134 lines
2.9 KiB
JavaScript
134 lines
2.9 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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export const JSON_INF = 1.0e+128;
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export const Node = Object.freeze({
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TEMPO: 'tempo',
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STRIP_DESC: 'strip_desc',
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STRIP_METER: 'strip_meter',
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STRIP_GAIN: 'strip_gain',
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STRIP_PAN: 'strip_pan',
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STRIP_MUTE: 'strip_mute',
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STRIP_PLUGIN_DESC: 'strip_plugin_desc',
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STRIP_PLUGIN_ENABLE: 'strip_plugin_enable',
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STRUP_PLUGIN_PARAM_DESC: 'strip_plugin_param_desc',
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STRIP_PLUGIN_PARAM_VALUE: 'strip_plugin_param_value'
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});
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export function nodeAddressHash(node, addr) {
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return [node].concat(addr || []).join('_');
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}
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export 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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}
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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.closeCallback();
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this.socket.onerror = (error) => this.errorCallback(error);
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this.socket.onmessage = (event) => {
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this.messageCallback (Message.fromJsonText(event.data));
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};
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this.socket.onopen = resolve;
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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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} else {
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throw Error('MessageChannel: cannot call send() before open()');
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}
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}
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closeCallback () {
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// empty
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}
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errorCallback (error) {
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// empty
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}
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messageCallback (msg) {
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// empty
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}
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}
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export class Message {
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constructor (node, addr, val) {
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this.node = node;
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this.addr = addr;
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this.val = [];
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for (const i in val) {
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if (val[i] >= JSON_INF) {
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this.val.push(Infinity);
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} else if (val[i] <= -JSON_INF) {
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this.val.push(-Infinity);
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} else {
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this.val.push(val[i]);
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}
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}
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}
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static fromJsonText (jsonText) {
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let rawMsg = JSON.parse(jsonText);
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return new Message(rawMsg.node, rawMsg.addr || [], rawMsg.val);
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}
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toJsonText () {
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let val = [];
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for (const i in this.val) {
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if (this.val[i] == Infinity) {
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val.push(JSON_INF);
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} else if (this.val[i] == -Infinity) {
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val.push(-JSON_INF);
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} else {
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val.push(this.val[i]);
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}
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}
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return JSON.stringify({node: this.node, addr: this.addr, val: val});
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}
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get hash () {
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return nodeAddressHash(this.node, this.addr);
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}
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toString () {
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return `${this.node} (${this.addr}) = ${this.val}`;
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}
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}
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