[openstack-dev] [Nova] FFE Request: Oslo: i18n Message improvements

Joe Gordon joe.gordon0 at gmail.com
Fri Mar 7 06:27:49 UTC 2014

On Thu, Mar 6, 2014 at 8:24 PM, Matt Riedemann
<mriedem at linux.vnet.ibm.com> wrote:
> On 3/6/2014 8:08 PM, Matt Riedemann wrote:
>> On 3/6/2014 3:46 PM, James Carey wrote:
>>>      Please consider a FFE for i18n Message improvements:
>>> BP: https://blueprints.launchpad.net/nova/+spec/i18n-messages
>>>      The base enablement for lazy translation has already been sync'd
>>> from oslo.   This patch was to enable lazy translation support in Nova.
>>>   It is titled re-enable lazy translation because this was enabled
>>> during Havana but was pulled due to issues that have since been resolved.
>>>      In order to enable lazy translation it is necessary to do the
>>> following things:
>>>    (1) Fix a bug in oslo with respect to how keywords are extracted from
>>> the format strings when saving replacement text for use when the message
>>> translation is done.   This is
>>> https://bugs.launchpad.net/nova/+bug/1288049, which I'm actively working
>>> on a fix for in oslo.  Once that is complete it will need to be sync'd
>>> into nova.
>>>    (2) Remove concatenation (+) of translatable messages.  The current
>>> class that is used to hold the translatable message
>>> (gettextutils.Message) does not support concatenation.  There were a few
>>> cases in Nova where this was done and they are coverted to other means
>>> of combining the strings in:
>>> https://review.openstack.org/#/c/78095Remove use of concatenation on
>>> messages
>>>    (3) Remove the use of str() on exceptions.  The intent of this is to
>>> return the message contained in the exception, but these messages may
>>> contain unicode, so str cannot be used on them and gettextutils.Message
>>> enforces this.  Thus these need
>>> to either be removed and allow python formatting to do the right thing,
>>> or changed to unicode().  Since unicode() will change to str() in Py3,
>>> the forward compatible six.text_type() is used instead.  This is done in:
>>> https://review.openstack.org/#/c/78096Remove use of str() on exceptions
>>>    (4) The addition of the call that enables the use of lazy messages.
>>>   This is in:
>>> https://review.openstack.org/#/c/73706Re-enable lazy translation.
>>>      Lazy translation has been enabled in the other projects so it would
>>> be beneficial to be consistent with the other projects with respect to
>>> message translation.  I have tested that the changes in (2) and (3) work
>>> when lazy translation is not enabled.  Thus if a problem is found, the
>>> two line change in (4) could be removed to get to the previous behavior.
>>>      I've been talking to Matt Riedemann and Dan Berrange about this.
>>>   Matt has agreed to be a sponsor.
>>>             --Jim Carey
>>> _______________________________________________
>>> OpenStack-dev mailing list
>>> OpenStack-dev at lists.openstack.org
>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>> Jim,
>> Post back here with the link to the oslo-incubator fix for that bug when
>> you have it available, then we can look at this a bit more.
> The oslo patch is here [1].  The bug report has a nice analysis of the
> problem and how H501 makes it so locals() doesn't need to be handled
> anymore.
> If this could get into oslo quickly it could be synced to nova and the
> i18n-messages patches would be rebased on top of it.
> As Jim pointed out, if there was a problem with enabling lazy translation in
> nova it'd be a trivial change to disable it again.
> There was concern raised in IRC today about wanting a Tempest scenario test
> to also hit this code, something along the lines of passing zh_CN through
> the request to make sure nothing blows up.  I think that's reasonable but
> we'd probably need some help from the QA team in figuring out exactly what
> needs to be run there.  I don't have much experience with the scenario
> tests, I just know their main purpose is to test inter-service interaction.
> [1] https://review.openstack.org/#/c/78806/

Being there are some testing desires for this, and the fix hasn't
landed in oslo-incubator yet,  I am -1 on this.

> --
> Thanks,
> Matt Riedemann
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> OpenStack-dev at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev

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