@signalk/streams/dist/udp.js

Utilities for handling streams of Signal K data

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const dgram_1 = require("dgram");
const stream_1 = require("stream");
class Udp extends stream_1.Transform {
    options;
    debug;
    socket = null;
    pipeTo = null;
    constructor(options) {
        super({ objectMode: false });
        this.options = options;
        const createDebug = options.createDebug ?? require('debug');
        this.debug = createDebug('signalk:streams:udp');
    }
    pipe(pipeTo) {
        this.pipeTo = pipeTo;
        super.pipe(pipeTo);
        const socket = (0, dgram_1.createSocket)('udp4');
        this.socket = socket;
        if (this.options.outEvent && this.options.port !== undefined) {
            this.options.app.on(this.options.outEvent, (d) => {
                this.debug('sending over udp: %s', d);
                socket.send(d, 0, d.length, this.options.port, this.options.host ?? '255.255.255.255');
            });
        }
        socket.on('message', (message) => {
            this.debug(message.toString());
            this.push(message);
        });
        socket.on('error', (err) => {
            this.options.app.setProviderError(this.options.providerId, err.message);
            console.error('UdpProvider:' + err);
        });
        socket.bind(this.options.port, () => {
            socket.setBroadcast(true);
        });
        return pipeTo;
    }
    _transform(chunk, encoding, done) {
        done();
    }
    end() {
        if (this.socket) {
            this.socket.close();
        }
        if (this.pipeTo) {
            this.pipeTo.end();
        }
        return this;
    }
}
exports.default = Udp;