Created
March 25, 2016 09:44
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golang download file with progress
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package main | |
/** | |
* @website http://albulescu.ro | |
* @author Cosmin Albulescu <cosmin@albulescu.ro> | |
*/ | |
import ( | |
"bytes" | |
"fmt" | |
"io" | |
"log" | |
"net/http" | |
"os" | |
"path" | |
"strconv" | |
"time" | |
) | |
func PrintDownloadPercent(done chan int64, path string, total int64) { | |
var stop bool = false | |
for { | |
select { | |
case <-done: | |
stop = true | |
default: | |
file, err := os.Open(path) | |
if err != nil { | |
log.Fatal(err) | |
} | |
fi, err := file.Stat() | |
if err != nil { | |
log.Fatal(err) | |
} | |
size := fi.Size() | |
if size == 0 { | |
size = 1 | |
} | |
var percent float64 = float64(size) / float64(total) * 100 | |
fmt.Printf("%.0f", percent) | |
fmt.Println("%") | |
} | |
if stop { | |
break | |
} | |
time.Sleep(time.Second) | |
} | |
} | |
func DownloadFile(url string, dest string) { | |
file := path.Base(url) | |
log.Printf("Downloading file %s from %s\n", file, url) | |
var path bytes.Buffer | |
path.WriteString(dest) | |
path.WriteString("/") | |
path.WriteString(file) | |
start := time.Now() | |
out, err := os.Create(path.String()) | |
if err != nil { | |
fmt.Println(path.String()) | |
panic(err) | |
} | |
defer out.Close() | |
headResp, err := http.Head(url) | |
if err != nil { | |
panic(err) | |
} | |
defer headResp.Body.Close() | |
size, err := strconv.Atoi(headResp.Header.Get("Content-Length")) | |
if err != nil { | |
panic(err) | |
} | |
done := make(chan int64) | |
go PrintDownloadPercent(done, path.String(), int64(size)) | |
resp, err := http.Get(url) | |
if err != nil { | |
panic(err) | |
} | |
defer resp.Body.Close() | |
n, err := io.Copy(out, resp.Body) | |
if err != nil { | |
panic(err) | |
} | |
done <- n | |
elapsed := time.Since(start) | |
log.Printf("Download completed in %s", elapsed) | |
} | |
func main() { | |
DownloadFile("https://wordpress.org/wordpress-4.4.2.zip","./") | |
} |
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Good stuff!
I had an issue after downloading a file I couldn't move it to another folder because of the following error:
The process cannot access the file because it is being used by another process.
and realised you probably need tofile.Close()
. I also movedos.Open(path)
outside of the for loop.Now it looks something like this: