144 lines
3.7 KiB
JavaScript
144 lines
3.7 KiB
JavaScript
/*
|
|
* Copyright © 2020 Luciano Iam <lucianito@gmail.com>
|
|
*
|
|
* 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 2 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, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
import { ControlMixin } from './control.js';
|
|
import { MetadataMixin } from './metadata.js';
|
|
import { Message } from './message.js';
|
|
import { MessageChannel } from './channel.js';
|
|
|
|
// See ControlMixin and MetadataMixin for available APIs
|
|
// See ArdourCallback for an example callback implementation
|
|
|
|
class BaseArdourClient {
|
|
|
|
constructor (host) {
|
|
this._callbacks = [];
|
|
this._connected = false;
|
|
this._pendingRequest = null;
|
|
this._channel = new MessageChannel(host || location.host);
|
|
|
|
this._channel.onError = (error) => {
|
|
this._fireCallbacks('error', error);
|
|
};
|
|
|
|
this._channel.onMessage = (msg) => {
|
|
this._onChannelMessage(msg);
|
|
};
|
|
}
|
|
|
|
addCallbacks (callbacks) {
|
|
this._callbacks.push(callbacks);
|
|
}
|
|
|
|
async connect (autoReconnect) {
|
|
this._channel.onClose = async () => {
|
|
if (this._connected) {
|
|
this._fireCallbacks('disconnected');
|
|
this._connected = false;
|
|
}
|
|
|
|
if ((autoReconnect == null) || autoReconnect) {
|
|
await this._sleep(1000);
|
|
await this._connect();
|
|
}
|
|
};
|
|
|
|
await this._connect();
|
|
}
|
|
|
|
disconnect () {
|
|
this._channel.onClose = () => {};
|
|
this._channel.close();
|
|
this._connected = false;
|
|
}
|
|
|
|
send (msg) {
|
|
this._channel.send(msg);
|
|
}
|
|
|
|
// Private methods
|
|
|
|
async _connect () {
|
|
await this._channel.open();
|
|
this._connected = true;
|
|
this._fireCallbacks('connected');
|
|
}
|
|
|
|
_send (node, addr, val) {
|
|
const msg = new Message(node, addr, val);
|
|
this.send(msg);
|
|
return msg;
|
|
}
|
|
|
|
async _sendAndReceive (node, addr, val) {
|
|
return new Promise((resolve, reject) => {
|
|
const nodeAddrId = this._send(node, addr, val).nodeAddrId;
|
|
this._pendingRequest = {resolve: resolve, nodeAddrId: nodeAddrId};
|
|
});
|
|
}
|
|
|
|
async _sendRecvSingle (node, addr, val) {
|
|
return (await this._sendAndReceive (node, addr, val))[0];
|
|
}
|
|
|
|
_onChannelMessage (msg) {
|
|
if (this._pendingRequest && (this._pendingRequest.nodeAddrId == msg.nodeAddrId)) {
|
|
this._pendingRequest.resolve(msg.val);
|
|
this._pendingRequest = null;
|
|
} else {
|
|
this._fireCallbacks('message', msg);
|
|
this._fireCallbacks(msg.node, ...msg.addr, ...msg.val);
|
|
}
|
|
}
|
|
|
|
_fireCallbacks (name, ...args) {
|
|
// name_with_underscores -> onNameWithUnderscores
|
|
const method = 'on' + name.split('_').map((s) => {
|
|
return s[0].toUpperCase() + s.slice(1).toLowerCase();
|
|
}).join('');
|
|
|
|
for (const callbacks of this._callbacks) {
|
|
if (method in callbacks) {
|
|
callbacks[method](...args)
|
|
}
|
|
}
|
|
}
|
|
|
|
_fetchResponseStatusError (status) {
|
|
return new Error(`HTTP response status ${status}`);
|
|
}
|
|
|
|
async _sleep (t) {
|
|
return new Promise(resolve => setTimeout(resolve, 1000));
|
|
}
|
|
|
|
}
|
|
|
|
export class ArdourClient extends mixin(BaseArdourClient, ControlMixin, MetadataMixin) {}
|
|
|
|
function mixin (dstClass, ...classes) {
|
|
for (const srcClass of classes) {
|
|
for (const propName of Object.getOwnPropertyNames(srcClass.prototype)) {
|
|
if (propName != 'constructor') {
|
|
dstClass.prototype[propName] = srcClass.prototype[propName];
|
|
}
|
|
}
|
|
}
|
|
return dstClass;
|
|
}
|