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C#•2mo ago

Choosing what architecture NuGet.Protocol Downloads

Hi there! I'm working on a sort of addon-like system for one of my project, and would like to handle addon's dependencies using NuGet repositories. Right now, I'm downloading the DLLs requested by an addon (for instance in my test, it was SpacedGrid-Avalonia version 11.0.0) into a folder, then loading the DLLs using Assembly#Load. However, when calling this method, I'm getting a Bad IL Format, which I guess means the downloaded DLLs was not for the right machine arch. Here's my code for downloading from NuGet repos:

using var packageStream = new MemoryStream();

await resource.CopyNupkgToStreamAsync(
    dependencyName, latestVersion,
    packageStream, cache, 
    NullLogger.Instance, default);

var folder = Path.Combine(AppConfig.AppDataFolderPath, "Addons", "Dependencies");
if (!Directory.Exists(folder)) Directory.CreateDirectory(folder);

var filePath = Path.Combine(folder, $"{dependencyName}_{latestVersion}.dll");
await File.WriteAllBytesAsync(filePath, packageStream.ToArray());

using var packageStream = new MemoryStream();

await resource.CopyNupkgToStreamAsync(
    dependencyName, latestVersion,
    packageStream, cache, 
    NullLogger.Instance, default);

var folder = Path.Combine(AppConfig.AppDataFolderPath, "Addons", "Dependencies");
if (!Directory.Exists(folder)) Directory.CreateDirectory(folder);

var filePath = Path.Combine(folder, $"{dependencyName}_{latestVersion}.dll");
await File.WriteAllBytesAsync(filePath, packageStream.ToArray());

75 Replies

reflectronic•2mo ago

what exactly do you do with the file that you write?

Sky•2mo ago

I load it using Assembly.Load

reflectronic•2mo ago

yes, that will not work a nupkg isn't an assembly

Sky•2mo ago

I also tried LoadFromFile, but it stills throw me the "Bad IL"

reflectronic•2mo ago

it's a zip file

Sky•2mo ago

well the file the code downloads is a dll oh I think I get what you mean Ohh okay I am very stupid

reflectronic•2mo ago

i can assure you CopyNupkgToStreamAsync does not download a DLL. i mean, it says in the name, it downloads a nupkg if you open that file in a program like 7-zip you will see it has some directories and a bunch of files in it

Sky•2mo ago

yup sorry, I convinced myself it was a dll after looking at the downlaoded file 😭

reflectronic•2mo ago

one (or even more) of those files is a DLL it is somewhat difficult to select the right DLL from the nupkg

Sky•2mo ago

So once downloaded, I have to unpack the Nupkg file right? ah, because of the different frameworks?

reflectronic•2mo ago

yes, mainly i am pretty sure there are APIs in the nuget client to select the right DLL, though i don't know what they are

Sky•2mo ago

Gotcha, I'll dig into this more now I'm getting the error 😂 Thanks for the help :Lovely:

reflectronic•2mo ago

i think https://github.com/waf/CSharpRepl/blob/main/CSharpRepl.Services/Nuget/NugetPackageInstaller.cs is a good example of what needs to be done, the code is kinda complicated, but you can see what it does starting from "InstallAsync" the implementation of GetRuntimeGraph is kinda shitty, i would not have done it that way, it might not work for you. otherwise, the code is pretty easily adapted to whatever you need

Sky•2mo ago

Oki! I got it working, loading the DLL is no longer a problem However, I am doing the "same thing" (I mean loading a dll, and this time I'm sure it's one lmao) for my addon system, however even if I load the dependency before the addon's dll, it cannot found the dependency's DLL Tried with the exact same version as well (of the dependency I mean) and nope, I'm getting the whole

System.IO.FileNotFoundException: Could not load file or assembly 'SpacedGridControl.Avalonia, Version=11.0.0.2, Culture=neutral, PublicKeyToken=null'. Le fichier spécifié est introuvable.

reflectronic•2mo ago

what are you passing to Assembly.Load to be clear, it does not take a file path

Sky•2mo ago

for loading the dep or addon? yea I'm passing a stream iirc

var dependencyPath = Path.Combine(AppConfig.AppDataFolderPath, "Addons", "Dependencies", $"{dependencyName}_{versionToLoad}.dll");
SkEditorAPI.Logs.Debug("Loading dependency: " + dependencyPath + " version: " + versionToLoad + "...");
try
{
    Assembly.LoadFile(dependencyPath);
}
catch (Exception e)
{
    SkEditorAPI.Logs.Error($"Failed to load dependency {dependencyName} from {dependencyPath}: {e.Message}");
    addonMeta.Errors.Add(LoadingErrors.FailedToLoadDependency(dependencyName, e.Message));
    return false;
}

var dependencyPath = Path.Combine(AppConfig.AppDataFolderPath, "Addons", "Dependencies", $"{dependencyName}_{versionToLoad}.dll");
SkEditorAPI.Logs.Debug("Loading dependency: " + dependencyPath + " version: " + versionToLoad + "...");
try
{
    Assembly.LoadFile(dependencyPath);
}
catch (Exception e)
{
    SkEditorAPI.Logs.Error($"Failed to load dependency {dependencyName} from {dependencyPath}: {e.Message}");
    addonMeta.Errors.Add(LoadingErrors.FailedToLoadDependency(dependencyName, e.Message));
    return false;
}

That's for the dependency (using LoadFile instead to see if it changed anything but nope) and yea for addon I'm just passing a stream Assembly.Load(await File.ReadAllBytesAsync(addonDllFile))

reflectronic•2mo ago

you will have to explain more about this plugin system are you using AssemblyLoadContext?

Sky•2mo ago

not at all should I? x)

reflectronic•2mo ago

yes, probably

reflectronic•2mo ago

there is an article about it here https://learn.microsoft.com/en-us/dotnet/core/tutorials/creating-app-with-plugin-support

Create a .NET Core application with plugins - .NET

Learn how to create a .NET Core application that supports plugins.

reflectronic•2mo ago

AssemblyLoadContext allows the plugins to not conflict with each other

Sky•2mo ago

owh sweet thanks 👍

reflectronic•2mo ago

and, i am not really sure what you need this nuget thing for--if it's just because your pluigin depends on this library, i think the article proposes a much easier way to do it

Sky•2mo ago

well it's to let addons use dependecies that are not in my program and as dlls cannot be "combined" I though it was the only way

reflectronic•2mo ago

they cannot be combined, the way the article proposes is to use a folder instead the folder contains the plugin and all of the DLLs it uses and there is a .deps.json file which will tell the plugin loader exactly what is what

Sky•2mo ago

so if people (normal users I mean) wanna add a plugin, they'll have to put a whole folder? well a zip technically

reflectronic•2mo ago

in case the plugin has dependencies, yes, downloading a zip and extracting it as a folder somewhere would be the way to do it i think it is going to be much easier and less problematic than trying to implement some kind of dependency loader yourself

Sky•2mo ago

Hum well actually I'll end up with the same problem cuz at the end in both situation I have DLLs to load (dependencies I mean)

reflectronic•2mo ago

yes, but, the API handles it for you https://learn.microsoft.com/en-us/dotnet/core/tutorials/creating-app-with-plugin-support#load-plugins the AssemblyDependencyResolver thing finds the dependency DLLs which are next to the plugin

Sky•2mo ago

Ohh

reflectronic•2mo ago

so, when the plugin tries to find SpacedGridControl.Avalonia (for example), it calls into the PluginLoadContext object you made for that plugin it calls your override of Load, and you can do any logic you want in there

Sky•2mo ago

Oki, I reworked my logic behind, but I still have the same error

Sky•2mo ago

No description

Sky•2mo ago

Now both the addon & dep are in the same folder

var folder = Path.Combine(AppConfig.AppDataFolderPath, "Addons");
var folders = Directory.GetDirectories(folder);
var dllFiles = new List<string>();
foreach (string sub in folders)
    dllFiles.Add(Path.Combine(sub, Path.GetFileName(sub) + ".dll"));

var folder = Path.Combine(AppConfig.AppDataFolderPath, "Addons");
var folders = Directory.GetDirectories(folder);
var dllFiles = new List<string>();
foreach (string sub in folders)
    dllFiles.Add(Path.Combine(sub, Path.GetFileName(sub) + ".dll"));

Here's how I gather the addon's dll files And for each, I'm loading it this way:

AddonLoadContext loadContext = new AddonLoadContext(Path.GetFullPath(addonDllFile));
addon = loadContext.LoadFromAssemblyName(new AssemblyName(Path.GetFileNameWithoutExtension(addonDllFile)))
    .GetTypes()
    .Where(p => typeof(IAddon).IsAssignableFrom(p) && p is { IsClass: true, IsAbstract: false })
    .Select(addonType => (IAddon)Activator.CreateInstance(addonType))
    .ToList();

AddonLoadContext loadContext = new AddonLoadContext(Path.GetFullPath(addonDllFile));
addon = loadContext.LoadFromAssemblyName(new AssemblyName(Path.GetFileNameWithoutExtension(addonDllFile)))
    .GetTypes()
    .Where(p => typeof(IAddon).IsAssignableFrom(p) && p is { IsClass: true, IsAbstract: false })
    .Select(addonType => (IAddon)Activator.CreateInstance(addonType))
    .ToList();

public class AddonLoadContext : AssemblyLoadContext
{
    
    private readonly AssemblyDependencyResolver _resolver;

    public AddonLoadContext(string pluginPath)
    {
        _resolver = new AssemblyDependencyResolver(pluginPath);
    }

    protected override Assembly Load(AssemblyName assemblyName)
    {
        var assemblyPath = _resolver.ResolveAssemblyToPath(assemblyName);
        return assemblyPath != null ? LoadFromAssemblyPath(assemblyPath) : null;
    }

    protected override IntPtr LoadUnmanagedDll(string unmanagedDllName)
    {
        var libraryPath = _resolver.ResolveUnmanagedDllToPath(unmanagedDllName);
        return libraryPath != null ? LoadUnmanagedDllFromPath(libraryPath) : IntPtr.Zero;
    }
    
}

public class AddonLoadContext : AssemblyLoadContext
{
    
    private readonly AssemblyDependencyResolver _resolver;

    public AddonLoadContext(string pluginPath)
    {
        _resolver = new AssemblyDependencyResolver(pluginPath);
    }

    protected override Assembly Load(AssemblyName assemblyName)
    {
        var assemblyPath = _resolver.ResolveAssemblyToPath(assemblyName);
        return assemblyPath != null ? LoadFromAssemblyPath(assemblyPath) : null;
    }

    protected override IntPtr LoadUnmanagedDll(string unmanagedDllName)
    {
        var libraryPath = _resolver.ResolveUnmanagedDllToPath(unmanagedDllName);
        return libraryPath != null ? LoadUnmanagedDllFromPath(libraryPath) : IntPtr.Zero;
    }
    
}

I'm not sure if I did something wrong this time x)

reflectronic•2mo ago

you need to build the addon so that it copies its dependencies and generates the dependency file so, in your SdkEditorTestAddon.dll, you need to add this to your csproj:

<EnableDynamicLoading>true</EnableDynamicLoading>

<EnableDynamicLoading>true</EnableDynamicLoading>

then, try building it again, and look at the build output (it might not be fully right, so, can you send a picture of it)

Sky•2mo ago

well the problem is that he also generates dll for libs that are already in my app

Sky•2mo ago

No description

reflectronic•2mo ago

ok, so, you have <ProjectReference Include="MyApp.csproj" /> somewhere in ther change it to <ProjectReference Include="MyApp.csproj" Private="false" ExcludeAssets="runtime" /> this will tell your plugin to not depend on any of the app's libaries even though you have referenced it

Sky•2mo ago

you'll beat me, but I was referencing each deps ;-;

reflectronic•2mo ago

what do you mean no, it's OK that you use the libraries in the plugin it just will not copy them to the build output sorry i was not clear

Sky•2mo ago

No description

Sky•2mo ago

I got this for all other libs, referencing their DLLs

reflectronic•2mo ago

oh is there a reason you are not doing ProjectReference instead

Sky•2mo ago

Because I am stupid :blobsweat: Although it's been a solid time I code with C#, its whole env is a bit new to me while I'm used to Gradle with Java, so it's even harder to move on

Sky•2mo ago

Okay, using the project reference i'm getting some unresolved deps from the addon

No description

reflectronic•2mo ago

uh, would you mind showing the csproj file you have for the main program

Sky•2mo ago

yessir

Sky•2mo ago

SkEditor.csproj

Sky•2mo ago

Thanks for the time you're taking to help be btw :love:

reflectronic•2mo ago

if you try doing dotnet build on the plugin does it have the same errors

Sky•2mo ago

huh, nope, all I get is warnings but I think it got built correctly

reflectronic•2mo ago

maybe try restarting rider

Sky•2mo ago

WHAT all the errors from Rider disapeared 🤣

reflectronic•2mo ago

it is probably just a little bit confused

Sky•2mo ago

ahh the csproj got restored, it's maybe beacsue of that? the app's one I mean

reflectronic•2mo ago

yeah that is probably what happened

Sky•2mo ago

ahh sorry, didn't think about it :blobsweat:

reflectronic•2mo ago

ok, anyway, when you look at the build output for the plugin, what does it look like

Sky•2mo ago

No description

Sky•2mo ago

I'm getting all of this

reflectronic•2mo ago

hm. this is a somewhat unpleasant situation

Sky•2mo ago

Oh :pandaSob:

reflectronic•2mo ago

does adding <PackageReference Include="Avalonia" Version="11.0.0" ExcludeAssets="runtime" /> remove all of the avalonia DLLs

Sky•2mo ago

yup, got a lot less

No description

reflectronic•2mo ago

you will have to add

<PackageReference Include="Avalonia" Version="11.0.10" ExcludeAssets="runtime" /> 
<PackageReference Include="MicroCom.Runtime" Version="0.11.0" ExcludeAssets="runtime" />
<PackageReference Include="Avalonia.Remote.Protocol" Version="11.0.10" ExcludeAssets="runtime" />

<PackageReference Include="Avalonia" Version="11.0.10" ExcludeAssets="runtime" /> 
<PackageReference Include="MicroCom.Runtime" Version="0.11.0" ExcludeAssets="runtime" />
<PackageReference Include="Avalonia.Remote.Protocol" Version="11.0.10" ExcludeAssets="runtime" />

to your project file to remove all of the avalonia DLLs that shouldn't be there unfortunately i don't think there is a good way to do it automatically

Sky•2mo ago

Got it In my case rn I'm using local things, but I plan to put my project on nuget for easier use will those still be required? yup that worked btw Thanks again!

reflectronic•2mo ago

i do not think it is needed--i think the DLLs will just be ignored if they are there the problem is that, when you reference SpacedGridControl.Avalonia, it thinks you also need all of Avalonia but you do not, because it comes with the plugin host so, it will copy the DLLs. they will be ignored, because it will always choose the DLLs from the plugin host anyway. so, it doesn't cause any harm. but it is kind of unclean. and writing ExcludeAssets is the only way to fix it currentlly

Sky•2mo ago

ohh oki I see sort of conflicts from two sources

reflectronic•2mo ago

yes anyway, now you can copy that build output folder to the folder for the plugin and it should just work

Sky•2mo ago

Yup it worked like a charm! Thanks you very much 👍

Sky•2mo ago

welp, me again, I think I'm too much used to Java's generic types, but I am getting something wrong here? :thonk:

No description

No description

reflectronic•2mo ago

yes, it is not possible even if you declared ISettingType<out T> using out because bool is a value type, variance conversions do not work

Sky•2mo ago

There's nothing similar to ? for generic types in C#?

reflectronic•2mo ago

no, there are no wildcards

Sky•2mo ago

hum got it, thanks 👍 I think i'll just use object in this case i mean without any generic type xD

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