Added Django support.

optimize_later/__init__.py

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+# Make this usable as a Django application.
+default_app_config = 'optimize_later.apps.OptimizeLaterConfig'

optimize_later/apps.py

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+# For Django applications.
+import logging
+
+from django.apps import AppConfig
+from django.conf import settings
+from django.utils.module_loading import import_string
+
+from optimize_later import config
+
+log = logging.getLogger(__name__.rpartition('.')[0] or __name__)
+
+django_callbacks = []
+
+
+class OptimizeLaterConfig(AppConfig):
+    name = 'optimize_later'
+    verbose_name = 'Optimize Later'
+
+    def ready(self):
+        initialize_django_callbacks()
+
+
+def django_callback(result):
+    for callback in django_callbacks:
+        try:
+            callback(result)
+        except Exception:
+            log.exception('Failed to invoke Django callback: %r', callback)
+
+
+def initialize_django_callbacks():
+    global django_callbacks
+    django_callbacks = []
+    for callback in getattr(settings, 'OPTIMIZE_LATER_CALLBACKS', None) or []:
+        django_callbacks.append(import_string(callback))
+
+config.register_callback(django_callback)

testproject/manage.py

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+#!/usr/bin/env python
+import os
+import sys
+
+sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
+
+if __name__ == "__main__":
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "testproject.settings")
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError:
+        # The above import may fail for some other reason. Ensure that the
+        # issue is really that Django is missing to avoid masking other
+        # exceptions on Python 2.
+        try:
+            import django
+        except ImportError:
+            raise ImportError(
+                "Couldn't import Django. Are you sure it's installed and "
+                "available on your PYTHONPATH environment variable? Did you "
+                "forget to activate a virtual environment?"
+            )
+        raise
+    execute_from_command_line(sys.argv)

testproject/testapp/tests.py

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+import imp
+import sys
+import uuid
+
+from optimize_later.core import optimize_later, OptimizeReport
+
+try:
+    import django
+except ImportError:
+    pass
+else:
+    from django.test import TestCase
+    from optimize_later import apps
+
+
+    class DjangoCallbackTest(TestCase):
+        def make_module_path(self, function):
+            name = 'id_%s' % (uuid.uuid4().hex,)
+            module = imp.new_module(name)
+            module.function = function
+            sys.modules[name] = module
+            return '%s.function' % (name,)
+
+        def test_no_callbacks(self):
+            apps.initialize_django_callbacks()
+            self.assertEqual(apps.django_callbacks, [])
+
+        def test_callbacks(self):
+            reports = []
+            with self.settings(OPTIMIZE_LATER_CALLBACKS=[
+                self.make_module_path(reports.append),
+            ]):
+                apps.initialize_django_callbacks()
+                with optimize_later('test'):
+                    pass
+            self.assertEqual(len(reports), 1)
+            self.assertIsInstance(reports[0], OptimizeReport)

testproject/testproject/settings.py

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+"""
+Django settings for testproject project.
+
+Generated by 'django-admin startproject' using Django 1.11.2.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/1.11/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/1.11/ref/settings/
+"""
+
+import os
+
+# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
+BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+
+# Quick-start development settings - unsuitable for production
+# See https://docs.djangoproject.com/en/1.11/howto/deployment/checklist/
+
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = '5mhki6-)ki$7go#g2cblm7t$m2325z&chy=r#e8#)@b+reb=4u'
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = True
+
+ALLOWED_HOSTS = []
+
+
+# Application definition
+
+INSTALLED_APPS = [
+    'django.contrib.admin',
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'django.contrib.messages',
+    'django.contrib.staticfiles',
+    'optimize_later',
+    'testapp',
+]
+
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+]
+
+ROOT_URLCONF = 'testproject.urls'
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [],
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = 'testproject.wsgi.application'
+
+
+# Database
+# https://docs.djangoproject.com/en/1.11/ref/settings/#databases
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
+    }
+}
+
+
+# Password validation
+# https://docs.djangoproject.com/en/1.11/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+]
+
+
+# Internationalization
+# https://docs.djangoproject.com/en/1.11/topics/i18n/
+
+LANGUAGE_CODE = 'en-us'
+
+TIME_ZONE = 'UTC'
+
+USE_I18N = True
+
+USE_L10N = True
+
+USE_TZ = True
+
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/1.11/howto/static-files/
+
+STATIC_URL = '/static/'

testproject/testproject/urls.py

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+"""testproject URL Configuration
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/1.11/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  url(r'^$', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  url(r'^$', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.conf.urls import url, include
+    2. Add a URL to urlpatterns:  url(r'^blog/', include('blog.urls'))
+"""
+from django.conf.urls import url
+from django.contrib import admin
+
+urlpatterns = [
+    url(r'^admin/', admin.site.urls),
+]

testproject/testproject/wsgi.py

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+"""
+WSGI config for testproject project.
+
+It exposes the WSGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/1.11/howto/deployment/wsgi/
+"""
+
+import os
+
+from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "testproject.settings")
+
+application = get_wsgi_application()