Exemplo n.º 1
0
// makeRaft returns a Raft and its FSM, with snapshots based in the given dir.
func makeRaft(t *testing.T, dir string) (*raft.Raft, *MockFSM) {
	snaps, err := raft.NewFileSnapshotStore(dir, 5, nil)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	fsm := &MockFSM{}
	store := raft.NewInmemStore()
	addr, trans := raft.NewInmemTransport("")

	config := raft.DefaultConfig()
	config.LocalID = raft.ServerID(fmt.Sprintf("server-%s", addr))

	var members raft.Configuration
	members.Servers = append(members.Servers, raft.Server{
		Suffrage: raft.Voter,
		ID:       config.LocalID,
		Address:  addr,
	})

	err = raft.BootstrapCluster(config, store, store, snaps, trans, members)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	raft, err := raft.NewRaft(config, fsm, store, store, snaps, trans)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	timeout := time.After(10 * time.Second)
	for {
		if raft.Leader() != "" {
			break
		}

		select {
		case <-raft.LeaderCh():
		case <-time.After(1 * time.Second):
			// Need to poll because we might have missed the first
			// go with the leader channel.
		case <-timeout:
			t.Fatalf("timed out waiting for leader")
		}
	}

	return raft, fsm
}
Exemplo n.º 2
0
// setupRaft is used to setup and initialize Raft
func (s *Server) setupRaft() error {
	// If we have an unclean exit then attempt to close the Raft store.
	defer func() {
		if s.raft == nil && s.raftStore != nil {
			if err := s.raftStore.Close(); err != nil {
				s.logger.Printf("[ERR] consul: failed to close Raft store: %v", err)
			}
		}
	}()

	// Create the FSM.
	var err error
	s.fsm, err = NewFSM(s.tombstoneGC, s.config.LogOutput)
	if err != nil {
		return err
	}

	// Create a transport layer.
	trans := raft.NewNetworkTransport(s.raftLayer, 3, 10*time.Second, s.config.LogOutput)
	s.raftTransport = trans

	// Make sure we set the LogOutput.
	s.config.RaftConfig.LogOutput = s.config.LogOutput

	// Our version of Raft protocol requires the LocalID to match the network
	// address of the transport.
	s.config.RaftConfig.LocalID = raft.ServerID(trans.LocalAddr())

	// Build an all in-memory setup for dev mode, otherwise prepare a full
	// disk-based setup.
	var log raft.LogStore
	var stable raft.StableStore
	var snap raft.SnapshotStore
	if s.config.DevMode {
		store := raft.NewInmemStore()
		s.raftInmem = store
		stable = store
		log = store
		snap = raft.NewInmemSnapshotStore()
	} else {
		// Create the base raft path.
		path := filepath.Join(s.config.DataDir, raftState)
		if err := ensurePath(path, true); err != nil {
			return err
		}

		// Create the backend raft store for logs and stable storage.
		store, err := raftboltdb.NewBoltStore(filepath.Join(path, "raft.db"))
		if err != nil {
			return err
		}
		s.raftStore = store
		stable = store

		// Wrap the store in a LogCache to improve performance.
		cacheStore, err := raft.NewLogCache(raftLogCacheSize, store)
		if err != nil {
			return err
		}
		log = cacheStore

		// Create the snapshot store.
		snapshots, err := raft.NewFileSnapshotStore(path, snapshotsRetained, s.config.LogOutput)
		if err != nil {
			return err
		}
		snap = snapshots

		// For an existing cluster being upgraded to the new version of
		// Raft, we almost never want to run recovery based on the old
		// peers.json file. We create a peers.info file with a helpful
		// note about where peers.json went, and use that as a sentinel
		// to avoid ingesting the old one that first time (if we have to
		// create the peers.info file because it's not there, we also
		// blow away any existing peers.json file).
		peersFile := filepath.Join(path, "peers.json")
		peersInfoFile := filepath.Join(path, "peers.info")
		if _, err := os.Stat(peersInfoFile); os.IsNotExist(err) {
			if err := ioutil.WriteFile(peersInfoFile, []byte(peersInfoContent), 0755); err != nil {
				return fmt.Errorf("failed to write peers.info file: %v", err)
			}

			// Blow away the peers.json file if present, since the
			// peers.info sentinel wasn't there.
			if _, err := os.Stat(peersFile); err == nil {
				if err := os.Remove(peersFile); err != nil {
					return fmt.Errorf("failed to delete peers.json, please delete manually (see peers.info for details): %v", err)
				}
				s.logger.Printf("[INFO] consul: deleted peers.json file (see peers.info for details)")
			}
		} else if _, err := os.Stat(peersFile); err == nil {
			s.logger.Printf("[INFO] consul: found peers.json file, recovering Raft configuration...")
			configuration, err := raft.ReadPeersJSON(peersFile)
			if err != nil {
				return fmt.Errorf("recovery failed to parse peers.json: %v", err)
			}
			tmpFsm, err := NewFSM(s.tombstoneGC, s.config.LogOutput)
			if err != nil {
				return fmt.Errorf("recovery failed to make temp FSM: %v", err)
			}
			if err := raft.RecoverCluster(s.config.RaftConfig, tmpFsm,
				log, stable, snap, trans, configuration); err != nil {
				return fmt.Errorf("recovery failed: %v", err)
			}
			if err := os.Remove(peersFile); err != nil {
				return fmt.Errorf("recovery failed to delete peers.json, please delete manually (see peers.info for details): %v", err)
			}
			s.logger.Printf("[INFO] consul: deleted peers.json file after successful recovery")
		}
	}

	// If we are in bootstrap or dev mode and the state is clean then we can
	// bootstrap now.
	if s.config.Bootstrap || s.config.DevMode {
		hasState, err := raft.HasExistingState(log, stable, snap)
		if err != nil {
			return err
		}
		if !hasState {
			// TODO (slackpad) - This will need to be updated when
			// we add support for node IDs.
			configuration := raft.Configuration{
				Servers: []raft.Server{
					raft.Server{
						ID:      raft.ServerID(trans.LocalAddr()),
						Address: trans.LocalAddr(),
					},
				},
			}
			if err := raft.BootstrapCluster(s.config.RaftConfig,
				log, stable, snap, trans, configuration); err != nil {
				return err
			}
		}
	}

	// Setup the Raft store.
	s.raft, err = raft.NewRaft(s.config.RaftConfig, s.fsm, log, stable, snap, trans)
	if err != nil {
		return err
	}

	// Start monitoring leadership.
	go s.monitorLeadership()
	return nil
}