Golang raftpb.ConfChange类代码示例

func (n *node) ProposeConfChange(ctx context.Context, cc pb.ConfChange) error {
	data, err := cc.Marshal()
	if err != nil {
		return err
	}
	return n.Step(ctx, pb.Message{Type: pb.MsgProp, Entries: []pb.Entry{{Type: pb.EntryConfChange, Data: data}}})
}

// TestMultiNodeStart ensures that a node can be started correctly. The node should
// start with correct configuration change entries, and can accept and commit
// proposals.
func TestMultiNodeStart(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	cc := raftpb.ConfChange{Type: raftpb.ConfChangeAddNode, NodeID: 1}
	ccdata, err := cc.Marshal()
	if err != nil {
		t.Fatalf("unexpected marshal error: %v", err)
	}
	wants := []Ready{
		{
			SoftState: &SoftState{Lead: 1, RaftState: StateLeader},
			HardState: raftpb.HardState{Term: 2, Commit: 2, Vote: 1},
			Entries: []raftpb.Entry{
				{Type: raftpb.EntryConfChange, Term: 1, Index: 1, Data: ccdata},
				{Term: 2, Index: 2},
			},
			CommittedEntries: []raftpb.Entry{
				{Type: raftpb.EntryConfChange, Term: 1, Index: 1, Data: ccdata},
				{Term: 2, Index: 2},
			},
		},
		{
			HardState:        raftpb.HardState{Term: 2, Commit: 3, Vote: 1},
			Entries:          []raftpb.Entry{{Term: 2, Index: 3, Data: []byte("foo")}},
			CommittedEntries: []raftpb.Entry{{Term: 2, Index: 3, Data: []byte("foo")}},
		},
	}
	mn := StartMultiNode(1)
	storage := NewMemoryStorage()
	mn.CreateGroup(1, newTestConfig(1, nil, 10, 1, storage), []Peer{{ID: 1}})
	mn.Campaign(ctx, 1)
	gs := <-mn.Ready()
	g := gs[1]
	if !reflect.DeepEqual(g, wants[0]) {
		t.Fatalf("#%d: g = %+v,\n             w   %+v", 1, g, wants[0])
	} else {
		storage.Append(g.Entries)
		mn.Advance(gs)
	}

	mn.Propose(ctx, 1, []byte("foo"))
	if gs2 := <-mn.Ready(); !reflect.DeepEqual(gs2[1], wants[1]) {
		t.Errorf("#%d: g = %+v,\n             w   %+v", 2, gs2[1], wants[1])
	} else {
		storage.Append(gs2[1].Entries)
		mn.Advance(gs2)
	}

	select {
	case rd := <-mn.Ready():
		t.Errorf("unexpected Ready: %+v", rd)
	case <-time.After(time.Millisecond):
	}
}

func (mn *multiNode) ProposeConfChange(ctx context.Context, group uint64, cc pb.ConfChange) error {
	data, err := cc.Marshal()
	if err != nil {
		return err
	}
	return mn.Step(ctx, group,
		pb.Message{
			Type: pb.MsgProp,
			Entries: []pb.Entry{
				{Type: pb.EntryConfChange, Data: data},
			},
		})
}

// TestMultiNodeProposeConfig ensures that multiNode.ProposeConfChange
// sends the given configuration proposal to the underlying raft.
func TestMultiNodeProposeConfig(t *testing.T) {
	mn := newMultiNode(1)
	go mn.run()
	s := NewMemoryStorage()
	mn.CreateGroup(1, newTestConfig(1, nil, 10, 1, s), []Peer{{ID: 1}})
	mn.Campaign(context.TODO(), 1)
	proposed := false
	var lastIndex uint64
	var ccdata []byte
	for {
		rds := <-mn.Ready()
		rd := rds[1]
		s.Append(rd.Entries)
		// change the step function to appendStep until this raft becomes leader
		if !proposed && rd.SoftState.Lead == mn.id {
			cc := raftpb.ConfChange{Type: raftpb.ConfChangeAddNode, NodeID: 1}
			var err error
			ccdata, err = cc.Marshal()
			if err != nil {
				t.Fatal(err)
			}
			mn.ProposeConfChange(context.TODO(), 1, cc)
			proposed = true
		}
		mn.Advance(rds)

		var err error
		lastIndex, err = s.LastIndex()
		if err != nil {
			t.Fatal(err)
		}
		if lastIndex >= 3 {
			break
		}
	}
	mn.Stop()

	entries, err := s.Entries(lastIndex, lastIndex+1, noLimit)
	if err != nil {
		t.Fatal(err)
	}
	if len(entries) != 1 {
		t.Fatalf("len(entries) = %d, want %d", len(entries), 1)
	}
	if entries[0].Type != raftpb.EntryConfChange {
		t.Fatalf("type = %v, want %v", entries[0].Type, raftpb.EntryConfChange)
	}
	if !bytes.Equal(entries[0].Data, ccdata) {
		t.Errorf("data = %v, want %v", entries[0].Data, ccdata)
	}
}

func (n *MultiNode) processConfChange(ctx context.Context, group uint64,
	cc raftpb.ConfChange, gn GroupNode) error {

	if group == 0 || gn.Node == 0 || gn.Group != group {
		glog.Fatalf("invalid group node: %v", gn)
	}

	id := n.genID()
	req := Request{Data: gn}

	var err error
	cc.Context, err = n.encReq(id, req)
	if err != nil {
		return err
	}

	ch := n.line.wait(id, req)

	d, err := cc.Marshal()
	if err != nil {
		return err
	}
	select {
	case n.propc <- multiMessage{
		group: group,
		msg: raftpb.Message{
			Type:    raftpb.MsgProp,
			Entries: []raftpb.Entry{{Type: raftpb.EntryConfChange, Data: d}},
		},
	}:
	case <-ctx.Done():
		n.line.cancel(id)
		return ctx.Err()
	case <-n.done:
		return ErrStopped
	}

	select {
	case res := <-ch:
		return res.Err
	case <-ctx.Done():
		n.line.cancel(id)
		return ctx.Err()
	case <-n.done:
		return ErrStopped
	}
}

// TestNodeProposeConfig ensures that node.ProposeConfChange sends the given configuration proposal
// to the underlying raft.
func TestNodeProposeConfig(t *testing.T) {
	msgs := []raftpb.Message{}
	appendStep := func(r *raft, m raftpb.Message) {
		msgs = append(msgs, m)
	}

	n := newNode()
	s := NewMemoryStorage()
	r := newTestRaft(1, []uint64{1}, 10, 1, s)
	go n.run(r)
	n.Campaign(context.TODO())
	for {
		rd := <-n.Ready()
		s.Append(rd.Entries)
		// change the step function to appendStep until this raft becomes leader
		if rd.SoftState.Lead == r.id {
			r.step = appendStep
			n.Advance()
			break
		}
		n.Advance()
	}
	cc := raftpb.ConfChange{Type: raftpb.ConfChangeAddNode, NodeID: 1}
	ccdata, err := cc.Marshal()
	if err != nil {
		t.Fatal(err)
	}
	n.ProposeConfChange(context.TODO(), cc)
	n.Stop()

	if len(msgs) != 1 {
		t.Fatalf("len(msgs) = %d, want %d", len(msgs), 1)
	}
	if msgs[0].Type != raftpb.MsgProp {
		t.Errorf("msg type = %d, want %d", msgs[0].Type, raftpb.MsgProp)
	}
	if !reflect.DeepEqual(msgs[0].Entries[0].Data, ccdata) {
		t.Errorf("data = %v, want %v", msgs[0].Entries[0].Data, ccdata)
	}
}

// StartNode returns a new Node given configuration and a list of raft peers.
// It appends a ConfChangeAddNode entry for each given peer to the initial log.
func StartNode(c *Config, peers []Peer) Node {
	r := newRaft(c)
	// become the follower at term 1 and apply initial configuration
	// entires of term 1
	r.becomeFollower(1, None)
	for _, peer := range peers {
		cc := pb.ConfChange{Type: pb.ConfChangeAddNode, NodeID: peer.ID, Context: peer.Context}
		d, err := cc.Marshal()
		if err != nil {
			panic("unexpected marshal error")
		}
		e := pb.Entry{Type: pb.EntryConfChange, Term: 1, Index: r.raftLog.lastIndex() + 1, Data: d}
		r.raftLog.append(e)
	}
	// Mark these initial entries as committed.
	// TODO(bdarnell): These entries are still unstable; do we need to preserve
	// the invariant that committed < unstable?
	r.raftLog.committed = r.raftLog.lastIndex()
	r.Commit = r.raftLog.committed
	// Now apply them, mainly so that the application can call Campaign
	// immediately after StartNode in tests. Note that these nodes will
	// be added to raft twice: here and when the application's Ready
	// loop calls ApplyConfChange. The calls to addNode must come after
	// all calls to raftLog.append so progress.next is set after these
	// bootstrapping entries (it is an error if we try to append these
	// entries since they have already been committed).
	// We do not set raftLog.applied so the application will be able
	// to observe all conf changes via Ready.CommittedEntries.
	for _, peer := range peers {
		r.addNode(peer.ID)
	}

	n := newNode()
	go n.run(r)
	return &n
}

func (mn *multiNode) run() {
	groups := map[uint64]*groupState{}
	rds := map[uint64]Ready{}
	var advancec chan map[uint64]Ready
	for {
		// Only select readyc if we have something to report and we are not
		// currently waiting for an advance.
		readyc := mn.readyc
		if len(rds) == 0 || advancec != nil {
			readyc = nil
		}

		// group points to the group that was touched on this iteration (if any)
		var group *groupState
		select {
		case gc := <-mn.groupc:
			gc.config.ID = mn.id
			r := newRaft(gc.config)
			group = &groupState{
				id:   gc.id,
				raft: r,
			}
			groups[gc.id] = group
			lastIndex, err := gc.config.Storage.LastIndex()
			if err != nil {
				panic(err) // TODO(bdarnell)
			}
			// If the log is empty, this is a new group (like StartNode); otherwise it's
			// restoring an existing group (like RestartNode).
			// TODO(bdarnell): rethink group initialization and whether the application needs
			// to be able to tell us when it expects the group to exist.
			if lastIndex == 0 {
				r.becomeFollower(1, None)
				ents := make([]pb.Entry, len(gc.peers))
				for i, peer := range gc.peers {
					cc := pb.ConfChange{Type: pb.ConfChangeAddNode, NodeID: peer.ID, Context: peer.Context}
					data, err := cc.Marshal()
					if err != nil {
						panic("unexpected marshal error")
					}
					ents[i] = pb.Entry{Type: pb.EntryConfChange, Term: 1, Index: uint64(i + 1), Data: data}
				}
				r.raftLog.append(ents...)
				r.raftLog.committed = uint64(len(ents))
				for _, peer := range gc.peers {
					r.addNode(peer.ID)
				}
			}
			// Set the initial hard and soft states after performing all initialization.
			group.prevSoftSt = r.softState()
			group.prevHardSt = r.HardState
			close(gc.done)

		case gr := <-mn.rmgroupc:
			delete(groups, gr.id)
			delete(rds, gr.id)
			close(gr.done)

		case mm := <-mn.propc:
			// TODO(bdarnell): single-node impl doesn't read from propc unless the group
			// has a leader; we can't do that since we have one propc for many groups.
			// We'll have to buffer somewhere on a group-by-group basis, or just let
			// raft.Step drop any such proposals on the floor.
			mm.msg.From = mn.id
			var ok bool
			if group, ok = groups[mm.group]; ok {
				group.raft.Step(mm.msg)
			}

		case mm := <-mn.recvc:
			group = groups[mm.group]
			if _, ok := group.raft.prs[mm.msg.From]; ok || !IsResponseMsg(mm.msg) {
				group.raft.Step(mm.msg)
			}

		case mcc := <-mn.confc:
			group = groups[mcc.group]
			if mcc.msg.NodeID == None {
				group.raft.resetPendingConf()
				select {
				case mcc.ch <- pb.ConfState{Nodes: group.raft.nodes()}:
				case <-mn.done:
				}
				break
			}
			switch mcc.msg.Type {
			case pb.ConfChangeAddNode:
				group.raft.addNode(mcc.msg.NodeID)
			case pb.ConfChangeRemoveNode:
				group.raft.removeNode(mcc.msg.NodeID)
			case pb.ConfChangeUpdateNode:
				group.raft.resetPendingConf()
			default:
				panic("unexpected conf type")
			}
			select {
			case mcc.ch <- pb.ConfState{Nodes: group.raft.nodes()}:
			case <-mn.done:
			}

//.........这里部分代码省略.........

// TestNodeStart ensures that a node can be started correctly. The node should
// start with correct configuration change entries, and can accept and commit
// proposals.
func TestNodeStart(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	cc := raftpb.ConfChange{Type: raftpb.ConfChangeAddNode, NodeID: 1}
	ccdata, err := cc.Marshal()
	if err != nil {
		t.Fatalf("unexpected marshal error: %v", err)
	}
	wants := []Ready{
		{
			SoftState: &SoftState{Lead: 1, RaftState: StateLeader},
			HardState: raftpb.HardState{Term: 2, Commit: 2, Vote: 1},
			Entries: []raftpb.Entry{
				{Type: raftpb.EntryConfChange, Term: 1, Index: 1, Data: ccdata},
				{Term: 2, Index: 2},
			},
			CommittedEntries: []raftpb.Entry{
				{Type: raftpb.EntryConfChange, Term: 1, Index: 1, Data: ccdata},
				{Term: 2, Index: 2},
			},
		},
		{
			HardState:        raftpb.HardState{Term: 2, Commit: 3, Vote: 1},
			Entries:          []raftpb.Entry{{Term: 2, Index: 3, Data: []byte("foo")}},
			CommittedEntries: []raftpb.Entry{{Term: 2, Index: 3, Data: []byte("foo")}},
		},
	}
	storage := NewMemoryStorage()
	c := &Config{
		ID:              1,
		ElectionTick:    10,
		HeartbeatTick:   1,
		Storage:         storage,
		MaxSizePerMsg:   noLimit,
		MaxInflightMsgs: 256,
	}
	n := StartNode(c, []Peer{{ID: 1}})
	n.Campaign(ctx)
	g := <-n.Ready()
	if !reflect.DeepEqual(g, wants[0]) {
		t.Fatalf("#%d: g = %+v,\n             w   %+v", 1, g, wants[0])
	} else {
		storage.Append(g.Entries)
		n.Advance()
	}

	n.Propose(ctx, []byte("foo"))
	if g2 := <-n.Ready(); !reflect.DeepEqual(g2, wants[1]) {
		t.Errorf("#%d: g = %+v,\n             w   %+v", 2, g2, wants[1])
	} else {
		storage.Append(g2.Entries)
		n.Advance()
	}

	select {
	case rd := <-n.Ready():
		t.Errorf("unexpected Ready: %+v", rd)
	case <-time.After(time.Millisecond):
	}
}

func (g *group) save(rdsv readySaved) error {
	glog.V(3).Infof("%v saving state", g)
	if rdsv.ready.SoftState != nil && rdsv.ready.SoftState.Lead != 0 {
		g.node.notifyElection(g.id)
	}

	// Apply snapshot to storage if it is more updated than current snapped.
	if !etcdraft.IsEmptySnap(rdsv.ready.Snapshot) {
		if err := g.diskStorage.SaveSnap(rdsv.ready.Snapshot); err != nil {
			glog.Fatalf("err in save snapshot: %v", err)
		}
		g.raftStorage.ApplySnapshot(rdsv.ready.Snapshot)
		glog.Infof("%v saved incoming snapshot at index %d", g,
			rdsv.ready.Snapshot.Metadata.Index)
	}

	err := g.diskStorage.Save(rdsv.ready.HardState, rdsv.ready.Entries)
	if err != nil {
		glog.Fatalf("err in raft storage save: %v", err)
	}
	glog.V(3).Infof("%v saved state on disk", g)

	g.raftStorage.Append(rdsv.ready.Entries)
	glog.V(3).Infof("%v appended entries in storage", g)

	// Apply config changes in the node as soon as possible
	// before applying other entries in the state machine.
	for _, e := range rdsv.ready.CommittedEntries {
		if e.Type != raftpb.EntryConfChange {
			continue
		}
		if e.Index <= g.saved {
			continue
		}
		g.saved = e.Index

		var cc raftpb.ConfChange
		pbutil.MustUnmarshal(&cc, e.Data)
		if glog.V(2) {
			glog.Infof("%v applies conf change %s: %s",
				g, formatConfChange(cc), formatEntry(e))
		}

		if err := g.validConfChange(cc); err != nil {
			glog.Errorf("%v received an invalid conf change for node %v: %v",
				g, cc.NodeID, err)
			cc.NodeID = etcdraft.None
			g.node.node.ApplyConfChange(g.id, cc)
			continue
		}

		cch := make(chan struct{})
		go func() {
			g.confState = *g.node.node.ApplyConfChange(g.id, cc)
			close(cch)
		}()

		select {
		case <-g.node.done:
			return ErrStopped
		case <-cch:
		}
	}

	glog.V(3).Infof("%v successfully saved ready", g)
	rdsv.saved <- struct{}{}

	select {
	case g.applyc <- rdsv.ready:
	case <-g.node.done:
	}

	return nil
}