63 lines
2.7 KiB
C#
63 lines
2.7 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Reflection;
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namespace Microsoft.AspNetCore.Hosting.WebHostBuilderFactory
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{
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internal class WebHostFactoryResolver
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{
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public static readonly string CreateWebHostBuilder = nameof(CreateWebHostBuilder);
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public static readonly string BuildWebHost = nameof(BuildWebHost);
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public static FactoryResolutionResult ResolveWebHostBuilderFactory(Assembly assembly)
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{
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var programType = assembly?.EntryPoint?.DeclaringType;
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if (programType == null)
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{
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return FactoryResolutionResult.NoEntryPoint();
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}
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var factory = programType?.GetTypeInfo().GetDeclaredMethod(CreateWebHostBuilder);
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if (factory == null)
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{
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return FactoryResolutionResult.NoCreateWebHostBuilder(programType);
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}
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return FactoryResolutionResult.Succeded(args => (IWebHostBuilder)factory.Invoke(null, new object[] { args }), programType);
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}
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public static FactoryResolutionResult ResolveWebHostFactory(Assembly assembly)
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{
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// We want to give priority to BuildWebHost over CreateWebHostBuilder for backwards
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// compatibility with existing projects that follow the old pattern.
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var findResult = ResolveWebHostBuilderFactory(assembly);
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switch (findResult.ResultKind)
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{
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case FactoryResolutionResultKind.NoEntryPoint:
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return findResult;
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case FactoryResolutionResultKind.Success:
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case FactoryResolutionResultKind.NoCreateWebHostBuilder:
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var buildWebHostMethod = findResult.ProgramType.GetTypeInfo().GetDeclaredMethod("BuildWebHost");
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if (buildWebHostMethod == null)
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{
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if (findResult.ResultKind == FactoryResolutionResultKind.Success)
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{
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return findResult;
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}
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return FactoryResolutionResult.NoBuildWebHost(findResult.ProgramType);
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}
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else
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{
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return FactoryResolutionResult.Succeded(args => (IWebHost)buildWebHostMethod.Invoke(null, new object[] { args }), findResult.ProgramType);
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}
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case FactoryResolutionResultKind.NoBuildWebHost:
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default:
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throw new InvalidOperationException();
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}
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}
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}
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}
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