检查sorl缩略图是否已经使用低级API缓存了图像 [英] Check if sorl thumbnail has already cached an image using the low level API

问题描述

索尔缩略图有一个低级API，可以让您做到这一点，例如：

Sorl thumbnail has a low-level API that allows you to do, for example:

from sorl.thumbnail import get_thumbnail
im = get_thumbnail(my_file, '100x100', crop='center', quality=99)

这将返回对缓存文件的引用。如果它已经被创建，它是超级快速。但是，如果必须首次创建它，则使用远程存储（如S3）可能需要很长时间。

This returns a reference to the cached file. If it's already been created, it's super quick. However, if it has to create it for the first time it can take a long time when using remote storage such as S3.

有没有办法运行命令Python（即不在模板中），以检查sorl是否会首次生成缩略图？

Is there a way to run a command in Python (ie. not in a template) to check if sorl will have to generate a thumbnail for the first time?

PS。我知道类似的问题此处，但这在模板上下文中提出了这个问题，并且使用了一个hacky解决方案作为使用自定义SQL而不是sorl API的答案。

PS. I'm aware of similar question here but this is asking about it in a template context, and has a hacky solution as an answer that uses custom SQL and not the sorl API.

推荐答案

p>在我的版本 sorl.thumbnail ， 11.12 ，方法 get_thumbnail 在sorl.thumbnail.base.py中定义，并启动如下：

In my version sorl.thumbnail, 11.12, the method get_thumbnail is defined in sorl.thumbnail.base.py and starts as follows:

def get_thumbnail(self, file_, geometry_string, **options):
    """..."""
    source = ImageFile(file_)
    for key, value in self.default_options.iteritems():
        options.setdefault(key, value)
    # ...
    for key, attr in self.extra_options:
        value = getattr(settings, attr)
        if value != getattr(default_settings, attr):
            options.setdefault(key, value)
    name = self._get_thumbnail_filename(source, geometry_string, options)
    thumbnail = ImageFile(name, default.storage)
    cached = default.kvstore.get(thumbnail)
    if cached:
        return cached
    if not thumbnail.exists():
        ...

如果您使用此代码并返回类似于

If you use this code and return something like

cached or thumbnail.exists()

这应该给你所需的结果。

this should give you the desired result.

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