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)
}
