func (s *Snapshotter) save(snapshot *raftpb.Snapshot) error {
start := time.Now()
fname := fmt.Sprintf("%016x-%016x%s", snapshot.Metadata.Term, snapshot.Metadata.Index, snapSuffix)
b := pbutil.MustMarshal(snapshot)
crc := crc32.Update(0, crcTable, b)
snap := snappb.Snapshot{Crc: crc, Data: b}
d, err := snap.Marshal()
if err != nil {
return err
} else {
marshallingDurations.Observe(float64(time.Since(start)) / float64(time.Second))
}
err = pioutil.WriteAndSyncFile(path.Join(s.dir, fname), d, 0666)
if err == nil {
saveDurations.Observe(float64(time.Since(start)) / float64(time.Second))
} else {
err1 := os.Remove(path.Join(s.dir, fname))
if err1 != nil {
plog.Errorf("failed to remove broken snapshot file %s", path.Join(s.dir, fname))
}
}
return err
}
// startProxy launches an HTTP proxy for client communication which proxies to other etcd nodes.
func startProxy(cfg *config) error {
plog.Notice("proxy: this proxy supports v2 API only!")
pt, err := transport.NewTimeoutTransport(cfg.PeerTLSInfo, time.Duration(cfg.ProxyDialTimeoutMs)*time.Millisecond, time.Duration(cfg.ProxyReadTimeoutMs)*time.Millisecond, time.Duration(cfg.ProxyWriteTimeoutMs)*time.Millisecond)
if err != nil {
return err
}
pt.MaxIdleConnsPerHost = httpproxy.DefaultMaxIdleConnsPerHost
tr, err := transport.NewTimeoutTransport(cfg.PeerTLSInfo, time.Duration(cfg.ProxyDialTimeoutMs)*time.Millisecond, time.Duration(cfg.ProxyReadTimeoutMs)*time.Millisecond, time.Duration(cfg.ProxyWriteTimeoutMs)*time.Millisecond)
if err != nil {
return err
}
cfg.Dir = path.Join(cfg.Dir, "proxy")
err = os.MkdirAll(cfg.Dir, fileutil.PrivateDirMode)
if err != nil {
return err
}
var peerURLs []string
clusterfile := path.Join(cfg.Dir, "cluster")
b, err := ioutil.ReadFile(clusterfile)
switch {
case err == nil:
if cfg.Durl != "" {
plog.Warningf("discovery token ignored since the proxy has already been initialized. Valid cluster file found at %q", clusterfile)
}
if cfg.DNSCluster != "" {
plog.Warningf("DNS SRV discovery ignored since the proxy has already been initialized. Valid cluster file found at %q", clusterfile)
}
urls := struct{ PeerURLs []string }{}
err = json.Unmarshal(b, &urls)
if err != nil {
return err
}
peerURLs = urls.PeerURLs
plog.Infof("proxy: using peer urls %v from cluster file %q", peerURLs, clusterfile)
case os.IsNotExist(err):
var urlsmap types.URLsMap
urlsmap, _, err = cfg.PeerURLsMapAndToken("proxy")
if err != nil {
return fmt.Errorf("error setting up initial cluster: %v", err)
}
if cfg.Durl != "" {
var s string
s, err = discovery.GetCluster(cfg.Durl, cfg.Dproxy)
if err != nil {
return err
}
if urlsmap, err = types.NewURLsMap(s); err != nil {
return err
}
}
peerURLs = urlsmap.URLs()
plog.Infof("proxy: using peer urls %v ", peerURLs)
default:
return err
}
clientURLs := []string{}
uf := func() []string {
gcls, gerr := etcdserver.GetClusterFromRemotePeers(peerURLs, tr)
if gerr != nil {
plog.Warningf("proxy: %v", gerr)
return []string{}
}
clientURLs = gcls.ClientURLs()
urls := struct{ PeerURLs []string }{gcls.PeerURLs()}
b, jerr := json.Marshal(urls)
if jerr != nil {
plog.Warningf("proxy: error on marshal peer urls %s", jerr)
return clientURLs
}
err = pkgioutil.WriteAndSyncFile(clusterfile+".bak", b, 0600)
if err != nil {
plog.Warningf("proxy: error on writing urls %s", err)
return clientURLs
}
err = os.Rename(clusterfile+".bak", clusterfile)
if err != nil {
plog.Warningf("proxy: error on updating clusterfile %s", err)
return clientURLs
}
if !reflect.DeepEqual(gcls.PeerURLs(), peerURLs) {
plog.Noticef("proxy: updated peer urls in cluster file from %v to %v", peerURLs, gcls.PeerURLs())
}
peerURLs = gcls.PeerURLs()
return clientURLs
}
ph := httpproxy.NewHandler(pt, uf, time.Duration(cfg.ProxyFailureWaitMs)*time.Millisecond, time.Duration(cfg.ProxyRefreshIntervalMs)*time.Millisecond)
ph = &cors.CORSHandler{
Handler: ph,
Info: cfg.CorsInfo,
}
if cfg.isReadonlyProxy() {
ph = httpproxy.NewReadonlyHandler(ph)
}
// Start a proxy server goroutine for each listen address
for _, u := range cfg.LCUrls {
var (
l net.Listener
tlscfg *tls.Config
)
if !cfg.ClientTLSInfo.Empty() {
tlscfg, err = cfg.ClientTLSInfo.ServerConfig()
if err != nil {
return err
}
}
l, err := transport.NewListener(u.Host, u.Scheme, tlscfg)
if err != nil {
return err
}
host := u.String()
go func() {
plog.Info("proxy: listening for client requests on ", host)
mux := http.NewServeMux()
mux.Handle("/metrics", prometheus.Handler())
mux.Handle("/", ph)
plog.Fatal(http.Serve(l, mux))
}()
}
return nil
}