whitenoise fix

wsgi.py

import os
import sys

try:
    from importlib import import_module
except ImportError:
    from django.utils.importlib import import_module

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'graphite.settings')  # noqa

from django.conf import settings
from django.core.wsgi import get_wsgi_application
from graphite.logger import log

application = get_wsgi_application()

# whitenoise working only in python >= 2.7
if sys.version_info[0] >= 2 and sys.version_info[1] >= 7:
    try:
        from whitenoise.django import DjangoWhiteNoise
    except ImportError:
        pass
    else:
        application = DjangoWhiteNoise(application)
        prefix = "/".join((settings.URL_PREFIX.strip('/'), 'static'))
        for directory in settings.STATICFILES_DIRS:
            application.add_files(directory, prefix=prefix)
        for app_path in settings.INSTALLED_APPS:
            module = import_module(app_path)
            directory = os.path.join(os.path.dirname(module.__file__), 'static')
            if os.path.isdir(directory):
                application.add_files(directory, prefix=prefix)

# Initializing the search index can be very expensive. The import below
# ensures the index is preloaded before any requests are handed to the
# process.
log.info("graphite.wsgi - pid %d - reloading search index" % os.getpid())
import graphite.metrics.search  # noqa