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Video:

WorkerPools in Go

June 24, 2021

Course Instructor: Elliot Forbes

Hey Gophers! My name is Elliot and I'm the creator of TutorialEdge and I've been working with Go systems for roughly 5 years now.

In this video, we are going to be looking at WorkerPools in Go and what they are used for.

Code

package main

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

type Site struct {
	URL string
}

type Result struct {
	URL    string
	Status int
}

func crawl(wId int, jobs <-chan Site, results chan<- Result) {
	for site := range jobs {
		log.Printf("Worker ID: %d\n", wId)
		resp, err := http.Get(site.URL)
		if err != nil {
			log.Println(err.Error())
		}
		results <- Result{
			URL:    site.URL,
			Status: resp.StatusCode,
		}
	}
}

func main() {
	fmt.Println("worker pools in Go")

	jobs := make(chan Site, 3)
	results := make(chan Result, 3)

	for w := 1; w <= 3; w++ {
		go crawl(w, jobs, results)
	}

	urls := []string{
		"https://tutorialedge.net",
		"https://tutorialedge.net/pricing/",
		"https://example.com",
		"https://google.com",
	}

	for _, url := range urls {
		jobs <- Site{URL: url}
	}
	close(jobs)

	for a := 1; a <= 4; a++ {
		result := <-results
		log.Println(result)
	}

}

Output

worker pools in Go
2021/07/14 09:54:18 Worker ID: 3
2021/07/14 09:54:18 Worker ID: 1
2021/07/14 09:54:18 Worker ID: 2
2021/07/14 09:54:19 Worker ID: 3
2021/07/14 09:54:19 {https://tutorialedge.net 200}
2021/07/14 09:54:19 {https://tutorialedge.net/pricing/ 200}
2021/07/14 09:54:19 {https://example.com 200}
2021/07/14 09:54:19 {https://google.com 200}