Ethan Furman <et...@stoneleaf.us> added the comment:
Here is the test, reduced and in a single script:
--- 8< --------------------------------------------------------------------
import multiprocessing.managers, os, sys, time
if __name__ == '__main__':
address = ("127.0.0.1", 54321)
class TestManager(multiprocessing.managers.BaseManager):
pass
if sys.argv[1] == 'server':
class TestClass(object):
def test_method(self):
print("In test_method")
return "TEST"
TestManager.register("Test", TestClass)
manager = TestManager(address = address, authkey =
"1234".encode("utf-8"))
print('waiting...')
manager.get_server().serve_forever()
else:
TestManager.register("Test")
manager = TestManager(address = address, authkey =
"1234".encode("utf-8"))
manager.connect()
test_class = manager.Test()
print(test_class.test_method())
print("Kill and restart the server and press return")
sys.stdin.readline()
try:
print(test_class.test_method())
except EOFError:
print('EOF received\n')
# reestablish connection
manager.connect()
test_class = manager.Test()
# trigger error
print(test_class.test_method())
--- 8< --------------------------------------------------------------------
Running it in two terminals gives (only showing client side):
---------------------------------------------------------------------------
$ ./python ~/test_mp client
TEST
Kill and restart the server and press return
# hit <return>
EOF received
Traceback (most recent call last):
File "/home/ethan/test_mp", line 45, in <module>
print(test_class.test_method())
File "<string>", line 2, in test_method
File "/source/virtualenv/lib/python3.9/multiprocessing/managers.py", line
808, in _callmethod
conn.send((self._id, methodname, args, kwds))
File "/source/virtualenv/lib/python3.9/multiprocessing/connection.py", line
211, in send
self._send_bytes(_ForkingPickler.dumps(obj))
File "/source/virtualenv/lib/python3.9/multiprocessing/connection.py", line
416, in _send_bytes
self._send(header + buf)
File "/source/virtualenv/lib/python3.9/multiprocessing/connection.py", line
373, in _send
n = write(self._handle, buf)
BrokenPipeError: [Errno 32] Broken pipe
---------------------------------------------------------------------------
The problem appears to be that the call to `manager.connect()` after the EOF is
not getting a new connection, but is reusing the old one (?). This is as far
as I can take this; hopefully somebody with more multiprocessing/socket skills
can take it from here.
----------
nosy: +davin, pitrou, serhiy.storchaka
versions: +Python 3.10, Python 3.11, Python 3.9 -Python 3.8
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43329>
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