main.go

package main

import (
	"log"
	"math/rand"
	"sync"
	"time"

	"github.com/google/uuid"
)

func main() {
	log.Println("Hello World")

	r := rand.New(rand.NewSource(99))

	var wg sync.WaitGroup
	count := 0
	in := make(chan string, 5)

	// create 5 workers to consume a channel
	for i := 0; i < 20; i++ {
		wg.Add(1)
		count++
		go func(name int, in chan string) {
			defer wg.Done()
			completed := 0
			for val := range in {
				completed++
				sleep := time.Duration(r.Intn(60)) * time.Second
				time.Sleep(sleep)
				log.Printf("goroutine-%02d-%02d: %s took %s", name, completed, val, sleep.String())
			}
		}(count, in)
	}

	// generate random strings because I am lazy
	for index := 0; index < 10000; index++ {
		in <- uuid.New().String()
	}

	close(in)

	wg.Wait()
}