/// <summary>
/// Intercept an asynchronous operation that returns a Task.
/// </summary>
private static async Task InterceptAsync(Task task, IInvocation invocation, AuditInterceptEvent intEvent, AuditScope scope)
{
try
{
await task.ConfigureAwait(false);
}
catch
{
EndAsyncAuditInterceptEvent(task, invocation, intEvent, scope, null);
throw;
}
EndAsyncAuditInterceptEvent(task, invocation, intEvent, scope, "Void");
}
/// <summary>
/// Creates the audit intercept event. Returns NULL if the event should be bypassed
/// </summary>
private AuditInterceptEvent CreateAuditInterceptEvent(IInvocation invocation)
{
var method = invocation.MethodInvocationTarget;
if (method == null)
{
// operation is not implemented
return(null);
}
bool ignore = method.GetCustomAttributes(typeof(AuditIgnoreAttribute), true).FirstOrDefault() != null;
if (ignore)
{
// operation is explicitly ignored
return(null);
}
bool isProp = method.IsSpecialName && (method.Name.StartsWith("get_") || method.Name.StartsWith("set_"));
if (isProp && Settings.IgnoreProperties)
{
// operation is a property getter/setter and should be ignored
return(null);
}
bool isEvent = method.IsSpecialName && (method.Name.StartsWith("add_") || method.Name.StartsWith("remove_"));
if (isEvent && Settings.IgnoreEvents)
{
// operation is an event attach/detach and should be ignored
return(null);
}
if (Settings.MethodFilter != null)
{
if (!Settings.MethodFilter.Invoke(method))
{
// operation was filtered out
return(null);
}
}
var intEvent = new AuditInterceptEvent()
{
ClassName = invocation.TargetType.Name,
InstanceQualifiedName = invocation.TargetType.AssemblyQualifiedName,
MethodName = method.Name,
MethodSignature = method.ToString(),
PropertyName = isProp ? method.Name.Substring(method.Name.IndexOf('_') + 1) : null,
EventName = isEvent ? method.Name.Substring(method.Name.IndexOf('_') + 1) : null,
Arguments = GetInputParams(invocation)
};
return(intEvent);
}
/// <summary>
/// Ends the event successfully.
/// </summary>
/// <param name="invocation">The invocation.</param>
/// <param name="intEvent">The int event.</param>
/// <param name="returnValue">The return value.</param>
private static void SuccessAuditInterceptEvent(IInvocation invocation, AuditInterceptEvent intEvent, object returnValue)
{
var method = invocation.MethodInvocationTarget;
intEvent.Success = true;
if (IncludeReturnValue(method))
{
intEvent.Result = new AuditInterceptArgument(method.ReturnType, returnValue);
}
// update the output param values
if (intEvent.Arguments != null)
{
var methodParams = method.GetParameters();
for (int i = 0; i < intEvent.Arguments.Count; i++)
{
var arg = intEvent.Arguments[i];
if (methodParams[arg.Index.Value].ParameterType.IsByRef)
{
arg.OutputValue = invocation.Arguments[arg.Index.Value];
}
}
}
}
/// <summary>
/// Ends the event for asynchronous interceptions.
/// </summary>
private static void EndAsyncAuditInterceptEvent(Task task, IInvocation invocation, AuditInterceptEvent intEvent, AuditScope scope, object result)
{
intEvent.AsyncStatus = task.Status.ToString();
if (task.Status == TaskStatus.Faulted)
{
intEvent.Exception = task.Exception?.GetExceptionInfo();
}
else if (task.Status == TaskStatus.RanToCompletion)
{
SuccessAuditInterceptEvent(invocation, intEvent, result);
}
scope.Save();
}
/// <summary>
/// Intercept an asynchronous operation that returns a Task Of[T].
/// </summary>
private static async Task <T> InterceptAsync <T>(Task <T> task, IInvocation invocation, AuditInterceptEvent intEvent, AuditScope scope)
{
T result;
try
{
result = await task.ConfigureAwait(false);
}
catch
{
EndAsyncAuditInterceptEvent(task, invocation, intEvent, scope, null);
throw;
}
EndAsyncAuditInterceptEvent(task, invocation, intEvent, scope, result);
return(result);
}
