public virtual NativeAssembly LoadUnmanagedDll(
string initialPluginLoadDirectory,
string unmanagedDllName,
IPluginDependencyContext pluginDependencyContext,
Func <string, string, ValueOrProceed <string> > loadFromDependencyContext,
Func <string, string, ValueOrProceed <string> > loadFromRemote,
Func <string, string, ValueOrProceed <IntPtr> > loadFromAppDomain)
{
ValueOrProceed <string> valueOrProceed = ValueOrProceed <string> .FromValue(String.Empty, true);
ValueOrProceed <IntPtr> ptrValueOrProceed = ValueOrProceed <IntPtr> .FromValue(IntPtr.Zero, true);
valueOrProceed = loadFromDependencyContext(initialPluginLoadDirectory, unmanagedDllName);
if (valueOrProceed.CanProceed)
{
ptrValueOrProceed = loadFromAppDomain(initialPluginLoadDirectory, unmanagedDllName);
}
if (valueOrProceed.CanProceed && ptrValueOrProceed.CanProceed)
{
valueOrProceed = loadFromRemote(initialPluginLoadDirectory, unmanagedDllName);
}
return(NativeAssembly.Create(valueOrProceed.Value, ptrValueOrProceed.Value));
}
protected virtual ValueOrProceed <AssemblyFromStrategy> LoadFromRemote(string initialPluginLoadDirectory, AssemblyName assemblyName)
{
var assemblyFileName = $"{assemblyName.Name}.dll";
if (this.fileSystemUtilities.DoesFileExist(Path.Combine(initialPluginLoadDirectory, assemblyFileName)))
{
return(LoadDependencyFromLocalDisk(initialPluginLoadDirectory, assemblyFileName));
}
return(ValueOrProceed <AssemblyFromStrategy> .Proceed());
}
protected virtual ValueOrProceed <IntPtr> LoadUnmanagedFromDefault(string initialPluginLoadDirectory, string unmanagedDllName)
{
var resolution = base.LoadUnmanagedDll(unmanagedDllName);
if (resolution == default(IntPtr))
{
return(ValueOrProceed <IntPtr> .Proceed());
}
return(ValueOrProceed <IntPtr> .FromValue(resolution, false));
}
protected virtual ValueOrProceed <string> LoadUnmanagedFromRemote(string initialPluginLoadDirectory, string unmanagedDllName)
{
var assemblyFileName = $"{unmanagedDllName}.dll";
var pathToDependency = Path.Combine(initialPluginLoadDirectory, assemblyFileName);
if (this.fileSystemUtilities.DoesFileExist(pathToDependency))
{
return(ValueOrProceed <string> .FromValue(pathToDependency, false));
}
return(ValueOrProceed <string> .FromValue(String.Empty, true));
}
protected virtual ValueOrProceed <AssemblyFromStrategy> LoadDependencyFromLocalDisk(string directory, string assemblyFileName)
{
var dependency = this.fileSystemUtilities.ReadDependencyFileFromDisk(directory, assemblyFileName);
if (dependency == null)
{
return(ValueOrProceed <AssemblyFromStrategy> .Proceed());
}
return(ValueOrProceed <AssemblyFromStrategy> .FromValue(AssemblyFromStrategy.Releasable(Assembly.Load(this.fileSystemUtilities.ToByteArray(dependency))), false));
}
public virtual AssemblyFromStrategy LoadAssembly(
string initialPluginLoadDirectory,
AssemblyName assemblyName,
IPluginDependencyContext pluginDependencyContext,
Func <string, AssemblyName, ValueOrProceed <AssemblyFromStrategy> > loadFromDependencyContext,
Func <string, AssemblyName, ValueOrProceed <AssemblyFromStrategy> > loadFromRemote,
Func <string, AssemblyName, ValueOrProceed <RuntimeAssemblyShim> > loadFromAppDomain)
{
if (assemblyName.Name == null)
{
return(null);
}
Debug.WriteLine($"{initialPluginLoadDirectory} Loading {assemblyName.Name} {assemblyName.Version}");
ValueOrProceed <AssemblyFromStrategy> valueOrProceed = ValueOrProceed <AssemblyFromStrategy> .FromValue(null, true);
var isHostAssembly = IsHostAssembly(assemblyName, pluginDependencyContext);
var isRemoteAssembly = IsRemoteAssembly(assemblyName, pluginDependencyContext);
if (isHostAssembly && !isRemoteAssembly) // Load from Default App Domain (host)
{
Debug.WriteLine($"{initialPluginLoadDirectory} Loading {assemblyName.Name} {assemblyName.Version} from appDomain");
var assemblyShim = loadFromAppDomain(initialPluginLoadDirectory, assemblyName);
if (assemblyShim.Value != null)
{
switch (assemblyShim.Value.RuntimeLoadFlag)
{
case RuntimeLoadFlag.FromRequestedVersion:
return(null); // fallback to default loading mechanism
case RuntimeLoadFlag.FromRuntimeVersion:
return(AssemblyFromStrategy.NotReleasable(assemblyShim.Value.Assembly));
}
}
}
if (valueOrProceed.CanProceed)
{
valueOrProceed = loadFromDependencyContext(initialPluginLoadDirectory, assemblyName);
}
Debug.WriteLineIf(!valueOrProceed.CanProceed, $"{initialPluginLoadDirectory} Loaded {assemblyName.Name} {assemblyName.Version} from dependency context");
if (valueOrProceed.CanProceed)
{
valueOrProceed = loadFromRemote(initialPluginLoadDirectory, assemblyName);
Debug.WriteLineIf(!valueOrProceed.CanProceed, $"{initialPluginLoadDirectory} Loaded {assemblyName.Name} {assemblyName.Version} from remote");
}
return(valueOrProceed.Value);
}
// <summary>
/// This override includes the netcore 3.0 resolver
/// </summary>
/// <param name="assemblyName"></param>
/// <returns></returns>
protected ValueOrProceed <AssemblyFromStrategy> LoadFromDependencyContext(string initialPluginLoadDirectory, AssemblyName assemblyName)
{
var assemblyPath = this.resolver.ResolveAssemblyToPath(assemblyName);
if (!String.IsNullOrEmpty(assemblyPath) && this.fileSystemUtilities.DoesFileExist(assemblyPath))
{
return(ValueOrProceed <AssemblyFromStrategy> .FromValue(AssemblyFromStrategy.Releasable(LoadFromAssemblyPath(assemblyPath)), false));
}
if (IsResourceAssembly(assemblyName))
{
foreach (var resourceDependency in this.pluginDependencyContext.PluginResourceDependencies)
{
var resourcePath = Path.Combine(resourceDependency.Path, assemblyName.CultureName, assemblyName.Name + ".dll");
if (this.fileSystemUtilities.DoesFileExist(resourcePath))
{
return(ValueOrProceed <AssemblyFromStrategy> .FromValue(AssemblyFromStrategy.Releasable(LoadFromAssemblyPath(resourcePath)), false));
}
}
// Do not proceed probing
return(ValueOrProceed <AssemblyFromStrategy> .FromValue(null, false));
}
var pluginDependency = this.pluginDependencyContext.PluginDependencies.FirstOrDefault(d => d.DependencyNameWithoutExtension == assemblyName.Name);
if (pluginDependency != null)
{
var dependency = this.pluginDependencyResolver.ResolvePluginDependencyToPath(initialPluginLoadDirectory, pluginDependency, this.pluginDependencyContext.AdditionalProbingPaths);
if (dependency != null)
{
return(ValueOrProceed <AssemblyFromStrategy> .FromValue(AssemblyFromStrategy.Releasable(LoadFromStream(dependency)), false));
}
}
var localFile = Path.Combine(initialPluginLoadDirectory, assemblyName.Name + ".dll");
if (this.fileSystemUtilities.DoesFileExist(localFile))
{
return(ValueOrProceed <AssemblyFromStrategy> .FromValue(AssemblyFromStrategy.Releasable(LoadFromAssemblyPath(localFile)), false));
}
return(ValueOrProceed <AssemblyFromStrategy> .Proceed());
}
/// <summary>
/// This override includes the netcore 3.0 resolver
/// </summary>
/// <param name="unmanagedDllName"></param>
/// <returns></returns>
protected ValueOrProceed <string> LoadUnmanagedFromDependencyContext(string initialPluginLoadDirectory, string unmanagedDllName)
{
string libraryPath = this.resolver.ResolveUnmanagedDllToPath(unmanagedDllName);
if (!String.IsNullOrEmpty(libraryPath))
{
string runtimeCandidate = null;
if (this.nativeDependencyLoadPreference == NativeDependencyLoadPreference.PreferInstalledRuntime)
{
// Prefer loading from runtime folder
runtimeCandidate = this.pluginDependencyResolver.ResolvePlatformDependencyPathToRuntime(this.pluginPlatformVersion, libraryPath);
}
return(ValueOrProceed <string> .FromValue(runtimeCandidate ?? libraryPath, false));
}
var unmanagedDllNameWithoutFileExtension = Path.GetFileNameWithoutExtension(unmanagedDllName);
var platformDependency = this.pluginDependencyContext.PlatformDependencies.FirstOrDefault(d => d.DependencyNameWithoutExtension == unmanagedDllNameWithoutFileExtension);
if (platformDependency != null)
{
var pathToDependency = this.pluginDependencyResolver.ResolvePlatformDependencyToPath(initialPluginLoadDirectory, platformDependency, this.pluginDependencyContext.AdditionalProbingPaths);
if (!String.IsNullOrEmpty(pathToDependency))
{
string runtimeCandidate = null;
if (this.nativeDependencyLoadPreference == NativeDependencyLoadPreference.PreferInstalledRuntime)
{
// Prefer loading from runtime folder
runtimeCandidate = this.pluginDependencyResolver.ResolvePlatformDependencyPathToRuntime(this.pluginPlatformVersion, pathToDependency);
}
return(ValueOrProceed <string> .FromValue(runtimeCandidate ?? pathToDependency, false));
}
}
return(ValueOrProceed <string> .FromValue(String.Empty, true));
}
protected virtual ValueOrProceed <RuntimeAssemblyShim> LoadFromDefaultContext(string initialPluginLoadDirectory, AssemblyName assemblyName)
{
try
{
var assemblyShim = this.runtimeDefaultAssemblyLoadContext.LoadFromDefaultContext(assemblyName);
if (assemblyShim != null)
{
return(ValueOrProceed <RuntimeAssemblyShim> .FromValue(assemblyShim, false));
}
}
catch (FileNotFoundException) { } // This can happen if the plugin uses a newer version of a package referenced in the host
var hostAssembly = this.pluginDependencyContext.HostDependencies.FirstOrDefault(h => h.DependencyName.Name == assemblyName.Name);
if (hostAssembly != null && !hostAssembly.AllowDowngrade)
{
if (!hostAssembly.AllowDowngrade)
{
throw new AssemblyLoadingException($"Plugin Assembly reference {assemblyName.Name} with version {assemblyName.Version} was requested but not found in the host. The version from the host is {hostAssembly.DependencyName.Version}. Possible version mismatch. Please downgrade your plugin or add {assemblyName.Name} to downgradableHostAssemblies.");
}
}
return(ValueOrProceed <RuntimeAssemblyShim> .Proceed());
}