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@ -0,0 +1,343 @@
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using System.Reflection;
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using System.Runtime.Versioning;
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using Connected.Host.Configuration;
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using Microsoft.Extensions.DependencyModel;
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using NuGet.Configuration;
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using NuGet.Frameworks;
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using NuGet.Packaging;
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using NuGet.Packaging.Core;
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using NuGet.Packaging.Signing;
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using NuGet.Protocol.Core.Types;
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using NuGet.Resolver;
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using NuGet.Versioning;
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namespace Connected.Host;
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public class DependencyLoader
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{
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/// <summary>
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/// Loads packages from the specified repositories into memory.
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/// </summary>
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/// <param name="packages">A list of package Id and version descriptors to load.</param>
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/// <param name="repositoryLocations">A list of NuGet repositories to check.</param>
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/// <param name="cancellationToken"></param>
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/// <exception cref="InvalidOperationException">Thrown when a package identity could not be resolved.</exception>
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private async Task Load(IEnumerable<MicroServiceDescriptor> packages, IEnumerable<string> repositoryLocations, CancellationToken? cancellationToken = null)
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{
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cancellationToken ??= CancellationToken.None;
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//TODO: Wire up actual logger
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var logger = new NuGet.Common.NullLogger();
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/*
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* Define a source provider with specified sources.
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*/
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var packageSources = GetPackageSources(repositoryLocations);
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/*
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* Define a package source provider with empty settings with the specified package sources.
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*/
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var packageSourceProvider = new PackageSourceProvider(Settings.LoadMachineWideSettings(Settings.DefaultSettingsFileName), packageSources);
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/*
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* Define a repository provider with our package source and the latest API capabilities.
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*/
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var repositoryProvider = new SourceRepositoryProvider(packageSourceProvider, Repository.Provider.GetCoreV3());
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/*
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* Setup contexts for dependency resolution and package downloading.
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* First, the disposable cache
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*/
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using var sourceCacheContext = new SourceCacheContext();
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/*
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* Next, the compatible framework versions.
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*/
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var version = Assembly.GetExecutingAssembly()
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.GetCustomAttributes(typeof(TargetFrameworkAttribute), false)
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.SingleOrDefault() as TargetFrameworkAttribute;
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var targetFramework = NuGetFramework.ParseFrameworkName(version.FrameworkName, DefaultFrameworkNameProvider.Instance);
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/*
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* Complete list of all touched packages, to be filled out by installer and downloader.
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*/
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var allPackages = new HashSet<SourcePackageDependencyInfo>();
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/*
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* Default dependency context.
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*/
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var dependencyContext = DependencyContext.Default;
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/*
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* Extract list of repositories.
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*/
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var repositories = repositoryProvider.GetRepositories();
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/*
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* Get all package identities and packages.
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*/
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foreach (var dependency in packages)
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{
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var packageIdentity = await GetPackageIdentity(dependency, sourceCacheContext, logger, repositories, cancellationToken.Value);
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if (packageIdentity is null)
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throw new InvalidOperationException($"Cannot find package {dependency.Name}.");
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await GetPackageDependencies(packageIdentity, sourceCacheContext, targetFramework, logger, repositories, dependencyContext, allPackages, cancellationToken.Value);
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}
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var packagesToInstall = GetPackagesToInstall(repositoryProvider, logger, packages, allPackages);
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/*
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* Install packages in standard location.
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*/
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var packageDirectory = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location)!, ".packages");
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var nugetSettings = Settings.LoadDefaultSettings(packageDirectory);
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await InstallPackages(sourceCacheContext, logger, packagesToInstall, packageDirectory, nugetSettings, cancellationToken.Value);
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}
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/// <summary>
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/// Installs the list of packages and loads them into memory.
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/// </summary>
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/// <param name="sourceCacheContext">The shared context for resolved packages.</param>
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/// <param name="logger">A standard NuGet logger.</param>
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/// <param name="packagesToInstall">A list of packages to install.</param>
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/// <param name="rootPackagesDirectory">The root directory into which the packages are downloaded and extracted.</param>
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/// <param name="nugetSettings">A set of NuGet settings, containing local repos and download behavior settings.</param>
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/// <param name="cancellationToken"></param>
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private async Task InstallPackages(SourceCacheContext sourceCacheContext, NuGet.Common.ILogger logger,
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IEnumerable<SourcePackageDependencyInfo> packagesToInstall, string rootPackagesDirectory,
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ISettings nugetSettings, CancellationToken cancellationToken)
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{
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var packagePathResolver = new PackagePathResolver(rootPackagesDirectory, true);
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var packageExtractionContext = new PackageExtractionContext(
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PackageSaveMode.Defaultv3,
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XmlDocFileSaveMode.Skip,
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ClientPolicyContext.GetClientPolicy(nugetSettings, logger),
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logger);
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foreach (var package in packagesToInstall)
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{
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var downloadResource = await package.Source.GetResourceAsync<DownloadResource>(cancellationToken);
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/*
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* Download package (from online, local or shared cache).
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*/
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var downloadResult = await downloadResource.GetDownloadResourceResultAsync(
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package,
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new PackageDownloadContext(sourceCacheContext),
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SettingsUtility.GetGlobalPackagesFolder(nugetSettings),
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logger,
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cancellationToken);
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/*
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* Extract package.
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*/
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var extractedFiles = await PackageExtractor.ExtractPackageAsync(
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downloadResult.PackageSource,
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downloadResult.PackageStream,
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packagePathResolver,
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packageExtractionContext,
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cancellationToken);
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/*
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* Install applicable dlls.
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*/
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foreach (var assembly in extractedFiles.Where(e => e.EndsWith(".dll")))
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{
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try
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{
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Assembly.LoadFrom(assembly);
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}
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catch (Exception e)
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{
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logger.LogWarning($"Could not load assembly. {e}");
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}
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}
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}
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}
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/// <summary>
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/// Generates a list of package sources from a list of repository urls.
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/// </summary>
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/// <param name="sources">A list of URIs of specified sources.</param>
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/// <returns>A list of package sources for the specified NuGet repository URIs.</returns>
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private IEnumerable<PackageSource> GetPackageSources(IEnumerable<string> sources)
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{
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foreach (var source in sources)
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yield return new PackageSource(source);
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}
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/// <summary>
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/// Returns a list of missing packages to satisfy all dependencies.
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/// </summary>
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/// <param name="sourceRepositoryProvider">A source repository provider for all resources to load packages from.</param>
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/// <param name="logger">A standard NuGet logger.</param>
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/// <param name="packages">A list of packages for which to resolve all dependencies.</param>
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/// <param name="availablePackages">A list of available packages to resolve from.</param>
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/// <returns></returns>
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private IEnumerable<SourcePackageDependencyInfo> GetPackagesToInstall(SourceRepositoryProvider sourceRepositoryProvider, NuGet.Common.ILogger logger, IEnumerable<MicroServiceDescriptor> packages, HashSet<SourcePackageDependencyInfo> availablePackages)
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{
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/*
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* Create resolver to resolve missing packages
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*/
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var resolverContext = new PackageResolverContext(
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DependencyBehavior.Lowest,
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packages.Select(x => x.Name),
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Enumerable.Empty<string>(),
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Enumerable.Empty<PackageReference>(),
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Enumerable.Empty<PackageIdentity>(),
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availablePackages,
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sourceRepositoryProvider.GetRepositories().Select(s => s.PackageSource),
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logger);
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var packagesToInstall = new PackageResolver()
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.Resolve(resolverContext, CancellationToken.None)
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.Select(p => availablePackages.Single(x => PackageIdentityComparer.Default.Equals(x, p)));
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return packagesToInstall;
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}
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/// <summary>
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/// Resolves a package identity from the supplied Id and version.
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/// </summary>
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/// <param name="microserviceDescriptor">The version and id of the required package.</param>
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/// <param name="cache">The shared cache in which resolved packages are stored.</param>
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/// <param name="nugetLogger">A standard NuGet logger.</param>
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/// <param name="repositories">A list of repositories to check when resolving the package version.</param>
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/// <param name="cancelToken"></param>
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/// <returns>Returns the resolved package identity or null if it could not be resolved.</returns>
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/// <exception cref="InvalidOperationException">Thrown when the version range could not be parsed.</exception>
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private async Task<PackageIdentity?> GetPackageIdentity(MicroServiceDescriptor microserviceDescriptor, SourceCacheContext cache, NuGet.Common.ILogger nugetLogger, IEnumerable<SourceRepository> repositories, CancellationToken cancelToken)
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{
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/*
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* Go through repositories in order.
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*/
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foreach (var sourceRepository in repositories)
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{
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/*
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* Get resource, available versions and attempt to resolve the appropriate version. If none is available, take the last one.
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*/
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var findPackageResource = await sourceRepository.GetResourceAsync<FindPackageByIdResource>();
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var availableVersions = await findPackageResource.GetAllVersionsAsync(microserviceDescriptor.Name, cache, nugetLogger, cancelToken);
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NuGetVersion selected;
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if (microserviceDescriptor.Version is not null)
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{
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if (!VersionRange.TryParse(microserviceDescriptor.Version, out var range))
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throw new InvalidOperationException("Invalid version range provided.");
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var bestVersion = range.FindBestMatch(availableVersions);
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selected = bestVersion;
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}
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else
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selected = availableVersions.LastOrDefault();
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if (selected is not null)
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return new PackageIdentity(microserviceDescriptor.Name, selected);
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}
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return null;
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}
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/// <summary>
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/// Searches the package dependency graph for the chain of all packages to install.
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/// </summary>
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private async Task GetPackageDependencies(PackageIdentity package,
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SourceCacheContext cacheContext,
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NuGetFramework framework,
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NuGet.Common.ILogger logger,
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IEnumerable<SourceRepository> repositories,
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DependencyContext hostDependencies,
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ISet<SourcePackageDependencyInfo> availablePackages,
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CancellationToken cancelToken)
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{
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/*
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* Already present, skip.
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*/
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if (availablePackages.Contains(package))
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return;
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foreach (var sourceRepository in repositories)
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{
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/*
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* Get dependency info.
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*/
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var dependencyInfoResource = await sourceRepository.GetResourceAsync<DependencyInfoResource>();
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var dependencyInfo = await dependencyInfoResource.ResolvePackage(
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package,
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framework,
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cacheContext,
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logger,
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cancelToken);
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if (dependencyInfo is null)
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continue;
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/*
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* Only return packages not provided by the host.
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*/
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var sourceDependencies = new SourcePackageDependencyInfo(
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dependencyInfo.Id,
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dependencyInfo.Version,
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dependencyInfo.Dependencies.Where(dependency => !DependencySuppliedByHost(hostDependencies, dependency)),
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dependencyInfo.Listed,
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dependencyInfo.Source);
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availablePackages.Add(sourceDependencies);
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/*
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* Get the dependency's packages.
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*/
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foreach (var dependency in sourceDependencies.Dependencies)
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{
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await GetPackageDependencies(
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new PackageIdentity(dependency.Id, dependency.VersionRange.MinVersion),
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cacheContext,
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framework,
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logger,
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repositories,
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hostDependencies,
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availablePackages,
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cancelToken);
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}
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break;
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}
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}
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/// <summary>
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/// Checks if a package dependency is already provided by the host.
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/// </summary>
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/// <param name="hostDependencies">The context packages.</param>
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/// <param name="dependency">The dependency to check for.</param>
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/// <returns>True if the host provides the dependency, false otherwise.</returns>
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private bool DependencySuppliedByHost(DependencyContext hostDependencies, PackageDependency dependency)
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{
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/*
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* Check runtimes for package with same id.
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*/
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var runtimeLib = hostDependencies.RuntimeLibraries.FirstOrDefault(r => r.Name == dependency.Id);
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if (runtimeLib is null)
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return false;
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/*
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* Check for version compatibility.
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*/
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var parsedLibVersion = NuGetVersion.Parse(runtimeLib.Version);
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if (parsedLibVersion.IsPrerelease)
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/*
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* Latest and greatest. Always accept due to system compatiblity reasons.
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*/
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return true;
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/*
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* Check for version compatibility.
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*/
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return dependency.VersionRange.Satisfies(parsedLibVersion);
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}
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/// <summary>
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/// Loads packages from the specified repositories into memory.
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/// </summary>
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/// <param name="packages">A list of package Id and version descriptors to load.</param>
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/// <param name="repositories">A list of NuGet repositories to check.</param>
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internal static async Task LoadPackages(IEnumerable<MicroServiceDescriptor> packages, IEnumerable<string> repositories)
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{
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await new DependencyLoader().Load(packages, repositories);
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}
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}
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Matija Koželj