[TINKERPOP-2021] Prevent maximum recursion depth failure

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.3.3
• Fix Version/s: 3.4.0, 3.3.4
• Component/s: python
• Assignee: Stephen Mallette
• Reporter: Stephen Mallette
• Created: 08/Aug/18 11:39
• Updated: 04/Sep/18 19:00
• Resolved: 04/Sep/18 19:00

Description

There have been at least two separate reported errors around "maximum recursion depth":

https://groups.google.com/d/msg/gremlin-users/9X9wuUnrFAQ/-cIUYPDYCwAJ

https://stackoverflow.com/q/51741181/1831717

Typical error message looks like this:

ERROR | tornado.application | function: handle_callback_exception | line: 638 | Exception in callback functools.partial(<function wrap.<locals>.null_wrapper at 0x1097911e0>)
Traceback (most recent call last):
  File "~/.local/share/virtualenvs/caladrius-5FocEuMm/lib/python3.6/site-packages/tornado/ioloop.py", line 605, in _run_callback
    ret = callback()
  File "~/.local/share/virtualenvs/caladrius-5FocEuMm/lib/python3.6/site-packages/tornado/stack_context.py", line 277, in null_wrapper
    return fn(*args, **kwargs)
  File "~/.local/share/virtualenvs/caladrius-5FocEuMm/lib/python3.6/site-packages/tornado/iostream.py", line 562, in wrapper
    return callback(*args)
  File "~/.local/share/virtualenvs/caladrius-5FocEuMm/lib/python3.6/site-packages/tornado/stack_context.py", line 345, in wrapped
    raise_exc_info(exc)
  File "<string>", line 4, in raise_exc_info
  File "~/.local/share/virtualenvs/caladrius-5FocEuMm/lib/python3.6/site-packages/tornado/stack_context.py", line 316, in wrapped
    ret = fn(*args, **kwargs)
  File "~/.local/share/virtualenvs/caladrius-5FocEuMm/lib/python3.6/site-packages/tornado/websocket.py", line 869, in _on_frame_length_64
    self._read_frame_data(False)
  File "~/.local/share/virtualenvs/caladrius-5FocEuMm/lib/python3.6/site-packages/tornado/websocket.py", line 849, in _read_frame_data
    self._on_masked_frame_data if masked else self._on_frame_data)
  File "~/.local/share/virtualenvs/caladrius-5FocEuMm/lib/python3.6/site-packages/tornado/iostream.py", line 319, in read_bytes
    assert isinstance(num_bytes, numbers.Integral)
  File "~/.local/share/virtualenvs/caladrius-5FocEuMm/bin/../lib/python3.6/abc.py", line 184, in __instancecheck__
    if subclass in cls._abc_cache:
  File "~/.local/share/virtualenvs/caladrius-5FocEuMm/bin/../lib/python3.6/_weakrefset.py", line 75, in __contains__
    return wr in self.data
RecursionError: maximum recursion depth exceeded in comparison

doesn't seem to happen on 3.2.9.