Add config for using Redis as cache, add memoize function to store results in cache.

awx/api/license.py

@@ -4,6 +4,7 @@
 from rest_framework.exceptions import APIException
 
 from awx.main.task_engine import TaskSerializer
+from awx.main.utils import memoize
 
 
 class LicenseForbids(APIException):
@@ -11,6 +12,7 @@ class LicenseForbids(APIException):
     default_detail = 'Your Tower license does not allow that.'
 
 
+@memoize()
 def get_license(show_key=False, bypass_database=False):
     """Return a dictionary representing the license currently in
     place on this Tower instance.

awx/main/utils.py

@@ -16,9 +16,13 @@ import threading
 import contextlib
 import tempfile
 
+# Decorator
+from decorator import decorator
+
 # Django REST Framework
 from rest_framework.exceptions import ParseError, PermissionDenied
 from django.utils.encoding import smart_str
+from django.utils.text import slugify
 from django.core.urlresolvers import reverse
 from django.apps import apps
 
@@ -27,7 +31,7 @@ from Crypto.Cipher import AES
 
 logger = logging.getLogger('awx.main.utils')
 
-__all__ = ['get_object_or_400', 'get_object_or_403', 'camelcase_to_underscore',
+__all__ = ['get_object_or_400', 'get_object_or_403', 'camelcase_to_underscore', 'memoize',
            'get_ansible_version', 'get_ssh_version', 'get_awx_version', 'update_scm_url',
            'get_type_for_model', 'get_model_for_type', 'to_python_boolean',
            'ignore_inventory_computed_fields', 'ignore_inventory_group_removal',
@@ -93,6 +97,23 @@ class RequireDebugTrueOrTest(logging.Filter):
         return settings.DEBUG or 'test' in sys.argv
 
 
+def memoize(ttl=60):
+    '''
+    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))
+        value = cache.get(key)
+        if value is None:
+            value = f(*args, **kwargs)
+            cache.set(key, value, ttl)
+        return value
+    return decorator(_memoizer)
+
+
+@memoize()
 def get_ansible_version():
     '''
     Return Ansible version installed.
@@ -101,11 +122,11 @@ def get_ansible_version():
         proc = subprocess.Popen(['ansible', '--version'],
                                 stdout=subprocess.PIPE)
         result = proc.communicate()[0]
-        stripped_result = result.split('\n')[0].replace('ansible', '').strip()
-        return stripped_result
+        return result.split('\n')[0].replace('ansible', '').strip()
     except:
         return 'unknown'
 
+@memoize()
 def get_ssh_version():
     '''
     Return SSH version installed.
@@ -444,6 +465,7 @@ def ignore_inventory_group_removal():
     finally:
         _inventory_updates.is_removing = previous_value
 
+@memoize()
 def check_proot_installed():
     '''
     Check that proot is installed.

awx/settings/defaults.py

@@ -351,6 +351,14 @@ CELERYBEAT_SCHEDULE = {
     },
 }
 
+# Use Redis as cache backend.
+CACHES = {
+    'default': {
+        'BACKEND': 'redis_cache.RedisCache',
+        'LOCATION': BROKER_URL,
+    },
+}
+
 # Social Auth configuration.
 SOCIAL_AUTH_STRATEGY = 'social.strategies.django_strategy.DjangoStrategy'
 SOCIAL_AUTH_STORAGE = 'social.apps.django_app.default.models.DjangoStorage'

awx/settings/postprocess.py

@@ -32,3 +32,6 @@ if not all([SOCIAL_AUTH_SAML_SP_ENTITY_ID, SOCIAL_AUTH_SAML_SP_PUBLIC_CERT,
 
 if not AUTH_BASIC_ENABLED:
     REST_FRAMEWORK['DEFAULT_AUTHENTICATION_CLASSES'] = [x for x in REST_FRAMEWORK['DEFAULT_AUTHENTICATION_CLASSES'] if x != 'rest_framework.authentication.BasicAuthentication']
+
+# Update cache to use celery broker URL defined in configuration files.
+CACHES['default']['LOCATION'] = BROKER_URL

docs/licenses/django-redis-cache.txt

@@ -0,0 +1,24 @@
+Copyright (c) 2015 Sean Bleier
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+3. The name of the author may not be used to endorse or promote products
+   derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

requirements/requirements.txt

@@ -21,6 +21,7 @@ django-extensions==1.5.9
 git+https://github.com/chrismeyersfsu/django-jsonbfield@fix-sqlite_serialization#egg=jsonbfield
 django-polymorphic==0.7.2
 django-radius==1.0.0
+django-redis-cache==1.6.5
 djangorestframework==3.3.2
 djangorestframework-yaml==1.0.2
 django-split-settings==0.1.1