Add schema to configs that enables autocompletion

Author: flcl42

src/Nethermind/Nethermind.Runner/configs/op-mainnet.cfg

@@ -1,4 +1,5 @@
 {
+  "$schema": "https://gist.githubusercontent.com/flcl42/25b0396678b02cfc0c5dc1d68ea085a7/raw/2fda5155f38e9816bead94682eac92d3b7e74b8c/nethermind-config-schema.json",
   "Init": {
     "ChainSpecPath": "chainspec/op-mainnet.json",
     "GenesisHash": "0x7ca38a1916c42007829c55e69d3e9a73265554b586a499015373241b8a3fa48b",

tools/SchemaGenerator/Program.cs

@@ -0,0 +1,77 @@
+
+using NJsonSchema;
+using System.Reflection;
+using System.Reflection.Emit;
+using Nethermind.Config;
+using Nethermind.Core.Collections;
+
+Type iConfigType = typeof(IConfig);
+
+Type[] types = [
+    ..Directory.GetFiles(".", "Nethermind.*.dll").SelectMany(f => GetConfigTypes(Assembly.LoadFrom(f))),
+    ];
+
+var assemblyName = new AssemblyName("Nethermind.Config");
+var assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
+ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("MainModule");
+
+TypeBuilder typeBuilder = moduleBuilder.DefineType("NethermindConfig", TypeAttributes.Public);
+
+foreach (Type configInterface in types)
+{
+    CreateProperty(typeBuilder, configInterface);
+}
+
+Type configType = typeBuilder.CreateType();
+
+JsonSchema schema = JsonSchema.FromType(configType);
+
+foreach (var def in schema.Definitions)
+{
+    if(def.Value.Enumeration is { Count: > 0 })
+    {
+        def.Value.Type = JsonObjectType.String;
+        def.Value.Enumeration.Clear();
+        def.Value.Enumeration.AddRange(def.Value.EnumerationNames);
+    }
+}
+
+Console.WriteLine(schema.ToJson());
+
+void CreateProperty(TypeBuilder typeBuilder, Type classType)
+{
+    Type interfaceType = classType.GetInterfaces().First(i => iConfigType.IsAssignableFrom(i) && i != iConfigType);
+    string propertyName = interfaceType.Name.Substring(1, interfaceType.Name.Length - 7);
+    FieldBuilder fieldBuilder = typeBuilder.DefineField($"_{propertyName}", interfaceType, FieldAttributes.Private);
+    PropertyBuilder propertyBuilder = typeBuilder.DefineProperty(propertyName, PropertyAttributes.HasDefault, interfaceType, null);
+    MethodBuilder getMethodBuilder = typeBuilder.DefineMethod($"get_{propertyName}",
+        MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig,
+        interfaceType,
+        Type.EmptyTypes);
+
+    ILGenerator getIL = getMethodBuilder.GetILGenerator();
+    getIL.Emit(OpCodes.Ldarg_0);
+    getIL.Emit(OpCodes.Ldfld, fieldBuilder);
+    getIL.Emit(OpCodes.Ret);
+
+    // Define the 'set' accessor method
+    MethodBuilder setMethodBuilder = typeBuilder.DefineMethod($"set_{propertyName}",
+        MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig,
+        null,
+        [interfaceType]);
+
+    ILGenerator setIL = setMethodBuilder.GetILGenerator();
+    setIL.Emit(OpCodes.Ldarg_0);
+    setIL.Emit(OpCodes.Ldarg_1);
+    setIL.Emit(OpCodes.Stfld, fieldBuilder);
+    setIL.Emit(OpCodes.Ret);
+
+    // Map the get and set methods to the property
+    propertyBuilder.SetGetMethod(getMethodBuilder);
+    propertyBuilder.SetSetMethod(setMethodBuilder);
+}
+
+IEnumerable<Type> GetConfigTypes(Assembly assembly)
+{
+    return assembly.GetTypes().Where(t => iConfigType.IsAssignableFrom(t) && t.IsClass && !t.IsAbstract);
+}

tools/SchemaGenerator/SchemaGenerator.csproj

@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="NJsonSchema" Version="11.0.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Nethermind\Nethermind.Api\Nethermind.Api.csproj" />
+    <ProjectReference Include="..\..\src\Nethermind\Nethermind.Init.Snapshot\Nethermind.Init.Snapshot.csproj" />
+    <ProjectReference Include="..\..\src\Nethermind\Nethermind.Optimism\Nethermind.Optimism.csproj" />
+  </ItemGroup>
+
+</Project>