind(this));
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this._updateStats();
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}
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// Private
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_onStorageRefreshButtonClick() {
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this._updateStats();
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}
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_onStorageChanged() {
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this._updateStats();
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}
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async _updateStats() {
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if (this._isUpdating) { return; }
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try {
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this._isUpdating = true;
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const estimate = await this._storageEstimate();
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const valid = (estimate !== null);
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// Firefox reports usage as 0 when persistent storage is enabled.
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const finite = valid && (estimate.usage > 0 || !(await this._persistentStorageController.isStoragePeristent()));
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if (finite) {
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for (const node of this._storageUsageNodes) {
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node.textContent = this._bytesToLabeledString(estimate.usage);
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}
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for (const node of this._storageQuotaNodes) {
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node.textContent = this._bytesToLabeledString(estimate.quota);
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}
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}
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this._setElementsVisible(this._storageUseFiniteNodes, valid && finite);
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this._setElementsVisible(this._storageUseInfiniteNodes, valid && !finite);
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this._setElementsVisible(this._storageUseValidNodes, valid);
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this._setElementsVisible(this._storageUseInvalidNodes, !valid);
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return valid;
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} finally {
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this._isUpdating = false;
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}
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}
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// Private
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async _storageEstimate() {
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if (this._storageEstimateFailed && this._mostRecentStorageEstimate === null) {
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return null;
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}
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try {
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const value = await navigator.storage.estimate();
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this._mostRecentStorageEstimate = value;
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return value;
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} catch (e) {
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this._storageEstimateFailed = true;
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}
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return null;
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}
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_bytesToLabeledString(size) {
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const base = 1000;
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const labels = [' bytes', 'KB', 'MB', 'GB', 'TB'];
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const maxLabelIndex = labels.length - 1;
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let labelIndex = 0;
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while (size >= base && labelIndex < maxLabelIndex) {
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size /= base;
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++labelIndex;
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}
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const label = labelIndex === 0 ? `${size}` : size.toFixed(1);
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return `${label}${labels[labelIndex]}`;
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}
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_setElementsVisible(elements, visible) {
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visible = !visible;
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for (const element of elements) {
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element.hidden = visible;
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}
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}
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}
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