69 lines
2.6 KiB
C#
69 lines
2.6 KiB
C#
// <copyright file="Loader.NetFramework.cs" company="OpenTelemetry Authors">
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// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// </copyright>
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#if NETFRAMEWORK
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using System.Reflection;
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namespace OpenTelemetry.AutoInstrumentation.Loader;
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/// <summary>
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/// A class that attempts to load the OpenTelemetry.AutoInstrumentation .NET assembly.
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/// </summary>
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internal partial class Loader
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{
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private static string ResolveManagedProfilerDirectory()
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{
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var tracerHomeDirectory = ReadEnvironmentVariable("OTEL_DOTNET_AUTO_HOME") ?? string.Empty;
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var tracerFrameworkDirectory = "netfx";
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return Path.Combine(tracerHomeDirectory, tracerFrameworkDirectory);
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}
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private static Assembly? AssemblyResolve_ManagedProfilerDependencies(object sender, ResolveEventArgs args)
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{
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var assemblyName = new AssemblyName(args.Name).Name;
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// On .NET Framework, having a non-US locale can cause mscorlib
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// to enter the AssemblyResolve event when searching for resources
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// in its satellite assemblies. Exit early so we don't cause
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// infinite recursion.
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if (string.Equals(assemblyName, "mscorlib.resources", StringComparison.OrdinalIgnoreCase) ||
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string.Equals(assemblyName, "System.Net.Http", StringComparison.OrdinalIgnoreCase))
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{
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return null;
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}
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Logger.Debug("Requester [{0}] requested [{1}]", args?.RequestingAssembly?.FullName ?? "<null>", args?.Name ?? "<null>");
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var path = Path.Combine(ManagedProfilerDirectory, $"{assemblyName}.dll");
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if (File.Exists(path))
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{
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try
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{
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var loadedAssembly = Assembly.LoadFrom(path);
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Logger.Debug<string, bool>("Assembly.LoadFrom(\"{0}\") succeeded={1}", path, loadedAssembly != null);
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return loadedAssembly;
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}
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catch (Exception ex)
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{
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Logger.Debug(ex, "Assembly.LoadFrom(\"{0}\") Exception: {1}", path, ex.Message);
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}
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}
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return null;
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}
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}
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#endif
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