package weed_server import ( "context" "fmt" "github.com/chrislusf/seaweedfs/weed/storage/backend" "net" "strings" "time" "github.com/chrislusf/raft" "google.golang.org/grpc/peer" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/master_pb" "github.com/chrislusf/seaweedfs/weed/storage/needle" "github.com/chrislusf/seaweedfs/weed/topology" ) func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServer) error { var dn *topology.DataNode defer func() { if dn != nil { // if the volume server disconnects and reconnects quickly // the unregister and register can race with each other ms.Topo.UnRegisterDataNode(dn) glog.V(0).Infof("unregister disconnected volume server %s:%d", dn.Ip, dn.Port) message := &master_pb.VolumeLocation{ Url: dn.Url(), PublicUrl: dn.PublicUrl, } for _, v := range dn.GetVolumes() { message.DeletedVids = append(message.DeletedVids, uint32(v.Id)) } for _, s := range dn.GetEcShards() { message.DeletedVids = append(message.DeletedVids, uint32(s.VolumeId)) } if len(message.DeletedVids) > 0 { ms.clientChansLock.RLock() for _, ch := range ms.clientChans { ch <- message } ms.clientChansLock.RUnlock() } } }() for { heartbeat, err := stream.Recv() if err != nil { if dn != nil { glog.Warningf("SendHeartbeat.Recv server %s:%d : %v", dn.Ip, dn.Port, err) } else { glog.Warningf("SendHeartbeat.Recv: %v", err) } return err } ms.Topo.Sequence.SetMax(heartbeat.MaxFileKey) if dn == nil { dcName, rackName := ms.Topo.Configuration.Locate(heartbeat.Ip, heartbeat.DataCenter, heartbeat.Rack) dc := ms.Topo.GetOrCreateDataCenter(dcName) rack := dc.GetOrCreateRack(rackName) dn = rack.GetOrCreateDataNode(heartbeat.Ip, int(heartbeat.Port), heartbeat.PublicUrl, heartbeat.MaxVolumeCounts) glog.V(0).Infof("added volume server %v:%d", heartbeat.GetIp(), heartbeat.GetPort()) if err := stream.Send(&master_pb.HeartbeatResponse{ VolumeSizeLimit: uint64(ms.option.VolumeSizeLimitMB) * 1024 * 1024, }); err != nil { glog.Warningf("SendHeartbeat.Send volume size to %s:%d %v", dn.Ip, dn.Port, err) return err } } dn.AdjustMaxVolumeCounts(heartbeat.MaxVolumeCounts) glog.V(4).Infof("master received heartbeat %s", heartbeat.String()) message := &master_pb.VolumeLocation{ Url: dn.Url(), PublicUrl: dn.PublicUrl, DataCenter: string(dn.GetDataCenter().Id()), } if len(heartbeat.NewVolumes) > 0 || len(heartbeat.DeletedVolumes) > 0 { // process delta volume ids if exists for fast volume id updates for _, volInfo := range heartbeat.NewVolumes { message.NewVids = append(message.NewVids, volInfo.Id) } for _, volInfo := range heartbeat.DeletedVolumes { message.DeletedVids = append(message.DeletedVids, volInfo.Id) } // update master internal volume layouts ms.Topo.IncrementalSyncDataNodeRegistration(heartbeat.NewVolumes, heartbeat.DeletedVolumes, dn) } if len(heartbeat.Volumes) > 0 || heartbeat.HasNoVolumes { // process heartbeat.Volumes newVolumes, deletedVolumes := ms.Topo.SyncDataNodeRegistration(heartbeat.Volumes, dn) for _, v := range newVolumes { glog.V(0).Infof("master see new volume %d from %s", uint32(v.Id), dn.Url()) message.NewVids = append(message.NewVids, uint32(v.Id)) } for _, v := range deletedVolumes { glog.V(0).Infof("master see deleted volume %d from %s", uint32(v.Id), dn.Url()) message.DeletedVids = append(message.DeletedVids, uint32(v.Id)) } } if len(heartbeat.NewEcShards) > 0 || len(heartbeat.DeletedEcShards) > 0 { // update master internal volume layouts ms.Topo.IncrementalSyncDataNodeEcShards(heartbeat.NewEcShards, heartbeat.DeletedEcShards, dn) for _, s := range heartbeat.NewEcShards { message.NewVids = append(message.NewVids, s.Id) } for _, s := range heartbeat.DeletedEcShards { if dn.HasVolumesById(needle.VolumeId(s.Id)) { continue } message.DeletedVids = append(message.DeletedVids, s.Id) } } if len(heartbeat.EcShards) > 0 || heartbeat.HasNoEcShards { glog.V(1).Infof("master received ec shards from %s: %+v", dn.Url(), heartbeat.EcShards) newShards, deletedShards := ms.Topo.SyncDataNodeEcShards(heartbeat.EcShards, dn) // broadcast the ec vid changes to master clients for _, s := range newShards { message.NewVids = append(message.NewVids, uint32(s.VolumeId)) } for _, s := range deletedShards { if dn.HasVolumesById(s.VolumeId) { continue } message.DeletedVids = append(message.DeletedVids, uint32(s.VolumeId)) } } if len(message.NewVids) > 0 || len(message.DeletedVids) > 0 { ms.clientChansLock.RLock() for host, ch := range ms.clientChans { glog.V(0).Infof("master send to %s: %s", host, message.String()) ch <- message } ms.clientChansLock.RUnlock() } // tell the volume servers about the leader newLeader, err := ms.Topo.Leader() if err != nil { glog.Warningf("SendHeartbeat find leader: %v", err) return err } if err := stream.Send(&master_pb.HeartbeatResponse{ Leader: newLeader, }); err != nil { glog.Warningf("SendHeartbeat.Send response to to %s:%d %v", dn.Ip, dn.Port, err) return err } } } // KeepConnected keep a stream gRPC call to the master. Used by clients to know the master is up. // And clients gets the up-to-date list of volume locations func (ms *MasterServer) KeepConnected(stream master_pb.Seaweed_KeepConnectedServer) error { req, err := stream.Recv() if err != nil { return err } if !ms.Topo.IsLeader() { return ms.informNewLeader(stream) } peerAddress := findClientAddress(stream.Context(), req.GrpcPort) // buffer by 1 so we don't end up getting stuck writing to stopChan forever stopChan := make(chan bool, 1) clientName, messageChan := ms.addClient(req.Name, peerAddress) defer ms.deleteClient(clientName) for _, message := range ms.Topo.ToVolumeLocations() { if err := stream.Send(message); err != nil { return err } } go func() { for { _, err := stream.Recv() if err != nil { glog.V(2).Infof("- client %v: %v", clientName, err) stopChan <- true break } } }() ticker := time.NewTicker(5 * time.Second) for { select { case message := <-messageChan: if err := stream.Send(message); err != nil { glog.V(0).Infof("=> client %v: %+v", clientName, message) return err } case <-ticker.C: if !ms.Topo.IsLeader() { return ms.informNewLeader(stream) } case <-stopChan: return nil } } } func (ms *MasterServer) informNewLeader(stream master_pb.Seaweed_KeepConnectedServer) error { leader, err := ms.Topo.Leader() if err != nil { glog.Errorf("topo leader: %v", err) return raft.NotLeaderError } if err := stream.Send(&master_pb.VolumeLocation{ Leader: leader, }); err != nil { return err } return nil } func (ms *MasterServer) addClient(clientType string, clientAddress string) (clientName string, messageChan chan *master_pb.VolumeLocation) { clientName = clientType + "@" + clientAddress glog.V(0).Infof("+ client %v", clientName) // we buffer this because otherwise we end up in a potential deadlock where // the KeepConnected loop is no longer listening on this channel but we're // trying to send to it in SendHeartbeat and so we can't lock the // clientChansLock to remove the channel and we're stuck writing to it // 100 is probably overkill messageChan = make(chan *master_pb.VolumeLocation, 100) ms.clientChansLock.Lock() ms.clientChans[clientName] = messageChan ms.clientChansLock.Unlock() return } func (ms *MasterServer) deleteClient(clientName string) { glog.V(0).Infof("- client %v", clientName) ms.clientChansLock.Lock() delete(ms.clientChans, clientName) ms.clientChansLock.Unlock() } func findClientAddress(ctx context.Context, grpcPort uint32) string { // fmt.Printf("FromContext %+v\n", ctx) pr, ok := peer.FromContext(ctx) if !ok { glog.Error("failed to get peer from ctx") return "" } if pr.Addr == net.Addr(nil) { glog.Error("failed to get peer address") return "" } if grpcPort == 0 { return pr.Addr.String() } if tcpAddr, ok := pr.Addr.(*net.TCPAddr); ok { externalIP := tcpAddr.IP return fmt.Sprintf("%s:%d", externalIP, grpcPort) } return pr.Addr.String() } func (ms *MasterServer) ListMasterClients(ctx context.Context, req *master_pb.ListMasterClientsRequest) (*master_pb.ListMasterClientsResponse, error) { resp := &master_pb.ListMasterClientsResponse{} ms.clientChansLock.RLock() defer ms.clientChansLock.RUnlock() for k := range ms.clientChans { if strings.HasPrefix(k, req.ClientType+"@") { resp.GrpcAddresses = append(resp.GrpcAddresses, k[len(req.ClientType)+1:]) } } return resp, nil } func (ms *MasterServer) GetMasterConfiguration(ctx context.Context, req *master_pb.GetMasterConfigurationRequest) (*master_pb.GetMasterConfigurationResponse, error) { // tell the volume servers about the leader leader, _ := ms.Topo.Leader() resp := &master_pb.GetMasterConfigurationResponse{ MetricsAddress: ms.option.MetricsAddress, MetricsIntervalSeconds: uint32(ms.option.MetricsIntervalSec), StorageBackends: backend.ToPbStorageBackends(), DefaultReplication: ms.option.DefaultReplicaPlacement, Leader: leader, } return resp, nil }