Dma Proxy

To quickly scrape a large number of sites using Node.js, you can leverage asynchronous programming and utilize libraries like axios for making HTTP requests and cheerio for parsing HTML. Additionally, you may consider using the p-queue library to manage the concurrency and control the rate of requests. Here's a basic example to get you started

Install Required Packages:

npm install axios cheerio p-queue

Create a Scraper Script:

const axios = require('axios');
const cheerio = require('cheerio');
const PQueue = require('p-queue');

// List of sites to scrape
const sites = [
  'https://example1.com',
  'https://example2.com',
  // Add more URLs as needed
];

// Set the concurrency level (adjust as needed)
const concurrency = 5;

// Initialize a queue with concurrency control
const queue = new PQueue({ concurrency });

// Function to scrape a single site
async function scrapeSite(url) {
  try {
    const response = await axios.get(url);
    const $ = cheerio.load(response.data);

    // Use Cheerio to parse and extract data
    const title = $('title').text();
    console.log(`Scraped ${url} - Title: ${title}`);
  } catch (error) {
    console.error(`Error scraping ${url}: ${error.message}`);
  }
}

// Enqueue scraping tasks for each site
sites.forEach((site) => {
  queue.add(() => scrapeSite(site));
});

// Wait for all tasks to complete
queue.onIdle().then(() => {
  console.log('All scraping tasks completed.');
});

This example uses axios for making HTTP requests, cheerio for HTML parsing, and p-queue for controlling concurrency.

Run the Script:

node your_scraper_script.js

Adjust the sites array with the URLs you want to scrape.

This example uses a simple queue system to control the number of concurrent requests, preventing potential issues with rate limiting or overwhelming the target websites. However, be mindful of the websites' terms of service and robots.txt rules to avoid scraping restrictions.

To catch a dynamic element using Selenium, you can use various methods depending on the specifics of the element and the browser you are using. Here are some common approaches:

Using WebDriverWait and expected_conditions:

The WebDriverWait class is used to wait for a specific condition to be met before proceeding with the script. You can use the expected_conditions module to define the condition you want to wait for.

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

driver = webdriver.Chrome()
driver.get("https://www.example.com")

dynamic_element = WebDriverWait(driver, 10).until(
    EC.presence_of_element_located((By.ID, "dynamic-element-id"))
)

In this example, the script will wait up to 10 seconds for the element with the ID dynamic-element-id to appear on the page. Once the element is present, it can be interacted with or located.

Using JavaScript to interact with dynamic elements:

You can use the execute_script() method to run JavaScript code in the context of the current page. This allows you to interact with dynamic elements that may not be accessible through the regular Selenium methods.

from selenium import webdriver

driver = webdriver.Chrome()
driver.get("https://www.example.com")

dynamic_element = driver.execute_script("return document.getElementById('dynamic-element-id');")

In this example, the script runs JavaScript code to get a reference to the element with the ID dynamic-element-id. You can then interact with the element using JavaScript or Selenium methods.

Using actions with dynamic elements:

The actions module allows you to simulate user interactions, such as mouse movements and clicks. You can use this module to interact with dynamic elements that require user-like interaction.

from selenium import webdriver
from selenium.webdriver.common.action_chains import ActionChains

driver = webdriver.Chrome()
driver.get("https://www.example.com")

dynamic_element = driver.find_element(By.ID, "dynamic-element-id")
actions = ActionChains(driver)
actions.move_to_element(dynamic_element).perform()
actions.click(dynamic_element).perform()

In this example, the script moves the mouse cursor to the dynamic element and simulates a click, which may be necessary if the element is interactive or requires user-like interaction.

Remember to replace "https://www.example.com", "dynamic-element-id", and other elements with the actual values for the website you are working with. Also, ensure that the browser driver (e.g., ChromeDriver for Google Chrome) is installed and properly configured in your environment.

In Selenium, you can check if the DOM of a page is loaded by using JavaScriptExecutor. Here's how you can check:

from selenium import webdriver

driver = webdriver.Chrome()
driver.get("http://www.example.com")

while True:
    try:
        driver.execute_script("return document.readyState")
        if driver.execute_script("return document.readyState") == "complete":
            print("Page is loaded")
            break
    except Exception as e:
        print("Exception occurred")

In this script, the document.readyState property is used to check if the page is loaded or not. In JavaScript, the "complete" value of document.readyState indicates that the page is loaded.

This script will keep running until the page is loaded. Once the page is loaded, it will print "Page is loaded" and break the loop.

Please note that this script assumes that the page is completely loaded when document.readyState is "complete". However, this is not always the case. Sometimes, some elements may still be loading even when document.readyState is "complete". So, it's better to use explicit or implicit waits to wait for specific elements to be present or visible.

In the "System Settings" section, open the "Network" tab, and then, when you highlight the active connection, click "Advanced". Here, in the "Proxies" tab, tick only the HTTP proxy if you do not intend to use other types of proxies temporarily. Enter the address of your proxy server and its port in the designated fields and click "OK".

The term "public" should be understood to mean open proxy servers. That is, they can be used by all users without exception. They can be insecure and are often quite overloaded, so the connection speed or response time when using public proxies can be very slow.