I try to adapt this example: https://gobyexample.com/worker-pools
But I don't know how to stop the channel because program don't exit at the end of the channel loop.
Can you explain how to exit the program?
package main
import (
"github.com/SlyMarbo/rss"
"bufio"
"fmt"
"log"
"os"
)
func readLines(path string) ([]string, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
var lines []string
scanner := bufio.NewScanner(file)
for scanner.Scan() {
lines = append(lines, scanner.Text())
}
return lines, scanner.Err()
}
func worker(id int, jobs <-chan string, results chan<- string) {
for url := range jobs {
fmt.Println("worker", id, "processing job", url)
feed, err := rss.Fetch(url)
if err != nil {
fmt.Println("Error on: ", url)
continue
}
borne := 0
for _, value := range feed.Items {
if borne < 5 {
results <- value.Link
borne = borne +1
} else {
continue
}
}
}
}
func main() {
jobs := make(chan string)
results := make(chan string)
for w := 1; w <= 16; w++ {
go worker(w, jobs, results)
}
urls, err := readLines("flux.txt")
if err != nil {
log.Fatalf("readLines: %s", err)
}
for _, url := range urls {
jobs <- url
}
close(jobs)
// it seems program runs over...
for msg := range results {
fmt.Println(msg)
}
}
The flux.txt is a flat text file like :