blob: 28c9d7de585c56812282fb406834c16a8bc6ef07 (
plain)
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 channel
import (
"fmt"
"io"
"sync"
"github.com/pkg/errors"
)
// WriteCloser is an io.WriteCloser that that proxies Write() calls to a channel
// The []byte buffer of the Write() is queued on the channel as one message.
type WriteCloser interface {
io.WriteCloser
Chan() <-chan []byte
}
type writeCloser struct {
ch chan []byte
mux sync.Mutex
}
// NewWriter initializes a new channel writer
func NewWriter(c chan []byte) WriteCloser {
return &writeCloser{
ch: c,
}
}
// Chan returns the R/O channel behind WriteCloser
func (w *writeCloser) Chan() <-chan []byte {
return w.ch
}
// Write method for WriteCloser
func (w *writeCloser) Write(b []byte) (bLen int, err error) {
// https://github.com/containers/podman/issues/7896
// when podman-remote pull image, if it was killed, the server will panic: send on closed channel
// so handle it
defer func() {
if rErr := recover(); rErr != nil {
err = fmt.Errorf("%s", rErr)
}
}()
if w == nil || w.ch == nil {
return 0, errors.New("use channel.NewWriter() to initialize a WriteCloser")
}
w.mux.Lock()
defer w.mux.Unlock()
buf := make([]byte, len(b))
copy(buf, b)
w.ch <- buf
return len(b), nil
}
// Close method for WriteCloser
func (w *writeCloser) Close() error {
close(w.ch)
return nil
}
|
