Bug: uuid.uuid4() causes OmeroPy client creation to fail on Mac OSX

[jamoore]

When starting multiple django processes on Mac OSX, two different PIDs might generate the same client UUID leading to a failed login:

Thu, 06 Jan 2011 16:24:18 blitz_gateway DEBUG    Connect attempt, pid=15591, sUuid=b0837a80-0e35-4032-92d3-aaa0cd08a95c, group=None, self.sUuid=None, self._BaseClient__uuid=9d9873d9-bc2e-4fb9-a51f-313b30995234
24:38
Thu, 06 Jan 2011 16:24:21 blitz_gateway DEBUG    Connect attempt, pid=15590, sUuid=b0837a80-0e35-4032-92d3-aaa0cd08a95c, group=None, self.sUuid=None, self._BaseClient__uuid=9d9873d9-bc2e-4fb9-a51f-313b30995234

produces something like:

2011-01-06 13:40:48,864 ERROR [ ome.services.blitz.fire.SessionManagerI] (l.Server-5) Error while creating ServiceFactoryI
Ice.AlreadyRegisteredException
    kindOfObject = "servant"
    id = "session-ffb674a5-6ec1-4d17-8d6c-0afef9559b1c/f2fa1c4b-411e-4a92-88e6-8a3bc2f2b772"
        at IceInternal.ServantManager.addServant(ServantManager.java:34)

See:

• ​http://stackoverflow.com/questions/2759644/python-multiprocessing-doesnt-play-nicely-with-uuid-uuid4
• ​http://bugs.python.org/issue8621

[jmoore]

Under Python 2.6.6, the workaround is already in place:

$ python
Python 2.6.6 (r266:84292, Dec 30 2010, 16:35:14) 
[GCC 4.2.1 (Apple Inc. build 5664)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import uuid
>>> uuid._uuid_generate_random
>>> uuid._uuid_generate_time

[jmoore]

I plan to apply this to our use of uuid in omero/clients.py: ​http://svn.python.org/view/python/branches/release26-maint/Lib/uuid.py?r1=82277&r2=82276&pathrev=82277

[cneves]

Because I've been having this issue for a long time now, and because updating to 2.6.6 would be dependency hell all over again, I followed the link on the previous comment and downloaded ​http://svn.python.org/view/*checkout*/python/branches/release26-maint/Lib/uuid.py placing it in lib/python/omero/nuuid.py

I then changed lib/python/omero/clients.py from:

  import uuid

to

  import omero.nuuid as uuid

and changed nuuid.py from

 import sys

to

 sys = __import__('sys')

to prevent omero.sys to be imported. All works wonderfully now!

FYI, I'm on OSX 10.6 with default python 2.6.1.

[jmoore]

(In [8903/omero]) Added omero_ext.uuid.py for handling Python:#8621 (Fix #3774)

The new idiom for importing uuid is:

      import omero_ext.uuid as uuid # see ticket:3774

[Carlos Neves <carlos@…>]

(In [5b04916524c57f02c8c51876eb9c3be130dd2d98/ome.git]) Added omero_ext.uuid.py for handling Python:#8621 (Fix #3774)

The new idiom for importing uuid is:

      import omero_ext.uuid as uuid # see ticket:3774

[jmoore <josh@…>]

(In [40ddaa8c242e974d97211baad64848ec70f68f21/ome.git] on branch develop) Fixing use of uuid4 in servants.py (See #3774)

[jmoore <josh@…>]

(In [dbbf3e9b3d7d65c1b924921f1ab40e1734ef4f7a/ome.git] on branch dev_4_2) Fixing use of uuid4 in servants.py (See #3774)

[Carlos Neves <carlos@…>]

(In [5b04916524c57f02c8c51876eb9c3be130dd2d98/ome.git]on branches 4_1_custom, dev_4_1_custom, josh/4.1-web-backport) Added omero_ext.uuid.py for handling Python:#8621 (Fix #3774)

The new idiom for importing uuid is:

      import omero_ext.uuid as uuid # see ticket:3774