package weed_server import ( "fmt" "time" "github.com/chrislusf/seaweedfs/weed/glog" "github.com/chrislusf/seaweedfs/weed/pb/master_pb" "github.com/chrislusf/seaweedfs/weed/security" "golang.org/x/net/context" "google.golang.org/grpc" ) func (vs *VolumeServer) GetMaster() string { return vs.currentMaster } func (vs *VolumeServer) heartbeat() { glog.V(0).Infof("Volume server start with masters: %v", vs.MasterNodes) vs.store.SetDataCenter(vs.dataCenter) vs.store.SetRack(vs.rack) var err error var newLeader string for { for _, master := range vs.MasterNodes { if newLeader != "" { master = newLeader } newLeader, err = vs.doHeartbeat(master, time.Duration(vs.pulseSeconds)*time.Second) if err != nil { glog.V(0).Infof("heartbeat error: %v", err) time.Sleep(time.Duration(vs.pulseSeconds) * time.Second) } } } } func (vs *VolumeServer) doHeartbeat(masterNode string, sleepInterval time.Duration) (newLeader string, err error) { grpcConection, err := grpc.Dial(masterNode, grpc.WithInsecure()) if err != nil { return "", fmt.Errorf("fail to dial: %v", err) } defer grpcConection.Close() client := master_pb.NewSeaweedClient(grpcConection) stream, err := client.SendHeartbeat(context.Background()) if err != nil { glog.V(0).Infof("SendHeartbeat to %s: %v", masterNode, err) return "", err } glog.V(0).Infof("Heartbeat to: %v", masterNode) vs.currentMaster = masterNode vs.store.Client = stream defer func() { vs.store.Client = nil }() doneChan := make(chan error, 1) go func() { for { in, err := stream.Recv() if err != nil { doneChan <- err return } if in.GetVolumeSizeLimit() != 0 { vs.store.VolumeSizeLimit = in.GetVolumeSizeLimit() } if in.GetSecretKey() != "" { vs.guard.SecretKey = security.Secret(in.GetSecretKey()) } if in.GetLeader() != "" && masterNode != in.GetLeader() { glog.V(0).Infof("Volume Server found a new master newLeader: %v instead of %v", in.GetLeader(), masterNode) newLeader = in.GetLeader() doneChan <- nil return } } }() if err = stream.Send(vs.store.CollectHeartbeat()); err != nil { glog.V(0).Infof("Volume Server Failed to talk with master %s: %v", masterNode, err) return "", err } tickChan := time.Tick(sleepInterval) for { select { case <-tickChan: if err = stream.Send(vs.store.CollectHeartbeat()); err != nil { glog.V(0).Infof("Volume Server Failed to talk with master %s: %v", masterNode, err) return "", err } case <-doneChan: return } } }