dotpython/src/DotPython.Worker.Host/WorkerSessionState.cs at main · kidoz/dotpython · GitHub

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using DotPython.Runtime.Managed.Execution;

using DotPython.Runtime.Native;

namespace DotPython.Worker.Host;

internal sealed class WorkerSessionState : IAsyncDisposable

{

private readonly NativeExecutionLane _nativeLane = new();

private readonly Dictionary<long, StableAbiModule> _nativeModules = [];

private readonly List<long> _nativeOrder = [];

private readonly Dictionary<string, StableAbiModuleCatalogEntry> _stableAbiModules;

private readonly Dictionary<string, long> _boundNativeObjectIds = new(StringComparer.Ordinal);

private long _nextObjectId;

private int _disposed;

internal WorkerSessionState(

IReadOnlyList<string> packageRoots,

IReadOnlyList<StableAbiModuleCatalogEntry> stableAbiModules

)

{

ArgumentNullException.ThrowIfNull(packageRoots);

ArgumentNullException.ThrowIfNull(stableAbiModules);

_stableAbiModules = stableAbiModules.ToDictionary(

entry => entry.Manifest.ModuleName,

StringComparer.Ordinal

);

foreach (var entry in stableAbiModules)

{

ValidateQualifiedPackage(packageRoots, entry.Configuration, entry.Manifest);

}

Engine =

packageRoots.Count == 0

? new ManagedPythonEngine()

: new ManagedPythonEngine(

new ManagedModuleDiscoveryOptions

{

SearchPaths = packageRoots,

NativeExtensionResolver = ResolveNativeExtension,

}

);

}

internal ManagedPythonEngine Engine { get; }

private Task<long> LoadStableAbiModuleAsync(

StableAbiModuleConfiguration configuration,

CancellationToken cancellationToken

) =>

_nativeLane.InvokeAsync(

() =>

{

var module = StableAbiModuleLoader.Load(configuration);

var objectId = checked(++_nextObjectId);

_nativeModules.Add(objectId, module);

_nativeOrder.Add(objectId);

return objectId;

cancellationToken

);

public async ValueTask DisposeAsync()

{

if (Interlocked.Exchange(ref _disposed, 1) != 0)

{

return;

}

_ = await _nativeLane

.InvokeAsync(

() =>

{

for (var index = _nativeOrder.Count - 1; index >= 0; index--)

{

_nativeModules[_nativeOrder[index]].Dispose();

}

_nativeModules.Clear();

_nativeOrder.Clear();

return true;

CancellationToken.None

)

.ConfigureAwait(false);

await _nativeLane.DisposeAsync().ConfigureAwait(false);

}

private StableAbiModule GetModule(long objectId)

{

if (!_nativeModules.TryGetValue(objectId, out var module))

{

throw new StableAbiLoadException(

"DPY8106",

StableAbiLoadPhase.Invocation,

"The native module handle is not active.",

artifactPath: null,

artifactSha256: null,

missingSymbol: null

);

}

return module;

}

internal T InvokeNative<T>(Func<T> operation) =>

_nativeLane.InvokeAsync(operation, CancellationToken.None).GetAwaiter().GetResult();

private Action<PythonGlobalNamespace>? ResolveNativeExtension(string name, string path)

{

if (!_stableAbiModules.TryGetValue(name, out var entry))

{

return null;

}

var comparison = OperatingSystem.IsWindows()

? StringComparison.OrdinalIgnoreCase

: StringComparison.Ordinal;

if (

!string.Equals(

Path.GetFullPath(path),

Path.GetFullPath(entry.Configuration.ModulePath),

comparison

)

{

throw new InvalidDataException(

$"Qualified native module '{name}' resolved to an artifact other than its configured path."

);

}

return globals => InitializeNativeExtension(entry, globals);

}

private void InitializeNativeExtension(

StableAbiModuleCatalogEntry entry,

PythonGlobalNamespace globals

)

{

if (_boundNativeObjectIds.ContainsKey(entry.Manifest.ModuleName))

{

throw new PythonRuntimeException(

"DPY4029",

"The qualified native module cannot be initialized in this session.",

default,

"ImportError"

);

}

try

{

var objectId = LoadStableAbiModuleAsync(entry.Configuration, CancellationToken.None)

.GetAwaiter()

.GetResult();

_boundNativeObjectIds.Add(entry.Manifest.ModuleName, objectId);

var exports = InvokeNative(() =>

{

var module = GetModule(objectId);

return module

.GetAttributeNames()

.Where(name =>

entry.Manifest.AllowedMethods.Contains(name, StringComparer.Ordinal)

)

.Select(name => new KeyValuePair<string, PythonValue>(

name,

QualifiedStableAbiObjectProtocol.ToManaged(this, module.GetAttribute(name))

))

.ToArray();

});

foreach (var export in exports)

{

globals.SetValue(export.Key, export.Value);

}

catch (StableAbiLoadException exception)

{

throw new PythonRuntimeException(

exception.Code,

exception.Message,

default,

"ImportError"

);

}

private static void ValidateQualifiedPackage(

IReadOnlyList<string> packageRoots,

StableAbiModuleConfiguration configuration,

StableAbiSymbolManifest manifest

)

{

if (

manifest.NativeEntry is null

|| manifest.PackageInitializer is null

|| manifest.PackageInitializerSha256 is null

|| manifest.PackageMetadata is null

|| manifest.PackageMetadataSha256 is null

)

{

return;

}

var comparison = OperatingSystem.IsWindows()

? StringComparison.OrdinalIgnoreCase

: StringComparison.Ordinal;

var packageRoot = packageRoots.FirstOrDefault(root =>

string.Equals(

Path.GetFullPath(Path.Combine(root, manifest.NativeEntry)),

Path.GetFullPath(configuration.ModulePath),

comparison

)

);

if (packageRoot is null)

{

return;

}

ValidatePackageFile(

packageRoot,

manifest.PackageInitializer,

manifest.PackageInitializerSha256

);

ValidatePackageFile(packageRoot, manifest.PackageMetadata, manifest.PackageMetadataSha256);

}

private static void ValidatePackageFile(

string packageRoot,

string relativePath,

string expectedSha256

)

{

var root = Path.TrimEndingDirectorySeparator(Path.GetFullPath(packageRoot));

var path = Path.GetFullPath(Path.Combine(root, relativePath));

var comparison = OperatingSystem.IsWindows()

? StringComparison.OrdinalIgnoreCase

: StringComparison.Ordinal;

if (!path.StartsWith(root + Path.DirectorySeparatorChar, comparison) || !File.Exists(path))

{

throw PackagePolicyFailure(path, "A qualified package file is missing.");

}

var file = new FileInfo(path);

if (

file.LinkTarget is not null

|| (file.Attributes & FileAttributes.ReparsePoint) != 0

|| !string.Equals(

StableAbiModuleLoader.ComputeSha256(path),

expectedSha256,

StringComparison.Ordinal

)

{

throw PackagePolicyFailure(

path,

"A qualified package file failed identity validation."

);

}

private static StableAbiLoadException PackagePolicyFailure(string path, string message) =>

new(

"DPY8001",

StableAbiLoadPhase.Policy,

message,

path,

artifactSha256: null,

missingSymbol: null

);

}

dotpython/src/DotPython.Worker.Host/WorkerSessionState.cs at main · kidoz/dotpython · GitHub

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