Re: [pylons-discuss] Re: Pyramid maintenance mode

2021-01-07 Thread Mike Orr 
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  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  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]
>> 
>>  Sender
>> notified by
>> Mailtrack
>> 
>>  07/01/21
>> à 21:59:31
>>
>> On Thu, Jan 7, 2021 at 9:22 PM Thierry Florac  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-discuss@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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Re: [pylons-discuss] Re: Pyramid maintenance mode

2021-01-07 Thread Mike Orr 
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  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]
> 
>  Sender
> notified by
> Mailtrack
> 
>  07/01/21
> à 21:59:31
>
> On Thu, Jan 7, 2021 at 9:22 PM Thierry Florac  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-discuss@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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>>> Groups "pylons-discuss" group.
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>>> 
>>> .
>>>
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Re: [pylons-discuss] Re: Pyramid maintenance mode

2021-01-07 Thread C J 
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]

Sender
notified by
Mailtrack

07/01/21
à 21:59:31

On Thu, Jan 7, 2021 at 9:22 PM Thierry Florac  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-discuss@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-discuss+unsubscr...@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
>> 
>> .
>>
> --
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> 
> .
>

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[pylons-discuss] Re: Pyramid maintenance mode

2021-01-07 Thread 'Jonathan Vanasco' via pylons-discuss 
i should add, the pattern for doing this in nginx is often called a flag or 
semaphore

i found this article that goes through a 
how-to  
https://blog.devcloud.hosting/configuring-nginx-for-quickly-switching-to-maintenance-mode-e4136cf497f3

basically, you just touch/remove a specific file to change the routing on 
nginx. while the existence of the file is checked on every request, due to 
the way nginx and operating system cache the information this is negligible 
and essentially handled in memory.

On Thursday, January 7, 2021 at 12:43:46 PM UTC-5 Jonathan Vanasco wrote:

> 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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Re: [pylons-discuss] Re: Pyramid maintenance mode

2021-01-07 Thread Thierry Florac 
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-discuss@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
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> To view this discussion on the web visit
> https://groups.google.com/d/msgid/pylons-discuss/98a779a5-5bcc-4971-a271-a202cc49f732n%40googlegroups.com
> 
> .
>

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[pylons-discuss] Re: Pyramid maintenance mode

2021-01-07 Thread 'Jonathan Vanasco' via pylons-discuss 
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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[pylons-discuss] Pyramid maintenance mode

2021-01-07 Thread C J 
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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