缩略图标签失败：（sorl-thumbnail 11.12）

Question

我一直在生产环境中使用sorl-thumbnail获取奇怪的错误（使用Sentry作为记录器）。他们都只是说Thumbnail tag failed:（这是非常有用的），它们都来自三个模块中的一个。

奇怪的是它实际上并不影响网站。页面加载正常，甚至缩略图加载正常。这真的只是一个问题，因为我已经厌倦了在我的Sentry仪表板中看到错误出现在我的列表中。但是，我无法确定错误产生的原因或解决方法。我开始怀疑它们是不仅仅是标准行为与过于冗长的日志记录相混合，因为就像我说的那样，对网站没有明显的影响。

也许这里的某个人可以更多地了解它，所以这里是堆栈跟踪。

更新＃1

对于来自sorl.thumbnail.engines.pil_engine._orientation的人，我找到了以下可能的候选人：http://blog.yawd.eu/2012/fix-sorlthumbnail-engines-pil-orientation-error/

来自sorl.thumbnail.images.deserialize_image_file：

Thumbnail tag failed:

Stacktrace (most recent call last):

  File "sorl/thumbnail/templatetags/thumbnail.py", line 49, in render
    logger.error('Thumbnail tag failed:', exc_info=sys.exc_info())

  File "sorl/thumbnail/templatetags/thumbnail.py", line 97, in _render
    file_, geometry, **options

  File "sorl/thumbnail/base.py", line 65, in get_thumbnail
    default.kvstore.get_or_set(source)

  File "sorl/thumbnail/kvstores/base.py", line 46, in get_or_set
    cached = self.get(image_file)

  File "sorl/thumbnail/kvstores/base.py", line 25, in get
    return self._get(image_file.key)

  File "sorl/thumbnail/kvstores/base.py", line 127, in _get
    return deserialize_image_file(value)

  File "sorl/thumbnail/images.py", line 31, in deserialize_image_file
    data = simplejson.loads(s)

  File "simplejson/__init__.py", line 428, in loads
    return _default_decoder.decode(s)

  File "simplejson/decoder.py", line 402, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())

  File "simplejson/decoder.py", line 420, in raw_decode
    raise JSONDecodeError("No JSON object could be decoded", s, idx)

来自sorl.thumbnail.images.read：

Thumbnail tag failed:

Stacktrace (most recent call last):

  File "sorl/thumbnail/templatetags/thumbnail.py", line 49, in render
    logger.error('Thumbnail tag failed:', exc_info=sys.exc_info())

  File "sorl/thumbnail/templatetags/thumbnail.py", line 97, in _render
    file_, geometry, **options

  File "sorl/thumbnail/base.py", line 56, in get_thumbnail
    source_image = default.engine.get_image(source)

  File "sorl/thumbnail/engines/pil_engine.py", line 12, in get_image
    buf = StringIO(source.read())

  File "sorl/thumbnail/images.py", line 121, in read
    return self.storage.open(self.name).read()

  File "django/core/files/storage.py", line 33, in open
    file = self._open(name, mode)

  File "django/core/files/storage.py", line 159, in _open
    return File(open(self.path(name), mode))

来自sorl.thumbnail.engines.pil_engine._orientation：

Thumbnail tag failed:

Stacktrace (most recent call last):

  File "sorl/thumbnail/templatetags/thumbnail.py", line 49, in render
    logger.error('Thumbnail tag failed:', exc_info=sys.exc_info())

  File "sorl/thumbnail/templatetags/thumbnail.py", line 97, in _render
    file_, geometry, **options

  File "sorl/thumbnail/base.py", line 61, in get_thumbnail
    thumbnail)

  File "sorl/thumbnail/base.py", line 86, in _create_thumbnail
    image = default.engine.create(source_image, geometry, options)

  File "sorl/thumbnail/engines/base.py", line 15, in create
    image = self.orientation(image, geometry, options)

  File "sorl/thumbnail/engines/base.py", line 26, in orientation
    return self._orientation(image)

  File "sorl/thumbnail/engines/pil_engine.py", line 31, in _orientation
    exif = None

  File "PIL/JpegImagePlugin.py", line 381, in _getexif
    info.load(file)

  File "PIL/TiffImagePlugin.py", line 382, in load
    raise IOError, "not enough data"

Answer 1

我在本地工作时遇到了这个问题。在运行管理命令后，它似乎停止了：

python manage.py thumbnail clear

接着是

python manage.py thumbnail cleanup