wrtc can't create offer in nestjs - nestjs

Question

Newbie is Here!
I am developing media server for sfu.
I want to make sfu media server, so i think it needs RTCPeerconnection like client side.
myProblem is that 'wrtc.RTCPeerConnection.createOffer()' is not work in nestjs
I want to use webrtc api in nestjs like
import * as webrtc from 'wrtc'
const Peer = new webrtc.RTCPeerConnection();
Peer.createOffer();
I want to use methods (createOffer, createAnswer ...etc) and events (onicecandidate, ontrack ...etc)
but it is not working.
It is result of wrtc.RTCPeerConnection().createOffer() in my project
It make "offer" of empty object like this
Promise { <pending> }
in console.log()
there is my code of nestjs
sfu.service.ts
import { Injectable } from '#nestjs/common';
import { Server, Socket } from 'socket.io';
import * as DefaultRTCPeerConnection from 'wrtc';
const {
RTCPeerConnection,
} = DefaultRTCPeerConnection;
#Injectable()
export class SfuService {
private peers: Map<string, RTCPeerConnection>;
private id: string;
constructor() {
this.peers = new Map();
}
getter() {
return this.peers.get(this.id);
}
async createPeerConnection(connectionId) {
const peerConnection = new RTCPeerConnection();
this.peers.set(connectionId, peerConnection);
this.id = connectionId;
// peerConnection.ontrack = (stream) => this.onTrackHandler(stream);
return peerConnection;
}
async createOffer(id, option) {
try {
// Todo option setting
const offer = await this.peers.get(id).createOffer(option);
return offer;
} catch (e) {
console.log(e);
}
}
async createAnswer(id, option) {
try {
// Todo option setting
const answer = await this.peers.get(id).createAnswer(option);
return answer;
} catch (e) {
console.log(e);
}
}
async setLocalDescription(description) {
try {
await this.peers.get(this.id).setLocalDescription(description);
} catch (e) {
console.log(e);
}
}
async setRemoteDescription(description) {
try {
await this.peers.get(this.id).setRemoteDescription(description);
} catch (e) {
console.log(e);
}
}
}
and then my gateway code
sfu.gateway.ts
import { UsePipes, ValidationPipe } from '#nestjs/common';
import {
SubscribeMessage,
WebSocketGateway,
OnGatewayInit,
OnGatewayConnection,
OnGatewayDisconnect,
} from '#nestjs/websockets';
import { Server, Socket } from 'socket.io';
import { OfferDto } from 'src/wss/dto';
import { offerValidationPipe } from 'src/wss/pipes';
import { SfuService } from './sfu.service';
import * as DefaultRTCPeerConnection from 'wrtc';
const { RTCPeerConnection } = DefaultRTCPeerConnection;
#WebSocketGateway({
namespace: 'sfu',
cors: {
origin: [
'http://localhost:4000',
'http://localhost:3300',
'http://localhost:5000',
'http://localhost:3000',
],
},
})
export class SfuGateway
implements OnGatewayInit, OnGatewayConnection, OnGatewayDisconnect
{
constructor(private service: SfuService) {}
server: Server;
afterInit(_server: Server) {
this.server = _server;
}
handleConnection(socket: Socket, ...args: any[]) {
console.log(socket.id, 'Connected!');
this.service.Test();
}
handleDisconnect(socket: Socket) {
console.log(socket.id, 'DisConnected!');
}
#UsePipes(new ValidationPipe())
#SubscribeMessage('join_room')
async JoinRoom(socket: Socket, roomName: string) {
socket.join(roomName);
socket.emit('welcome', socket.id);
return {};
}
#UsePipes(new offerValidationPipe())
#SubscribeMessage('offer')
async Offer(socket: Socket, data: OfferDto) {
this.service.createPeerConnection(socket.id);
const connection = this.service.getter();
connection.onicecandidate = (e) => {
socket.emit('ice', e.candidate, socket.id);
};
const t = new RTCPeerConnection();
t.setRemoteDescription(data.offer);
console.log('offer Set!', data.offer);
await this.service.setRemoteDescription(data.offer);
console.log('Offer Set Complete\n');
const temp = await this.service.createAnswer(socket.id, {
offerToReceiveAudio: false,
offerToReceiveVideo: false,
});
console.log('Answer ppppppppppp : ', temp);
this.service.setLocalDescription(temp);
const offer = this.service.createOffer(socket.id, {
offerToReceiveAudio: false,
offerToReceiveVideo: false,
});
console.log(offer);
socket.emit('test', offer);
socket.to(data.roomName).emit('offer', data.offer, socket.id);
}
}
my package.json
{
"name": "socketserver",
"version": "0.0.1",
"description": "",
"author": "",
"private": true,
"license": "UNLICENSED",
"scripts": {
"prebuild": "rimraf dist",
"build": "nest build",
"format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
"start": "nest start",
"start:dev": "nest start --watch",
"start:debug": "nest start --debug --watch",
"start:prod": "node dist/main",
"lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
"test": "jest",
"test:watch": "jest --watch",
"test:cov": "jest --coverage",
"test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
"test:e2e": "jest --config ./test/jest-e2e.json"
},
"dependencies": {
"#nestjs/common": "^8.0.0",
"#nestjs/core": "^8.0.0",
"#nestjs/platform-express": "^8.0.0",
"#nestjs/platform-socket.io": "^9.0.3",
"#nestjs/websockets": "^9.0.3",
"class-transformer": "^0.5.1",
"class-validator": "^0.13.2",
"nestjs-socket-handlers-with-ack": "^2.0.0",
"reflect-metadata": "^0.1.13",
"rimraf": "^3.0.2",
"rxjs": "^7.5.6",
"rxjs-compat": "^6.6.7",
"socket.io-redis": "^6.1.1",
"wrtc": "^0.4.7"
},
"devDependencies": {
"#nestjs/cli": "^8.0.0",
"#nestjs/schematics": "^8.0.0",
"#nestjs/testing": "^8.0.0",
"#types/express": "^4.17.13",
"#types/jest": "27.5.0",
"#types/node": "^16.0.0",
"#types/socket.io": "^3.0.2",
"#types/supertest": "^2.0.11",
"#types/ws": "^8.5.3",
"#typescript-eslint/eslint-plugin": "^5.0.0",
"#typescript-eslint/parser": "^5.0.0",
"eslint": "^8.0.1",
"eslint-config-prettier": "^8.3.0",
"eslint-plugin-prettier": "^4.0.0",
"jest": "28.0.3",
"prettier": "^2.3.2",
"source-map-support": "^0.5.20",
"supertest": "^6.1.3",
"ts-jest": "28.0.1",
"ts-loader": "^9.2.3",
"ts-node": "^10.0.0",
"tsconfig-paths": "4.0.0",
"typescript": "^4.3.5"
},
"jest": {
"moduleFileExtensions": [
"js",
"json",
"ts"
],
"rootDir": "src",
"testRegex": ".*\\.spec\\.ts$",
"transform": {
"^.+\\.(t|j)s$": "ts-jest"
},
"collectCoverageFrom": [
"**/*.(t|j)s"
],
"coverageDirectory": "../coverage",
"testEnvironment": "node"
}
}
Please Help me!!