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"localhost", "2181", "|", "grep", "imok" ] interval: 10s timeout: 5s retries: 5 @@ -61,7 +61,7 @@ services: zookeeper: condition: service_healthy healthcheck: - test: ["CMD", "nc", "-z", "localhost", "9092"] + test: [ "CMD", "nc", "-z", "localhost", "9092" ] interval: 10s timeout: 5s retries: 10 From 1808d122f226eb26547576b6bf72a30c0e55b334 Mon Sep 17 00:00:00 2001 From: Muhammad Fahim Tajwar Date: Fri, 18 Oct 2024 23:01:46 +0800 Subject: [PATCH 02/10] Change matching service into a websocket server. --- backend/matching-service/index.js | 48 +++++++++++++++++++------------ 1 file changed, 29 insertions(+), 19 deletions(-) diff --git a/backend/matching-service/index.js b/backend/matching-service/index.js index f0357fb44c..4dd0d47286 100644 --- a/backend/matching-service/index.js +++ b/backend/matching-service/index.js @@ -1,25 +1,35 @@ -// index.js -const express = require('express'); -const kafkaRoutes = require('./routes/matchingRoutes'); -const { produceStartupMessage, runConsumer } = require('./controllers/matchingController'); +const WebSocket = require("ws"); -// Create an Express app -const app = express(); -const port = process.env.PORT || 3002; +const wss = new WebSocket.Server({port: 3002}); +const { matchmakeUser, runConsumer} = require("./controllers/matchingController"); -// Middleware to parse JSON bodies -app.use(express.json()); +console.log("Started Websocket server!!!"); -// Use the Kafka routes -app.use('/matching', kafkaRoutes); +runConsumer().catch(console.error); -// Start the Express server and Kafka consumer -app.listen(port, async () => { - console.log(`Matching service running on port ${port}`); +wss.on("connection", (ws) => { + console.log("New Client Connected"); + ws.send("Welcome to websocket server"); - // Produce a message on startup - await produceStartupMessage(); + ws.on('message', async (msg) => { + // console.log(`Received message: ${msg}`); + msg = JSON.parse(msg) + if (msg.event == "enqueue") { + let res; + // console.log(`User ${msg.userId} has been enqueued.`) + try { + res = await matchmakeUser(msg.userId, msg.questions) + } catch (failure) { + res = failure + } + ws.send(res) + ws.close() + } else if (msg.event == "dequeue") { + console.log("User has been dequeued") + } + }); - // Start consuming messages - runConsumer().catch(console.error); -}); + ws.on("close", () => { + console.log("Client has disconnected") + }); +}) \ No newline at end of file From 21c60026f5e2e4f12bd049a518555d2a8a74babc Mon Sep 17 00:00:00 2001 From: Muhammad Fahim Tajwar Date: Fri, 18 Oct 2024 23:02:13 +0800 Subject: [PATCH 03/10] Add WebSocket dependencies. --- backend/matching-service/package.json | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/backend/matching-service/package.json b/backend/matching-service/package.json index 4bb3c68b82..4646800d69 100644 --- a/backend/matching-service/package.json +++ b/backend/matching-service/package.json @@ -3,14 +3,19 @@ "version": "1.0.0", "main": "index.js", "scripts": { - "test": "echo \"Error: no test specified\" && exit 1" + "test": "echo \"Error: no test specified\" && exit 1", + "dev": "nodemon index.js" }, "dependencies": { "express": "^4.18.2", - "kafkajs": "^2.0.0" + "kafkajs": "^2.0.0", + "ws": "^8.18.0" }, "keywords": [], "author": "", "license": "ISC", - "description": "" -} \ No newline at end of file + "description": "", + "devDependencies": { + "nodemon": "^3.1.7" + } +} From c6cebc58affe047d330fbf90a54377f81c1fa452 Mon Sep 17 00:00:00 2001 From: Muhammad Fahim Tajwar Date: Fri, 18 Oct 2024 23:02:34 +0800 Subject: [PATCH 04/10] Change route for websocket connection to / --- backend/matching-service/routes/matchingRoutes.js | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/backend/matching-service/routes/matchingRoutes.js b/backend/matching-service/routes/matchingRoutes.js index f6ab1a0b0e..562d741ccf 100644 --- a/backend/matching-service/routes/matchingRoutes.js +++ b/backend/matching-service/routes/matchingRoutes.js @@ -5,6 +5,6 @@ const { produceMessage } = require('../controllers/matchingController'); const router = express.Router(); // Route for producing a message to Kafka -router.post('/produce', produceMessage); +router.post('/', produceMessage); module.exports = router; From 4f70bb0422dd8edda21463fc91e75e0460e18554 Mon Sep 17 00:00:00 2001 From: Muhammad Fahim Tajwar Date: Fri, 18 Oct 2024 23:03:00 +0800 Subject: [PATCH 05/10] Define logic for handling matchmaking + matchmaking algo. --- .../controllers/matchingController.js | 140 +++++++++++++++--- 1 file changed, 117 insertions(+), 23 deletions(-) diff --git a/backend/matching-service/controllers/matchingController.js b/backend/matching-service/controllers/matchingController.js index d66cf42841..a02097ab86 100644 --- a/backend/matching-service/controllers/matchingController.js +++ b/backend/matching-service/controllers/matchingController.js @@ -1,5 +1,8 @@ // controllers/matchingController.js const { Kafka } = require('kafkajs'); +const EventEmitter = require('events'); +const QUEUE_TIME = 10000; +const BATCH_INTERVAL = 10000; // Kafka setup const kafka = new Kafka({ @@ -7,55 +10,147 @@ const kafka = new Kafka({ brokers: ['kafka:9092'], // 'kafka' is the service name from docker-compose }); +process.on('SIGTERM', async () => { + console.log('Shutting down...'); + await producer.disconnect(); + await consumer.disconnect(); + process.exit(0); + }); + const producer = kafka.producer(); const consumer = kafka.consumer({ groupId: 'matching-group' }); -// Produce a message to Kafka (used in the POST /produce route) -const produceMessage = async (req, res) => { - const { message } = req.body; +(async () => { try { await producer.connect(); - await producer.send({ - topic: 'test-topic', - messages: [{ value: message }], + await consumer.connect(); + } catch(error) { + console.error(error) + } +})(); + +const eventEmitter = new EventEmitter(); + +const matchmakeUser = async (userId, questions) => { + return new Promise((resolve, reject) => { + produceMessage({ + userId: userId, + questions: questions + }, false); + eventEmitter.once(`success-${userId}`, (peerUserId) => { + resolve(`User ${userId} matched with User ${peerUserId}.`) + }); + eventEmitter.once(`dequeue-${userId}`, () => { + resolve(`User ${userId} dequeued from matchmaking.`) + }) + setTimeout(() => { + reject(`No matches for ${userId}.`) + }, QUEUE_TIME); + }) +} + +// Produce a message to Kafka (used in the POST /produce route) +const produceMessage = async (request, isRequeue = false) => { + const msg = { + userId: request.userId, + questions: request.questions, + enqueueTime: isRequeue ? request.enqueueTime : Date.now() + } + const stringifiedMsg = JSON.stringify(msg) + const message = { + topic: 'test-topic', + messages: [ + {value: stringifiedMsg} + ], + } + try { + // await producer.connect(); + await producer.send(message).then(() => { + console.log(`Enqueued message: ${stringifiedMsg}`) }); - await producer.disconnect(); - res.status(200).send(`Message produced: ${message}`); + // await producer.disconnect(); } catch (error) { console.error('Error producing message:', error); - res.status(500).send('Failed to produce message'); } }; // Produce a startup message when the service starts const produceStartupMessage = async () => { try { - await producer.connect(); + // await producer.connect(); const message = 'Hello from producer'; - await producer.send({ - topic: 'test-topic', - messages: [{ value: message }], - }); + // await producer.send({ + // topic: 'test-topic', + // messages: [{ value: message }], + // }); console.log(`Produced startup message: ${message}`); - await producer.disconnect(); + // await producer.disconnect(); } catch (error) { console.error('Error producing startup message:', error); } }; +let batch = []; +const batchProcess = () => { + if (batch.length == 0) { + console.log("No messages to process in this batch cycle."); + return; + } + batch.sort((A, B) => A.questions.length - B.questions.length); + console.log(`sorted batch is`, batch); + let questionDict = new Map(); + let unmatchedUsers = new Map(); + batch.forEach((user) => { + unmatchedUsers.set(user.userId, user); + }); + for (const user of batch) { + if (Date.now() - user.enqueueTime >= QUEUE_TIME) { + // User has timed out. + // TODO: send timeout event emitter. + unmatchedUsers.delete(user.userId); + continue; + } + if (!unmatchedUsers.has(user.userId)) { + // User has already been matched. + continue; + } + + user.questions.forEach((question) => { + const peerUserId = questionDict.get(question); + // Note: UserId cannot be 0, + // since 0 is falsy and would break this if-conditional. + if (peerUserId && unmatchedUsers.has(peerUserId)) { + // Found match!! + eventEmitter.emit(`success-${user.userId}`, peerUserId) + eventEmitter.emit(`success-${peerUserId}`, user.userId) + unmatchedUsers.delete(user.userId); + unmatchedUsers.delete(peerUserId); + } else { + // Else, keep looking + questionDict.set(question, user.userId) + } + }) + } + for (const [key, user] of unmatchedUsers) { + produceMessage(user, true) + console.log(`User ${key} returned to queue.`) + } + batch = []; +}; + // Start consuming messages from Kafka const runConsumer = async () => { try { - await consumer.connect(); + // await consumer.connect(); + // await consumer.subscribe({ topic: 'test-topic', fromBeginning: true }); await consumer.subscribe({ topic: 'test-topic', fromBeginning: true }); + setInterval(batchProcess, BATCH_INTERVAL); + await consumer.run({ eachMessage: async ({ topic, partition, message }) => { - console.log({ - partition, - offset: message.offset, - value: message.value.toString(), - }); + const parsedJsonMsg = JSON.parse(message.value); + batch.push(parsedJsonMsg); }, }); } catch (error) { @@ -64,7 +159,6 @@ const runConsumer = async () => { }; module.exports = { - produceMessage, - produceStartupMessage, runConsumer, + matchmakeUser }; From 83175492fe6ef528f66f88dd1a4623857fff419a Mon Sep 17 00:00:00 2001 From: Muhammad Fahim Tajwar Date: Sun, 20 Oct 2024 17:48:21 +0800 Subject: [PATCH 06/10] Change queue time to 30s, batch accumulation time to 10s. --- backend/matching-service/controllers/matchingController.js | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/backend/matching-service/controllers/matchingController.js b/backend/matching-service/controllers/matchingController.js index a02097ab86..84101d09fe 100644 --- a/backend/matching-service/controllers/matchingController.js +++ b/backend/matching-service/controllers/matchingController.js @@ -1,7 +1,7 @@ // controllers/matchingController.js const { Kafka } = require('kafkajs'); const EventEmitter = require('events'); -const QUEUE_TIME = 10000; +const QUEUE_TIME = 30000; const BATCH_INTERVAL = 10000; // Kafka setup From 442975a55ea5157bf051652e24e37e8581ec7df7 Mon Sep 17 00:00:00 2001 From: Muhammad Fahim Tajwar Date: Sun, 20 Oct 2024 17:49:07 +0800 Subject: [PATCH 07/10] Add dequeue logic. --- .../controllers/matchingController.js | 49 ++++++++++++------- 1 file changed, 31 insertions(+), 18 deletions(-) diff --git a/backend/matching-service/controllers/matchingController.js b/backend/matching-service/controllers/matchingController.js index 84101d09fe..a2ae71220f 100644 --- a/backend/matching-service/controllers/matchingController.js +++ b/backend/matching-service/controllers/matchingController.js @@ -30,6 +30,7 @@ const consumer = kafka.consumer({ groupId: 'matching-group' }); })(); const eventEmitter = new EventEmitter(); +let dequeued = new Map(); const matchmakeUser = async (userId, questions) => { return new Promise((resolve, reject) => { @@ -37,14 +38,32 @@ const matchmakeUser = async (userId, questions) => { userId: userId, questions: questions }, false); - eventEmitter.once(`success-${userId}`, (peerUserId) => { - resolve(`User ${userId} matched with User ${peerUserId}.`) + eventEmitter.once(`success-${userId}`, (peerUserId, question) => { + const res = { + event: "match-success", + userId: userId, + peerUserId: peerUserId, + agreedQuestion: question + } + resolve(JSON.stringify(res)); + // resolve(`User ${userId} matched with User ${peerUserId}.`) }); eventEmitter.once(`dequeue-${userId}`, () => { - resolve(`User ${userId} dequeued from matchmaking.`) + dequeued.set(userId, True); + const res = { + event: "dequeued-success", + userId: userId + } + resolve(JSON.stringify(res)); + // resolve(`User ${userId} dequeued from matchmaking.`) }) setTimeout(() => { - reject(`No matches for ${userId}.`) + const rejectionMsg = { + event: "match-timeout", + userId: userId + }; + reject(JSON.stringify(rejectionMsg)); + // reject(`No matches for ${userId}.`) }, QUEUE_TIME); }) } @@ -64,11 +83,9 @@ const produceMessage = async (request, isRequeue = false) => { ], } try { - // await producer.connect(); await producer.send(message).then(() => { console.log(`Enqueued message: ${stringifiedMsg}`) }); - // await producer.disconnect(); } catch (error) { console.error('Error producing message:', error); } @@ -77,20 +94,15 @@ const produceMessage = async (request, isRequeue = false) => { // Produce a startup message when the service starts const produceStartupMessage = async () => { try { - // await producer.connect(); const message = 'Hello from producer'; - // await producer.send({ - // topic: 'test-topic', - // messages: [{ value: message }], - // }); console.log(`Produced startup message: ${message}`); - // await producer.disconnect(); } catch (error) { console.error('Error producing startup message:', error); } }; let batch = []; + const batchProcess = () => { if (batch.length == 0) { console.log("No messages to process in this batch cycle."); @@ -101,7 +113,9 @@ const batchProcess = () => { let questionDict = new Map(); let unmatchedUsers = new Map(); batch.forEach((user) => { - unmatchedUsers.set(user.userId, user); + if (!dequeued.has(user.userId)) { + unmatchedUsers.set(user.userId, user); + } }); for (const user of batch) { if (Date.now() - user.enqueueTime >= QUEUE_TIME) { @@ -111,7 +125,7 @@ const batchProcess = () => { continue; } if (!unmatchedUsers.has(user.userId)) { - // User has already been matched. + // User has already been matched/dequeued. continue; } @@ -121,8 +135,8 @@ const batchProcess = () => { // since 0 is falsy and would break this if-conditional. if (peerUserId && unmatchedUsers.has(peerUserId)) { // Found match!! - eventEmitter.emit(`success-${user.userId}`, peerUserId) - eventEmitter.emit(`success-${peerUserId}`, user.userId) + eventEmitter.emit(`success-${user.userId}`, peerUserId, question) + eventEmitter.emit(`success-${peerUserId}`, user.userId, question) unmatchedUsers.delete(user.userId); unmatchedUsers.delete(peerUserId); } else { @@ -136,13 +150,12 @@ const batchProcess = () => { console.log(`User ${key} returned to queue.`) } batch = []; + dequeued.clear(); }; // Start consuming messages from Kafka const runConsumer = async () => { try { - // await consumer.connect(); - // await consumer.subscribe({ topic: 'test-topic', fromBeginning: true }); await consumer.subscribe({ topic: 'test-topic', fromBeginning: true }); setInterval(batchProcess, BATCH_INTERVAL); From 8656dd589bca1dc8deeda1966369221a85a85755 Mon Sep 17 00:00:00 2001 From: Muhammad Fahim Tajwar Date: Sun, 20 Oct 2024 17:56:09 +0800 Subject: [PATCH 08/10] Remove leftover route definition code from Express webserver. --- backend/matching-service/routes/matchingRoutes.js | 10 ---------- 1 file changed, 10 deletions(-) diff --git a/backend/matching-service/routes/matchingRoutes.js b/backend/matching-service/routes/matchingRoutes.js index 562d741ccf..e69de29bb2 100644 --- a/backend/matching-service/routes/matchingRoutes.js +++ b/backend/matching-service/routes/matchingRoutes.js @@ -1,10 +0,0 @@ -// routes/matchingRoutes.js -const express = require('express'); -const { produceMessage } = require('../controllers/matchingController'); - -const router = express.Router(); - -// Route for producing a message to Kafka -router.post('/', produceMessage); - -module.exports = router; From ab01b31e046703e77e829d5b11f0202187ba3fdd Mon Sep 17 00:00:00 2001 From: Muhammad Fahim Tajwar Date: Sun, 20 Oct 2024 18:26:15 +0800 Subject: [PATCH 09/10] Add separate function for dequeuing a userId. --- .../matching-service/controllers/matchingController.js | 9 +++++++-- backend/matching-service/index.js | 6 +++--- 2 files changed, 10 insertions(+), 5 deletions(-) diff --git a/backend/matching-service/controllers/matchingController.js b/backend/matching-service/controllers/matchingController.js index a2ae71220f..dfd79b485e 100644 --- a/backend/matching-service/controllers/matchingController.js +++ b/backend/matching-service/controllers/matchingController.js @@ -49,7 +49,7 @@ const matchmakeUser = async (userId, questions) => { // resolve(`User ${userId} matched with User ${peerUserId}.`) }); eventEmitter.once(`dequeue-${userId}`, () => { - dequeued.set(userId, True); + dequeued.set(userId, true); const res = { event: "dequeued-success", userId: userId @@ -68,6 +68,10 @@ const matchmakeUser = async (userId, questions) => { }) } +const dequeueUser = async (userId) => { + eventEmitter.emit(`dequeue-${userId}`); +} + // Produce a message to Kafka (used in the POST /produce route) const produceMessage = async (request, isRequeue = false) => { const msg = { @@ -173,5 +177,6 @@ const runConsumer = async () => { module.exports = { runConsumer, - matchmakeUser + matchmakeUser, + dequeueUser }; diff --git a/backend/matching-service/index.js b/backend/matching-service/index.js index 4dd0d47286..d371d8e3d1 100644 --- a/backend/matching-service/index.js +++ b/backend/matching-service/index.js @@ -1,7 +1,7 @@ const WebSocket = require("ws"); const wss = new WebSocket.Server({port: 3002}); -const { matchmakeUser, runConsumer} = require("./controllers/matchingController"); +const { matchmakeUser, runConsumer, dequeueUser} = require("./controllers/matchingController"); console.log("Started Websocket server!!!"); @@ -12,11 +12,9 @@ wss.on("connection", (ws) => { ws.send("Welcome to websocket server"); ws.on('message', async (msg) => { - // console.log(`Received message: ${msg}`); msg = JSON.parse(msg) if (msg.event == "enqueue") { let res; - // console.log(`User ${msg.userId} has been enqueued.`) try { res = await matchmakeUser(msg.userId, msg.questions) } catch (failure) { @@ -25,6 +23,8 @@ wss.on("connection", (ws) => { ws.send(res) ws.close() } else if (msg.event == "dequeue") { + dequeueUser(msg.userId); + ws.close(); console.log("User has been dequeued") } }); From d95ecd37ddd1c01664b96b48f5abee0f41800e35 Mon Sep 17 00:00:00 2001 From: Muhammad Fahim Tajwar <86123134+fahim-tazz@users.noreply.github.com> Date: Sun, 20 Oct 2024 18:56:29 +0800 Subject: [PATCH 10/10] Update README.md Add matching service route and message formats --- README.md | 46 ++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 44 insertions(+), 2 deletions(-) diff --git a/README.md b/README.md index 7714dff6d0..d59a2c817c 100644 --- a/README.md +++ b/README.md @@ -4,6 +4,7 @@ ### API Endpoints +#### Question Service The question microservice exposes the following API endpoints: - ```questions/all``` - Returns all the questions available on the database. - ```questions/byId/[Question ID]``` - Returns a single question by ID number. @@ -13,8 +14,49 @@ The question microservice exposes the following API endpoints: - ```questions/delete/[Question ID]``` - Deletes a question from the database by ID number. - ```questions/update/[Question ID]``` - Updates a question from the database by ID number. - ```questions/patch/[Question ID]``` - Patches a question from the database by ID number. -The matching microservice exposes the following API endpoints: -- ```matching/produce``` - Produce a message to Kafka. + +#### Matching Service +The matching microservice exposes the following API endpoint (via a WebSocket connection): +- ```/``` - Persistently opens a connection to the service. + +Message Protocol (JSON): + +**Note**: WebSocket only sends strings, so use ```JSON.stringify()``` to convert your JS request objects into strings (and ```JSON.parse()``` to parse responses) when communicating via WebSocket.
+ +1. To enqueue a user: +``` +{ + event: "enqueue", + userId: , + questions: [] +} +``` +Replies with: + +- On successful match within 30s: +``` +{ + event: "match-success", + userId: , + peerUserId: , + agreedQuestion: +} +``` +- On timeout after 30s (no match found): +``` +{ + event: "match-timeout", + userId: +} +``` +2. To dequeue a user: +- Replies with an ```dequeue-success``` event. +``` +{ + "event": "dequeue", + "userId": , +} +``` ### Running PeerPrep In the root directory, run