Instead of caching homepage generally, cache data from Meetup with Django cache framework low-level api

Author: estebistec

pythonkc_site/urls.py

@@ -15,7 +15,7 @@
 urlpatterns = patterns('',
 
     url(r'^/?$', cache_page(60*60*24)(PythonKCComingSoon.as_view())),
-    url(r'^demo/?$', cache_page(60 * 5)(PythonKCHome.as_view()), name='home'),
+    url(r'^demo/?$', PythonKCHome.as_view(), name='home'),
 
     # Examples:
     # url(r'^$', 'pythonkc_site.views.home', name='home'),

pythonkc_site/views.py

@@ -2,12 +2,18 @@
 
 
 from django.conf import settings
+from django.core.cache import cache
 from django.core.exceptions import ImproperlyConfigured
 from django.core.urlresolvers import reverse
 from django.views.generic import FormView
 from django.views.generic.base import TemplateView
+from functools import wraps
 from pythonkc_meetups import PythonKCMeetups
 from pythonkc_site.forms import ContactForm
+import logging
+
+
+logger = logging.getLogger(__name__)
 
 
 try:
@@ -33,15 +39,16 @@ def form_valid(self, form):
         return super(PythonKCHome, self).form_valid(form)
 
     def get_context_data(self, **kwargs):
-        # NOTE Instead of individually caching next/past events, we're
-        # simply going to cache this whole page until things get more
-        # complicated (see urls.py for caching decoration).
 
+        @memoize_in_cache('next_event', 60 * 5)
         def get_next_event():
+            logging.info('Retrieving next event from Meetup.com')
             upcoming_events = meetups.get_upcoming_events()
             return upcoming_events[0] if upcoming_events else None
 
+        @memoize_in_cache('past_events', 60 * 60)
         def get_past_events():
+            logging.info('Retrieving past events from Meetup.com')
             return meetups.get_past_events()[:num_past_events]
 
         return {
@@ -51,5 +58,19 @@ def get_past_events():
         }
 
 
+def memoize_in_cache(cache_key, cache_timeout_seconds=None):
+    """Cache the result of a no-args function."""
+    def decorator(func):
+        @wraps(func)
+        def decorated():
+            value = cache.get(cache_key)
+            if not value:
+                value = func()
+                cache.set(cache_key, value, cache_timeout_seconds)
+            return value
+        return decorated
+    return decorator
+
+
 class PythonKCComingSoon(TemplateView):
     template_name = 'coming_soon.html'