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.
>>>>>>
>>>>> --
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>>
>>
>> --
>> Mike Orr <slugg...@gmail.com>
>>
>
>
> --
> Mike Orr <slugg...@gmail.com>
>
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