/// <summary>
/// Build a Kubernetes field selector for <see cref="EventV1.InvolvedObject"/> that targets the specified resource.
/// </summary>
/// <param name="resource">The <see cref="KubeResourceV1"/>.</param>
/// <returns>The field selector.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="resource"/> is <c>null</c>.
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="resource"/> has <c>null</c> <see cref="KubeResourceV1.Metadata"/>.
/// </exception>
static string BuildInvolvedObjectFieldSelector(KubeResourceV1 resource)
{
if (resource == null)
{
throw new ArgumentNullException(nameof(resource));
}
if (resource.Metadata == null)
{
throw new ArgumentException($"{resource.GetType().Name} has null metadata.", nameof(resource));
}
StringBuilder fieldSelector = new StringBuilder()
.AppendFormat("involvedObject.kind={0}", resource.Kind)
.Append(',')
.AppendFormat("involvedObject.apiVersion={0}", resource.ApiVersion)
.Append(',')
.AppendFormat("involvedObject.name={0}", resource.Metadata.Name);
if (!String.IsNullOrWhiteSpace(resource.Metadata.Uid))
{
fieldSelector
.Append(',')
.AppendFormat("involvedObject.uid={0}", resource.Metadata.Uid);
}
if (!String.IsNullOrWhiteSpace(resource.Metadata.Namespace))
{
fieldSelector
.Append(',')
.AppendFormat("involvedObject.namespace={0}", resource.Metadata.Namespace);
}
return(fieldSelector.ToString());
}
/// <summary>
/// Attempt to resolve the related resource for the specified event.
/// </summary>
/// <param name="client">The Kubernetes API client.</param>
/// <param name="eventResource">The <see cref="EventV1"/> to process.</param>
/// <returns>A task representing the asynchronous operation.</returns>
static async Task ResolveRelatedResource(IKubeApiClient client, EventV1 eventResource)
{
if (client == null)
{
throw new ArgumentNullException(nameof(client));
}
if (eventResource == null)
{
throw new ArgumentNullException(nameof(eventResource));
}
KubeResourceV1 involvedResource = await client.Dynamic().Get(eventResource.InvolvedObject);
if (involvedResource != null)
{
Log.Information("\tResolved related {ResourceModelName} resource for event {EventName}.",
involvedResource.GetType().Name,
eventResource.Metadata.Name,
eventResource.Metadata.Namespace
);
}
else
{
Log.Information("\tFailed to resolve related resource for event {EventName}.",
eventResource.Metadata.Name,
eventResource.Metadata.Namespace
);
}
}
void OnResourceDeleted(KubeResourceV1 resource)
{
if (resource == null)
{
throw new ArgumentNullException(nameof(resource));
}
Action <KubeResourceV1> handler;
Type resourceType = resource.GetType();
if (!_deleteHandlers.TryGetValue(resourceType, out handler))
{
Log.LogWarning("No deletion event handler registered for '{ResourceType}' resources.", resourceType.FullName);
return;
}
try
{
handler(resource);
}
catch (Exception handlerError)
{
Log.LogError(handlerError, "Unexpected error encountered by deletion event handler for '{HandlerType}' resource events.", resourceType.FullName);
}
}