doneit-web/src/app/store/chat/chat-user.service.ts

import { Injectable } from '@angular/core';
import { localstoreService } from '../localstore.service';
import { SHA1 }  from  'crypto-js';

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

  // main data
  private _userList = {}
  // local storage keyName
  private keyName: string;

  constructor() {

    this.keyName = (SHA1('chat'+this.constructor.name)).toString()

    setTimeout(()=> {
      let restore = localstoreService.get(this.keyName, {})
      this._userList = restore.userList || {}
    }, 10)

  }

  get userList() {
    return this._userList
  }

  add(roomId:string, userList: any[] = []) {
    
    this._userList[roomId] = userList

    this.save()
  }

  private save() {
    setTimeout(()=> {
      localstoreService.set(this.keyName, {
        userList:  this._userList
      })
    }, 10)
  }
}


export const ChatUserStorage = new ChatUserService()