feat: Keep using the cached feed when the feed is offline

Closes #4

Author: kevinrenskers

example/uv.lock

@@ -1,6 +1,6 @@
 [project]
 name = "django-rss-filter"
-version = "0.9.0"
+version = "0.10.0"
 description = "Filter public RSS feeds, remove articles that contain certain keywords or categories."
 authors = [
     {name = "Kevin Renskers", email = "[email protected]"},

pyproject.toml

@@ -6,6 +6,7 @@
 from django.db import models
 from django.urls import reverse
 from django.utils import timezone
+from httpx import ConnectError, ConnectTimeout
 
 from . import USER_AGENT
 from .settings import RSS_FILTER_CACHE_SECONDS
@@ -61,9 +62,13 @@ def get_feed_body(self) -> str:
         if self.cache_date and self.cache_date > five_mins_ago:
             return self.feed_body
 
-        r = httpx.get(self.feed_url, follow_redirects=True, timeout=2, headers={"User-Agent": USER_AGENT})
-        self.feed_body = r.text
-        self.cache_date = timezone.now()
-        self.save()
+        try:
+            r = httpx.get(self.feed_url, follow_redirects=True, timeout=2, headers={"User-Agent": USER_AGENT})
+            self.feed_body = r.text
+            self.cache_date = timezone.now()
+            self.save()
+        except (ConnectTimeout, ConnectError):
+            # Do nothing, just return the cached version
+            pass
 
         return self.feed_body