only check preload_metadata if the storage class is boto

.gitignore

@@ -6,3 +6,5 @@
 *.egg-info
 /static/
 /static_root/
+build/
+dist/

collectfast/boto.py

@@ -1,8 +1,21 @@
 from . import settings
 
+try:
+    from storages.backends.s3boto import S3BotoStorage
+    from storages.backends.s3boto3 import S3Boto3Storage
+    has_boto = True
+except:
+    has_boto = False
+
 
 def is_boto3(storage):
-    return type(storage).__name__ == 'S3Boto3Storage'
+    return has_boto and isinstance(storage, S3Boto3Storage)
+
+
+def is_boto(storage):
+    return has_boto and (
+        isinstance(storage, S3BotoStorage) or
+        isinstance(storage, S3Boto3Storage))
 
 
 def reset_connection(storage):

collectfast/management/commands/collectstatic.py

@@ -6,7 +6,7 @@
 from django.utils.encoding import smart_str
 
 from collectfast.etag import should_copy_file
-from collectfast.boto import reset_connection
+from collectfast.boto import reset_connection, is_boto
 from collectfast import settings
 
 
@@ -32,7 +32,8 @@ def __init__(self, *args, **kwargs):
         self.tasks = []
         self.etags = {}
         self.collectfast_enabled = settings.enabled
-        if self.storage.preload_metadata is not True:
+
+        if is_boto(self.storage) and self.storage.preload_metadata is not True:
             self.storage.preload_metadata = True
             warnings.warn(
                 "Collectfast does not work properly without "

collectfast/tests/no_preload_metadata.py

@@ -0,0 +1,9 @@
+from storages.backends.s3boto3 import S3Boto3Storage
+
+
+class NPM(S3Boto3Storage):
+    """
+    Dummy class for testing that collectfast warns about overriding the
+    `preload_metadata` attriute.
+    """
+    preload_metadata = False

collectfast/tests/test_command.py

@@ -2,7 +2,7 @@
 
 from django.core.management import call_command
 from django.utils.six import StringIO
-from mock import patch
+from django.test import override_settings as override_django_settings
 
 from .utils import test, clean_static_dir, create_static_file, override_setting
 from .utils import with_bucket, override_storage_attr
@@ -42,9 +42,9 @@ def test_threads(case):
 
 @test
 @with_bucket
-@patch('django.contrib.staticfiles.management.commands.collectstatic.staticfiles_storage')  # noqa
-def test_warn_preload_metadata(case, mocked):
-    mocked.staticfiles_storage.return_value = False
+@override_django_settings(
+    STATICFILES_STORAGE="collectfast.tests.no_preload_metadata.NPM")
+def test_warn_preload_metadata(case):
     clean_static_dir()
     create_static_file()
     with warnings.catch_warnings(record=True) as w:
@@ -54,12 +54,22 @@ def test_warn_preload_metadata(case, mocked):
 
 
 @test
-@override_setting("enabled", False)
 @with_bucket
 def test_collectfast_disabled(case):
     clean_static_dir()
     create_static_file()
-    call_collectstatic()
+    result = call_collectstatic(disable_collectfast=True)
+    case.assertIn("1 static file copied.", result)
+
+
+@test
+@override_django_settings(
+    STATICFILES_STORAGE="django.contrib.staticfiles.storage.StaticFilesStorage")
+def test_collectfast_disabled_default_storage(case):
+    clean_static_dir()
+    create_static_file()
+    result = call_collectstatic(disable_collectfast=True)
+    case.assertIn("1 static file copied.", result)
 
 
 @test

collectfast/tests/utils.py

@@ -30,8 +30,7 @@ def with_bucket(func):
     @functools.wraps(func)
     @moto.mock_s3
     def wraps(*args, **kwargs):
-        boto.connect_s3().create_bucket(
-            django_settings.AWS_STORAGE_BUCKET_NAME)
+        boto.connect_s3().create_bucket(django_settings.AWS_STORAGE_BUCKET_NAME)
         return func(*args, **kwargs)
     return wraps