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
|
package metadata
import (
"fmt"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/mholt/caddy"
)
func init() {
caddy.RegisterPlugin("metadata", caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
m, err := metadataParse(c)
if err != nil {
return err
}
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
m.Next = next
return m
})
c.OnStartup(func() error {
plugins := dnsserver.GetConfig(c).Handlers()
// Collect all plugins which implement Provider interface
metadataVariables := map[string]bool{}
for _, p := range plugins {
if met, ok := p.(Provider); ok {
for _, varName := range met.MetadataVarNames() {
if _, ok := metadataVariables[varName]; ok {
return fmt.Errorf("Metadata variable '%v' has duplicates", varName)
}
metadataVariables[varName] = true
}
m.Providers = append(m.Providers, met)
}
}
return nil
})
return nil
}
func metadataParse(c *caddy.Controller) (*Metadata, error) {
m := &Metadata{}
c.Next()
zones := c.RemainingArgs()
if len(zones) != 0 {
m.Zones = zones
for i := 0; i < len(m.Zones); i++ {
m.Zones[i] = plugin.Host(m.Zones[i]).Normalize()
}
} else {
m.Zones = make([]string, len(c.ServerBlockKeys))
for i := 0; i < len(c.ServerBlockKeys); i++ {
m.Zones[i] = plugin.Host(c.ServerBlockKeys[i]).Normalize()
}
}
if c.NextBlock() || c.Next() {
return nil, plugin.Error("metadata", c.ArgErr())
}
return m, nil
}
|
