Example #1
0
func TestClusterFromStore(t *testing.T) {
	tests := []struct {
		mems []*Member
	}{
		{
			[]*Member{newTestMember(1, nil, "", nil)},
		},
		{
			nil,
		},
		{
			[]*Member{
				newTestMember(1, nil, "", nil),
				newTestMember(2, nil, "", nil),
			},
		},
	}
	for i, tt := range tests {
		hc := newTestCluster(nil)
		hc.SetStore(store.New())
		for _, m := range tt.mems {
			hc.AddMember(m)
		}
		c := NewClusterFromStore("abc", hc.store)
		if c.token != "abc" {
			t.Errorf("#%d: token = %v, want %v", i, c.token, "abc")
		}
		if !reflect.DeepEqual(c.Members(), tt.mems) {
			t.Errorf("#%d: members = %v, want %v", i, c.Members(), tt.mems)
		}
	}
}
Example #2
0
// NewServer creates a new EtcdServer from the supplied configuration. The
// configuration is considered static for the lifetime of the EtcdServer.
func NewServer(cfg *ServerConfig) (*EtcdServer, error) {
	st := store.New(StoreAdminPrefix, StoreKeysPrefix)
	var w *wal.WAL
	var n raft.Node
	var s *raft.MemoryStorage
	var id types.ID

	walVersion, err := wal.DetectVersion(cfg.DataDir)
	if err != nil {
		return nil, err
	}
	if walVersion == wal.WALUnknown {
		return nil, fmt.Errorf("unknown wal version in data dir %s", cfg.DataDir)
	}
	haveWAL := walVersion != wal.WALNotExist
	ss := snap.New(cfg.SnapDir())

	switch {
	case !haveWAL && !cfg.NewCluster:
		existingCluster, err := GetClusterFromRemotePeers(getRemotePeerURLs(cfg.Cluster, cfg.Name), cfg.Transport)
		if err != nil {
			return nil, fmt.Errorf("cannot fetch cluster info from peer urls: %v", err)
		}
		if err := ValidateClusterAndAssignIDs(cfg.Cluster, existingCluster); err != nil {
			return nil, fmt.Errorf("error validating peerURLs %s: %v", existingCluster, err)
		}
		cfg.Cluster.UpdateIndex(existingCluster.index)
		cfg.Cluster.SetID(existingCluster.id)
		cfg.Cluster.SetStore(st)
		cfg.Print()
		id, n, s, w = startNode(cfg, nil)
	case !haveWAL && cfg.NewCluster:
		if err := cfg.VerifyBootstrapConfig(); err != nil {
			return nil, err
		}
		m := cfg.Cluster.MemberByName(cfg.Name)
		if isMemberBootstrapped(cfg.Cluster, cfg.Name, cfg.Transport) {
			return nil, fmt.Errorf("member %s has already been bootstrapped", m.ID)
		}
		if cfg.ShouldDiscover() {
			str, err := discovery.JoinCluster(cfg.DiscoveryURL, cfg.DiscoveryProxy, m.ID, cfg.Cluster.String())
			if err != nil {
				return nil, err
			}
			if cfg.Cluster, err = NewClusterFromString(cfg.Cluster.token, str); err != nil {
				return nil, err
			}
			if err := cfg.Cluster.Validate(); err != nil {
				return nil, fmt.Errorf("bad discovery cluster: %v", err)
			}
		}
		cfg.Cluster.SetStore(st)
		cfg.PrintWithInitial()
		id, n, s, w = startNode(cfg, cfg.Cluster.MemberIDs())
	case haveWAL:
		// Run the migrations.
		if err := upgradeWAL(cfg.DataDir, cfg.Name, walVersion); err != nil {
			return nil, err
		}

		if err := fileutil.IsDirWriteable(cfg.DataDir); err != nil {
			return nil, fmt.Errorf("cannot write to data directory: %v", err)
		}

		if err := fileutil.IsDirWriteable(cfg.MemberDir()); err != nil {
			return nil, fmt.Errorf("cannot write to member directory: %v", err)
		}

		if cfg.ShouldDiscover() {
			log.Printf("etcdserver: discovery token ignored since a cluster has already been initialized. Valid log found at %q", cfg.WALDir())
		}
		snapshot, err := ss.Load()
		if err != nil && err != snap.ErrNoSnapshot {
			return nil, err
		}
		if snapshot != nil {
			if err := st.Recovery(snapshot.Data); err != nil {
				log.Panicf("etcdserver: recovered store from snapshot error: %v", err)
			}
			log.Printf("etcdserver: recovered store from snapshot at index %d", snapshot.Metadata.Index)
		}
		cfg.Cluster = NewClusterFromStore(cfg.Cluster.token, st)
		cfg.Print()
		if snapshot != nil {
			log.Printf("etcdserver: loaded cluster information from store: %s", cfg.Cluster)
		}
		if !cfg.ForceNewCluster {
			id, n, s, w = restartNode(cfg, snapshot)
		} else {
			id, n, s, w = restartAsStandaloneNode(cfg, snapshot)
		}
	default:
		return nil, fmt.Errorf("unsupported bootstrap config")
	}

	sstats := &stats.ServerStats{
		Name: cfg.Name,
		ID:   id.String(),
	}
	lstats := stats.NewLeaderStats(id.String())

	srv := &EtcdServer{
		cfg:       cfg,
		snapCount: cfg.SnapCount,
		errorc:    make(chan error, 1),
		store:     st,
		r: raftNode{
			Node:        n,
			ticker:      time.Tick(time.Duration(cfg.TickMs) * time.Millisecond),
			raftStorage: s,
			storage:     NewStorage(w, ss),
		},
		id:         id,
		attributes: Attributes{Name: cfg.Name, ClientURLs: cfg.ClientURLs.StringSlice()},
		Cluster:    cfg.Cluster,
		stats:      sstats,
		lstats:     lstats,
		SyncTicker: time.Tick(500 * time.Millisecond),
		reqIDGen:   idutil.NewGenerator(uint8(id), time.Now()),
	}

	tr := rafthttp.NewTransporter(cfg.Transport, id, cfg.Cluster.ID(), srv, srv.errorc, sstats, lstats)
	// add all the remote members into sendhub
	for _, m := range cfg.Cluster.Members() {
		if m.ID != id {
			tr.AddPeer(m.ID, m.PeerURLs)
		}
	}
	srv.r.transport = tr
	return srv, nil
}
Example #3
0
func TestClusterValidateConfigurationChange(t *testing.T) {
	cl := newCluster("")
	cl.SetStore(store.New())
	for i := 1; i <= 4; i++ {
		attr := RaftAttributes{PeerURLs: []string{fmt.Sprintf("http://127.0.0.1:%d", i)}}
		cl.AddMember(&Member{ID: types.ID(i), RaftAttributes: attr})
	}
	cl.RemoveMember(4)

	attr := RaftAttributes{PeerURLs: []string{fmt.Sprintf("http://127.0.0.1:%d", 1)}}
	ctx, err := json.Marshal(&Member{ID: types.ID(5), RaftAttributes: attr})
	if err != nil {
		t.Fatal(err)
	}

	attr = RaftAttributes{PeerURLs: []string{fmt.Sprintf("http://127.0.0.1:%d", 5)}}
	ctx5, err := json.Marshal(&Member{ID: types.ID(5), RaftAttributes: attr})
	if err != nil {
		t.Fatal(err)
	}

	attr = RaftAttributes{PeerURLs: []string{fmt.Sprintf("http://127.0.0.1:%d", 3)}}
	ctx2to3, err := json.Marshal(&Member{ID: types.ID(2), RaftAttributes: attr})
	if err != nil {
		t.Fatal(err)
	}

	attr = RaftAttributes{PeerURLs: []string{fmt.Sprintf("http://127.0.0.1:%d", 5)}}
	ctx2to5, err := json.Marshal(&Member{ID: types.ID(2), RaftAttributes: attr})
	if err != nil {
		t.Fatal(err)
	}

	tests := []struct {
		cc   raftpb.ConfChange
		werr error
	}{
		{
			raftpb.ConfChange{
				Type:   raftpb.ConfChangeRemoveNode,
				NodeID: 3,
			},
			nil,
		},
		{
			raftpb.ConfChange{
				Type:   raftpb.ConfChangeAddNode,
				NodeID: 4,
			},
			ErrIDRemoved,
		},
		{
			raftpb.ConfChange{
				Type:   raftpb.ConfChangeRemoveNode,
				NodeID: 4,
			},
			ErrIDRemoved,
		},
		{
			raftpb.ConfChange{
				Type:   raftpb.ConfChangeAddNode,
				NodeID: 1,
			},
			ErrIDExists,
		},
		{
			raftpb.ConfChange{
				Type:    raftpb.ConfChangeAddNode,
				NodeID:  5,
				Context: ctx,
			},
			ErrPeerURLexists,
		},
		{
			raftpb.ConfChange{
				Type:   raftpb.ConfChangeRemoveNode,
				NodeID: 5,
			},
			ErrIDNotFound,
		},
		{
			raftpb.ConfChange{
				Type:    raftpb.ConfChangeAddNode,
				NodeID:  5,
				Context: ctx5,
			},
			nil,
		},
		{
			raftpb.ConfChange{
				Type:    raftpb.ConfChangeUpdateNode,
				NodeID:  5,
				Context: ctx,
			},
			ErrIDNotFound,
		},
		// try to change the peer url of 2 to the peer url of 3
		{
			raftpb.ConfChange{
				Type:    raftpb.ConfChangeUpdateNode,
				NodeID:  2,
				Context: ctx2to3,
			},
			ErrPeerURLexists,
		},
		{
			raftpb.ConfChange{
				Type:    raftpb.ConfChangeUpdateNode,
				NodeID:  2,
				Context: ctx2to5,
			},
			nil,
		},
	}
	for i, tt := range tests {
		err := cl.ValidateConfigurationChange(tt.cc)
		if err != tt.werr {
			t.Errorf("#%d: validateConfigurationChange error = %v, want %v", i, err, tt.werr)
		}
	}
}