392 lines
10 KiB
Go
392 lines
10 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package etcdmain
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"log"
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"net"
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"net/http"
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"os"
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"path"
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"reflect"
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"strings"
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"time"
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"github.com/coreos/etcd/discovery"
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"github.com/coreos/etcd/etcdserver"
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"github.com/coreos/etcd/etcdserver/etcdhttp"
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"github.com/coreos/etcd/pkg/cors"
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"github.com/coreos/etcd/pkg/fileutil"
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"github.com/coreos/etcd/pkg/osutil"
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"github.com/coreos/etcd/pkg/transport"
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"github.com/coreos/etcd/pkg/types"
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"github.com/coreos/etcd/proxy"
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"github.com/coreos/etcd/rafthttp"
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)
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type dirType string
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const (
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// the owner can make/remove files inside the directory
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privateDirMode = 0700
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)
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var (
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dirMember = dirType("member")
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dirProxy = dirType("proxy")
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dirEmpty = dirType("empty")
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)
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func Main() {
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cfg := NewConfig()
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err := cfg.Parse(os.Args[1:])
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if err != nil {
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log.Printf("etcd: error verifying flags, %v. See 'etcd -help'.", err)
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os.Exit(2)
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}
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var stopped <-chan struct{}
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if cfg.name != defaultName && cfg.initialCluster == initialClusterFromName(defaultName) {
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cfg.initialCluster = initialClusterFromName(cfg.name)
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}
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if cfg.dir == "" {
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cfg.dir = fmt.Sprintf("%v.etcd", cfg.name)
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log.Printf("etcd: no data-dir provided, using default data-dir ./%s", cfg.dir)
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}
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which := identifyDataDirOrDie(cfg.dir)
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if which != dirEmpty {
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log.Printf("etcd: already initialized as %v before, starting as etcd %v...", which, which)
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}
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shouldProxy := cfg.isProxy() || which == dirProxy
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if !shouldProxy {
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stopped, err = startEtcd(cfg)
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if err == discovery.ErrFullCluster && cfg.shouldFallbackToProxy() {
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log.Printf("etcd: discovery cluster full, falling back to %s", fallbackFlagProxy)
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shouldProxy = true
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}
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}
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if shouldProxy {
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err = startProxy(cfg)
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}
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if err != nil {
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switch err {
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case discovery.ErrDuplicateID:
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log.Fatalf("etcd: member %s has previously registered with discovery service (%s), but the data-dir (%s) on disk cannot be found.",
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cfg.name, cfg.durl, cfg.dir)
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default:
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log.Fatalf("etcd: %v", err)
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}
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}
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osutil.HandleInterrupts()
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<-stopped
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osutil.Exit(0)
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}
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// startEtcd launches the etcd server and HTTP handlers for client/server communication.
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func startEtcd(cfg *config) (<-chan struct{}, error) {
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cls, err := setupCluster(cfg)
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if err != nil {
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return nil, fmt.Errorf("error setting up initial cluster: %v", err)
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}
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pt, err := transport.NewTimeoutTransport(cfg.peerTLSInfo, rafthttp.DialTimeout, rafthttp.ConnReadTimeout, rafthttp.ConnWriteTimeout)
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if err != nil {
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return nil, err
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}
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if !cfg.peerTLSInfo.Empty() {
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log.Printf("etcd: peerTLS: %s", cfg.peerTLSInfo)
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}
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plns := make([]net.Listener, 0)
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for _, u := range cfg.lpurls {
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var l net.Listener
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l, err = transport.NewTimeoutListener(u.Host, u.Scheme, cfg.peerTLSInfo, rafthttp.ConnReadTimeout, rafthttp.ConnWriteTimeout)
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if err != nil {
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return nil, err
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}
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urlStr := u.String()
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log.Print("etcd: listening for peers on ", urlStr)
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defer func() {
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if err != nil {
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l.Close()
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log.Print("etcd: stopping listening for peers on ", urlStr)
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}
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}()
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plns = append(plns, l)
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}
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if !cfg.clientTLSInfo.Empty() {
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log.Printf("etcd: clientTLS: %s", cfg.clientTLSInfo)
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}
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clns := make([]net.Listener, 0)
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for _, u := range cfg.lcurls {
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var l net.Listener
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l, err = transport.NewKeepAliveListener(u.Host, u.Scheme, cfg.clientTLSInfo)
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if err != nil {
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return nil, err
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}
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urlStr := u.String()
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log.Print("etcd: listening for client requests on ", urlStr)
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defer func() {
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if err != nil {
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l.Close()
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log.Print("etcd: stopping listening for client requests on ", urlStr)
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}
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}()
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clns = append(clns, l)
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}
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srvcfg := &etcdserver.ServerConfig{
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Name: cfg.name,
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ClientURLs: cfg.acurls,
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PeerURLs: cfg.apurls,
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DataDir: cfg.dir,
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SnapCount: cfg.snapCount,
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MaxSnapFiles: cfg.maxSnapFiles,
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MaxWALFiles: cfg.maxWalFiles,
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Cluster: cls,
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DiscoveryURL: cfg.durl,
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DiscoveryProxy: cfg.dproxy,
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NewCluster: cfg.isNewCluster(),
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ForceNewCluster: cfg.forceNewCluster,
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Transport: pt,
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TickMs: cfg.TickMs,
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ElectionTicks: cfg.electionTicks(),
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}
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var s *etcdserver.EtcdServer
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s, err = etcdserver.NewServer(srvcfg)
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if err != nil {
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return nil, err
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}
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s.Start()
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osutil.RegisterInterruptHandler(s.Stop)
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if cfg.corsInfo.String() != "" {
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log.Printf("etcd: cors = %s", cfg.corsInfo)
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}
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ch := &cors.CORSHandler{
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Handler: etcdhttp.NewClientHandler(s),
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Info: cfg.corsInfo,
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}
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ph := etcdhttp.NewPeerHandler(s.Cluster, etcdserver.RaftTimer(s), s.RaftHandler())
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// Start the peer server in a goroutine
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for _, l := range plns {
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go func(l net.Listener) {
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log.Fatal(serveHTTP(l, ph, 5*time.Minute))
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}(l)
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}
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// Start a client server goroutine for each listen address
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for _, l := range clns {
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go func(l net.Listener) {
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// read timeout does not work with http close notify
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// TODO: https://github.com/golang/go/issues/9524
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log.Fatal(serveHTTP(l, ch, 0))
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}(l)
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}
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return s.StopNotify(), nil
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}
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// startProxy launches an HTTP proxy for client communication which proxies to other etcd nodes.
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func startProxy(cfg *config) error {
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cls, err := setupCluster(cfg)
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if err != nil {
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return fmt.Errorf("error setting up initial cluster: %v", err)
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}
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if cfg.durl != "" {
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s, err := discovery.GetCluster(cfg.durl, cfg.dproxy)
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if err != nil {
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return err
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}
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if cls, err = etcdserver.NewClusterFromString(cfg.durl, s); err != nil {
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return err
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}
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}
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pt, err := transport.NewTransport(cfg.clientTLSInfo)
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if err != nil {
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return err
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}
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tr, err := transport.NewTransport(cfg.peerTLSInfo)
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if err != nil {
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return err
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}
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cfg.dir = path.Join(cfg.dir, "proxy")
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err = os.MkdirAll(cfg.dir, 0700)
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if err != nil {
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return err
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}
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var peerURLs []string
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clusterfile := path.Join(cfg.dir, "cluster")
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b, err := ioutil.ReadFile(clusterfile)
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switch {
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case err == nil:
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urls := struct{ PeerURLs []string }{}
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err := json.Unmarshal(b, &urls)
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if err != nil {
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return err
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}
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peerURLs = urls.PeerURLs
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log.Printf("proxy: using peer urls %v from cluster file ./%s", peerURLs, clusterfile)
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case os.IsNotExist(err):
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peerURLs = cls.PeerURLs()
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log.Printf("proxy: using peer urls %v ", peerURLs)
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default:
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return err
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}
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uf := func() []string {
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gcls, err := etcdserver.GetClusterFromRemotePeers(peerURLs, tr)
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// TODO: remove the 2nd check when we fix GetClusterFromPeers
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// GetClusterFromPeers should not return nil error with an invaild empty cluster
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if err != nil {
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log.Printf("proxy: %v", err)
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return []string{}
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}
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if len(gcls.Members()) == 0 {
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return cls.ClientURLs()
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}
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cls = gcls
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urls := struct{ PeerURLs []string }{cls.PeerURLs()}
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b, err := json.Marshal(urls)
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if err != nil {
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log.Printf("proxy: error on marshal peer urls %s", err)
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return cls.ClientURLs()
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}
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err = ioutil.WriteFile(clusterfile+".bak", b, 0600)
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if err != nil {
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log.Printf("proxy: error on writing urls %s", err)
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return cls.ClientURLs()
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}
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err = os.Rename(clusterfile+".bak", clusterfile)
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if err != nil {
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log.Printf("proxy: error on updating clusterfile %s", err)
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return cls.ClientURLs()
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}
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if !reflect.DeepEqual(cls.PeerURLs(), peerURLs) {
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log.Printf("proxy: updated peer urls in cluster file from %v to %v", peerURLs, cls.PeerURLs())
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}
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peerURLs = cls.PeerURLs()
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return cls.ClientURLs()
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}
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ph := proxy.NewHandler(pt, uf)
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ph = &cors.CORSHandler{
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Handler: ph,
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Info: cfg.corsInfo,
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}
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if cfg.isReadonlyProxy() {
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ph = proxy.NewReadonlyHandler(ph)
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}
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// Start a proxy server goroutine for each listen address
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for _, u := range cfg.lcurls {
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l, err := transport.NewListener(u.Host, u.Scheme, cfg.clientTLSInfo)
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if err != nil {
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return err
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}
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host := u.Host
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go func() {
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log.Print("proxy: listening for client requests on ", host)
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log.Fatal(http.Serve(l, ph))
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}()
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}
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return nil
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}
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// setupCluster sets up an initial cluster definition for bootstrap or discovery.
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func setupCluster(cfg *config) (*etcdserver.Cluster, error) {
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var cls *etcdserver.Cluster
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var err error
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switch {
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case cfg.durl != "":
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// If using discovery, generate a temporary cluster based on
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// self's advertised peer URLs
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clusterStr := genClusterString(cfg.name, cfg.apurls)
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cls, err = etcdserver.NewClusterFromString(cfg.durl, clusterStr)
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case cfg.dnsCluster != "":
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clusterStr, clusterToken, err := discovery.SRVGetCluster(cfg.name, cfg.dnsCluster, cfg.initialClusterToken, cfg.apurls)
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if err != nil {
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return nil, err
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}
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cls, err = etcdserver.NewClusterFromString(clusterToken, clusterStr)
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default:
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// We're statically configured, and cluster has appropriately been set.
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cls, err = etcdserver.NewClusterFromString(cfg.initialClusterToken, cfg.initialCluster)
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}
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return cls, err
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}
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func genClusterString(name string, urls types.URLs) string {
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addrs := make([]string, 0)
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for _, u := range urls {
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addrs = append(addrs, fmt.Sprintf("%v=%v", name, u.String()))
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}
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return strings.Join(addrs, ",")
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}
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// identifyDataDirOrDie returns the type of the data dir.
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// Dies if the datadir is invalid.
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func identifyDataDirOrDie(dir string) dirType {
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names, err := fileutil.ReadDir(dir)
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if err != nil {
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if os.IsNotExist(err) {
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return dirEmpty
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}
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log.Fatalf("etcd: error listing data dir: %s", dir)
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}
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var m, p bool
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for _, name := range names {
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switch dirType(name) {
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case dirMember:
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m = true
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case dirProxy:
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p = true
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default:
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log.Printf("etcd: found invalid file/dir %s under data dir %s (Ignore this if you are upgrading etcd)", name, dir)
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}
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}
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if m && p {
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log.Fatal("etcd: invalid datadir. Both member and proxy directories exist.")
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}
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if m {
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return dirMember
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}
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if p {
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return dirProxy
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}
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return dirEmpty
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}
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