file_go.go

file_go.go

package main

import (
	//"io/ioutil"
	"fmt"
	"log"
	"io"
	"os"
	"net/http"
	"time"
	"runtime"
)


func main() {
	c := make(chan string)
	start := time.Now()
	log.Println("Starting")
	links := map[string]string{
		"Python-3.7.0a2.tgz": "http://ipv4.download.thinkbroadband.com/1GB.zip",
		"Python-3.6.0.tgz": "http://ipv4.download.thinkbroadband.com/1GB.zip",
		"Python-3.5.0.tgz": "http://ipv4.download.thinkbroadband.com/1GB.zip",
		"Python-3.4.0.amd64.msi": "http://ipv4.download.thinkbroadband.com/1GB.zip",
		"python-3.7.0a1.exe": "http://ipv4.download.thinkbroadband.com/1GB.zip",
		"python-2.7.9rc1.amd64.msi": "http://ipv4.download.thinkbroadband.com/1GB.zip",
		"python-2.7.9-macosx10.6.pkg": "http://ipv4.download.thinkbroadband.com/1GB.zip",
		"python-3.6.2rc2-macosx10.6.pkg": "http://ipv4.download.thinkbroadband.com/1GB.zip",
		"python-3.6.2rc1.exe": "http://ipv4.download.thinkbroadband.com/1GB.zip",
		"python-3.6.2.exe": "http://ipv4.download.thinkbroadband.com/1GB.zip",

	}
	
	for n, link :=range(links){
		go downloadFile(n, link, c)

	}
	for i := 0; i < len(links); i++ {
		fmt.Println(<-c)
	}
	
	t := time.Now()
	elapsed := t.Sub(start)
	fmt.Println("total time to run the program", elapsed)
}

//Functions

func downloadFile(n string, link string, c chan string) {
	resp, err := http.Get(link)
	if err != nil {
		log.Println("Could not download file", link)
		c <- link
		return
	}
	defer resp.Body.Close()


	//Create file object 
	file, err := os.Create("/tmp/" + n)
	if err != nil {
		log.Fatal("Could not create file", n)
		return
	}

	log.Println("Downloading File", n)
	_, err = io.Copy(file, resp.Body)
	//ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Fatal(err)
		return

	}
	file.Close()
	log.Println("File downloaded")
	c <- link
}