Remove IActionContext.NewGuid() & Add RandomExtension.GenerateRandomGuid()

Libplanet/Action/IActionContext.cs

@@ -55,12 +55,5 @@ public interface IActionContext
         /// <returns>A random object that shares interface mostly equivalent
         /// to <see cref="System.Random"/>.</returns>
         IRandom Random { get; }
-
-        /// <summary>
-        /// Creates new <see cref="Guid"/>.  Its seed (state) is determined by a block and
-        /// a transaction, which is deterministic as like <see cref="Random"/>.
-        /// </summary>
-        /// <returns>A deterministic guid.</returns>
-        Guid NewGuid();
     }
 }

Libplanet/Action/RandomExtension.cs

@@ -0,0 +1,26 @@
+using System;
+
+namespace Libplanet.Action
+{
+    /// <summary>
+    /// This extension class provides some convenient methods
+    /// to deal with <see cref="IRandom"/>.
+    /// </summary>
+    public static class RandomExtension
+    {
+        /// <summary>
+        /// Generates a random <see cref="Guid"/>.
+        /// </summary>
+        /// <param name="random"> <see cref="IRandom"/> to generate
+        /// a random <see cref="Guid"/>.</param>
+        /// <returns> Generated random <see cref="Guid"/>.
+        /// </returns>
+        /// <seealso cref="IRandom"/>
+        public static Guid GenerateRandomGuid(this IRandom random)
+        {
+            var bytes = new byte[16];
+            random.NextBytes(bytes);
+            return new Guid(bytes);
+        }
+    }
+}