Add nep11 tracker

neo-modules.sln

@@ -36,6 +36,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DBFTPlugin", "src\DBFTPlugi
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Neo.Plugins.RpcServer.Tests", "tests\Neo.Plugins.RpcServer.Tests\Neo.Plugins.RpcServer.Tests.csproj", "{0DDAF738-0FD3-40A7-A433-C514BCDDF542}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "RpcNep11Tracker", "src\RpcNep11Tracker\RpcNep11Tracker.csproj", "{16E35B32-34CC-4525-88D5-926B7D1E7092}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -102,6 +104,10 @@ Global
 		{0DDAF738-0FD3-40A7-A433-C514BCDDF542}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{0DDAF738-0FD3-40A7-A433-C514BCDDF542}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{0DDAF738-0FD3-40A7-A433-C514BCDDF542}.Release|Any CPU.Build.0 = Release|Any CPU
+		{16E35B32-34CC-4525-88D5-926B7D1E7092}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{16E35B32-34CC-4525-88D5-926B7D1E7092}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{16E35B32-34CC-4525-88D5-926B7D1E7092}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{16E35B32-34CC-4525-88D5-926B7D1E7092}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -122,6 +128,7 @@ Global
 		{149822EC-4E0C-425F-A032-4196B615BFEB} = {59D802AB-C552-422A-B9C3-64D329FBCDCC}
 		{90185D3E-4813-4BC1-98FE-26FD34311403} = {97E81C78-1637-481F-9485-DA1225E94C23}
 		{0DDAF738-0FD3-40A7-A433-C514BCDDF542} = {59D802AB-C552-422A-B9C3-64D329FBCDCC}
+		{16E35B32-34CC-4525-88D5-926B7D1E7092} = {97E81C78-1637-481F-9485-DA1225E94C23}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {61D3ADE6-BBFC-402D-AB42-1C71C9F9EDE3}

src/RpcNep11Tracker/Extensions.cs

@@ -0,0 +1,63 @@
+// Copyright (C) 2015-2021 The Neo Project.
+//
+//  The neo is free software distributed under the MIT software license, 
+//  see the accompanying file LICENSE in the main directory of the
+//  project or http://www.opensource.org/licenses/mit-license.php 
+//  for more details. 
+//  Redistribution and use in source and binary forms with or without
+//  modifications are permitted.
+
+using Neo.IO;
+using Neo.VM.Types;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Neo.Persistence;
+
+namespace Neo.Plugins
+{
+    public static class Extensions
+    {
+        public static bool NotNull(this StackItem item)
+        {
+            return !item.IsNull;
+        }
+
+        public static string ToBase64(this ReadOnlySpan<byte> item)
+        {
+            return item == null ? String.Empty : Convert.ToBase64String(item);
+        }
+
+        public static int GetVarSize(this ByteString item)
+        {
+            var length = item.GetSpan().Length;
+            return IO.Helper.GetVarSize(length) + length;
+        }
+
+        public static IEnumerable<(TKey, TValue)> FindPrefix<TKey, TValue>(this IStore db, byte[] prefix)
+            where TKey : IEquatable<TKey>, ISerializable, new()
+            where TValue : class, ISerializable, new()
+        {
+            foreach (var (key, value) in db.Seek(prefix, SeekDirection.Forward))
+            {
+                if (!key.AsSpan().StartsWith(prefix)) break;
+                yield return (key.AsSerializable<TKey>(1), value.AsSerializable<TValue>());
+            }
+
+
+        }
+
+        public static IEnumerable<(TKey, TValue)> FindRange<TKey, TValue>(this IStore db, byte[] startKey, byte[] endKey)
+            where TKey : IEquatable<TKey>, ISerializable, new()
+            where TValue : class, ISerializable, new()
+        {
+            foreach (var (key, value) in db.Seek(startKey, SeekDirection.Forward))
+            {
+                if (key.AsSpan().SequenceCompareTo(endKey) > 0) break;
+                yield return (key.AsSerializable<TKey>(1), value.AsSerializable<TValue>());
+            }
+        }
+    }
+}