47 lines
1.4 KiB
TypeScript
47 lines
1.4 KiB
TypeScript
import EventEmitter from "node:events";
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import { create_LanSearchExt, create_LanSearch, parse_PunchPkt } from "./impl.js";
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import { createSocket, RemoteInfo } from "node:dgram";
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import { Commands } from "./datatypes.js";
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import { logger } from "./logger.js";
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const handleIncomingPunch = (msg: Buffer, ee: EventEmitter, rinfo: RemoteInfo) => {
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const ab = new Uint8Array(msg).buffer;
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const dv = new DataView(ab);
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const cmd_id = dv.readU16();
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if (cmd_id != Commands.PunchPkt) {
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return;
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}
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logger.debug("Received a PunchPkt message");
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ee.emit("discover", rinfo, parse_PunchPkt(dv));
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};
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export const discoverDevices = (discovery_ip: string): EventEmitter => {
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const sock = createSocket("udp4");
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const SEND_PORT = 32108;
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const ee = new EventEmitter();
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sock.on("error", (err) => {
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console.error(`sock error:\n${err.stack}`);
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sock.close();
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});
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sock.on("message", (msg, rinfo) => handleIncomingPunch(msg, ee, rinfo));
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sock.on("listening", () => {
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sock.setBroadcast(true);
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logger.info(`Searching for devices on ${discovery_ip}`);
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let ls_buf = create_LanSearch();
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setInterval(() => {
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logger.log("trace", `>> LanSearch`);
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sock.send(new Uint8Array(ls_buf.buffer), SEND_PORT, discovery_ip);
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}, 3000);
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logger.log("trace", `>> LanSearch`);
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sock.send(new Uint8Array(ls_buf.buffer), SEND_PORT, discovery_ip);
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});
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sock.bind();
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return ee;
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};
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