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|
package etcd
import (
"crypto/tls"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/pkg/dnsutil"
mwtls "github.com/coredns/coredns/plugin/pkg/tls"
"github.com/coredns/coredns/plugin/proxy"
etcdc "github.com/coreos/etcd/client"
"github.com/mholt/caddy"
"golang.org/x/net/context"
)
func init() {
caddy.RegisterPlugin("etcd", caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
e, stubzones, err := etcdParse(c)
if err != nil {
return plugin.Error("etcd", err)
}
if stubzones {
c.OnStartup(func() error {
e.UpdateStubZones()
return nil
})
}
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
e.Next = next
return e
})
return nil
}
func etcdParse(c *caddy.Controller) (*Etcd, bool, error) {
stub := make(map[string]proxy.Proxy)
etc := Etcd{
// Don't default to a proxy for lookups.
// Proxy: proxy.NewLookup([]string{"8.8.8.8:53", "8.8.4.4:53"}),
PathPrefix: "skydns",
Ctx: context.Background(),
Stubmap: &stub,
}
var (
tlsConfig *tls.Config
err error
endpoints = []string{defaultEndpoint}
stubzones = false
)
for c.Next() {
etc.Zones = c.RemainingArgs()
if len(etc.Zones) == 0 {
etc.Zones = make([]string, len(c.ServerBlockKeys))
copy(etc.Zones, c.ServerBlockKeys)
}
for i, str := range etc.Zones {
etc.Zones[i] = plugin.Host(str).Normalize()
}
if c.NextBlock() {
for {
switch c.Val() {
case "stubzones":
stubzones = true
case "fallthrough":
etc.Fall.SetZonesFromArgs(c.RemainingArgs())
case "debug":
/* it is a noop now */
case "path":
if !c.NextArg() {
return &Etcd{}, false, c.ArgErr()
}
etc.PathPrefix = c.Val()
case "endpoint":
args := c.RemainingArgs()
if len(args) == 0 {
return &Etcd{}, false, c.ArgErr()
}
endpoints = args
case "upstream":
args := c.RemainingArgs()
if len(args) == 0 {
return &Etcd{}, false, c.ArgErr()
}
ups, err := dnsutil.ParseHostPortOrFile(args...)
if err != nil {
return &Etcd{}, false, err
}
etc.Proxy = proxy.NewLookup(ups)
case "tls": // cert key cacertfile
args := c.RemainingArgs()
tlsConfig, err = mwtls.NewTLSConfigFromArgs(args...)
if err != nil {
return &Etcd{}, false, err
}
default:
if c.Val() != "}" {
return &Etcd{}, false, c.Errf("unknown property '%s'", c.Val())
}
}
if !c.Next() {
break
}
}
}
client, err := newEtcdClient(endpoints, tlsConfig)
if err != nil {
return &Etcd{}, false, err
}
etc.Client = client
etc.endpoints = endpoints
return &etc, stubzones, nil
}
return &Etcd{}, false, nil
}
func newEtcdClient(endpoints []string, cc *tls.Config) (etcdc.KeysAPI, error) {
etcdCfg := etcdc.Config{
Endpoints: endpoints,
Transport: mwtls.NewHTTPSTransport(cc),
}
cli, err := etcdc.New(etcdCfg)
if err != nil {
return nil, err
}
return etcdc.NewKeysAPI(cli), nil
}
const defaultEndpoint = "http://localhost:2379"
|
