Add facilities for subordinate charms to affect dashboard settings

hooks/horizon_contexts.py

@@ -172,3 +172,22 @@ class RouterSettingContext(OSContextGenerator):
             'disable_router': False if config('profile') in ['cisco'] else True
         }
         return ctxt
+
+
+class LocalSettingsContext(OSContextGenerator):
+    def __call__(self):
+        ''' Additional config stanzas to be appended to local_settings.py '''
+        
+        settings = []
+        
+        for rid in relation_ids("settings"):
+            for unit in related_units(rid):
+                rdata = relation_get(unit=unit, rid=rid)
+                if 'setting' in rdata:
+                    settings.append('# {0}/{1}\n{2}'.format(
+                        rid, unit, rdata['setting'])
+                    )
+        ctxt = {
+            'settings': settings
+        }
+        return ctxt

hooks/horizon_hooks.py

@@ -244,6 +244,17 @@ def update_nrpe_config():
     nrpe_setup.write()
 
 
+@hooks.hook('settings-relation-joined')
+def settings_relation_joined():
+    relation_set(release=os_release("openstack-dashboard"))
+
+
+@hooks.hook('settings-relation-changed')
+@restart_on_change(restart_map())
+def update_plugin_config():
+    CONFIGS.write(LOCAL_SETTINGS)
+
+
 def main():
     try:
         hooks.execute(sys.argv)

hooks/horizon_utils.py

@@ -89,7 +89,8 @@ CONFIG_FILES = OrderedDict([
     (LOCAL_SETTINGS, {
         'hook_contexts': [horizon_contexts.HorizonContext(),
                           horizon_contexts.IdentityServiceContext(),
-                          context.SyslogContext()],
+                          context.SyslogContext(),
+                          horizon_contexts.LocalSettingsContext()],
         'services': ['apache2']
     }),
     (APACHE_CONF, {

hooks/settings-relation-changed

@@ -0,0 +1 @@
+horizon_hooks.py

hooks/settings-relation-joined

@@ -0,0 +1 @@
+horizon_hooks.py

metadata.yaml

@@ -17,6 +17,9 @@ requires:
   ha:
     interface: hacluster
     scope: container
+  settings:
+    interface: openstack-dashboard-settings
+    scope: container
 peers:
   cluster:
     interface: openstack-dashboard-ha

templates/essex/local_settings.py

@@ -118,3 +118,5 @@ LOGGING = {
             }
         }
 }
+
+{{ settings|join('\n\n') }}

templates/folsom/local_settings.py

@@ -167,3 +167,5 @@ LOGIN_REDIRECT_URL='{{ webroot }}'
 # offline compression by default.  To enable online compression, install
 # the node-less package and enable the following option.
 COMPRESS_OFFLINE = {{ compress_offline }}
+
+{{ settings|join('\n\n') }}

templates/grizzly/local_settings.py

@@ -263,3 +263,5 @@ LOGGING = {
         }
     }
 }
+
+{{ settings|join('\n\n') }}

templates/havana/local_settings.py

@@ -483,3 +483,5 @@ COMPRESS_OFFLINE = {{ compress_offline }}
 # installations should have this set accordingly.  For more information
 # see https://docs.djangoproject.com/en/dev/ref/settings/.
 ALLOWED_HOSTS = '*'
+
+{{ settings|join('\n\n') }}

templates/icehouse/local_settings.py

@@ -514,3 +514,5 @@ COMPRESS_OFFLINE = {{ compress_offline }}
 # installations should have this set accordingly.  For more information
 # see https://docs.djangoproject.com/en/dev/ref/settings/.
 ALLOWED_HOSTS = '*'
+
+{{ settings|join('\n\n') }}

templates/juno/local_settings.py

@@ -619,3 +619,5 @@ LOGIN_REDIRECT_URL='{{ webroot }}'
 # installations should have this set accordingly.  For more information
 # see https://docs.djangoproject.com/en/dev/ref/settings/.
 ALLOWED_HOSTS = '*'
+
+{{ settings|join('\n\n') }}