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|
package etcd
import (
"crypto/tls"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
mwtls "github.com/coredns/coredns/plugin/pkg/tls"
"github.com/coredns/coredns/plugin/pkg/upstream"
"github.com/caddyserver/caddy"
etcdcv3 "go.etcd.io/etcd/clientv3"
)
func init() { plugin.Register("etcd", setup) }
func setup(c *caddy.Controller) error {
e, err := etcdParse(c)
if err != nil {
return plugin.Error("etcd", err)
}
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
e.Next = next
return e
})
return nil
}
func etcdParse(c *caddy.Controller) (*Etcd, error) {
etc := Etcd{PathPrefix: "skydns"}
var (
tlsConfig *tls.Config
err error
endpoints = []string{defaultEndpoint}
username string
password string
)
etc.Upstream = upstream.New()
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()
}
for c.NextBlock() {
switch c.Val() {
case "stubzones":
// ignored, remove later.
case "fallthrough":
etc.Fall.SetZonesFromArgs(c.RemainingArgs())
case "debug":
/* it is a noop now */
case "path":
if !c.NextArg() {
return &Etcd{}, c.ArgErr()
}
etc.PathPrefix = c.Val()
case "endpoint":
args := c.RemainingArgs()
if len(args) == 0 {
return &Etcd{}, c.ArgErr()
}
endpoints = args
case "upstream":
// remove soon
c.RemainingArgs()
case "tls": // cert key cacertfile
args := c.RemainingArgs()
tlsConfig, err = mwtls.NewTLSConfigFromArgs(args...)
if err != nil {
return &Etcd{}, err
}
case "credentials":
args := c.RemainingArgs()
if len(args) == 0 {
return &Etcd{}, c.ArgErr()
}
if len(args) != 2 {
return &Etcd{}, c.Errf("credentials requires 2 arguments, username and password")
}
username, password = args[0], args[1]
default:
if c.Val() != "}" {
return &Etcd{}, c.Errf("unknown property '%s'", c.Val())
}
}
}
client, err := newEtcdClient(endpoints, tlsConfig, username, password)
if err != nil {
return &Etcd{}, err
}
etc.Client = client
etc.endpoints = endpoints
return &etc, nil
}
return &Etcd{}, nil
}
func newEtcdClient(endpoints []string, cc *tls.Config, username, password string) (*etcdcv3.Client, error) {
etcdCfg := etcdcv3.Config{
Endpoints: endpoints,
TLS: cc,
}
if username != "" && password != "" {
etcdCfg.Username = username
etcdCfg.Password = password
}
cli, err := etcdcv3.New(etcdCfg)
if err != nil {
return nil, err
}
return cli, nil
}
const defaultEndpoint = "http://localhost:2379"
|
