/usr/share/gocode/src/github.com/hashicorp/raft/raft_test.go is in golang-github-hashicorp-raft-dev 0.0~git20150728.9b586e2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"bytes"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"reflect"
"sync"
"testing"
"time"
"github.com/hashicorp/go-msgpack/codec"
)
// MockFSM is an implementation of the FSM interface, and just stores
// the logs sequentially.
type MockFSM struct {
sync.Mutex
logs [][]byte
}
type MockSnapshot struct {
logs [][]byte
maxIndex int
}
func (m *MockFSM) Apply(log *Log) interface{} {
m.Lock()
defer m.Unlock()
m.logs = append(m.logs, log.Data)
return len(m.logs)
}
func (m *MockFSM) Snapshot() (FSMSnapshot, error) {
m.Lock()
defer m.Unlock()
return &MockSnapshot{m.logs, len(m.logs)}, nil
}
func (m *MockFSM) Restore(inp io.ReadCloser) error {
m.Lock()
defer m.Unlock()
defer inp.Close()
hd := codec.MsgpackHandle{}
dec := codec.NewDecoder(inp, &hd)
m.logs = nil
return dec.Decode(&m.logs)
}
func (m *MockSnapshot) Persist(sink SnapshotSink) error {
hd := codec.MsgpackHandle{}
enc := codec.NewEncoder(sink, &hd)
if err := enc.Encode(m.logs[:m.maxIndex]); err != nil {
sink.Cancel()
return err
}
sink.Close()
return nil
}
func (m *MockSnapshot) Release() {
}
// Return configurations optimized for in-memory
func inmemConfig() *Config {
conf := DefaultConfig()
conf.HeartbeatTimeout = 50 * time.Millisecond
conf.ElectionTimeout = 50 * time.Millisecond
conf.LeaderLeaseTimeout = 50 * time.Millisecond
conf.CommitTimeout = time.Millisecond
return conf
}
type cluster struct {
dirs []string
stores []*InmemStore
fsms []*MockFSM
snaps []*FileSnapshotStore
trans []*InmemTransport
rafts []*Raft
}
func (c *cluster) Merge(other *cluster) {
c.dirs = append(c.dirs, other.dirs...)
c.stores = append(c.stores, other.stores...)
c.fsms = append(c.fsms, other.fsms...)
c.snaps = append(c.snaps, other.snaps...)
c.trans = append(c.trans, other.trans...)
c.rafts = append(c.rafts, other.rafts...)
}
func (c *cluster) Close() {
var futures []Future
for _, r := range c.rafts {
futures = append(futures, r.Shutdown())
}
// Wait for shutdown
timer := time.AfterFunc(200*time.Millisecond, func() {
panic("timed out waiting for shutdown")
})
for _, f := range futures {
if err := f.Error(); err != nil {
panic(fmt.Errorf("shutdown future err: %v", err))
}
}
timer.Stop()
for _, d := range c.dirs {
os.RemoveAll(d)
}
}
func (c *cluster) GetInState(s RaftState) []*Raft {
in := make([]*Raft, 0, 1)
for _, r := range c.rafts {
if r.State() == s {
in = append(in, r)
}
}
return in
}
func (c *cluster) Leader() *Raft {
timeout := time.AfterFunc(400*time.Millisecond, func() {
panic("timeout waiting for leader")
})
defer timeout.Stop()
for len(c.GetInState(Leader)) < 1 {
time.Sleep(time.Millisecond)
}
leaders := c.GetInState(Leader)
if len(leaders) != 1 {
panic(fmt.Errorf("expected one leader: %v", leaders))
}
return leaders[0]
}
func (c *cluster) FullyConnect() {
log.Printf("[WARN] Fully Connecting")
for i, t1 := range c.trans {
for j, t2 := range c.trans {
if i != j {
t1.Connect(t2.LocalAddr(), t2)
t2.Connect(t1.LocalAddr(), t1)
}
}
}
}
func (c *cluster) Disconnect(a string) {
log.Printf("[WARN] Disconnecting %v", a)
for _, t := range c.trans {
if t.localAddr == a {
t.DisconnectAll()
} else {
t.Disconnect(a)
}
}
}
func (c *cluster) EnsureLeader(t *testing.T, expect string) {
limit := time.Now().Add(400 * time.Millisecond)
CHECK:
for _, r := range c.rafts {
leader := r.Leader()
if expect == "" {
if leader != "" {
if time.Now().After(limit) {
t.Fatalf("leader %v expected nil", leader)
} else {
goto WAIT
}
}
} else {
if leader == "" || leader != expect {
if time.Now().After(limit) {
t.Fatalf("leader %v expected %v", leader, expect)
} else {
goto WAIT
}
}
}
}
return
WAIT:
time.Sleep(10 * time.Millisecond)
goto CHECK
}
func (c *cluster) EnsureSame(t *testing.T) {
limit := time.Now().Add(400 * time.Millisecond)
first := c.fsms[0]
CHECK:
first.Lock()
for i, fsm := range c.fsms {
if i == 0 {
continue
}
fsm.Lock()
if len(first.logs) != len(fsm.logs) {
fsm.Unlock()
if time.Now().After(limit) {
t.Fatalf("length mismatch: %d %d",
len(first.logs), len(fsm.logs))
} else {
goto WAIT
}
}
for idx := 0; idx < len(first.logs); idx++ {
if bytes.Compare(first.logs[idx], fsm.logs[idx]) != 0 {
fsm.Unlock()
if time.Now().After(limit) {
t.Fatalf("log mismatch at index %d", idx)
} else {
goto WAIT
}
}
}
fsm.Unlock()
}
first.Unlock()
return
WAIT:
first.Unlock()
time.Sleep(20 * time.Millisecond)
goto CHECK
}
func raftToPeerSet(r *Raft) map[string]struct{} {
peers := make(map[string]struct{})
peers[r.localAddr] = struct{}{}
raftPeers, _ := r.peerStore.Peers()
for _, p := range raftPeers {
peers[p] = struct{}{}
}
return peers
}
func (c *cluster) EnsureSamePeers(t *testing.T) {
limit := time.Now().Add(400 * time.Millisecond)
peerSet := raftToPeerSet(c.rafts[0])
CHECK:
for i, raft := range c.rafts {
if i == 0 {
continue
}
otherSet := raftToPeerSet(raft)
if !reflect.DeepEqual(peerSet, otherSet) {
if time.Now().After(limit) {
t.Fatalf("peer mismatch: %v %v", peerSet, otherSet)
} else {
goto WAIT
}
}
}
return
WAIT:
time.Sleep(20 * time.Millisecond)
goto CHECK
}
func MakeCluster(n int, t *testing.T, conf *Config) *cluster {
c := &cluster{}
peers := make([]string, 0, n)
// Setup the stores and transports
for i := 0; i < n; i++ {
dir, err := ioutil.TempDir("", "raft")
if err != nil {
t.Fatalf("err: %v ", err)
}
store := NewInmemStore()
c.dirs = append(c.dirs, dir)
c.stores = append(c.stores, store)
c.fsms = append(c.fsms, &MockFSM{})
dir2, snap := FileSnapTest(t)
c.dirs = append(c.dirs, dir2)
c.snaps = append(c.snaps, snap)
addr, trans := NewInmemTransport()
c.trans = append(c.trans, trans)
peers = append(peers, addr)
}
// Wire the transports together
c.FullyConnect()
// Create all the rafts
for i := 0; i < n; i++ {
if conf == nil {
conf = inmemConfig()
}
if n == 1 {
conf.EnableSingleNode = true
}
logs := c.stores[i]
store := c.stores[i]
snap := c.snaps[i]
trans := c.trans[i]
peerStore := &StaticPeers{StaticPeers: peers}
raft, err := NewRaft(conf, c.fsms[i], logs, store, snap, peerStore, trans)
if err != nil {
t.Fatalf("err: %v", err)
}
c.rafts = append(c.rafts, raft)
}
return c
}
func MakeClusterNoPeers(n int, t *testing.T, conf *Config) *cluster {
c := &cluster{}
// Setup the stores and transports
for i := 0; i < n; i++ {
dir, err := ioutil.TempDir("", "raft")
if err != nil {
t.Fatalf("err: %v ", err)
}
store := NewInmemStore()
c.dirs = append(c.dirs, dir)
c.stores = append(c.stores, store)
c.fsms = append(c.fsms, &MockFSM{})
dir2, snap := FileSnapTest(t)
c.dirs = append(c.dirs, dir2)
c.snaps = append(c.snaps, snap)
_, trans := NewInmemTransport()
c.trans = append(c.trans, trans)
}
// Wire the transports together
c.FullyConnect()
// Create all the rafts
for i := 0; i < n; i++ {
if conf == nil {
conf = inmemConfig()
}
logs := c.stores[i]
store := c.stores[i]
snap := c.snaps[i]
trans := c.trans[i]
peerStore := &StaticPeers{}
raft, err := NewRaft(conf, c.fsms[i], logs, store, snap, peerStore, trans)
if err != nil {
t.Fatalf("err: %v", err)
}
c.rafts = append(c.rafts, raft)
}
return c
}
/*
func TestRaft_StartStop(t *testing.T) {
c := MakeCluster(1, t, nil)
c.Close()
}
func TestRaft_AfterShutdown(t *testing.T) {
c := MakeCluster(1, t, nil)
c.Close()
raft := c.rafts[0]
// Everything should fail now
if f := raft.Apply(nil, 0); f.Error() != ErrRaftShutdown {
t.Fatalf("should be shutdown: %v", f.Error())
}
if f := raft.AddPeer(NewInmemAddr()); f.Error() != ErrRaftShutdown {
t.Fatalf("should be shutdown: %v", f.Error())
}
if f := raft.RemovePeer(NewInmemAddr()); f.Error() != ErrRaftShutdown {
t.Fatalf("should be shutdown: %v", f.Error())
}
if f := raft.Snapshot(); f.Error() != ErrRaftShutdown {
t.Fatalf("should be shutdown: %v", f.Error())
}
// Should be idempotent
raft.Shutdown()
}
func TestRaft_SingleNode(t *testing.T) {
conf := inmemConfig()
c := MakeCluster(1, t, conf)
defer c.Close()
raft := c.rafts[0]
// Watch leaderCh for change
select {
case v := <-raft.LeaderCh():
if !v {
t.Fatalf("should become leader")
}
case <-time.After(conf.HeartbeatTimeout * 3):
t.Fatalf("timeout becoming leader")
}
// Should be leader
if s := raft.State(); s != Leader {
t.Fatalf("expected leader: %v", s)
}
// Should be able to apply
future := raft.Apply([]byte("test"), time.Millisecond)
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Check the response
if future.Response().(int) != 1 {
t.Fatalf("bad response: %v", future.Response())
}
// Check the index
if idx := future.Index(); idx == 0 {
t.Fatalf("bad index: %d", idx)
}
// Check that it is applied to the FSM
if len(c.fsms[0].logs) != 1 {
t.Fatalf("did not apply to FSM!")
}
}
func TestRaft_TripleNode(t *testing.T) {
// Make the cluster
c := MakeCluster(3, t, nil)
defer c.Close()
// Should be one leader
leader := c.Leader()
c.EnsureLeader(t, leader.localAddr)
// Should be able to apply
future := leader.Apply([]byte("test"), time.Millisecond)
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Wait for replication
time.Sleep(30 * time.Millisecond)
// Check that it is applied to the FSM
for _, fsm := range c.fsms {
fsm.Lock()
num := len(fsm.logs)
fsm.Unlock()
if num != 1 {
t.Fatalf("did not apply to FSM!")
}
}
}
func TestRaft_LeaderFail(t *testing.T) {
// Make the cluster
c := MakeCluster(3, t, nil)
defer c.Close()
// Should be one leader
leader := c.Leader()
// Should be able to apply
future := leader.Apply([]byte("test"), time.Millisecond)
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Wait for replication
time.Sleep(30 * time.Millisecond)
// Disconnect the leader now
log.Printf("[INFO] Disconnecting %v", leader)
c.Disconnect(leader.localAddr)
// Wait for new leader
limit := time.Now().Add(200 * time.Millisecond)
var newLead *Raft
for time.Now().Before(limit) && newLead == nil {
time.Sleep(10 * time.Millisecond)
leaders := c.GetInState(Leader)
if len(leaders) == 1 && leaders[0] != leader {
newLead = leaders[0]
}
}
if newLead == nil {
t.Fatalf("expected new leader")
}
// Ensure the term is greater
if newLead.getCurrentTerm() <= leader.getCurrentTerm() {
t.Fatalf("expected newer term! %d %d", newLead.getCurrentTerm(), leader.getCurrentTerm())
}
// Apply should work not work on old leader
future1 := leader.Apply([]byte("fail"), time.Millisecond)
// Apply should work on newer leader
future2 := newLead.Apply([]byte("apply"), time.Millisecond)
// Future2 should work
if err := future2.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Reconnect the networks
log.Printf("[INFO] Reconnecting %v", leader)
c.FullyConnect()
// Future1 should fail
if err := future1.Error(); err != ErrLeadershipLost && err != ErrNotLeader {
t.Fatalf("err: %v", err)
}
// Wait for log replication
c.EnsureSame(t)
// Check two entries are applied to the FSM
for _, fsm := range c.fsms {
fsm.Lock()
if len(fsm.logs) != 2 {
t.Fatalf("did not apply both to FSM! %v", fsm.logs)
}
if bytes.Compare(fsm.logs[0], []byte("test")) != 0 {
t.Fatalf("first entry should be 'test'")
}
if bytes.Compare(fsm.logs[1], []byte("apply")) != 0 {
t.Fatalf("second entry should be 'apply'")
}
fsm.Unlock()
}
}
func TestRaft_BehindFollower(t *testing.T) {
// Make the cluster
c := MakeCluster(3, t, nil)
defer c.Close()
// Disconnect one follower
leader := c.Leader()
followers := c.GetInState(Follower)
behind := followers[0]
c.Disconnect(behind.localAddr)
// Commit a lot of things
var future Future
for i := 0; i < 100; i++ {
future = leader.Apply([]byte(fmt.Sprintf("test%d", i)), 0)
}
// Wait for the last future to apply
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
} else {
log.Printf("[INFO] Finished apply without behind follower")
}
// Check that we have a non zero last contact
if behind.LastContact().IsZero() {
t.Fatalf("expected previous contact")
}
// Reconnect the behind node
c.FullyConnect()
// Ensure all the logs are the same
c.EnsureSame(t)
// Ensure one leader
leader = c.Leader()
c.EnsureLeader(t, leader.localAddr)
}
func TestRaft_ApplyNonLeader(t *testing.T) {
// Make the cluster
c := MakeCluster(3, t, nil)
defer c.Close()
// Wait for a leader
c.Leader()
time.Sleep(10 * time.Millisecond)
// Try to apply to them
followers := c.GetInState(Follower)
if len(followers) != 2 {
t.Fatalf("Expected 2 followers")
}
follower := followers[0]
// Try to apply
future := follower.Apply([]byte("test"), time.Millisecond)
if future.Error() != ErrNotLeader {
t.Fatalf("should not apply on follower")
}
// Should be cached
if future.Error() != ErrNotLeader {
t.Fatalf("should not apply on follower")
}
}
func TestRaft_ApplyConcurrent(t *testing.T) {
// Make the cluster
conf := inmemConfig()
conf.HeartbeatTimeout = 80 * time.Millisecond
conf.ElectionTimeout = 80 * time.Millisecond
c := MakeCluster(3, t, conf)
defer c.Close()
// Wait for a leader
leader := c.Leader()
// Create a wait group
var group sync.WaitGroup
group.Add(100)
applyF := func(i int) {
defer group.Done()
future := leader.Apply([]byte(fmt.Sprintf("test%d", i)), 0)
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
}
}
// Concurrently apply
for i := 0; i < 100; i++ {
go applyF(i)
}
// Wait to finish
doneCh := make(chan struct{})
go func() {
group.Wait()
close(doneCh)
}()
select {
case <-doneCh:
case <-time.After(time.Second):
t.Fatalf("timeout")
}
// Check the FSMs
c.EnsureSame(t)
}
func TestRaft_ApplyConcurrent_Timeout(t *testing.T) {
// Make the cluster
conf := inmemConfig()
conf.HeartbeatTimeout = 80 * time.Millisecond
conf.ElectionTimeout = 80 * time.Millisecond
c := MakeCluster(1, t, conf)
defer c.Close()
// Wait for a leader
leader := c.Leader()
// Enough enqueues should cause at least one timeout...
var didTimeout int32 = 0
for i := 0; i < 200; i++ {
go func(i int) {
future := leader.Apply([]byte(fmt.Sprintf("test%d", i)), time.Microsecond)
if future.Error() == ErrEnqueueTimeout {
atomic.StoreInt32(&didTimeout, 1)
}
}(i)
}
// Wait
time.Sleep(20 * time.Millisecond)
// Some should have failed
if atomic.LoadInt32(&didTimeout) == 0 {
t.Fatalf("expected a timeout")
}
}
func TestRaft_JoinNode(t *testing.T) {
// Make a cluster
c := MakeCluster(2, t, nil)
defer c.Close()
// Apply a log to this cluster to ensure it is 'newer'
var future Future
leader := c.Leader()
future = leader.Apply([]byte("first"), 0)
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
} else {
log.Printf("[INFO] Applied log")
}
// Make a new cluster of 1
c1 := MakeCluster(1, t, nil)
// Merge clusters
c.Merge(c1)
c.FullyConnect()
// Wait until we have 2 leaders
limit := time.Now().Add(200 * time.Millisecond)
var leaders []*Raft
for time.Now().Before(limit) && len(leaders) != 2 {
time.Sleep(10 * time.Millisecond)
leaders = c.GetInState(Leader)
}
if len(leaders) != 2 {
t.Fatalf("expected two leader: %v", leaders)
}
// Join the new node in
future = leader.AddPeer(c1.rafts[0].localAddr)
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Wait until we have 2 followers
limit = time.Now().Add(200 * time.Millisecond)
var followers []*Raft
for time.Now().Before(limit) && len(followers) != 2 {
time.Sleep(10 * time.Millisecond)
followers = c.GetInState(Follower)
}
if len(followers) != 2 {
t.Fatalf("expected two followers: %v", followers)
}
// Check the FSMs
c.EnsureSame(t)
// Check the peers
c.EnsureSamePeers(t)
// Ensure one leader
leader = c.Leader()
c.EnsureLeader(t, leader.localAddr)
}
func TestRaft_RemoveFollower(t *testing.T) {
// Make a cluster
c := MakeCluster(3, t, nil)
defer c.Close()
// Get the leader
leader := c.Leader()
// Wait until we have 2 followers
limit := time.Now().Add(200 * time.Millisecond)
var followers []*Raft
for time.Now().Before(limit) && len(followers) != 2 {
time.Sleep(10 * time.Millisecond)
followers = c.GetInState(Follower)
}
if len(followers) != 2 {
t.Fatalf("expected two followers: %v", followers)
}
// Remove a follower
follower := followers[0]
future := leader.RemovePeer(follower.localAddr)
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Wait a while
time.Sleep(20 * time.Millisecond)
// Other nodes should have fewer peers
if peers, _ := leader.peerStore.Peers(); len(peers) != 2 {
t.Fatalf("too many peers")
}
if peers, _ := followers[1].peerStore.Peers(); len(peers) != 2 {
t.Fatalf("too many peers")
}
}
func TestRaft_RemoveLeader(t *testing.T) {
// Make a cluster
c := MakeCluster(3, t, nil)
defer c.Close()
// Get the leader
leader := c.Leader()
// Wait until we have 2 followers
limit := time.Now().Add(200 * time.Millisecond)
var followers []*Raft
for time.Now().Before(limit) && len(followers) != 2 {
time.Sleep(10 * time.Millisecond)
followers = c.GetInState(Follower)
}
if len(followers) != 2 {
t.Fatalf("expected two followers: %v", followers)
}
// Remove the leader
leader.RemovePeer(leader.localAddr)
// Wait a while
time.Sleep(20 * time.Millisecond)
// Should have a new leader
newLeader := c.Leader()
// Wait a bit for log application
time.Sleep(20 * time.Millisecond)
// Other nodes should have fewer peers
if peers, _ := newLeader.peerStore.Peers(); len(peers) != 2 {
t.Fatalf("too many peers")
}
// Old leader should be shutdown
if leader.State() != Shutdown {
t.Fatalf("leader should be shutdown")
}
// Old leader should have no peers
if peers, _ := leader.peerStore.Peers(); len(peers) != 1 {
t.Fatalf("leader should have no peers")
}
}
func TestRaft_RemoveLeader_NoShutdown(t *testing.T) {
// Make a cluster
conf := inmemConfig()
conf.ShutdownOnRemove = false
c := MakeCluster(3, t, conf)
defer c.Close()
// Get the leader
leader := c.Leader()
// Wait until we have 2 followers
limit := time.Now().Add(200 * time.Millisecond)
var followers []*Raft
for time.Now().Before(limit) && len(followers) != 2 {
time.Sleep(10 * time.Millisecond)
followers = c.GetInState(Follower)
}
if len(followers) != 2 {
t.Fatalf("expected two followers: %v", followers)
}
// Remove the leader
leader.RemovePeer(leader.localAddr)
// Wait a while
time.Sleep(20 * time.Millisecond)
// Should have a new leader
newLeader := c.Leader()
// Wait a bit for log application
time.Sleep(20 * time.Millisecond)
// Other nodes should have fewer peers
if peers, _ := newLeader.peerStore.Peers(); len(peers) != 2 {
t.Fatalf("too many peers")
}
// Old leader should be a follower
if leader.State() != Follower {
t.Fatalf("leader should be shutdown")
}
// Old leader should have no peers
if peers, _ := leader.peerStore.Peers(); len(peers) != 1 {
t.Fatalf("leader should have no peers")
}
}
func TestRaft_RemoveLeader_SplitCluster(t *testing.T) {
// Enable operation after a remove
conf := inmemConfig()
conf.EnableSingleNode = true
conf.ShutdownOnRemove = false
conf.DisableBootstrapAfterElect = false
// Make a cluster
c := MakeCluster(3, t, conf)
defer c.Close()
// Get the leader
leader := c.Leader()
// Remove the leader
leader.RemovePeer(leader.localAddr)
// Wait until we have 2 leaders
limit := time.Now().Add(200 * time.Millisecond)
var leaders []*Raft
for time.Now().Before(limit) && len(leaders) != 2 {
time.Sleep(10 * time.Millisecond)
leaders = c.GetInState(Leader)
}
if len(leaders) != 2 {
t.Fatalf("expected two leader: %v", leaders)
}
// Old leader should have no peers
if len(leader.peers) != 0 {
t.Fatalf("leader should have no peers")
}
}
func TestRaft_AddKnownPeer(t *testing.T) {
// Make a cluster
c := MakeCluster(3, t, nil)
defer c.Close()
// Get the leader
leader := c.Leader()
followers := c.GetInState(Follower)
// Add a follower
future := leader.AddPeer(followers[0].localAddr)
// Should be already added
if err := future.Error(); err != ErrKnownPeer {
t.Fatalf("err: %v", err)
}
}
func TestRaft_RemoveUnknownPeer(t *testing.T) {
// Make a cluster
c := MakeCluster(3, t, nil)
defer c.Close()
// Get the leader
leader := c.Leader()
// Remove unknown
future := leader.RemovePeer(NewInmemAddr())
// Should be already added
if err := future.Error(); err != ErrUnknownPeer {
t.Fatalf("err: %v", err)
}
}
func TestRaft_SnapshotRestore(t *testing.T) {
// Make the cluster
conf := inmemConfig()
conf.TrailingLogs = 10
c := MakeCluster(1, t, conf)
defer c.Close()
// Commit a lot of things
leader := c.Leader()
var future Future
for i := 0; i < 100; i++ {
future = leader.Apply([]byte(fmt.Sprintf("test%d", i)), 0)
}
// Wait for the last future to apply
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Take a snapshot
snapFuture := leader.Snapshot()
if err := snapFuture.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Check for snapshot
if snaps, _ := leader.snapshots.List(); len(snaps) != 1 {
t.Fatalf("should have a snapshot")
}
// Logs should be trimmed
if idx, _ := leader.logs.FirstIndex(); idx != 92 {
t.Fatalf("should trim logs to 92: %d", idx)
}
// Shutdown
shutdown := leader.Shutdown()
if err := shutdown.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Restart the Raft
r := leader
r, err := NewRaft(r.conf, r.fsm, r.logs, r.stable,
r.snapshots, r.peerStore, r.trans)
if err != nil {
t.Fatalf("err: %v", err)
}
c.rafts[0] = r
// We should have restored from the snapshot!
if last := r.getLastApplied(); last != 101 {
t.Fatalf("bad last: %v", last)
}
}
func TestRaft_SnapshotRestore_PeerChange(t *testing.T) {
// Make the cluster
conf := inmemConfig()
conf.TrailingLogs = 10
c := MakeCluster(3, t, conf)
defer c.Close()
// Commit a lot of things
leader := c.Leader()
var future Future
for i := 0; i < 100; i++ {
future = leader.Apply([]byte(fmt.Sprintf("test%d", i)), 0)
}
// Wait for the last future to apply
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Take a snapshot
snapFuture := leader.Snapshot()
if err := snapFuture.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Shutdown
shutdown := leader.Shutdown()
if err := shutdown.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Make a separate cluster
c2 := MakeClusterNoPeers(2, t, conf)
defer c2.Close()
// Kill the old cluster
for _, sec := range c.rafts {
if sec != leader {
sec.Shutdown()
}
}
// Change the peer addresses
peers := []string{leader.trans.LocalAddr()}
for _, sec := range c2.rafts {
peers = append(peers, sec.trans.LocalAddr())
}
// Restart the Raft with new peers
r := leader
peerStore := &StaticPeers{StaticPeers: peers}
r, err := NewRaft(r.conf, r.fsm, r.logs, r.stable,
r.snapshots, peerStore, r.trans)
if err != nil {
t.Fatalf("err: %v", err)
}
c.rafts[0] = r
c2.rafts = append(c2.rafts, r)
c2.trans = append(c2.trans, r.trans.(*InmemTransport))
c2.fsms = append(c2.fsms, r.fsm.(*MockFSM))
c2.FullyConnect()
// Wait a while
time.Sleep(50 * time.Millisecond)
// Ensure we elect a leader, and that we replicate
// to our new followers
c2.EnsureSame(t)
// We should have restored from the snapshot!
if last := r.getLastApplied(); last != 102 {
t.Fatalf("bad last: %v", last)
}
}
func TestRaft_AutoSnapshot(t *testing.T) {
// Make the cluster
conf := inmemConfig()
conf.SnapshotInterval = 5 * time.Millisecond
conf.SnapshotThreshold = 50
conf.TrailingLogs = 10
c := MakeCluster(1, t, conf)
defer c.Close()
// Commit a lot of things
leader := c.Leader()
var future Future
for i := 0; i < 100; i++ {
future = leader.Apply([]byte(fmt.Sprintf("test%d", i)), 0)
}
// Wait for the last future to apply
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Wait for a snapshot to happen
time.Sleep(50 * time.Millisecond)
// Check for snapshot
if snaps, _ := leader.snapshots.List(); len(snaps) == 0 {
t.Fatalf("should have a snapshot")
}
}
func TestRaft_SendSnapshotFollower(t *testing.T) {
// Make the cluster
conf := inmemConfig()
conf.TrailingLogs = 10
c := MakeCluster(3, t, conf)
defer c.Close()
// Disconnect one follower
followers := c.GetInState(Follower)
behind := followers[0]
c.Disconnect(behind.localAddr)
// Commit a lot of things
leader := c.Leader()
var future Future
for i := 0; i < 100; i++ {
future = leader.Apply([]byte(fmt.Sprintf("test%d", i)), 0)
}
// Wait for the last future to apply
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
} else {
log.Printf("[INFO] Finished apply without behind follower")
}
// Snapshot, this will truncate logs!
for _, r := range c.rafts {
future = r.Snapshot()
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
}
}
// Reconnect the behind node
c.FullyConnect()
// Ensure all the logs are the same
c.EnsureSame(t)
}
func TestRaft_ReJoinFollower(t *testing.T) {
// Enable operation after a remove
conf := inmemConfig()
conf.ShutdownOnRemove = false
// Make a cluster
c := MakeCluster(3, t, conf)
defer c.Close()
// Get the leader
leader := c.Leader()
// Wait until we have 2 followers
limit := time.Now().Add(200 * time.Millisecond)
var followers []*Raft
for time.Now().Before(limit) && len(followers) != 2 {
time.Sleep(10 * time.Millisecond)
followers = c.GetInState(Follower)
}
if len(followers) != 2 {
t.Fatalf("expected two followers: %v", followers)
}
// Remove a follower
follower := followers[0]
future := leader.RemovePeer(follower.localAddr)
if err := future.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Wait a while
time.Sleep(20 * time.Millisecond)
// Other nodes should have fewer peers
if peers, _ := leader.peerStore.Peers(); len(peers) != 2 {
t.Fatalf("too many peers: %v", peers)
}
if peers, _ := followers[1].peerStore.Peers(); len(peers) != 2 {
t.Fatalf("too many peers: %v", peers)
}
// Get the leader
time.Sleep(20 * time.Millisecond)
leader = c.Leader()
// Rejoin. The follower will have a higher term than the leader,
// this will cause the leader to step down, and a new round of elections
// to take place. We should eventually re-stabilize.
future = leader.AddPeer(follower.localAddr)
if err := future.Error(); err != nil && err != ErrLeadershipLost {
t.Fatalf("err: %v", err)
}
// Wait a while
time.Sleep(40 * time.Millisecond)
// Other nodes should have fewer peers
if peers, _ := leader.peerStore.Peers(); len(peers) != 3 {
t.Fatalf("missing peers: %v", peers)
}
if peers, _ := followers[1].peerStore.Peers(); len(peers) != 3 {
t.Fatalf("missing peers: %v", peers)
}
// Should be a follower now
if follower.State() != Follower {
t.Fatalf("bad state: %v", follower.State())
}
}
func TestRaft_LeaderLeaseExpire(t *testing.T) {
// Make a cluster
conf := inmemConfig()
c := MakeCluster(2, t, conf)
defer c.Close()
// Get the leader
leader := c.Leader()
// Wait until we have a followers
limit := time.Now().Add(200 * time.Millisecond)
var followers []*Raft
for time.Now().Before(limit) && len(followers) != 1 {
time.Sleep(10 * time.Millisecond)
followers = c.GetInState(Follower)
}
if len(followers) != 1 {
t.Fatalf("expected a followers: %v", followers)
}
// Disconnect the follower now
follower := followers[0]
log.Printf("[INFO] Disconnecting %v", follower)
c.Disconnect(follower.localAddr)
// Watch the leaderCh
select {
case v := <-leader.LeaderCh():
if v {
t.Fatalf("should step down as leader")
}
case <-time.After(conf.LeaderLeaseTimeout * 2):
t.Fatalf("timeout stepping down as leader")
}
// Should be no leaders
if len(c.GetInState(Leader)) != 0 {
t.Fatalf("expected step down")
}
// Verify no further contact
last := follower.LastContact()
time.Sleep(50 * time.Millisecond)
// Check that last contact has not changed
if last != follower.LastContact() {
t.Fatalf("unexpected further contact")
}
// Ensure both have cleared their leader
if l := leader.Leader(); l != "" {
t.Fatalf("bad: %v", l)
}
if l := follower.Leader(); l != "" {
t.Fatalf("bad: %v", l)
}
}
func TestRaft_Barrier(t *testing.T) {
// Make the cluster
c := MakeCluster(3, t, nil)
defer c.Close()
// Get the leader
leader := c.Leader()
// Commit a lot of things
for i := 0; i < 100; i++ {
leader.Apply([]byte(fmt.Sprintf("test%d", i)), 0)
}
// Wait for a barrier complete
barrier := leader.Barrier(0)
// Wait for the barrier future to apply
if err := barrier.Error(); err != nil {
t.Fatalf("err: %v", err)
}
// Ensure all the logs are the same
c.EnsureSame(t)
if len(c.fsms[0].logs) != 100 {
t.Fatalf("Bad log length")
}
}
func TestRaft_VerifyLeader(t *testing.T) {
// Make the cluster
c := MakeCluster(3, t, nil)
defer c.Close()
// Get the leader
leader := c.Leader()
// Verify we are leader
verify := leader.VerifyLeader()
// Wait for the verify to apply
if err := verify.Error(); err != nil {
t.Fatalf("err: %v", err)
}
}
func TestRaft_VerifyLeader_Single(t *testing.T) {
// Make the cluster
c := MakeCluster(1, t, nil)
defer c.Close()
// Get the leader
leader := c.Leader()
// Verify we are leader
verify := leader.VerifyLeader()
// Wait for the verify to apply
if err := verify.Error(); err != nil {
t.Fatalf("err: %v", err)
}
}
func TestRaft_VerifyLeader_Fail(t *testing.T) {
// Make a cluster
conf := inmemConfig()
c := MakeCluster(2, t, conf)
defer c.Close()
// Get the leader
leader := c.Leader()
// Wait until we have a followers
limit := time.Now().Add(200 * time.Millisecond)
var followers []*Raft
for time.Now().Before(limit) && len(followers) != 1 {
time.Sleep(10 * time.Millisecond)
followers = c.GetInState(Follower)
}
if len(followers) != 1 {
t.Fatalf("expected a followers: %v", followers)
}
// Force follower to different term
follower := followers[0]
follower.setCurrentTerm(follower.getCurrentTerm() + 1)
// Verify we are leader
verify := leader.VerifyLeader()
// Wait for the leader to step down
if err := verify.Error(); err != ErrNotLeader && err != ErrLeadershipLost {
t.Fatalf("err: %v", err)
}
// Ensure the known leader is cleared
if l := leader.Leader(); l != "" {
t.Fatalf("bad: %v", l)
}
}
func TestRaft_VerifyLeader_ParitalConnect(t *testing.T) {
// Make a cluster
conf := inmemConfig()
c := MakeCluster(3, t, conf)
defer c.Close()
// Get the leader
leader := c.Leader()
// Wait until we have a followers
limit := time.Now().Add(200 * time.Millisecond)
var followers []*Raft
for time.Now().Before(limit) && len(followers) != 2 {
time.Sleep(10 * time.Millisecond)
followers = c.GetInState(Follower)
}
if len(followers) != 2 {
t.Fatalf("expected a followers: %v", followers)
}
// Force partial disconnect
follower := followers[0]
log.Printf("[INFO] Disconnecting %v", follower)
c.Disconnect(follower.localAddr)
// Verify we are leader
verify := leader.VerifyLeader()
// Wait for the leader to step down
if err := verify.Error(); err != nil {
t.Fatalf("err: %v", err)
}
}
func TestRaft_SettingPeers(t *testing.T) {
// Make the cluster
c := MakeClusterNoPeers(3, t, nil)
defer c.Close()
peers := make([]string, 0)
for _, v := range c.rafts {
peers = append(peers, v.localAddr)
}
for _, v := range c.rafts {
future := v.SetPeers(peers)
if err := future.Error(); err != nil {
t.Fatalf("error setting peers: %v", err)
}
}
// Wait a while
time.Sleep(20 * time.Millisecond)
// Should have a new leader
if leader := c.Leader(); leader == nil {
t.Fatalf("no leader?")
}
}
*/
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