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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using Microsoft.Extensions.DependencyModel;
namespace Microsoft.DotNet.Cli.Utils;
/// <summary>
/// Represents the .deps.json file in the shared framework
/// that the CLI is running against.
/// </summary>
internal class FrameworkDependencyFile
{
private readonly string? _depsFilePath;
private readonly Lazy<DependencyContext> _dependencyContext;
private DependencyContext DependencyContext => _dependencyContext.Value;
public FrameworkDependencyFile()
{
_depsFilePath = Muxer.GetDataFromAppDomain("FX_DEPS_FILE");
_dependencyContext = new Lazy<DependencyContext>(CreateDependencyContext);
}
public bool IsRuntimeSupported(string runtimeIdentifier)
{
return DependencyContext.RuntimeGraph.Any(g => g.Runtime == runtimeIdentifier);
}
public string? GetNetStandardLibraryVersion()
{
return DependencyContext
.RuntimeLibraries
.FirstOrDefault(l => "netstandard.library".Equals(l.Name, StringComparison.OrdinalIgnoreCase))
?.Version;
}
#if NETCOREAPP
public bool TryGetMostFitRuntimeIdentifier(
string alternativeCurrentRuntimeIdentifier,
string[] candidateRuntimeIdentifiers,
out string? mostFitRuntimeIdentifier)
{
return TryGetMostFitRuntimeIdentifier(
RuntimeInformation.RuntimeIdentifier,
alternativeCurrentRuntimeIdentifier,
DependencyContext.RuntimeGraph,
candidateRuntimeIdentifiers,
out mostFitRuntimeIdentifier);
}
#endif
internal static bool TryGetMostFitRuntimeIdentifier(
string currentRuntimeIdentifier,
string alternativeCurrentRuntimeIdentifier,
IReadOnlyList<RuntimeFallbacks> runtimeGraph,
string[] candidateRuntimeIdentifiers,
out string? mostFitRuntimeIdentifier)
{
mostFitRuntimeIdentifier = null;
RuntimeFallbacks[] runtimeFallbacksCandidates;
if (!string.IsNullOrEmpty(currentRuntimeIdentifier))
{
runtimeFallbacksCandidates = [.. runtimeGraph.Where(g => string.Equals(g.Runtime, currentRuntimeIdentifier, StringComparison.OrdinalIgnoreCase))];
}
else
{
runtimeFallbacksCandidates = [];
}
if (runtimeFallbacksCandidates.Length == 0 && !string.IsNullOrEmpty(alternativeCurrentRuntimeIdentifier))
{
runtimeFallbacksCandidates = [.. runtimeGraph.Where(g => string.Equals(g.Runtime, alternativeCurrentRuntimeIdentifier, StringComparison.OrdinalIgnoreCase))];
}
if (runtimeFallbacksCandidates.Length == 0)
{
return false;
}
RuntimeFallbacks runtimeFallbacks = runtimeFallbacksCandidates[0];
List<string?> runtimeFallbacksIncludesRuntime = [runtimeFallbacks.Runtime];
runtimeFallbacksIncludesRuntime.AddRange(runtimeFallbacks.Fallbacks);
var candidateMap = candidateRuntimeIdentifiers
.Distinct(comparer: StringComparer.OrdinalIgnoreCase)
.ToDictionary(x => x, StringComparer.OrdinalIgnoreCase);
foreach (var fallback in runtimeFallbacksIncludesRuntime)
{
if (fallback is not null && candidateMap.TryGetValue(fallback, out string? match))
{
mostFitRuntimeIdentifier = match;
return true;
}
}
return false;
}
private DependencyContext CreateDependencyContext()
{
using (Stream depsFileStream = File.OpenRead(_depsFilePath ?? string.Empty))
using (DependencyContextJsonReader reader = new())
{
return reader.Read(depsFileStream);
}
}
}
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