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|
package federation
import (
"fmt"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/kubernetes"
"github.com/miekg/dns"
"github.com/mholt/caddy"
)
func init() {
caddy.RegisterPlugin("federation", caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
fed, err := federationParse(c)
if err != nil {
return plugin.Error("federation", err)
}
// Do this in OnStartup, so all plugin has been initialized.
c.OnStartup(func() error {
m := dnsserver.GetConfig(c).Handler("kubernetes")
if m == nil {
return nil
}
if x, ok := m.(*kubernetes.Kubernetes); ok {
fed.Federations = x.Federations
}
return nil
})
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
fed.Next = next
return fed
})
return nil
}
func federationParse(c *caddy.Controller) (*Federation, error) {
fed := New()
for c.Next() {
// federation [zones..]
zones := c.RemainingArgs()
origins := []string{}
if len(zones) > 0 {
origins = make([]string, len(zones))
copy(origins, zones)
} else {
origins = make([]string, len(c.ServerBlockKeys))
copy(origins, c.ServerBlockKeys)
}
for c.NextBlock() {
x := c.Val()
switch x {
default:
args := c.RemainingArgs()
if x := len(args); x != 1 {
return fed, fmt.Errorf("need two arguments for federation, got %d", x)
}
fed.f[x] = dns.Fqdn(args[0])
}
}
for i := range origins {
origins[i] = plugin.Host(origins[i]).Normalize()
}
fed.zones = origins
if len(fed.f) == 0 {
return fed, fmt.Errorf("at least one name to zone federation expected")
}
return fed, nil
}
return fed, nil
}
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