writing meta logs is working

other/java/client/src/main/proto/filer.proto

@@ -42,6 +42,9 @@ service SeaweedFiler {
     rpc GetFilerConfiguration (GetFilerConfigurationRequest) returns (GetFilerConfigurationResponse) {
     }
 
+    rpc ListenForEvents (ListenForEventsRequest) returns (stream FullEventNotification) {
+    }
+
 }
 
 //////////////////////////////////////////////////
@@ -230,3 +233,19 @@ message GetFilerConfigurationResponse {
     string dir_queues = 6;
     bool cipher = 7;
 }
+
+message ListenForEventsRequest {
+    string client_name = 1;
+    string directory = 2;
+    int64 since_sec = 3;
+}
+message FullEventNotification {
+    string directory = 1;
+    EventNotification event_notification = 2;
+}
+
+message LogEntry {
+    int64 ts_ns = 1;
+    int32 partition_key_hash = 2;
+    bytes data = 3;
+}

weed/filer2/filer.go

@@ -35,6 +35,7 @@ type Filer struct {
 	DirQueuesPath       string
 	buckets             *FilerBuckets
 	Cipher              bool
+	metaLogBuffer       *LogBuffer
 }
 
 func NewFiler(masters []string, grpcDialOption grpc.DialOption, filerGrpcPort uint32) *Filer {
@@ -44,6 +45,7 @@ func NewFiler(masters []string, grpcDialOption grpc.DialOption, filerGrpcPort ui
 		fileIdDeletionQueue: util.NewUnboundedQueue(),
 		GrpcDialOption:      grpcDialOption,
 	}
+	f.metaLogBuffer = NewLogBuffer(time.Minute, f.logFlushFunc)
 
 	go f.loopProcessingDeletion()
 

weed/filer2/filer_notify.go

@@ -1,9 +1,17 @@
 package filer2
 
 import (
+	"fmt"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/golang/protobuf/proto"
+
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/notification"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
 func (f *Filer) NotifyUpdateEvent(oldEntry, newEntry *Entry, deleteChunks bool) {
@@ -16,24 +24,123 @@ func (f *Filer) NotifyUpdateEvent(oldEntry, newEntry *Entry, deleteChunks bool)
 		return
 	}
 
+	println("key:", key)
+
+	if strings.HasPrefix(key, "/.meta") {
+		return
+	}
+
+	newParentPath := ""
+	if newEntry != nil {
+		newParentPath, _ = newEntry.FullPath.DirAndName()
+	}
+	eventNotification := &filer_pb.EventNotification{
+		OldEntry:      oldEntry.ToProtoEntry(),
+		NewEntry:      newEntry.ToProtoEntry(),
+		DeleteChunks:  deleteChunks,
+		NewParentPath: newParentPath,
+	}
+
 	if notification.Queue != nil {
-
 		glog.V(3).Infof("notifying entry update %v", key)
+		notification.Queue.SendMessage(key, eventNotification)
+	}
 
-		newParentPath := ""
+	f.logMetaEvent(time.Now(), key, eventNotification)
-		if newEntry != nil {
-			newParentPath, _ = newEntry.FullPath.DirAndName()
-		}
 
-		notification.Queue.SendMessage(
+}
-			key,
-			&filer_pb.EventNotification{
-				OldEntry:      oldEntry.ToProtoEntry(),
-				NewEntry:      newEntry.ToProtoEntry(),
-				DeleteChunks:  deleteChunks,
-				NewParentPath: newParentPath,
-			},
-		)
 
+func (f *Filer) logMetaEvent(ts time.Time, dir string, eventNotification *filer_pb.EventNotification) {
+	event := &filer_pb.FullEventNotification{
+		Directory:         dir,
+		EventNotification: eventNotification,
+	}
+	data, err := proto.Marshal(event)
+	if err != nil {
+		glog.Errorf("failed to marshal filer_pb.FullEventNotification %+v: %v", event, err)
+		return
+	}
+
+	f.metaLogBuffer.AddToBuffer(ts, []byte(dir), data)
+
+}
+
+func (f *Filer) logFlushFunc(startTime, stopTime time.Time, buf []byte) {
+	targetFile := fmt.Sprintf("/.meta/log/%04d/%02d/%02d/%02d/%02d/%02d-%02d.log",
+		startTime.Year(), startTime.Month(), startTime.Day(), startTime.Hour(), startTime.Minute(),
+		startTime.Second(), stopTime.Second())
+
+	if err := f.appendToFile(targetFile, buf); err != nil {
+		glog.V(0).Infof("log write failed %s: %v", targetFile, err)
 	}
 }
+
+type LogBuffer struct {
+	buf           []byte
+	pos           int
+	startTime     time.Time
+	stopTime      time.Time
+	sizeBuf       []byte
+	flushInterval time.Duration
+	flushFn       func(startTime, stopTime time.Time, buf []byte)
+	sync.Mutex
+}
+
+func NewLogBuffer(flushInterval time.Duration, flushFn func(startTime, stopTime time.Time, buf []byte)) *LogBuffer {
+	lb := &LogBuffer{
+		buf:           make([]byte, 4*0124*1024),
+		sizeBuf:       make([]byte, 4),
+		flushInterval: 2 * time.Second, // flushInterval,
+		flushFn:       flushFn,
+	}
+	go lb.loopFlush()
+	return lb
+}
+
+func (m *LogBuffer) loopFlush() {
+	for {
+		m.Lock()
+		m.flush()
+		m.Unlock()
+		time.Sleep(m.flushInterval)
+	}
+}
+
+func (m *LogBuffer) flush() {
+	if m.flushFn != nil && m.pos > 0 {
+		m.flushFn(m.startTime, m.stopTime, m.buf[:m.pos])
+		m.pos = 0
+	}
+}
+
+func (m *LogBuffer) AddToBuffer(ts time.Time, key, data []byte) {
+
+	logEntry := &filer_pb.LogEntry{
+		TsNs:             ts.UnixNano(),
+		PartitionKeyHash: util.HashToInt32(key),
+		Data:             data,
+	}
+
+	logEntryData, _ := proto.Marshal(logEntry)
+
+	size := len(logEntryData)
+
+	m.Lock()
+	defer m.Unlock()
+
+	if m.pos == 0 {
+		m.startTime = ts
+	}
+
+	if m.startTime.Add(m.flushInterval).Before(ts) || len(m.buf)-m.pos < size+4 {
+		m.flush()
+		m.startTime = ts
+	}
+	m.stopTime = ts
+
+	util.Uint32toBytes(m.sizeBuf, uint32(size))
+	copy(m.buf[m.pos:m.pos+4], m.sizeBuf)
+
+	copy(m.buf[m.pos+4:m.pos+4+size], logEntryData)
+	m.pos += size + 4
+}

weed/filer2/filer_notify_append.go

@@ -0,0 +1,70 @@
+package filer2
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+func (f *Filer) appendToFile(targetFile string, data []byte) error {
+
+	// assign a volume location
+	assignRequest := &operation.VolumeAssignRequest{
+		Count: 1,
+	}
+	assignResult, err := operation.Assign(f.GetMaster(), f.GrpcDialOption, assignRequest)
+	if err != nil {
+		return fmt.Errorf("AssignVolume: %v", err)
+	}
+	if assignResult.Error != "" {
+		return fmt.Errorf("AssignVolume error: %v", assignResult.Error)
+	}
+
+	// upload data
+	targetUrl := "http://" + assignResult.Url + "/" + assignResult.Fid
+	uploadResult, err := operation.UploadData(targetUrl, "", false, data, false, "", nil, assignResult.Auth)
+	if err != nil {
+		return fmt.Errorf("upload data %s: %v", targetUrl, err)
+	}
+	println("uploaded to", targetUrl)
+
+	// find out existing entry
+	fullpath := util.FullPath(targetFile)
+	entry, err := f.FindEntry(context.Background(), fullpath)
+	var offset int64 = 0
+	if err == filer_pb.ErrNotFound {
+		entry = &Entry{
+			FullPath: fullpath,
+			Attr: Attr{
+				Crtime: time.Now(),
+				Mtime:  time.Now(),
+				Mode:   os.FileMode(0644),
+				Uid:    OS_UID,
+				Gid:    OS_GID,
+			},
+		}
+	} else {
+		offset = int64(TotalSize(entry.Chunks))
+	}
+
+	// append to existing chunks
+	chunk := &filer_pb.FileChunk{
+		FileId:    assignResult.Fid,
+		Offset:    offset,
+		Size:      uint64(uploadResult.Size),
+		Mtime:     time.Now().UnixNano(),
+		ETag:      uploadResult.ETag,
+		IsGzipped: uploadResult.Gzip > 0,
+	}
+	entry.Chunks = append(entry.Chunks, chunk)
+
+	// update the entry
+	err = f.CreateEntry(context.Background(), entry, false)
+
+	return err
+}

weed/pb/filer.proto

@@ -42,6 +42,9 @@ service SeaweedFiler {
     rpc GetFilerConfiguration (GetFilerConfigurationRequest) returns (GetFilerConfigurationResponse) {
     }
 
+    rpc ListenForEvents (ListenForEventsRequest) returns (stream FullEventNotification) {
+    }
+
 }
 
 //////////////////////////////////////////////////
@@ -230,3 +233,19 @@ message GetFilerConfigurationResponse {
     string dir_queues = 6;
     bool cipher = 7;
 }
+
+message ListenForEventsRequest {
+    string client_name = 1;
+    string directory = 2;
+    int64 since_sec = 3;
+}
+message FullEventNotification {
+    string directory = 1;
+    EventNotification event_notification = 2;
+}
+
+message LogEntry {
+    int64 ts_ns = 1;
+    int32 partition_key_hash = 2;
+    bytes data = 3;
+}

weed/pb/filer_pb/filer.pb.go

@@ -39,6 +39,9 @@ It has these top-level messages:
 	StatisticsResponse
 	GetFilerConfigurationRequest
 	GetFilerConfigurationResponse
+	ListenForEventsRequest
+	FullEventNotification
+	LogEntry
 */
 package filer_pb
 
@@ -1087,6 +1090,94 @@ func (m *GetFilerConfigurationResponse) GetCipher() bool {
 	return false
 }
 
+type ListenForEventsRequest struct {
+	ClientName string `protobuf:"bytes,1,opt,name=client_name,json=clientName" json:"client_name,omitempty"`
+	Directory  string `protobuf:"bytes,2,opt,name=directory" json:"directory,omitempty"`
+	SinceSec   int64  `protobuf:"varint,3,opt,name=since_sec,json=sinceSec" json:"since_sec,omitempty"`
+}
+
+func (m *ListenForEventsRequest) Reset()                    { *m = ListenForEventsRequest{} }
+func (m *ListenForEventsRequest) String() string            { return proto.CompactTextString(m) }
+func (*ListenForEventsRequest) ProtoMessage()               {}
+func (*ListenForEventsRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{30} }
+
+func (m *ListenForEventsRequest) GetClientName() string {
+	if m != nil {
+		return m.ClientName
+	}
+	return ""
+}
+
+func (m *ListenForEventsRequest) GetDirectory() string {
+	if m != nil {
+		return m.Directory
+	}
+	return ""
+}
+
+func (m *ListenForEventsRequest) GetSinceSec() int64 {
+	if m != nil {
+		return m.SinceSec
+	}
+	return 0
+}
+
+type FullEventNotification struct {
+	Directory         string             `protobuf:"bytes,1,opt,name=directory" json:"directory,omitempty"`
+	EventNotification *EventNotification `protobuf:"bytes,2,opt,name=event_notification,json=eventNotification" json:"event_notification,omitempty"`
+}
+
+func (m *FullEventNotification) Reset()                    { *m = FullEventNotification{} }
+func (m *FullEventNotification) String() string            { return proto.CompactTextString(m) }
+func (*FullEventNotification) ProtoMessage()               {}
+func (*FullEventNotification) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{31} }
+
+func (m *FullEventNotification) GetDirectory() string {
+	if m != nil {
+		return m.Directory
+	}
+	return ""
+}
+
+func (m *FullEventNotification) GetEventNotification() *EventNotification {
+	if m != nil {
+		return m.EventNotification
+	}
+	return nil
+}
+
+type LogEntry struct {
+	TsNs             int64  `protobuf:"varint,1,opt,name=ts_ns,json=tsNs" json:"ts_ns,omitempty"`
+	PartitionKeyHash int32  `protobuf:"varint,2,opt,name=partition_key_hash,json=partitionKeyHash" json:"partition_key_hash,omitempty"`
+	Data             []byte `protobuf:"bytes,3,opt,name=data,proto3" json:"data,omitempty"`
+}
+
+func (m *LogEntry) Reset()                    { *m = LogEntry{} }
+func (m *LogEntry) String() string            { return proto.CompactTextString(m) }
+func (*LogEntry) ProtoMessage()               {}
+func (*LogEntry) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{32} }
+
+func (m *LogEntry) GetTsNs() int64 {
+	if m != nil {
+		return m.TsNs
+	}
+	return 0
+}
+
+func (m *LogEntry) GetPartitionKeyHash() int32 {
+	if m != nil {
+		return m.PartitionKeyHash
+	}
+	return 0
+}
+
+func (m *LogEntry) GetData() []byte {
+	if m != nil {
+		return m.Data
+	}
+	return nil
+}
+
 func init() {
 	proto.RegisterType((*LookupDirectoryEntryRequest)(nil), "filer_pb.LookupDirectoryEntryRequest")
 	proto.RegisterType((*LookupDirectoryEntryResponse)(nil), "filer_pb.LookupDirectoryEntryResponse")
@@ -1118,6 +1209,9 @@ func init() {
 	proto.RegisterType((*StatisticsResponse)(nil), "filer_pb.StatisticsResponse")
 	proto.RegisterType((*GetFilerConfigurationRequest)(nil), "filer_pb.GetFilerConfigurationRequest")
 	proto.RegisterType((*GetFilerConfigurationResponse)(nil), "filer_pb.GetFilerConfigurationResponse")
+	proto.RegisterType((*ListenForEventsRequest)(nil), "filer_pb.ListenForEventsRequest")
+	proto.RegisterType((*FullEventNotification)(nil), "filer_pb.FullEventNotification")
+	proto.RegisterType((*LogEntry)(nil), "filer_pb.LogEntry")
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -1142,6 +1236,7 @@ type SeaweedFilerClient interface {
 	DeleteCollection(ctx context.Context, in *DeleteCollectionRequest, opts ...grpc.CallOption) (*DeleteCollectionResponse, error)
 	Statistics(ctx context.Context, in *StatisticsRequest, opts ...grpc.CallOption) (*StatisticsResponse, error)
 	GetFilerConfiguration(ctx context.Context, in *GetFilerConfigurationRequest, opts ...grpc.CallOption) (*GetFilerConfigurationResponse, error)
+	ListenForEvents(ctx context.Context, in *ListenForEventsRequest, opts ...grpc.CallOption) (SeaweedFiler_ListenForEventsClient, error)
 }
 
 type seaweedFilerClient struct {
@@ -1274,6 +1369,38 @@ func (c *seaweedFilerClient) GetFilerConfiguration(ctx context.Context, in *GetF
 	return out, nil
 }
 
+func (c *seaweedFilerClient) ListenForEvents(ctx context.Context, in *ListenForEventsRequest, opts ...grpc.CallOption) (SeaweedFiler_ListenForEventsClient, error) {
+	stream, err := grpc.NewClientStream(ctx, &_SeaweedFiler_serviceDesc.Streams[1], c.cc, "/filer_pb.SeaweedFiler/ListenForEvents", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &seaweedFilerListenForEventsClient{stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+type SeaweedFiler_ListenForEventsClient interface {
+	Recv() (*FullEventNotification, error)
+	grpc.ClientStream
+}
+
+type seaweedFilerListenForEventsClient struct {
+	grpc.ClientStream
+}
+
+func (x *seaweedFilerListenForEventsClient) Recv() (*FullEventNotification, error) {
+	m := new(FullEventNotification)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
 // Server API for SeaweedFiler service
 
 type SeaweedFilerServer interface {
@@ -1288,6 +1415,7 @@ type SeaweedFilerServer interface {
 	DeleteCollection(context.Context, *DeleteCollectionRequest) (*DeleteCollectionResponse, error)
 	Statistics(context.Context, *StatisticsRequest) (*StatisticsResponse, error)
 	GetFilerConfiguration(context.Context, *GetFilerConfigurationRequest) (*GetFilerConfigurationResponse, error)
+	ListenForEvents(*ListenForEventsRequest, SeaweedFiler_ListenForEventsServer) error
 }
 
 func RegisterSeaweedFilerServer(s *grpc.Server, srv SeaweedFilerServer) {
@@ -1495,6 +1623,27 @@ func _SeaweedFiler_GetFilerConfiguration_Handler(srv interface{}, ctx context.Co
 	return interceptor(ctx, in, info, handler)
 }
 
+func _SeaweedFiler_ListenForEvents_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(ListenForEventsRequest)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
+	}
+	return srv.(SeaweedFilerServer).ListenForEvents(m, &seaweedFilerListenForEventsServer{stream})
+}
+
+type SeaweedFiler_ListenForEventsServer interface {
+	Send(*FullEventNotification) error
+	grpc.ServerStream
+}
+
+type seaweedFilerListenForEventsServer struct {
+	grpc.ServerStream
+}
+
+func (x *seaweedFilerListenForEventsServer) Send(m *FullEventNotification) error {
+	return x.ServerStream.SendMsg(m)
+}
+
 var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "filer_pb.SeaweedFiler",
 	HandlerType: (*SeaweedFilerServer)(nil),
@@ -1546,6 +1695,11 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 			Handler:       _SeaweedFiler_ListEntries_Handler,
 			ServerStreams: true,
 		},
+		{
+			StreamName:    "ListenForEvents",
+			Handler:       _SeaweedFiler_ListenForEvents_Handler,
+			ServerStreams: true,
+		},
 	},
 	Metadata: "filer.proto",
 }
@@ -1553,114 +1707,124 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 1739 bytes of a gzipped FileDescriptorProto
+	// 1901 bytes of a gzipped FileDescriptorProto
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+	0xef, 0xfa, 0x0a, 0xee, 0xcc, 0xc1, 0x24, 0xd9, 0xaa, 0x56, 0x4d, 0x1d, 0x41, 0xc7, 0x0f, 0xcc,
+	0x7f, 0x4f, 0x0b, 0xc0, 0x4e, 0x55, 0xd6, 0x8b, 0xfb, 0xb0, 0x2c, 0x34, 0x44, 0x1c, 0x8b, 0x6d,
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+	0x1f, 0x00, 0x00, 0xff, 0xff, 0xbe, 0x11, 0xf3, 0xf2, 0xf9, 0x14, 0x00, 0x00,
 }

weed/pb/master_pb/master.pb.go

@@ -428,12 +428,10 @@ type VolumeEcShardInformationMessage struct {
 	EcIndexBits uint32 `protobuf:"varint,3,opt,name=ec_index_bits,json=ecIndexBits" json:"ec_index_bits,omitempty"`
 }
 
-func (m *VolumeEcShardInformationMessage) Reset()         { *m = VolumeEcShardInformationMessage{} }
+func (m *VolumeEcShardInformationMessage) Reset()                    { *m = VolumeEcShardInformationMessage{} }
-func (m *VolumeEcShardInformationMessage) String() string { return proto.CompactTextString(m) }
+func (m *VolumeEcShardInformationMessage) String() string            { return proto.CompactTextString(m) }
-func (*VolumeEcShardInformationMessage) ProtoMessage()    {}
+func (*VolumeEcShardInformationMessage) ProtoMessage()               {}
-func (*VolumeEcShardInformationMessage) Descriptor() ([]byte, []int) {
+func (*VolumeEcShardInformationMessage) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{4} }
-	return fileDescriptor0, []int{4}
-}
 
 func (m *VolumeEcShardInformationMessage) GetId() uint32 {
 	if m != nil {
@@ -1424,12 +1422,10 @@ type GetMasterConfigurationResponse struct {
 	MetricsIntervalSeconds uint32 `protobuf:"varint,2,opt,name=metrics_interval_seconds,json=metricsIntervalSeconds" json:"metrics_interval_seconds,omitempty"`
 }
 
-func (m *GetMasterConfigurationResponse) Reset()         { *m = GetMasterConfigurationResponse{} }
+func (m *GetMasterConfigurationResponse) Reset()                    { *m = GetMasterConfigurationResponse{} }
-func (m *GetMasterConfigurationResponse) String() string { return proto.CompactTextString(m) }
+func (m *GetMasterConfigurationResponse) String() string            { return proto.CompactTextString(m) }
-func (*GetMasterConfigurationResponse) ProtoMessage()    {}
+func (*GetMasterConfigurationResponse) ProtoMessage()               {}
-func (*GetMasterConfigurationResponse) Descriptor() ([]byte, []int) {
+func (*GetMasterConfigurationResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{32} }
-	return fileDescriptor0, []int{32}
-}
 
 func (m *GetMasterConfigurationResponse) GetMetricsAddress() string {
 	if m != nil {

weed/pb/volume_server.proto

@@ -94,6 +94,7 @@ service VolumeServer {
 
 message BatchDeleteRequest {
     repeated string file_ids = 1;
+    bool skip_cookie_check = 2;
 }
 
 message BatchDeleteResponse {

weed/pb/volume_server_pb/volume_server.pb.go

@@ -1051,12 +1051,10 @@ func (m *VolumeEcShardsGenerateRequest) GetCollection() string {
 type VolumeEcShardsGenerateResponse struct {
 }
 
-func (m *VolumeEcShardsGenerateResponse) Reset()         { *m = VolumeEcShardsGenerateResponse{} }
+func (m *VolumeEcShardsGenerateResponse) Reset()                    { *m = VolumeEcShardsGenerateResponse{} }
-func (m *VolumeEcShardsGenerateResponse) String() string { return proto.CompactTextString(m) }
+func (m *VolumeEcShardsGenerateResponse) String() string            { return proto.CompactTextString(m) }
-func (*VolumeEcShardsGenerateResponse) ProtoMessage()    {}
+func (*VolumeEcShardsGenerateResponse) ProtoMessage()               {}
-func (*VolumeEcShardsGenerateResponse) Descriptor() ([]byte, []int) {
+func (*VolumeEcShardsGenerateResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{41} }
-	return fileDescriptor0, []int{41}
-}
 
 type VolumeEcShardsRebuildRequest struct {
 	VolumeId   uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
@@ -1429,12 +1427,10 @@ func (m *VolumeEcShardsToVolumeRequest) GetCollection() string {
 type VolumeEcShardsToVolumeResponse struct {
 }
 
-func (m *VolumeEcShardsToVolumeResponse) Reset()         { *m = VolumeEcShardsToVolumeResponse{} }
+func (m *VolumeEcShardsToVolumeResponse) Reset()                    { *m = VolumeEcShardsToVolumeResponse{} }
-func (m *VolumeEcShardsToVolumeResponse) String() string { return proto.CompactTextString(m) }
+func (m *VolumeEcShardsToVolumeResponse) String() string            { return proto.CompactTextString(m) }
-func (*VolumeEcShardsToVolumeResponse) ProtoMessage()    {}
+func (*VolumeEcShardsToVolumeResponse) ProtoMessage()               {}
-func (*VolumeEcShardsToVolumeResponse) Descriptor() ([]byte, []int) {
+func (*VolumeEcShardsToVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{57} }
-	return fileDescriptor0, []int{57}
-}
 
 type ReadVolumeFileStatusRequest struct {
 	VolumeId uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
@@ -2101,10 +2097,8 @@ type QueryRequest_InputSerialization_JSONInput struct {
 func (m *QueryRequest_InputSerialization_JSONInput) Reset() {
 	*m = QueryRequest_InputSerialization_JSONInput{}
 }
-func (m *QueryRequest_InputSerialization_JSONInput) String() string {
+func (m *QueryRequest_InputSerialization_JSONInput) String() string { return proto.CompactTextString(m) }
-	return proto.CompactTextString(m)
+func (*QueryRequest_InputSerialization_JSONInput) ProtoMessage()    {}
-}
-func (*QueryRequest_InputSerialization_JSONInput) ProtoMessage() {}
 func (*QueryRequest_InputSerialization_JSONInput) Descriptor() ([]byte, []int) {
 	return fileDescriptor0, []int{70, 1, 1}
 }

weed/server/filer_grpc_server_listen.go

@@ -0,0 +1,70 @@
+package weed_server
+
+import (
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+)
+
+func (fs *FilerServer) ListenForEvents(req *filer_pb.ListenForEventsRequest, stream filer_pb.SeaweedFiler_ListenForEventsServer) error {
+
+	peerAddress := findClientAddress(stream.Context(), 0)
+
+	clientName, messageChan := fs.addClient(req.ClientName, peerAddress)
+
+	defer fs.deleteClient(clientName, messageChan)
+
+	// ts := time.Unix(req.SinceSec, 0)
+
+	// iterate through old messages
+	/*
+		for _, message := range ms.Topo.ToVolumeLocations() {
+			if err := stream.Send(message); err != nil {
+				return err
+			}
+		}
+	*/
+
+	// need to add a buffer here to avoid slow clients
+	// also needs to support millions of clients
+
+	for message := range messageChan {
+		if err := stream.Send(message); err != nil {
+			glog.V(0).Infof("=> client %v: %+v", clientName, message)
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (fs *FilerServer) addClient(clientType string, clientAddress string) (clientName string, messageChan chan *filer_pb.FullEventNotification) {
+	clientName = clientType + "@" + clientAddress
+	glog.V(0).Infof("+ listener %v", clientName)
+
+	messageChan = make(chan *filer_pb.FullEventNotification, 10)
+
+	fs.clientChansLock.Lock()
+	fs.clientChans[clientName] = messageChan
+	fs.clientChansLock.Unlock()
+	return
+}
+
+func (fs *FilerServer) deleteClient(clientName string, messageChan chan *filer_pb.FullEventNotification) {
+	glog.V(0).Infof("- listener %v", clientName)
+	close(messageChan)
+	fs.clientChansLock.Lock()
+	delete(fs.clientChans, clientName)
+	fs.clientChansLock.Unlock()
+}
+
+func (fs *FilerServer) sendMessageToClients(dir string, eventNotification *filer_pb.EventNotification) {
+	message := &filer_pb.FullEventNotification{
+		Directory:         dir,
+		EventNotification: eventNotification,
+	}
+	fs.clientChansLock.RLock()
+	for _, ch := range fs.clientChans {
+		ch <- message
+	}
+	fs.clientChansLock.RUnlock()
+}

weed/server/filer_server.go

@@ -5,11 +5,13 @@ import (
 	"fmt"
 	"net/http"
 	"os"
+	"sync"
 	"time"
 
 	"google.golang.org/grpc"
 
 	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/util"
@@ -52,6 +54,11 @@ type FilerServer struct {
 	secret         security.SigningKey
 	filer          *filer2.Filer
 	grpcDialOption grpc.DialOption
+
+	// notifying clients
+	clientChansLock sync.RWMutex
+	clientChans     map[string]chan *filer_pb.FullEventNotification
+
 }
 
 func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption) (fs *FilerServer, err error) {

weed/util/bytes.go

@@ -74,3 +74,20 @@ func HashStringToLong(dir string) (v int64) {
 
 	return
 }
+
+func HashToInt32(data []byte) (v int32) {
+	h := md5.New()
+	h.Write(data)
+
+	b := h.Sum(nil)
+
+	v += int32(b[0])
+	v <<= 8
+	v += int32(b[1])
+	v <<= 8
+	v += int32(b[2])
+	v <<= 8
+	v += int32(b[3])
+
+	return
+}