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package external
import (
"errors"
"strconv"
"github.com/coredns/caddy"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/pkg/upstream"
)
const pluginName = "k8s_external"
func init() { plugin.Register(pluginName, setup) }
func setup(c *caddy.Controller) error {
e, err := parse(c)
if err != nil {
return plugin.Error("k8s_external", err)
}
// Do this in OnStartup, so all plugins have been initialized.
c.OnStartup(func() error {
m := dnsserver.GetConfig(c).Handler("kubernetes")
if m == nil {
return plugin.Error(pluginName, errors.New("kubernetes plugin not loaded"))
}
x, ok := m.(Externaler)
if !ok {
return plugin.Error(pluginName, errors.New("kubernetes plugin does not implement the Externaler interface"))
}
e.externalFunc = x.External
e.externalAddrFunc = x.ExternalAddress
e.externalServicesFunc = x.ExternalServices
e.externalSerialFunc = x.ExternalSerial
return nil
})
e.upstream = upstream.New()
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
e.Next = next
return e
})
return nil
}
func parse(c *caddy.Controller) (*External, error) {
e := New()
for c.Next() { // external
e.Zones = plugin.OriginsFromArgsOrServerBlock(c.RemainingArgs(), c.ServerBlockKeys)
for c.NextBlock() {
switch c.Val() {
case "ttl":
args := c.RemainingArgs()
if len(args) == 0 {
return nil, c.ArgErr()
}
t, err := strconv.Atoi(args[0])
if err != nil {
return nil, err
}
if t < 0 || t > 3600 {
return nil, c.Errf("ttl must be in range [0, 3600]: %d", t)
}
e.ttl = uint32(t)
case "apex":
args := c.RemainingArgs()
if len(args) == 0 {
return nil, c.ArgErr()
}
e.apex = args[0]
case "headless":
e.headless = true
case "fallthrough":
e.Fall.SetZonesFromArgs(c.RemainingArgs())
default:
return nil, c.Errf("unknown property '%s'", c.Val())
}
}
}
return e, nil
}
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