Beispiel #1
0
// Sends RequestVote RPCs to a peer when the server is the candidate.
func (t *transporter) SendVoteRequest(server raft.Server, peer *raft.Peer, req *raft.RequestVoteRequest) *raft.RequestVoteResponse {
	var b bytes.Buffer

	if _, err := req.Encode(&b); err != nil {
		log.Warn("transporter.vr.encoding.error:", err)
		return nil
	}

	u, _ := t.registry.PeerURL(peer.Name)
	log.Debugf("Send Vote from %s to %s", server.Name(), u)

	resp, _, err := t.Post(fmt.Sprintf("%s/vote", u), &b)

	if err != nil {
		log.Debugf("Cannot send VoteRequest to %s : %s", u, err)
	}

	if resp != nil {
		defer resp.Body.Close()

		rvrsp := &raft.RequestVoteResponse{}
		if _, err = rvrsp.Decode(resp.Body); err != nil && err != io.EOF {
			log.Warn("transporter.vr.decoding.error:", err)
			return nil
		}
		return rvrsp
	}
	return nil
}
Beispiel #2
0
// Sends SnapshotRecoveryRequest RPCs to a peer when the server is the candidate.
func (t *transporter) SendSnapshotRecoveryRequest(server raft.Server, peer *raft.Peer, req *raft.SnapshotRecoveryRequest) *raft.SnapshotRecoveryResponse {
	var b bytes.Buffer

	if _, err := req.Encode(&b); err != nil {
		log.Warn("transporter.ss.encoding.error:", err)
		return nil
	}

	u, _ := t.registry.PeerURL(peer.Name)
	log.Debugf("Send Snapshot Recovery from %s to %s", server.Name(), u)

	resp, err := t.PostSnapshot(fmt.Sprintf("%s/snapshotRecovery", u), &b)

	if err != nil {
		log.Debugf("Cannot send Snapshot Recovery to %s : %s", u, err)
	}

	if resp != nil {
		defer resp.Body.Close()

		ssrrsp := &raft.SnapshotRecoveryResponse{}
		if _, err = ssrrsp.Decode(resp.Body); err != nil && err != io.EOF {
			log.Warn("transporter.ssr.decoding.error:", err)
			return nil
		}
		return ssrrsp
	}
	return nil

}
Beispiel #3
0
// 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
}
Beispiel #4
0
// 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")
			}
		}

	}
}