package wdclient import ( "context" "fmt" "math/rand" "sync" "time" "github.com/seaweedfs/seaweedfs/weed/stats" "github.com/seaweedfs/seaweedfs/weed/util" "google.golang.org/grpc" "github.com/seaweedfs/seaweedfs/weed/glog" "github.com/seaweedfs/seaweedfs/weed/pb" "github.com/seaweedfs/seaweedfs/weed/pb/master_pb" ) type MasterClient struct { FilerGroup string clientType string clientHost pb.ServerAddress rack string currentMaster pb.ServerAddress currentMasterLock sync.RWMutex masters map[string]pb.ServerAddress grpcDialOption grpc.DialOption vidMap vidMapCacheSize int OnPeerUpdate func(update *master_pb.ClusterNodeUpdate, startFrom time.Time) OnPeerUpdateLock sync.RWMutex } func NewMasterClient(grpcDialOption grpc.DialOption, filerGroup string, clientType string, clientHost pb.ServerAddress, clientDataCenter string, rack string, masters map[string]pb.ServerAddress) *MasterClient { return &MasterClient{ FilerGroup: filerGroup, clientType: clientType, clientHost: clientHost, rack: rack, masters: masters, grpcDialOption: grpcDialOption, vidMap: newVidMap(clientDataCenter), vidMapCacheSize: 5, } } func (mc *MasterClient) SetOnPeerUpdateFn(onPeerUpdate func(update *master_pb.ClusterNodeUpdate, startFrom time.Time)) { mc.OnPeerUpdateLock.Lock() mc.OnPeerUpdate = onPeerUpdate mc.OnPeerUpdateLock.Unlock() } func (mc *MasterClient) GetLookupFileIdFunction() LookupFileIdFunctionType { return mc.LookupFileIdWithFallback } func (mc *MasterClient) LookupFileIdWithFallback(fileId string) (fullUrls []string, err error) { fullUrls, err = mc.vidMap.LookupFileId(fileId) if err == nil && len(fullUrls) > 0 { return } err = pb.WithMasterClient(false, mc.GetMaster(), mc.grpcDialOption, false, func(client master_pb.SeaweedClient) error { resp, err := client.LookupVolume(context.Background(), &master_pb.LookupVolumeRequest{ VolumeOrFileIds: []string{fileId}, }) if err != nil { return fmt.Errorf("LookupVolume %s failed: %v", fileId, err) } for vid, vidLocation := range resp.VolumeIdLocations { for _, vidLoc := range vidLocation.Locations { loc := Location{ Url: vidLoc.Url, PublicUrl: vidLoc.PublicUrl, GrpcPort: int(vidLoc.GrpcPort), DataCenter: vidLoc.DataCenter, } mc.vidMap.addLocation(uint32(vid), loc) httpUrl := "http://" + loc.Url + "/" + fileId // Prefer same data center if mc.DataCenter != "" && mc.DataCenter == loc.DataCenter { fullUrls = append([]string{httpUrl}, fullUrls...) } else { fullUrls = append(fullUrls, httpUrl) } } } return nil }) return } func (mc *MasterClient) getCurrentMaster() pb.ServerAddress { mc.currentMasterLock.RLock() defer mc.currentMasterLock.RUnlock() return mc.currentMaster } func (mc *MasterClient) setCurrentMaster(master pb.ServerAddress) { mc.currentMasterLock.Lock() mc.currentMaster = master mc.currentMasterLock.Unlock() } func (mc *MasterClient) GetMaster() pb.ServerAddress { mc.WaitUntilConnected() return mc.getCurrentMaster() } func (mc *MasterClient) GetMasters() map[string]pb.ServerAddress { mc.WaitUntilConnected() return mc.masters } func (mc *MasterClient) WaitUntilConnected() { for { if mc.getCurrentMaster() != "" { return } time.Sleep(time.Duration(rand.Int31n(200)) * time.Millisecond) } } func (mc *MasterClient) KeepConnectedToMaster() { glog.V(1).Infof("%s.%s masterClient bootstraps with masters %v", mc.FilerGroup, mc.clientType, mc.masters) for { mc.tryAllMasters() time.Sleep(time.Second) } } func (mc *MasterClient) FindLeaderFromOtherPeers(myMasterAddress pb.ServerAddress) (leader string) { for _, master := range mc.masters { if master == myMasterAddress { continue } if grpcErr := pb.WithMasterClient(false, master, mc.grpcDialOption, false, func(client master_pb.SeaweedClient) error { ctx, cancel := context.WithTimeout(context.Background(), 120*time.Millisecond) defer cancel() resp, err := client.GetMasterConfiguration(ctx, &master_pb.GetMasterConfigurationRequest{}) if err != nil { return err } leader = resp.Leader return nil }); grpcErr != nil { glog.V(0).Infof("connect to %s: %v", master, grpcErr) } if leader != "" { glog.V(0).Infof("existing leader is %s", leader) return } } glog.V(0).Infof("No existing leader found!") return } func (mc *MasterClient) tryAllMasters() { var nextHintedLeader pb.ServerAddress for _, master := range mc.masters { nextHintedLeader = mc.tryConnectToMaster(master) for nextHintedLeader != "" { nextHintedLeader = mc.tryConnectToMaster(nextHintedLeader) } mc.setCurrentMaster("") } } func (mc *MasterClient) tryConnectToMaster(master pb.ServerAddress) (nextHintedLeader pb.ServerAddress) { glog.V(1).Infof("%s.%s masterClient Connecting to master %v", mc.FilerGroup, mc.clientType, master) stats.MasterClientConnectCounter.WithLabelValues("total").Inc() gprcErr := pb.WithMasterClient(true, master, mc.grpcDialOption, false, func(client master_pb.SeaweedClient) error { ctx, cancel := context.WithCancel(context.Background()) defer cancel() stream, err := client.KeepConnected(ctx) if err != nil { glog.V(1).Infof("%s.%s masterClient failed to keep connected to %s: %v", mc.FilerGroup, mc.clientType, master, err) stats.MasterClientConnectCounter.WithLabelValues(stats.FailedToKeepConnected).Inc() return err } if err = stream.Send(&master_pb.KeepConnectedRequest{ FilerGroup: mc.FilerGroup, DataCenter: mc.DataCenter, Rack: mc.rack, ClientType: mc.clientType, ClientAddress: string(mc.clientHost), Version: util.Version(), }); err != nil { glog.V(0).Infof("%s.%s masterClient failed to send to %s: %v", mc.FilerGroup, mc.clientType, master, err) stats.MasterClientConnectCounter.WithLabelValues(stats.FailedToSend).Inc() return err } glog.V(1).Infof("%s.%s masterClient Connected to %v", mc.FilerGroup, mc.clientType, master) resp, err := stream.Recv() if err != nil { glog.V(0).Infof("%s.%s masterClient failed to receive from %s: %v", mc.FilerGroup, mc.clientType, master, err) stats.MasterClientConnectCounter.WithLabelValues(stats.FailedToReceive).Inc() return err } // check if it is the leader to determine whether to reset the vidMap if resp.VolumeLocation != nil { if resp.VolumeLocation.Leader != "" && string(master) != resp.VolumeLocation.Leader { glog.V(0).Infof("master %v redirected to leader %v", master, resp.VolumeLocation.Leader) nextHintedLeader = pb.ServerAddress(resp.VolumeLocation.Leader) stats.MasterClientConnectCounter.WithLabelValues(stats.RedirectedToLeader).Inc() return nil } mc.resetVidMap() mc.updateVidMap(resp) } else { mc.resetVidMap() } mc.setCurrentMaster(master) for { resp, err := stream.Recv() if err != nil { glog.V(0).Infof("%s.%s masterClient failed to receive from %s: %v", mc.FilerGroup, mc.clientType, master, err) stats.MasterClientConnectCounter.WithLabelValues(stats.FailedToReceive).Inc() return err } if resp.VolumeLocation != nil { // maybe the leader is changed if resp.VolumeLocation.Leader != "" && string(mc.GetMaster()) != resp.VolumeLocation.Leader { glog.V(0).Infof("currentMaster %v redirected to leader %v", mc.GetMaster(), resp.VolumeLocation.Leader) nextHintedLeader = pb.ServerAddress(resp.VolumeLocation.Leader) stats.MasterClientConnectCounter.WithLabelValues(stats.RedirectedToLeader).Inc() return nil } mc.updateVidMap(resp) } if resp.ClusterNodeUpdate != nil { update := resp.ClusterNodeUpdate mc.OnPeerUpdateLock.RLock() if mc.OnPeerUpdate != nil { if update.FilerGroup == mc.FilerGroup { if update.IsAdd { glog.V(0).Infof("+ %s.%s %s leader:%v\n", update.FilerGroup, update.NodeType, update.Address, update.IsLeader) } else { glog.V(0).Infof("- %s.%s %s leader:%v\n", update.FilerGroup, update.NodeType, update.Address, update.IsLeader) } stats.MasterClientConnectCounter.WithLabelValues(stats.OnPeerUpdate).Inc() mc.OnPeerUpdate(update, time.Now()) } } mc.OnPeerUpdateLock.RUnlock() } } }) if gprcErr != nil { stats.MasterClientConnectCounter.WithLabelValues(stats.Failed).Inc() glog.V(1).Infof("%s.%s masterClient failed to connect with master %v: %v", mc.FilerGroup, mc.clientType, master, gprcErr) } return } func (mc *MasterClient) updateVidMap(resp *master_pb.KeepConnectedResponse) { // process new volume location glog.V(1).Infof("updateVidMap() resp.VolumeLocation.DataCenter %v", resp.VolumeLocation.DataCenter) loc := Location{ Url: resp.VolumeLocation.Url, PublicUrl: resp.VolumeLocation.PublicUrl, DataCenter: resp.VolumeLocation.DataCenter, GrpcPort: int(resp.VolumeLocation.GrpcPort), } for _, newVid := range resp.VolumeLocation.NewVids { glog.V(1).Infof("%s.%s: %s masterClient adds volume %d", mc.FilerGroup, mc.clientType, loc.Url, newVid) mc.addLocation(newVid, loc) } for _, deletedVid := range resp.VolumeLocation.DeletedVids { glog.V(1).Infof("%s.%s: %s masterClient removes volume %d", mc.FilerGroup, mc.clientType, loc.Url, deletedVid) mc.deleteLocation(deletedVid, loc) } for _, newEcVid := range resp.VolumeLocation.NewEcVids { glog.V(1).Infof("%s.%s: %s masterClient adds ec volume %d", mc.FilerGroup, mc.clientType, loc.Url, newEcVid) mc.addEcLocation(newEcVid, loc) } for _, deletedEcVid := range resp.VolumeLocation.DeletedEcVids { glog.V(1).Infof("%s.%s: %s masterClient removes ec volume %d", mc.FilerGroup, mc.clientType, loc.Url, deletedEcVid) mc.deleteEcLocation(deletedEcVid, loc) } } func (mc *MasterClient) WithClient(streamingMode bool, fn func(client master_pb.SeaweedClient) error) error { return util.Retry("master grpc", func() error { return pb.WithMasterClient(streamingMode, mc.GetMaster(), mc.grpcDialOption, false, func(client master_pb.SeaweedClient) error { return fn(client) }) }) } func (mc *MasterClient) resetVidMap() { tail := &vidMap{ vid2Locations: mc.vid2Locations, ecVid2Locations: mc.ecVid2Locations, DataCenter: mc.DataCenter, cache: mc.cache, } mc.vidMap = newVidMap(mc.DataCenter) mc.vidMap.cache = tail for i := 0; i < mc.vidMapCacheSize && tail.cache != nil; i++ { if i == mc.vidMapCacheSize-1 { tail.cache = nil } else { tail = tail.cache } } }