Cache when reading embedded resources

v2rayN/ServiceLib/Common/EmbedUtils.cs

@@ -0,0 +1,61 @@
+using System.Collections.Concurrent;
+using System.Reflection;
+
+namespace ServiceLib.Common;
+
+public static class EmbedUtils
+{
+    private static readonly string _tag = "EmbedUtils";
+    private static readonly ConcurrentDictionary<string, string> _dicEmbedCache = new();
+
+    /// <summary>
+    /// Get embedded text resources
+    /// </summary>
+    /// <param name="res"></param>
+    /// <returns></returns>
+    public static string GetEmbedText(string res)
+    {
+        if (_dicEmbedCache.TryGetValue(res, out var value))
+        {
+            return value;
+        }
+        var result = string.Empty;
+
+        try
+        {
+            var assembly = Assembly.GetExecutingAssembly();
+            using var stream = assembly.GetManifestResourceStream(res);
+            ArgumentNullException.ThrowIfNull(stream);
+            using StreamReader reader = new(stream);
+            result = reader.ReadToEnd();
+        }
+        catch (Exception ex)
+        {
+            Logging.SaveLog(_tag, ex);
+        }
+
+        _dicEmbedCache.TryAdd(res, result);
+        return result;
+    }
+
+    /// <summary>
+    /// Get local storage resources
+    /// </summary>
+    /// <returns></returns>
+    public static string? LoadResource(string? res)
+    {
+        try
+        {
+            if (File.Exists(res))
+            {
+                return File.ReadAllText(res);
+            }
+        }
+        catch (Exception ex)
+        {
+            Logging.SaveLog(_tag, ex);
+        }
+
+        return null;
+    }
+}