fixed Deluge failing when WebUI is not connected

code/Common/Exceptions/FatalException.cs

@@ -0,0 +1,12 @@
+namespace Common.Exceptions;
+
+public class FatalException : Exception
+{
+    public FatalException()
+    {
+    }
+
+    public FatalException(string message) : base(message)
+    {
+    }
+}

code/Infrastructure/Verticals/DownloadClient/Deluge/DelugeClient.cs

@@ -2,6 +2,7 @@
 using System.Text.Json.Serialization;
 using Common.Configuration;
 using Common.Configuration.DownloadClient;
+using Common.Exceptions;
 using Domain.Models.Deluge.Exceptions;
 using Domain.Models.Deluge.Request;
 using Domain.Models.Deluge.Response;
@@ -43,9 +44,23 @@ public sealed class DelugeClient
         return await SendRequest<bool>("auth.login", _config.Password);
     }
 
-    public async Task ListMethodsAsync()
+    public async Task<bool> IsConnected()
     {
-        await SendRequest<object>("system.listMethods");
+        return await SendRequest<bool>("web.connected");
+    }
+
+    public async Task<bool> Connect()
+    {
+        string? firstHost = await GetHost();
+
+        if (string.IsNullOrEmpty(firstHost))
+        {
+            return false;
+        }
+
+        var result = await SendRequest<List<string>?>("web.connect", firstHost);
+        
+        return result?.Count > 0;
     }
 
     public async Task<bool> Logout()
@@ -53,6 +68,18 @@ public sealed class DelugeClient
         return await SendRequest<bool>("auth.delete_session");
     }
 
+    public async Task<string?> GetHost()
+    {
+        var hosts = await SendRequest<List<List<string>?>?>("web.get_hosts");
+
+        if (hosts?.Count > 1)
+        {
+            throw new FatalException("multiple Deluge hosts found - please connect to only one host");
+        }
+        
+        return hosts?.FirstOrDefault()?.FirstOrDefault();
+    }
+
     public async Task<List<DelugeTorrent>> ListTorrents(Dictionary<string, string>? filters = null)
     {
         filters ??= new Dictionary<string, string>();

code/Infrastructure/Verticals/DownloadClient/Deluge/DelugeService.cs

@@ -5,6 +5,7 @@ using Common.Configuration.ContentBlocker;
 using Common.Configuration.DownloadCleaner;
 using Common.Configuration.DownloadClient;
 using Common.Configuration.QueueCleaner;
+using Common.Exceptions;
 using Domain.Enums;
 using Domain.Models.Deluge.Response;
 using Infrastructure.Extensions;
@@ -49,7 +50,11 @@ public class DelugeService : DownloadService, IDelugeService
     public override async Task LoginAsync()
     {
         await _client.LoginAsync();
-        await _client.ListMethodsAsync();
+
+        if (!await _client.IsConnected() && !await _client.Connect())
+        {
+            throw new FatalException("Deluge WebUI is not connected to the daemon");
+        }
     }
 
     /// <inheritdoc/>