I fixed my code by returning the function inside. But I still need to
understand where to call theses functions to set everything up.
def maintenance_tween_factory(handler, registry):
# Return a tween callable.
# 'handler' is the next tween or the WSGI application.
# Deployment settings are in 'registry.settings'.
def maintenance_tween(handler, request):
is_maintenance_mode = request.registry.settings["in_maintenance"]
if is_maintenance_mode and not "dbmigration" in request.matchdict: # Could
limit it to certain request.path's.
# Return an error response, bypassing the application.
return pyramid.response.HTTPServiceUnavailable(
{
"Maintenance": "Please note that we will be performing important server
maintenance in a few minutes, during which time the server will be
unavailable. If you are in the middle of something important, please save
your work or hold off on any critical actions until we are finished."
}
)
else:
# Call next tween/application and return its response unchanged.
return handler(request)
return maintenance_tween
Le vendredi 8 janvier 2021 à 11:36:52 UTC+1, C J a écrit :
> To everybody: thanks a lot for your answers. Sorry for the delay: I am
> living in France.
> Bay the way I am still interested in the Pyramid CMS solution steps.
>
> Mike,
> I have created a file named maintenance.py in my utils module.
> It contains:
>
> import pyramid
>
> def includeme(config):
> # Calculate the dotted name of the factory function.
> # E.g., "myapp.lib.mytween.my_tween_factory".
> maintenance_tween = __name__ + ".maintenance_tween_factory"
> config.add_tween(maintenance_tween)
> # You can wrap app this in an 'if' to conditionally enable it; e.g.,
> # ``if pyramid.settings.asbool(config.registry.settings.get("myoption",
> True))``
>
>
> def maintenance_tween_factory(handler, registry):
> # Return a tween callable.
> # 'handler' is the next tween or the WSGI application.
> # Deployment settings are in 'registry.settings'.
> def my_tween(handler, request):
> is_maintenance_mode = request.registry.settings["in_maintenance"]
> if is_maintenance_mode and not "dbmigration" in request.matchdict: #
> Could limit it to certain request.path's.
> # Return an error response, bypassing the application.
> return pyramid.response.HTTPServiceUnavailable(
> {
> "Maintenance": "Please note that we will be performing
> important server maintenance in a few minutes, during which time the server
> will be unavailable. If you are in the middle of something important,
> please save your work or hold off on any critical actions
> until we are finished."
> }
> )
> else:
> # Call next tween/application and return its response unchanged.
> return handler(request)
> return maintenance_tween
>
> I have also added *in_maintenance = True* in my production.ini
> file.
>
>
> - Now where should I import this modules? Where should I call these
> functions?
> - Another point is that *maintenance_tween * is unknow in th context
> of def maintenance_tween_factory(handler, registry) so will
> *return maintenance_tween* work?
> - Also I want a Cornice API (dbmigration) which is in my views module
> to still be available in production when I send a POST request or a GET
> request to /dbmigration during the maintenance time.
>
> I have read
> https://pyramid.readthedocs.io/en/latest/narr/hooks.html#registering-tweens
> But I do not understand very well where to write and call the tweens lines
> of code.
>
>
> Le vendredi 8 janvier 2021 à 07:47:18 UTC+1, Mike Orr a écrit :
>
>> I forgot the last line. The end of 'my_tween_factory' needs to 'return
>> my_tween'.
>>
>> On Thu, Jan 7, 2021 at 7:05 PM Mike Orr <slugg...@gmail.com> wrote:
>>
>>> I have a request-logging tween in only a page of code. It's
>>> straightforward to write from the documentation.
>>>
>>>
>>> https://pyramid.readthedocs.io/en/latest/narr/hooks.html#registering-tweens
>>>
>>> I adapted the code for your use case (untested). Your module would have
>>> something like this:
>>>
>>> # Module 'myapp.lib.mytween'
>>>
>>> def includeme(config):
>>> # Calculate the dotted name of the factory function.
>>> # E.g., "myapp.lib.mytween.my_tween_factory".
>>> factory_name = __name__ + ".my_tween_factory"
>>> config.add_tween(factory_name)
>>> # You can wrap app this in an 'if' to conditionally enable it; e.g.,
>>> # ``if
>>> pyramid.settings.asbool(config.registry.settings.get("myoption", True))``
>>>
>>> def my_tween_factory(handler, registry):
>>> # Return a tween callable.
>>> # 'handler' is the next tween or the WSGI application.
>>> # Deployment settings are in 'registry.settings'.
>>> def my_tween(handler, request):
>>> if is_maintenance_mode: # Could limit it to certain
>>> request.path's.
>>> # Return an error response, bypassing the application.
>>> return
>>> pyramid.response.HTTPServiceUnavailable(maintenance_message)
>>> else:
>>> # Call next tween/application and return its response
>>> unchanged.
>>> return handler(request)
>>>
>>> Then list your module in 'pyramid.includes' in the config file. E.g.,
>>> "myapp.lib.mytween".
>>>
>>> That 'if is_maintenance_mode' condition could check whether a specified
>>> file exists. The file path could be in a config setting.
>>>
>>> On Thu, Jan 7, 2021 at 3:32 PM C J <work.ced...@gmail.com> wrote:
>>>
>>>>
>>>> That's really interesting Thierry. Can you please show me how to do?
>>>> I have tried to use tweens. I tried many things starting with
>>>> *pyramid.tweens = pyramid_maintenance.tween_maintenance *and modifying
>>>> the *__init__.py* file, however, I do not understand what they are and
>>>> how to use them despite hours spent reading the Pyramid documentation and
>>>> different articles.
>>>> Being working on a website that is already in production I also wonder
>>>> how I would be able to implement your solution based on an external CMS.
>>>>
>>>>
>>>> [image: Mailtrack]
>>>> <https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality5&;>
>>>> Sender
>>>> notified by
>>>> Mailtrack
>>>> <https://mailtrack.io?utm_source=gmail&utm_medium=signature&utm_campaign=signaturevirality5&;>
>>>> 07/01/21
>>>> à 21:59:31
>>>>
>>>> On Thu, Jan 7, 2021 at 9:22 PM Thierry Florac <tfl...@gmail.com> wrote:
>>>>
>>>>> I've built a custom Pyramid tween to handle this and redirect requests
>>>>> while application is up!
>>>>> It can handle redirects (based on regular expressions) before or after
>>>>> the request is handled by Pyramid application, to be able to set the site
>>>>> in "maintenance mode", or to handle custom redirects in case of NotFound
>>>>> exceptions...
>>>>> All configuration is done through our Pyramid CMS.
>>>>>
>>>>> Best regards,
>>>>> Thierry
>>>>> --
>>>>> https://www.ulthar.net -- http://pyams.readthedocs.io
>>>>>
>>>>>
>>>>> Le jeu. 7 janv. 2021 à 18:43, 'Jonathan Vanasco' via pylons-discuss <
>>>>> pylons-...@googlegroups.com> a écrit :
>>>>>
>>>>>> I typically handle this on nginx which sites in front of Pyramid. if
>>>>>> you wanted to do everything in python, you could probably use WSGI
>>>>>> middleware to route to a separate maintenance application or html file.
>>>>>>
>>>>>> On Thursday, January 7, 2021 at 10:09:34 AM UTC-5 C J wrote:
>>>>>>
>>>>>>> Hi everybody,
>>>>>>>
>>>>>>> I am looking for an easy way to temporarily redirect all the users
>>>>>>> of my pyramid website to a maintenance vue without having to
>>>>>>> comment/delete, etc my routes.
>>>>>>> I would like to make it easy to re-activate the others routes when
>>>>>>> the maintenance is done.
>>>>>>> I found this :
>>>>>>> https://pypi.org/project/pyramid_maintenance/
>>>>>>> but I always get :
>>>>>>>
>>>>>>> in renderer
>>>>>>> raise ValueError('No such renderer factory %s' % str(self.type))
>>>>>>> ValueError: No such renderer factory .jinja2"
>>>>>>>
>>>>>>> with my browser displaying :
>>>>>>> "Internal Server Error The server encountered an unexpected internal
>>>>>>> server error (generated by waitress)"
>>>>>>>
>>>>>>> I am new to Pyramid so please give me the necessary details step by
>>>>>>> step.
>>>>>>>
>>>>>>> Best regards.
>>>>>>> Cedric J.
>>>>>>>
>>>>>> --
>>>>>> You received this message because you are subscribed to the Google
>>>>>> Groups "pylons-discuss" group.
>>>>>> To unsubscribe from this group and stop receiving emails from it,
>>>>>> send an email to pylons-discus...@googlegroups.com.
>>>>>> To view this discussion on the web visit
>>>>>> https://groups.google.com/d/msgid/pylons-discuss/98a779a5-5bcc-4971-a271-a202cc49f732n%40googlegroups.com
>>>>>>
>>>>>> <https://groups.google.com/d/msgid/pylons-discuss/98a779a5-5bcc-4971-a271-a202cc49f732n%40googlegroups.com?utm_medium=email&utm_source=footer>
>>>>>> .
>>>>>>
>>>>> --
>>>>> You received this message because you are subscribed to a topic in the
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>>>>> .
>>>>> To unsubscribe from this group and all its topics, send an email to
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>>>>> To view this discussion on the web visit
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>>>>>
>>>>> <https://groups.google.com/d/msgid/pylons-discuss/CAPX_VWBO5j0im6r0RRKEf%3D%3DzXyx5y_Qp%3DUJ5bntEGQtdiDejKQ%40mail.gmail.com?utm_medium=email&utm_source=footer>
>>>>> .
>>>>>
>>>> --
>>>> You received this message because you are subscribed to the Google
>>>> Groups "pylons-discuss" group.
>>>> To unsubscribe from this group and stop receiving emails from it, send
>>>> an email to pylons-discus...@googlegroups.com.
>>>> To view this discussion on the web visit
>>>> https://groups.google.com/d/msgid/pylons-discuss/CAJgq6FJC11OfFNbfhhPwfMKRJsJfpd2UpWUDs5SAm5hKaMWpzA%40mail.gmail.com
>>>>
>>>> <https://groups.google.com/d/msgid/pylons-discuss/CAJgq6FJC11OfFNbfhhPwfMKRJsJfpd2UpWUDs5SAm5hKaMWpzA%40mail.gmail.com?utm_medium=email&utm_source=footer>
>>>> .
>>>>
>>>
>>>
>>> --
>>> Mike Orr <slugg...@gmail.com>
>>>
>>
>>
>> --
>> Mike Orr <slugg...@gmail.com>
>>
>
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