further improve db error handling

src/ez_lan_manager/pages/DbErrorPage.py

@@ -1,23 +1,33 @@
 from __future__ import annotations
 
+from asyncio import sleep
 from typing import *  # type: ignore
 
 from rio import Component, event, Spacer, Card, Container, Column, Row, TextStyle, Color, Text
 
+from src.ez_lan_manager.services.DatabaseService import DatabaseService
 from src.ez_lan_manager import ConfigurationService
 from src.ez_lan_manager.components.MainViewContentBox import MainViewContentBox
 
 
 class DbErrorPage(Component):
     @event.on_window_size_change
-    async def on_window_size_change(self):
+    async def on_window_size_change(self) -> None:
         await self.force_refresh()
 
+    @event.on_mount
+    async def retry_db_connect(self) -> None:
+        while not self.session[DatabaseService].is_connected:
+            await sleep(2)
+        self.session.navigate_to("./")
+
     def build(self) -> Component:
         content = Card(
             content=MainViewContentBox(
                 content=Text(
-                    text="Ouh-oh, da läuft gerade irgendwas schief mit unserer Datenbank.\n\nUnser Team kümmert sich bereits um das Problem.",
+                    text="Ouh-oh, da läuft gerade irgendwas schief.\n\n"
+                         "Unser Team kümmert sich bereits um das Problem.\n\n"
+                         "Du wirst automatisch weitergeleitet sobald das System wieder verfügbar ist.",
                     margin=2,
                     style=TextStyle(
                         fill=self.session.theme.danger_color,

src/ez_lan_manager/pages/NewsPage.py

@@ -3,11 +3,20 @@ from rio import Column, Component, event
 from src.ez_lan_manager import ConfigurationService, NewsService
 from src.ez_lan_manager.components.NewsPost import NewsPost
 from src.ez_lan_manager.pages import BasePage
+from src.ez_lan_manager.services.DatabaseService import NoDatabaseConnectionError
+from src.ez_lan_manager.types.News import News
+
 
 class NewsPage(Component):
+    news_posts: list[News] = []
+
     @event.on_populate
     async def on_populate(self) -> None:
         await self.session.set_title(f"{self.session[ConfigurationService].get_lan_info().name} - Neuigkeiten")
+        try:
+            self.news_posts = self.session[NewsService].get_news()[:8]
+        except NoDatabaseConnectionError:
+            self.session.navigate_to("db-error")
 
     def build(self) -> Component:
         posts = [NewsPost(
@@ -16,7 +25,7 @@ class NewsPage(Component):
             text=news.content,
             date=news.news_date.strftime("%d.%m.%Y"),
             author=news.author.user_name
-        ) for news in self.session[NewsService].get_news()[:8]]
+        ) for news in self.news_posts]
         return BasePage(
             content=Column(
                 *posts,