forked from projectcalico/libcalico-go
-
Notifications
You must be signed in to change notification settings - Fork 0
/
asnumber.go
73 lines (63 loc) · 2.02 KB
/
asnumber.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
// Copyright (c) 2016 Tigera, Inc. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package numorstring
import (
"encoding/json"
"errors"
"fmt"
"strconv"
"strings"
)
type ASNumber uint32
// ASNumberFromString creates an ASNumber struct from a string value. The
// string value may simply be a number or may be the ASN in dotted notation.
func ASNumberFromString(s string) (ASNumber, error) {
if num, err := strconv.ParseUint(s, 10, 32); err == nil {
return ASNumber(num), nil
}
parts := strings.Split(s, ".")
if len(parts) != 2 {
msg := fmt.Sprintf("invalid AS Number format (%s)", s)
return 0, errors.New(msg)
}
if num1, err := strconv.ParseUint(parts[0], 10, 16); err != nil {
msg := fmt.Sprintf("invalid AS Number format (%s)", s)
return 0, errors.New(msg)
} else if num2, err := strconv.ParseUint(parts[1], 10, 16); err != nil {
msg := fmt.Sprintf("invalid AS Number format (%s)", s)
return 0, errors.New(msg)
} else {
return ASNumber((num1 << 16) + num2), nil
}
}
// UnmarshalJSON implements the json.Unmarshaller uinterface.
func (a *ASNumber) UnmarshalJSON(b []byte) error {
if err := json.Unmarshal(b, (*uint32)(a)); err == nil {
return nil
} else {
var s string
if err := json.Unmarshal(b, &s); err != nil {
return err
}
if v, err := ASNumberFromString(s); err != nil {
return err
} else {
*a = v
return nil
}
}
}
// String returns the string value, or the Itoa of the uint value.
func (a ASNumber) String() string {
return strconv.FormatUint(uint64(a), 10)
}