able to subscribe any topic from any point of time

weed/filer2/filer_notify.go

@@ -109,7 +109,7 @@ func (f *Filer) ReadPersistedLogBuffer(startTime time.Time, eachLogEntryFn func(
 			}
 			// println("processing", hourMinuteEntry.FullPath)
 			chunkedFileReader := NewChunkStreamReaderFromFiler(f.MasterClient, hourMinuteEntry.Chunks)
-			if err := readEachLogEntry(chunkedFileReader, sizeBuf, startTsNs, eachLogEntryFn); err != nil {
+			if err := ReadEachLogEntry(chunkedFileReader, sizeBuf, startTsNs, eachLogEntryFn); err != nil {
 				chunkedFileReader.Close()
 				if err == io.EOF {
 					break
@@ -123,7 +123,7 @@ func (f *Filer) ReadPersistedLogBuffer(startTime time.Time, eachLogEntryFn func(
 	return nil
 }
 
-func readEachLogEntry(r io.Reader, sizeBuf []byte, ns int64, eachLogEntryFn func(logEntry *filer_pb.LogEntry) error) error {
+func ReadEachLogEntry(r io.Reader, sizeBuf []byte, ns int64, eachLogEntryFn func(logEntry *filer_pb.LogEntry) error) error {
 	for {
 		n, err := r.Read(sizeBuf)
 		if err != nil {

weed/filer2/reader_at.go

@@ -27,34 +27,40 @@ type ChunkReadAt struct {
 
 // var _ = io.ReaderAt(&ChunkReadAt{})
 
+type LookupFileIdFunctionType func(fileId string) (targetUrl string, err error)
+
+func LookupFn(filerClient filer_pb.FilerClient) LookupFileIdFunctionType {
+	return func(fileId string) (targetUrl string, err error) {
+		err = filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+			vid := VolumeId(fileId)
+			resp, err := client.LookupVolume(context.Background(), &filer_pb.LookupVolumeRequest{
+				VolumeIds: []string{vid},
+			})
+			if err != nil {
+				return err
+			}
+
+			locations := resp.LocationsMap[vid]
+			if locations == nil || len(locations.Locations) == 0 {
+				glog.V(0).Infof("failed to locate %s", fileId)
+				return fmt.Errorf("failed to locate %s", fileId)
+			}
+
+			volumeServerAddress := filerClient.AdjustedUrl(locations.Locations[0].Url)
+
+			targetUrl = fmt.Sprintf("http://%s/%s", volumeServerAddress, fileId)
+
+			return nil
+		})
+		return
+	}
+}
+
 func NewChunkReaderAtFromClient(filerClient filer_pb.FilerClient, chunkViews []*ChunkView, chunkCache *chunk_cache.ChunkCache) *ChunkReadAt {
 
 	return &ChunkReadAt{
 		chunkViews: chunkViews,
-		lookupFileId: func(fileId string) (targetUrl string, err error) {
-			err = filerClient.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
-				vid := VolumeId(fileId)
-				resp, err := client.LookupVolume(context.Background(), &filer_pb.LookupVolumeRequest{
-					VolumeIds: []string{vid},
-				})
-				if err != nil {
-					return err
-				}
-
-				locations := resp.LocationsMap[vid]
-				if locations == nil || len(locations.Locations) == 0 {
-					glog.V(0).Infof("failed to locate %s", fileId)
-					return fmt.Errorf("failed to locate %s", fileId)
-				}
-
-				volumeServerAddress := filerClient.AdjustedUrl(locations.Locations[0].Url)
-
-				targetUrl = fmt.Sprintf("http://%s/%s", volumeServerAddress, fileId)
-
-				return nil
-			})
-			return
-		},
+		lookupFileId: LookupFn(filerClient),
 		bufferOffset: -1,
 		chunkCache:   chunkCache,
 	}

weed/filer2/stream.go

@@ -81,7 +81,7 @@ type ChunkStreamReader struct {
 	bufferOffset int64
 	bufferPos    int
 	chunkIndex   int
-	lookupFileId func(fileId string) (targetUrl string, err error)
+	lookupFileId LookupFileIdFunctionType
 }
 
 var _ = io.ReadSeeker(&ChunkStreamReader{})
@@ -98,6 +98,16 @@ func NewChunkStreamReaderFromFiler(masterClient *wdclient.MasterClient, chunks [
 	}
 }
 
+func NewChunkStreamReader(filerClient filer_pb.FilerClient, chunks []*filer_pb.FileChunk) *ChunkStreamReader {
+
+	chunkViews := ViewFromChunks(chunks, 0, math.MaxInt32)
+
+	return &ChunkStreamReader{
+		chunkViews: chunkViews,
+		lookupFileId: LookupFn(filerClient),
+	}
+}
+
 func (c *ChunkStreamReader) Read(p []byte) (n int, err error) {
 	for n < len(p) {
 		if c.isBufferEmpty() {

weed/filesys/dir.go

@@ -263,7 +263,7 @@ func (dir *Dir) ReadDirAll(ctx context.Context) (ret []fuse.Dirent, err error) {
 	glog.V(3).Infof("dir ReadDirAll %s", dir.FullPath())
 
 	cacheTtl := 5 * time.Minute
-	processEachEntryFn := func(entry *filer_pb.Entry, isLast bool) {
+	processEachEntryFn := func(entry *filer_pb.Entry, isLast bool) error {
 		fullpath := util.NewFullPath(dir.FullPath(), entry.Name)
 		inode := fullpath.AsInode()
 		if entry.IsDirectory {
@@ -274,6 +274,7 @@ func (dir *Dir) ReadDirAll(ctx context.Context) (ret []fuse.Dirent, err error) {
 			ret = append(ret, dirent)
 		}
 		dir.wfs.cacheSet(fullpath, entry, cacheTtl)
+		return nil
 	}
 
 	if dir.wfs.option.AsyncMetaDataCaching {

weed/messaging/broker/broker_grpc_server_subscribe.go

@@ -3,10 +3,12 @@ package broker
 import (
 	"fmt"
 	"io"
+	"strings"
 	"time"
 
 	"github.com/golang/protobuf/proto"
 
+	"github.com/chrislusf/seaweedfs/weed/filer2"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/messaging_pb"
@@ -57,6 +59,7 @@ func (broker *MessageBroker) Subscribe(stream messaging_pb.SeaweedMessaging_Subs
 	case messaging_pb.SubscriberMessage_InitMessage_LATEST:
 	case messaging_pb.SubscriberMessage_InitMessage_EARLIEST:
 	}
+	var processedTsNs int64
 
 	// how to process each message
 	// an error returned will end the subscription
@@ -81,9 +84,18 @@ func (broker *MessageBroker) Subscribe(stream messaging_pb.SeaweedMessaging_Subs
 			glog.Errorf("sending %d bytes to %s: %s", len(m.Value), subscriberId, err)
 			return err
 		}
+		processedTsNs = logEntry.TsNs
 		return nil
 	}
 
+	if err := broker.readPersistedLogBuffer(&tp, lastReadTime, eachLogEntryFn); err != nil {
+		return err
+	}
+
+	if processedTsNs != 0 {
+		lastReadTime = time.Unix(0, processedTsNs)
+	}
+
 	messageCount, err = lock.logBuffer.LoopProcessLogData(lastReadTime, func() bool {
 		lock.Mutex.Lock()
 		lock.cond.Wait()
@@ -94,3 +106,36 @@ func (broker *MessageBroker) Subscribe(stream messaging_pb.SeaweedMessaging_Subs
 	return err
 
 }
+
+func (broker *MessageBroker) readPersistedLogBuffer(tp *TopicPartition, startTime time.Time, eachLogEntryFn func(logEntry *filer_pb.LogEntry) error) (err error) {
+	startDate := fmt.Sprintf("%04d-%02d-%02d", startTime.Year(), startTime.Month(), startTime.Day())
+	startHourMinute := fmt.Sprintf("%02d-%02d.segment", startTime.Hour(), startTime.Minute())
+
+	sizeBuf := make([]byte, 4)
+	startTsNs := startTime.UnixNano()
+
+	topicDir := fmt.Sprintf("/topics/%s/%s", tp.Namespace, tp.Topic)
+
+	return filer_pb.List(broker, topicDir, "", func(dayEntry *filer_pb.Entry, isLast bool) error {
+		dayDir := fmt.Sprintf("%s/%s", topicDir, dayEntry.Name)
+		return filer_pb.List(broker, dayDir, "", func(hourMinuteEntry *filer_pb.Entry, isLast bool) error {
+			if dayEntry.Name == startDate {
+				if strings.Compare(hourMinuteEntry.Name, startHourMinute) < 0 {
+					return nil
+				}
+			}
+			// println("processing", hourMinuteEntry.FullPath)
+			chunkedFileReader := filer2.NewChunkStreamReader(broker, hourMinuteEntry.Chunks)
+			defer chunkedFileReader.Close()
+			if err := filer2.ReadEachLogEntry(chunkedFileReader, sizeBuf, startTsNs, eachLogEntryFn); err != nil {
+				chunkedFileReader.Close()
+				if err == io.EOF {
+					return nil
+				}
+				return fmt.Errorf("reading %s/%s: %v", dayDir, hourMinuteEntry.Name, err)
+			}
+			return nil
+		}, "", false, 24*60)
+	}, startDate, true, 366)
+
+}

weed/pb/filer_pb/filer_client.go

@@ -56,19 +56,21 @@ func GetEntry(filerClient FilerClient, fullFilePath util.FullPath) (entry *Entry
 	return
 }
 
-func ReadDirAllEntries(filerClient FilerClient, fullDirPath util.FullPath, prefix string, fn func(entry *Entry, isLast bool)) (err error) {
+type EachEntryFunciton func(entry *Entry, isLast bool) error
+
+func ReadDirAllEntries(filerClient FilerClient, fullDirPath util.FullPath, prefix string, fn EachEntryFunciton) (err error) {
 
 	return doList(filerClient, fullDirPath, prefix, fn, "", false, math.MaxUint32)
 
 }
 
-func List(filerClient FilerClient, parentDirectoryPath, prefix string, fn func(entry *Entry, isLast bool), startFrom string, inclusive bool, limit uint32) (err error) {
+func List(filerClient FilerClient, parentDirectoryPath, prefix string, fn EachEntryFunciton, startFrom string, inclusive bool, limit uint32) (err error) {
 
 	return doList(filerClient, util.FullPath(parentDirectoryPath), prefix, fn, startFrom, inclusive, limit)
 
 }
 
-func doList(filerClient FilerClient, fullDirPath util.FullPath, prefix string, fn func(entry *Entry, isLast bool), startFrom string, inclusive bool, limit uint32) (err error) {
+func doList(filerClient FilerClient, fullDirPath util.FullPath, prefix string, fn EachEntryFunciton, startFrom string, inclusive bool, limit uint32) (err error) {
 
 	err = filerClient.WithFilerClient(func(client SeaweedFilerClient) error {
 
@@ -92,7 +94,9 @@ func doList(filerClient FilerClient, fullDirPath util.FullPath, prefix string, f
 			if recvErr != nil {
 				if recvErr == io.EOF {
 					if prevEntry != nil {
-						fn(prevEntry, true)
+						if err := fn(prevEntry, true); err != nil {
+							return err
+						}
 					}
 					break
 				} else {
@@ -100,7 +104,9 @@ func doList(filerClient FilerClient, fullDirPath util.FullPath, prefix string, f
 				}
 			}
 			if prevEntry != nil {
-				fn(prevEntry, false)
+				if err := fn(prevEntry, false); err != nil {
+					return err
+				}
 			}
 			prevEntry = resp.Entry
 		}

weed/pb/filer_pb/filer_client_bfs.go

@@ -45,7 +45,7 @@ func TraverseBfs(filerClient FilerClient, parentPath util.FullPath, fn func(pare
 
 func processOneDirectory(filerClient FilerClient, parentPath util.FullPath, queue *util.Queue, jobQueueWg *sync.WaitGroup, fn func(parentPath util.FullPath, entry *Entry)) (err error) {
 
-	return ReadDirAllEntries(filerClient, parentPath, "", func(entry *Entry, isLast bool) {
+	return ReadDirAllEntries(filerClient, parentPath, "", func(entry *Entry, isLast bool) error {
 
 		fn(parentPath, entry)
 
@@ -57,6 +57,7 @@ func processOneDirectory(filerClient FilerClient, parentPath util.FullPath, queu
 			jobQueueWg.Add(1)
 			queue.Enqueue(util.FullPath(subDir))
 		}
+		return nil
 	})
 
 }

weed/s3api/filer_util.go

@@ -23,8 +23,9 @@ func (s3a *S3ApiServer) mkFile(parentDirectoryPath string, fileName string, chun
 
 func (s3a *S3ApiServer) list(parentDirectoryPath, prefix, startFrom string, inclusive bool, limit uint32) (entries []*filer_pb.Entry, err error) {
 
-	err = filer_pb.List(s3a, parentDirectoryPath, prefix, func(entry *filer_pb.Entry, isLast bool) {
+	err = filer_pb.List(s3a, parentDirectoryPath, prefix, func(entry *filer_pb.Entry, isLast bool) error {
 		entries = append(entries, entry)
+		return nil
 	}, startFrom, inclusive, limit)
 
 	return

weed/server/webdav_server.go

@@ -511,7 +511,7 @@ func (f *WebDavFile) Readdir(count int) (ret []os.FileInfo, err error) {
 
 	dir, _ := util.FullPath(f.name).DirAndName()
 
-	err = filer_pb.ReadDirAllEntries(f.fs, util.FullPath(dir), "", func(entry *filer_pb.Entry, isLast bool) {
+	err = filer_pb.ReadDirAllEntries(f.fs, util.FullPath(dir), "", func(entry *filer_pb.Entry, isLast bool) error {
 		fi := FileInfo{
 			size:          int64(filer2.TotalSize(entry.GetChunks())),
 			name:          entry.Name,
@@ -525,6 +525,7 @@ func (f *WebDavFile) Readdir(count int) (ret []os.FileInfo, err error) {
 		}
 		glog.V(4).Infof("entry: %v", fi.name)
 		ret = append(ret, &fi)
+		return nil
 	})
 
 	old := f.off

weed/shell/command_bucket_list.go

@@ -45,12 +45,13 @@ func (c *commandBucketList) Do(args []string, commandEnv *CommandEnv, writer io.
 		return fmt.Errorf("read buckets: %v", err)
 	}
 
-	err = filer_pb.List(commandEnv, filerBucketsPath, "", func(entry *filer_pb.Entry, isLast bool) {
+	err = filer_pb.List(commandEnv, filerBucketsPath, "", func(entry *filer_pb.Entry, isLast bool) error {
 		if entry.Attributes.Replication == "" || entry.Attributes.Replication == "000" {
 			fmt.Fprintf(writer, "  %s\n", entry.Name)
 		} else {
 			fmt.Fprintf(writer, "  %s\t\t\treplication: %s\n", entry.Name, entry.Attributes.Replication)
 		}
+		return nil
 	}, "", false, math.MaxUint32)
 	if err != nil {
 		return fmt.Errorf("list buckets under %v: %v", filerBucketsPath, err)

weed/shell/command_fs_du.go

@@ -54,7 +54,7 @@ func (c *commandFsDu) Do(args []string, commandEnv *CommandEnv, writer io.Writer
 
 func duTraverseDirectory(writer io.Writer, filerClient filer_pb.FilerClient, dir, name string) (blockCount, byteCount uint64, err error) {
 
-	err = filer_pb.ReadDirAllEntries(filerClient, util.FullPath(dir), name, func(entry *filer_pb.Entry, isLast bool) {
+	err = filer_pb.ReadDirAllEntries(filerClient, util.FullPath(dir), name, func(entry *filer_pb.Entry, isLast bool) error {
 
 		var fileBlockCount, fileByteCount uint64
 
@@ -78,6 +78,7 @@ func duTraverseDirectory(writer io.Writer, filerClient filer_pb.FilerClient, dir
 		if name != "" && !entry.IsDirectory {
 			fmt.Fprintf(writer, "block:%4d\tbyte:%10d\t%s/%s\n", fileBlockCount, fileByteCount, dir, entry.Name)
 		}
+		return nil
 	})
 	return
 }

weed/shell/command_fs_ls.go

@@ -62,10 +62,10 @@ func (c *commandFsLs) Do(args []string, commandEnv *CommandEnv, writer io.Writer
 	dir, name := util.FullPath(path).DirAndName()
 	entryCount := 0
 
-	err = filer_pb.ReadDirAllEntries(commandEnv, util.FullPath(dir), name, func(entry *filer_pb.Entry, isLast bool) {
+	err = filer_pb.ReadDirAllEntries(commandEnv, util.FullPath(dir), name, func(entry *filer_pb.Entry, isLast bool) error {
 
 		if !showHidden && strings.HasPrefix(entry.Name, ".") {
-			return
+			return nil
 		}
 
 		entryCount++
@@ -100,6 +100,7 @@ func (c *commandFsLs) Do(args []string, commandEnv *CommandEnv, writer io.Writer
 			fmt.Fprintf(writer, "%s\n", entry.Name)
 		}
 
+		return nil
 	})
 
 	if isLongFormat && err == nil {

weed/shell/command_fs_tree.go

@@ -51,10 +51,10 @@ func treeTraverseDirectory(writer io.Writer, filerClient filer_pb.FilerClient, d
 
 	prefix.addMarker(level)
 
-	err = filer_pb.ReadDirAllEntries(filerClient, dir, name, func(entry *filer_pb.Entry, isLast bool) {
+	err = filer_pb.ReadDirAllEntries(filerClient, dir, name, func(entry *filer_pb.Entry, isLast bool) error {
 		if level < 0 && name != "" {
 			if entry.Name != name {
-				return
+				return nil
 			}
 		}
 
@@ -70,7 +70,7 @@ func treeTraverseDirectory(writer io.Writer, filerClient filer_pb.FilerClient, d
 		} else {
 			fileCount++
 		}
-
+		return nil
 	})
 	return
 }