1f701bd265
This patch adds basic functionality for translating speech to text, using the Google speech API, from audio received over a websocket after a successful negotiation with Asterisk using the Asterisk External Application Protocol.
120 lines
2.9 KiB
JavaScript
120 lines
2.9 KiB
JavaScript
/*
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* Copyright 2022 Sangoma Technologies Corporation
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* Kevin Harwell <kharwell@sangoma.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const EventEmitter = require("events");
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const { WebSocketServer } = require("ws");
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/*
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* For server accepting clients implementer.
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*
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* Basic server public interface:
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*
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* function close() - shutdowns the server
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* event connection(client) - triggered when a client connects
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*
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* Basic client public interface:
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*
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* function send(data, { binary: <boolean> }) - sends data to client
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* event close() - triggered when a client closes
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* event message(data, isBinary) - triggered when data is received
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*/
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const DEFAULT_PORT = 9099;
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/**
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* @class WSServer.
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*
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* Wrapper around a websocket server. Starts listening on a given port, and
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* emits a "connection" event when a client connects.
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*
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* @extends EventEmitter
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*/
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class WSServer extends EventEmitter {
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/**
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* Creates an instance of a Websocket server.
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*
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* @param {Object} [options] - websocket server specific options
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* @param {Object} [options.port=9099] - Port to listen on
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*/
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constructor(options) {
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super();
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this.port = options && options.port || DEFAULT_PORT;
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this.ws = new WebSocketServer({
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port: this.port,
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clientTracking: true,
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});
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this.ws.on("listening", () => {
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console.info("Server on port '" + this.port + "': started listening");
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});
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this.ws.on("close", () => {
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console.info("Server on port '" + this.port + "': stopped listening");
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});
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this.ws.on("error", (error) => {
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console.error(error);
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});
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this.ws.on("connection", (client) => {
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console.info("Server on port '" + this.port + "': client connected");
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/**
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* Client connect event.
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*
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* @event WSServer#connection
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* @type {object}
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*/
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this.emit("connection", client);
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});
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}
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/**
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* Close/Stop the server disconnecting all clients
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*/
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close() {
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for (let client of this.ws.clients) {
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console.log("WSServer: close client");
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client.close();
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}
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this.ws.close((error) => {
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console.log("error " + error);
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});
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}
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}
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/**
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* Gets a server.
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*
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* @param {string} name - A server type name
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* @param {Object} options - Server specific options
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* @return A server.
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*/
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function getServer(name, options) {
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if (name == "ws") {
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return new WSServer(options);
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}
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throw new Error("Unsupported server type '" + name + "'");
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}
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module.exports = {
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getServer,
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}
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