func (vs *VolumeServer) getVolumeDataContentHandler(w http.ResponseWriter, r *http.Request) { v, err := vs.getVolume("volume", r) if v == nil { writeJsonError(w, r, http.StatusBadRequest, fmt.Errorf("Not Found volume: %v", err)) return } if int(v.SuperBlock.CompactRevision) != util.ParseInt(r.FormValue("revision"), 0) { writeJsonError(w, r, http.StatusExpectationFailed, fmt.Errorf("Requested Volume Revision is %s, but current revision is %d", r.FormValue("revision"), v.SuperBlock.CompactRevision)) return } offset := uint32(util.ParseUint64(r.FormValue("offset"), 0)) size := uint32(util.ParseUint64(r.FormValue("size"), 0)) content, block, err := storage.ReadNeedleBlob(v.DataFile(), int64(offset)*storage.NeedlePaddingSize, size) defer storage.ReleaseBytes(block.Bytes) if err != nil { writeJsonError(w, r, http.StatusInternalServerError, err) return } id := util.ParseUint64(r.FormValue("id"), 0) n := new(storage.Needle) n.ParseNeedleHeader(content) if id != n.Id { writeJsonError(w, r, http.StatusNotFound, fmt.Errorf("Expected file entry id %d, but found %d", id, n.Id)) return } w.Write(content) }