*: check raftcluster nil (#7054) (#7069)

close #7053

Signed-off-by: husharp <[email protected]>

Co-authored-by: husharp <[email protected]>

server/api/min_resolved_ts.go

@@ -48,7 +48,7 @@ type minResolvedTS struct {
 // @Failure  500  {string}  string  "PD server failed to proceed the request."
 // @Router   /min-resolved-ts [get]
 func (h *minResolvedTSHandler) GetMinResolvedTS(w http.ResponseWriter, r *http.Request) {
-	c := h.svr.GetRaftCluster()
+	c := getCluster(r)
 	value := c.GetMinResolvedTS()
 	persistInterval := c.GetOpts().GetPDServerConfig().MinResolvedTSPersistenceInterval
 	h.rd.JSON(w, http.StatusOK, minResolvedTS{

server/api/router.go

@@ -327,7 +327,7 @@ func createRouter(prefix string, svr *server.Server) *mux.Router {
 
 	// min resolved ts API
 	minResolvedTSHandler := newMinResolvedTSHandler(svr, rd)
-	registerFunc(apiRouter, "/min-resolved-ts", minResolvedTSHandler.GetMinResolvedTS, setMethods("GET"))
+	registerFunc(clusterRouter, "/min-resolved-ts", minResolvedTSHandler.GetMinResolvedTS, setMethods("GET"))
 
 	// unsafe admin operation API
 	unsafeOperationHandler := newUnsafeOperationHandler(svr, rd)

server/grpc_service.go

@@ -1210,7 +1210,6 @@ func (s *GrpcServer) ReportBatchSplit(ctx context.Context, request *pdpb.ReportB
 	if rc == nil {
 		return &pdpb.ReportBatchSplitResponse{Header: s.notBootstrappedHeader()}, nil
 	}
-
 	_, err := rc.HandleBatchReportSplit(request)
 	if err != nil {
 		return &pdpb.ReportBatchSplitResponse{
@@ -1697,6 +1696,9 @@ func (s *GrpcServer) SplitAndScatterRegions(ctx context.Context, request *pdpb.S
 		return rsp.(*pdpb.SplitAndScatterRegionsResponse), err
 	}
 	rc := s.GetRaftCluster()
+	if rc == nil {
+		return &pdpb.SplitAndScatterRegionsResponse{Header: s.notBootstrappedHeader()}, nil
+	}
 	splitFinishedPercentage, newRegionIDs := rc.GetRegionSplitter().SplitRegions(ctx, request.GetSplitKeys(), int(request.GetRetryLimit()))
 	scatterFinishedPercentage, err := scatterRegions(rc, newRegionIDs, request.GetGroup(), int(request.GetRetryLimit()))
 	if err != nil {

server/handler.go

@@ -925,14 +925,20 @@ func (h *Handler) ResetTS(ts uint64) error {
 
 // SetStoreLimitScene sets the limit values for different scenes
 func (h *Handler) SetStoreLimitScene(scene *storelimit.Scene, limitType storelimit.Type) {
-	cluster := h.s.GetRaftCluster()
-	cluster.GetStoreLimiter().ReplaceStoreLimitScene(scene, limitType)
+	rc := h.s.GetRaftCluster()
+	if rc == nil {
+		return
+	}
+	rc.GetStoreLimiter().ReplaceStoreLimitScene(scene, limitType)
 }
 
 // GetStoreLimitScene returns the limit values for different scenes
 func (h *Handler) GetStoreLimitScene(limitType storelimit.Type) *storelimit.Scene {
-	cluster := h.s.GetRaftCluster()
-	return cluster.GetStoreLimiter().StoreLimitScene(limitType)
+	rc := h.s.GetRaftCluster()
+	if rc == nil {
+		return nil
+	}
+	return rc.GetStoreLimiter().StoreLimitScene(limitType)
 }
 
 // GetProgressByID returns the progress details for a given store ID.

server/server.go

@@ -891,18 +891,18 @@ func (s *Server) SetReplicationConfig(cfg config.ReplicationConfig) error {
 	}
 	old := s.persistOptions.GetReplicationConfig()
 	if cfg.EnablePlacementRules != old.EnablePlacementRules {
-		raftCluster := s.GetRaftCluster()
-		if raftCluster == nil {
+		rc := s.GetRaftCluster()
+		if rc == nil {
 			return errs.ErrNotBootstrapped.GenWithStackByArgs()
 		}
 		if cfg.EnablePlacementRules {
 			// initialize rule manager.
-			if err := raftCluster.GetRuleManager().Initialize(int(cfg.MaxReplicas), cfg.LocationLabels); err != nil {
+			if err := rc.GetRuleManager().Initialize(int(cfg.MaxReplicas), cfg.LocationLabels); err != nil {
 				return err
 			}
 		} else {
 			// NOTE: can be removed after placement rules feature is enabled by default.
-			for _, s := range raftCluster.GetStores() {
+			for _, s := range rc.GetStores() {
 				if !s.IsRemoved() && s.IsTiFlash() {
 					return errors.New("cannot disable placement rules with TiFlash nodes")
 				}
@@ -912,8 +912,12 @@ func (s *Server) SetReplicationConfig(cfg config.ReplicationConfig) error {
 
 	var rule *placement.Rule
 	if cfg.EnablePlacementRules {
+		rc := s.GetRaftCluster()
+		if rc == nil {
+			return errs.ErrNotBootstrapped.GenWithStackByArgs()
+		}
 		// replication.MaxReplicas won't work when placement rule is enabled and not only have one default rule.
-		defaultRule := s.GetRaftCluster().GetRuleManager().GetRule("pd", "default")
+		defaultRule := rc.GetRuleManager().GetRule("pd", "default")
 
 		CheckInDefaultRule := func() error {
 			// replication config  won't work when placement rule is enabled and exceeds one default rule
@@ -939,7 +943,11 @@ func (s *Server) SetReplicationConfig(cfg config.ReplicationConfig) error {
 	if rule != nil {
 		rule.Count = int(cfg.MaxReplicas)
 		rule.LocationLabels = cfg.LocationLabels
-		if err := s.GetRaftCluster().GetRuleManager().SetRule(rule); err != nil {
+		rc := s.GetRaftCluster()
+		if rc == nil {
+			return errs.ErrNotBootstrapped.GenWithStackByArgs()
+		}
+		if err := rc.GetRuleManager().SetRule(rule); err != nil {
 			log.Error("failed to update rule count",
 				errs.ZapError(err))
 			return err
@@ -951,7 +959,11 @@ func (s *Server) SetReplicationConfig(cfg config.ReplicationConfig) error {
 		s.persistOptions.SetReplicationConfig(old)
 		if rule != nil {
 			rule.Count = int(old.MaxReplicas)
-			if e := s.GetRaftCluster().GetRuleManager().SetRule(rule); e != nil {
+			rc := s.GetRaftCluster()
+			if rc == nil {
+				return errs.ErrNotBootstrapped.GenWithStackByArgs()
+			}
+			if e := rc.GetRuleManager().SetRule(rule); e != nil {
 				log.Error("failed to roll back count of rule when update replication config", errs.ZapError(e))
 			}
 		}
@@ -1136,18 +1148,18 @@ func (s *Server) GetServerOption() *config.PersistOptions {
 
 // GetMetaRegions gets meta regions from cluster.
 func (s *Server) GetMetaRegions() []*metapb.Region {
-	cluster := s.GetRaftCluster()
-	if cluster != nil {
-		return cluster.GetMetaRegions()
+	rc := s.GetRaftCluster()
+	if rc != nil {
+		return rc.GetMetaRegions()
 	}
 	return nil
 }
 
 // GetRegions gets regions from cluster.
 func (s *Server) GetRegions() []*core.RegionInfo {
-	cluster := s.GetRaftCluster()
-	if cluster != nil {
-		return cluster.GetRegions()
+	rc := s.GetRaftCluster()
+	if rc != nil {
+		return rc.GetRegions()
 	}
 	return nil
 }
@@ -1253,9 +1265,9 @@ func (s *Server) SetReplicationModeConfig(cfg config.ReplicationModeConfig) erro
 	}
 	log.Info("replication mode config is updated", zap.Reflect("new", cfg), zap.Reflect("old", old))
 
-	cluster := s.GetRaftCluster()
-	if cluster != nil {
-		err := cluster.GetReplicationMode().UpdateConfig(cfg)
+	rc := s.GetRaftCluster()
+	if rc != nil {
+		err := rc.GetReplicationMode().UpdateConfig(cfg)
 		if err != nil {
 			log.Warn("failed to update replication mode", errs.ZapError(err))
 			// revert to old config

tests/server/api/api_test.go

@@ -742,6 +742,46 @@ func (s *testProgressSuite) TestPreparingProgress(c *C) {
 	c.Assert(failpoint.Disable("github.com/tikv/pd/server/cluster/highFrequencyClusterJobs"), IsNil)
 }
 
+func (s *testProgressSuite) TestSendApiWhenRestartRaftCluster(c *C) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	cluster, err := tests.NewTestCluster(ctx, 3, func(conf *config.Config, serverName string) {
+		conf.Replication.MaxReplicas = 1
+	})
+	c.Assert(err, IsNil)
+	defer cluster.Destroy()
+
+	err = cluster.RunInitialServers()
+	c.Assert(err, IsNil)
+	leader := cluster.GetServer(cluster.WaitLeader())
+
+	grpcPDClient := testutil.MustNewGrpcClient(c, leader.GetAddr())
+	clusterID := leader.GetClusterID()
+	req := &pdpb.BootstrapRequest{
+		Header: testutil.NewRequestHeader(clusterID),
+		Store:  &metapb.Store{Id: 1, Address: "127.0.0.1:0"},
+		Region: &metapb.Region{Id: 2, Peers: []*metapb.Peer{{Id: 3, StoreId: 1, Role: metapb.PeerRole_Voter}}},
+	}
+	resp, err := grpcPDClient.Bootstrap(context.Background(), req)
+	c.Assert(err, IsNil)
+	c.Assert(resp.GetHeader().GetError(), IsNil)
+
+	// Mock restart raft cluster
+	rc := leader.GetRaftCluster()
+	c.Assert(rc, NotNil)
+	rc.Stop()
+
+	// Mock client-go will still send request
+	output := sendRequest(c, leader.GetAddr()+"/pd/api/v1/min-resolved-ts", http.MethodGet, http.StatusInternalServerError)
+
+	c.Assert(strings.Contains(string(output), "TiKV cluster not bootstrapped, please start TiKV first"), IsTrue)
+
+	err = rc.Start(leader.GetServer())
+	c.Assert(err, IsNil)
+	rc = leader.GetRaftCluster()
+	c.Assert(rc, NotNil)
+}
+
 func sendRequest(c *C, url string, method string, statusCode int) []byte {
 	req, _ := http.NewRequest(method, url, nil)
 	resp, err := dialClient.Do(req)