Domain sharding on Django for media files

settings.py

# put storage.py in one off your apps or create a new one
DEFAULT_FILE_STORAGE = 'yourapp.storage.DomainShardingStorage'
# for easy_thumbnails
THUMBNAIL_DEFAULT_STORAGE = DEFAULT_FILE_STORAGE

SHARDED_MEDIA_DOMAINS_NUMBER = 2
SHARDED_MEDIA_URL_TEMPLATE = '/media/' if DEBUG else 'http://s{0}.afancycdn.com/media/'

storage.py

# Domain sharding on Django for media files
# credits to: https://github.com/coagulant/django-webperf

import hashlib, os

from django.utils.six.moves.urllib.parse import urljoin
from django.core.files.storage import FileSystemStorage
from django.utils.encoding import filepath_to_uri
from django.utils._os import abspathu
from django.conf import settings

class DomainShardingStorage(FileSystemStorage):
    """
    Standard filesystem storage with domain sharding for urls
    """
    def __init__(self, base_url=None, **kwargs):
        FileSystemStorage.__init__(self, base_url, **kwargs)

        if base_url is None:
            base_url = settings.SHARDED_MEDIA_URL_TEMPLATE
        elif not base_url.endswith('/'):
            base_url += '/'
        self.base_url = base_url

    def get_domain_number_for_uri(self, uri):
        md5 = hashlib.md5()
        md5.update(uri)
        integer_hash = int(md5.hexdigest(), 16)
        domain_number = integer_hash % settings.SHARDED_MEDIA_DOMAINS_NUMBER + 1
        return domain_number

    def url(self, name):
        if self.base_url is None:
            raise ValueError("This file is not accessible via a URL.")

        filepath = filepath_to_uri(name)
        domain_number = self.get_domain_number_for_uri(filepath)
        sharded_base_url = self.base_url.format(domain_number)
        return urljoin(sharded_base_url, filepath)