How do i track the upload progress in golang - http

Question

i'm trying to track the upload progress in GOLANG, that's what i got at the moment
func Upload(w http.ResponseWriter, req *http.Request) {
mr, err := req.MultipartReader()
if err != nil {
return
}
for {
// var part *multipart.Part
part, err := mr.NextPart()
mr.partsRead
if err == io.EOF {
break
}
println(part)
}
}

Answer 1

This will work, a stream to calc the bytes read and the total progress you need to point the stream somewhere, in this code example I pointed it to a file.
func Upload(w http.ResponseWriter, req *http.Request) {
mr, err := req.MultipartReader()
if err != nil {
return
}
length := req.ContentLength
for {
part, err := mr.NextPart()
if err == io.EOF {
break
}
var read int64
var p float32
dst, err := os.OpenFile("dstfile", os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return
}
for {
buffer := make([]byte, 100000)
cBytes, err := part.Read(buffer)
if err == io.EOF {
break
}
read = read + int64(cBytes)
//fmt.Printf("read: %v \n",read )
p = float32(read) / float32(length) *100
fmt.Printf("progress: %v \n",p )
dst.Write(buffer[0:cBytes])
}
}
}