Make the default compressor storage a lazy object to not load the storage class on module level.

compressor/base.py

@@ -1,18 +1,14 @@
 import os
 
-
 from django.conf import settings as django_settings
 from django.template.loader import render_to_string
 from django.core.files.base import ContentFile
-from django.core.files.storage import get_storage_class
 
 from compressor.conf import settings
 from compressor import filters
 from compressor.exceptions import UncompressableFileError
 from compressor.utils import get_hexdigest, get_mtime, get_class
 
-STORAGE = get_storage_class(settings.STORAGE)()
-
 class Compressor(object):
 
     def __init__(self, content, output_prefix="compressed"):
@@ -57,7 +53,8 @@ class Compressor(object):
 
     @property
     def storage(self):
-        return STORAGE
+        from compressor.storage import default_storage
+        return default_storage
 
     @property
     def hunks(self):

compressor/storage.py

@@ -1,5 +1,6 @@
 from django.core.files.storage import FileSystemStorage
 from django.core.files.storage import get_storage_class
+from django.utils.functional import LazyObject
 
 from compressor.conf import settings
 
@@ -18,3 +19,9 @@ class CompressorFileStorage(FileSystemStorage):
             base_url = settings.MEDIA_URL
         super(CompressorFileStorage, self).__init__(location, base_url,
                                                     *args, **kwargs)
+
+class DefaultStorage(LazyObject):
+    def _setup(self):
+        self._wrapped = get_storage_class(settings.STORAGE)()
+
+default_storage = DefaultStorage()

tests/core/tests.py

@@ -1,17 +1,18 @@
-import os, re
+import os
+import re
 import gzip
+from BeautifulSoup import BeautifulSoup
 
 from django.template import Template, Context, TemplateSyntaxError
 from django.test import TestCase
-from compressor import CssCompressor, JsCompressor
+from django.core.files.storage import get_storage_class
+from django.conf import settings as django_settings
+
+from compressor import CssCompressor, JsCompressor, storage
 from compressor.conf import settings
 from compressor.storage import CompressorFileStorage
 from compressor.utils import get_hexdigest, get_mtime
 
-from django.conf import settings as django_settings
-
-from BeautifulSoup import BeautifulSoup
-
 
 class CompressorTestCase(TestCase):
 
@@ -332,12 +333,12 @@ class TestStorage(CompressorFileStorage):
 
 class StorageTestCase(TestCase):
     def setUp(self):
-        self._storage = settings.STORAGE
+        self._storage = storage.default_storage
-        settings.STORAGE = 'core.tests.TestStorage'
+        storage.default_storage = get_storage_class('core.tests.TestStorage')()
         settings.COMPRESS = True
 
     def tearDown(self):
-        settings.STORAGE = self._storage
+        storage.default_storage = self._storage
 
     def test_css_tag_with_storage(self):
         template = u"""{% load compress %}{% compress css %}