404 lines
9.8 KiB
Go
404 lines
9.8 KiB
Go
/*
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Copyright 2014 CoreOS, Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package raft
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import (
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"reflect"
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"testing"
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"time"
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"github.com/coreos/etcd/Godeps/_workspace/src/code.google.com/p/go.net/context"
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"github.com/coreos/etcd/pkg/testutil"
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"github.com/coreos/etcd/raft/raftpb"
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)
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// TestNodeStep ensures that node.Step sends msgProp to propc chan
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// and other kinds of messages to recvc chan.
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func TestNodeStep(t *testing.T) {
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for i, msgn := range raftpb.MessageType_name {
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n := &node{
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propc: make(chan raftpb.Message, 1),
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recvc: make(chan raftpb.Message, 1),
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}
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msgt := raftpb.MessageType(i)
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n.Step(context.TODO(), raftpb.Message{Type: msgt})
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// Proposal goes to proc chan. Others go to recvc chan.
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if msgt == raftpb.MsgProp {
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select {
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case <-n.propc:
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default:
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t.Errorf("%d: cannot receive %s on propc chan", msgt, msgn)
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}
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} else {
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if msgt == raftpb.MsgBeat || msgt == raftpb.MsgHup {
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select {
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case <-n.recvc:
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t.Errorf("%d: step should ignore %s", msgt, msgn)
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default:
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}
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} else {
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select {
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case <-n.recvc:
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default:
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t.Errorf("%d: cannot receive %s on recvc chan", msgt, msgn)
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}
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}
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}
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}
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}
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// Cancel and Stop should unblock Step()
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func TestNodeStepUnblock(t *testing.T) {
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// a node without buffer to block step
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n := &node{
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propc: make(chan raftpb.Message),
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done: make(chan struct{}),
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}
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ctx, cancel := context.WithCancel(context.Background())
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stopFunc := func() { close(n.done) }
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tests := []struct {
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unblock func()
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werr error
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}{
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{stopFunc, ErrStopped},
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{cancel, context.Canceled},
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}
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for i, tt := range tests {
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errc := make(chan error, 1)
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go func() {
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err := n.Step(ctx, raftpb.Message{Type: raftpb.MsgProp})
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errc <- err
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}()
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tt.unblock()
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select {
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case err := <-errc:
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if err != tt.werr {
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t.Errorf("#%d: err = %v, want %v", i, err, tt.werr)
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}
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//clean up side-effect
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if ctx.Err() != nil {
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ctx = context.TODO()
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}
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select {
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case <-n.done:
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n.done = make(chan struct{})
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default:
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}
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case <-time.After(time.Millisecond * 100):
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t.Errorf("#%d: failed to unblock step", i)
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}
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}
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}
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// TestNodePropose ensures that node.Propose sends the given proposal to the underlying raft.
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func TestNodePropose(t *testing.T) {
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msgs := []raftpb.Message{}
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appendStep := func(r *raft, m raftpb.Message) {
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msgs = append(msgs, m)
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}
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n := newNode()
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r := newRaft(1, []uint64{1}, 10, 1)
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go n.run(r)
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n.Campaign(context.TODO())
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for {
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rd := <-n.Ready()
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// change the step function to appendStep until this raft becomes leader
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if rd.SoftState.Lead == r.id {
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r.step = appendStep
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n.Advance()
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break
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}
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n.Advance()
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}
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n.Propose(context.TODO(), []byte("somedata"))
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n.Stop()
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if len(msgs) != 1 {
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t.Fatalf("len(msgs) = %d, want %d", len(msgs), 1)
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}
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if msgs[0].Type != raftpb.MsgProp {
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t.Errorf("msg type = %d, want %d", msgs[0].Type, raftpb.MsgProp)
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}
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if !reflect.DeepEqual(msgs[0].Entries[0].Data, []byte("somedata")) {
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t.Errorf("data = %v, want %v", msgs[0].Entries[0].Data, []byte("somedata"))
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}
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}
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// TestBlockProposal ensures that node will block proposal when it does not
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// know who is the current leader; node will accept proposal when it knows
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// who is the current leader.
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func TestBlockProposal(t *testing.T) {
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n := newNode()
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r := newRaft(1, []uint64{1}, 10, 1)
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go n.run(r)
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defer n.Stop()
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errc := make(chan error, 1)
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go func() {
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errc <- n.Propose(context.TODO(), []byte("somedata"))
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}()
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testutil.ForceGosched()
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select {
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case err := <-errc:
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t.Errorf("err = %v, want blocking", err)
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default:
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}
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n.Campaign(context.TODO())
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testutil.ForceGosched()
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select {
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case err := <-errc:
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if err != nil {
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t.Errorf("err = %v, want %v", err, nil)
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}
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default:
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t.Errorf("blocking proposal, want unblocking")
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}
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}
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// TestNodeTick ensures that node.Tick() will increase the
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// elapsed of the underly raft state machine.
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func TestNodeTick(t *testing.T) {
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n := newNode()
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r := newRaft(1, []uint64{1}, 10, 1)
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go n.run(r)
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elapsed := r.elapsed
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n.Tick()
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n.Stop()
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if r.elapsed != elapsed+1 {
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t.Errorf("elapsed = %d, want %d", r.elapsed, elapsed+1)
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}
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}
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func TestReadyContainUpdates(t *testing.T) {
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tests := []struct {
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rd Ready
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wcontain bool
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}{
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{Ready{}, false},
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{Ready{SoftState: &SoftState{Lead: 1}}, true},
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{Ready{HardState: raftpb.HardState{Vote: 1}}, true},
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{Ready{Entries: make([]raftpb.Entry, 1, 1)}, true},
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{Ready{CommittedEntries: make([]raftpb.Entry, 1, 1)}, true},
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{Ready{Messages: make([]raftpb.Message, 1, 1)}, true},
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{Ready{Snapshot: raftpb.Snapshot{Index: 1}}, true},
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}
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for i, tt := range tests {
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if g := tt.rd.containsUpdates(); g != tt.wcontain {
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t.Errorf("#%d: containUpdates = %v, want %v", i, g, tt.wcontain)
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}
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}
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}
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// TestNodeStart ensures that a node can be started correctly. The node should
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// start with correct configuration change entries, and can accept and commit
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// proposals.
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func TestNodeStart(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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cc := raftpb.ConfChange{Type: raftpb.ConfChangeAddNode, NodeID: 1}
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ccdata, err := cc.Marshal()
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if err != nil {
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t.Fatalf("unexpected marshal error: %v", err)
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}
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wants := []Ready{
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{
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SoftState: &SoftState{Lead: 1, Nodes: []uint64{1}, RaftState: StateLeader},
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HardState: raftpb.HardState{Term: 1, Commit: 2},
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Entries: []raftpb.Entry{
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{},
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{Type: raftpb.EntryConfChange, Term: 1, Index: 1, Data: ccdata},
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{Term: 1, Index: 2},
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},
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CommittedEntries: []raftpb.Entry{
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{Type: raftpb.EntryConfChange, Term: 1, Index: 1, Data: ccdata},
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{Term: 1, Index: 2},
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},
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},
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{
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HardState: raftpb.HardState{Term: 1, Commit: 3},
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Entries: []raftpb.Entry{{Term: 1, Index: 3, Data: []byte("foo")}},
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CommittedEntries: []raftpb.Entry{{Term: 1, Index: 3, Data: []byte("foo")}},
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},
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}
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n := StartNode(1, []Peer{{ID: 1}}, 10, 1)
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n.ApplyConfChange(cc)
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n.Campaign(ctx)
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if g := <-n.Ready(); !reflect.DeepEqual(g, wants[0]) {
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t.Errorf("#%d: g = %+v,\n w %+v", 1, g, wants[0])
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} else {
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n.Advance()
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}
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n.Propose(ctx, []byte("foo"))
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if g := <-n.Ready(); !reflect.DeepEqual(g, wants[1]) {
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t.Errorf("#%d: g = %+v,\n w %+v", 2, g, wants[1])
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} else {
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n.Advance()
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}
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select {
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case rd := <-n.Ready():
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t.Errorf("unexpected Ready: %+v", rd)
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default:
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}
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}
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func TestNodeRestart(t *testing.T) {
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entries := []raftpb.Entry{
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{},
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{Term: 1, Index: 1},
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{Term: 1, Index: 2, Data: []byte("foo")},
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}
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st := raftpb.HardState{Term: 1, Commit: 1}
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want := Ready{
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HardState: emptyState,
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// commit upto index commit index in st
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CommittedEntries: entries[1 : st.Commit+1],
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}
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n := RestartNode(1, 10, 1, nil, st, entries)
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if g := <-n.Ready(); !reflect.DeepEqual(g, want) {
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t.Errorf("g = %+v,\n w %+v", g, want)
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} else {
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n.Advance()
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}
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select {
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case rd := <-n.Ready():
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t.Errorf("unexpected Ready: %+v", rd)
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default:
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}
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}
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// TestCompacts ensures Node.Compact creates a correct raft snapshot and compacts
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// the raft log (call raft.compact)
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func TestNodeCompact(t *testing.T) {
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ctx := context.Background()
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n := newNode()
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r := newRaft(1, []uint64{1}, 10, 1)
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go n.run(r)
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n.Campaign(ctx)
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n.Propose(ctx, []byte("foo"))
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w := raftpb.Snapshot{
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Term: 1,
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Index: 2, // one nop + one proposal
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Data: []byte("a snapshot"),
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Nodes: []uint64{1},
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}
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testutil.ForceGosched()
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select {
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case <-n.Ready():
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n.Advance()
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default:
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t.Fatalf("unexpected proposal failure: unable to commit entry")
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}
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n.Compact(w.Index, w.Nodes, w.Data)
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testutil.ForceGosched()
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select {
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case rd := <-n.Ready():
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if !reflect.DeepEqual(rd.Snapshot, w) {
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t.Errorf("snap = %+v, want %+v", rd.Snapshot, w)
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}
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n.Advance()
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default:
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t.Fatalf("unexpected compact failure: unable to create a snapshot")
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}
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testutil.ForceGosched()
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// TODO: this test the run updates the snapi correctly... should be tested
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// separately with other kinds of updates
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select {
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case <-n.Ready():
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t.Fatalf("unexpected more ready")
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default:
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}
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n.Stop()
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if r.raftLog.offset != w.Index {
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t.Errorf("log.offset = %d, want %d", r.raftLog.offset, w.Index)
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}
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}
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func TestNodeAdvance(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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n := StartNode(1, []Peer{{ID: 1}}, 10, 1)
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n.ApplyConfChange(raftpb.ConfChange{Type: raftpb.ConfChangeAddNode, NodeID: 1})
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n.Campaign(ctx)
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<-n.Ready()
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n.Propose(ctx, []byte("foo"))
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select {
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case rd := <-n.Ready():
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t.Fatalf("unexpected Ready before Advance: %+v", rd)
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default:
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}
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n.Advance()
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select {
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case <-n.Ready():
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default:
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t.Errorf("expect Ready after Advance, but there is no Ready available")
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}
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}
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func TestSoftStateEqual(t *testing.T) {
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tests := []struct {
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st *SoftState
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we bool
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}{
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{&SoftState{}, true},
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{&SoftState{Lead: 1}, false},
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{&SoftState{RaftState: StateLeader}, false},
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{&SoftState{Nodes: []uint64{1, 2}}, false},
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}
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for i, tt := range tests {
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if g := tt.st.equal(&SoftState{}); g != tt.we {
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t.Errorf("#%d, equal = %v, want %v", i, g, tt.we)
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}
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}
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}
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func TestIsHardStateEqual(t *testing.T) {
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tests := []struct {
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st raftpb.HardState
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we bool
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}{
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{emptyState, true},
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{raftpb.HardState{Vote: 1}, false},
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{raftpb.HardState{Commit: 1}, false},
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{raftpb.HardState{Term: 1}, false},
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}
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for i, tt := range tests {
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if isHardStateEqual(tt.st, emptyState) != tt.we {
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t.Errorf("#%d, equal = %v, want %v", i, isHardStateEqual(tt.st, emptyState), tt.we)
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}
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}
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}
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