Add heartbeat to cms

common/djangoapps/heartbeat/urls.py

@@ -0,0 +1,5 @@
+from django.conf.urls import *
+
+urlpatterns = patterns('',
+    url(r'^$', 'heartbeat.views.heartbeat', name='heartbeat'),
+)

common/djangoapps/heartbeat/views.py

@@ -0,0 +1,15 @@
+import json
+from datetime import datetime
+from django.http import HttpResponse
+from xmodule.modulestore.django import modulestore
+
+
+def heartbeat(request):
+    """
+    Simple view that a loadbalancer can check to verify that the app is up
+    """
+    output = {
+        'date': datetime.now().isoformat(),
+        'courses': [course.location.url() for course in modulestore().get_courses()],
+    }
+    return HttpResponse(json.dumps(output, indent=4))