-
Notifications
You must be signed in to change notification settings - Fork 0
/
uid.go
91 lines (80 loc) · 1.32 KB
/
uid.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
83
84
85
86
87
88
89
90
91
package uid
import (
"github.com/bwmarrin/snowflake"
"github.com/rs/xid"
"net"
"os"
)
// snowflake (8bytes)
type Node struct {
*snowflake.Node
}
// nodeID : 0 --> 1023
func NewNode(nodeID ...int64) (*Node, error) {
var id int64
if len(nodeID) == 0 {
cid, err := centerID()
if err != nil {
return nil, err
}
wid, err := workID()
if err != nil {
return nil, err
}
id = cid | wid
} else {
id = nodeID[0]
}
node, err := snowflake.NewNode(id)
if err != nil {
return nil, err
}
return &Node{Node: node}, nil
}
func (n *Node) GenerateID() int64 {
return n.Generate().Int64()
}
// center id 5bits
func centerID() (int64, error) {
address, err := net.InterfaceAddrs()
if err != nil {
return 0, err
}
var (
in *net.IPNet
ok bool
ip string
)
for _, addr := range address {
in, ok = addr.(*net.IPNet)
if !ok || in.IP.IsLoopback() {
continue
}
if in.IP.To4() == nil {
continue
}
ip = in.IP.String()
break
}
var sum uint8
for _, bs := range []byte(ip) {
sum += bs
}
return int64(sum%32) << 5, nil
}
// work id 5bits
func workID() (int64, error) {
hn, err := os.Hostname()
if err != nil {
return 0, nil
}
var sum uint8
for _, bs := range []byte(hn) {
sum += bs
}
return int64(sum % 32), nil
}
// xid (12bytes)
func GenerateID() string {
return xid.New().String()
}