vendor/github.com/coreos/etcd/etcdmain/etcd.go - cloudstack-kubernetes-provider - Git at Google

 // Copyright 2015 The etcd Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 package etcdmain

 import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
 	"net/http"
 	"os"
 	"path/filepath"
 	"reflect"
 	"runtime"
 	"strings"
 	"time"

 	"github.com/coreos/etcd/discovery"
 	"github.com/coreos/etcd/embed"
 	"github.com/coreos/etcd/etcdserver"
 	"github.com/coreos/etcd/etcdserver/api/etcdhttp"
 	"github.com/coreos/etcd/pkg/cors"
 	"github.com/coreos/etcd/pkg/fileutil"
 	pkgioutil "github.com/coreos/etcd/pkg/ioutil"
 	"github.com/coreos/etcd/pkg/osutil"
 	"github.com/coreos/etcd/pkg/transport"
 	"github.com/coreos/etcd/pkg/types"
 	"github.com/coreos/etcd/proxy/httpproxy"
 	"github.com/coreos/etcd/version"

 	"github.com/coreos/pkg/capnslog"
 	"google.golang.org/grpc"
 )

 type dirType string

 var plog = capnslog.NewPackageLogger("github.com/coreos/etcd", "etcdmain")

 var (
 	dirMember = dirType("member")
 	dirProxy  = dirType("proxy")
 	dirEmpty  = dirType("empty")
 )

 func startEtcdOrProxyV2() {
 	grpc.EnableTracing = false

 	cfg := newConfig()
 	defaultInitialCluster := cfg.ec.InitialCluster

 	err := cfg.parse(os.Args[1:])
 	if err != nil {
 		plog.Errorf("error verifying flags, %v. See 'etcd --help'.", err)
 		switch err {
 		case embed.ErrUnsetAdvertiseClientURLsFlag:
 			plog.Errorf("When listening on specific address(es), this etcd process must advertise accessible url(s) to each connected client.")
 		}
 		os.Exit(1)
 	}
 	cfg.ec.SetupLogging()

 	var stopped <-chan struct{}
 	var errc <-chan error

 	plog.Infof("etcd Version: %s\n", version.Version)
 	plog.Infof("Git SHA: %s\n", version.GitSHA)
 	plog.Infof("Go Version: %s\n", runtime.Version())
 	plog.Infof("Go OS/Arch: %s/%s\n", runtime.GOOS, runtime.GOARCH)

 	GoMaxProcs := runtime.GOMAXPROCS(0)
 	plog.Infof("setting maximum number of CPUs to %d, total number of available CPUs is %d", GoMaxProcs, runtime.NumCPU())

 	defaultHost, dhErr := (&cfg.ec).UpdateDefaultClusterFromName(defaultInitialCluster)
 	if defaultHost != "" {
 		plog.Infof("advertising using detected default host %q", defaultHost)
 	}
 	if dhErr != nil {
 		plog.Noticef("failed to detect default host (%v)", dhErr)
 	}

 	if cfg.ec.Dir == "" {
 		cfg.ec.Dir = fmt.Sprintf("%v.etcd", cfg.ec.Name)
 		plog.Warningf("no data-dir provided, using default data-dir ./%s", cfg.ec.Dir)
 	}

 	which := identifyDataDirOrDie(cfg.ec.Dir)
 	if which != dirEmpty {
 		plog.Noticef("the server is already initialized as %v before, starting as etcd %v...", which, which)
 		switch which {
 		case dirMember:
 			stopped, errc, err = startEtcd(&cfg.ec)
 		case dirProxy:
 			err = startProxy(cfg)
 		default:
 			plog.Panicf("unhandled dir type %v", which)
 		}
 	} else {
 		shouldProxy := cfg.isProxy()
 		if !shouldProxy {
 			stopped, errc, err = startEtcd(&cfg.ec)
 			if derr, ok := err.(*etcdserver.DiscoveryError); ok && derr.Err == discovery.ErrFullCluster {
 				if cfg.shouldFallbackToProxy() {
 					plog.Noticef("discovery cluster full, falling back to %s", fallbackFlagProxy)
 					shouldProxy = true
 				}
 			}
 		}
 		if shouldProxy {
 			err = startProxy(cfg)
 		}
 	}

 	if err != nil {
 		if derr, ok := err.(*etcdserver.DiscoveryError); ok {
 			switch derr.Err {
 			case discovery.ErrDuplicateID:
 				plog.Errorf("member %q has previously registered with discovery service token (%s).", cfg.ec.Name, cfg.ec.Durl)
 				plog.Errorf("But etcd could not find valid cluster configuration in the given data dir (%s).", cfg.ec.Dir)
 				plog.Infof("Please check the given data dir path if the previous bootstrap succeeded")
 				plog.Infof("or use a new discovery token if the previous bootstrap failed.")
 			case discovery.ErrDuplicateName:
 				plog.Errorf("member with duplicated name has registered with discovery service token(%s).", cfg.ec.Durl)
 				plog.Errorf("please check (cURL) the discovery token for more information.")
 				plog.Errorf("please do not reuse the discovery token and generate a new one to bootstrap the cluster.")
 			default:
 				plog.Errorf("%v", err)
 				plog.Infof("discovery token %s was used, but failed to bootstrap the cluster.", cfg.ec.Durl)
 				plog.Infof("please generate a new discovery token and try to bootstrap again.")
 			}
 			os.Exit(1)
 		}

 		if strings.Contains(err.Error(), "include") && strings.Contains(err.Error(), "--initial-cluster") {
 			plog.Infof("%v", err)
 			if cfg.ec.InitialCluster == cfg.ec.InitialClusterFromName(cfg.ec.Name) {
 				plog.Infof("forgot to set --initial-cluster flag?")
 			}
 			if types.URLs(cfg.ec.APUrls).String() == embed.DefaultInitialAdvertisePeerURLs {
 				plog.Infof("forgot to set --initial-advertise-peer-urls flag?")
 			}
 			if cfg.ec.InitialCluster == cfg.ec.InitialClusterFromName(cfg.ec.Name) && len(cfg.ec.Durl) == 0 {
 				plog.Infof("if you want to use discovery service, please set --discovery flag.")
 			}
 			os.Exit(1)
 		}
 		plog.Fatalf("%v", err)
 	}

 	osutil.HandleInterrupts()

 	// At this point, the initialization of etcd is done.
 	// The listeners are listening on the TCP ports and ready
 	// for accepting connections. The etcd instance should be
 	// joined with the cluster and ready to serve incoming
 	// connections.
 	notifySystemd()

 	select {
 	case lerr := <-errc:
 		// fatal out on listener errors
 		plog.Fatal(lerr)
 	case <-stopped:
 	}

 	osutil.Exit(0)
 }

 // startEtcd runs StartEtcd in addition to hooks needed for standalone etcd.
 func startEtcd(cfg *embed.Config) (<-chan struct{}, <-chan error, error) {
 	e, err := embed.StartEtcd(cfg)
 	if err != nil {
 		return nil, nil, err
 	}
 	osutil.RegisterInterruptHandler(e.Close)
 	select {
 	case <-e.Server.ReadyNotify(): // wait for e.Server to join the cluster
 	case <-e.Server.StopNotify(): // publish aborted from 'ErrStopped'
 	}
 	return e.Server.StopNotify(), e.Err(), nil
 }

 // 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!")

 	clientTLSInfo := cfg.ec.ClientTLSInfo
 	if clientTLSInfo.Empty() {
 		// Support old proxy behavior of defaulting to PeerTLSInfo
 		// for both client and peer connections.
 		clientTLSInfo = cfg.ec.PeerTLSInfo
 	}
 	clientTLSInfo.InsecureSkipVerify = cfg.ec.ClientAutoTLS
 	cfg.ec.PeerTLSInfo.InsecureSkipVerify = cfg.ec.PeerAutoTLS

 	pt, err := transport.NewTimeoutTransport(clientTLSInfo, time.Duration(cfg.cp.ProxyDialTimeoutMs)*time.Millisecond, time.Duration(cfg.cp.ProxyReadTimeoutMs)*time.Millisecond, time.Duration(cfg.cp.ProxyWriteTimeoutMs)*time.Millisecond)
 	if err != nil {
 		return err
 	}
 	pt.MaxIdleConnsPerHost = httpproxy.DefaultMaxIdleConnsPerHost

 	if err = cfg.ec.PeerSelfCert(); err != nil {
 		plog.Fatalf("could not get certs (%v)", err)
 	}
 	tr, err := transport.NewTimeoutTransport(cfg.ec.PeerTLSInfo, time.Duration(cfg.cp.ProxyDialTimeoutMs)*time.Millisecond, time.Duration(cfg.cp.ProxyReadTimeoutMs)*time.Millisecond, time.Duration(cfg.cp.ProxyWriteTimeoutMs)*time.Millisecond)
 	if err != nil {
 		return err
 	}

 	cfg.ec.Dir = filepath.Join(cfg.ec.Dir, "proxy")
 	err = os.MkdirAll(cfg.ec.Dir, fileutil.PrivateDirMode)
 	if err != nil {
 		return err
 	}

 	var peerURLs []string
 	clusterfile := filepath.Join(cfg.ec.Dir, "cluster")

 	b, err := ioutil.ReadFile(clusterfile)
 	switch {
 	case err == nil:
 		if cfg.ec.Durl != "" {
 			plog.Warningf("discovery token ignored since the proxy has already been initialized. Valid cluster file found at %q", clusterfile)
 		}
 		if cfg.ec.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.ec.PeerURLsMapAndToken("proxy")
 		if err != nil {
 			return fmt.Errorf("error setting up initial cluster: %v", err)
 		}

 		if cfg.ec.Durl != "" {
 			var s string
 			s, err = discovery.GetCluster(cfg.ec.Durl, cfg.ec.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.cp.ProxyFailureWaitMs)*time.Millisecond, time.Duration(cfg.cp.ProxyRefreshIntervalMs)*time.Millisecond)
 	ph = &cors.CORSHandler{
 		Handler: ph,
 		Info:    cfg.ec.CorsInfo,
 	}

 	if cfg.isReadonlyProxy() {
 		ph = httpproxy.NewReadonlyHandler(ph)
 	}

 	// setup self signed certs when serving https
 	cHosts, cTLS := []string{}, false
 	for _, u := range cfg.ec.LCUrls {
 		cHosts = append(cHosts, u.Host)
 		cTLS = cTLS || u.Scheme == "https"
 	}
 	for _, u := range cfg.ec.ACUrls {
 		cHosts = append(cHosts, u.Host)
 		cTLS = cTLS || u.Scheme == "https"
 	}
 	listenerTLS := cfg.ec.ClientTLSInfo
 	if cfg.ec.ClientAutoTLS && cTLS {
 		listenerTLS, err = transport.SelfCert(filepath.Join(cfg.ec.Dir, "clientCerts"), cHosts)
 		if err != nil {
 			plog.Fatalf("proxy: could not initialize self-signed client certs (%v)", err)
 		}
 	}

 	// Start a proxy server goroutine for each listen address
 	for _, u := range cfg.ec.LCUrls {
 		l, err := transport.NewListener(u.Host, u.Scheme, &listenerTLS)
 		if err != nil {
 			return err
 		}

 		host := u.String()
 		go func() {
 			plog.Info("proxy: listening for client requests on ", host)
 			mux := http.NewServeMux()
 			etcdhttp.HandlePrometheus(mux) // v2 proxy just uses the same port
 			mux.Handle("/", ph)
 			plog.Fatal(http.Serve(l, mux))
 		}()
 	}
 	return nil
 }

 // identifyDataDirOrDie returns the type of the data dir.
 // Dies if the datadir is invalid.
 func identifyDataDirOrDie(dir string) dirType {
 	names, err := fileutil.ReadDir(dir)
 	if err != nil {
 		if os.IsNotExist(err) {
 			return dirEmpty
 		}
 		plog.Fatalf("error listing data dir: %s", dir)
 	}

 	var m, p bool
 	for _, name := range names {
 		switch dirType(name) {
 		case dirMember:
 			m = true
 		case dirProxy:
 			p = true
 		default:
 			plog.Warningf("found invalid file/dir %s under data dir %s (Ignore this if you are upgrading etcd)", name, dir)
 		}
 	}

 	if m && p {
 		plog.Fatal("invalid datadir. Both member and proxy directories exist.")
 	}
 	if m {
 		return dirMember
 	}
 	if p {
 		return dirProxy
 	}
 	return dirEmpty
 }

 func checkSupportArch() {
 	// TODO qualify arm64
 	if runtime.GOARCH == "amd64" || runtime.GOARCH == "ppc64le" {
 		return
 	}
 	// unsupported arch only configured via environment variable
 	// so unset here to not parse through flag
 	defer os.Unsetenv("ETCD_UNSUPPORTED_ARCH")
 	if env, ok := os.LookupEnv("ETCD_UNSUPPORTED_ARCH"); ok && env == runtime.GOARCH {
 		plog.Warningf("running etcd on unsupported architecture %q since ETCD_UNSUPPORTED_ARCH is set", env)
 		return
 	}
 	plog.Errorf("etcd on unsupported platform without ETCD_UNSUPPORTED_ARCH=%s set.", runtime.GOARCH)
 	os.Exit(1)
 }
	// Copyright 2015 The etcd Authors
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	package etcdmain

	import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"os"
	"path/filepath"
	"reflect"
	"runtime"
	"strings"
	"time"

	"github.com/coreos/etcd/discovery"
	"github.com/coreos/etcd/embed"
	"github.com/coreos/etcd/etcdserver"
	"github.com/coreos/etcd/etcdserver/api/etcdhttp"
	"github.com/coreos/etcd/pkg/cors"
	"github.com/coreos/etcd/pkg/fileutil"
	pkgioutil "github.com/coreos/etcd/pkg/ioutil"
	"github.com/coreos/etcd/pkg/osutil"
	"github.com/coreos/etcd/pkg/transport"
	"github.com/coreos/etcd/pkg/types"
	"github.com/coreos/etcd/proxy/httpproxy"
	"github.com/coreos/etcd/version"

	"github.com/coreos/pkg/capnslog"
	"google.golang.org/grpc"
	)

	type dirType string

	var plog = capnslog.NewPackageLogger("github.com/coreos/etcd", "etcdmain")

	var (
	dirMember = dirType("member")
	dirProxy = dirType("proxy")
	dirEmpty = dirType("empty")
	)

	func startEtcdOrProxyV2() {
	grpc.EnableTracing = false

	cfg := newConfig()
	defaultInitialCluster := cfg.ec.InitialCluster

	err := cfg.parse(os.Args[1:])
	if err != nil {
	plog.Errorf("error verifying flags, %v. See 'etcd --help'.", err)
	switch err {
	case embed.ErrUnsetAdvertiseClientURLsFlag:
	plog.Errorf("When listening on specific address(es), this etcd process must advertise accessible url(s) to each connected client.")
	}
	os.Exit(1)
	}
	cfg.ec.SetupLogging()

	var stopped <-chan struct{}
	var errc <-chan error

	plog.Infof("etcd Version: %s\n", version.Version)
	plog.Infof("Git SHA: %s\n", version.GitSHA)
	plog.Infof("Go Version: %s\n", runtime.Version())
	plog.Infof("Go OS/Arch: %s/%s\n", runtime.GOOS, runtime.GOARCH)

	GoMaxProcs := runtime.GOMAXPROCS(0)
	plog.Infof("setting maximum number of CPUs to %d, total number of available CPUs is %d", GoMaxProcs, runtime.NumCPU())

	defaultHost, dhErr := (&cfg.ec).UpdateDefaultClusterFromName(defaultInitialCluster)
	if defaultHost != "" {
	plog.Infof("advertising using detected default host %q", defaultHost)
	}
	if dhErr != nil {
	plog.Noticef("failed to detect default host (%v)", dhErr)
	}

	if cfg.ec.Dir == "" {
	cfg.ec.Dir = fmt.Sprintf("%v.etcd", cfg.ec.Name)
	plog.Warningf("no data-dir provided, using default data-dir ./%s", cfg.ec.Dir)
	}

	which := identifyDataDirOrDie(cfg.ec.Dir)
	if which != dirEmpty {
	plog.Noticef("the server is already initialized as %v before, starting as etcd %v...", which, which)
	switch which {
	case dirMember:
	stopped, errc, err = startEtcd(&cfg.ec)
	case dirProxy:
	err = startProxy(cfg)
	default:
	plog.Panicf("unhandled dir type %v", which)
	}
	} else {
	shouldProxy := cfg.isProxy()
	if !shouldProxy {
	stopped, errc, err = startEtcd(&cfg.ec)
	if derr, ok := err.(*etcdserver.DiscoveryError); ok && derr.Err == discovery.ErrFullCluster {
	if cfg.shouldFallbackToProxy() {
	plog.Noticef("discovery cluster full, falling back to %s", fallbackFlagProxy)
	shouldProxy = true
	}
	}
	}
	if shouldProxy {
	err = startProxy(cfg)
	}
	}

	if err != nil {
	if derr, ok := err.(*etcdserver.DiscoveryError); ok {
	switch derr.Err {
	case discovery.ErrDuplicateID:
	plog.Errorf("member %q has previously registered with discovery service token (%s).", cfg.ec.Name, cfg.ec.Durl)
	plog.Errorf("But etcd could not find valid cluster configuration in the given data dir (%s).", cfg.ec.Dir)
	plog.Infof("Please check the given data dir path if the previous bootstrap succeeded")
	plog.Infof("or use a new discovery token if the previous bootstrap failed.")
	case discovery.ErrDuplicateName:
	plog.Errorf("member with duplicated name has registered with discovery service token(%s).", cfg.ec.Durl)
	plog.Errorf("please check (cURL) the discovery token for more information.")
	plog.Errorf("please do not reuse the discovery token and generate a new one to bootstrap the cluster.")
	default:
	plog.Errorf("%v", err)
	plog.Infof("discovery token %s was used, but failed to bootstrap the cluster.", cfg.ec.Durl)
	plog.Infof("please generate a new discovery token and try to bootstrap again.")
	}
	os.Exit(1)
	}

	if strings.Contains(err.Error(), "include") && strings.Contains(err.Error(), "--initial-cluster") {
	plog.Infof("%v", err)
	if cfg.ec.InitialCluster == cfg.ec.InitialClusterFromName(cfg.ec.Name) {
	plog.Infof("forgot to set --initial-cluster flag?")
	}
	if types.URLs(cfg.ec.APUrls).String() == embed.DefaultInitialAdvertisePeerURLs {
	plog.Infof("forgot to set --initial-advertise-peer-urls flag?")
	}
	if cfg.ec.InitialCluster == cfg.ec.InitialClusterFromName(cfg.ec.Name) && len(cfg.ec.Durl) == 0 {
	plog.Infof("if you want to use discovery service, please set --discovery flag.")
	}
	os.Exit(1)
	}
	plog.Fatalf("%v", err)
	}

	osutil.HandleInterrupts()

	// At this point, the initialization of etcd is done.
	// The listeners are listening on the TCP ports and ready
	// for accepting connections. The etcd instance should be
	// joined with the cluster and ready to serve incoming
	// connections.
	notifySystemd()

	select {
	case lerr := <-errc:
	// fatal out on listener errors
	plog.Fatal(lerr)
	case <-stopped:
	}

	osutil.Exit(0)
	}

	// startEtcd runs StartEtcd in addition to hooks needed for standalone etcd.
	func startEtcd(cfg *embed.Config) (<-chan struct{}, <-chan error, error) {
	e, err := embed.StartEtcd(cfg)
	if err != nil {
	return nil, nil, err
	}
	osutil.RegisterInterruptHandler(e.Close)
	select {
	case <-e.Server.ReadyNotify(): // wait for e.Server to join the cluster
	case <-e.Server.StopNotify(): // publish aborted from 'ErrStopped'
	}
	return e.Server.StopNotify(), e.Err(), nil
	}

	// 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!")

	clientTLSInfo := cfg.ec.ClientTLSInfo
	if clientTLSInfo.Empty() {
	// Support old proxy behavior of defaulting to PeerTLSInfo
	// for both client and peer connections.
	clientTLSInfo = cfg.ec.PeerTLSInfo
	}
	clientTLSInfo.InsecureSkipVerify = cfg.ec.ClientAutoTLS
	cfg.ec.PeerTLSInfo.InsecureSkipVerify = cfg.ec.PeerAutoTLS

	pt, err := transport.NewTimeoutTransport(clientTLSInfo, time.Duration(cfg.cp.ProxyDialTimeoutMs)time.Millisecond, time.Duration(cfg.cp.ProxyReadTimeoutMs)time.Millisecond, time.Duration(cfg.cp.ProxyWriteTimeoutMs)*time.Millisecond)
	if err != nil {
	return err
	}
	pt.MaxIdleConnsPerHost = httpproxy.DefaultMaxIdleConnsPerHost

	if err = cfg.ec.PeerSelfCert(); err != nil {
	plog.Fatalf("could not get certs (%v)", err)
	}
	tr, err := transport.NewTimeoutTransport(cfg.ec.PeerTLSInfo, time.Duration(cfg.cp.ProxyDialTimeoutMs)time.Millisecond, time.Duration(cfg.cp.ProxyReadTimeoutMs)time.Millisecond, time.Duration(cfg.cp.ProxyWriteTimeoutMs)*time.Millisecond)
	if err != nil {
	return err
	}

	cfg.ec.Dir = filepath.Join(cfg.ec.Dir, "proxy")
	err = os.MkdirAll(cfg.ec.Dir, fileutil.PrivateDirMode)
	if err != nil {
	return err
	}

	var peerURLs []string
	clusterfile := filepath.Join(cfg.ec.Dir, "cluster")

	b, err := ioutil.ReadFile(clusterfile)
	switch {
	case err == nil:
	if cfg.ec.Durl != "" {
	plog.Warningf("discovery token ignored since the proxy has already been initialized. Valid cluster file found at %q", clusterfile)
	}
	if cfg.ec.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.ec.PeerURLsMapAndToken("proxy")
	if err != nil {
	return fmt.Errorf("error setting up initial cluster: %v", err)
	}

	if cfg.ec.Durl != "" {
	var s string
	s, err = discovery.GetCluster(cfg.ec.Durl, cfg.ec.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.cp.ProxyFailureWaitMs)time.Millisecond, time.Duration(cfg.cp.ProxyRefreshIntervalMs)time.Millisecond)
	ph = &cors.CORSHandler{
	Handler: ph,
	Info: cfg.ec.CorsInfo,
	}

	if cfg.isReadonlyProxy() {
	ph = httpproxy.NewReadonlyHandler(ph)
	}

	// setup self signed certs when serving https
	cHosts, cTLS := []string{}, false
	for _, u := range cfg.ec.LCUrls {
	cHosts = append(cHosts, u.Host)
	cTLS = cTLS \|\| u.Scheme == "https"
	}
	for _, u := range cfg.ec.ACUrls {
	cHosts = append(cHosts, u.Host)
	cTLS = cTLS \|\| u.Scheme == "https"
	}
	listenerTLS := cfg.ec.ClientTLSInfo
	if cfg.ec.ClientAutoTLS && cTLS {
	listenerTLS, err = transport.SelfCert(filepath.Join(cfg.ec.Dir, "clientCerts"), cHosts)
	if err != nil {
	plog.Fatalf("proxy: could not initialize self-signed client certs (%v)", err)
	}
	}

	// Start a proxy server goroutine for each listen address
	for _, u := range cfg.ec.LCUrls {
	l, err := transport.NewListener(u.Host, u.Scheme, &listenerTLS)
	if err != nil {
	return err
	}

	host := u.String()
	go func() {
	plog.Info("proxy: listening for client requests on ", host)
	mux := http.NewServeMux()
	etcdhttp.HandlePrometheus(mux) // v2 proxy just uses the same port
	mux.Handle("/", ph)
	plog.Fatal(http.Serve(l, mux))
	}()
	}
	return nil
	}

	// identifyDataDirOrDie returns the type of the data dir.
	// Dies if the datadir is invalid.
	func identifyDataDirOrDie(dir string) dirType {
	names, err := fileutil.ReadDir(dir)
	if err != nil {
	if os.IsNotExist(err) {
	return dirEmpty
	}
	plog.Fatalf("error listing data dir: %s", dir)
	}

	var m, p bool
	for _, name := range names {
	switch dirType(name) {
	case dirMember:
	m = true
	case dirProxy:
	p = true
	default:
	plog.Warningf("found invalid file/dir %s under data dir %s (Ignore this if you are upgrading etcd)", name, dir)
	}
	}

	if m && p {
	plog.Fatal("invalid datadir. Both member and proxy directories exist.")
	}
	if m {
	return dirMember
	}
	if p {
	return dirProxy
	}
	return dirEmpty
	}

	func checkSupportArch() {
	// TODO qualify arm64
	if runtime.GOARCH == "amd64" \|\| runtime.GOARCH == "ppc64le" {
	return
	}
	// unsupported arch only configured via environment variable
	// so unset here to not parse through flag
	defer os.Unsetenv("ETCD_UNSUPPORTED_ARCH")
	if env, ok := os.LookupEnv("ETCD_UNSUPPORTED_ARCH"); ok && env == runtime.GOARCH {
	plog.Warningf("running etcd on unsupported architecture %q since ETCD_UNSUPPORTED_ARCH is set", env)
	return
	}
	plog.Errorf("etcd on unsupported platform without ETCD_UNSUPPORTED_ARCH=%s set.", runtime.GOARCH)
	os.Exit(1)
	}