caching and beta detection

- Caching using etag to lower impact on feeds.
- Keyword detection of beta releases.

issue_generator.py

@@ -162,18 +162,40 @@ class FeedReader:
         self.name = name
         self.url = url
         self.target = target
+        self.version_file = CONFIG_DIR + self.name
+        self.etag_file = CONFIG_DIR + self.name + ".etag"
+        self.beta_strings = [ "nightly", "beta", "alpha", "rc" ]
 
-    def first_item(self) -> dict[str, Any] | None:
+    def first_item(self) -> dict[str, Any] | None | int:
         '''Get the first item of the feed (newest)'''
-        feed = feedparser.parse(self.url)
+        if os.path.isfile(self.etag_file):
+            with open(self.etag_file, encoding="UTF-8") as file:
+                etag = file.readline()
+        else: etag = None
+        feed = feedparser.parse(self.url, etag=etag)
+        if feed.etag and feed.etag != etag:
+            with open(self.etag_file, mode='w', encoding="UTF-8") as file:
+                file.write(feed.etag)
+        if feed.status == 304:
+            return 304
         if len(feed.entries) == 0:
             return None
-        return feed.entries[0]
+        for entry in feed.entries:
+            skip = False
+            for beta in self.beta_strings:
+                if beta in self.entry_get_version(entry)[0]:
+                    skip = True
+                    break
+            if not skip:
+                return entry
+        return None
 
 
     def read_feed(self) -> bool | None:
         '''Read a feed and post an issue if a new item is found'''
         entry = self.first_item()
+        if entry == 304:
+            return False
         if not entry:
             return None
         version, _id = self.entry_get_version(entry)
@@ -192,7 +214,7 @@ class FeedReader:
             If the version is not new, or the posting fails, the method stops and returns False.'''
         # Match 1: with local file
         try:
-            with open(CONFIG_DIR + self.name, encoding="utf-8") as file:
+            with open(self.version_file, encoding="utf-8") as file:
                 match = file.readline().strip("\n") == str(_id)
         except FileNotFoundError:
             match = False
@@ -206,7 +228,7 @@ class FeedReader:
         # Save to disk
         if not os.path.isdir(CONFIG_DIR):
             os.makedirs(CONFIG_DIR)
-        with open(CONFIG_DIR + self.name, mode="w", encoding="utf-8") as file:
+        with open(self.version_file, mode="w", encoding="utf-8") as file:
             file.write(str(_id))
         return True