From c4f4500fe5b5b393de5f3ced9c696f008a6b3a4b Mon Sep 17 00:00:00 2001 From: kenedybokephraim-boop Date: Wed, 22 Jul 2026 16:20:58 +0100 Subject: [PATCH 1/5] feat: add co-located HTTP server with health checks, Prometheus metrics, and WebSocket upgrade detection on shared port Implement an HTTP server as the primary listener using Node.js built-in http module, with WebSocketServer running in noServer: true mode. Incoming requests are inspected for the Upgrade header to correctly route WebSocket upgrades vs plain HTTP requests. Endpoints: - GET /healthz: Liveness probe returning 200 with uptime (503 during shutdown) - GET /readyz: Readiness probe returning 200 with connection/room counts - GET /metrics: Prometheus exposition format with 7 metrics (connections, rooms, messages, rate limit rejections, auth failures, heap usage, event loop lag) Features: - Protocol detection on shared port (HTTP vs WebSocket upgrade) - Event loop lag measurement via setTimeout(0) drift every 5 seconds - Atomic metrics counters for message types, auth failures, and rate limits - Graceful shutdown integration: markShuttingDown sets probes to 503, then closes both WSS and HTTP server - wss.address() patched to return httpServer.address() for test compatibility Closes #199 --- src/index.js | 18 ++- src/server.js | 124 +++++++++++++++++-- tests/http-endpoints.test.js | 223 +++++++++++++++++++++++++++++++++++ 3 files changed, 352 insertions(+), 13 deletions(-) create mode 100644 tests/http-endpoints.test.js diff --git a/src/index.js b/src/index.js index dceaf00..fded7a2 100644 --- a/src/index.js +++ b/src/index.js @@ -32,8 +32,10 @@ if (isNaN(config.maxPayloadBytes) || config.maxPayloadBytes < 1) { } let wss; +let httpServer; +let markShuttingDown; try { - ({ wss } = createServer(config)); + ({ wss, httpServer, markShuttingDown } = createServer(config)); } catch (err) { logger.error("Failed to start server", { error: err.message }); process.exit(1); @@ -42,7 +44,7 @@ try { logger.info("Gateway started", config); /** - * Initiates a graceful shutdown of the WebSocket server. + * Initiates a graceful shutdown of the server. * * Closes the server and waits for existing connections to finish. If the * server does not close within 5 seconds, a forced exit is triggered. @@ -63,8 +65,16 @@ export function shutdown(server, signal) { }, 5000); } -process.on("SIGTERM", () => shutdown(wss, "SIGTERM")); -process.on("SIGINT", () => shutdown(wss, "SIGINT")); +process.on("SIGTERM", () => { + markShuttingDown(); + wss.close(); + shutdown(httpServer, "SIGTERM"); +}); +process.on("SIGINT", () => { + markShuttingDown(); + wss.close(); + shutdown(httpServer, "SIGINT"); +}); process.on("uncaughtException", (err) => { logger.error("Uncaught exception", { error: err.message }); diff --git a/src/server.js b/src/server.js index 6f0b84f..dab01da 100644 --- a/src/server.js +++ b/src/server.js @@ -1,3 +1,4 @@ +import http from "node:http"; import { WebSocketServer } from "ws"; import { v4 as uuid } from "uuid"; import { RoomManager } from "./room-manager.js"; @@ -7,16 +8,94 @@ import { logger } from "./logger.js"; import { createConnRateLimiter } from "./conn-rate-limiter.js"; export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit, maxConnectionsPerIp } = {}) { - const wss = new WebSocketServer({ - port: port ?? 8080, - maxPayload: maxPayloadBytes ?? 1024, - }); - const rooms = new RoomManager(); const connRateLimiter = createConnRateLimiter(connRateLimit); const ipConnectionCount = new Map(); const MAX_CONNS_PER_IP = maxConnectionsPerIp ?? (Number(process.env.MAX_CONNECTIONS_PER_IP) || 10); + const metrics = { + messages: { location_update: 0, join_room: 0, leave_room: 0 }, + authFailures: 0, + rateLimitRejections: { connection: 0 }, + eventLoopLagMs: 0, + }; + + let isReady = false; + let isShuttingDown = false; + + const wss = new WebSocketServer({ + noServer: true, + maxPayload: maxPayloadBytes ?? 1024, + }); + + const httpServer = http.createServer((req, res) => { + if (req.method !== "GET") { + res.writeHead(405); + res.end("Method Not Allowed"); + return; + } + + const pathname = new URL(req.url, `http://${req.headers.host ?? "localhost"}`).pathname; + + if (pathname === "/healthz") { + if (isShuttingDown) { + res.writeHead(503, { "Content-Type": "application/json" }); + res.end(JSON.stringify({ status: "shutting down" })); + return; + } + res.writeHead(200, { "Content-Type": "application/json" }); + res.end(JSON.stringify({ status: "ok", uptime: process.uptime() })); + } else if (pathname === "/readyz") { + if (isShuttingDown) { + res.writeHead(503, { "Content-Type": "application/json" }); + res.end(JSON.stringify({ status: "not ready", reason: "server is shutting down" })); + return; + } + if (!isReady) { + res.writeHead(503, { "Content-Type": "application/json" }); + res.end(JSON.stringify({ status: "not ready", reason: "initializing" })); + return; + } + res.writeHead(200, { "Content-Type": "application/json" }); + res.end(JSON.stringify({ + status: "ready", + connections: wss.clients.size, + rooms: rooms.roomCount, + })); + } else if (pathname === "/metrics") { + const mem = process.memoryUsage(); + const lines = [ + "# TYPE gateway_connections_active gauge", + `gateway_connections_active ${wss.clients.size}`, + "# TYPE gateway_rooms_active gauge", + `gateway_rooms_active ${rooms.roomCount}`, + "# TYPE gateway_messages_total counter", + `gateway_messages_total{type="location_update"} ${metrics.messages.location_update}`, + `gateway_messages_total{type="join_room"} ${metrics.messages.join_room}`, + `gateway_messages_total{type="leave_room"} ${metrics.messages.leave_room}`, + "# TYPE gateway_rate_limit_rejections_total counter", + `gateway_rate_limit_rejections_total{kind="connection"} ${metrics.rateLimitRejections.connection}`, + "# TYPE gateway_auth_failures_total counter", + `gateway_auth_failures_total ${metrics.authFailures}`, + "# TYPE gateway_heap_used_bytes gauge", + `gateway_heap_used_bytes ${mem.heapUsed}`, + "# TYPE gateway_event_loop_lag_ms gauge", + `gateway_event_loop_lag_ms ${metrics.eventLoopLagMs}`, + ]; + res.writeHead(200, { "Content-Type": "text/plain; version=0.0.4; charset=utf-8" }); + res.end(lines.join("\n") + "\n"); + } else { + res.writeHead(404); + res.end("Not Found"); + } + }); + + httpServer.on("upgrade", (req, socket, head) => { + wss.handleUpgrade(req, socket, head, (ws) => { + wss.emit("connection", ws, req); + }); + }); + function heartbeat() { this.isAlive = true; } @@ -29,6 +108,7 @@ export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit if (!connRateLimiter.check(ip)) { logger.warn("Connection rate limit exceeded", { ip }); + metrics.rateLimitRejections.connection++; ws.close(4029, "Connection rate limit exceeded"); return; } @@ -36,6 +116,7 @@ export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit const currentCount = ipConnectionCount.get(ip) ?? 0; if (currentCount >= MAX_CONNS_PER_IP) { logger.warn("Max connections per IP exceeded", { ip }); + metrics.rateLimitRejections.connection++; ws.close(4029, "Too many connections from this IP"); return; } @@ -56,6 +137,7 @@ export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit if (!authResult.ok) { logger.warn("Authentication failed", { clientId, reason: authResult.error }); + metrics.authFailures++; ws.close(4001, authResult.error); return; } @@ -79,17 +161,20 @@ export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit switch (msg.type) { case "join_room": { rooms.join(actualClientId, msg.roomId, ws); + metrics.messages.join_room++; logger.info("Client joined room", { clientId: actualClientId, roomId: msg.roomId }); ws.send(JSON.stringify({ type: "room_joined", payload: { roomId: msg.roomId } })); break; } case "leave_room": { rooms.leave(actualClientId, msg.roomId); + metrics.messages.leave_room++; logger.info("Client left room", { clientId: actualClientId, roomId: msg.roomId }); ws.send(JSON.stringify({ type: "room_left", payload: { roomId: msg.roomId } })); break; } case "location_update": { + metrics.messages.location_update++; const roomIds = rooms.getClientRooms(actualClientId); for (const roomId of roomIds) { rooms.broadcast(roomId, { @@ -125,7 +210,7 @@ export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit }); }); - const interval = setInterval(() => { + const heartbeatInterval = setInterval(() => { wss.clients.forEach((ws) => { if (ws.isAlive === false) { logger.warn("Terminating zombie connection", { clientId: ws._clientId ?? "unknown" }); @@ -136,9 +221,30 @@ export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit }); }, heartbeatMs ?? 30000); - wss.on("close", () => { - clearInterval(interval); + function measureLag() { + const start = Date.now(); + setTimeout(() => { + metrics.eventLoopLagMs = Date.now() - start; + }, 0); + } + const lagInterval = setInterval(measureLag, 5000); + measureLag(); + + httpServer.on("close", () => { + clearInterval(heartbeatInterval); + clearInterval(lagInterval); }); - return { wss, rooms, ipConnectionCount }; + httpServer.listen(port ?? 8080); + + wss.address = () => httpServer.address(); + + function markShuttingDown() { + isShuttingDown = true; + isReady = false; + } + + isReady = true; + + return { wss, httpServer, rooms, metrics, ipConnectionCount, markShuttingDown }; } diff --git a/tests/http-endpoints.test.js b/tests/http-endpoints.test.js new file mode 100644 index 0000000..1a7c5f1 --- /dev/null +++ b/tests/http-endpoints.test.js @@ -0,0 +1,223 @@ +import { describe, it, expect, beforeEach, afterEach } from "vitest"; +import http from "node:http"; +import WebSocket from "ws"; +import jwt from "jsonwebtoken"; +import { createServer } from "../src/server.js"; + +const TEST_SECRET = "test-secret-key"; + +function makeToken(clientId) { + return jwt.sign({ sub: clientId }, TEST_SECRET, { expiresIn: 60 }); +} + +function httpGet(port, path) { + return new Promise((resolve, reject) => { + const req = http.get(`http://localhost:${port}${path}`, (res) => { + const chunks = []; + res.on("data", (chunk) => chunks.push(chunk)); + res.on("end", () => { + resolve({ status: res.statusCode, headers: res.headers, body: Buffer.concat(chunks).toString() }); + }); + }); + req.on("error", reject); + }); +} + +describe("HTTP endpoints", () => { + let server; + let port; + + beforeEach(() => { + process.env.AUTH_SECRET = TEST_SECRET; + server = createServer({ port: 0, heartbeatMs: 60000, maxPayloadBytes: 4096 }); + port = server.httpServer.address().port; + }); + + afterEach(async () => { + for (const client of server.wss.clients) { + client.terminate(); + } + server.wss.close(); + await new Promise((resolve) => server.httpServer.close(resolve)); + delete process.env.AUTH_SECRET; + }); + + describe("GET /healthz", () => { + it("returns 200 with status ok and uptime", async () => { + const res = await httpGet(port, "/healthz"); + expect(res.status).toBe(200); + expect(res.headers["content-type"]).toContain("application/json"); + const body = JSON.parse(res.body); + expect(body.status).toBe("ok"); + expect(typeof body.uptime).toBe("number"); + expect(body.uptime).toBeGreaterThanOrEqual(0); + }); + + it("returns 503 during shutdown", async () => { + server.markShuttingDown(); + const res = await httpGet(port, "/healthz"); + expect(res.status).toBe(503); + const body = JSON.parse(res.body); + expect(body.status).toBe("shutting down"); + }); + }); + + describe("GET /readyz", () => { + it("returns 200 with ready status when initialized", async () => { + const res = await httpGet(port, "/readyz"); + expect(res.status).toBe(200); + const body = JSON.parse(res.body); + expect(body.status).toBe("ready"); + expect(typeof body.connections).toBe("number"); + expect(typeof body.rooms).toBe("number"); + }); + + it("returns 503 during shutdown", async () => { + server.markShuttingDown(); + const res = await httpGet(port, "/readyz"); + expect(res.status).toBe(503); + const body = JSON.parse(res.body); + expect(body.status).toBe("not ready"); + expect(body.reason).toBe("server is shutting down"); + }); + + it("reports active connections and rooms", async () => { + const token = makeToken("ready-client"); + const ws = new WebSocket(`ws://localhost:${port}/?token=${token}`); + await new Promise((resolve) => ws.once("open", resolve)); + + const joinMsg = JSON.stringify({ type: "join_room", roomId: "ready-room" }); + await new Promise((resolve) => { + ws.once("message", resolve); + ws.send(joinMsg); + }); + + const res = await httpGet(port, "/readyz"); + const body = JSON.parse(res.body); + expect(body.connections).toBeGreaterThanOrEqual(1); + expect(body.rooms).toBeGreaterThanOrEqual(1); + + ws.close(); + await new Promise((resolve) => ws.once("close", resolve)); + }); + }); + + describe("GET /metrics", () => { + it("returns 200 with Prometheus content type", async () => { + const res = await httpGet(port, "/metrics"); + expect(res.status).toBe(200); + expect(res.headers["content-type"]).toBe("text/plain; version=0.0.4; charset=utf-8"); + }); + + it("contains all required metric names", async () => { + const res = await httpGet(port, "/metrics"); + expect(res.body).toContain("gateway_connections_active"); + expect(res.body).toContain("gateway_rooms_active"); + expect(res.body).toContain("gateway_messages_total"); + expect(res.body).toContain("gateway_rate_limit_rejections_total"); + expect(res.body).toContain("gateway_auth_failures_total"); + expect(res.body).toContain("gateway_heap_used_bytes"); + expect(res.body).toContain("gateway_event_loop_lag_ms"); + }); + + it("contains valid Prometheus TYPE declarations", async () => { + const res = await httpGet(port, "/metrics"); + expect(res.body).toContain("# TYPE gateway_connections_active gauge"); + expect(res.body).toContain("# TYPE gateway_rooms_active gauge"); + expect(res.body).toContain("# TYPE gateway_messages_total counter"); + expect(res.body).toContain("# TYPE gateway_rate_limit_rejections_total counter"); + expect(res.body).toContain("# TYPE gateway_auth_failures_total counter"); + expect(res.body).toContain("# TYPE gateway_heap_used_bytes gauge"); + expect(res.body).toContain("# TYPE gateway_event_loop_lag_ms gauge"); + }); + + it("tracks active connections", async () => { + const res0 = await httpGet(port, "/metrics"); + expect(res0.body).toContain("gateway_connections_active 0"); + + const token = makeToken("metrics-client"); + const ws = new WebSocket(`ws://localhost:${port}/?token=${token}`); + await new Promise((resolve) => ws.once("open", resolve)); + + const res1 = await httpGet(port, "/metrics"); + expect(res1.body).toContain("gateway_connections_active 1"); + + ws.close(); + await new Promise((resolve) => ws.once("close", resolve)); + }); + + it("tracks message counts", async () => { + const token = makeToken("metrics-msg-client"); + const ws = new WebSocket(`ws://localhost:${port}/?token=${token}`); + await new Promise((resolve) => ws.once("open", resolve)); + + const joinMsg = JSON.stringify({ type: "join_room", roomId: "metrics-room" }); + await new Promise((resolve) => { + ws.once("message", resolve); + ws.send(joinMsg); + }); + + const res = await httpGet(port, "/metrics"); + expect(res.body).toContain('gateway_messages_total{type="join_room"} 1'); + expect(res.body).toContain('gateway_messages_total{type="leave_room"} 0'); + expect(res.body).toContain('gateway_messages_total{type="location_update"} 0'); + + ws.close(); + await new Promise((resolve) => ws.once("close", resolve)); + }); + + it("tracks heap usage", async () => { + const res = await httpGet(port, "/metrics"); + const match = res.body.match(/gateway_heap_used_bytes (\d+)/); + expect(match).not.toBeNull(); + const heapUsed = parseInt(match[1], 10); + expect(heapUsed).toBeGreaterThan(0); + }); + }); + + describe("WebSocket upgrade on shared port", () => { + it("allows WebSocket connections on the same port as HTTP", async () => { + const token = makeToken("shared-port-client"); + const ws = new WebSocket(`ws://localhost:${port}/?token=${token}`); + await new Promise((resolve) => ws.once("open", resolve)); + expect(ws.readyState).toBe(WebSocket.OPEN); + ws.close(); + await new Promise((resolve) => ws.once("close", resolve)); + }); + + it("does not intercept HTTP requests as WebSocket upgrades", async () => { + const httpRes = await httpGet(port, "/healthz"); + expect(httpRes.status).toBe(200); + const body = JSON.parse(httpRes.body); + expect(body.status).toBe("ok"); + + const token = makeToken("coexist-client"); + const ws = new WebSocket(`ws://localhost:${port}/?token=${token}`); + await new Promise((resolve) => ws.once("open", resolve)); + expect(ws.readyState).toBe(WebSocket.OPEN); + + ws.close(); + await new Promise((resolve) => ws.once("close", resolve)); + }); + }); + + describe("HTTP error handling", () => { + it("returns 405 for non-GET requests", async () => { + const res = await new Promise((resolve, reject) => { + const req = http.request(`http://localhost:${port}/healthz`, { method: "POST" }, (r) => { + const chunks = []; + r.on("data", (c) => chunks.push(c)); + r.on("end", () => resolve({ status: r.statusCode, body: Buffer.concat(chunks).toString() })); + }); + req.on("error", reject); + req.end(); + }); + expect(res.status).toBe(405); + }); + + it("returns 404 for unknown paths", async () => { + const res = await httpGet(port, "/unknown"); + expect(res.status).toBe(404); + }); + }); +}); From fff635b81138891061f6e16f1b59c8948c140752 Mon Sep 17 00:00:00 2001 From: ayomidemariam Date: Mon, 27 Jul 2026 18:20:36 +0100 Subject: [PATCH 2/5] feat: implement backpressure-aware async broadcast with per-client drain queues - Add backpressure options to RoomManager constructor (opt-in) - Batch broadcasts using setImmediate to prevent event loop starvation - Detect slow consumers via ws.bufferedAmount high water mark - Coalesce location_update messages for slow consumers - Auto-terminate slow consumers after configurable timeout - Add getRoomStats() for observability (queue depths, slow consumers) - Clean up slow consumer state on disconnect (no memory leaks) - All existing tests pass unchanged (backward compatible) Closes #734 Closes #733 --- src/room-manager.js | 226 ++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 218 insertions(+), 8 deletions(-) diff --git a/src/room-manager.js b/src/room-manager.js index d5e4804..3eb1ae9 100644 --- a/src/room-manager.js +++ b/src/room-manager.js @@ -1,5 +1,13 @@ import { WebSocket } from "ws"; +/** + * @typedef {Object} BackpressureOptions + * @property {boolean} [enabled=false] - Enable backpressure-aware broadcasting + * @property {number} [highWaterMark=1048576] - Bytes threshold to flag client as slow (default 1MB) + * @property {number} [slowConsumerTimeout=30000] - Ms before terminating slow consumer (default 30s) + * @property {number} [batchSize=100] - Number of sends per event loop tick (default 100) + */ + /** * Manages room membership and message broadcasting for connected WebSocket clients. * @@ -7,13 +15,33 @@ import { WebSocket } from "ws"; * `clientId → WebSocket` so broadcasts are O(members). A reverse index * (`_clientRooms`) enables O(1) lookup of all rooms a client belongs to, * which is used during disconnection cleanup. + * + * When backpressure options are provided, broadcast() operates in a + * non-blocking batched mode with per-client slow consumer detection, + * message coalescing, and automatic eviction. */ export class RoomManager { - constructor() { + /** + * @param {BackpressureOptions} [backpressure] - Backpressure configuration + */ + constructor(backpressure = undefined) { /** @type {Map>} */ this._rooms = new Map(); /** @type {Map>} */ this._clientRooms = new Map(); + + /** @type {BackpressureOptions} */ + this._backpressureOptions = backpressure && backpressure.enabled + ? { + enabled: true, + highWaterMark: backpressure.highWaterMark ?? 1048576, + slowConsumerTimeout: backpressure.slowConsumerTimeout ?? 30000, + batchSize: backpressure.batchSize ?? 100, + } + : { enabled: false }; + + /** @type {Map} */ + this._clientState = new Map(); } /** @private */ @@ -32,6 +60,18 @@ export class RoomManager { return this._clientRooms.get(clientId); } + /** @private */ + _ensureClientState(clientId, ws) { + if (!this._clientState.has(clientId)) { + this._clientState.set(clientId, { + ws, + slowSince: null, + coalescedMessage: null, + }); + } + return this._clientState.get(clientId); + } + /** @private */ _cleanupRoom(roomId) { const room = this._rooms.get(roomId); @@ -48,6 +88,19 @@ export class RoomManager { } } + /** @private */ + _cleanupClientState(clientId) { + const state = this._clientState.get(clientId); + if (state) { + if (state.slowSince !== null && this._backpressureOptions.slowConsumerTimeout) { + if (state._timeoutId) { + clearTimeout(state._timeoutId); + } + } + this._clientState.delete(clientId); + } + } + join(clientId, roomId, ws) { if (clientId == null) throw new TypeError("clientId is required"); if (roomId == null) throw new TypeError("roomId is required"); @@ -55,6 +108,10 @@ export class RoomManager { this._ensureRoom(roomId).set(clientId, ws); this._ensureClientRooms(clientId).add(roomId); + + if (this._backpressureOptions.enabled) { + this._ensureClientState(clientId, ws); + } } /** @@ -81,6 +138,13 @@ export class RoomManager { clientRooms.delete(roomId); this._cleanupClient(clientId); } + + if (this._backpressureOptions.enabled) { + const clientRoomsRemaining = this._clientRooms.get(clientId); + if (!clientRoomsRemaining || clientRoomsRemaining.size === 0) { + this._cleanupClientState(clientId); + } + } } /** @@ -100,17 +164,118 @@ export class RoomManager { const room = this._rooms.get(roomId); if (!room) return; - const data = typeof message === "string" ? message : JSON.stringify(message); + if (!this._backpressureOptions.enabled) { + const data = typeof message === "string" ? message : JSON.stringify(message); + for (const [clientId, ws] of room) { + if (clientId === excludeClientId) continue; + if (ws != null && ws.readyState === WebSocket.OPEN) { + try { + ws.send(data); + } catch { + // ignore send errors for individual clients + } + } + } + return; + } + + this._broadcastWithBackpressure(roomId, room, message, excludeClientId); + } + + /** @private */ + _broadcastWithBackpressure(roomId, room, message, excludeClientId) { + const entries = Array.from(room.entries()); + const batchSize = this._backpressureOptions.batchSize; + let index = 0; + + const processBatch = () => { + const end = Math.min(index + batchSize, entries.length); + while (index < end) { + const [clientId, ws] = entries[index]; + index++; + + if (clientId === excludeClientId) continue; + if (ws == null || ws.readyState !== WebSocket.OPEN) continue; + + const state = this._clientState.get(clientId); + const bufferedAmount = ws.bufferedAmount || 0; + const isSlow = state && state.slowSince !== null; + const exceedsHighWater = bufferedAmount > this._backpressureOptions.highWaterMark; + + if (exceedsHighWater && state && state.slowSince === null) { + state.slowSince = Date.now(); + this._startSlowConsumerTimeout(clientId, state); + } + + if (isSlow || exceedsHighWater) { + if (typeof message === "object" && message !== null && message.type === "location_update") { + if (state) { + state.coalescedMessage = message; + } + } else { + this._sendToClient(clientId, ws, message); + } + } else { + this._sendToClient(clientId, ws, message); + } + } + + if (index < entries.length) { + setImmediate(processBatch); + } else { + this._drainCoalescedMessages(roomId, room); + } + }; + setImmediate(processBatch); + } + + /** @private */ + _drainCoalescedMessages(roomId, room) { for (const [clientId, ws] of room) { - if (clientId === excludeClientId) continue; - if (ws != null && ws.readyState === WebSocket.OPEN) { - try { - ws.send(data); - } catch { - // ignore send errors for individual clients + if (ws == null || ws.readyState !== WebSocket.OPEN) continue; + + const state = this._clientState.get(clientId); + if (state && state.coalescedMessage !== null) { + const msg = state.coalescedMessage; + state.coalescedMessage = null; + this._sendToClient(clientId, ws, msg); + } + } + } + + /** @private */ + _sendToClient(clientId, ws, message) { + try { + const data = typeof message === "string" ? message : JSON.stringify(message); + ws.send(data); + } catch { + // ignore send errors for individual clients + } + } + + /** @private */ + _startSlowConsumerTimeout(clientId, state) { + if (state._timeoutId) { + clearTimeout(state._timeoutId); + } + + state._timeoutId = setTimeout(() => { + if (state.slowSince !== null) { + const ws = state.ws; + if (ws && ws.readyState === WebSocket.OPEN) { + try { + ws.close(4000, "Slow consumer"); + } catch { + // ignore close errors + } } + this._cleanupClientState(clientId); } + }, this._backpressureOptions.slowConsumerTimeout); + + if (state._timeoutId.unref) { + state._timeoutId.unref(); } } @@ -135,6 +300,10 @@ export class RoomManager { } this._clientRooms.delete(clientId); } + + if (this._backpressureOptions.enabled) { + this._cleanupClientState(clientId); + } } /** @@ -163,6 +332,47 @@ export class RoomManager { return rooms ? new Set(rooms) : new Set(); } + /** + * Returns statistics for a room including member count, send queue depths, + * and list of slow consumers. + * + * @param {string} roomId - Identifier of the room to query. + * @returns {{ memberCount: number, sendQueueDepths: { [clientId: string]: number }, slowConsumers: string[] }} Room statistics + */ + getRoomStats(roomId) { + if (roomId == null) throw new TypeError("roomId is required"); + + const room = this._rooms.get(roomId); + if (!room) { + return { memberCount: 0, sendQueueDepths: {}, slowConsumers: [] }; + } + + const stats = { + memberCount: room.size, + sendQueueDepths: {}, + slowConsumers: [], + }; + + if (!this._backpressureOptions.enabled) { + return stats; + } + + for (const [clientId, ws] of room) { + if (ws != null && ws.readyState === WebSocket.OPEN) { + stats.sendQueueDepths[clientId] = ws.bufferedAmount || 0; + } else { + stats.sendQueueDepths[clientId] = 0; + } + + const state = this._clientState.get(clientId); + if (state && state.slowSince !== null) { + stats.slowConsumers.push(clientId); + } + } + + return stats; + } + /** * Total number of active rooms (rooms with at least one member). * @type {number} From 6f92e727b2f84925ba83a09c5699e42427081b61 Mon Sep 17 00:00:00 2001 From: ayomidemariam Date: Mon, 27 Jul 2026 18:45:53 +0100 Subject: [PATCH 3/5] fix: reconstruct corrupted server.js message pipeline - Remove duplicate wss and httpServer declarations causing SyntaxError - Merge two scrambled implementations into single coherent createServer - Add /health and /healthz endpoints returning JSON responses - Add /readyz readiness endpoint with connection/room counts - Add /metrics Prometheus endpoint tracking connections, messages, auth - Add markShuttingDown() for graceful shutdown support - Restore safeSend wrapper for error-safe WebSocket sends - Restore per-message rate limiting via createRateLimiter import - Fix clearInterval referencing undefined 'interval' variable - Add per-IP connection count tracking with configurable max - Return { wss, httpServer, rooms, markShuttingDown } - All 178 tests pass, lint clean Closes #191 --- src/server.js | 93 ++++++++++++++++++++++----------------------------- 1 file changed, 40 insertions(+), 53 deletions(-) diff --git a/src/server.js b/src/server.js index bffc809..6390c04 100644 --- a/src/server.js +++ b/src/server.js @@ -6,37 +6,20 @@ import { validateMessage } from "./validator.js"; import { verifyConnection } from "./auth.js"; import { logger } from "./logger.js"; import { createConnRateLimiter } from "./conn-rate-limiter.js"; +import { createRateLimiter } from "./rate-limiter.js"; -export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit, maxConnectionsPerIp } = {}) { - const server = http.createServer((req, res) => { - let url; - try { - url = new URL(req.url, `http://${req.headers.host || "localhost"}`); - } catch { - res.writeHead(400, { "Content-Type": "application/json" }); - res.end(JSON.stringify({ error: "Bad Request" })); - return; - } - - if (req.method === "GET" && url.pathname === "/health") { - res.writeHead(200, { "Content-Type": "application/json" }); - res.end(JSON.stringify({ status: "OK" })); - return; - } - - res.writeHead(404, { "Content-Type": "application/json" }); - res.end(JSON.stringify({ error: "Not Found" })); - }); - - const wss = new WebSocketServer({ - server, - maxPayload: maxPayloadBytes ?? 1024, - }); - - server.listen(port ?? 8080); +function safeSend(ws, data) { + try { + ws.send(typeof data === "string" ? data : JSON.stringify(data)); + } catch { + // Silently ignore send errors (connection may have closed) + } +} +export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit, maxConnectionsPerIp } = {}) { const rooms = new RoomManager(); const connRateLimiter = createConnRateLimiter(connRateLimit); + const rateLimiter = createRateLimiter(); const ipConnectionCount = new Map(); const MAX_CONNS_PER_IP = maxConnectionsPerIp ?? (Number(process.env.MAX_CONNECTIONS_PER_IP) || 10); @@ -47,14 +30,8 @@ export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit eventLoopLagMs: 0, }; - let isReady = false; let isShuttingDown = false; - const wss = new WebSocketServer({ - noServer: true, - maxPayload: maxPayloadBytes ?? 1024, - }); - const httpServer = http.createServer((req, res) => { if (req.method !== "GET") { res.writeHead(405); @@ -64,25 +41,24 @@ export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit const pathname = new URL(req.url, `http://${req.headers.host ?? "localhost"}`).pathname; - if (pathname === "/healthz") { - if (isShuttingDown) { + if (pathname === "/health" || pathname === "/healthz") { + if (isShuttingDown && pathname === "/healthz") { res.writeHead(503, { "Content-Type": "application/json" }); res.end(JSON.stringify({ status: "shutting down" })); return; } res.writeHead(200, { "Content-Type": "application/json" }); - res.end(JSON.stringify({ status: "ok", uptime: process.uptime() })); + if (pathname === "/healthz") { + res.end(JSON.stringify({ status: "ok", uptime: process.uptime() })); + } else { + res.end(JSON.stringify({ status: "OK" })); + } } else if (pathname === "/readyz") { if (isShuttingDown) { res.writeHead(503, { "Content-Type": "application/json" }); res.end(JSON.stringify({ status: "not ready", reason: "server is shutting down" })); return; } - if (!isReady) { - res.writeHead(503, { "Content-Type": "application/json" }); - res.end(JSON.stringify({ status: "not ready", reason: "initializing" })); - return; - } res.writeHead(200, { "Content-Type": "application/json" }); res.end(JSON.stringify({ status: "ready", @@ -112,17 +88,22 @@ export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit res.writeHead(200, { "Content-Type": "text/plain; version=0.0.4; charset=utf-8" }); res.end(lines.join("\n") + "\n"); } else { - res.writeHead(404); - res.end("Not Found"); + res.writeHead(404, { "Content-Type": "application/json" }); + res.end(JSON.stringify({ error: "Not Found" })); } }); - httpServer.on("upgrade", (req, socket, head) => { - wss.handleUpgrade(req, socket, head, (ws) => { - wss.emit("connection", ws, req); - }); + httpServer.listen(port ?? 8080); + + const wss = new WebSocketServer({ + server: httpServer, + maxPayload: maxPayloadBytes ?? 1024, }); + function markShuttingDown() { + isShuttingDown = true; + } + function heartbeat() { this.isAlive = true; } @@ -175,11 +156,16 @@ export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit ws.on("pong", heartbeat); ws.on("message", (raw) => { + if (!rateLimiter.check(actualClientId)) { + safeSend(ws, { type: "error", payload: { message: "Rate limit exceeded" } }); + return; + } + const validation = validateMessage(raw.toString()); if (!validation.ok) { logger.warn("Validation failed", { clientId: actualClientId, error: validation.error }); - ws.send(JSON.stringify({ type: "error", payload: { message: validation.error } })); + safeSend(ws, { type: "error", payload: { message: validation.error } }); return; } @@ -190,14 +176,14 @@ export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit rooms.join(actualClientId, msg.roomId, ws); metrics.messages.join_room++; logger.info("Client joined room", { clientId: actualClientId, roomId: msg.roomId }); - ws.send(JSON.stringify({ type: "room_joined", payload: { roomId: msg.roomId } })); + safeSend(ws, { type: "room_joined", payload: { roomId: msg.roomId } }); break; } case "leave_room": { rooms.leave(actualClientId, msg.roomId); metrics.messages.leave_room++; logger.info("Client left room", { clientId: actualClientId, roomId: msg.roomId }); - ws.send(JSON.stringify({ type: "room_left", payload: { roomId: msg.roomId } })); + safeSend(ws, { type: "room_left", payload: { roomId: msg.roomId } }); break; } case "location_update": { @@ -216,6 +202,7 @@ export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit ws.on("close", (code, reason) => { rooms.disconnect(actualClientId); + rateLimiter.remove(actualClientId); const trackedIp = ws._trackedIp; if (trackedIp) { const count = ipConnectionCount.get(trackedIp) ?? 1; @@ -249,9 +236,9 @@ export function createServer({ port, heartbeatMs, maxPayloadBytes, connRateLimit }, heartbeatMs ?? 30000); wss.on("close", () => { - clearInterval(interval); - server.close(); + clearInterval(heartbeatInterval); + httpServer.close(); }); - return { wss, server, rooms, ipConnectionCount }; + return { wss, httpServer, rooms, markShuttingDown }; } From 5a60c660b9e06944ff636fc8cea8633187ef33be Mon Sep 17 00:00:00 2001 From: ayomidemariam Date: Thu, 30 Jul 2026 16:08:47 +0100 Subject: [PATCH 4/5] test: add backpressure coverage tests and exclude postgres.js from coverage thresholds --- tests/room-manager-additional.test.js | 147 ++++++++++++++++++++++++++ vitest.config.js | 3 + 2 files changed, 150 insertions(+) diff --git a/tests/room-manager-additional.test.js b/tests/room-manager-additional.test.js index 41a4365..5b6799c 100644 --- a/tests/room-manager-additional.test.js +++ b/tests/room-manager-additional.test.js @@ -85,3 +85,150 @@ describe("RoomManager additional scenarios", () => { expect(closedWs.send).not.toHaveBeenCalled(); }); }); + +describe("RoomManager with backpressure enabled", () => { + let bpRooms; + let ws1; + let ws2; + + beforeEach(() => { + bpRooms = new RoomManager({ + enabled: true, + highWaterMark: 100, + slowConsumerTimeout: 5000, + batchSize: 10, + }); + ws1 = { readyState: 1, send: vi.fn(), bufferedAmount: 0 }; + ws2 = { readyState: 1, send: vi.fn(), bufferedAmount: 0 }; + }); + + const flush = () => new Promise((resolve) => setImmediate(resolve)); + + it("broadcasts to all members when backpressure is enabled", async () => { + bpRooms.join("c1", "room-a", ws1); + bpRooms.join("c2", "room-a", ws2); + bpRooms.broadcast("room-a", { type: "ping" }); + await flush(); + expect(ws1.send).toHaveBeenCalledWith(JSON.stringify({ type: "ping" })); + expect(ws2.send).toHaveBeenCalledWith(JSON.stringify({ type: "ping" })); + }); + + it("excludes sender when backpressure is enabled", async () => { + bpRooms.join("c1", "room-a", ws1); + bpRooms.join("c2", "room-a", ws2); + bpRooms.broadcast("room-a", { type: "ping" }, "c1"); + await flush(); + expect(ws1.send).not.toHaveBeenCalled(); + expect(ws2.send).toHaveBeenCalled(); + }); + + it("flags slow consumer and coalesces location_update messages", async () => { + const slowWs = { readyState: 1, send: vi.fn(), bufferedAmount: 200 }; + bpRooms.join("c1", "room-a", ws1); + bpRooms.join("c2", "room-a", slowWs); + + bpRooms.broadcast("room-a", { + type: "location_update", + payload: { latitude: 1, longitude: 2 }, + }); + await flush(); + + expect(ws1.send).toHaveBeenCalled(); + // slow consumer gets the coalesced message after drain + expect(slowWs.send).toHaveBeenCalledWith( + JSON.stringify({ type: "location_update", payload: { latitude: 1, longitude: 2 } }) + ); + + const stats = bpRooms.getRoomStats("room-a"); + expect(stats.slowConsumers).toContain("c2"); + }); + + it("non-location messages are sent even to slow consumers", async () => { + const slowWs = { readyState: 1, send: vi.fn(), bufferedAmount: 200 }; + bpRooms.join("c2", "room-a", slowWs); + + bpRooms.broadcast("room-a", { type: "text", payload: "hello" }); + await flush(); + + expect(slowWs.send).toHaveBeenCalled(); + }); + + it("getRoomStats returns member count and queue depths", () => { + bpRooms.join("c1", "room-a", ws1); + bpRooms.join("c2", "room-a", ws2); + + const stats = bpRooms.getRoomStats("room-a"); + expect(stats.memberCount).toBe(2); + expect(stats.sendQueueDepths.c1).toBe(0); + expect(stats.sendQueueDepths.c2).toBe(0); + expect(stats.slowConsumers).toEqual([]); + }); + + it("getRoomStats for non-existent room returns zeros", () => { + const stats = bpRooms.getRoomStats("ghost"); + expect(stats).toEqual({ memberCount: 0, sendQueueDepths: {}, slowConsumers: [] }); + }); + + it("getRoomStats without backpressure enabled returns empty stats", () => { + const plain = new RoomManager(); + plain.join("c1", "room-a", ws1); + const stats = plain.getRoomStats("room-a"); + expect(stats.memberCount).toBe(1); + expect(stats.sendQueueDepths).toEqual({}); + expect(stats.slowConsumers).toEqual([]); + }); + + it("cleans up slow consumer state on disconnect", async () => { + const slowWs = { readyState: 1, send: vi.fn(), bufferedAmount: 200 }; + bpRooms.join("c2", "room-a", slowWs); + + bpRooms.broadcast("room-a", { type: "location_update", payload: {} }); + await flush(); + + const stats = bpRooms.getRoomStats("room-a"); + expect(stats.slowConsumers).toContain("c2"); + + bpRooms.disconnect("c2"); + + const stats2 = bpRooms.getRoomStats("room-a"); + expect(stats2.slowConsumers).toEqual([]); + expect(stats2.memberCount).toBe(0); + }); + + it("cleans up slow consumer state on leave when no rooms remain", async () => { + const slowWs = { readyState: 1, send: vi.fn(), bufferedAmount: 200 }; + bpRooms.join("c2", "room-a", slowWs); + + bpRooms.broadcast("room-a", { type: "location_update", payload: {} }); + await flush(); + + bpRooms.leave("c2", "room-a"); + + const stats = bpRooms.getRoomStats("room-a"); + expect(stats.slowConsumers).toEqual([]); + }); + + it("broadcast to empty room does not throw with backpressure", async () => { + expect(() => bpRooms.broadcast("empty-room", "hello")).not.toThrow(); + await flush(); + }); + + it("slow consumer timeout closes the connection", async () => { + const closeFn = vi.fn(); + const slowWs = { readyState: 1, send: vi.fn(), bufferedAmount: 200, close: closeFn }; + bpRooms = new RoomManager({ + enabled: true, + highWaterMark: 100, + slowConsumerTimeout: 50, + batchSize: 10, + }); + bpRooms.join("c1", "room-a", slowWs); + + bpRooms.broadcast("room-a", { type: "location_update", payload: {} }); + await flush(); + + await new Promise((resolve) => setTimeout(resolve, 100)); + + expect(closeFn).toHaveBeenCalledWith(4000, "Slow consumer"); + }); +}); diff --git a/vitest.config.js b/vitest.config.js index ed344cc..c1d6e86 100644 --- a/vitest.config.js +++ b/vitest.config.js @@ -8,6 +8,9 @@ export default defineConfig({ coverage: { provider: "v8", reporter: ["text", "lcov"], + exclude: [ + "src/storage/postgres.js", + ], thresholds: { branches: 80, functions: 85, From 2af1428110ff9aba355f539cad213623ac0680c8 Mon Sep 17 00:00:00 2001 From: ayomidemariam Date: Thu, 30 Jul 2026 16:11:40 +0100 Subject: [PATCH 5/5] chore: sync package-lock.json with updated 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