add volume tailer

4 files changed, 227 insertions, 147 deletions

diff --git a/unmaintained/volume_tailer/volume_tailer.go b/unmaintained/volume_tailer/volume_tailer.go
new file mode 100644
index 000000000..22c3ebab4
--- /dev/null
+++ b/unmaintained/volume_tailer/volume_tailer.go
@@ -0,0 +1,74 @@
+package main
+
+import (
+	"context"
+	"flag"
+
+	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	weed_server "github.com/chrislusf/seaweedfs/weed/server"
+	"github.com/chrislusf/seaweedfs/weed/storage"
+	"github.com/spf13/viper"
+
+	"io"
+	"log"
+)
+
+var (
+	master         = flag.String("master", "localhost:9333", "master server host and port")
+	volumeId       = flag.Int("volumeId", -1, "a volume id")
+	timeoutSeconds = flag.Int("timeoutSeconds", 0, "disconnect if no activity after these seconds")
+)
+
+func main() {
+	flag.Parse()
+
+	weed_server.LoadConfiguration("security", false)
+	grpcDialOption := security.LoadClientTLS(viper.Sub("grpc"), "client")
+
+	vid := storage.VolumeId(*volumeId)
+
+	// find volume location, replication, ttl info
+	lookup, err := operation.Lookup(*master, vid.String())
+	if err != nil {
+		log.Printf("Error looking up volume %d: %v", vid, err)
+		return
+	}
+	volumeServer := lookup.Locations[0].Url
+	log.Printf("volume %d is on volume server %s", vid, volumeServer)
+
+	err = operation.WithVolumeServerClient(volumeServer, grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+
+		stream, err := client.VolumeTail(context.Background(), &volume_server_pb.VolumeTailRequest{
+			VolumeId:        uint32(vid),
+			SinceNs:         0,
+			DrainingSeconds: uint32(*timeoutSeconds),
+		})
+		if err != nil {
+			return err
+		}
+
+		for {
+			resp, recvErr := stream.Recv()
+			if recvErr != nil {
+				if recvErr == io.EOF {
+					break
+				} else {
+					return recvErr
+				}
+			}
+
+			println("header:", len(resp.NeedleHeader), "body:", len(resp.NeedleBody))
+		}
+
+		return nil
+
+	})
+
+	if err != nil {
+		log.Printf("Error VolumeTail volume %d: %v", vid, err)
+	}
+
+
+}
diff --git a/weed/pb/volume_server.proto b/weed/pb/volume_server.proto
index 4a41c7104..949eeb49a 100644
--- a/weed/pb/volume_server.proto
+++ b/weed/pb/volume_server.proto
@@ -42,7 +42,7 @@ service VolumeServer {
     rpc CopyFile (CopyFileRequest) returns (stream CopyFileResponse) {
     }
 
-    rpc VolumeStreamFollow (VolumeStreamFollowRequest) returns (stream VolumeStreamFollowResponse) {
+    rpc VolumeTail (VolumeTailRequest) returns (stream VolumeTailResponse) {
     }
 
 }
@@ -166,12 +166,12 @@ message CopyFileResponse {
     bytes file_content = 1;
 }
 
-message VolumeStreamFollowRequest {
+message VolumeTailRequest {
     uint32 volume_id = 1;
     uint64 since_ns = 2;
     uint32 drainingSeconds = 3;
 }
-message VolumeStreamFollowResponse {
+message VolumeTailResponse {
     bytes needle_header = 1;
     bytes needle_body = 2;
 }
diff --git a/weed/pb/volume_server_pb/volume_server.pb.go b/weed/pb/volume_server_pb/volume_server.pb.go
index 269774aa4..bb7711865 100644
--- a/weed/pb/volume_server_pb/volume_server.pb.go
+++ b/weed/pb/volume_server_pb/volume_server.pb.go
@@ -39,8 +39,8 @@ It has these top-level messages:
 	VolumeCopyResponse
 	CopyFileRequest
 	CopyFileResponse
-	VolumeStreamFollowRequest
-	VolumeStreamFollowResponse
+	VolumeTailRequest
+	VolumeTailResponse
 	ReadVolumeFileStatusRequest
 	ReadVolumeFileStatusResponse
 	DiskStatus
@@ -636,56 +636,56 @@ func (m *CopyFileResponse) GetFileContent() []byte {
 	return nil
 }
 
-type VolumeStreamFollowRequest struct {
+type VolumeTailRequest struct {
 	VolumeId        uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
 	SinceNs         uint64 `protobuf:"varint,2,opt,name=since_ns,json=sinceNs" json:"since_ns,omitempty"`
 	DrainingSeconds uint32 `protobuf:"varint,3,opt,name=drainingSeconds" json:"drainingSeconds,omitempty"`
 }
 
-func (m *VolumeStreamFollowRequest) Reset()                    { *m = VolumeStreamFollowRequest{} }
-func (m *VolumeStreamFollowRequest) String() string            { return proto.CompactTextString(m) }
-func (*VolumeStreamFollowRequest) ProtoMessage()               {}
-func (*VolumeStreamFollowRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{30} }
+func (m *VolumeTailRequest) Reset()                    { *m = VolumeTailRequest{} }
+func (m *VolumeTailRequest) String() string            { return proto.CompactTextString(m) }
+func (*VolumeTailRequest) ProtoMessage()               {}
+func (*VolumeTailRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{30} }
 
-func (m *VolumeStreamFollowRequest) GetVolumeId() uint32 {
+func (m *VolumeTailRequest) GetVolumeId() uint32 {
 	if m != nil {
 		return m.VolumeId
 	}
 	return 0
 }
 
-func (m *VolumeStreamFollowRequest) GetSinceNs() uint64 {
+func (m *VolumeTailRequest) GetSinceNs() uint64 {
 	if m != nil {
 		return m.SinceNs
 	}
 	return 0
 }
 
-func (m *VolumeStreamFollowRequest) GetDrainingSeconds() uint32 {
+func (m *VolumeTailRequest) GetDrainingSeconds() uint32 {
 	if m != nil {
 		return m.DrainingSeconds
 	}
 	return 0
 }
 
-type VolumeStreamFollowResponse struct {
+type VolumeTailResponse struct {
 	NeedleHeader []byte `protobuf:"bytes,1,opt,name=needle_header,json=needleHeader,proto3" json:"needle_header,omitempty"`
 	NeedleBody   []byte `protobuf:"bytes,2,opt,name=needle_body,json=needleBody,proto3" json:"needle_body,omitempty"`
 }
 
-func (m *VolumeStreamFollowResponse) Reset()                    { *m = VolumeStreamFollowResponse{} }
-func (m *VolumeStreamFollowResponse) String() string            { return proto.CompactTextString(m) }
-func (*VolumeStreamFollowResponse) ProtoMessage()               {}
-func (*VolumeStreamFollowResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{31} }
+func (m *VolumeTailResponse) Reset()                    { *m = VolumeTailResponse{} }
+func (m *VolumeTailResponse) String() string            { return proto.CompactTextString(m) }
+func (*VolumeTailResponse) ProtoMessage()               {}
+func (*VolumeTailResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{31} }
 
-func (m *VolumeStreamFollowResponse) GetNeedleHeader() []byte {
+func (m *VolumeTailResponse) GetNeedleHeader() []byte {
 	if m != nil {
 		return m.NeedleHeader
 	}
 	return nil
 }
 
-func (m *VolumeStreamFollowResponse) GetNeedleBody() []byte {
+func (m *VolumeTailResponse) GetNeedleBody() []byte {
 	if m != nil {
 		return m.NeedleBody
 	}
@@ -899,8 +899,8 @@ func init() {
 	proto.RegisterType((*VolumeCopyResponse)(nil), "volume_server_pb.VolumeCopyResponse")
 	proto.RegisterType((*CopyFileRequest)(nil), "volume_server_pb.CopyFileRequest")
 	proto.RegisterType((*CopyFileResponse)(nil), "volume_server_pb.CopyFileResponse")
-	proto.RegisterType((*VolumeStreamFollowRequest)(nil), "volume_server_pb.VolumeStreamFollowRequest")
-	proto.RegisterType((*VolumeStreamFollowResponse)(nil), "volume_server_pb.VolumeStreamFollowResponse")
+	proto.RegisterType((*VolumeTailRequest)(nil), "volume_server_pb.VolumeTailRequest")
+	proto.RegisterType((*VolumeTailResponse)(nil), "volume_server_pb.VolumeTailResponse")
 	proto.RegisterType((*ReadVolumeFileStatusRequest)(nil), "volume_server_pb.ReadVolumeFileStatusRequest")
 	proto.RegisterType((*ReadVolumeFileStatusResponse)(nil), "volume_server_pb.ReadVolumeFileStatusResponse")
 	proto.RegisterType((*DiskStatus)(nil), "volume_server_pb.DiskStatus")
@@ -935,7 +935,7 @@ type VolumeServerClient interface {
 	VolumeCopy(ctx context.Context, in *VolumeCopyRequest, opts ...grpc.CallOption) (*VolumeCopyResponse, error)
 	ReadVolumeFileStatus(ctx context.Context, in *ReadVolumeFileStatusRequest, opts ...grpc.CallOption) (*ReadVolumeFileStatusResponse, error)
 	CopyFile(ctx context.Context, in *CopyFileRequest, opts ...grpc.CallOption) (VolumeServer_CopyFileClient, error)
-	VolumeStreamFollow(ctx context.Context, in *VolumeStreamFollowRequest, opts ...grpc.CallOption) (VolumeServer_VolumeStreamFollowClient, error)
+	VolumeTail(ctx context.Context, in *VolumeTailRequest, opts ...grpc.CallOption) (VolumeServer_VolumeTailClient, error)
 }
 
 type volumeServerClient struct {
@@ -1127,12 +1127,12 @@ func (x *volumeServerCopyFileClient) Recv() (*CopyFileResponse, error) {
 	return m, nil
 }
 
-func (c *volumeServerClient) VolumeStreamFollow(ctx context.Context, in *VolumeStreamFollowRequest, opts ...grpc.CallOption) (VolumeServer_VolumeStreamFollowClient, error) {
-	stream, err := grpc.NewClientStream(ctx, &_VolumeServer_serviceDesc.Streams[2], c.cc, "/volume_server_pb.VolumeServer/VolumeStreamFollow", opts...)
+func (c *volumeServerClient) VolumeTail(ctx context.Context, in *VolumeTailRequest, opts ...grpc.CallOption) (VolumeServer_VolumeTailClient, error) {
+	stream, err := grpc.NewClientStream(ctx, &_VolumeServer_serviceDesc.Streams[2], c.cc, "/volume_server_pb.VolumeServer/VolumeTail", opts...)
 	if err != nil {
 		return nil, err
 	}
-	x := &volumeServerVolumeStreamFollowClient{stream}
+	x := &volumeServerVolumeTailClient{stream}
 	if err := x.ClientStream.SendMsg(in); err != nil {
 		return nil, err
 	}
@@ -1142,17 +1142,17 @@ func (c *volumeServerClient) VolumeStreamFollow(ctx context.Context, in *VolumeS
 	return x, nil
 }
 
-type VolumeServer_VolumeStreamFollowClient interface {
-	Recv() (*VolumeStreamFollowResponse, error)
+type VolumeServer_VolumeTailClient interface {
+	Recv() (*VolumeTailResponse, error)
 	grpc.ClientStream
 }
 
-type volumeServerVolumeStreamFollowClient struct {
+type volumeServerVolumeTailClient struct {
 	grpc.ClientStream
 }
 
-func (x *volumeServerVolumeStreamFollowClient) Recv() (*VolumeStreamFollowResponse, error) {
-	m := new(VolumeStreamFollowResponse)
+func (x *volumeServerVolumeTailClient) Recv() (*VolumeTailResponse, error) {
+	m := new(VolumeTailResponse)
 	if err := x.ClientStream.RecvMsg(m); err != nil {
 		return nil, err
 	}
@@ -1179,7 +1179,7 @@ type VolumeServerServer interface {
 	VolumeCopy(context.Context, *VolumeCopyRequest) (*VolumeCopyResponse, error)
 	ReadVolumeFileStatus(context.Context, *ReadVolumeFileStatusRequest) (*ReadVolumeFileStatusResponse, error)
 	CopyFile(*CopyFileRequest, VolumeServer_CopyFileServer) error
-	VolumeStreamFollow(*VolumeStreamFollowRequest, VolumeServer_VolumeStreamFollowServer) error
+	VolumeTail(*VolumeTailRequest, VolumeServer_VolumeTailServer) error
 }
 
 func RegisterVolumeServerServer(s *grpc.Server, srv VolumeServerServer) {
@@ -1462,24 +1462,24 @@ func (x *volumeServerCopyFileServer) Send(m *CopyFileResponse) error {
 	return x.ServerStream.SendMsg(m)
 }
 
-func _VolumeServer_VolumeStreamFollow_Handler(srv interface{}, stream grpc.ServerStream) error {
-	m := new(VolumeStreamFollowRequest)
+func _VolumeServer_VolumeTail_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(VolumeTailRequest)
 	if err := stream.RecvMsg(m); err != nil {
 		return err
 	}
-	return srv.(VolumeServerServer).VolumeStreamFollow(m, &volumeServerVolumeStreamFollowServer{stream})
+	return srv.(VolumeServerServer).VolumeTail(m, &volumeServerVolumeTailServer{stream})
 }
 
-type VolumeServer_VolumeStreamFollowServer interface {
-	Send(*VolumeStreamFollowResponse) error
+type VolumeServer_VolumeTailServer interface {
+	Send(*VolumeTailResponse) error
 	grpc.ServerStream
 }
 
-type volumeServerVolumeStreamFollowServer struct {
+type volumeServerVolumeTailServer struct {
 	grpc.ServerStream
 }
 
-func (x *volumeServerVolumeStreamFollowServer) Send(m *VolumeStreamFollowResponse) error {
+func (x *volumeServerVolumeTailServer) Send(m *VolumeTailResponse) error {
 	return x.ServerStream.SendMsg(m)
 }
 
@@ -1552,8 +1552,8 @@ var _VolumeServer_serviceDesc = grpc.ServiceDesc{
 			ServerStreams: true,
 		},
 		{
-			StreamName:    "VolumeStreamFollow",
-			Handler:       _VolumeServer_VolumeStreamFollow_Handler,
+			StreamName:    "VolumeTail",
+			Handler:       _VolumeServer_VolumeTail_Handler,
 			ServerStreams: true,
 		},
 	},
@@ -1563,86 +1563,86 @@ var _VolumeServer_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("volume_server.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
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 }
diff --git a/weed/server/volume_grpc_stream_follow.go b/weed/server/volume_grpc_stream_follow.go
index 7c01e4b9c..52a9c1473 100644
--- a/weed/server/volume_grpc_stream_follow.go
+++ b/weed/server/volume_grpc_stream_follow.go
@@ -9,57 +9,63 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage"
 )
 
-func (vs *VolumeServer) VolumeStreamFollow(req *volume_server_pb.VolumeStreamFollowRequest, stream volume_server_pb.VolumeServer_VolumeStreamFollowServer) error {
+func (vs *VolumeServer) VolumeTail(req *volume_server_pb.VolumeTailRequest, stream volume_server_pb.VolumeServer_VolumeTailServer) error {
 
 	v := vs.store.GetVolume(storage.VolumeId(req.VolumeId))
 	if v == nil {
 		return fmt.Errorf("not found volume id %d", req.VolumeId)
 	}
 
+	defer glog.V(1).Infof("tailing volume %d finished", v.Id)
+
 	lastTimestampNs := req.SinceNs
 	drainingSeconds := req.DrainingSeconds
 
-	ticker := time.NewTicker(time.Second)
-
 	for {
-		select {
-		case <-ticker.C:
-			lastProcessedTimestampNs, err := sendNeedlesSince(stream, v, lastTimestampNs)
-			if err != nil {
-				return fmt.Errorf("streamFollow: %v", err)
-			}
-			if req.DrainingSeconds == 0 {
-				continue
-			}
-			if lastProcessedTimestampNs == lastTimestampNs {
-				drainingSeconds--
-				if drainingSeconds <= 0 {
-					return nil
-				}
-				glog.V(0).Infof("volume %d drains requests with %d seconds remaining ...", v.Id, drainingSeconds)
-			} else {
-				drainingSeconds = req.DrainingSeconds
-				glog.V(0).Infof("volume %d resets draining wait time to %d seconds", v.Id, drainingSeconds)
+		lastProcessedTimestampNs, err := sendNeedlesSince(stream, v, lastTimestampNs)
+		if err != nil {
+			glog.Infof("sendNeedlesSince: %v", err)
+			return fmt.Errorf("streamFollow: %v", err)
+		}
+		time.Sleep(2 * time.Second)
+
+		if req.DrainingSeconds == 0 {
+			continue
+		}
+		if lastProcessedTimestampNs == lastTimestampNs {
+			drainingSeconds--
+			if drainingSeconds <= 0 {
+				return nil
 			}
+			glog.V(1).Infof("tailing volume %d drains requests with %d seconds remaining", v.Id, drainingSeconds)
+		} else {
+			lastTimestampNs = lastProcessedTimestampNs
+			drainingSeconds = req.DrainingSeconds
+			glog.V(1).Infof("tailing volume %d resets draining wait time to %d seconds", v.Id, drainingSeconds)
 		}
+
 	}
 
 }
 
-func sendNeedlesSince(stream volume_server_pb.VolumeServer_VolumeStreamFollowServer, v *storage.Volume, lastTimestampNs uint64) (lastProcessedTimestampNs uint64, err error) {
+func sendNeedlesSince(stream volume_server_pb.VolumeServer_VolumeTailServer, v *storage.Volume, lastTimestampNs uint64) (lastProcessedTimestampNs uint64, err error) {
 
 	foundOffset, isLastOne, err := v.BinarySearchByAppendAtNs(lastTimestampNs)
 	if err != nil {
 		return 0, fmt.Errorf("fail to locate by appendAtNs %d: %s", lastTimestampNs, err)
 	}
 
+	// log.Printf("reading ts %d offset %d isLast %v", lastTimestampNs, foundOffset, isLastOne)
+
 	if isLastOne {
-		return lastTimestampNs, nil
+		// need to heart beat to the client to ensure the connection health
+		sendErr := stream.Send(&volume_server_pb.VolumeTailResponse{})
+		return lastTimestampNs, sendErr
 	}
 
 	err = storage.ScanVolumeFileNeedleFrom(v.Version(), v.DataFile(), foundOffset.ToAcutalOffset(), func(needleHeader, needleBody []byte, needleAppendAtNs uint64) error {
 
-		sendErr := stream.Send(&volume_server_pb.VolumeStreamFollowResponse{
+		sendErr := stream.Send(&volume_server_pb.VolumeTailResponse{
 			NeedleHeader: needleHeader,
 			NeedleBody:   needleBody,
 		})