oops, touch requests are concurrent...

MareSynchronosServer/MareSynchronosStaticFilesServer/Services/CachedFileProvider.cs

@@ -114,7 +114,7 @@ public sealed class CachedFileProvider : IDisposable
         if (string.IsNullOrEmpty(_coldStoragePath)) return false;
 
         var coldStorageFilePath = FilePathUtil.GetFilePath(_coldStoragePath, hash);
-        if (coldStorageFilePath == null) return false;
+        if (!File.Exists(coldStorageFilePath)) return false;
 
         try
         {

MareSynchronosServer/MareSynchronosStaticFilesServer/Services/ColdTouchHashService.cs

@@ -1,5 +1,6 @@
 using MareSynchronosShared.Services;
 using MareSynchronosStaticFilesServer.Utils;
+using System.Collections.Concurrent;
 
 namespace MareSynchronosStaticFilesServer.Services;
 
@@ -13,9 +14,10 @@ public class ColdTouchHashService : ITouchHashService
     private readonly string _coldStoragePath;
 
     // Debounce multiple updates towards the same file
-	private readonly Dictionary<string, DateTime> _lastUpdateTimesUtc = new(1009, StringComparer.Ordinal);
+    private readonly ConcurrentDictionary<string, DateTime> _lastUpdateTimesUtc = new(StringComparer.Ordinal);
     private int _cleanupCounter = 0;
-	private const double _debounceTimeSecs = 90.0;
+    private object _cleanupLockObj = new();
+    private const double _debounceTimeSecs = 900.0;
 
     public ColdTouchHashService(ILogger<ColdTouchHashService> logger, IConfigurationService<StaticFilesServerConfiguration> configuration)
     {
@@ -45,12 +47,22 @@ public class ColdTouchHashService : ITouchHashService
         // Clean up debounce dictionary regularly
         if (_cleanupCounter++ >= 1000)
         {
-			foreach (var entry in _lastUpdateTimesUtc.Where(entry => (nowUtc - entry.Value).TotalSeconds >= _debounceTimeSecs).ToList())
-				_lastUpdateTimesUtc.Remove(entry.Key);
             _cleanupCounter = 0;
+            if (Monitor.TryEnter(_cleanupLockObj))
+            {
+                try
+                {
+                    foreach (var entry in _lastUpdateTimesUtc.Where(entry => (nowUtc - entry.Value).TotalSeconds >= _debounceTimeSecs).ToList())
+                        _lastUpdateTimesUtc.TryRemove(entry.Key, out _);
+                }
+                finally
+                {
+                    Monitor.Exit(_cleanupLockObj);
+                }
+            }
         }
 
-		// Ignore multiple updates within a 90 second window of the first
+        // Ignore multiple updates within a time window of the first
         if (_lastUpdateTimesUtc.TryGetValue(hash, out var lastUpdateTimeUtc) && (nowUtc - lastUpdateTimeUtc).TotalSeconds < _debounceTimeSecs)
         {
             _logger.LogDebug($"Debounced touch for {hash}");

MareSynchronosServer/MareSynchronosStaticFilesServer/Services/ShardTouchMessageService.cs

@@ -101,7 +101,7 @@ public class ShardTouchMessageService : ITouchHashService
                 }
                 if (hashes.Count > 0)
                     await SendTouches(hashes);
-                await Task.Delay(TimeSpan.FromSeconds(30), ct).ConfigureAwait(false);
+                await Task.Delay(TimeSpan.FromSeconds(60), ct).ConfigureAwait(false);
             }
             catch (Exception e)
             {