public override HealthCheck Check()
{
var enabledProviders = _providerFactory.GetAvailableProviders();
var backOffProviders = enabledProviders.Join(_providerStatusService.GetBlockedProviders(),
i => i.Definition.Id,
s => s.ProviderId,
(i, s) => new { Provider = i, Status = s })
.Where(p => p.Status.InitialFailure.HasValue &&
p.Status.InitialFailure.Value.After(
DateTime.UtcNow.AddHours(-6)))
.ToList();
if (backOffProviders.Empty())
{
return(new HealthCheck(GetType()));
}
if (backOffProviders.Count == enabledProviders.Count)
{
return(new HealthCheck(GetType(),
HealthCheckResult.Error,
_localizationService.GetLocalizedString("ApplicationStatusCheckAllClientMessage"),
"#applications-are-unavailable-due-to-failures"));
}
return(new HealthCheck(GetType(),
HealthCheckResult.Warning,
string.Format(_localizationService.GetLocalizedString("ApplicationStatusCheckSingleClientMessage"),
string.Join(", ", backOffProviders.Select(v => v.Provider.Definition.Name))),
"#applications-are-unavailable-due-to-failures"));
}
private IEnumerable <IApplication> FilterBlockedApplications(IEnumerable <IApplication> applications)
{
var blockedApplications = _applicationStatusService.GetBlockedProviders().ToDictionary(v => v.ProviderId, v => v);
foreach (var application in applications)
{
ApplicationStatus blockedApplicationStatus;
if (blockedApplications.TryGetValue(application.Definition.Id, out blockedApplicationStatus))
{
_logger.Debug("Temporarily ignoring application {0} till {1} due to recent failures.", application.Definition.Name, blockedApplicationStatus.DisabledTill.Value.ToLocalTime());
continue;
}
yield return(application);
}
}