/// <summary>
/// Called once at startup by the hosting infrastructure. This function must remain running
/// for the entire lifetime of an application.
/// </summary>
/// <param name="cancellationToken">Indicates when the web application is shutting down.</param>
/// <returns>The Task representing the async function results.</returns>
public override async Task RunAsync(CancellationToken cancellationToken)
{
// First wait for all informers to fully List resources before processing begins.
foreach (var registration in _registrations)
{
await registration.ReadyAsync(cancellationToken).ConfigureAwait(false);
}
// At this point we know that all of the Ingress and Endpoint caches are at least in sync
// with cluster's state as of the start of this controller.
// Now begin one loop to process work until an application shudown is requested.
while (!cancellationToken.IsCancellationRequested)
{
// Dequeue the next item to process
var(item, shutdown) = await _queue.GetAsync(cancellationToken).ConfigureAwait(false);
if (shutdown)
{
return;
}
try
{
// Fetch the currently known information about this Ingress
if (_cache.TryGetReconcileData(item.NamespacedName, out var data))
{
#pragma warning disable CA1303 // Do not pass literals as localized parameters
Logger.LogInformation("Processing {IngressNamespace} {IngressName}", item.NamespacedName.Namespace, item.NamespacedName.Name);
#pragma warning restore CA1303 // Do not pass literals as localized parameters
// Pass the information to the reconciler to process and dispatch
await _reconciler.ProcessAsync(item.DispatchTarget, item.NamespacedName, data, cancellationToken).ConfigureAwait(false);
}
// Tell the queue to forget any exponential backoff details like attempt count
_queue.Forget(item);
}
#pragma warning disable CA1031 // Do not catch general exception types
catch
#pragma warning restore CA1031 // Do not catch general exception types
{
#pragma warning disable CA1303 // Do not pass literals as localized parameters
Logger.LogInformation("Rescheduling {IngressNamespace} {IngressName}", item.NamespacedName.Namespace, item.NamespacedName.Name);
#pragma warning restore CA1303 // Do not pass literals as localized parameters
// Any failure to process this item results in being re-queued after
// a per-item exponential backoff delay combined with
// and an overall retry rate of 10 per second
_queue.AddRateLimited(item);
}
finally
{
// calling Done after GetAsync informs the queue
// that the item is no longer being actively processed
_queue.Done(item);
}
}
}
/// <inheritdoc/> public virtual void Forget(TItem item) => _base.Forget(item);