aboutsummaryrefslogtreecommitdiff
path: root/ext/bg/js/settings/storage-controller.js
diff options
context:
space:
mode:
Diffstat (limited to 'ext/bg/js/settings/storage-controller.js')
-rw-r--r--ext/bg/js/settings/storage-controller.js131
1 files changed, 131 insertions, 0 deletions
diff --git a/ext/bg/js/settings/storage-controller.js b/ext/bg/js/settings/storage-controller.js
new file mode 100644
index 00000000..24c6d7ef
--- /dev/null
+++ b/ext/bg/js/settings/storage-controller.js
@@ -0,0 +1,131 @@
+/*
+ * 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;
+ }
+}