153 lines
3.7 KiB
JavaScript
153 lines
3.7 KiB
JavaScript
/*
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* Copyright © 2020 Luciano Iam <lucianito@gmail.com>
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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 2 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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import { Component } from './base/component.js';
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import { StateNode } from './base/protocol.js';
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import MessageChannel from './base/channel.js';
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import Mixer from './components/mixer.js';
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import Transport from './components/transport.js';
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function getOption (options, key, defaultValue) {
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return options ? (key in options ? options[key] : defaultValue) : defaultValue;
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}
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export default class ArdourClient extends Component {
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constructor (options) {
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super(new MessageChannel(getOption(options, 'host', location.host)));
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if (getOption(options, 'components', true)) {
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this._mixer = new Mixer(this);
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this._transport = new Transport(this);
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this._components = [this._mixer, this._transport];
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} else {
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this._components = [];
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}
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this._autoReconnect = getOption(options, 'autoReconnect', true);
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this._connected = false;
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this.channel.onMessage = (msg, inbound) => this._handleMessage(msg, inbound);
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this.channel.onError = (err) => this.notifyObservers('error', err);
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}
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// Access to the object-oriented API (enabled by default)
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get mixer () {
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return this._mixer;
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}
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get transport () {
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return this._transport;
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}
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// Low level control messages flow through a WebSocket
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async connect () {
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this.channel.onClose = async () => {
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if (this._connected) {
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this._setConnected(false);
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}
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if (this._autoReconnect) {
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await this._sleep(1000);
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await this._connect();
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}
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};
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await this._connect();
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}
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disconnect () {
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this.channel.onClose = () => {};
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this.channel.close();
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this._connected = false;
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}
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send (msg) {
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this.channel.send(msg);
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}
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async sendAndReceive (msg) {
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return await this.channel.sendAndReceive(msg);
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}
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// Surface metadata API goes over HTTP
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async getAvailableSurfaces () {
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const response = await fetch('/surfaces.json');
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if (response.status == 200) {
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return await response.json();
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} else {
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throw this._fetchResponseStatusError(response.status);
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}
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}
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async getSurfaceManifest () {
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const response = await fetch('manifest.xml');
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if (response.status == 200) {
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const manifest = {};
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const xmlText = await response.text();
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const xmlDoc = new DOMParser().parseFromString(xmlText, 'text/xml');
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for (const child of xmlDoc.children[0].children) {
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manifest[child.tagName.toLowerCase()] = child.getAttribute('value');
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}
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return manifest;
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} else {
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throw this._fetchResponseStatusError(response.status);
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}
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}
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// Private methods
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async _sleep (t) {
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return new Promise(resolve => setTimeout(resolve, t));
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}
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async _connect () {
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await this.channel.open();
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this._setConnected(true);
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}
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_setConnected (connected) {
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this._connected = connected;
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this.notifyPropertyChanged('connected');
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}
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_handleMessage (msg, inbound) {
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this.notifyObservers('message', msg, inbound);
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if (inbound) {
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for (const component of this._components) {
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if (component.handleMessage(msg)) {
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break;
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}
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}
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}
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}
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_fetchResponseStatusError (status) {
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return new Error(`HTTP response status ${status}`);
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}
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}
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