Keystone API endpoint discovery

Implements: blueprint Web ui should use keystone to discover api endpoint

Change-Id: I5caec5aff2f5d11d11a08c141e7536118d38bd65

README.rst

@@ -21,18 +21,35 @@ To install the horizon web ui you need to do the following::
 
     # /opt/stack/horizon/tools/with_venv.sh pip install parsedatetime
 
-    # In horizons local_settings.py add the variable FREEZER_API_URL and set it
-      to the url of the freezer api server. Example:
-
-        FREEZER_API_URL = 'http://127.0.0.1:9090'
-
     # cd /opt/stack/horizon/
 
     # ./run_tests.sh --runserver 0.0.0.0:8000
 
 
-Now a new Tab is available in the dashboard lists on the left, called "Backup
-Restore DR".
+Now a new Tab is available in the dashboard lists on the left, called "Disaster Recovery".
+
+API registration
+================
+keystone user-create --name freezer --pass <pass>
+keystone user-role-add --user freezer --tenant service --role admin
+
+keystone service-create --name Freezer \
+  --type "Disaster Recovery" \
+  --description "Disaster Recovery"
+
+keystone endpoint-create \
+  --service-id <service-id> \
+  --publicurl <api-url> \
+  --internalurl <api-url> \
+  --adminurl <api-url> \
+  --region regionOne
+
+If keystone service-create and endpoint-create are not available you can set as a fallback the following on::
+
+    # vim /opt/stack/horizon/openstack_dashboard/local/local_settings.py
+
+    # add FREEZER_API_URL = http://<api_url>:<port>
+
 
 Running the unit tests
 ======================

freezer_ui/api/api.py

@@ -16,7 +16,6 @@
 
 from django.conf import settings
 import warnings
-
 import freezer.apiclient.client
 
 from horizon.utils import functions as utils
@@ -95,15 +94,35 @@ class ConfigClient(object):
         self.last_backup = last_backup
 
 
+@memoized
+def get_service_url(request):
+    """ Get Freezer API url from keystone catalog.
+    if Freezer is not set in keystone, the fallback will be
+    'FREEZER_API_URL' in local_settings.py
+    """
+    url = None
+
+    catalog = (getattr(request.user, "service_catalog", None))
+    if not catalog:
+        warnings.warn('Using hardcoded FREEZER_API_URL at {0}'
+                      .format(settings.FREEZER_API_URL))
+        return getattr(settings, 'FREEZER_API_URL', None)
+
+    for c in catalog:
+        if c['name'] == 'Freezer':
+            for e in c['endpoints']:
+                url = e['publicURL']
+    return url
+
+
 @memoized
 def _freezerclient(request):
-    warnings.warn('Endpoint discovery not implemented yet. Using hard-coded: {'
-                  '}'.format(settings.FREEZER_API_URL))
+    api_url = get_service_url(request)
 
     return freezer.apiclient.client.Client(
         token=request.user.token.id,
         auth_url=getattr(settings, 'OPENSTACK_KEYSTONE_URL'),
-        endpoint=settings.FREEZER_API_URL)
+        endpoint=api_url)
 
 
 def configuration_create(request, name=None, container_name=None,