[lupa-dev] Proper Error propagation
- From: Arthur Skowronek <eisensheng@xxxxxxxxx>
- To: lupa-dev@xxxxxxxxxxxxx
- Date: Thu, 5 Jun 2014 18:41:19 +0200
Hey list,
I hope you can help me with this. I'm having an issue with handling errors
within lua code. What I'm trying to do is:
from __future__ import absolute_import, print_function, unicode_literals
from lupa import LuaRuntime
l = LuaRuntime()
l.execute('''
function do_something_that_fails()
error('lua error happened')
end
local function _print_traceback(err)
print(debug.traceback(err, 2))
end
function do_protected()
return xpcall(function ()
do_in_python()
end, _print_traceback)
end
''')
l.globals().do_in_python = lambda: l.globals().do_something_that_fails()
l.globals().do_protected()
The corresponding output is:
[string "<python>"]:14: error during Python call
stack traceback:
[C]: in function 'do_in_python'
[string "<python>"]:14: in function <[string "<python>"]:13>
[C]: in function 'xpcall'
[string "<python>"]:13: in function <[string "<python>"]:12>
Traceback (most recent call last):
File "local/lupa_test.py", line 29, in <module>
l.globals().do_protected()
File "_lupa.pyx", line 327, in lupa._lupa._LuaObject.__call__
(lupa/_lupa.c:5319)
File "_lupa.pyx", line 963, in lupa._lupa.call_lua (lupa/_lupa.c:13506)
File "_lupa.pyx", line 971, in lupa._lupa.execute_lua_call
(lupa/_lupa.c:13617)
File "_lupa.pyx", line 154, in lupa._lupa.LuaRuntime.reraise_on_exception
(lupa/_lupa.c:3210)
File "_lupa.pyx", line 1060, in lupa._lupa.py_call_with_gil
(lupa/_lupa.c:14447)
File "_lupa.pyx", line 1054, in lupa._lupa.call_python
(lupa/_lupa.c:14344)
File "local/lupa_test.py", line 27, in <lambda>
l.globals().do_in_python = lambda: l.globals().do_something_that_fails()
File "_lupa.pyx", line 327, in lupa._lupa._LuaObject.__call__
(lupa/_lupa.c:5319)
File "_lupa.pyx", line 963, in lupa._lupa.call_lua (lupa/_lupa.c:13506)
File "_lupa.pyx", line 973, in lupa._lupa.execute_lua_call
(lupa/_lupa.c:13636)
File "_lupa.pyx", line 924, in lupa._lupa.raise_lua_error
(lupa/_lupa.c:12990)
lupa._lupa.LuaError: [string "<python>"]:3: lua error happened
The desired behavior would be that the lua function do_protected would
handle the error that was reported by do_something_that_fails. It looks
like the error handling is interrupted by the call to the python function
do_in_python and converted into an exception though. So all the lua code
can see is that "something happened within python". I would like to have
the first lua function would see the entire traceback. How can I achieve
this? Thanks for any advice!
Cheers,
Arthur
Other related posts:
