snf-stats-app: Add support for configurable URLs

snf-stats-app/conf/20-snf-stats-app-settings.conf

 ## -*- coding: utf-8 -*-
 ##
+## Top-level URL for deployment.
+#STATS_BASE_URL = "https://host:port/stats"
+#
 ## Image properties
 #IMAGE_WIDTH = 210
 #WIDTH = 68

snf-stats-app/setup.py

@@ -58,6 +58,7 @@ INSTALL_REQUIRES = [
     'gdmodule',
     'py-rrdtool',
     'Django>=1.2, <1.3',
+    'snf-django-lib',
 ]
 
 setup(

snf-stats-app/synnefo_stats/stats_settings.py

+from django.conf import settings
+from synnefo.lib import parse_base_url
+
+BASE_URL = getattr(settings, 'STATS_BASE_URL',
+                   'https://stats.example.synnefo.org/stats/')
+BASE_HOST, BASE_PATH = parse_base_url(BASE_URL)

snf-stats-app/synnefo_stats/urls.py

@@ -31,9 +31,15 @@
 # interpreted as representing official policies, either expressed
 # or implied, of GRNET S.A.
 
-from django.conf.urls.defaults import patterns
+from django.conf.urls.defaults import patterns, include
+from snf_django.lib.api.utils import prefix_pattern
+from synnefo_stats.stats_settings import BASE_PATH
 from synnefo_stats.grapher import grapher
 
+stats_patterns = patterns('',
+    (r'^(?P<hostname>\S+)/(?P<graph_type>\S+)/$', grapher),
+)
+
 urlpatterns = patterns('',
-    (r'^stats/(?P<hostname>\S+)/(?P<graph_type>\S+)/$', grapher),
+    (prefix_pattern(BASE_PATH), include(stats_patterns)),
 )