/
handler.go
69 lines (54 loc) · 1.15 KB
/
handler.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
package sticky
import (
"fmt"
"github.com/miekg/dns"
"github.com/buglloc/rip/v2/pkg/cfg"
"github.com/buglloc/rip/v2/pkg/handlers"
"github.com/buglloc/rip/v2/pkg/handlers/limiter"
)
const ShortName = "s"
const Name = "sticky"
var _ handlers.Handler = (*Handler)(nil)
type Handler struct {
handlers.BaseHandler
Nested [2]handlers.Handler
Cur int
}
func NewHandler(modifiers ...limiter.Limiter) *Handler {
return &Handler{
BaseHandler: handlers.BaseHandler{
Limiters: modifiers,
},
}
}
func (h *Handler) Name() string {
return Name
}
func (h *Handler) Init(p handlers.Parser) error {
var err error
h.Nested[0], err = p.NextHandler()
if err != nil {
return err
}
h.Nested[1], err = p.NextHandler()
if err != nil {
return err
}
h.Nested[1].SetDefaultLimiters(&limiter.TTL{
TTL: cfg.StickyTTL,
})
return nil
}
func (h *Handler) Handle(question dns.Question) ([]dns.RR, bool, error) {
rr, moveOn, err := h.Nested[h.Cur].Handle(question)
if err != nil {
return nil, false, fmt.Errorf("sticky: %w", err)
}
if moveOn {
h.Cur = (h.Cur + 1) % 2
}
if len(rr) > 0 {
h.Limiters.Use()
}
return rr, h.Limiters.MoveOn(), nil
}