Can GoQuery be used in conjunction with Go's concurrency features?

Yes, GoQuery can be used in conjunction with Go's concurrency features to perform web scraping tasks concurrently. GoQuery is a library that provides jQuery-like selectors for parsing HTML documents, which makes it very convenient for web scraping. By leveraging Go's concurrency features, such as goroutines and channels, you can scrape multiple pages simultaneously, thus speeding up the entire process.

Here's a simple example of how you might use GoQuery with Go's concurrency features to scrape multiple web pages concurrently:

package main

import (
    "fmt"
    "log"
    "net/http"
    "sync"

    "github.com/PuerkitoBio/goquery"
)

// scrapePage scrapes the content from a single web page.
func scrapePage(url string, wg *sync.WaitGroup) {
    defer wg.Done()

    // Send an HTTP GET request
    res, err := http.Get(url)
    if err != nil {
        log.Printf("Error fetching URL %s: %v", url, err)
        return
    }
    defer res.Body.Close()

    if res.StatusCode != 200 {
        log.Printf("Status code error for URL %s: %d %s", url, res.StatusCode, res.Status)
        return
    }

    // Parse the page body with goquery
    doc, err := goquery.NewDocumentFromReader(res.Body)
    if err != nil {
        log.Printf("Error parsing URL %s: %v", url, err)
        return
    }

    // Use GoQuery to find specific elements
    doc.Find("title").Each(func(i int, s *goquery.Selection) {
        title := s.Text()
        fmt.Printf("Page title of %s: %s\n", url, title)
    })
}

func main() {
    var wg sync.WaitGroup

    urls := []string{
        "https://example.com",
        "https://example.org",
        "https://example.net",
        // Add more URLs as needed
    }

    for _, url := range urls {
        wg.Add(1)
        // Launch a goroutine for each URL
        go scrapePage(url, &wg)
    }

    // Wait for all goroutines to complete
    wg.Wait()
    fmt.Println("Scraping complete.")
}

In this example, we define a scrapePage function that performs the actual scraping task for a single page. We use sync.WaitGroup to wait for all goroutines to finish their work. For each URL, we start a new goroutine with go scrapePage(url, &wg) and increment the wait group counter with wg.Add(1). The defer wg.Done() call inside scrapePage ensures that the wait group counter is decremented once the function completes.

Keep in mind that when using concurrency for web scraping, you should be respectful of the target website's server resources and terms of service. Some websites may have rate limiting or other mechanisms in place to prevent or manage automated access, and you should ensure your concurrent scrapers do not violate these constraints.