Configure Tower in Tower:

* Add separate Django app for configuration: awx.conf.
* Migrate from existing main.TowerSettings model to conf.Setting.
* Add settings wrapper to allow get/set/del via django.conf.settings.
* Update existing references to tower_settings to use django.conf.settings.
* Add a settings registry to allow for each Django app to register configurable settings.
* Support setting validation and conversion using Django REST Framework fields.
* Add /api/v1/settings/ to display a list of setting categories.
* Add /api/v1/settings/<slug>/ to display all settings in a category as a single object.
* Allow PUT/PATCH to update setting singleton, DELETE to reset to defaults.
* Add "all" category to display all settings across categories.
* Add "changed" category to display only settings configured in the database.
* Support per-user settings via "user" category (/api/v1/settings/user/).
* Support defaults for user settings via "user-defaults" category (/api/v1/settings/user-defaults/).
* Update serializer metadata to support category, category_slug and placeholder on OPTIONS responses.
* Update serializer metadata to handle child fields of a list/dict.
* Hide raw data form in browsable API for OPTIONS and DELETE.
* Combine existing licensing code into single "TaskEnhancer" class.
* Move license helper functions from awx.api.license into awx.conf.license.
* Update /api/v1/config/ to read/verify/update license using TaskEnhancer and settings wrapper.
* Add support for caching settings accessed via settings wrapper.
* Invalidate cached settings when Setting model changes or is deleted.
* Preload all database settings into cache on first access via settings wrapper.
* Add support for read-only settings than can update their value depending on other settings.
* Use setting_changed signal whenever a setting changes.
* Register configurable authentication, jobs, system and ui settings.
* Register configurable LDAP, RADIUS and social auth settings.
* Add custom fields and validators for URL, LDAP, RADIUS and social auth settings.
* Rewrite existing validator for Credential ssh_private_key to support validating private keys, certs or combinations of both.
* Get all unit/functional tests working with above changes.
* Add "migrate_to_database_settings" command to determine settings to be migrated into the database and comment them out when set in Python settings files.
* Add support for migrating license key from file to database.
* Remove database-configuable settings from local_settings.py example files.
* Update setup role to no longer install files for database-configurable settings.

f 94ff6ee More settings work.
f af4c4e0 Even more db settings stuff.
f 96ea9c0 More settings, attempt at singleton serializer for settings.
f 937c760 More work on singleton/category views in API, add code to comment out settings in Python files, work on command to migrate settings to database.
f 425b0d3 Minor fixes for sprint demo.
f ea402a4 Add support for read-only settings, cleanup license engine, get license support working with DB settings.
f ec289e4 Rename migration, minor fixmes, update setup role.
f 603640b Rewrite key/cert validator, finish adding social auth fields, hook up signals for setting_changed, use None to imply a setting is not set.
f 67d1b5a Get functional/unit tests passing.
f 2919b62 Flake8 fixes.
f e62f421 Add redbaron to requirements, get file to database migration working (except for license).
f c564508 Add support for migrating license file.
f 982f767 Add support for regex in social map fields.

awx/main/utils.py

@@ -97,14 +97,14 @@ class RequireDebugTrueOrTest(logging.Filter):
         return settings.DEBUG or 'test' in sys.argv
 
 
-def memoize(ttl=60):
+def memoize(ttl=60, cache_key=None):
     '''
     Decorator to wrap a function and cache its result.
     '''
     from django.core.cache import cache
 
     def _memoizer(f, *args, **kwargs):
-        key = slugify('%s %r %r' % (f.__name__, args, kwargs))
+        key = cache_key or slugify('%s %r %r' % (f.__name__, args, kwargs))
         value = cache.get(key)
         if value is None:
             value = f(*args, **kwargs)
@@ -475,6 +475,7 @@ def cache_list_capabilities(page, prefetch_list, model, user):
                 obj.capabilities_cache[display_method] = True
 
 
+@memoize()
 def get_system_task_capacity():
     '''
     Measure system memory and use it as a baseline for determining the system's capacity
@@ -550,8 +551,8 @@ def build_proot_temp_dir():
     '''
     Create a temporary directory for proot to use.
     '''
-    from awx.main.conf import tower_settings
-    path = tempfile.mkdtemp(prefix='ansible_tower_proot_', dir=tower_settings.AWX_PROOT_BASE_PATH)
+    from django.conf import settings
+    path = tempfile.mkdtemp(prefix='ansible_tower_proot_', dir=settings.AWX_PROOT_BASE_PATH)
     os.chmod(path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)
     return path
 
@@ -564,14 +565,13 @@ def wrap_args_with_proot(args, cwd, **kwargs):
      - /var/log/supervisor
      - /tmp (except for own tmp files)
     '''
-    from awx.main.conf import tower_settings
     from django.conf import settings
     new_args = [getattr(settings, 'AWX_PROOT_CMD', 'proot'), '-v',
                 str(getattr(settings, 'AWX_PROOT_VERBOSITY', '0')), '-r', '/']
     hide_paths = ['/etc/tower', '/var/lib/awx', '/var/log',
                   tempfile.gettempdir(), settings.PROJECTS_ROOT,
                   settings.JOBOUTPUT_ROOT]
-    hide_paths.extend(getattr(tower_settings, 'AWX_PROOT_HIDE_PATHS', None) or [])
+    hide_paths.extend(getattr(settings, 'AWX_PROOT_HIDE_PATHS', None) or [])
     for path in sorted(set(hide_paths)):
         if not os.path.exists(path):
             continue
@@ -591,7 +591,7 @@ def wrap_args_with_proot(args, cwd, **kwargs):
         show_paths.append(settings.ANSIBLE_VENV_PATH)
     if settings.TOWER_USE_VENV:
         show_paths.append(settings.TOWER_VENV_PATH)
-    show_paths.extend(getattr(tower_settings, 'AWX_PROOT_SHOW_PATHS', None) or [])
+    show_paths.extend(getattr(settings, 'AWX_PROOT_SHOW_PATHS', None) or [])
     for path in sorted(set(show_paths)):
         if not os.path.exists(path):
             continue