1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
package main
import (
"fmt"
"strings"
"os"
"io"
"net/http"
"path/filepath"
)
// WriteCounter counts the number of bytes written to it
type WriteCounter struct {
Filepath string
Total uint64
}
func (wc *WriteCounter) Write(p []byte) (int, error) {
n := len(p)
wc.Total += uint64(n)
wc.PrintProgress()
return n, nil
}
func (wc *WriteCounter) PrintProgress() {
// clear the line by using a character return to go back to the start of the
// line and remove the remaining characters
fmt.Printf("\r%s", strings.Repeat(" ", 35))
fmt.Printf("\r[%s]... %d bytes complete", wc.Filepath, wc.Total)
}
func downloadFile(path string, url string) error {
// make sure dir exists
os.MkdirAll(filepath.Dir(path), 0777)
// create .part file
output, err := os.Create(path + ".part")
if err != nil {
return err
}
defer output.Close()
// get data
response, err := http.Get(url)
if err != nil {
return err
}
defer response.Body.Close()
// create progress reporter
counter := &WriteCounter{path, 0}
_, err = io.Copy(output, io.TeeReader(response.Body, counter))
if err != nil {
return err
}
fmt.Printf("\n")
//fmt.Printf("\r%s", strings.Repeat(" ", 40))
os.Rename(path + ".part", path)
//fmt.Printf("\r[%s] complete\n", path)
return nil
}
|
