-
Notifications
You must be signed in to change notification settings - Fork 781
/
cidr.go
82 lines (66 loc) · 1.51 KB
/
cidr.go
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
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
package flagext
import (
"net"
"strings"
"github.com/pkg/errors"
)
// CIDR is a network CIDR.
type CIDR struct {
Value *net.IPNet
}
// String implements flag.Value.
func (c CIDR) String() string {
if c.Value == nil {
return ""
}
return c.Value.String()
}
// Set implements flag.Value.
func (c *CIDR) Set(s string) error {
_, value, err := net.ParseCIDR(s)
if err != nil {
return err
}
c.Value = value
return nil
}
// CIDRSliceCSV is a slice of CIDRs that is parsed from a comma-separated string.
// It implements flag.Value and yaml Marshalers.
type CIDRSliceCSV []CIDR
// String implements flag.Value
func (c CIDRSliceCSV) String() string {
values := make([]string, 0, len(c))
for _, cidr := range c {
values = append(values, cidr.String())
}
return strings.Join(values, ",")
}
// Set implements flag.Value
func (c *CIDRSliceCSV) Set(s string) error {
parts := strings.Split(s, ",")
for _, part := range parts {
cidr := &CIDR{}
if err := cidr.Set(part); err != nil {
return errors.Wrapf(err, "cidr: %s", part)
}
*c = append(*c, *cidr)
}
return nil
}
// UnmarshalYAML implements yaml.Unmarshaler.
func (c *CIDRSliceCSV) UnmarshalYAML(unmarshal func(interface{}) error) error {
var s string
if err := unmarshal(&s); err != nil {
return err
}
// An empty string means no CIDRs has been configured.
if s == "" {
*c = nil
return nil
}
return c.Set(s)
}
// MarshalYAML implements yaml.Marshaler.
func (c CIDRSliceCSV) MarshalYAML() (interface{}, error) {
return c.String(), nil
}