82 lines
2.1 KiB
JavaScript
82 lines
2.1 KiB
JavaScript
/*
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* Copyright © 2020 Luciano Iam <oss@lucianoiam.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 { Message } from './protocol.js';
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export default class MessageChannel {
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constructor (host) {
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// https://developer.mozilla.org/en-US/docs/Web/API/URL/host
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this._host = host;
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this._pending = null;
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}
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async open () {
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return new Promise((resolve, reject) => {
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this._socket = new WebSocket(`ws://${this._host}`);
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this._socket.onclose = () => this.onClose();
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this._socket.onerror = (error) => this.onError(error);
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this._socket.onmessage = (event) => {
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const msg = Message.fromJsonText(event.data);
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if (this._pending && (this._pending.nodeAddrId == msg.nodeAddrId)) {
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this._pending.resolve(msg);
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this._pending = null;
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} else {
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this.onMessage(msg, true);
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}
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};
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this._socket.onopen = resolve;
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});
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}
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close () {
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this._socket.close();
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if (this._pending) {
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this._pending.reject(Error('MessageChannel: socket closed awaiting response'));
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this._pending = null;
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}
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}
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send (msg) {
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if (this._socket) {
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this._socket.send(msg.toJsonText());
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this.onMessage(msg, false);
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} else {
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this.onError(Error('MessageChannel: cannot call send() before open()'));
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}
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}
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async sendAndReceive (msg) {
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return new Promise((resolve, reject) => {
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this._pending = {resolve: resolve, reject: reject, nodeAddrId: msg.nodeAddrId};
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this.send(msg);
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});
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}
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onClose () {}
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onError (error) {}
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onMessage (msg, inbound) {}
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}
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