How to setup django-compressor on heroku, offline compression to S3 - django

Question

I followed every QA suggestions found on SO and in different blogs, Everything works ok on my dev machine and nothing works on heroku.
here are my settings:
DEFAULT_FILE_STORAGE = 'arena.utils.MediaRootS3BotoStorage' # media files
# storage
AWS_ACCESS_KEY_ID = os.environ.get('AWS_ACCESS_KEY_ID')
AWS_SECRET_ACCESS_KEY = os.environ.get('AWS_SECRET_ACCESS_KEY')
AWS_STORAGE_BUCKET_NAME = os.environ.get('AWS_STORAGE_BUCKET_NAME')
AWS_PRELOAD_METADATA = True # necessary to fix manage.py collectstatic command to only upload changed files instead of all files
S3_URL = 'https://%s.s3.amazonaws.com' % AWS_STORAGE_BUCKET_NAME
MEDIA_URL = S3_URL + '/media/'
STATIC_URL = S3_URL + '/static/'
ADMIN_MEDIA_PREFIX = STATIC_URL + 'admin/'
COMPRESS_URL = STATIC_URL
COMPRESS_OFFLINE = True
COMPRESS_STORAGE = 'utils.CachedS3BotoStorage'
STATICFILES_STORAGE = COMPRESS_STORAGE
When i run collectstatic/compress everything is ok, i see the files being collected to S3 and put in proper places. I see the manifest file.
Loading any page with compressor tag, show an error OfflineGenerationError: You have offline compression enabled but key "d2a53169c44dec41ce3ee7da19b2b9d4" is missing from offline manifest. Running python manage.py compress again solves nothing. when i check the manifest file, indeed the key it looks for doesn't exist.
What is going wrong here?
Question i already checked:
How to configure django-compressor and django-staticfiles with Amazon's S3?
Django Compressor with S3 URL Heroku
Configuring django-compressor with remote storage (django-storage - amazon s3)

Answer 1

On my side I have very similar config, and I'm successfully using compressor for more than 2 years.
settings.py
COMPRESS_STORAGE = 'MyAwesomeApp.app.CachedS3BotoStorage.CachedS3BotoStorage'
AWS_ACCESS_KEY_ID = '#######'
AWS_SECRET_ACCESS_KEY = '########################+#########+BqoQ'
AWS_STORAGE_BUCKET_NAME = 'myAmazonS3cdn.myawesomewebsite.com'
AWS_S3_SECURE_URLS = False
AWS_QUERYSTRING_AUTH = False
COMPRESS_ROOT = 'MyAwesomeApp/static'
STATIC_ROOT = 'MyAwesomeApp/static/javascript'
COMPRESS_OUTPUT_DIR = 'compressed'
STATICFILES_STORAGE = COMPRESS_STORAGE
STATIC_URL = "http://myAmazonS3cdn.myawesomewebsite.com/"
COMPRESS_URL = STATIC_URL
COMPRESS_ENABLED = True
CachedS3BotoStorage.py
from django.core.files.storage import get_storage_class
from storages.backends.s3boto import S3BotoStorage
from django.core.files.base import File
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
I'm running python managep.py compress locally, and having manifest generated on my static files directory. Heroku only deals with the collecstatic and delivers the most recent manifest version to my cdn.
Regards,

Answer 2

I completed the above solution with some lines, to fix the problem that create many (multiples) manifest_%.json in Amazon S3
in setting.py:
STATICFILES_STORAGE = 'your_package.s3utils.CachedS3BotoStorage'
in s3utils.py:
from storages.backends.s3boto import S3BotoStorage
from django.core.files.storage import get_storage_class
class CachedS3BotoStorage(S3BotoStorage):
"""
S3 storage backend that saves the 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 url(self, name):
"""
Fix problem images admin Django S3 images
"""
url = super(CachedS3BotoStorage, self).url(name)
if name.endswith('/') and not url.endswith('/'):
url += '/'
return url
def save(self, name, content):
name = super(CachedS3BotoStorage, self).save(name, content)
self.local_storage._save(name, content)
return name
# HERE is secret to dont generating multiple manifest.json and to delete manifest.json in Amazon S3
def get_available_name(self, name):
if self.exists(name):
self.delete(name)
return name

Answer 3

I found a git repository that contains post_compile hooks to solve this problem. It runs compress after Heroku built the Django app (and also installs lessc if you need less in your compressor settings).
https://github.com/nigma/heroku-django-cookbook