Made targets work with a json

main.py

@@ -77,7 +77,7 @@ class HealthBot(discord.Client):
         session = await self._ensure_session()
         return await checks.run_checks(session, config.CHECK_TIMEOUT)
 
-    def build_embed(self, results):
+    def build_embed(self, results, using_backup=False):
         color = _health_color(results)
         embed = discord.Embed(
             title='Service Health',
@@ -115,14 +115,20 @@ class HealthBot(discord.Client):
                 lines.append(f'**DNS resolution ({label})** {val}')
 
             embed.add_field(name=r['name'], value='\n'.join(lines), inline=False)
-        embed.set_footer(text=f'Updates every {config.CHECK_INTERVAL}s')
+        embed.set_footer(text=self._footer_text(using_backup))
         return embed
 
+    def _footer_text(self, using_backup):
+        text = f'Updates every {config.CHECK_INTERVAL}s'
+        if using_backup:
+            text += ' · ⚠ targets.json invalid — using last known-good config'
+        return text
+
     async def update_embeds(self):
         if not self.status_messages:
             return
-        results = await self.run_checks()
-        embed = self.build_embed(results)
+        results, using_backup = await self.run_checks()
+        embed = self.build_embed(results, using_backup)
 
         kept = []
         for entry in self.status_messages:
@@ -172,8 +178,14 @@ bot = HealthBot()
 @bot.tree.command(name='status', description='Post a live-updating health embed for the services')
 async def status(interaction: discord.Interaction):
     await interaction.response.defer()
-    results = await bot.run_checks()
-    embed = bot.build_embed(results)
+    try:
+        results, using_backup = await bot.run_checks()
+    except checks.TargetsConfigError as exc:
+        await interaction.followup.send(
+            f'Could not load targets config: {exc}', ephemeral=True,
+        )
+        return
+    embed = bot.build_embed(results, using_backup)
 
     existing = next(
         (m for m in bot.status_messages if m['channel_id'] == interaction.channel_id),