audiokitap-download.go

package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"time"

	"encoding/json"

	"github.com/cavaliercoder/grab"
)

type myFilename struct {
	name string
	link string
}

func fileLinks(jsonstr []byte) []myFilename {
	jsonMap := make(map[string]string)

	_ = json.Unmarshal(jsonstr, &jsonMap)
	mfs := make([]myFilename, 0)

	for k, v := range jsonMap {
		mfs = append(mfs, myFilename{k, v})
	}
	return mfs
}

//func down()

func main() {
	filename := os.Args[1]
	dat, _ := ioutil.ReadFile(filename)
	folderName := filename[:len(filename)-5]
	fmt.Println(folderName)
	mfs := fileLinks(dat)
	_ = os.Mkdir(folderName, 0755)

	reqs := make([]*grab.Request, 0)

	client := grab.NewClient()
	for _, v := range mfs {
		req, _ := grab.NewRequest(
			folderName+"/"+v.name+".mp3",
			v.link)
		reqs = append(reqs, req)
	}

	resp := <-client.DoBatch(100, reqs...)
	t := time.NewTicker(500 * time.Millisecond)
	defer t.Stop()
	Loop:
	for {
		select {
		case <-t.C:
			fmt.Printf("  transferred %v / %v bytes (%.2f%%)\n",
				resp.BytesComplete(),
				resp.Size,
				100*resp.Progress())

		case <-resp.Done:
			println("done!")
			break Loop
		}
	}

}