Purge related URLs from varnish when a new item is fetched from RSS

Fixes #95

pgweb/core/models.py

@@ -1,6 +1,7 @@
 from django.db import models
 from django.contrib.auth.models import User
 from pgweb.util.bases import PgModel
+from pgweb.util.misc import varnish_purge
 
 from datetime import datetime
 
@@ -86,6 +87,11 @@ class Organisation(PgModel, models.Model):
 class ImportedRSSFeed(models.Model):
 	internalname = models.CharField(max_length=32, null=False, blank=False, unique=True)
 	url = models.URLField(null=False, blank=False)
+	purgepattern = models.CharField(max_length=512, null=False, blank=True, help_text="NOTE! Pattern will be automatically anchored with ^ at the beginning, but you must lead with a slash in most cases - and don't forget to include the trailing $ in most cases")
+
+	def purge_related(self):
+		if self.purgepattern:
+			varnish_purge(self.purgepattern)
 
 	def __unicode__(self):
 		return self.internalname

tools/rss/fetch_rss_feeds.py

@@ -32,6 +32,7 @@ for importfeed in ImportedRSSFeed.objects.all():
 			raise Exception('Feed load error with no exception!')
 		if feed.status != 200:
 			raise Exception('Feed returned status %s' % feed.status)
+		fetchedsomething = False
 		for entry in feed.entries:
 			try:
 				item = ImportedRSSItem.objects.get(feed=importfeed, url=entry.link)
@@ -42,6 +43,9 @@ for importfeed in ImportedRSSFeed.objects.all():
 									   posttime=datetime.strptime(entry.date, "%a, %d %b %Y %H:%M:%S %Z"),
 									   )
 				item.save()
+				fetchedsomething = True
+		if fetchedsomething:
+			importfeed.purge_related()
 		transaction.commit()
 	except Exception, e:
 		print "Failed to load %s: %s" % (importfeed, e)