go并发-采用最快回应

package main

import (
	"fmt"
	"math/rand"
	"time"
)

func fetchData(server string, ch chan<- string) {
	time.Sleep(time.Duration(rand.Intn(10000)) * time.Millisecond)
	ch <- fmt.Sprintf("Data from %s", server)
}

func main() {
	ch := make(chan string)
	go fetchData("Server 1", ch)
	go fetchData("Server 2", ch)
	go fetchData("Server 3", ch)
	go fetchData("Server 4", ch)
	first := <-ch
	fmt.Printf(first)
}