Django AWS S3 using Boto with Compressor fails to compress UncompressableFileError

Question

Following this guide, and these [1] [2] posts, I have tried to setup static storage on AWS S3 using django-storages Boto.

When executing collectstatic, the command succesfully collects at the STATIC_ROOT. However, the files are not uploaded to S3 compressed, and the server can't serve them. A 500 error is returned. Looking at the logs:

Error Message:

UncompressableFileError: 'https://<myapp>.s3.amazonaws.com/static/oscar/css/styles.css' could not be found in the COMPRESS_ROOT '/var/www/<myappname>/static' or with staticfiles.

EDIT:

I also changed STATIC_URL to http://%s/ % AWS_S3_CUSTOM_DOMAIN, and I get the same error, except that it is still searching at https, but the COMPRESS_URL is http.

UncompressableFileError: 'https://<myappname>.s3.amazonaws.com/static/oscar/css/styles.css' isn't accessible via COMPRESS_URL ('http://<myappname>.s3.amazonaws.com/') and can't be compressed

Is this an incompatibility with compressor and Boto?

relevant Code:

# settings/prod.py

AWS_ACCESS_KEY_ID = <Key_ID>
AWS_SECRET_ACCESS_KEY = <Secret_Key>
AWS_STORAGE_BUCKET_NAME = "<my_bucket_name>"
AWS_S3_CUSTOM_DOMAIN = "%s.s3.amazonaws.com" % AWS_STORAGE_BUCKET_NAME
STATIC_URL = "https://%s/" % AWS_S3_CUSTOM_DOMAIN
AWS_LOCATION = 'static'

DEFAULT_FILE_STORAGE = "storages.backends.s3boto.S3BotoStorage"
STATICFILES_STORAGE = "myapp.storage.s3utils.CachedS3BotoStorage"

COMPRESS_STORAGE = "myapp.storage.s3utils.CachedS3BotoStorage"
AWS_IS_GZIPPED = True
COMPRESS_URL = STATIC_URL
STATIC_ROOT = "/var/www/<myappname>/static/"
COMPRESS_ROOT = STATIC_ROOT

storage/s3utils.py from this documentation

from django.core.files.storage import get_storage_class
from storages.backends.s3boto import S3BotoStorage

class CachedS3BotoStorage(S3BotoStorage):
    """
    S3 storage backend that saves the files locally, too.
    """
    def __init__(self, *args, **kwargs):
        super(CachedS3BotoStorage, self).__init__(*args, **kwargs)
        self.local_storage = get_storage_class(
            "compressor.storage.CompressorFileStorage")()

    def save(self, name, content):
        name = super(CachedS3BotoStorage, self).save(name, content)
        self.local_storage._save(name, content)
        return name

Answer 1

Solved with these settings:

AWS_ACCESS_KEY_ID = '<KEY_ID>'
AWS_SECRET_ACCESS_KEY = '<SECRET_KEY>'
AWS_STORAGE_BUCKET_NAME = "<app_name>"
AWS_S3_CUSTOM_DOMAIN = "s3.amazonaws.com/%s" % AWS_STORAGE_BUCKET_NAME

MEDIA_URL = "https://%s/media/" % AWS_S3_CUSTOM_DOMAIN
STATIC_URL = "https://%s/static/" % AWS_S3_CUSTOM_DOMAIN
COMPRESS_URL = STATIC_URL

DEFAULT_FILE_STORAGE = '<app_name>.storage.s3utils.MediaS3BotoStorage'
STATICFILES_STORAGE = '<app_name>.storage.s3utils.CachedS3BotoStorage'
COMPRESS_STORAGE = '<app_name>.storage.s3utils.CachedS3BotoStorage'


MEDIA_ROOT = '<app_name>/media/'
STATIC_ROOT = '<app_name>/static/'
COMPRESS_ROOT = STATIC_ROOT


COMPRESS_ENABLED = True
COMPRESS_CSS_FILTERS = ['compressor.filters.css_default.CssAbsoluteFilter',
                        'compressor.filters.cssmin.CSSMinFilter'
                       ]
COMPRESS_PARSER = 'compressor.parser.HtmlParser'

STATICFILES_FINDERS = (
    'django.contrib.staticfiles.finders.FileSystemFinder',
    'django.contrib.staticfiles.finders.AppDirectoriesFinder',
    'compressor.finders.CompressorFinder'
)

and my s3utils.py

class CachedS3BotoStorage(S3BotoStorage):
    """
    S3 storage backend that saves files locally too. 
    """
    location = 'static'
    def __init__(self, *args, **kwargs):
        super(CachedS3BotoStorage, self).__init__(*args, **kwargs)
        self.local_storage = get_storage_class(
            "compressor.storage.CompressorFileStorage")()

    def save(self, name, content):
        name = super(CachedS3BotoStorage, self).save(name, content)
        self.local_storage._save(name, content)
        return name



class MediaS3BotoStorage(S3BotoStorage):
    """ S3 storage backend that saves to the 'media' subdirectory"""
    location = 'media'