/// <summary>
/// Realizes a desired state by creating, updating and deleting resources as required.
/// </summary>
/// <param name="client">The client used to perform operations.</param>
/// <param name="desired">The desired state to achieve.</param>
/// <param name="labelSelector">A label selector to restrict the modifications to.</param>
/// <param name="namespace">A namespace to restrict the modifications to.</param>
/// <param name="cancellationToken">The cancellation token.</param>
public static async Task RealizeStateAsync <TResource>(this ICustomResourceClient <TResource> client,
IReadOnlyCollection <TResource> desired,
string labelSelector = null,
string @namespace = null,
CancellationToken cancellationToken = default)
where TResource : CustomResource, IPayloadPatchable <TResource>
{
var existing = await client.ListAsync(labelSelector, @namespace, cancellationToken);
foreach (var resource in desired)
{
var existingResource = existing.FirstOrDefault(resource.NameEquals);
if (existingResource == null)
{
await client.CreateAsync(resource, cancellationToken);
}
else if (!existingResource.Equals(resource))
{
await client.UpdateAsync(resource, cancellationToken);
}
}
foreach (var resource in existing.Where(desired.DoesNotContain))
{
await client.DeleteAsync(resource.Metadata.Name, resource.Metadata.Namespace, cancellationToken);
}
}
private async Task SubscribeAsync()
{
var list = await _client.ListAsync(@namespace : _namespace);
OnList(list);
lock (_subscriptionLock)
{
_subscription?.Dispose();
_subscription = _client.Watch(_namespace, list.Metadata.ResourceVersion)
.Subscribe(OnNext, OnError, OnCompleted);
}
_logger.LogDebug("Subscribed to {0}.", _crd);
}
