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etcd: persist proxy cluster to disk

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This commit is contained in:
Xiang Li 2015-01-30 15:18:26 -08:00
parent 87a8ebd222
commit dc7374c488
1 changed files with 57 additions and 3 deletions
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60
etcdmain/etcd.go
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@ -15,11 +15,15 @@
package etcdmain
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"os"
"path"
"reflect"
"strings"
"time"
@ -216,15 +220,65 @@ func startProxy(cfg *config) error {
return err
}
// TODO(jonboulle): update peerURLs dynamically (i.e. when updating
// clientURLs) instead of just using the initial fixed list here
peerURLs := cls.PeerURLs()
if cfg.dir == "" {
cfg.dir = fmt.Sprintf("%v.etcdproxy", cfg.name)
log.Printf("no proxy data-dir provided, using default proxy data-dir ./%s", cfg.dir)
}
err = os.MkdirAll(cfg.dir, 0700)
if err != nil {
return err
}
var peerURLs []string
clusterfile := path.Join(cfg.dir, "cluster")
b, err := ioutil.ReadFile(clusterfile)
switch {
case err == nil:
urls := struct{ PeerURLs []string }{}
err := json.Unmarshal(b, &urls)
if err != nil {
return err
}
peerURLs = urls.PeerURLs
log.Printf("proxy: using peer urls %v from cluster file ./%s", peerURLs, clusterfile)
case os.IsNotExist(err):
peerURLs = cls.PeerURLs()
log.Printf("proxy: using peer urls %v ", peerURLs)
default:
return err
}
uf := func() []string {
old := cls.PeerURLs()
cls, err := etcdserver.GetClusterFromPeers(peerURLs, tr)
if err != nil {
log.Printf("proxy: %v", err)
return []string{}
}
urls := struct{ PeerURLs []string }{cls.PeerURLs()}
b, err := json.Marshal(urls)
if err != nil {
log.Printf("proxy: error on marshal peer urls %s", err)
return cls.ClientURLs()
}
err = ioutil.WriteFile(clusterfile+".bak", b, 0600)
if err != nil {
log.Printf("proxy: error on writing urls %s", err)
return cls.ClientURLs()
}
err = os.Rename(clusterfile+".bak", clusterfile)
if err != nil {
log.Printf("proxy: error on updating clusterfile %s", err)
return cls.ClientURLs()
}
if !reflect.DeepEqual(cls.PeerURLs(), old) {
log.Printf("proxy: updated peer urls in cluster file from %v to %v", old, cls.PeerURLs())
}
return cls.ClientURLs()
}
ph := proxy.NewHandler(pt, uf)