💥 Deprecate PoW evaluation

CHANGES.md

@@ -6,13 +6,27 @@ Version 4.6.0
 
 To be released.
 
+Due to changes in [#3789], a network ran with a prior version
+may not be compatible with this version.  The native implementation of
+`IActionEvaluator`, which is `ActionEvaluator`, no longer supports
+evaluation of PoW `Block`s.  That is, it is no longer possible to
+reconstruct states with valid state root hashes purely from past
+`Block`s that includes PoW `Block`s.
+
 ### Deprecated APIs
 
  -  (Libplanet.Common) Removed `Nonce` struct.  [[#3793], [#3794]]
  -  Removed `AtomicActionRenderer` class.  [[#3795]]
 
 ### Backward-incompatible API changes
 
+ -  (Libplanet.Action) Changed `ActionEvaluate.Evaluate()` to no longer
+    accept `IPreEvaluationBlock` with a protocol version less than
+    `BlockMetadata.PBFTProtocolVersion`.  [[#3789]]
+ -  (Libplanet.Action) Changed the description of `IActionEvaluate.Evaluate()`
+    so that it may throw `BlockProtocolVersionNotSupportedException` if
+    its implementation is not able to handle `IPreEvaluationBlock` with
+    certain `BlockMetadata.ProtocolVersion`s.  [[#3789]]
  -  (Libplanet.Types) Removed `nonce` parameter from
     `BlockMetadata.DerivePreEvaluationHash()` and
     `BlockMetadata.MakeCandidateData()` methods.  [[#3793], [#3794]]
@@ -26,6 +40,9 @@ To be released.
 
 ### Added APIs
 
+ -  (Libplanet.Action) Added `BlockProtocolVersionNotSupportedException` class.
+    [[#3789]]
+
 ### Behavioral changes
 
 ### Bug fixes
@@ -34,6 +51,7 @@ To be released.
 
 ### CLI tools
 
+[#3789]: https://github.com/planetarium/libplanet/pull/3789
 [#3793]: https://github.com/planetarium/libplanet/issues/3793
 [#3794]: https://github.com/planetarium/libplanet/pull/3794
 [#3795]: https://github.com/planetarium/libplanet/pull/3795

Libplanet.Action.Tests/BlockProtocolVersionNotSupportedExceptionTest.cs

@@ -0,0 +1,26 @@
+using System.Runtime.Serialization.Formatters.Binary;
+using Xunit;
+
+namespace Libplanet.Action.Tests
+{
+    public class BlockProtocolVersionNotSupportedExceptionTest
+    {
+        [Fact]
+        public void Serializable()
+        {
+            var exc = new BlockProtocolVersionNotSupportedException("Foo", 5);
+
+            var formatter = new BinaryFormatter();
+            using (var ms = new MemoryStream())
+            {
+                formatter.Serialize(ms, exc);
+
+                ms.Seek(0, SeekOrigin.Begin);
+                var deserialized = Assert.IsType<BlockProtocolVersionNotSupportedException>(
+                    formatter.Deserialize(ms));
+                Assert.Equal("Foo", deserialized.Message);
+                Assert.Equal(5, deserialized.BlockProtocolVersion);
+            }
+        }
+    }
+}

Libplanet.Action/ActionEvaluator.cs

@@ -98,6 +98,16 @@ public IReadOnlyList<ICommittedActionEvaluation> Evaluate(
             IPreEvaluationBlock block,
             HashDigest<SHA256>? baseStateRootHash)
         {
+            if (block.ProtocolVersion < BlockMetadata.PBFTProtocolVersion)
+            {
+                throw new BlockProtocolVersionNotSupportedException(
+                    $"The native implementation does not support an evaluation of a block " +
+                    $"#{block.Index} pre-evaluation hash {block.PreEvaluationHash} " +
+                    $"with protocol version less than {BlockMetadata.PBFTProtocolVersion}: " +
+                    $"{block.ProtocolVersion}",
+                    block.ProtocolVersion);
+            }
+
             _logger.Information(
                 "Evaluating actions in the block #{BlockIndex} " +
                 "pre-evaluation hash {PreEvaluationHash}...",

Libplanet.Action/BlockProtocolVersionNotSupportedException.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Runtime.Serialization;
+using Libplanet.Types.Blocks;
+
+namespace Libplanet.Action
+{
+    /// <summary>
+    /// The exception that is thrown when an <see cref="IPreEvaluationBlock"/> with
+    /// a protocol version that is not supported by an implementation of
+    /// <see cref="IActionEvaluator"/> is passed as an argument to
+    /// <see cref="IActionEvaluator.Evaluate"/>.
+    /// </summary>
+    [Serializable]
+    public sealed class BlockProtocolVersionNotSupportedException : Exception
+    {
+        /// <summary>
+        /// Creates a new <see cref="BlockProtocolVersionNotSupportedException"/> object.
+        /// </summary>
+        /// <param name="message">Specifies a <see cref="Exception.Message"/>.</param>
+        /// <param name="blockProtocolVersion">The <see cref="Block.ProtocolVersion"/> of the
+        /// <see cref="Block"/> that <paramref name="action"/> belongs to.</param>
+        public BlockProtocolVersionNotSupportedException(
+            string message,
+            int blockProtocolVersion)
+            : base(message)
+        {
+            BlockProtocolVersion = blockProtocolVersion;
+        }
+
+        private BlockProtocolVersionNotSupportedException(
+            SerializationInfo info,
+            StreamingContext context)
+            : base(info, context)
+        {
+            BlockProtocolVersion = (int)info.GetValue(
+                nameof(BlockProtocolVersion),
+                typeof(int))!;
+        }
+
+        /// <summary>
+        /// The <see cref="Block.ProtocolVersion"/> of the <see cref="Block"/> that is
+        /// not supported by an implementation of <see cref="IActionEvaluator"/>.
+        /// </summary>
+        public int BlockProtocolVersion { get; }
+
+        public override void GetObjectData(SerializationInfo info, StreamingContext context)
+        {
+            base.GetObjectData(info, context);
+            info.AddValue(nameof(BlockProtocolVersion), BlockProtocolVersion, typeof(int));
+        }
+    }
+}

Libplanet.Action/IActionEvaluator.cs

@@ -37,6 +37,10 @@ public interface IActionEvaluator
         /// the end.
         /// </para>
         /// </remarks>
+        /// <exception cref="BlockProtocolVersionNotSupportedException">Thrown when
+        /// <paramref name="block"/> has a <see cref="IPreEvaluationBlock.ProtocolVersion"/>
+        /// that is not supported by an implementation of <see cref="IActionEvaluator"/>.
+        /// </exception>
         [Pure]
         IReadOnlyList<ICommittedActionEvaluation> Evaluate(
             IPreEvaluationBlock block,

Libplanet.Tests/Action/ActionEvaluatorTest.cs

@@ -11,6 +11,7 @@
 using Libplanet.Action.Tests.Common;
 using Libplanet.Blockchain;
 using Libplanet.Blockchain.Policies;
+using Libplanet.Common;
 using Libplanet.Crypto;
 using Libplanet.Mocks;
 using Libplanet.Store;
@@ -1226,6 +1227,18 @@ public void CheckRandomSeedInAction()
             }
         }
 
+        [Fact]
+        public void BlockProtocolVersionNotSupported()
+        {
+            Block block = BlockMarshaler.UnmarshalBlock(LegacyBlocks.BencodedV1Block);
+            var actionEvaluator = new ActionEvaluator(
+                _ => null,
+                new TrieStateStore(new MemoryKeyValueStore()),
+                new SingleActionLoader(typeof(DumbAction)));
+            Assert.Throws<BlockProtocolVersionNotSupportedException>(
+                () => actionEvaluator.Evaluate(block, null));
+        }
+
         private (Address[], Transaction[]) MakeFixturesForAppendTests(
             PrivateKey privateKey = null,
             DateTimeOffset epoch = default)