[jira] [Created] (THRIFT-4591) cannot read call result via lua lib

["allen_lee (JIRA)" <ji...@apache.org>]

allen_lee created THRIFT-4591:
---------------------------------

             Summary: cannot read call result via lua lib
                 Key: THRIFT-4591
                 URL: https://issues.apache.org/jira/browse/THRIFT-4591
             Project: Thrift
          Issue Type: Bug
          Components: Lua - Library
    Affects Versions: 0.11.0
            Reporter: allen_lee
             Fix For: 0.12.0
         Attachments: 9090.pcap, 9090_1.pcap

1) realize thrift server with TNonblockingServer via c++;

2) realize thrift client via lua lib and choose frame transport.

3) call remote interface failed with "TTransportException:0: Default (unknown)" print, and the server show "TConnection::workSocket(): THRIFT_EAGAIN (unavailable resources)" error.

4)investigate this fault with tcpdump tool, attachment 9090.pcap show the frame msg doesnot contains frame size field, the rifht situation of attachment 9090_1.pcap show the frame msg contains 4 bytes (00 00 00 25) before protocol id field.

5) dig into the fault and tried to find root cause, then i found there is an fault in TFramedTransport:flush function in TFramedTransport.lua file. the original realization is:

-----

function TFramedTransport:flush()
  if self.doWrite == false then
    return self.trans:flush()
  end

  -- If the write fails we still want wBuf to be clear
  local tmp = self.wBuf
  self.wBuf = ''
  local frame_len_buf = libluabpack.bpack("i", string.len(tmp))
  self.trans:write(frame_len_buf)
  self.trans:write(tmp)
  self.trans:flush()
end

-----

which send frame size file and reset msg content independently.

 



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