/
PackageDirectoryExtensionLoader.cs
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/
PackageDirectoryExtensionLoader.cs
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// Copyright (c) .NET Foundation and contributors. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Loader;
using System.Threading.Tasks;
using Microsoft.DotNet.Interactive.Events;
using Microsoft.DotNet.Interactive.Telemetry;
using Pocket;
using static Pocket.Logger<Microsoft.DotNet.Interactive.App.PackageDirectoryExtensionLoader>;
namespace Microsoft.DotNet.Interactive.App;
internal class PackageDirectoryExtensionLoader
{
private readonly TelemetrySender _telemetrySender;
private const string ExtensionScriptName = "extension.dib";
private readonly HashSet<AssemblyName> _loadedAssemblies = new();
private readonly object _lock = new();
public PackageDirectoryExtensionLoader(TelemetrySender telemetrySender = null)
{
_telemetrySender = telemetrySender;
}
public async Task LoadFromDirectoryAsync(
DirectoryInfo directory,
Kernel kernel,
KernelInvocationContext context)
{
if (directory is null)
{
throw new ArgumentNullException(nameof(directory));
}
if (kernel is null)
{
throw new ArgumentNullException(nameof(kernel));
}
if (context is null)
{
throw new ArgumentNullException(nameof(context));
}
if (!directory.Exists)
{
throw new ArgumentException($"Directory {directory.FullName} doesn't exist", nameof(directory));
}
using var op = new ConfirmationLogger(
operationName: nameof(LoadFromDirectoryAsync),
category: Log.Category,
message: $"Loading extensions in directory {directory}",
logOnStart: true,
args: new object[] { directory });
await LoadFromDllsInDirectoryAsync(
directory,
kernel,
context);
await LoadFromExtensionDibScriptAsync(
directory,
kernel,
context);
op.Succeed();
}
private async Task LoadFromDllsInDirectoryAsync(
DirectoryInfo directory,
Kernel kernel,
KernelInvocationContext context)
{
var extensionDlls = directory.GetFiles("*.dll", SearchOption.TopDirectoryOnly);
foreach (var extensionDll in extensionDlls)
{
await LoadFromAssemblyFile(
extensionDll,
kernel,
context);
}
}
private async Task LoadFromAssemblyFile(
FileInfo assemblyFile,
Kernel kernel,
KernelInvocationContext context)
{
bool loadExtensions;
lock (_lock)
{
loadExtensions = _loadedAssemblies.Add(AssemblyName.GetAssemblyName(assemblyFile.FullName));
}
if (loadExtensions)
{
var assembly = AssemblyLoadContext.Default.LoadFromAssemblyPath(assemblyFile.FullName);
var extensionTypes = assembly
.ExportedTypes
.Where(t => t.CanBeInstantiated() && typeof(IKernelExtension).IsAssignableFrom(t))
.ToArray();
if (extensionTypes.Any())
{
context.Display($"Loading extensions from `{assembly.Location}`");
}
foreach (var extensionType in extensionTypes)
{
var extension = (IKernelExtension)Activator.CreateInstance(extensionType);
try
{
await extension.OnLoadAsync(kernel);
context.Publish(new KernelExtensionLoaded(extension, context.Command));
}
catch (Exception e)
{
context.Publish(new ErrorProduced(
$"Failed to load kernel extension \"{extensionType.Name}\" from assembly {assembly.Location}",
context.Command));
context.Fail(context.Command, new KernelExtensionLoadException(e));
}
}
}
}
private async Task LoadFromExtensionDibScriptAsync(
DirectoryInfo directory,
Kernel kernel,
KernelInvocationContext context)
{
var extensionFile = new FileInfo(Path.Combine(directory.FullName, ExtensionScriptName));
if (extensionFile.Exists)
{
var logMessage = $"Loading extension script from `{extensionFile.FullName}`";
using var op = new ConfirmationLogger(
operationName: nameof(LoadFromExtensionDibScriptAsync),
category: Log.Category,
message: logMessage,
logOnStart: true,
args: new object[] { extensionFile });
context.Display(logMessage);
await kernel.LoadAndRunInteractiveDocument(extensionFile, context.Command);
op.Succeed();
}
}
}