/// <summary>
/// Find the server's associated ServiceMonitor (if it exists).
/// </summary>
/// <returns>
/// The ServiceMonitor, or <c>null</c> if it was not found.
/// </returns>
public async Task <PrometheusServiceMonitorV1> FindServiceMonitor()
{
RequireCurrentState();
List <PrometheusServiceMonitorV1> matchingServices = await KubeClient.PrometheusServiceMonitorsV1().List(
labelSelector: $"cloud.dimensiondata.daas.server-id = {State.Id},cloud.dimensiondata.daas.monitor-type = database-server",
kubeNamespace: KubeOptions.KubeNamespace
);
if (matchingServices.Count == 0)
{
return(null);
}
return(matchingServices[matchingServices.Count - 1]);
}
/// <summary>
/// Ensure that a ServiceMonitor resource does not exist for the specified database server.
/// </summary>
public async Task EnsureServiceMonitorAbsent()
{
RequireCurrentState();
if (State.Kind != DatabaseServerKind.SqlServer)
{
Log.LogInformation("Skipping monitoring configuration for server {ServerId} (not SQL Server).", State.Id);
return;
}
PrometheusServiceMonitorV1 existingServiceMonitor = await FindServiceMonitor();
if (existingServiceMonitor != null)
{
Log.LogInformation("Deleting service monitor {ServiceName} for server {ServerId}...",
existingServiceMonitor.Metadata.Name,
State.Id
);
StatusV1 result = await KubeClient.PrometheusServiceMonitorsV1().Delete(
name: existingServiceMonitor.Metadata.Name,
kubeNamespace: KubeOptions.KubeNamespace
);
if (result.Status != "Success" && result.Reason != "NotFound")
{
Log.LogError("Failed to delete service monitor {ServiceName} for server {ServerId} (Message:{FailureMessage}, Reason:{FailureReason}).",
existingServiceMonitor.Metadata.Name,
State.Id,
result.Message,
result.Reason
);
}
Log.LogInformation("Deleted service monitor {ServiceName} for server {ServerId}.",
existingServiceMonitor.Metadata.Name,
State.Id
);
}
}
/// <summary>
/// Ensure that a ServiceMonitor resource exists for the specified database server.
/// </summary>
/// <returns>
/// The Service resource, as a <see cref="ServiceV1"/>.
/// </returns>
public async Task EnsureServiceMonitorPresent()
{
RequireCurrentState();
if (State.Kind != DatabaseServerKind.SqlServer)
{
Log.LogInformation("Skipping monitoring configuration for server {ServerId} (not SQL Server).", State.Id);
return;
}
PrometheusServiceMonitorV1 existingServiceMonitor = await FindServiceMonitor();
if (existingServiceMonitor == null)
{
Log.LogInformation("Creating service monitor for server {ServerId}...",
State.Id
);
PrometheusServiceMonitorV1 createdService = await KubeClient.PrometheusServiceMonitorsV1().Create(
KubeResources.ServiceMonitor(State,
kubeNamespace: KubeOptions.KubeNamespace
)
);
Log.LogInformation("Successfully created service monitor {ServiceName} for server {ServerId}.",
createdService.Metadata.Name,
State.Id
);
}
else
{
Log.LogInformation("Found existing service monitor {ServiceName} for server {ServerId}.",
existingServiceMonitor.Metadata.Name,
State.Id
);
}
}