Md Imran Hossain
137b9d9547
A minimal CoAP (RFC 7252) server built on coap-lite for message encoding and a tokio UdpSocket for transport. The socket, read loop and routing are kept in src/main.rs rather than behind a framework. Routes: GET /hello[?name=X] -> 2.05 "Hello, X!" (defaults to World) POST /hello -> 2.01, name from a raw text or JSON body GET /health -> 2.05 status + uptime Unknown paths return 4.04, known paths with the wrong method 4.05. Includes a CLI client (src/bin/client.rs) for smoke tests and unit tests covering the greeting, payload parsing and query decoding. Verified against node-coap as an independent implementation to confirm wire compatibility. The earlier Node.js prototype is kept under nodejs/ for reference. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
103 lines
2.9 KiB
JavaScript
103 lines
2.9 KiB
JavaScript
'use strict';
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const coap = require('coap');
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const PORT = Number(process.env.COAP_PORT) || 5683;
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const HOST = process.env.COAP_HOST || '0.0.0.0';
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// --- helpers ---------------------------------------------------------------
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const TEXT = 'text/plain';
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const JSON_FMT = 'application/json';
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/** Split "/hello?name=Bob" into ["/hello", "name=Bob"]. */
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function splitUrl(url) {
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const i = url.indexOf('?');
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const path = (i === -1 ? url : url.slice(0, i)).replace(/\/+$/, '') || '/';
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return [path, i === -1 ? '' : url.slice(i + 1)];
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}
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/** Pull a name out of "?name=Bob" style queries. */
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function nameFromQuery(query) {
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return new URLSearchParams(query || '').get('name');
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}
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/** Pull a name out of a POST body: raw text or {"name":"Bob"}. */
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function nameFromBody(buf) {
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const body = buf.toString('utf8').trim();
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if (!body) return null;
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if (body.startsWith('{')) {
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try {
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const parsed = JSON.parse(body);
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return typeof parsed.name === 'string' ? parsed.name.trim() : null;
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} catch {
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return null;
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}
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}
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return body;
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}
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function greet(name) {
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return `Hello, ${name && name.length ? name : 'World'}!`;
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}
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function send(res, code, payload, format = TEXT) {
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res.code = code;
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res.setOption('Content-Format', format);
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res.end(typeof payload === 'string' ? payload : JSON.stringify(payload));
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}
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// --- routes ----------------------------------------------------------------
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// key: "METHOD /path"
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const routes = {
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'GET /hello': (req, res) => {
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send(res, '2.05', greet(nameFromQuery(req.query)));
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},
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'POST /hello': (req, res) => {
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const name = nameFromBody(req.payload) || nameFromQuery(req.query);
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if (!name) {
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return send(res, '4.00', 'Bad Request: send a name as the payload');
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}
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send(res, '2.01', greet(name));
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},
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'GET /health': (_req, res) => {
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send(res, '2.05', { status: 'ok', uptime: Math.round(process.uptime()) }, JSON_FMT);
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},
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};
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// --- server ----------------------------------------------------------------
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const server = coap.createServer({ type: 'udp4' });
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server.on('request', (req, res) => {
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const [path, query] = splitUrl(req.url);
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req.query = query; // node-coap only gives us req.url on the server side
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const key = `${req.method} ${path}`;
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const handler = routes[key];
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console.log(`${req.method} ${req.url} from ${req.rsinfo.address}:${req.rsinfo.port}`);
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if (!handler) return send(res, '4.04', `Not Found: ${path}`);
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try {
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handler(req, res);
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} catch (err) {
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console.error('handler error:', err);
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send(res, '5.00', 'Internal Server Error');
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}
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});
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server.on('error', (err) => console.error('server error:', err));
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server.listen(PORT, HOST, () => {
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console.log(`CoAP server (UDP) listening on coap://${HOST}:${PORT}`);
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console.log(' GET /hello?name=Imran');
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console.log(' POST /hello (payload: Imran | {"name":"Imran"})');
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console.log(' GET /health');
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});
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process.on('SIGINT', () => server.close(() => process.exit(0)));
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