blob: 36306ac6ed698a1e37ce50c262a1bea8b575a45d [file] [log] [blame]
// Copyright (C) 2021 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import {featureFlags} from '../common/feature_flags';
let lastReloadDialogTime = 0;
const kMinTimeBetweenDialogsMs = 10000;
const changedPaths = new Set<string>();
export function initLiveReloadIfLocalhost() {
if (!location.origin.startsWith('http://localhost:')) return;
const monitor = new EventSource('/live_reload');
monitor.onmessage = msg => {
const change = msg.data;
console.log('Live reload:', change);
changedPaths.add(change);
if (change.endsWith('.css')) {
reloadCSS();
} else if (change.endsWith('.html') || change.endsWith('.js')) {
reloadDelayed();
}
};
monitor.onerror = (err) => {
// In most cases the error is fired on reload, when the socket disconnects.
// Delay the error and the reconnection, so in the case of a reload we don't
// see any midleading message.
setTimeout(() => console.error('LiveReload SSE error', err), 1000);
};
}
function reloadCSS() {
const css = document.querySelector('link[rel=stylesheet]') as HTMLLinkElement;
if (!css) return;
const parent = css.parentElement!;
parent.removeChild(css);
parent.appendChild(css);
}
const rapidReloadFlag = featureFlags.register({
id: 'rapidReload',
name: 'Development: rapid live reload',
defaultValue: false,
description: 'During development, instantly reload the page on change. ' +
'Enables lower latency of live reload at the cost of potential ' +
'multiple re-reloads.',
devOnly: true,
});
function reloadDelayed() {
setTimeout(() => {
let pathsStr = '';
for (const path of changedPaths) {
pathsStr += path + '\n';
}
changedPaths.clear();
if (Date.now() - lastReloadDialogTime < kMinTimeBetweenDialogsMs) return;
const reload =
rapidReloadFlag.get() || confirm(`${pathsStr}changed, click to reload`);
lastReloadDialogTime = Date.now();
if (reload) {
window.location.reload();
}
}, rapidReloadFlag.get() ? 0 : 1000);
}