feat: 看起来效果不错.

Proxd-man/Subscribe/SubscribeManager.cs

@@ -1,6 +1,7 @@
 using System.Buffers.Text;
 using System.Collections.Immutable;
 using System.Text;
+using System.Text.Json;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using Proxd_man.Config;
@@ -73,7 +74,10 @@ public class SubscribeManager
                 _logger.LogWarning(e, "更新订阅失败: {subscribeName}", subscribe.Name);
             }
 
-            newSubscribeOutbounds[subscribe] = outbounds;
+            if (outbounds.Count > 0)
+            {
+                newSubscribeOutbounds[subscribe] = outbounds;
+            }
             _logger.LogInformation("订阅 {subscribeName} 更新完成. (共 {outboundCount} 个节点)", subscribe.Name, outbounds.Count);
         }
         
@@ -94,14 +98,30 @@ public class SubscribeManager
     
     public void StartUpdateSubscribes()
     {
+        if (_cts != null)
+        {
+            StopUpdateSubscribes();
+        }
+        
         var cts = new CancellationTokenSource();
         
         Task.Run(async () =>
         {
-            while (!cts.IsCancellationRequested)
+            while (!cts.Token.IsCancellationRequested)
             {
+                if (_subscribeOutbounds.Count > 0)
+                {
+                    _logger.LogDebug("订阅更新完成, 将在 12 小时后再次更新.");
+                    await Task.Delay(TimeSpan.FromHours(12), cts.Token);
+                }
+                else
+                {
+                    _logger.LogDebug("没有可用的订阅, 将在 5 分钟后再次更新.");
+                    await Task.Delay(TimeSpan.FromMinutes(5), cts.Token);
+                }
+                
+                _logger.LogInformation("开始更新订阅...");
                 await CheckAndUpdateSubscribes(cts.Token);
-                await Task.Delay(TimeSpan.FromHours(12), cts.Token);
             }
         }, cts.Token);
         _cts = cts;
@@ -111,6 +131,7 @@ public class SubscribeManager
     public void StopUpdateSubscribes()
     {
         _cts?.Cancel();
+        _cts = null;
     }
     
 }