New submission from Guilherme Salgado <gsalg...@gmail.com>:
multiprocessing.Server swallows original exception traceback, making it hard to
debug. For example, the following code:
```
from multiprocessing.managers import BaseManager
class FooBar(object):
def m(self):
self._raise()
def _raise(self):
raise ValueError
class MyManager(BaseManager):
pass
MyManager.register('Foo', callable=FooBar)
manager = MyManager()
manager.start()
manager.Foo()._callmethod('m')
manager.shutdown()
```
Gives me the following exception:
```
Traceback (most recent call last):
File "/tmp/foo.py", line 15, in <module>
manager.Foo()._callmethod('m')
File "/usr/lib/python3.6/multiprocessing/managers.py", line 772, in
_callmethod
raise convert_to_error(kind, result)
ValueError
```
Ideally, I'd like to get something like this:
```
multiprocessing.pool.RemoteTraceback:
"""
Traceback (most recent call last):
File "/home/salgado/src/cpython/Lib/multiprocessing/managers.py", line 254,
in serve_client
res = function(*args, **kwds)
File "/tmp/foo.py", line 5, in m
self._raise()
File "/tmp/foo.py", line 7, in _raise
raise ValueError
ValueError
"""
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/tmp/foo.py", line 15, in <module>
manager.Foo()._callmethod('m')
File "/home/salgado/src/cpython/Lib/multiprocessing/managers.py", line 811,
in _callmethod
raise convert_to_error(kind, result)
ValueError
```
----------
components: Library (Lib)
messages: 321480
nosy: salgado
priority: normal
severity: normal
status: open
title: multiprocessing.Server swallows original exception traceback
type: enhancement
versions: Python 3.8
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34098>
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