Exemplo n.º 1
0
func TestLogs(t *testing.T) {
	dir, l := LeveldbTestStore(t)
	defer os.RemoveAll(dir)

	// Should be no first index
	idx, err := l.FirstIndex()
	if err != nil {
		t.Fatalf("err: %v ", err)
	}
	if idx != 0 {
		t.Fatalf("bad idx: %d", idx)
	}

	// Should be no last index
	idx, err = l.LastIndex()
	if err != nil {
		t.Fatalf("err: %v ", err)
	}
	if idx != 0 {
		t.Fatalf("bad idx: %d", idx)
	}

	// Try a filed fetch
	var out raft.Log
	if err := l.GetLog(10, &out); err.Error() != "log not found" {
		t.Fatalf("err: %v ", err)
	}

	// Write out a log
	log := raft.Log{
		Index: 1,
		Term:  1,
		Type:  raft.LogCommand,
		Data:  []byte("first"),
	}
	for i := 1; i <= 10; i++ {
		log.Index = uint64(i)
		log.Term = uint64(i)
		if err := l.StoreLog(&log); err != nil {
			t.Fatalf("err: %v", err)
		}
	}

	// Attempt to write multiple logs
	var logs []*raft.Log
	for i := 11; i <= 20; i++ {
		nl := &raft.Log{
			Index: uint64(i),
			Term:  uint64(i),
			Type:  raft.LogCommand,
			Data:  []byte("first"),
		}
		logs = append(logs, nl)
	}
	if err := l.StoreLogs(logs); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Try to fetch
	if err := l.GetLog(10, &out); err != nil {
		t.Fatalf("err: %v ", err)
	}

	// Try to fetch
	if err := l.GetLog(20, &out); err != nil {
		t.Fatalf("err: %v ", err)
	}

	// Check the lowest index
	idx, err = l.FirstIndex()
	if err != nil {
		t.Fatalf("err: %v ", err)
	}
	if idx != 1 {
		t.Fatalf("bad idx: %d", idx)
	}

	// Check the highest index
	idx, err = l.LastIndex()
	if err != nil {
		t.Fatalf("err: %v ", err)
	}
	if idx != 20 {
		t.Fatalf("bad idx: %d", idx)
	}

	// Delete a suffix
	if err := l.DeleteRange(5, 20); err != nil {
		t.Fatalf("err: %v ", err)
	}

	// Verify they are all deleted
	for i := 5; i <= 20; i++ {
		if err := l.GetLog(uint64(i), &out); err != raft.ErrLogNotFound {
			t.Fatalf("err: %v ", err)
		}
	}

	// Index should be one
	idx, err = l.FirstIndex()
	if err != nil {
		t.Fatalf("err: %v ", err)
	}
	if idx != 1 {
		t.Fatalf("bad idx: %d", idx)
	}
	idx, err = l.LastIndex()
	if err != nil {
		t.Fatalf("err: %v ", err)
	}
	if idx != 4 {
		t.Fatalf("bad idx: %d", idx)
	}

	// Should not be able to fetch
	if err := l.GetLog(5, &out); err.Error() != "log not found" {
		t.Fatalf("err: %v ", err)
	}
}
Exemplo n.º 2
0
func (fsm *FSM) Apply(l *raft.Log) interface{} {
	// Skip all messages that are raft-related.
	if l.Type != raft.LogCommand {
		return nil
	}

	if err := fsm.ircstore.StoreLog(l); err != nil {
		log.Panicf("Could not persist message in irclogs/: %v", err)
	}

	msg := types.NewRobustMessageFromBytes(l.Data)
	log.Printf("Apply(msg.Type=%s)\n", msg.Type)

	defer func() {
		if msg.Type == types.RobustMessageOfDeath {
			return
		}
		if r := recover(); r != nil {
			// Panics in ircserver.ProcessMessage() are a problem, since
			// they will bring down the entire raft cluster and you cannot
			// bring up any raft node anymore without deleting the entire
			// log.
			//
			// Therefore, when we panic, we invalidate the log entry in
			// question before crashing. This doesn’t fix the underlying
			// bug, i.e. an IRC message will then go unhandled, but it
			// prevents RobustIRC from dying horribly in such a situation.
			msg.Type = types.RobustMessageOfDeath
			data, err := json.Marshal(msg)
			if err != nil {
				glog.Fatalf("Could not marshal message: %v", err)
			}
			l.Data = data
			if err := fsm.store.StoreLog(l); err != nil {
				glog.Fatalf("Could not store log while marking message as message of death: %v", err)
			}
			log.Printf("Marked %+v as message of death\n", l)
			glog.Fatalf("%v", r)
		}
	}()

	switch msg.Type {
	case types.RobustMessageOfDeath:
		// To prevent the message from being accepted again.
		ircServer.UpdateLastClientMessageID(&msg)
		log.Printf("Skipped message of death.\n")

	case types.RobustCreateSession:
		ircServer.CreateSession(msg.Id, msg.Data)

	case types.RobustDeleteSession:
		if _, err := ircServer.GetSession(msg.Session); err == nil {
			// TODO(secure): overwrite QUIT messages for services with an faq entry explaining that they are not robust yet.
			reply := ircServer.ProcessMessage(msg.Id, msg.Session, irc.ParseMessage("QUIT :"+string(msg.Data)))
			ircServer.SendMessages(reply, msg.Session, msg.Id.Id)
		}

	case types.RobustIRCFromClient:
		// Need to do this first, because ircserver.ProcessMessage could delete
		// the session, e.g. by using KILL or QUIT.
		if err := ircServer.UpdateLastClientMessageID(&msg); err != nil {
			log.Printf("Error updating the last message for session: %v\n", err)
		} else {
			reply := ircServer.ProcessMessage(msg.Id, msg.Session, irc.ParseMessage(string(msg.Data)))
			ircServer.SendMessages(reply, msg.Session, msg.Id.Id)
		}

	case types.RobustConfig:
		newCfg, err := config.FromString(string(msg.Data))
		if err != nil {
			log.Printf("Skipping unexpectedly invalid configuration (%v)\n", err)
		} else {
			netConfig = newCfg
			ircServer.Config = netConfig.IRC
		}
	}

	appliedMessages.WithLabelValues(msg.Type.String()).Inc()

	return nil
}