filer: simplify image resize

weed/filer2/stream.go

@@ -44,8 +44,37 @@ func StreamContent(masterClient *wdclient.MasterClient, w io.Writer, chunks []*f
 
 }
 
+// ----------------  ReadAllReader ----------------------------------
+
+func ReadAll(masterClient *wdclient.MasterClient, chunks []*filer_pb.FileChunk) ([]byte, error) {
+
+	buffer := bytes.Buffer{}
+
+	chunkViews := ViewFromChunks(chunks, 0, math.MaxInt32)
+
+	lookupFileId := func(fileId string) (targetUrl string, err error) {
+		return masterClient.LookupFileId(fileId)
+	}
+
+	for _, chunkView := range chunkViews {
+		urlString, err := lookupFileId(chunkView.FileId)
+		if err != nil {
+			glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
+			return nil, err
+		}
+		err = util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk(), chunkView.Offset, int(chunkView.Size), func(data []byte) {
+			buffer.Write(data)
+		})
+		if err != nil {
+			glog.V(1).Infof("read %s failed, err: %v", chunkView.FileId, err)
+			return nil, err
+		}
+	}
+	return buffer.Bytes(), nil
+}
+
+// ----------------  ChunkStreamReader ----------------------------------
 type ChunkStreamReader struct {
-	masterClient *wdclient.MasterClient
 	chunkViews   []*ChunkView
 	logicOffset  int64
 	buffer       []byte
@@ -69,6 +98,7 @@ func NewChunkStreamReaderFromFiler(masterClient *wdclient.MasterClient, chunks [
 	}
 }
 
+
 func (c *ChunkStreamReader) Read(p []byte) (n int, err error) {
 	if c.isBufferEmpty() {
 		if c.chunkIndex >= len(c.chunkViews) {
@@ -144,6 +174,10 @@ func (c *ChunkStreamReader) fetchChunkToBuffer(chunkView *ChunkView) error {
 	return nil
 }
 
+func (c *ChunkStreamReader) Close() {
+	// TODO try to release and reuse buffer
+}
+
 func VolumeId(fileId string) string {
 	lastCommaIndex := strings.LastIndex(fileId, ",")
 	if lastCommaIndex > 0 {

weed/server/filer_server_handlers_read.go

@@ -1,6 +1,7 @@
 package weed_server
 
 import (
+	"bytes"
 	"context"
 	"io"
 	"mime"
@@ -114,8 +115,13 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request,
 		ext := filepath.Ext(filename)
 		width, height, mode, shouldResize := shouldResizeImages(ext, r)
 		if shouldResize {
-			chunkedFileReader := filer2.NewChunkStreamReaderFromFiler(fs.filer.MasterClient, entry.Chunks)
-			rs, _, _ := images.Resized(ext, chunkedFileReader, width, height, mode)
+			data, err := filer2.ReadAll(fs.filer.MasterClient, entry.Chunks)
+			if err != nil {
+				glog.Errorf("failed to read %s: %v", path, err)
+				w.WriteHeader(http.StatusNotModified)
+				return
+			}
+			rs, _, _ := images.Resized(ext, bytes.NewReader(data), width, height, mode)
 			io.Copy(w, rs)
 			return
 		}