I am implementing a multi part file downloader and I need help to find the
blocking element in the following piece of code.
func downPart(wg *sync.WaitGroup, url string, dataChan chan []byte, range1,
range2 int) {
defer wg.Done()
client := new(http.Client)
req, _ := http.NewRequest("GET", url, nil)
req.Header.Set("Range", strconv.Itoa(range1)+"-"+strconv.Itoa(range2))
data, err := client.Do(req)
if err != nil {
fmt.Println(err)
return
}
dataByte := new(bytes.Buffer)
dataByte.ReadFrom(data.Body)
fmt.Println("Done")
dataChan <- dataByte.Bytes()
}
func multiDownload(url string, length int) bool {
var wg sync.WaitGroup
x := 4
split := length / x
fmt.Println(length)
dataChan := make([]chan []byte, x)
for i := 0; i < x; i++ {
wg.Add(1)
range1 := i * split
range2 := (i+1)*split - 1
if range2 == length-2 {
range2 = length
}
fmt.Println(len(dataChan), range1, range2)
go downPart(&wg, url, dataChan[i], range1, range2)
}
var data []byte
wg.Wait()
for i := 0; i < x; i++ {
fmt.Println("waiting")
data = <-dataChan[i]
fmt.Println(data)
}
return true
}
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