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Implement PluginLoadContext for dependency resolution in plugin loading
Co-authored-by: matt-goldman <[email protected]>
1 parent 9c0f2ac commit eda9832

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14 files changed

+253
-12
lines changed

14 files changed

+253
-12
lines changed

‎src/Blake.BuildTools/Blake.BuildTools.csproj‎

Lines changed: 4 additions & 3 deletions
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@@ -1,7 +1,7 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<AssemblyName>Blake.BuildTools</AssemblyName>
@@ -47,13 +47,14 @@
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<ItemGroup>
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<PackageReference Include="YamlDotNet" Version="16.3.0" />
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<PackageReference Include="Microsoft.AspNetCore.Components" Version="9.0.0" />
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<PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="9.0.0" />
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<PackageReference Include="Microsoft.AspNetCore.Components" Version="8.0.11" />
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<PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="8.0.11" />
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</ItemGroup>
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<!-- Set InternalVisibleTo to allow access to internal members for testing -->
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<ItemGroup>
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<InternalsVisibleTo Include="Blake.CLI" />
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<InternalsVisibleTo Include="Blake.BuildTools.Tests" />
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</ItemGroup>
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</Project>

‎src/Blake.BuildTools/Generator/SiteGenerator.cs‎

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@@ -328,7 +328,7 @@ private static async Task BakeContent(BlakeContext context, GenerationOptions op
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// create output filename - remove spaces or dashes, and convert to PascalCase instead
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// Razor filenames must be PascalCase and cannot contain spaces or dashes; this avoids enforcing this convention in markdown files
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var fileNameParts = fileName.Split([' ', '-'], StringSplitOptions.RemoveEmptyEntries);
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var fileNameParts = fileName.Split(new char[] { ' ', '-' }, StringSplitOptions.RemoveEmptyEntries);
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var outputFileName = string.Join("", fileNameParts.Select(part => char.ToUpperInvariant(part[0]) + part.Substring(1).ToLowerInvariant()));
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var outputPath = Path.Combine(outputDir, $"{outputFileName}.razor");

‎src/Blake.BuildTools/Utils/PluginLoadContext.cs‎

Lines changed: 41 additions & 0 deletions
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@@ -0,0 +1,41 @@
1+
using System.Reflection;
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using System.Runtime.Loader;
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4+
namespace Blake.BuildTools.Utils;
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/// <summary>
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/// A custom AssemblyLoadContext that provides isolated plugin loading with dependency resolution.
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/// Each plugin gets its own load context to avoid dependency conflicts.
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/// </summary>
10+
internal class PluginLoadContext : AssemblyLoadContext
11+
{
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private readonly AssemblyDependencyResolver _resolver;
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public PluginLoadContext(string pluginPath) : base(isCollectible: true)
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{
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_resolver = new AssemblyDependencyResolver(pluginPath);
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}
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protected override Assembly? Load(AssemblyName assemblyName)
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{
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string? assemblyPath = _resolver.ResolveAssemblyToPath(assemblyName);
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if (assemblyPath != null)
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{
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return LoadFromAssemblyPath(assemblyPath);
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}
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// Return null to fall back to default load context for shared dependencies
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return null;
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}
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protected override IntPtr LoadUnmanagedDll(string unmanagedDllName)
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{
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string? libraryPath = _resolver.ResolveUnmanagedDllToPath(unmanagedDllName);
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if (libraryPath != null)
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{
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return LoadUnmanagedDllFromPath(libraryPath);
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}
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return IntPtr.Zero;
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}
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}

‎src/Blake.BuildTools/Utils/PluginLoader.cs‎

Lines changed: 7 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -185,7 +185,11 @@ private static void LoadPluginDLLs(List<string> files, List<PluginContext> plugi
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186186
try
187187
{
188-
var assembly = Assembly.LoadFrom(file);
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// Create a new load context for this plugin to resolve its dependencies
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var loadContext = new PluginLoadContext(file);
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var assemblyName = new AssemblyName(Path.GetFileNameWithoutExtension(file));
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var assembly = loadContext.LoadFromAssemblyName(assemblyName);
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189193
var pluginTypes = assembly.GetTypes()
190194
.Where(t => typeof(IBlakePlugin).IsAssignableFrom(t) && !t.IsInterface && !t.IsAbstract);
191195

@@ -199,7 +203,8 @@ private static void LoadPluginDLLs(List<string> files, List<PluginContext> plugi
199203
}
200204
catch (Exception ex)
201205
{
202-
logger?.LogError("Error loading plugin from {file}", file, ex);
206+
logger?.LogError("Error loading plugin from {file}: {message}", file, ex.Message);
207+
logger?.LogDebug(ex, "Full error details for plugin {file}", file);
203208
}
204209
}
205210
}

‎src/Blake.CLI/Blake.CLI.csproj‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2,7 +2,7 @@
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net9.0</TargetFramework>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<PackAsTool>true</PackAsTool>

‎src/Blake.MarkdownParser/Blake.MarkdownParser.csproj‎

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@@ -1,7 +1,7 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<Authors>Matt Goldman</Authors>

‎src/Blake.Types/Blake.Types.csproj‎

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@@ -1,7 +1,7 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<AssemblyName>Blake.Types</AssemblyName>

‎tests/Blake.BuildTools.Tests/Blake.BuildTools.Tests.csproj‎

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@@ -1,7 +1,7 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<TargetFramework>net8.0</TargetFramework>
55
<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<IsPackable>false</IsPackable>

‎tests/Blake.BuildTools.Tests/Utils/PluginLoaderTests.cs‎

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@@ -0,0 +1,70 @@
1+
using Blake.BuildTools.Utils;
2+
using Microsoft.Extensions.Logging;
3+
using Xunit;
4+
5+
namespace Blake.BuildTools.Tests.Utils;
6+
7+
public class PluginLoaderTests
8+
{
9+
[Fact]
10+
public void LoadPluginDLLs_WithPluginWithDependencies_LoadsSuccessfully()
11+
{
12+
// Arrange
13+
var logger = new TestLogger();
14+
var pluginPath = Path.GetFullPath(Path.Combine(
15+
Directory.GetCurrentDirectory(),
16+
"..", "..", "..", "..", "..", "tests", "Blake.IntegrationTests",
17+
"TestPluginWithDependencies", "bin", "Debug", "net8.0",
18+
"BlakePlugin.TestPluginWithDependencies.dll"
19+
));
20+
21+
// Skip test if plugin doesn't exist (build not run)
22+
if (!File.Exists(pluginPath))
23+
{
24+
Assert.True(true, "Plugin not built - skipping test");
25+
return;
26+
}
27+
28+
var files = new List<string> { pluginPath };
29+
var plugins = new List<PluginContext>();
30+
31+
// Act & Assert - should not throw exception
32+
var exception = Record.Exception(() =>
33+
{
34+
// Use reflection to call the private method
35+
var method = typeof(PluginLoader).GetMethod("LoadPluginDLLs",
36+
System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Static);
37+
method?.Invoke(null, new object[] { files, plugins, logger });
38+
});
39+
40+
// Assert
41+
Assert.Null(exception);
42+
Assert.Single(plugins);
43+
Assert.Equal("BlakePlugin.TestPluginWithDependencies", plugins[0].PluginName);
44+
45+
// Ensure no errors were logged
46+
Assert.Empty(logger.ErrorMessages);
47+
}
48+
49+
private class TestLogger : ILogger
50+
{
51+
public List<string> ErrorMessages { get; } = new List<string>();
52+
public List<string> InfoMessages { get; } = new List<string>();
53+
54+
public IDisposable? BeginScope<TState>(TState state) where TState : notnull => null;
55+
public bool IsEnabled(LogLevel logLevel) => true;
56+
57+
public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception? exception, Func<TState, Exception?, string> formatter)
58+
{
59+
var message = formatter(state, exception);
60+
if (logLevel == LogLevel.Error)
61+
{
62+
ErrorMessages.Add(message);
63+
}
64+
else if (logLevel == LogLevel.Information)
65+
{
66+
InfoMessages.Add(message);
67+
}
68+
}
69+
}
70+
}

‎tests/Blake.IntegrationTests/Blake.IntegrationTests.csproj‎

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@@ -1,7 +1,7 @@
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<Project Sdk="Microsoft.NET.Sdk">
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33
<PropertyGroup>
4-
<TargetFramework>net9.0</TargetFramework>
4+
<TargetFramework>net8.0</TargetFramework>
55
<ImplicitUsings>enable</ImplicitUsings>
66
<Nullable>enable</Nullable>
77
<GenerateAssemblyInfo>false</GenerateAssemblyInfo>

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