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DataLoaderGenerator.cs
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DataLoaderGenerator.cs
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using System.Text;
using HotChocolate.Types.Analyzers.Helpers;
using HotChocolate.Types.Analyzers.Inspectors;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;
using static System.StringComparison;
using static HotChocolate.Types.Analyzers.Properties.SourceGenResources;
using static HotChocolate.Types.Analyzers.StringConstants;
using static HotChocolate.Types.Analyzers.WellKnownTypes;
namespace HotChocolate.Types.Analyzers.Generators;
public class DataLoaderGenerator : ISyntaxGenerator
{
private static readonly DiagnosticDescriptor _keyParameterMissing =
new(
id: "HC0074",
title: "Parameter Missing.",
messageFormat:
DataLoader_KeyParameterMissing,
category: "DataLoader",
DiagnosticSeverity.Error,
isEnabledByDefault: true);
private static readonly DiagnosticDescriptor _methodAccessModifierInvalid =
new(
id: "HC0075",
title: "Access Modifier Invalid.",
messageFormat:
DataLoader_InvalidAccessModifier,
category: "DataLoader",
DiagnosticSeverity.Error,
isEnabledByDefault: true);
public void Initialize(IncrementalGeneratorPostInitializationContext context) { }
public bool Consume(ISyntaxInfo syntaxInfo)
=> syntaxInfo is DataLoaderInfo or ModuleInfo or DataLoaderDefaultsInfo;
public void Generate(
SourceProductionContext context,
Compilation compilation,
IReadOnlyCollection<ISyntaxInfo> syntaxInfos)
{
var module =
syntaxInfos.OfType<ModuleInfo>().FirstOrDefault() ??
new ModuleInfo(
compilation.AssemblyName is null
? "AssemblyTypes"
: compilation.AssemblyName?.Split('.').Last() + "Types",
ModuleOptions.Default);
var defaults =
syntaxInfos.OfType<DataLoaderDefaultsInfo>().FirstOrDefault() ??
new DataLoaderDefaultsInfo(null, null, true, true);
var processed = new HashSet<string>(StringComparer.Ordinal);
var dataLoaders = new List<DataLoaderInfo>();
var sourceText = StringBuilderPool.Get();
sourceText.AppendLine("// <auto-generated/>");
sourceText.AppendLine("#nullable enable");
sourceText.AppendLine("using System;");
sourceText.AppendLine("using Microsoft.Extensions.DependencyInjection;");
sourceText.AppendLine("using HotChocolate.Execution.Configuration;");
foreach (var syntaxInfo in syntaxInfos)
{
if (syntaxInfo is DataLoaderInfo dataLoader)
{
if (dataLoader.MethodSymbol.Parameters.Length == 0)
{
context.ReportDiagnostic(
Diagnostic.Create(
_keyParameterMissing,
Location.Create(
dataLoader.MethodSyntax.SyntaxTree,
dataLoader.MethodSyntax.ParameterList.Span)));
continue;
}
if (dataLoader.MethodSymbol.DeclaredAccessibility is not Accessibility.Public
and not Accessibility.Internal and not Accessibility.ProtectedAndInternal)
{
context.ReportDiagnostic(
Diagnostic.Create(
_methodAccessModifierInvalid,
Location.Create(
dataLoader.MethodSyntax.SyntaxTree,
dataLoader.MethodSyntax.Modifiers.Span)));
continue;
}
var keyArg = dataLoader.MethodSymbol.Parameters[0];
var keyType = keyArg.Type;
var cancellationTokenIndex = -1;
var serviceMap = new Dictionary<int, string>();
if (IsKeysArgument(keyType))
{
keyType = ExtractKeyType(keyType);
}
InspectDataLoaderParameters(
dataLoader,
ref cancellationTokenIndex,
serviceMap);
DataLoaderKind kind;
if (IsReturnTypeDictionary(dataLoader.MethodSymbol.ReturnType, keyType))
{
kind = DataLoaderKind.Batch;
}
else if (IsReturnTypeLookup(dataLoader.MethodSymbol.ReturnType, keyType))
{
kind = DataLoaderKind.Group;
}
else
{
keyType = keyArg.Type;
kind = DataLoaderKind.Cache;
}
var valueType = ExtractValueType(dataLoader.MethodSymbol.ReturnType, kind);
if (processed.Add(dataLoader.FullName))
{
dataLoaders.Add(dataLoader);
GenerateDataLoader(
dataLoader,
defaults,
kind,
keyType,
valueType,
dataLoader.MethodSymbol.Parameters.Length,
cancellationTokenIndex,
serviceMap,
sourceText);
}
}
}
// if we find no valid DataLoader we will not create any file.
if (dataLoaders.Count > 0)
{
if (defaults.RegisterServices)
{
// write DI integration
sourceText.AppendLine();
sourceText.AppendLine("namespace Microsoft.Extensions.DependencyInjection");
sourceText.AppendLine("{");
GenerateDataLoaderRegistrations(module, dataLoaders, sourceText);
sourceText.AppendLine("}");
}
context.AddSource(
WellKnownFileNames.DataLoaderFile,
SourceText.From(sourceText.ToString(), Encoding.UTF8));
}
StringBuilderPool.Return(sourceText);
}
private static void GenerateDataLoader(
DataLoaderInfo dataLoader,
DataLoaderDefaultsInfo defaults,
DataLoaderKind kind,
ITypeSymbol keyType,
ITypeSymbol valueType,
int parameterCount,
int cancelIndex,
Dictionary<int, string> services,
StringBuilder sourceText)
{
var isScoped = dataLoader.IsScoped ?? defaults.Scoped ?? false;
var isPublic = dataLoader.IsPublic ?? defaults.IsPublic ?? true;
var isInterfacePublic = dataLoader.IsInterfacePublic ?? defaults.IsInterfacePublic ?? true;
sourceText.AppendLine();
sourceText.Append("namespace ");
sourceText.AppendLine(dataLoader.Namespace);
sourceText.AppendLine("{");
// first we generate a DataLoader interface ...
var interfaceName = dataLoader.InterfaceName;
if (isInterfacePublic)
{
sourceText.Append(" public interface ");
}
else
{
sourceText.Append(" internal interface ");
}
sourceText.Append(interfaceName);
if (kind is DataLoaderKind.Batch or DataLoaderKind.Cache)
{
sourceText.Append(" : global::GreenDonut.IDataLoader<");
sourceText.Append(keyType.ToFullyQualified());
sourceText.Append(", ");
sourceText.Append(valueType.ToFullyQualified());
sourceText.Append(">");
}
else if (kind is DataLoaderKind.Group)
{
sourceText.Append(" : global::GreenDonut.IDataLoader<");
sourceText.Append(keyType.ToFullyQualified());
sourceText.Append(", ");
sourceText.Append(valueType.ToFullyQualified());
sourceText.Append("[]>");
}
sourceText.AppendLine(" { }");
sourceText.AppendLine();
// ... then the actual DataLoader implementation.
if (isPublic)
{
sourceText.Append(" public sealed class ");
}
else
{
sourceText.Append(" internal sealed class ");
}
sourceText.Append(dataLoader.Name);
if (kind is DataLoaderKind.Batch)
{
sourceText.Append(" : global::GreenDonut.BatchDataLoader<");
sourceText.Append(keyType.ToFullyQualified());
sourceText.Append(", ");
sourceText.Append(valueType.ToFullyQualified());
sourceText.Append(">");
}
else if (kind is DataLoaderKind.Group)
{
sourceText.Append(" : global::GreenDonut.GroupedDataLoader<");
sourceText.Append(keyType.ToFullyQualified());
sourceText.Append(", ");
sourceText.Append(valueType.ToFullyQualified());
sourceText.Append(">");
}
else if (kind is DataLoaderKind.Cache)
{
sourceText.Append(" : global::GreenDonut.CacheDataLoader<");
sourceText.Append(keyType.ToFullyQualified());
sourceText.Append(", ");
sourceText.Append(valueType.ToFullyQualified());
sourceText.Append(">");
}
sourceText.Append(", ");
sourceText.AppendLine(interfaceName);
sourceText.AppendLine(" {");
sourceText.AppendLine(
" private readonly global::System.IServiceProvider _services;");
sourceText.AppendLine();
if (kind is DataLoaderKind.Batch or DataLoaderKind.Group)
{
sourceText
.Append(Indent)
.Append(Indent)
.AppendLine($"public {dataLoader.Name}(");
sourceText
.Append(Indent)
.Append(Indent)
.Append(Indent)
.AppendLine("global::System.IServiceProvider services,");
sourceText
.Append(Indent)
.Append(Indent)
.Append(Indent)
.AppendLine("global::GreenDonut.IBatchScheduler batchScheduler,");
sourceText
.Append(Indent)
.Append(Indent)
.Append(Indent)
.AppendLine("global::GreenDonut.DataLoaderOptions? options = null)");
sourceText
.Append(Indent)
.Append(Indent)
.Append(Indent)
.AppendLine(": base(batchScheduler, options)");
}
else
{
sourceText
.Append(Indent)
.Append(Indent)
.AppendLine($"public {dataLoader.Name}(");
sourceText
.Append(Indent)
.Append(Indent)
.Append(Indent)
.AppendLine("global::System.IServiceProvider services,");
sourceText
.Append(Indent)
.Append(Indent)
.Append(Indent)
.AppendLine("global::GreenDonut.DataLoaderOptions? options = null)");
sourceText
.Append(Indent)
.Append(Indent)
.Append(Indent)
.AppendLine(": base(options)");
}
sourceText.AppendLine(" {");
sourceText.AppendLine(" _services = services ??");
sourceText.Append(" throw new global::")
.AppendLine("System.ArgumentNullException(nameof(services));");
sourceText.AppendLine(" }");
sourceText.AppendLine();
if (kind is DataLoaderKind.Batch)
{
sourceText.Append($" protected override async global::{WellKnownTypes.Task}<");
sourceText.Append($"{ReadOnlyDictionary}<");
sourceText.Append(keyType.ToFullyQualified());
sourceText.Append(", ");
sourceText.Append(valueType.ToFullyQualified());
sourceText.Append(">> ");
sourceText.AppendLine("LoadBatchAsync(");
sourceText.Append($" {ReadOnlyList}<");
sourceText.AppendLine($"{keyType.ToFullyQualified()}> keys,");
sourceText.AppendLine($" global::{WellKnownTypes.CancellationToken} ct)");
}
else if (kind is DataLoaderKind.Group)
{
sourceText.Append($" protected override async global::{WellKnownTypes.Task}<");
sourceText.Append($"{Lookup}<");
sourceText.Append(keyType.ToFullyQualified());
sourceText.Append(", ");
sourceText.Append(valueType.ToFullyQualified());
sourceText.Append(">> ");
sourceText.AppendLine("LoadGroupedBatchAsync(");
sourceText.Append($" {ReadOnlyList}<");
sourceText.AppendLine($"{keyType.ToFullyQualified()}> keys,");
sourceText.AppendLine($" global::{WellKnownTypes.CancellationToken} ct)");
}
else if (kind is DataLoaderKind.Cache)
{
sourceText.Append($" protected override async global::{WellKnownTypes.Task}<");
sourceText.Append(valueType.ToFullyQualified());
sourceText.Append("> ");
sourceText.AppendLine("LoadSingleAsync(");
sourceText.AppendLine($" {keyType.ToFullyQualified()} key,");
sourceText.AppendLine($" {WellKnownTypes.CancellationToken} ct)");
}
sourceText.AppendLine(" {");
if (isScoped)
{
sourceText
.Append(Indent)
.Append(Indent)
.Append(Indent)
.AppendLine("await using var scope = _services.CreateAsyncScope();");
foreach (var item in services.OrderBy(t => t.Key))
{
sourceText.Append($" var p{item.Key} = ");
sourceText.Append("scope.ServiceProvider.GetRequiredService<");
sourceText.Append(item.Value);
sourceText.AppendLine(">();");
}
}
else
{
foreach (var item in services.OrderBy(t => t.Key))
{
sourceText.Append($" var p{item.Key} = _services.GetRequiredService<");
sourceText.Append(item.Value);
sourceText.AppendLine(">();");
}
}
sourceText.Append(" return await ");
sourceText.Append(dataLoader.ContainingType);
sourceText.Append(".");
sourceText.Append(dataLoader.MethodName);
sourceText.Append("(");
for (var i = 0; i < parameterCount; i++)
{
if (i > 0)
{
sourceText.Append(", ");
}
if (i == 0)
{
if (kind is DataLoaderKind.Batch or DataLoaderKind.Group)
{
sourceText.Append("keys");
}
else
{
sourceText.Append("key");
}
}
else if (i == cancelIndex)
{
sourceText.Append("ct");
}
else
{
sourceText.Append("p");
sourceText.Append(i);
}
}
sourceText.AppendLine(").ConfigureAwait(false);");
sourceText.AppendLine(" }");
sourceText.AppendLine(" }");
sourceText.AppendLine("}");
}
private static void GenerateDataLoaderRegistrations(
ModuleInfo module,
List<DataLoaderInfo> dataLoaders,
StringBuilder sourceText)
{
sourceText.Append(Indent)
.Append("public static partial class ")
.Append(module.ModuleName)
.AppendLine("RequestExecutorBuilderExtensions");
sourceText
.Append(Indent)
.AppendLine("{");
sourceText
.Append(Indent)
.Append(Indent)
.Append("static partial void RegisterGeneratedDataLoader(")
.AppendLine("IRequestExecutorBuilder builder)");
sourceText
.Append(Indent)
.Append(Indent)
.AppendLine("{");
foreach (var dataLoader in dataLoaders)
{
sourceText
.Append(Indent)
.Append(Indent)
.Append(Indent)
.Append("builder.AddDataLoader<")
.Append(dataLoader.InterfaceFullName)
.Append(", ")
.Append(dataLoader.FullName)
.AppendLine(">();");
}
sourceText
.Append(Indent)
.Append(Indent)
.AppendLine("}");
sourceText
.Append(Indent)
.AppendLine("}");
}
private void InspectDataLoaderParameters(
DataLoaderInfo dataLoader,
ref int cancellationTokenIndex,
Dictionary<int, string> serviceMap)
{
for (var i = 1; i < dataLoader.MethodSymbol.Parameters.Length; i++)
{
var argument = dataLoader.MethodSymbol.Parameters[i];
var argumentType = argument.Type.ToFullyQualified();
if (IsCancellationToken(argumentType))
{
if (cancellationTokenIndex != -1)
{
// report error
return;
}
cancellationTokenIndex = i;
}
else
{
serviceMap[i] = argumentType;
}
}
}
private static bool IsKeysArgument(ITypeSymbol type)
{
if (type is INamedTypeSymbol { IsGenericType: true, TypeArguments.Length: 1 } namedType &&
ReadOnlyList.Equals(ToTypeNameNoGenerics(namedType), Ordinal))
{
return true;
}
return false;
}
private static ITypeSymbol ExtractKeyType(ITypeSymbol type)
{
if (type is INamedTypeSymbol { IsGenericType: true, TypeArguments.Length: 1 } namedType &&
ReadOnlyList.Equals(ToTypeNameNoGenerics(namedType), Ordinal))
{
return namedType.TypeArguments[0];
}
throw new InvalidOperationException();
}
private static bool IsCancellationToken(string typeName)
=> string.Equals(typeName, WellKnownTypes.CancellationToken) ||
string.Equals(typeName, GlobalCancellationToken);
private static bool IsReturnTypeDictionary(ITypeSymbol returnType, ITypeSymbol keyType)
{
if (returnType is INamedTypeSymbol { TypeArguments.Length: 1 } namedType)
{
var resultType = namedType.TypeArguments[0];
if (IsReadOnlyDictionary(resultType) &&
resultType is INamedTypeSymbol { TypeArguments.Length: 2 } dictionaryType &&
dictionaryType.TypeArguments[0].Equals(keyType, SymbolEqualityComparer.Default))
{
return true;
}
}
return false;
}
private static bool IsReturnTypeLookup(ITypeSymbol returnType, ITypeSymbol keyType)
{
if (returnType is INamedTypeSymbol { TypeArguments.Length: 1 } namedType)
{
var resultType = namedType.TypeArguments[0];
if (ToTypeNameNoGenerics(resultType).Equals(Lookup, Ordinal) &&
resultType is INamedTypeSymbol { TypeArguments.Length: 2 } dictionaryType &&
dictionaryType.TypeArguments[0].Equals(keyType, SymbolEqualityComparer.Default))
{
return true;
}
}
return false;
}
private static bool IsReadOnlyDictionary(ITypeSymbol type)
{
if (!ToTypeNameNoGenerics(type).Equals(ReadOnlyDictionary, Ordinal))
{
foreach (var interfaceSymbol in type.Interfaces)
{
if (ToTypeNameNoGenerics(interfaceSymbol).Equals(ReadOnlyDictionary, Ordinal))
{
return true;
}
}
return false;
}
return true;
}
private static ITypeSymbol ExtractValueType(ITypeSymbol returnType, DataLoaderKind kind)
{
if (returnType is INamedTypeSymbol { TypeArguments.Length: 1 } namedType)
{
if (kind is DataLoaderKind.Batch or DataLoaderKind.Group &&
namedType.TypeArguments[0] is INamedTypeSymbol { TypeArguments.Length: 2 } dict)
{
return dict.TypeArguments[1];
}
if (kind is DataLoaderKind.Cache)
{
return namedType.TypeArguments[0];
}
}
throw new InvalidOperationException();
}
private static string ToTypeNameNoGenerics(ITypeSymbol typeSymbol)
=> $"{typeSymbol.ContainingNamespace}.{typeSymbol.Name}";
}