improve error handling for the case the database can not be reached

src/EzLanManager.py

@@ -1,12 +1,14 @@
 import logging
+import sys
 
 from pathlib import Path
 
 from rio import App, Theme, Color, Font, Page, Session
 from from_root import from_root
 
-from src.ez_lan_manager import pages, init_services
+from src.ez_lan_manager import pages, init_services, ConfigurationService
 from src.ez_lan_manager.helpers.LoggedInGuard import logged_in_guard, not_logged_in_guard
+from src.ez_lan_manager.services.DatabaseService import NoDatabaseConnectionError
 from src.ez_lan_manager.types.SessionStorage import SessionStorage
 
 logger = logging.getLogger(__name__.split(".")[-1])
@@ -26,7 +28,43 @@ if __name__ == "__main__":
         font=Font(from_root("src/ez_lan_manager/assets/fonts/joystix.otf"))
     )
 
-    services = init_services()
+    try:
+        services = init_services()
+    except NoDatabaseConnectionError:
+        configuration_service = ConfigurationService(from_root("config.toml"))
+        lan_info = configuration_service.get_lan_info()
+        app = App(
+            name="EZ LAN Manager",
+            pages=[
+                Page(
+                    name="DbErrorPage",
+                    page_url="",
+                    build=pages.DbErrorPage,
+                )
+            ],
+            theme=theme,
+            default_attachments=[configuration_service],
+            assets_dir=Path(__file__).parent / "assets",
+            icon=from_root("src/ez_lan_manager/assets/img/favicon.png"),
+            meta_tags={
+                "robots": "INDEX,FOLLOW",
+                "description": f"Info und Verwaltungs-Seite der LAN Party '{lan_info.name} - {lan_info.iteration}'.",
+                "og:description": f"Info und Verwaltungs-Seite der LAN Party '{lan_info.name} - {lan_info.iteration}'.",
+                "keywords": "Gaming, Clan, Guild, Verein, Club, Einfach, Zocken, Genuss, Gesellschaft, Videospiele, "
+                            "Videogames, LAN, Party, EZ, LAN, Manager",
+                "author": "David Rodenkirchen",
+                "publisher": "EZ GG e.V.",
+                "copyright": "EZ GG e.V.",
+                "audience": "Alle",
+                "page-type": "Management Application",
+                "page-topic": "LAN Party",
+                "expires": "",
+                "revisit-after": "2 days"
+            }
+        )
+        sys.exit(app.run_as_web_server())
+
+
     lan_info = services[2].get_lan_info()
 
     async def on_session_start(session: Session) -> None:
@@ -143,4 +181,4 @@ if __name__ == "__main__":
         }
     )
 
-    app.run_as_web_server()
+    sys.exit(app.run_as_web_server())

src/ez_lan_manager/pages/DbErrorPage.py

@@ -0,0 +1,78 @@
+from __future__ import annotations
+
+from typing import *  # type: ignore
+
+from rio import Component, event, Spacer, Card, Container, Column, Row, TextStyle, Color, Text
+
+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):
+        await self.force_refresh()
+
+    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.",
+                    margin=2,
+                    style=TextStyle(
+                        fill=self.session.theme.danger_color,
+                        font_size=1.3
+                    ),
+                    wrap=True
+                )
+            ),
+            color="secondary",
+            min_width=38,
+            corner_radius=(0, 0.5, 0, 0)
+        )
+        if self.session.window_width > 28:
+            return Container(
+                content=Column(
+                    Column(
+                        Row(
+                            Spacer(grow_x=True, grow_y=True),
+                            Card(
+                                content=Spacer(),
+                                color=self.session.theme.neutral_color,
+                                min_width=15,
+                                grow_y=True,
+                                corner_radius=(0.5, 0, 0, 0),
+                                margin_right=0.1
+                            ),
+                            content,
+                            Spacer(grow_x=True, grow_y=True),
+                            grow_y=True
+                        ),
+                        Row(
+                            Spacer(grow_x=True, grow_y=False),
+                            Card(
+                                content=Text(f"EZ LAN Manager Version {self.session[ConfigurationService].APP_VERSION} © EZ GG e.V.", align_x=0.5, align_y=0.5, style=TextStyle(fill=self.session.theme.primary_color, font_size=0.5)),
+                                color=self.session.theme.neutral_color,
+                                corner_radius=(0, 0, 0.5, 0.5),
+                                grow_x=False,
+                                grow_y=False,
+                                min_height=1.2,
+                                min_width=53.1,
+                                margin_bottom=3
+                            ),
+                            Spacer(grow_x=True, grow_y=False),
+                            grow_y=False
+                        ),
+                        margin_top=4
+                    )
+                ),
+            grow_x=True,
+            grow_y=True
+            )
+        else:
+            return Text(
+                "Der EZ LAN Manager wird\nauf mobilen Endgeräten nur\nim Querformat unterstützt.\nBitte drehe dein Gerät.",
+                align_x=0.5,
+                align_y=0.5,
+                style=TextStyle(fill=Color.from_hex("FFFFFF"), font_size=0.8)
+            )

src/ez_lan_manager/pages/__init__.py

@@ -12,3 +12,4 @@ from .FaqPage import FaqPage
 from .TournamentsPage import TournamentsPage
 from .GuestsPage import GuestsPage
 from .CateringPage import CateringPage
+from .DbErrorPage import DbErrorPage

src/ez_lan_manager/services/DatabaseService.py

@@ -21,6 +21,9 @@ logger = logging.getLogger(__name__.split(".")[-1])
 class DuplicationError(Exception):
     pass
 
+class NoDatabaseConnectionError(Exception):
+    pass
+
 class DatabaseService:
     def __init__(self, database_config: DatabaseConfiguration) -> None:
         self._database_config = database_config
@@ -37,8 +40,8 @@ class DatabaseService:
                 database=self._database_config.db_name
             )
         except mariadb.Error as e:
-            logger.fatal(f"Error connecting to database: {e}")
-            sys.exit(1)
+            logger.error(f"Error connecting to database: {e}")
+            raise NoDatabaseConnectionError
 
     def _get_cursor(self) -> Cursor:
         return self._connection.cursor()