Angular 8 socket.io-观察者未触发

Question

我使用Ionic 4和Angular 8，

我正在尝试在套接字上侦听特定消息，该套接字连接正常，我可以看到客户端很好地接收到该消息，但是观察者从不触发（通知或连接）

此代码可以正常工作，我取消了所有身份验证逻辑，这似乎只是我必须使用promises来获取要提供给套接字的用户凭据的原因（我知道使用查询参数是不好的）

这是实现

import { Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import { Observer } from 'rxjs';
import * as socketIo from 'socket.io-client';

interface Notification {
    unformatedMessage: string;
    title: string;
}

// Socket.io events
export enum Event {
    CONNECT = 'connect',
    DISCONNECT = 'disconnect'
}

@Injectable({
  providedIn: 'root'
})
export class NotificationsService{

    private socket;

   public initSocket(data): void {
        this.socket = socketIo("MY_NODE_SERVER", {query: data})
   }

   public onMessage(): Observable<Notification> {
       return new Observable<Notification>(observer => {
           this.socket.on('notification', (data: Notification) => {
               observer.next(data)});
        });
   }

   public onEvent(event: Event): Observable<any> {
       return new Observable<Event>(observer => {
           this.socket.on(event, () => observer.next());
       });
   }
}

然后这样称呼；

ngInit(){
   this.authService.getCredentials().then((data)=>{
       this.notifications.initSocket(data);
       this.notifications.onMessage().subscribe((message: Notification) => {
           console.log(message)
       });

       this.notifications.onEvent(Event.CONNECT).subscribe(() => {
           console.log('connected');
       });

       this.notifications.onEvent(Event.DISCONNECT).subscribe(() => {
           console.log('disconnected');
       });
   });
}