berkslv

using Microsoft.AspNetCore.SignalR;
using WebAPI.Helpers.Models;

public class ChatHub : Hub
{
    [HubMethodName("SendMessageToAll")]
    public async Task SendMessage(ChatMessage message)
    {
        await Clients.All.SendAsync("ReceiveMessage", message);
    }

berkslv

public class ChatMessage
{
    public string User { get; set; }
    public string Message { get; set; }
}

berkslv

app.UseEndpoints(endpoints =>
{
    endpoints.MapControllers();
    endpoints.MapHub<ChatHub>("/hubs/chat");
});

berkslv

services.AddCors(options =>
{
    options.AddPolicy("ClientPermission", policy =>
    {
        policy.AllowAnyHeader()
            .AllowAnyMethod()
            .WithOrigins("http://localhost:3000")
            .AllowCredentials();
    });
});

berkslv

app.UseCors("ClientPermission");

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services.AddSignalR();

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import "bootstrap/dist/css/bootstrap.min.css";

berkslv

import React, { useState, useEffect, useRef } from "react";
import { HubConnectionBuilder } from "@microsoft/signalr";
import ChatWindow from "./ChatWindow";
import ChatInput from "./ChatInput";
import { Container } from "reactstrap";

const Chat = () => {
  const [connection, setConnection] = useState(null);
  const [chat, setChat] = useState([]);
  const latestChat = useRef(null);

berkslv

async function scrapePrice(url){
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.goto(url);

  const [el] = await page.$x('<XPath>');
  const txt = await (await el.getProperty('textContent')).jsonValue(); // return 9,71 but parseFloat need to period not comma
  browser.close();
  let stringTxt = JSON.stringify(txt).replace('"',"").replace('"',"").replace(",","."); // first change json to string type, this return "number.decimal" and some string methods
}

berkslv

let puppeteer = require('puppeteer');
var nodemailer = require('nodemailer');

scrapePrice('https://www.google.com/search?client=opera&hs=Wzk&sxsrf=ALeKk00I7IW96h0D13mdL99WUos0Xhz5MA%3A1604829566135&ei=fsGnX_DmB4XosAeQpInwAQ&q=türk+hava+yolları+hisse&oq=türk+hava+yolları+hisse&gs_lcp=CgZwc3ktYWIQAzIICAAQyQMQywEyBQgAEMsBMgUIABDLATIFCAAQywEyBQgAEMsBMgUIABDLATIFCAAQywEyBQgAEMsBMgUIABDLATIFCAAQywE6BAgAEEc6CwguEMcBEK8BEMsBUMULWKYSYNcSaABwAngAgAGpAogBwAeSAQUwLjQuMZgBAKABAaoBB2d3cy13aXrIAQjAAQE&sclient=psy-ab&ved=0ahUKEwjwnduB2PLsAhUFNOwKHRBSAh4Q4dUDCAw&uact=5');

function main(srcTxt)
{
    
    let currentPrice = srcTxt;
    let myPrice = 9.62;