From 45d6eb5e8a069019e6087f2d36027295a73ee586 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EC=8B=AC=EC=9E=AC=EC=97=BD?= <jysim0326@ajou.ac.kr>
Date: Sun, 8 Dec 2024 15:56:04 +0900
Subject: [PATCH] =?UTF-8?q?refactor:=20=EC=A4=91=EB=B3=B5=20=EC=BD=94?=
=?UTF-8?q?=EB=93=9C=20=ED=86=B5=ED=95=A9,=20rabbitmq=20=EC=97=B0=EA=B2=B0?=
=?UTF-8?q?=20=EC=9C=A0=EC=A7=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
---
wsServer.js | 651 ++++++++++++++++++++++++++++++++--------------------
1 file changed, 401 insertions(+), 250 deletions(-)
diff --git a/wsServer.js b/wsServer.js
index e938ef8..fa69548 100644
--- a/wsServer.js
+++ b/wsServer.js
@@ -5,22 +5,21 @@ const mongoose = require('mongoose');
const admin = require('firebase-admin');
const dotenv = require('dotenv');
const amqp = require('amqplib'); // RabbitMQ 연결
-const ChatRoom = require('./schemas/chatRooms');
+const ChatRoom = require('./schemas/ChatRooms');
// .env 파일 로드
dotenv.config();
-// 서비스 계정 키 파일 경로를 환경 변수에서 가져오기
-const serviceAccountPath = process.env.FIREBASE_CREDENTIAL_PATH;
+const HEARTBEAT_TIMEOUT = 10000; // 10초 후 타임아웃
-// Firebase Admin SDK 초기화
-admin.initializeApp({
- credential: admin.credential.cert(require(serviceAccountPath)),
-});
+// RabbitMQ 연결 풀 생성
+let amqpConnection, amqpChannel;
// WebSocket 관련 데이터
let clients = [];
-let chatRooms = {};
+
+// 클라이언트 상태를 저장하는 Map
+const clientHeartbeats = new Map();
// MongoDB 연결 설정
async function connectMongoDB() {
@@ -39,14 +38,35 @@ async function connectMongoDB() {
}
}
-// RabbitMQ 메시지 발행 함수
+// // RabbitMQ 메시지 발행 함수
+// async function publishToQueue(queue, message) {
+// const connection = await amqp.connect(process.env.RABBITMQ_URL || 'amqp://localhost');
+// const channel = await connection.createChannel();
+// await channel.assertQueue(queue, { durable: true });
+// channel.sendToQueue(queue, Buffer.from(JSON.stringify(message)));
+// console.log(`Message sent to queue ${queue}:`, message);
+// setTimeout(() => connection.close(), 500); // 연결 닫기
+// }
+
+async function setupRabbitMQ() {
+ try {
+ amqpConnection = await amqp.connect(process.env.RABBITMQ_URL || 'amqp://localhost');
+ amqpChannel = await amqpConnection.createChannel();
+ console.log('RabbitMQ connection established');
+ } catch (err) {
+ logError('RabbitMQ Setup', err);
+ process.exit(1);
+ }
+}
+
async function publishToQueue(queue, message) {
- const connection = await amqp.connect(process.env.RABBITMQ_URL || 'amqp://localhost');
- const channel = await connection.createChannel();
- await channel.assertQueue(queue, { durable: true });
- channel.sendToQueue(queue, Buffer.from(JSON.stringify(message)));
- console.log(`Message sent to queue ${queue}:`, message);
- setTimeout(() => connection.close(), 500); // 연결 닫기
+ try {
+ await amqpChannel.assertQueue(queue, { durable: true });
+ amqpChannel.sendToQueue(queue, Buffer.from(JSON.stringify(message)));
+ console.log(`Message sent to queue ${queue}:`, message);
+ } catch (err) {
+ logError('RabbitMQ Publish', err);
+ }
}
// RabbitMQ를 통해 푸시 알림 요청을 전송하는 함수
@@ -67,237 +87,355 @@ async function getChatHistory(chatRoomId) {
return chatRoom ? chatRoom.messages : [];
}
-// WebSocket 서버 생성 및 핸드셰이크 처리
function startWebSocketServer() {
- const wsServer = http.createServer((req, res) => {
+ const server = http.createServer((req, res) => {
res.writeHead(200, { 'Content-Type': 'text/plain' });
res.end('WebSocket server is running');
});
- wsServer.on('upgrade', (req, socket, head) => {
- const key = req.headers['sec-websocket-key'];
- const acceptKey = generateAcceptValue(key);
- const responseHeaders = [
- 'HTTP/1.1 101 Switching Protocols',
- 'Upgrade: websocket',
- 'Connection: Upgrade',
- `Sec-WebSocket-Accept: ${acceptKey}`
- ];
- socket.write(responseHeaders.join('\r\n') + '\r\n\r\n');
-
- // 클라이언트를 clients 배열에 추가
- clients.push(socket);
-
- let chatRoomId = null;
- let nickname = null;
-
- socket.on('data', async buffer => {
- let message;
- try {
- message = parseMessage(buffer);
- const parsedData = JSON.parse(message);
- const { type, chatRoomId: clientChatRoomId, nickname: clientNickname, text } = parsedData;
-
- console.log('서버에서 수신한 메시지:', { type, clientChatRoomId, clientNickname, text });
-
- if (type === 'join' || type === 'leave') {
- await ChatRoom.updateOne(
- { chatRoomId: clientChatRoomId },
- { $set: { [`isOnline.${clientNickname}`]: type === 'join' } }
- );
-
- const statusMessage = {
- type: 'status',
- chatRoomId: clientChatRoomId,
- nickname: clientNickname,
- isOnline: type === 'join',
- };
-
- clients.forEach(client => {
- client.write(constructReply(JSON.stringify(statusMessage)));
- });
- }
-
- if (type === 'join') {
- chatRoomId = clientChatRoomId;
- nickname = clientNickname;
-
- await ChatRoom.updateOne(
- { chatRoomId },
- {
- $set: {
- [`isOnline.${nickname}`]: true,
- [`lastReadLogId.${nickname}`]: null,
- },
- }
- );
-
- if (!chatRooms[chatRoomId]) {
- chatRooms[chatRoomId] = [];
- }
-
- const chatRoom = await ChatRoom.findOne({ chatRoomId });
-
- // 참가자 확인
- const participantIndex = chatRoom.participants.findIndex(participant => participant.name === nickname);
- if (participantIndex !== -1) {
- const existingParticipant = chatRoom.participants[participantIndex];
-
- // 참가자 상태 업데이트
- existingParticipant.isOnline = true;
- existingParticipant.lastReadAt = new Date();
-
- await chatRoom.save();
- } else {
- // 새 참가자 추가
- const joinMessage = {
- message: `${nickname}님이 참가했습니다.`,
- timestamp: new Date(),
- type: 'join'
- };
-
- chatRoom.participants.push({
- name: nickname,
- fcmTokens: parsedData.fcmToken ? [parsedData.fcmToken] : [],
- lastReadAt: new Date(),
- lastReadLogId: null,
- isOnline: true,
- });
-
- chatRoom.messages.push(joinMessage);
-
- await chatRoom.save();
-
- clients.forEach(client => {
- client.write(constructReply(JSON.stringify(joinMessage)));
- });
-
- console.log(`${nickname} 새 참가자로 추가`);
- }
-
- try {
- const previousMessages = await getChatHistory(chatRoomId);
- if (previousMessages.length > 0) {
- socket.write(constructReply(JSON.stringify({ type: 'previousMessages', messages: previousMessages })));
- console.log(`이전 메시지 전송: ${previousMessages.length}개`);
- }
- } catch (err) {
- console.error('이전 채팅 기록 불러오기 중 오류 발생:', err);
- }
-
- } else if (type === 'message') {
- const chatMessage = {
- message: text,
- timestamp: new Date(),
- type: 'message',
- sender: nickname
- };
-
-
- chatRooms[chatRoomId].push(chatMessage);
-
- try {
- // 새로운 메시지를 messages 배열에 추가
- const updatedChatRoom = await ChatRoom.findOneAndUpdate(
- { chatRoomId },
- { $push: { messages: chatMessage } },
- { new: true, fields: { "messages": { $slice: -1 } } } // 마지막 추가된 메시지만 가져옴
- );
-
- // 마지막에 추가된 메시지의 _id를 가져오기
- const savedMessage = updatedChatRoom.messages[updatedChatRoom.messages.length - 1];
-
- // 새로운 메시지 전송: 클라이언트로 메시지 브로드캐스트
- const messageData = {
- type: 'message',
- chatRoomId,
- sender: nickname,
- message: text,
- timestamp: chatMessage.timestamp,
- _id: savedMessage._id // 저장된 메시지의 _id 사용
- };
-
- clients.forEach(client => {
- client.write(constructReply(JSON.stringify(messageData)));
- console.log('채팅 메시지 전송:', messageData);
- });
-
- // 오프라인 사용자에게 FCM 푸시 알림 전송
- const chatRoom = await ChatRoom.findOne({ chatRoomId });
- const offlineParticipants = chatRoom.participants.filter(participant => {
- // isOnline 상태를 Map에서 가져오기
- const isOnline = chatRoom.isOnline.get(participant.name);
- return isOnline === false; // 정확히 false인 사용자만 필터링
- });
-
- console.log("offlineParticipants", offlineParticipants);
-
- // RabbitMQ에 푸시 알림 요청 발행
- await sendPushNotificationRequest(chatRoom.chatRoomName, clientNickname, text, offlineParticipants, chatRoomId);
- } catch (err) {
- console.error('MongoDB 채팅 메시지 저장 오류:', err);
- }
- } else if (type === 'leave') {
- const leaveMessage = {
- message: `${nickname}님이 퇴장했습니다.`,
- timestamp: new Date(),
- type: 'leave'
- };
-
- chatRooms[chatRoomId].push(leaveMessage);
-
- await ChatRoom.updateOne(
- { chatRoomId },
- { $set: { [`isOnline.${nickname}`]: false } }
- );
-
- await ChatRoom.updateOne({ chatRoomId }, {
- $push: { messages: leaveMessage },
- $pull: { participants: nickname }
- });
-
- clients.forEach(client => {
- client.write(constructReply(JSON.stringify(leaveMessage)));
- });
-
- clients = clients.filter(client => client !== socket);
- }
- } catch (err) {
- console.error('메시지 처리 중 오류 발생:', err);
- }
- });
+ server.on('upgrade', (req, socket, head) => {
+ handleWebSocketUpgrade(req, socket);
+ });
- socket.on('close', async () => {
- if (nickname && chatRoomId) {
- await ChatRoom.updateOne(
- { chatRoomId },
- { $set: { [`isOnline.${nickname}`]: false } }
- );
-
- const statusMessage = {
- type: 'status',
- chatRoomId,
- nickname,
- isOnline: false,
- };
-
- clients.forEach(client => {
- client.write(constructReply(JSON.stringify(statusMessage)));
- });
- }
+ server.listen(8081, () => {
+ console.log('WebSocket 채팅 서버가 8081 포트에서 실행 중입니다.');
+ });
+}
+
+function handleWebSocketUpgrade(req, socket) {
+ const key = req.headers['sec-websocket-key'];
+ const acceptKey = generateAcceptValue(key);
+ const responseHeaders = [
+ 'HTTP/1.1 101 Switching Protocols',
+ 'Upgrade: websocket',
+ 'Connection: Upgrade',
+ `Sec-WebSocket-Accept: ${acceptKey}`
+ ];
+
+ socket.write(responseHeaders.join('\r\n') + '\r\n\r\n');
+
+ // 클라이언트를 clients 배열에 추가
+ clients.push(socket);
+
+ socket.on('data', async buffer => {
+ try {
+ message = parseMessage(buffer);
+ if (!message) return; // 메시지가 비어 있는 경우 무시
+
+ const parsedData = JSON.parse(message);
+ const { type, chatRoomId: clientChatRoomId, nickname: clientNickname, text } = parsedData;
+ await handleClientMessage(socket, parsedData);
+ } catch (err) {
+ console.error('Error processing message:', err);
+ }
+ });
+
+ socket.on('close', async () => {
+
+ console.log(`WebSocket 연결이 종료되었습니다: ${socket.nickname}, ${socket.chatRoomId}`);
+
+ // 클라이언트 Heartbeat 맵에서 제거
+ clientHeartbeats.delete(socket);
+
+ // 클라이언트 목록에서 제거
+ clients = clients.filter((client) => client !== socket);
+
+
+ // 소켓 종료 전, 창 닫기 or hidden 때문에 이미 온라인 상태 false로 됨 (중복 로직 주석 처리)
+ // if (socket.nickname && socket.chatRoomId) {
+ // await ChatRoom.updateOne(
+ // { chatRoomId: socket.chatRoomId },
+ // { $set: { [`isOnline.${socket.nickname}`]: false } }
+ // );
+ // }
+ });
+
+ socket.on('error', (err) => {
+ console.error(`WebSocket error: ${err}`);
+ clients = clients.filter((client) => client !== socket);
+ });
+
+}
+
+// 메시지 타입 처리
+async function handleClientMessage(socket, data) {
+ const { type, chatRoomId, nickname, text, fcmToken } = data;
+
+ // 타임아웃된 소켓 차단
+ if (socket.isTimedOut) {
+ console.log(`타임아웃된 클라이언트의 재연결을 차단: ${nickname}`);
+ return;
+ }
+
+ switch (type) {
+ case 'heartbeat':
+ // console.log(`Heartbeat received from ${nickname} in room ${chatRoomId}`);
+ clientHeartbeats.set(socket, Date.now());
+ break;
+ case 'join':
+ // WebSocket에 사용자 정보 저장
+ // socket.nickname = nickname;
+ // socket.chatRoomId = chatRoomId;
+ await handleJoin(socket, chatRoomId, nickname, fcmToken);
+ break;
+ case 'message':
+ await handleMessage(chatRoomId, nickname, text);
+ break;
+ case 'leave':
+ await handleLeave(chatRoomId, nickname);
+ break;
+ case 'notice':
+ await handleSetNotice(chatRoomId, nickname, text);
+ break;
+ default:
+ console.log(`Unknown message type: ${type}`);
+ }
+}
+
+// join - 참가 메시지
+async function handleJoin(socket, chatRoomId, nickname) {
+ if (socket.isTimedOut) {
+ console.log(`타임아웃된 클라이언트의 재참여를 차단: ${nickname}`);
+ return;
+ }
+
+ // Set client properties
+ socket.chatRoomId = chatRoomId;
+ socket.nickname = nickname;
+
+ console.log(`Client joined room: ${chatRoomId}, nickname: ${nickname}`);
+
+ await ChatRoom.updateOne(
+ { chatRoomId: chatRoomId },
+ { $set: { [`isOnline.${nickname}`]:true } }
+ );
+
+ const statusMessage = {
+ type: 'status',
+ chatRoomId: chatRoomId,
+ nickname: nickname,
+ isOnline: true,
+ };
+
+ broadcastMessage(chatRoomId, statusMessage);
+
+ await ChatRoom.updateOne(
+ { chatRoomId },
+ { $set: {
+ [`isOnline.${nickname}`]: true,
+ [`lastReadLogId.${nickname}`]: null,
+ },
+ }
+ );
+
+ const chatRoom = await ChatRoom.findOne({ chatRoomId });
+
+ // 참가자 확인
+ const participantIndex = chatRoom.participants.findIndex(participant => participant.name === nickname);
+
+ if (participantIndex !== -1) {
+ const existingParticipant = chatRoom.participants[participantIndex];
+
+ // 참가자 상태 업데이트
+ existingParticipant.isOnline = true;
+ existingParticipant.lastReadAt = new Date();
+
+ await chatRoom.save();
+ } else {
+ // 새 참가자 추가
+ const joinMessage = {
+ message: `${nickname}님이 참가했습니다.`,
+ timestamp: new Date(),
+ type: 'join'
+ };
+
+ chatRoom.participants.push({
+ name: nickname,
+ fcmTokens: parsedData.fcmToken ? [parsedData.fcmToken] : [],
+ lastReadAt: new Date(),
+ lastReadLogId: null,
+ isOnline: true,
+ });
+
+ chatRoom.messages.push(joinMessage);
+
+ await chatRoom.save();
+
+ broadcastMessage(chatRoomId, joinMessage);
+
+ console.log(`${nickname} 새 참가자로 추가`);
+ }
+
+ const previousMessages = await getChatHistory(chatRoomId);
+ if (previousMessages.length > 0) {
+ socket.write(constructReply(JSON.stringify({ type: 'previousMessages', messages: previousMessages })));
+ }
+}
+
+// meessage - 일반 메시지
+async function handleMessage(chatRoomId, nickname, text) {
+ const chatMessage = { message: text, timestamp: new Date(), type: 'message', sender: nickname };
+
+ try {
+ const updatedChatRoom = await ChatRoom.findOneAndUpdate(
+ { chatRoomId },
+ { $push: { messages: chatMessage } },
+ { new: true, fields: { messages: { $slice: -1 } } }
+ );
+
+ // 마지막에 추가된 메시지의 _id를 가져오기
+ const savedMessage = updatedChatRoom.messages[updatedChatRoom.messages.length - 1];
+
+ // 새로운 메시지 전송: 클라이언트로 메시지 브로드캐스트
+ const messageData = {
+ type: 'message',
+ chatRoomId,
+ sender: nickname,
+ message: text,
+ timestamp: chatMessage.timestamp,
+ _id: savedMessage._id // 저장된 메시지의 _id 사용
+ };
+
+ console.log('채팅에서 Current clients:', clients.map(client => client.chatRoomId));
+
+ // broadcastMessage(chatRoomId, messageData);
+
+ clients.forEach(client => {
+ client.write(constructReply(JSON.stringify(messageData)));
+ console.log('채팅 메시지 전송:', messageData);
});
- socket.on('error', (err) => {
- console.error(`WebSocket error: ${err}`);
- clients = clients.filter(client => client !== socket);
+ // 오프라인 사용자에게 FCM 푸시 알림 전송
+ const chatRoom = await ChatRoom.findOne({ chatRoomId });
+ const offlineParticipants = chatRoom.participants.filter(participant => {
+ // isOnline 상태를 Map에서 가져오기
+ const isOnline = chatRoom.isOnline.get(participant.name);
+ return isOnline === false; // 정확히 false인 사용자만 필터링
});
+
+ console.log("offlineParticipants", offlineParticipants);
+
+ // RabbitMQ에 푸시 알림 요청 발행
+ await sendPushNotificationRequest(chatRoom.chatRoomName, nickname, text, offlineParticipants, chatRoomId);
+
+ } catch (err) {
+ console.error('Error saving message to MongoDB:', err);
+ }
+}
+
+// leave - 퇴장 메시지
+async function handleLeave(chatRoomId, nickname) {
+ await ChatRoom.updateOne(
+ { chatRoomId: clientChatRoomId },
+ { $set: { [`isOnline.${clientNickname}`]: type === 'leave' } }
+ );
+
+ const statusMessage = {
+ type: 'status',
+ chatRoomId: clientChatRoomId,
+ nickname: clientNickname,
+ isOnline: type === 'leave',
+ };
+
+ clients.forEach(client => {
+ client.write(constructReply(JSON.stringify(statusMessage)));
});
- wsServer.listen(8081, () => {
- console.log('WebSocket 채팅 서버가 8081 포트에서 실행 중입니다.');
+ const leaveMessage = { message: `${nickname} 님이 퇴장했습니다.`, timestamp: new Date(), type: 'leave' };
+ await ChatRoom.updateOne({ chatRoomId }, { $push: { messages: leaveMessage } });
+ broadcastMessage(chatRoomId, leaveMessage);
+}
+
+async function handleSetNotice(chatRoomId, sender, message) {
+ const notice = {
+ sender,
+ message,
+ timestamp: new Date(),
+ };
+
+ try {
+ // MongoDB에 최신 공지 저장
+ await ChatRoom.updateOne(
+ { chatRoomId },
+ { $push: { notices: notice } }
+ );
+
+ // 모든 클라이언트에게 공지사항 업데이트 메시지 전송
+ const noticeMessage = {
+ type: 'notice',
+ chatRoomId,
+ sender,
+ message,
+ };
+
+ clients.forEach(client => {
+ client.write(constructReply(JSON.stringify(noticeMessage)));
+ });
+
+ // broadcastMessage(chatRoomId, noticeMessage);
+
+ console.log('공지사항 업데이트:', noticeMessage);
+ } catch (error) {
+ console.error('공지사항 업데이트 실패:', error);
+ }
+}
+
+// Broadcast message to clients in the same chat room
+function broadcastMessage(chatRoomId, message) {
+ clients.forEach((client) => {
+ if (client.chatRoomId === chatRoomId) {
+ client.write(constructReply(JSON.stringify(message)));
+ }
});
}
+// 주기적으로 Heartbeat 상태 확인
+setInterval(async () => {
+ const now = Date.now();
+ for (const [socket, lastHeartbeat] of clientHeartbeats.entries()) {
+ if (now - lastHeartbeat > HEARTBEAT_TIMEOUT) {
+ console.log('타임아웃 대상 클라이언트:', {
+ nickname: socket.nickname,
+ chatRoomId: socket.chatRoomId,
+ lastHeartbeat: new Date(lastHeartbeat).toISOString(),
+ });
+
+ // Heartbeat 맵에서 제거
+ clientHeartbeats.delete(socket);
+
+ // 상태 플래그 설정
+ socket.isTimedOut = true;
+
+ // 소켓 연결 종료
+ socket.end();
+
+ // 클라이언트 목록에서 제거
+ clients = clients.filter((client) => client !== socket);
+
+ // 클라이언트를 오프라인으로 설정
+ console.log("Client timed out 후 오프라인 설정");
+ await ChatRoom.updateOne(
+ { [`isOnline.${socket.nickname}`]: false },
+ { [`lastReadAt.${socket.nickname}`]: new Date() }
+ );
+
+ // 클라이언트에게 연결 종료 메시지 전송
+ const timeoutMessage = JSON.stringify({
+ type: 'status',
+ nickname: socket.nickname,
+ chatRoomId: socket.chatRoomId,
+ isOnline: false,
+ });
+
+ clients.forEach(client => {
+ client.write(constructReply(timeoutMessage));
+ });
+
+
+ }
+ }
+}, 5000); // 5초마다 상태 확인
+
// Sec-WebSocket-Accept 헤더 값 생성 -> env처리
function generateAcceptValue(key) {
return crypto.createHash('sha1').update(key + '258EAFA5-E914-47DA-95CA-C5AB0DC85B11', 'binary').digest('base64');
@@ -305,27 +443,37 @@ function generateAcceptValue(key) {
// WebSocket 메시지 파싱 함수
function parseMessage(buffer) {
- const byteArray = [...buffer];
- const secondByte = byteArray[1];
- let length = secondByte & 127;
- let maskStart = 2;
-
- if (length === 126) {
- length = (byteArray[2] << 8) + byteArray[3];
- maskStart = 4;
- } else if (length === 127) {
- length = 0;
- for (let i = 0; i < 8; i++) {
- length = (length << 8) + byteArray[2 + i];
+ try {
+ const byteArray = [...buffer];
+ const secondByte = byteArray[1];
+ let length = secondByte & 127;
+ let maskStart = 2;
+
+ if (length === 126) {
+ length = (byteArray[2] << 8) + byteArray[3];
+ maskStart = 4;
+ } else if (length === 127) {
+ length = 0;
+ for (let i = 0; i < 8; i++) {
+ length = (length << 8) + byteArray[2 + i];
+ }
+ maskStart = 10;
}
- maskStart = 10;
- }
- const dataStart = maskStart + 4;
- const mask = byteArray.slice(maskStart, dataStart);
- const data = byteArray.slice(dataStart, dataStart + length).map((byte, i) => byte ^ mask[i % 4]);
+ const dataStart = maskStart + 4;
+ const mask = byteArray.slice(maskStart, dataStart);
+ const data = byteArray.slice(dataStart, dataStart + length).map((byte, i) => byte ^ mask[i % 4]);
+
+ const decodedMessage = new TextDecoder('utf-8').decode(Uint8Array.from(data));
+
+ // JSON 유효성 검사
+ JSON.parse(decodedMessage);
- return new TextDecoder('utf-8').decode(Uint8Array.from(data));
+ return decodedMessage;
+ } catch (err) {
+ console.error('Error parsing WebSocket message:', err.message);
+ return null; // 유효하지 않은 메시지는 무시
+ }
}
// 클라이언트 메시지 응답 생성 함수
@@ -353,5 +501,8 @@ function constructReply(message) {
return Buffer.concat([Buffer.from(reply), messageBuffer]);
}
+// 서버 시작 시 RabbitMQ 설정
+setupRabbitMQ();
+
// MongoDB 연결 후 WebSocket 서버 시작
connectMongoDB();
\ No newline at end of file
--
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