Export all states as JSON

CHANGES.md

@@ -299,8 +299,8 @@ To be released.
  -  The `planet` command became installable using `npm`.  [[#923], [#982]]
  -  Fixed a bug that <kbd>^H</kbd> had not removed the rightmost character
     in passphrase prompts.  [[#983], [#984]]
- -  Added a new sub-command `planet mpt`.  [[#1023]]
- -  Introduced a configuration file.  It's placed in:  [[#1023]]
+ -  Added a new sub-command `planet mpt`.  [[#1023], [#1026]]
+ -  Introduced a configuration file.  It's placed in:  [[#1023], [#1026]]
      -  Linux/macOS: *<var>$XDG_CONFIG_HOME</var>/planetarium/cli.json*
      -  Windows: *<var>%AppData%</var>\planetarium\cli.json*
 
@@ -377,6 +377,7 @@ To be released.
 [#1021]: https://github.com/planetarium/libplanet/pull/1021
 [#1022]: https://github.com/planetarium/libplanet/pull/1022
 [#1023]: https://github.com/planetarium/libplanet/pull/1023
+[#1026]: https://github.com/planetarium/libplanet/pull/1026
 [sleep mode]: https://en.wikipedia.org/wiki/Sleep_mode
 
 

Libplanet.Tests/ImmutableArrayEqualityComparer.cs

@@ -0,0 +1,26 @@
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+
+namespace Libplanet.Tests
+{
+    public class ImmutableArrayEqualityComparer<T> : IEqualityComparer<ImmutableArray<T>>
+    {
+        public bool Equals(ImmutableArray<T> x, ImmutableArray<T> y)
+            => x.Length == y.Length && x.SequenceEqual(y);
+
+        public int GetHashCode(ImmutableArray<T> obj)
+        {
+            int code = 0;
+            unchecked
+            {
+                foreach (T el in obj)
+                {
+                    code = (code * 397) ^ el.GetHashCode();
+                }
+            }
+
+            return code;
+        }
+    }
+}

Libplanet.Tests/Store/Trie/MerkleTrieExtensionsTest.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Collections.Immutable;
 using System.Linq;
 using System.Security.Cryptography;
 using Bencodex.Types;
@@ -39,5 +40,42 @@ public void DifferentNodes()
             Assert.Equal(trieA.Hash, differentNodes["03"][0].Root);
             Assert.Equal(trieB.Hash, differentNodes["04"][0].Root);
         }
+
+        [Fact]
+        public void ListAllStates()
+        {
+            IKeyValueStore keyValueStore = new MemoryKeyValueStore();
+            MerkleTrie trie = new MerkleTrie(keyValueStore);
+
+            trie.Set(new byte[] { 0x01, }, default(Null));
+            trie.Set(new byte[] { 0x02, }, default(Null));
+            trie.Set(new byte[] { 0x03, }, default(Null));
+            trie.Set(new byte[] { 0x04, }, default(Null));
+            trie.Set(new byte[] { 0xbe, 0xef }, Dictionary.Empty);
+
+            Dictionary<ImmutableArray<byte>, IValue> states =
+                trie.ListAllStates().ToDictionary(
+                    pair => pair.Key,
+                    pair => pair.Value,
+                    new ImmutableArrayEqualityComparer<byte>());
+            Assert.Equal(5, states.Count);
+            Assert.Equal(default(Null), states[ImmutableArray<byte>.Empty.Add(0x01)]);
+            Assert.Equal(default(Null), states[ImmutableArray<byte>.Empty.Add(0x02)]);
+            Assert.Equal(default(Null), states[ImmutableArray<byte>.Empty.Add(0x03)]);
+            Assert.Equal(default(Null), states[ImmutableArray<byte>.Empty.Add(0x04)]);
+            Assert.Equal(Dictionary.Empty, states[ImmutableArray<byte>.Empty.Add(0xbe).Add(0xef)]);
+
+            trie = (MerkleTrie)trie.Commit();
+            states = trie.ListAllStates().ToDictionary(
+                pair => pair.Key,
+                pair => pair.Value,
+                new ImmutableArrayEqualityComparer<byte>());
+            Assert.Equal(5, states.Count);
+            Assert.Equal(default(Null), states[ImmutableArray<byte>.Empty.Add(0x01)]);
+            Assert.Equal(default(Null), states[ImmutableArray<byte>.Empty.Add(0x02)]);
+            Assert.Equal(default(Null), states[ImmutableArray<byte>.Empty.Add(0x03)]);
+            Assert.Equal(default(Null), states[ImmutableArray<byte>.Empty.Add(0x04)]);
+            Assert.Equal(Dictionary.Empty, states[ImmutableArray<byte>.Empty.Add(0xbe).Add(0xef)]);
+        }
     }
 }

Libplanet.Tools/Mpt.cs

@@ -5,6 +5,8 @@
 using System.Linq;
 using System.Security.Cryptography;
 using System.Text;
+using System.Text.Json;
+using Bencodex;
 using Cocona;
 using Cocona.Help;
 using Libplanet.RocksDBStore;
@@ -89,6 +91,51 @@ public class Mpt
             }
         }
 
+        [Command(Description = "Export all states of the state root hash as JSON.")]
+        public void Export(
+            [Argument(
+                Name = "KEY-VALUE-STORE",
+                Description = "The path where IKeyValueStore implementation was used at.")]
+            string kvStoreUri,
+            [Argument(
+                Name = "STATE-ROOT-HASH",
+                Description = "The state root hash to compare.")]
+            string stateRootHashHex,
+            [FromService] IConfigurationService<ToolConfiguration> configurationService)
+        {
+            // If it is not Uri format,
+            // try to get uri from configuration service by using it as alias.
+            if (!Uri.IsWellFormedUriString(kvStoreUri, UriKind.Absolute))
+            {
+                try
+                {
+                    var configuration = configurationService.Load();
+                    kvStoreUri = configuration.Mpt.Aliases[kvStoreUri];
+                }
+                catch (KeyNotFoundException)
+                {
+                    var exceptionMessage =
+                        $"The alias, '{kvStoreUri}' doesn't exist. " +
+                        $"Please pass correct uri or alias.";
+                    throw new CommandExitedException(
+                        exceptionMessage,
+                        -1);
+                }
+            }
+
+            IKeyValueStore keyValueStore = LoadKVStoreFromURI(kvStoreUri);
+            var trie = new MerkleTrie(
+                keyValueStore,
+                HashDigest<SHA256>.FromString(stateRootHashHex));
+            var codec = new Codec();
+            ImmutableDictionary<string, byte[]> decoratedStates = trie.ListAllStates()
+                .ToImmutableDictionary(
+                    pair => Encoding.UTF8.GetString(pair.Key.ToArray()),
+                    pair => codec.Encode(pair.Value));
+
+            Console.WriteLine(JsonSerializer.Serialize(decoratedStates));
+        }
+
         // FIXME: Now, it works like `set` not `add`. It allows override.
         [Command(Description="Add a new mpt store alias.")]
         public void Add(

Libplanet/Store/Trie/MerkleTrieExtensions.cs

@@ -40,6 +40,20 @@ public static class MerkleTrieExtensions
                     group.Count() == 1 || !group.All(v => v.Value.Equals(group.First().Value)));
         }
 
+        /// <summary>
+        /// Lists the all states key and the all states in the given <paramref name="merkleTrie"/>.
+        /// </summary>
+        /// <param name="merkleTrie">A trie to discover.</param>
+        /// <returns>All state keys and the all states.</returns>
+        public static IEnumerable<KeyValuePair<ImmutableArray<byte>, IValue>> ListAllStates(
+            this MerkleTrie merkleTrie)
+        {
+            return merkleTrie.IterateNodes().Where(pair => pair.Node is ValueNode).Select(pair =>
+                new KeyValuePair<ImmutableArray<byte>, IValue>(
+                    FromKey(pair.Path),
+                    ((ValueNode)pair.Node).Value));
+        }
+
         private static ImmutableArray<byte> FromKey(ImmutableArray<byte> bytes)
         {
             if (bytes.Length % 2 == 1)