Golang store.MaxVersion函数代码示例

// Send join requests to peer.
func (s *PeerServer) joinByPeer(server raft.Server, peer string, scheme string) error {
	var b bytes.Buffer

	// t must be ok
	t, _ := server.Transporter().(*transporter)

	// Our version must match the leaders version
	versionURL := url.URL{Host: peer, Scheme: scheme, Path: "/version"}
	version, err := getVersion(t, versionURL)
	if err != nil {
		return fmt.Errorf("Error during join version check: %v", err)
	}
	if version < store.MinVersion() || version > store.MaxVersion() {
		return fmt.Errorf("Unable to join: cluster version is %d; version compatibility is %d - %d", version, store.MinVersion(), store.MaxVersion())
	}

	json.NewEncoder(&b).Encode(NewJoinCommand(store.MinVersion(), store.MaxVersion(), server.Name(), s.Config.URL, s.server.URL()))

	joinURL := url.URL{Host: peer, Scheme: scheme, Path: "/join"}

	log.Debugf("Send Join Request to %s", joinURL.String())

	resp, req, err := t.Post(joinURL.String(), &b)

	for {
		if err != nil {
			return fmt.Errorf("Unable to join: %v", err)
		}
		if resp != nil {
			defer resp.Body.Close()

			t.CancelWhenTimeout(req)

			if resp.StatusCode == http.StatusOK {
				b, _ := ioutil.ReadAll(resp.Body)
				s.joinIndex, _ = binary.Uvarint(b)
				return nil
			}
			if resp.StatusCode == http.StatusTemporaryRedirect {
				address := resp.Header.Get("Location")
				log.Debugf("Send Join Request to %s", address)
				json.NewEncoder(&b).Encode(NewJoinCommand(store.MinVersion(), store.MaxVersion(), server.Name(), s.Config.URL, s.server.URL()))
				resp, req, err = t.Post(address, &b)

			} else if resp.StatusCode == http.StatusBadRequest {
				log.Debug("Reach max number peers in the cluster")
				decoder := json.NewDecoder(resp.Body)
				err := &etcdErr.Error{}
				decoder.Decode(err)
				return *err
			} else {
				return fmt.Errorf("Unable to join")
			}
		}

	}
}

// Send join requests to peer.
// The first return tells whether it is rejected by the cluster directly.
func (s *PeerServer) joinByPeer(server raft.Server, peer string, scheme string) (bool, error) {
	u := (&url.URL{Host: peer, Scheme: scheme}).String()

	// Our version must match the leaders version
	version, err := s.client.GetVersion(u)
	if err != nil {
		return false, fmt.Errorf("fail checking join version: %v", err)
	}
	if version < store.MinVersion() || version > store.MaxVersion() {
		return true, fmt.Errorf("fail passing version compatibility(%d-%d) using %d", store.MinVersion(), store.MaxVersion(), version)
	}

	// Fetch current peer list
	machines, err := s.client.GetMachines(u)
	if err != nil {
		return false, fmt.Errorf("fail getting machine messages: %v", err)
	}
	exist := false
	for _, machine := range machines {
		if machine.Name == server.Name() {
			exist = true
			break
		}
	}

	// Fetch cluster config to see whether exists some place.
	clusterConfig, err := s.client.GetClusterConfig(u)
	if err != nil {
		return false, fmt.Errorf("fail getting cluster config: %v", err)
	}
	if !exist && clusterConfig.ActiveSize <= len(machines) {
		return true, fmt.Errorf("stop joining because the cluster is full with %d nodes", len(machines))
	}

	joinIndex, err := s.client.AddMachine(u,
		&JoinCommand{
			MinVersion: store.MinVersion(),
			MaxVersion: store.MaxVersion(),
			Name:       server.Name(),
			RaftURL:    s.Config.URL,
			EtcdURL:    s.server.URL(),
		})
	if err != nil {
		return err.ErrorCode == etcdErr.EcodeNoMorePeer, fmt.Errorf("fail on join request: %v", err)
	}

	s.joinIndex = joinIndex
	return false, nil
}

func (s *StandbyServer) join(peer string) error {
	for _, url := range s.ClusterURLs() {
		if s.Config.PeerURL == url {
			s.joinIndex = 0
			return nil
		}
	}

	// Our version must match the leaders version
	version, err := s.client.GetVersion(peer)
	if err != nil {
		log.Debugf("error getting peer version")
		return err
	}
	if version < store.MinVersion() || version > store.MaxVersion() {
		log.Debugf("fail passing version compatibility(%d-%d) using %d", store.MinVersion(), store.MaxVersion(), version)
		return fmt.Errorf("incompatible version")
	}

	// Fetch cluster config to see whether exists some place.
	clusterConfig, err := s.client.GetClusterConfig(peer)
	if err != nil {
		log.Debugf("error getting cluster config")
		return err
	}
	if clusterConfig.ActiveSize <= len(s.Cluster) {
		log.Debugf("stop joining because the cluster is full with %d nodes", len(s.Cluster))
		return fmt.Errorf("out of quota")
	}

	commitIndex, err := s.client.AddMachine(peer,
		&JoinCommand{
			MinVersion: store.MinVersion(),
			MaxVersion: store.MaxVersion(),
			Name:       s.Config.Name,
			RaftURL:    s.Config.PeerURL,
			EtcdURL:    s.Config.ClientURL,
		})
	if err != nil {
		log.Debugf("error on join request")
		return err
	}
	s.joinIndex = commitIndex

	return nil
}

func TestStandbyJoinMiss(t *testing.T) {
	clusterSize := 2
	_, etcds, err := CreateCluster(clusterSize, &os.ProcAttr{Files: []*os.File{nil, os.Stdout, os.Stderr}}, false)
	if err != nil {
		t.Fatal("cannot create cluster")
	}
	defer DestroyCluster(etcds)

	c := etcd.NewClient(nil)
	c.SyncCluster()

	time.Sleep(1 * time.Second)

	// Verify that we have two machines.
	result, err := c.Get("_etcd/machines", false, true)
	assert.NoError(t, err)
	assert.Equal(t, len(result.Node.Nodes), clusterSize)

	resp, _ := tests.Put("http://localhost:7001/v2/admin/config", "application/json", bytes.NewBufferString(`{"removeDelay":4, "syncInterval":4}`))
	if !assert.Equal(t, resp.StatusCode, 200) {
		t.FailNow()
	}
	time.Sleep(time.Second)

	resp, _ = tests.Delete("http://localhost:7001/v2/admin/machines/node2", "application/json", nil)
	if !assert.Equal(t, resp.StatusCode, 200) {
		t.FailNow()
	}

	// Wait for a monitor cycle before checking for removal.
	time.Sleep(server.ActiveMonitorTimeout + (1 * time.Second))

	// Verify that we now have one peer.
	result, err = c.Get("_etcd/machines", false, true)
	assert.NoError(t, err)
	assert.Equal(t, len(result.Node.Nodes), 1)

	// Simulate the join failure
	_, err = server.NewClient(nil).AddMachine("http://localhost:7001",
		&server.JoinCommand{
			MinVersion: store.MinVersion(),
			MaxVersion: store.MaxVersion(),
			Name:       "node2",
			RaftURL:    "http://127.0.0.1:7002",
			EtcdURL:    "http://127.0.0.1:4002",
		})
	assert.NoError(t, err)

	time.Sleep(6 * time.Second)

	go tests.Delete("http://localhost:7001/v2/admin/machines/node2", "application/json", nil)

	time.Sleep(time.Second)
	result, err = c.Get("_etcd/machines", false, true)
	assert.NoError(t, err)
	assert.Equal(t, len(result.Node.Nodes), 1)
}

// Checks whether a given version is supported.
func (ps *PeerServer) VersionCheckHttpHandler(w http.ResponseWriter, req *http.Request) {
	log.Debugf("[recv] Get %s%s ", ps.Config.URL, req.URL.Path)
	vars := mux.Vars(req)
	version, _ := strconv.Atoi(vars["version"])
	if version >= store.MinVersion() && version <= store.MaxVersion() {
		w.WriteHeader(http.StatusOK)
	} else {
		w.WriteHeader(http.StatusForbidden)
	}
}

func (s *PeerServer) startAsLeader() {
	// leader need to join self as a peer
	for {
		_, err := s.raftServer.Do(NewJoinCommand(store.MinVersion(), store.MaxVersion(), s.raftServer.Name(), s.Config.URL, s.server.URL()))
		if err == nil {
			break
		}
	}
	log.Debugf("%s start as a leader", s.Config.Name)
}

func (s *PeerServer) InitNewCluster(clusterConfig *ClusterConfig) {
	// leader need to join self as a peer
	s.doCommand(&JoinCommand{
		MinVersion: store.MinVersion(),
		MaxVersion: store.MaxVersion(),
		Name:       s.raftServer.Name(),
		RaftURL:    s.Config.URL,
		EtcdURL:    s.server.URL(),
	})
	log.Debugf("%s start as a leader", s.Config.Name)
	s.joinIndex = 1

	s.doCommand(&SetClusterConfigCommand{Config: clusterConfig})
	log.Debugf("%s sets cluster config as %v", s.Config.Name, clusterConfig)
}

func (s *PeerServer) startAsLeader() {
	s.raftServer.Start()
	// leader need to join self as a peer
	for {
		c := &JoinCommand{
			MinVersion: store.MinVersion(),
			MaxVersion: store.MaxVersion(),
			Name:       s.raftServer.Name(),
			RaftURL:    s.Config.URL,
			EtcdURL:    s.server.URL(),
		}
		if _, err := s.raftServer.Do(c); err == nil {
			break
		}
	}
	log.Debugf("%s start as a leader", s.Config.Name)
}

// Send join requests to peer.
func (s *PeerServer) joinByPeer(server raft.Server, peer string, scheme string) error {
	// t must be ok
	t, _ := server.Transporter().(*transporter)

	// Our version must match the leaders version
	versionURL := url.URL{Host: peer, Scheme: scheme, Path: "/version"}
	version, err := getVersion(t, versionURL)
	if err != nil {
		return fmt.Errorf("Error during join version check: %v", err)
	}
	if version < store.MinVersion() || version > store.MaxVersion() {
		return fmt.Errorf("Unable to join: cluster version is %d; version compatibility is %d - %d", version, store.MinVersion(), store.MaxVersion())
	}

	var b bytes.Buffer
	c := &JoinCommandV2{
		MinVersion: store.MinVersion(),
		MaxVersion: store.MaxVersion(),
		Name:       server.Name(),
		PeerURL:    s.Config.URL,
		ClientURL:  s.server.URL(),
	}
	json.NewEncoder(&b).Encode(c)

	joinURL := url.URL{Host: peer, Scheme: scheme, Path: "/v2/admin/machines/" + server.Name()}
	log.Infof("Send Join Request to %s", joinURL.String())

	req, _ := http.NewRequest("PUT", joinURL.String(), &b)
	resp, err := t.client.Do(req)

	for {
		if err != nil {
			return fmt.Errorf("Unable to join: %v", err)
		}
		if resp != nil {
			defer resp.Body.Close()

			log.Infof("»»»» %d", resp.StatusCode)
			if resp.StatusCode == http.StatusOK {
				var msg joinMessageV2
				if err := json.NewDecoder(resp.Body).Decode(&msg); err != nil {
					log.Debugf("Error reading join response: %v", err)
					return err
				}
				s.joinIndex = msg.CommitIndex
				s.setMode(msg.Mode)

				if msg.Mode == ProxyMode {
					s.proxyClientURL = resp.Header.Get("X-Leader-Client-URL")
					s.proxyPeerURL = resp.Header.Get("X-Leader-Peer-URL")
				}

				return nil
			}
			if resp.StatusCode == http.StatusTemporaryRedirect {
				address := resp.Header.Get("Location")
				log.Debugf("Send Join Request to %s", address)
				c := &JoinCommandV1{
					MinVersion: store.MinVersion(),
					MaxVersion: store.MaxVersion(),
					Name:       server.Name(),
					RaftURL:    s.Config.URL,
					EtcdURL:    s.server.URL(),
				}
				json.NewEncoder(&b).Encode(c)
				resp, _, err = t.Post(address, &b)

			} else if resp.StatusCode == http.StatusBadRequest {
				log.Debug("Reach max number peers in the cluster")
				decoder := json.NewDecoder(resp.Body)
				err := &etcdErr.Error{}
				decoder.Decode(err)
				return *err
			} else {
				return fmt.Errorf("Unable to join")
			}
		}

	}
}