New submission from Bala FA <barum...@redhat.com>:
I use multiprocess in one of my project. When an exception which
requires mandatory argument is raised by a server process, is not
re-raised properly to client process. I get an error something like
below
Traceback (most recent call last):
File "prod.py", line 69, in <module>
main()
File "prod.py", line 61, in main
print myobj.fun3()
File "<string>", line 2, in fun3
File "/usr/lib64/python2.7/multiprocessing/managers.py", line 759,
in _callmethod
kind, result = conn.recv()
TypeError: ('__init__() takes exactly 2 arguments (1 given)', <class
'__main__.MyException2'>, ())
However, if an exception which has optional argument is raised by
server process, is re-raised properly to client process.
Below is a reproducer.
#!/usr/bin/python
import sys
import os
import time
import subprocess
from multiprocessing.managers import BaseManager
class MyManager(BaseManager):
pass
class MyException1(Exception):
def __init__(self, msg=''):
self.msg = msg
def __str__(self):
return self.msg
class MyException2(Exception):
def __init__(self, msg):
self.msg = msg
def __str__(self):
return self.msg
class MyClass(object):
def fun1(self):
return 'this is fun1'
def fun2(self):
raise MyException1('fun2 raised')
def fun3(self):
raise MyException2('fun3 raised')
def runManager():
manager = MyManager(address=('', 50000), authkey='abc')
manager.register('instance', callable=MyClass)
server = manager.get_server()
print "manager is running"
server.serve_forever()
def startManager():
p = subprocess.Popen(['python', __file__, 'manager'])
time.sleep(1)
return p
def main():
p = startManager()
manager = MyManager(address=('', 50000), authkey='abc')
manager.register('instance')
print "connecting to manager"
manager.connect()
myobj = manager.instance()
print myobj.fun1()
try:
print myobj.fun2()
except MyException1, e:
print e
try:
print myobj.fun3()
except MyException2, e:
print e
finally:
p.kill()
if __name__ == '__main__':
if len(sys.argv) == 1:
main()
else:
runManager()
I use python 2.7.3 on fedora 17 on x86_64 (rpm version is
python-2.7.3-6.fc17.x86_64)
----------
components: Interpreter Core
messages: 166299
nosy: Bala.FA
priority: normal
severity: normal
status: open
title: multiprocess fails to re-raise exception which has mandatory arguments
type: crash
versions: Python 2.7
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15440>
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