Re: Provide a way to pass kwargs when initializing the storage class

2015-11-12 Thread James Aylett
On 8 Nov 2015, at 08:31, Marc Tamlyn  wrote:

> I'm definitely in favour of a format allowing multiple storage back ends 
> referred to by name. For larger sites it is not unusual to manage files 
> across multiple locations (eg several S3 buckets). The storage param to 
> FileField would be allowed to be the key, and there would be a get_storage 
> function like get_cache.

It would remove the assymetry between the default backends and per-field ones, 
which does feel a little odd. However I don’t think that’s a strong enough 
reason to go for more complicated. Ballooning dictionaries can feel 
overwhelming when looking at modern Django settings (for instance, the new 
templates configuration is more daunting than it used to be), and as pointed 
out, overriding is more fiddly.

For testing, you need to be explicit per-field no matter what, so it’s a change 
from an instance to a symbolic reference. The instance is probably a variable 
anyway by declaration of the test model, which I suspect is slightly easier to 
chase.

So I’d be slightly more in favour of the terse, tuple-based syntax.

J

-- 
 James Aylett
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Re: Provide a way to pass kwargs when initializing the storage class

2015-11-08 Thread Shai Berger
On Sunday 08 November 2015 10:31:06 Marc Tamlyn wrote:
> 
> (Side point: a temp dir based storage which could clean itself up between
> rest runs would be amazing)
> 
Yes, it would. https://code.djangoproject.com/ticket/23251


Re: Provide a way to pass kwargs when initializing the storage class

2015-11-08 Thread Marc Tamlyn
I'm definitely in favour of a format allowing multiple storage back ends
referred to by name. For larger sites it is not unusual to manage files
across multiple locations (eg several S3 buckets). The storage param to
FileField would be allowed to be the key, and there would be a get_storage
function like get_cache.

This is especially useful when testing locally as you can swap out
dependencies on external server storages for local temp storage.

(Side point: a temp dir based storage which could clean itself up between
rest runs would be amazing)
On 7 Nov 2015 17:07, "Claude Paroz"  wrote:

> The drawback of complex dictionary settings is that to overwrite only one
> key in a settings file, you have to copy the entire dictionary, also
> possibly defeating global settings defaults when they change.
>
> So let's try to have many smaller dictionaries instead of few big ones.
> The initial proposal was a bit better at this regard.
>
> Claude
>
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Re: Provide a way to pass kwargs when initializing the storage class

2015-11-07 Thread Claude Paroz
The drawback of complex dictionary settings is that to overwrite only one 
key in a settings file, you have to copy the entire dictionary, also 
possibly defeating global settings defaults when they change.

So let's try to have many smaller dictionaries instead of few big ones. The 
initial proposal was a bit better at this regard.

Claude

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Re: Provide a way to pass kwargs when initializing the storage class

2015-11-07 Thread Sean Brant
+1 to these ideas. This will make injecting dependancies much cleaner. I’ve 
pointed my BACKEND settings to factory functions in the past.


def storage_factory():
return SomeStorage(some_de)


DEFAULT_STORAGE_BACKEND = ‘path.to.storage_factory'


> On Nov 7, 2015, at 7:10 AM, Shai Berger  wrote:
> 
> On Saturday 07 November 2015 14:55:20 Aymeric Augustin wrote:
>> 
>> Essentially your proposal means reformatting the current file-related
>> settings to this structure:
>> 
>> FILE_STORAGES = {
>>‘media’: {
>>‘BACKEND’: settings.DEFAULT_FILE_STORAGE,
>>‘OPTIONS’: {
>> ‘location’: settings.MEDIA_ROOT,
>> ‘base_url’: settings.MEDIA_URL,
>> # possible override of settings.FILE_CHARSET
>>},
>>},
>>‘static’: {
>>‘BACKEND’: settings.STATICFILES_STORAGE,
>>‘OPTIONS’: {
>> ‘location’: settings.STATIC_ROOT,
>> ‘base_url’: settings.STATIC_URL,
>> # replacement for STATICFILES_FINDERS and STATICFILES_DIRS
>> that would look a lot like template loaders # possible override of
>> settings.FILE_CHARSET
>>},
>> 
>>}
>> }
>> 
>> 
>> How do people feel about this alternative proposal?
>> 
> 
> This, in general, seems like the right thing to do. The only reservation I 
> have is that the 'OPTIONS' key seems superfluous -- why not put the options 
> in 
> the same dictionary as the backend?
> 
> On a related point -- I wouldn't put base_url in there. It is related to 
> files, 
> but not to their storage.
> 
> My 2KB,
>   Shai.

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Re: Provide a way to pass kwargs when initializing the storage class

2015-11-07 Thread Shai Berger
On Saturday 07 November 2015 14:55:20 Aymeric Augustin wrote:
> 
> Essentially your proposal means reformatting the current file-related
> settings to this structure:
> 
> FILE_STORAGES = {
> ‘media’: {
> ‘BACKEND’: settings.DEFAULT_FILE_STORAGE,
> ‘OPTIONS’: {
>  ‘location’: settings.MEDIA_ROOT,
>  ‘base_url’: settings.MEDIA_URL,
>  # possible override of settings.FILE_CHARSET
> },
> },
> ‘static’: {
> ‘BACKEND’: settings.STATICFILES_STORAGE,
> ‘OPTIONS’: {
>  ‘location’: settings.STATIC_ROOT,
>  ‘base_url’: settings.STATIC_URL,
>  # replacement for STATICFILES_FINDERS and STATICFILES_DIRS
> that would look a lot like template loaders # possible override of
> settings.FILE_CHARSET
> },
> 
> }
> }
> 
> 
> How do people feel about this alternative proposal?
> 

This, in general, seems like the right thing to do. The only reservation I 
have is that the 'OPTIONS' key seems superfluous -- why not put the options in 
the same dictionary as the backend?

On a related point -- I wouldn't put base_url in there. It is related to files, 
but not to their storage.

My 2KB,
Shai.


Re: Provide a way to pass kwargs when initializing the storage class

2015-11-07 Thread Aymeric Augustin
Hello,

Indeed, if we took a big step further and provided an API to configure multiple 
file storage backends, that would make sense.

Currently we have two hardcoded ones: the default, which is used for media 
files, and the static, which is used for static files.

Essentially your proposal means reformatting the current file-related settings 
to this structure:

FILE_STORAGES = {
‘media’: {
‘BACKEND’: settings.DEFAULT_FILE_STORAGE,
‘OPTIONS’: {
 ‘location’: settings.MEDIA_ROOT,
 ‘base_url’: settings.MEDIA_URL,
 # possible override of settings.FILE_CHARSET
},
},
‘static’: {
‘BACKEND’: settings.STATICFILES_STORAGE,
‘OPTIONS’: {
 ‘location’: settings.STATIC_ROOT,
 ‘base_url’: settings.STATIC_URL,
 # replacement for STATICFILES_FINDERS and STATICFILES_DIRS that 
would look a lot like template loaders
 # possible override of settings.FILE_CHARSET
},

}
}

The FILE_UPLOAD_* settings wouldn’t change because they don’t affect file 
storage.

It isn’t entirely clear to me what the best way to reconcile “default” and 
“media” would be. Currently they’re effectively the same but settings are named 
inconsistently for historical reasons. In addition this would require an API 
for getting a file storage backend.

This is a much more invasive change as it would require everyone to update 
their settings. However it would meet some use cases much better. Pluggable 
apps that need to store files could document that they’ll use the backend with 
a given name it if exists and fall back to the default backend otherwise. 
That’s exactly what django.contrib.sessions currently does with cache.

How do people feel about this alternative proposal?

-- 
Aymeric.



> On 7 nov. 2015, at 12:58, Raphaël Barrois  wrote:
> 
> Hello,
> 
> 
> The core of the proposed solution seems quite interesting; however, it also 
> introduces a new configuration format for backends.
> 
> Caches and databases use a dict with a "BACKEND" key and an "OPTIONS" dict 
> for kwargs to pass to the backend.
> Likewise, entries in the TEMPLATES list are dicts with a "BACKEND" key and 
> various options.
> 
> 
> Do you think that the new setting should match these options instead of the 
> proposed two-tuples?
> 
> 
> -- 
> Raphaël
> 
> 
> On Sat, 7 Nov 2015 12:15:49 +0100
> Aymeric Augustin  wrote:
> 
>> Hello,
>> 
>> Currently the DEFAULT_FILE_STORAGE and STATICFILES_STORAGE settings
>> contain a dotted Python path to the storage class. The class is
>> instantiated without any arguments.
>> 
>> 
>> ** Problem **
>> 
>> This leads to three annoyances.
>> 
>> 1) Third-party libraries like django-storages(-redux) need to provide
>> a setting for every value that could be required to configure the
>> storage. This additional level of indirection is annoying.
>> 
>> If you’re skeptical, look at
>> https://github.com/jschneier/django-storages/blob/f2880b16b57a36b241a54932255e1a852c0e0ac7/storages/backends/s3boto.py#L204
>> .
>> 
>> 2) Compounding this problem, third-party libraries that want to use a
>> Django storage backend, but likely not the default one, have no
>> convenient way for the user to configure the storage.
>> 
>> Having settings such as `MY_THIRD_PARTY_APP__AWS_ACCESS_KEY_ID` etc.
>> for every possible storage-related setting sounds unreasonable.
>> 
>> (This is the problem I’m facing right now with one of my libraries.)
>> 
>> 3) The standard pattern for working around these problems is
>> boilerplate-ish:
>> 
>> my_config = {foo: bar}
>> 
>> class ConfiguredStorageClass(GenericStorageClass):
>>def __init__(self, *args, **kwargs):
>>kwargs.update(my_config)
>>super().__init__(*args, **kwargs)
>> 
>> DEFAULT_FILE_STORAGE = 'path.to.ConfiguredStorageClass'
>> 
>> 
>> ** Proposed solution **
>> 
>> To solve this problem, I would like the DEFAULT_FILE_STORAGE and
>> STATICFILES_STORAGE settings to accept an additional format: a 2-uple
>> of (dotted Python path to class, init_kwargs).
>> 
>> This would allow simplifying the example above to:
>> 
>> DEFAULT_FILE_STORAGE = ‘path.to.GenericStorageClass’, {foo: bar}
>> 
>> 
>> ** Variants **
>> 
>> We could go a bit further support 2-uples with args, 2-uples with
>> kwargs, and 3-uples with args and kwargs. I didn’t propose it because
>> I’m not sure this possibility adds much value. Arguments can be
>> passed as kwargs even if the init method expects them positionally.
>> 
>> We could support setting DEFAULT_FILE_STORAGE and STATICFILES_STORAGE
>> to an already initialized instance of a storage class. I’m against
>> this idea because settings should remain primitive Python values
>> whenever possible.
>> 
>> We could introduce 

Re: Provide a way to pass kwargs when initializing the storage class

2015-11-07 Thread 'Tom Evans' via Django developers (Contributions to Django itself)
On Sat, Nov 7, 2015 at 11:58 AM, Raphaël Barrois
 wrote:
> Hello,
>
>
> The core of the proposed solution seems quite interesting; however, it also 
> introduces a new configuration format for backends.
>
> Caches and databases use a dict with a "BACKEND" key and an "OPTIONS" dict 
> for kwargs to pass to the backend.
> Likewise, entries in the TEMPLATES list are dicts with a "BACKEND" key and 
> various options.
>
>
> Do you think that the new setting should match these options instead of the 
> proposed two-tuples?

I like explicit:

STORAGE = {
'default': {
'ENGINE': 'path.to.foo.Storage',
'OPTIONS': { ..}
},
}

Cheers

Tom

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Re: Provide a way to pass kwargs when initializing the storage class

2015-11-07 Thread Raphaël Barrois
Hello,


The core of the proposed solution seems quite interesting; however, it also 
introduces a new configuration format for backends.

Caches and databases use a dict with a "BACKEND" key and an "OPTIONS" dict for 
kwargs to pass to the backend.
Likewise, entries in the TEMPLATES list are dicts with a "BACKEND" key and 
various options.


Do you think that the new setting should match these options instead of the 
proposed two-tuples?


-- 
Raphaël


On Sat, 7 Nov 2015 12:15:49 +0100
Aymeric Augustin  wrote:

> Hello,
> 
> Currently the DEFAULT_FILE_STORAGE and STATICFILES_STORAGE settings
> contain a dotted Python path to the storage class. The class is
> instantiated without any arguments.
> 
> 
> ** Problem **
> 
> This leads to three annoyances.
> 
> 1) Third-party libraries like django-storages(-redux) need to provide
> a setting for every value that could be required to configure the
> storage. This additional level of indirection is annoying.
> 
> If you’re skeptical, look at
> https://github.com/jschneier/django-storages/blob/f2880b16b57a36b241a54932255e1a852c0e0ac7/storages/backends/s3boto.py#L204
> .
> 
> 2) Compounding this problem, third-party libraries that want to use a
> Django storage backend, but likely not the default one, have no
> convenient way for the user to configure the storage.
> 
> Having settings such as `MY_THIRD_PARTY_APP__AWS_ACCESS_KEY_ID` etc.
> for every possible storage-related setting sounds unreasonable.
> 
> (This is the problem I’m facing right now with one of my libraries.)
> 
> 3) The standard pattern for working around these problems is
> boilerplate-ish:
> 
> my_config = {foo: bar}
> 
> class ConfiguredStorageClass(GenericStorageClass):
> def __init__(self, *args, **kwargs):
> kwargs.update(my_config)
> super().__init__(*args, **kwargs)
> 
> DEFAULT_FILE_STORAGE = 'path.to.ConfiguredStorageClass'
> 
> 
> ** Proposed solution **
> 
> To solve this problem, I would like the DEFAULT_FILE_STORAGE and
> STATICFILES_STORAGE settings to accept an additional format: a 2-uple
> of (dotted Python path to class, init_kwargs).
> 
> This would allow simplifying the example above to:
> 
> DEFAULT_FILE_STORAGE = ‘path.to.GenericStorageClass’, {foo: bar}
> 
> 
> ** Variants **
> 
> We could go a bit further support 2-uples with args, 2-uples with
> kwargs, and 3-uples with args and kwargs. I didn’t propose it because
> I’m not sure this possibility adds much value. Arguments can be
> passed as kwargs even if the init method expects them positionally.
> 
> We could support setting DEFAULT_FILE_STORAGE and STATICFILES_STORAGE
> to an already initialized instance of a storage class. I’m against
> this idea because settings should remain primitive Python values
> whenever possible.
> 
> We could introduce DEFAULT_FILE_STORAGE_INIT_KWARGS and
> STATICFILES_STORAGE_INIT_KWARGS. Well. Perhaps not :-)
> 
> 
> What do you think?
> 

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Re: Provide a way to pass kwargs when initializing the storage class

2015-11-07 Thread James Aylett
I'm +1 on this solution; it solves the problem in an efficient way without 
becoming unreadable. I'd shy away from the variants unless/until there's a 
definite need. kwargs are more explicit, which I think is helpful in 
readability :)

J


On Saturday, November 7, 2015 at 12:16:05 PM UTC+1, Aymeric Augustin wrote:
>
> Hello,
>
> Currently the DEFAULT_FILE_STORAGE and STATICFILES_STORAGE settings 
> contain a dotted Python path to the storage class. The class is 
> instantiated without any arguments.
>
>
> ** Problem **
>
> This leads to three annoyances.
>
> 1) Third-party libraries like django-storages(-redux) need to provide a 
> setting for every value that could be required to configure the storage. 
> This additional level of indirection is annoying.
>
> If you’re skeptical, look at 
> https://github.com/jschneier/django-storages/blob/f2880b16b57a36b241a54932255e1a852c0e0ac7/storages/backends/s3boto.py#L204
> .
>
> 2) Compounding this problem, third-party libraries that want to use a 
> Django storage backend, but likely not the default one, have no convenient 
> way for the user to configure the storage.
>
> Having settings such as `MY_THIRD_PARTY_APP__AWS_ACCESS_KEY_ID` etc. for 
> every possible storage-related setting sounds unreasonable.
>
> (This is the problem I’m facing right now with one of my libraries.)
>
> 3) The standard pattern for working around these problems is 
> boilerplate-ish:
>
> my_config = {foo: bar}
>
> class ConfiguredStorageClass(GenericStorageClass):
> def __init__(self, *args, **kwargs):
> kwargs.update(my_config)
> super().__init__(*args, **kwargs)
>
> DEFAULT_FILE_STORAGE = 'path.to.ConfiguredStorageClass'
>
>
> ** Proposed solution **
>
> To solve this problem, I would like the DEFAULT_FILE_STORAGE and 
> STATICFILES_STORAGE settings to accept an additional format: a 2-uple of 
> (dotted Python path to class, init_kwargs).
>
> This would allow simplifying the example above to:
>
> DEFAULT_FILE_STORAGE = ‘path.to.GenericStorageClass’, {foo: bar}
>
>
> ** Variants **
>
> We could go a bit further support 2-uples with args, 2-uples with kwargs, 
> and 3-uples with args and kwargs. I didn’t propose it because I’m not sure 
> this possibility adds much value. Arguments can be passed as kwargs even if 
> the init method expects them positionally.
>
> We could support setting DEFAULT_FILE_STORAGE and STATICFILES_STORAGE to 
> an already initialized instance of a storage class. I’m against this idea 
> because settings should remain primitive Python values whenever possible.
>
> We could introduce DEFAULT_FILE_STORAGE_INIT_KWARGS and 
> STATICFILES_STORAGE_INIT_KWARGS. Well. Perhaps not :-)
>
>
> What do you think?
>
> -- 
> Aymeric.
>
>
>
>

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Re: Provide a way to pass kwargs when initializing the storage class

2015-11-07 Thread charettes
I think the proposed approach makes sense.

I don't think we need to support any variant to pass the configuration 
values as args. All the existing storage backends have to make their 
argument optionals anyway now to support how they are currently initialized.

Requiring a dict makes it also more explicit about what values actually 
mean and support both cases.

Simon

Le samedi 7 novembre 2015 12:16:05 UTC+1, Aymeric Augustin a écrit :
>
> Hello,
>
> Currently the DEFAULT_FILE_STORAGE and STATICFILES_STORAGE settings 
> contain a dotted Python path to the storage class. The class is 
> instantiated without any arguments.
>
>
> ** Problem **
>
> This leads to three annoyances.
>
> 1) Third-party libraries like django-storages(-redux) need to provide a 
> setting for every value that could be required to configure the storage. 
> This additional level of indirection is annoying.
>
> If you’re skeptical, look at 
> https://github.com/jschneier/django-storages/blob/f2880b16b57a36b241a54932255e1a852c0e0ac7/storages/backends/s3boto.py#L204
> .
>
> 2) Compounding this problem, third-party libraries that want to use a 
> Django storage backend, but likely not the default one, have no convenient 
> way for the user to configure the storage.
>
> Having settings such as `MY_THIRD_PARTY_APP__AWS_ACCESS_KEY_ID` etc. for 
> every possible storage-related setting sounds unreasonable.
>
> (This is the problem I’m facing right now with one of my libraries.)
>
> 3) The standard pattern for working around these problems is 
> boilerplate-ish:
>
> my_config = {foo: bar}
>
> class ConfiguredStorageClass(GenericStorageClass):
> def __init__(self, *args, **kwargs):
> kwargs.update(my_config)
> super().__init__(*args, **kwargs)
>
> DEFAULT_FILE_STORAGE = 'path.to.ConfiguredStorageClass'
>
>
> ** Proposed solution **
>
> To solve this problem, I would like the DEFAULT_FILE_STORAGE and 
> STATICFILES_STORAGE settings to accept an additional format: a 2-uple of 
> (dotted Python path to class, init_kwargs).
>
> This would allow simplifying the example above to:
>
> DEFAULT_FILE_STORAGE = ‘path.to.GenericStorageClass’, {foo: bar}
>
>
> ** Variants **
>
> We could go a bit further support 2-uples with args, 2-uples with kwargs, 
> and 3-uples with args and kwargs. I didn’t propose it because I’m not sure 
> this possibility adds much value. Arguments can be passed as kwargs even if 
> the init method expects them positionally.
>
> We could support setting DEFAULT_FILE_STORAGE and STATICFILES_STORAGE to 
> an already initialized instance of a storage class. I’m against this idea 
> because settings should remain primitive Python values whenever possible.
>
> We could introduce DEFAULT_FILE_STORAGE_INIT_KWARGS and 
> STATICFILES_STORAGE_INIT_KWARGS. Well. Perhaps not :-)
>
>
> What do you think?
>
> -- 
> Aymeric.
>
>
>
>

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Re: Provide a way to pass kwargs when initializing the storage class

2015-11-07 Thread charettes
I think the proposed approach makes sense.

I don't think we need to support any variant to pass the configuration 
values as args. All the existing storage backends have to make their 
argument optionals anyway now to support how they are currently initialized.

Requiring a dict makes it also more explicit about what values actually 
mean and support both cases.

Simon

Le samedi 7 novembre 2015 12:16:05 UTC+1, Aymeric Augustin a écrit :
>
> Hello,
>
> Currently the DEFAULT_FILE_STORAGE and STATICFILES_STORAGE settings 
> contain a dotted Python path to the storage class. The class is 
> instantiated without any arguments.
>
>
> ** Problem **
>
> This leads to three annoyances.
>
> 1) Third-party libraries like django-storages(-redux) need to provide a 
> setting for every value that could be required to configure the storage. 
> This additional level of indirection is annoying.
>
> If you’re skeptical, look at 
> https://github.com/jschneier/django-storages/blob/f2880b16b57a36b241a54932255e1a852c0e0ac7/storages/backends/s3boto.py#L204
> .
>
> 2) Compounding this problem, third-party libraries that want to use a 
> Django storage backend, but likely not the default one, have no convenient 
> way for the user to configure the storage.
>
> Having settings such as `MY_THIRD_PARTY_APP__AWS_ACCESS_KEY_ID` etc. for 
> every possible storage-related setting sounds unreasonable.
>
> (This is the problem I’m facing right now with one of my libraries.)
>
> 3) The standard pattern for working around these problems is 
> boilerplate-ish:
>
> my_config = {foo: bar}
>
> class ConfiguredStorageClass(GenericStorageClass):
> def __init__(self, *args, **kwargs):
> kwargs.update(my_config)
> super().__init__(*args, **kwargs)
>
> DEFAULT_FILE_STORAGE = 'path.to.ConfiguredStorageClass'
>
>
> ** Proposed solution **
>
> To solve this problem, I would like the DEFAULT_FILE_STORAGE and 
> STATICFILES_STORAGE settings to accept an additional format: a 2-uple of 
> (dotted Python path to class, init_kwargs).
>
> This would allow simplifying the example above to:
>
> DEFAULT_FILE_STORAGE = ‘path.to.GenericStorageClass’, {foo: bar}
>
>
> ** Variants **
>
> We could go a bit further support 2-uples with args, 2-uples with kwargs, 
> and 3-uples with args and kwargs. I didn’t propose it because I’m not sure 
> this possibility adds much value. Arguments can be passed as kwargs even if 
> the init method expects them positionally.
>
> We could support setting DEFAULT_FILE_STORAGE and STATICFILES_STORAGE to 
> an already initialized instance of a storage class. I’m against this idea 
> because settings should remain primitive Python values whenever possible.
>
> We could introduce DEFAULT_FILE_STORAGE_INIT_KWARGS and 
> STATICFILES_STORAGE_INIT_KWARGS. Well. Perhaps not :-)
>
>
> What do you think?
>
> -- 
> Aymeric.
>
>
>
>

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Re: Provide a way to pass kwargs when initializing the storage class

2015-11-07 Thread Collin Anderson
Ooooh. I think I like it. The syntax could be a bit confusing, but I think 
I like it. :)

On Saturday, November 7, 2015 at 12:16:05 PM UTC+1, Aymeric Augustin wrote:
>
> Hello,
>
> Currently the DEFAULT_FILE_STORAGE and STATICFILES_STORAGE settings 
> contain a dotted Python path to the storage class. The class is 
> instantiated without any arguments.
>
>
> ** Problem **
>
> This leads to three annoyances.
>
> 1) Third-party libraries like django-storages(-redux) need to provide a 
> setting for every value that could be required to configure the storage. 
> This additional level of indirection is annoying.
>
> If you’re skeptical, look at 
> https://github.com/jschneier/django-storages/blob/f2880b16b57a36b241a54932255e1a852c0e0ac7/storages/backends/s3boto.py#L204
> .
>
> 2) Compounding this problem, third-party libraries that want to use a 
> Django storage backend, but likely not the default one, have no convenient 
> way for the user to configure the storage.
>
> Having settings such as `MY_THIRD_PARTY_APP__AWS_ACCESS_KEY_ID` etc. for 
> every possible storage-related setting sounds unreasonable.
>
> (This is the problem I’m facing right now with one of my libraries.)
>
> 3) The standard pattern for working around these problems is 
> boilerplate-ish:
>
> my_config = {foo: bar}
>
> class ConfiguredStorageClass(GenericStorageClass):
> def __init__(self, *args, **kwargs):
> kwargs.update(my_config)
> super().__init__(*args, **kwargs)
>
> DEFAULT_FILE_STORAGE = 'path.to.ConfiguredStorageClass'
>
>
> ** Proposed solution **
>
> To solve this problem, I would like the DEFAULT_FILE_STORAGE and 
> STATICFILES_STORAGE settings to accept an additional format: a 2-uple of 
> (dotted Python path to class, init_kwargs).
>
> This would allow simplifying the example above to:
>
> DEFAULT_FILE_STORAGE = ‘path.to.GenericStorageClass’, {foo: bar}
>
>
> ** Variants **
>
> We could go a bit further support 2-uples with args, 2-uples with kwargs, 
> and 3-uples with args and kwargs. I didn’t propose it because I’m not sure 
> this possibility adds much value. Arguments can be passed as kwargs even if 
> the init method expects them positionally.
>
> We could support setting DEFAULT_FILE_STORAGE and STATICFILES_STORAGE to 
> an already initialized instance of a storage class. I’m against this idea 
> because settings should remain primitive Python values whenever possible.
>
> We could introduce DEFAULT_FILE_STORAGE_INIT_KWARGS and 
> STATICFILES_STORAGE_INIT_KWARGS. Well. Perhaps not :-)
>
>
> What do you think?
>
> -- 
> Aymeric.
>
>
>
>

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Provide a way to pass kwargs when initializing the storage class

2015-11-07 Thread Aymeric Augustin
Hello,

Currently the DEFAULT_FILE_STORAGE and STATICFILES_STORAGE settings contain a 
dotted Python path to the storage class. The class is instantiated without any 
arguments.


** Problem **

This leads to three annoyances.

1) Third-party libraries like django-storages(-redux) need to provide a setting 
for every value that could be required to configure the storage. This 
additional level of indirection is annoying.

If you’re skeptical, look at 
https://github.com/jschneier/django-storages/blob/f2880b16b57a36b241a54932255e1a852c0e0ac7/storages/backends/s3boto.py#L204
 
.

2) Compounding this problem, third-party libraries that want to use a Django 
storage backend, but likely not the default one, have no convenient way for the 
user to configure the storage.

Having settings such as `MY_THIRD_PARTY_APP__AWS_ACCESS_KEY_ID` etc. for every 
possible storage-related setting sounds unreasonable.

(This is the problem I’m facing right now with one of my libraries.)

3) The standard pattern for working around these problems is boilerplate-ish:

my_config = {foo: bar}

class ConfiguredStorageClass(GenericStorageClass):
def __init__(self, *args, **kwargs):
kwargs.update(my_config)
super().__init__(*args, **kwargs)

DEFAULT_FILE_STORAGE = 'path.to.ConfiguredStorageClass'


** Proposed solution **

To solve this problem, I would like the DEFAULT_FILE_STORAGE and 
STATICFILES_STORAGE settings to accept an additional format: a 2-uple of 
(dotted Python path to class, init_kwargs).

This would allow simplifying the example above to:

DEFAULT_FILE_STORAGE = ‘path.to.GenericStorageClass’, {foo: bar}


** Variants **

We could go a bit further support 2-uples with args, 2-uples with kwargs, and 
3-uples with args and kwargs. I didn’t propose it because I’m not sure this 
possibility adds much value. Arguments can be passed as kwargs even if the init 
method expects them positionally.

We could support setting DEFAULT_FILE_STORAGE and STATICFILES_STORAGE to an 
already initialized instance of a storage class. I’m against this idea because 
settings should remain primitive Python values whenever possible.

We could introduce DEFAULT_FILE_STORAGE_INIT_KWARGS and 
STATICFILES_STORAGE_INIT_KWARGS. Well. Perhaps not :-)


What do you think?

-- 
Aymeric.



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