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setup.go
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setup.go
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package etcdhosts
import (
"context"
"strconv"
"strings"
"time"
clientv3 "go.etcd.io/etcd/client/v3"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
clog "github.com/coredns/coredns/plugin/pkg/log"
mwtls "github.com/coredns/coredns/plugin/pkg/tls"
"github.com/coredns/caddy"
)
var log = clog.NewWithPlugin("etcdhosts")
func init() { plugin.Register("etcdhosts", setup) }
func setup(c *caddy.Controller) error {
h, err := hostsParse(c)
if err != nil {
return plugin.Error("etcdhosts", err)
}
updateCancel := h.periodicHostsUpdate()
c.OnStartup(func() error {
h.readEtcdHosts()
return nil
})
c.OnShutdown(func() error {
updateCancel()
return nil
})
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
h.Next = next
return h
})
return nil
}
func hostsParse(c *caddy.Controller) (*EtcdHosts, error) {
h := &EtcdHosts{
HostsFile: &HostsFile{
hmap: newMap(),
inline: newMap(),
options: newOptions(),
},
etcdConfig: &EtcdConfig{},
}
var inline []string
i := 0
for c.Next() {
if i > 0 {
return h, plugin.ErrOnce
}
i++
h.Origins = plugin.OriginsFromArgsOrServerBlock(c.RemainingArgs(), c.ServerBlockKeys)
for c.NextBlock() {
switch c.Val() {
case "fallthrough":
h.Fall.SetZonesFromArgs(c.RemainingArgs())
case "no_reverse":
h.options.autoReverse = false
case "ttl":
remaining := c.RemainingArgs()
if len(remaining) < 1 {
return h, c.Errf("ttl needs a time in second")
}
ttl, err := strconv.Atoi(remaining[0])
if err != nil {
return h, c.Errf("ttl needs a number of second")
}
if ttl <= 0 || ttl > 65535 {
return h, c.Errf("ttl provided is invalid")
}
h.options.ttl = uint32(ttl)
case "tls":
remaining := c.RemainingArgs()
tlsConfig, err := mwtls.NewTLSConfigFromArgs(remaining...)
if err != nil {
return h, c.Errf("failed to load etcd tls config: %s", err.Error())
}
h.etcdConfig.TLSConfig = tlsConfig
case "endpoint":
remaining := c.RemainingArgs()
if len(remaining) == 0 {
return h, c.ArgErr()
}
h.etcdConfig.Endpoints = remaining
case "timeout":
remaining := c.RemainingArgs()
if len(remaining) != 1 {
return h, c.Errf("timeout needs a duration")
}
timeout, err := time.ParseDuration(remaining[0])
if err != nil {
return h, c.Errf("invalid duration for timeout '%s'", remaining[0])
}
h.etcdConfig.Timeout = timeout
case "key":
remaining := c.RemainingArgs()
if len(remaining) != 1 {
return h, c.Errf("etcd hosts key needs a string")
}
h.etcdConfig.HostsKey = remaining[0]
case "credentials":
remaining := c.RemainingArgs()
if len(remaining) == 0 {
return h, c.ArgErr()
}
if len(remaining) != 2 {
return h, c.Errf("credentials requires 2 arguments, username and password")
}
h.etcdConfig.UserName, h.etcdConfig.Password = remaining[0], remaining[1]
case "force_reload":
remaining := c.RemainingArgs()
if len(remaining) != 1 {
return h, c.Errf("force_reload needs a duration")
}
forceReload, err := time.ParseDuration(remaining[0])
if err != nil {
return h, c.Errf("invalid duration for force_reload '%s'", remaining[0])
}
h.etcdConfig.ForceReload = forceReload
default:
if len(h.Fall.Zones) == 0 {
line := strings.Join(append([]string{c.Val()}, c.RemainingArgs()...), " ")
inline = append(inline, line)
continue
}
return h, c.Errf("unknown property '%s'", c.Val())
}
}
}
// default etcd key
if h.etcdConfig.HostsKey == "" {
h.etcdConfig.HostsKey = "/etcdhosts"
}
// default etcd client timeout
if h.etcdConfig.Timeout == 0 {
h.etcdConfig.Timeout = 3 * time.Second
}
// create etcd client
if err := h.initEtcdClient(); err != nil {
return nil, c.Errf("failed to create etcd client: %s", err)
}
h.initInline(inline)
return h, nil
}
func (h *EtcdHosts) periodicHostsUpdate() context.CancelFunc {
ctx, cancel := context.WithCancel(context.Background())
go func() {
reloadTick := make(<-chan time.Time)
if h.etcdConfig.ForceReload > 0 {
reloadTick = time.Tick(h.etcdConfig.ForceReload)
}
watchCh := h.etcdClient.Watch(clientv3.WithRequireLeader(context.Background()), h.etcdConfig.HostsKey)
for {
select {
case <-ctx.Done():
if err := h.closeClient(); err != nil {
log.Errorf("etcdhosts client close failed: %s", err.Error())
}
return
case <-time.Tick(1 * time.Minute):
if err := h.syncEndpoints(); err != nil {
log.Errorf("etcdhosts client sync error: %s", err.Error())
continue
}
log.Infof("etcdhosts client endpoints sync success: %v", h.etcdClient.Endpoints())
case <-reloadTick:
log.Info("etcdhosts force reloading...")
h.readEtcdHosts()
case _, ok := <-watchCh:
if !ok {
log.Error("failed to watch etcd events: channel read failed")
continue
}
log.Info("etcdhosts reloading...")
h.readEtcdHosts()
}
}
}()
return cancel
}