simplify

ErsatzTV.Core/Iptv/ChannelIdentifier.cs

@@ -1,5 +1,4 @@
 using System.Globalization;
-using System.Runtime.InteropServices;
 
 namespace ErsatzTV.Core.Iptv;
 
@@ -9,7 +8,6 @@ public static class ChannelIdentifier
 
     public static string FromNumber(string channelNumber)
     {
-        string instanceID = SystemEnvironment.InstanceID;
         // get rid of any decimal (only two are allowed)
         var number = (int)(decimal.Parse(channelNumber, CultureInfo.InvariantCulture) * 100);
         var id = 0;
@@ -19,6 +17,9 @@ public static class ChannelIdentifier
             number /= 10;
         }
 
-        return $"C{channelNumber}.{id}.{instanceID}";
+        string instanceId = SystemEnvironment.InstanceId;
+        return !string.IsNullOrWhiteSpace(instanceId)
+            ? $"C{channelNumber}.{id}.{instanceId}.ersatztv.org"
+            : $"C{channelNumber}.{id}.ersatztv.org";
     }
 }

ErsatzTV.Core/SystemEnvironment.cs

@@ -10,7 +10,7 @@ public class SystemEnvironment
 
         TranscodeFolder = Environment.GetEnvironmentVariable("ETV_TRANSCODE_FOLDER");
 
-        InstanceID = Environment.GetEnvironmentVariable("ETV_INSTANCE_ID") ?? "ersatztv.org";
+        InstanceId = Environment.GetEnvironmentVariable("ETV_INSTANCE_ID");
 
         string uiPortVariable = Environment.GetEnvironmentVariable("ETV_UI_PORT");
         if (!int.TryParse(uiPortVariable, out int uiPort))
@@ -73,5 +73,5 @@ public class SystemEnvironment
     public static int? SlowApiMs { get; }
     public static int JellyfinPageSize { get; }
     public static bool JellyfinEnableStats { get; }
-    public static string InstanceID { get; }
+    public static string InstanceId { get; }
 }

ErsatzTV/Properties/launchSettings.json

@@ -7,8 +7,7 @@
         "ASPNETCORE_ENVIRONMENT": "Development",
         "DOTNET_ENVIRONMENT": "Development",
         "ETV_STREAMING_PORT": "8409",
-        "ETV_UI_PORT": "8410",
-        "ETV_INSTANCE_ID": "ersatztv.org"
+        "ETV_UI_PORT": "8410"
       }
     }
   }