gRpc for master~volume heartbeat

weed/server/volume_grpc_client.go

@@ -0,0 +1,74 @@
+package weed_server
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/storage"
+	"golang.org/x/net/context"
+	"google.golang.org/grpc"
+)
+
+func (vs *VolumeServer) heartbeat() {
+
+	glog.V(0).Infof("Volume server bootstraps with master %s", vs.GetMasterNode())
+	vs.masterNodes = storage.NewMasterNodes(vs.masterNode)
+	vs.store.SetDataCenter(vs.dataCenter)
+	vs.store.SetRack(vs.rack)
+
+	for {
+		err := vs.doHeartbeat(time.Duration(vs.pulseSeconds) * time.Second)
+		if err != nil {
+			glog.V(0).Infof("heartbeat error: %v", err)
+			time.Sleep(time.Duration(3*vs.pulseSeconds) * time.Second)
+		}
+	}
+}
+
+func (vs *VolumeServer) doHeartbeat(sleepInterval time.Duration) error {
+
+	masterNode, err := vs.masterNodes.FindMaster()
+	if err != nil {
+		return fmt.Errorf("No master found: %v", err)
+	}
+
+	grpcConection, err := grpc.Dial(masterNode, grpc.WithInsecure())
+	if err != nil {
+		return fmt.Errorf("fail to dial: %v", err)
+	}
+	defer grpcConection.Close()
+
+	client := pb.NewSeaweedClient(grpcConection)
+	stream, err := client.SendHeartbeat(context.Background())
+	if err != nil {
+		glog.V(0).Infof("%v.SendHeartbeat(_) = _, %v", client, err)
+		return err
+	}
+	vs.SetMasterNode(masterNode)
+	glog.V(0).Infof("Heartbeat to %s", masterNode)
+
+	vs.store.Client = stream
+	defer func() { vs.store.Client = nil }()
+
+	go func() {
+		for {
+			in, err := stream.Recv()
+			if err != nil {
+				return
+			}
+			vs.store.VolumeSizeLimit = in.GetVolumeSizeLimit()
+			vs.guard.SecretKey = security.Secret(in.GetSecretKey())
+		}
+	}()
+
+	for {
+		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
+		}
+		time.Sleep(sleepInterval)
+	}
+}