private IServiceProvider CreateServiceProviderCore(IEnumerable <ICodeGenerator> codeGenerators, ILogger logger, Action <ILogger, string, Exception> log4GenerateCode)
{
var generatedTypes = new List <GeneratedTypeEntry>();
var generationContext = new CodeGenerationContext();
generationContext.WriteLines("using System;");
generationContext.WriteLines("using System.Reflection;");
generationContext.WriteLines("using System.Threading.Tasks;");
generationContext.WriteLines("using Microsoft.Extensions.DependencyInjection;");
generationContext.WriteLines("");
generationContext.WriteLines("namespace Dora.Interception.CodeGeneration");
using (generationContext.CodeBlock())
{
foreach (var service in _services)
{
foreach (var generator in codeGenerators)
{
if (generator.TryGenerate(service, generationContext, out var proxyTypeNames))
{
generatedTypes.Add(new GeneratedTypeEntry(service, proxyTypeNames !, generator));
break;
}
}
}
}
log4GenerateCode(logger, generationContext.SourceCode, null !);
if (generatedTypes.Any())
{
var compilation = CSharpCompilation.Create("Dora.Interception.CodeGeneration")
.WithOptions(new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary, optimizationLevel: OptimizationLevel.Release))
.AddSyntaxTrees(SyntaxFactory.ParseSyntaxTree(generationContext.SourceCode))
.AddReferences(generationContext.References.Select(it => MetadataReference.CreateFromFile(it.Location)));
Assembly outputAssembly;
using var stream = new MemoryStream();
var compilationResult = compilation.Emit(stream);
if (!compilationResult.Success)
{
var error = string.Join(Environment.NewLine, compilationResult.Diagnostics);
throw new InterceptionException($"It fails to generate proxy class. \n {error}");
}
var bytes = stream.ToArray();
outputAssembly = Assembly.Load(bytes);
foreach (var entry in generatedTypes)
{
var proxyTypes = entry.ProxyTypeNames.Select(it => outputAssembly.GetType(it)).ToArray();
entry.CodeGenerator.RegisterProxyType(_services, entry.ServiceDescriptor, proxyTypes !);
}
}
_services.Replace(ServiceDescriptor.Singleton <IServiceLifetimeProvider> (new ServiceLifetimeProvider(_services)));
var serviceProvider = _services.BuildServiceProvider(_serviceProviderOptions);
((ApplicationServicesAccessor)serviceProvider.GetRequiredService <IApplicationServicesAccessor>()).ApplicationServices = serviceProvider;
MethodInvokerBuilder.Instance = serviceProvider.GetRequiredService <IMethodInvokerBuilder>();
return(serviceProvider);
}