4 files changed, 83 insertions, 98 deletions
diff --git a/weed/operation/chunked_file.go b/weed/operation/chunked_file.go
index 995f06b53..295204dd8 100644
--- a/weed/operation/chunked_file.go
+++ b/weed/operation/chunked_file.go
@@ -4,12 +4,13 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"google.golang.org/grpc"
 	"io"
 	"io/ioutil"
 	"net/http"
 	"sort"
 
+	"google.golang.org/grpc"
+
 	"sync"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -55,7 +56,7 @@ func (s ChunkList) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
 func LoadChunkManifest(buffer []byte, isGzipped bool) (*ChunkManifest, error) {
 	if isGzipped {
 		var err error
-		if buffer, err = UnGzipData(buffer); err != nil {
+		if buffer, err = util.UnGzipData(buffer); err != nil {
 			return nil, err
 		}
 	}
diff --git a/weed/operation/compress.go b/weed/operation/compress.go
deleted file mode 100644
index 7190eeeb2..000000000
--- a/weed/operation/compress.go
+++ /dev/null
@@ -1,95 +0,0 @@
-package operation
-
-import (
-	"bytes"
-	"compress/flate"
-	"compress/gzip"
-	"io/ioutil"
-	"strings"
-
-	"github.com/chrislusf/seaweedfs/weed/glog"
-	"golang.org/x/tools/godoc/util"
-)
-
-/*
-* Default more not to gzip since gzip can be done on client side.
- */
-func IsGzippable(ext, mtype string, data []byte) bool {
-
-	shouldBeZipped, iAmSure := IsGzippableFileType(ext, mtype)
-	if iAmSure {
-		return shouldBeZipped
-	}
-
-	isMostlyText := util.IsText(data)
-
-	return isMostlyText
-}
-
-/*
-* Default more not to gzip since gzip can be done on client side.
- */
-func IsGzippableFileType(ext, mtype string) (shouldBeZipped, iAmSure bool) {
-
-	// text
-	if strings.HasPrefix(mtype, "text/") {
-		return true, true
-	}
-
-	// images
-	switch ext {
-	case ".svg", ".bmp":
-		return true, true
-	}
-	if strings.HasPrefix(mtype, "image/") {
-		return false, true
-	}
-
-	// by file name extension
-	switch ext {
-	case ".zip", ".rar", ".gz", ".bz2", ".xz":
-		return false, true
-	case ".pdf", ".txt", ".html", ".htm", ".css", ".js", ".json":
-		return true, true
-	case ".php", ".java", ".go", ".rb", ".c", ".cpp", ".h", ".hpp":
-		return true, true
-	case ".png", ".jpg", ".jpeg":
-		return false, true
-	}
-
-	// by mime type
-	if strings.HasPrefix(mtype, "application/") {
-		if strings.HasSuffix(mtype, "xml") {
-			return true, true
-		}
-		if strings.HasSuffix(mtype, "script") {
-			return true, true
-		}
-	}
-
-	return false, false
-}
-
-func GzipData(input []byte) ([]byte, error) {
-	buf := new(bytes.Buffer)
-	w, _ := gzip.NewWriterLevel(buf, flate.BestSpeed)
-	if _, err := w.Write(input); err != nil {
-		glog.V(2).Infoln("error compressing data:", err)
-		return nil, err
-	}
-	if err := w.Close(); err != nil {
-		glog.V(2).Infoln("error closing compressed data:", err)
-		return nil, err
-	}
-	return buf.Bytes(), nil
-}
-func UnGzipData(input []byte) ([]byte, error) {
-	buf := bytes.NewBuffer(input)
-	r, _ := gzip.NewReader(buf)
-	defer r.Close()
-	output, err := ioutil.ReadAll(r)
-	if err != nil {
-		glog.V(2).Infoln("error uncompressing data:", err)
-	}
-	return output, err
-}
diff --git a/weed/operation/tail_volume.go b/weed/operation/tail_volume.go
new file mode 100644
index 000000000..0c4f96654
--- /dev/null
+++ b/weed/operation/tail_volume.go
@@ -0,0 +1,78 @@
+package operation
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
+	"github.com/chrislusf/seaweedfs/weed/storage/needle"
+	"google.golang.org/grpc"
+)
+
+func TailVolume(master string, grpcDialOption grpc.DialOption, vid needle.VolumeId, sinceNs uint64, timeoutSeconds int, fn func(n *needle.Needle) error) error {
+	// find volume location, replication, ttl info
+	lookup, err := Lookup(master, vid.String())
+	if err != nil {
+		return fmt.Errorf("look up volume %d: %v", vid, err)
+	}
+	if len(lookup.Locations) == 0 {
+		return fmt.Errorf("unable to locate volume %d", vid)
+	}
+
+	volumeServer := lookup.Locations[0].Url
+
+	return WithVolumeServerClient(volumeServer, grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
+
+		stream, err := client.VolumeTail(context.Background(), &volume_server_pb.VolumeTailRequest{
+			VolumeId:        uint32(vid),
+			SinceNs:         sinceNs,
+			DrainingSeconds: uint32(timeoutSeconds),
+		})
+		if err != nil {
+			return err
+		}
+
+		for {
+			resp, recvErr := stream.Recv()
+			if recvErr != nil {
+				if recvErr == io.EOF {
+					break
+				} else {
+					return recvErr
+				}
+			}
+
+			needleHeader := resp.NeedleHeader
+			needleBody := resp.NeedleBody
+
+			if len(needleHeader) == 0 {
+				continue
+			}
+
+			for !resp.IsLastChunk {
+				resp, recvErr = stream.Recv()
+				if recvErr != nil {
+					if recvErr == io.EOF {
+						break
+					} else {
+						return recvErr
+					}
+				}
+				needleBody = append(needleBody, resp.NeedleBody...)
+			}
+
+			n := new(needle.Needle)
+			n.ParseNeedleHeader(needleHeader)
+			n.ReadNeedleBodyBytes(needleBody, needle.CurrentVersion)
+
+			err = fn(n)
+
+			if err != nil {
+				return err
+			}
+
+		}
+		return nil
+	})
+}
diff --git a/weed/operation/upload_content.go b/weed/operation/upload_content.go
index 4417a0e70..c387d0230 100644
--- a/weed/operation/upload_content.go
+++ b/weed/operation/upload_content.go
@@ -18,6 +18,7 @@ import (
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
 type UploadResult struct {
@@ -59,7 +60,7 @@ func doUpload(uploadUrl string, filename string, reader io.Reader, isGzipped boo
 	contentIsGzipped := isGzipped
 	shouldGzipNow := false
 	if !isGzipped {
-		if shouldBeZipped, iAmSure := IsGzippableFileType(filepath.Base(filename), mtype); iAmSure && shouldBeZipped {
+		if shouldBeZipped, iAmSure := util.IsGzippableFileType(filepath.Base(filename), mtype); iAmSure && shouldBeZipped {
 			shouldGzipNow = true
 			contentIsGzipped = true
 		}