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ApplyExtensionsMiddleware.cs
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ApplyExtensionsMiddleware.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading.Tasks;
using HotChocolate.Language;
using HotChocolate.Language.Visitors;
using HotChocolate.Utilities;
using static System.Array;
namespace HotChocolate.Stitching.Types.Pipeline.ApplyExtensions;
public sealed class ApplyExtensionsMiddleware
{
private const string _schema = "$schema";
private readonly IApplyExtension[] _applyExtensions =
{
new ApplyObjectTypeExtension(),
new ApplyInterfaceTypeExtension(),
};
private readonly MergeSchema _next;
public ApplyExtensionsMiddleware(MergeSchema next)
{
_next = next;
}
public async ValueTask InvokeAsync(ISchemaMergeContext context)
{
var definitions = new Dictionary<string, ITypeSystemDefinitionNode>();
var extensions = new List<ITypeSystemExtensionNode>();
for (var i = 0; i < context.Documents.Count; i++)
{
Document document = context.Documents[i];
CollectTypeDefinitions(definitions, extensions, document.SyntaxTree);
CollectTypeExtensions(extensions, document.SyntaxTree);
DocumentNode rewritten = ApplyExtensions(definitions, extensions);
document = new Document(document.Name, rewritten);
context.Documents = context.Documents.SetItem(i, document);
}
await _next(context);
}
private static void CollectTypeDefinitions(
Dictionary<string, ITypeSystemDefinitionNode> definitions,
List<ITypeSystemExtensionNode> extensions,
DocumentNode document)
{
foreach (IDefinitionNode definition in document.Definitions)
{
if (definition is ITypeSystemDefinitionNode typeDef)
{
var name = GetName(typeDef);
if (definitions.ContainsKey(name))
{
// Directive definitions have no extensions syntax,
// so if find a second directive with the same name we will just drop it.
if (definition.Kind is not SyntaxKind.DirectiveDefinition)
{
extensions.Add(ConvertToExtension(typeDef));
}
}
else
{
definitions.Add(name, typeDef);
}
}
}
}
private static void CollectTypeExtensions(
List<ITypeSystemExtensionNode> extensions,
DocumentNode document)
{
foreach (IDefinitionNode definition in document.Definitions)
{
if (definition is ITypeSystemExtensionNode typeExt)
{
extensions.Add(typeExt);
}
}
}
private DocumentNode ApplyExtensions(
Dictionary<string, ITypeSystemDefinitionNode> definitions,
List<ITypeSystemExtensionNode> extensions)
{
var preserved = new List<ITypeSystemExtensionNode>();
foreach (ITypeSystemExtensionNode extension in extensions)
{
if (extension is SchemaExtensionNode schemaExt)
{
ApplyExtensions(definitions, schemaExt);
}
else if (extension is ITypeExtensionNode typeExt)
{
// We try to apply the type extension. If we do not find a definition that we
// can apply it to we will preserve the extension for latter processing steps.
if (!TryApplyExtensions(definitions, typeExt))
{
preserved.Add(typeExt);
}
}
else
{
throw new ArgumentOutOfRangeException(nameof(extensions), extension, null);
}
}
// We create a single document per service where the extensions are at the top.
var definitionList = new List<IDefinitionNode>();
definitionList.AddRange(preserved.OrderBy(t => ((IHasName)t).Name.Value));
definitionList.AddRange(definitions.OrderBy(t => t.Key).Select(t => t.Value));
return new DocumentNode(definitionList);
}
private static void ApplyExtensions(
Dictionary<string, ITypeSystemDefinitionNode> definitions,
SchemaExtensionNode extension)
{
if (definitions.TryGetValue(_schema, out ITypeSystemDefinitionNode? def) &&
def is SchemaDefinitionNode schemaDef)
{
var directives = schemaDef.Directives.ToList();
directives.AddRange(extension.Directives);
definitions[_schema] = schemaDef.WithDirectives(directives);
}
else
{
definitions[_schema] = new SchemaDefinitionNode(
null,
null,
extension.Directives,
extension.OperationTypes);
}
}
private bool TryApplyExtensions(
Dictionary<string, ITypeSystemDefinitionNode> definitions,
ITypeExtensionNode extension)
{
if (definitions.TryGetValue(extension.Name.Value, out ITypeSystemDefinitionNode? node) &&
node is ITypeDefinitionNode typeDef)
{
for (var i = 0; i < _applyExtensions.Length; i++)
{
ITypeDefinitionNode? merged = _applyExtensions[i].TryApply(typeDef, extension);
if (merged is not null)
{
definitions[extension.Name.Value] = merged;
return true;
}
}
}
return false;
}
private static ITypeSystemExtensionNode ConvertToExtension(IDefinitionNode typeDef)
=> typeDef switch
{
ObjectTypeDefinitionNode objectTypeDef => ConvertToExtension(objectTypeDef),
InterfaceTypeDefinitionNode interfaceTypeDef => ConvertToExtension(interfaceTypeDef),
UnionTypeDefinitionNode unionTypeDef => ConvertToExtension(unionTypeDef),
InputObjectTypeDefinitionNode inputTypeDef => ConvertToExtension(inputTypeDef),
EnumTypeDefinitionNode enumTypeDef => ConvertToExtension(enumTypeDef),
ScalarTypeDefinitionNode scalarTypeDef => ConvertToExtension(scalarTypeDef),
SchemaDefinitionNode schemaDef => ConvertToExtension(schemaDef),
_ => throw new ArgumentOutOfRangeException(nameof(typeDef), typeDef, null)
};
private static ObjectTypeExtensionNode ConvertToExtension(
ObjectTypeDefinitionNode typeDef)
=> new ObjectTypeExtensionNode(
typeDef.Location,
typeDef.Name,
typeDef.Directives,
typeDef.Interfaces,
typeDef.Fields);
private static InterfaceTypeExtensionNode ConvertToExtension(
InterfaceTypeDefinitionNode typeDef)
=> new InterfaceTypeExtensionNode(
typeDef.Location,
typeDef.Name,
typeDef.Directives,
typeDef.Interfaces,
typeDef.Fields);
private static UnionTypeExtensionNode ConvertToExtension(
UnionTypeDefinitionNode typeDef)
=> new UnionTypeExtensionNode(
typeDef.Location,
typeDef.Name,
typeDef.Directives,
typeDef.Types);
private static InputObjectTypeExtensionNode ConvertToExtension(
InputObjectTypeDefinitionNode typeDef)
=> new InputObjectTypeExtensionNode(
typeDef.Location,
typeDef.Name,
typeDef.Directives,
typeDef.Fields);
private static EnumTypeExtensionNode ConvertToExtension(
EnumTypeDefinitionNode typeDef)
=> new EnumTypeExtensionNode(
typeDef.Location,
typeDef.Name,
typeDef.Directives,
typeDef.Values);
private static ScalarTypeExtensionNode ConvertToExtension(
ScalarTypeDefinitionNode typeDef)
=> new ScalarTypeExtensionNode(
typeDef.Location,
typeDef.Name,
typeDef.Directives);
private static SchemaExtensionNode ConvertToExtension(
SchemaDefinitionNode schemaDef)
=> new SchemaExtensionNode(
schemaDef.Location,
schemaDef.Directives,
schemaDef.OperationTypes);
private static string GetName(IDefinitionNode definition)
=> definition switch
{
IHasName typeDef => typeDef.Name.Value,
SchemaDefinitionNode => _schema,
SchemaExtensionNode => _schema,
_ => throw new ArgumentOutOfRangeException(nameof(definition), definition, null)
};
}