Purge Fastly on Page Save

    - Fixes #480
    - Is a NOOP if DEBUG=True or FASTLY_API_KEY does not exist
    - Will create infrastructure ticket to set key in production

Author: frankwiles

fastly/__init__.py

@@ -0,0 +1 @@
+# Intentionally left blank

fastly/models.py

@@ -0,0 +1,22 @@
+import requests
+
+from django.conf import settings
+
+
+def purge_url(path):
+    """
+    Purge a Fastly.com URL given a path. path argument must begin with a slash
+    """
+    if settings.DEBUG:
+        return
+
+    api_key = getattr(settings, 'FASTLY_API_KEY', None)
+    if api_key:
+        response = requests.request(
+            'PURGE',
+            'https://www.python.org{}'.format(path),
+            headers={'Fastly-Key': api_key},
+        )
+        return response
+
+    return None

fastly/utils.py

@@ -8,11 +8,16 @@
 
 import os
 import re
+
 from django.conf import settings
 from django.core import validators
 from django.db import models
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+
 from markupfield.fields import MarkupField
 from cms.models import ContentManageable
+from fastly.utils import purge_url
 from .managers import PageManager
 
 DEFAULT_MARKUP_TYPE = getattr(settings, 'DEFAULT_MARKUP_TYPE', 'restructuredtext')
@@ -73,6 +78,15 @@ def get_absolute_url(self):
         return "/{}/".format(self.path)
 
 
+@receiver(post_save, sender=Page)
+def purge_fastly_cache(sender, instance, **kwargs):
+    """
+    Purge fastly.com cache if in production and the page is published.
+    Requires settings.FASTLY_API_KEY being set
+    """
+    purge_url('/{}'.format(instance.path))
+
+
 def page_image_path(instance, filename):
     return os.path.join(settings.MEDIA_ROOT, instance.page.path, filename)