private static void TryLoadManagedAssembly()
{
StartupLogger.Log("Managed Loader TryLoadManagedAssembly()");
try
{
var assembly = Assembly.Load("OpenTelemetry.AutoInstrumentation");
if (assembly == null)
{
throw new FileNotFoundException("The assembly OpenTelemetry.AutoInstrumentation could not be loaded");
}
var type = assembly.GetType("OpenTelemetry.AutoInstrumentation.Instrumentation", throwOnError: false);
if (type == null)
{
throw new TypeLoadException("The type OpenTelemetry.AutoInstrumentation.Instrumentation could not be loaded");
}
var method = type.GetRuntimeMethod("Initialize", new Type[0]);
if (method == null)
{
throw new MissingMethodException("The method OpenTelemetry.AutoInstrumentation.Instrumentation.Initialize could not be loaded");
}
method.Invoke(obj: null, parameters: null);
}
catch (Exception ex)
{
StartupLogger.Log(ex, $"Error when loading managed assemblies. {ex.Message}");
throw;
}
}
private static string ReadEnvironmentVariable(string key)
{
try
{
return(Environment.GetEnvironmentVariable(key));
}
catch (Exception ex)
{
StartupLogger.Log(ex, "Error while loading environment variable " + key);
}
return(null);
}
/// <summary>
/// Initializes static members of the <see cref="Startup"/> class.
/// This method also attempts to load the OpenTelemetry.AutoInstrumentation .NET assembly.
/// </summary>
static Startup()
{
ManagedProfilerDirectory = ResolveManagedProfilerDirectory();
try
{
AppDomain.CurrentDomain.AssemblyResolve += AssemblyResolve_ManagedProfilerDependencies;
}
catch (Exception ex)
{
StartupLogger.Log(ex, "Unable to register a callback to the CurrentDomain.AssemblyResolve event.");
}
TryLoadManagedAssembly();
}