Add healthz endpoint for health checks

news/views.py

@@ -3,9 +3,10 @@
 from time import time
 
 from django.conf import settings
+from django.http import HttpResponse
 from django.shortcuts import render
 from django.utils.encoding import force_unicode
-from django.views.decorators.cache import cache_control, never_cache
+from django.views.decorators.cache import cache_page, never_cache
 from django.views.decorators.csrf import csrf_exempt
 from django.views.decorators.http import require_POST, require_safe
 
@@ -508,11 +509,10 @@ def custom_update_phonebook(request, token):
 
 # Get data about current newsletters
 @require_safe
-@cache_control(max_age=300)
+@cache_page(300)
 def newsletters(request):
     # Get the newsletters as a dictionary of dictionaries that are
     # easily jsonified
-
     result = {}
     for newsletter in Newsletter.objects.all().values():
         newsletter['languages'] = newsletter['languages'].split(",")
@@ -526,6 +526,15 @@ def newsletters(request):
     })
 
 
+@require_safe
+@cache_page(10)
+def healthz(request):
+    """for use with healthchecks. wrapped with `cache_page` to test redis cache."""
+    # here to make sure DB is working
+    assert Newsletter.objects.exists(), 'no newsletters exist'
+    return HttpResponse('OK')
+
+
 @never_cache
 def lookup_user(request):
     """Lookup a user in Exact Target given email or token (not both).
@@ -610,7 +619,7 @@ def lookup_user(request):
 
 
 @require_safe
-@cache_control(max_age=300)
+@cache_page(300)
 def list_newsletters(request):
     """
     Public web page listing currently active newsletters.

urls.py

@@ -3,11 +3,14 @@
 from django.contrib import admin
 from django.views.generic import RedirectView
 
+from news.views import healthz
+
 
 home_redirect = '/admin/' if settings.ADMIN_ONLY_MODE else 'https://www.mozilla.org/'
 
 urlpatterns = [
-    url(r'^$', RedirectView.as_view(url=home_redirect))
+    url(r'^$', RedirectView.as_view(url=home_redirect)),
+    url('^healthz/$', healthz, name='healthz'),
 ]
 
 if not settings.ADMIN_ONLY_MODE: