private static async Task <HealthCheckResult> ExecutePingCheckAsync(string host, TimeSpan timeout, bool degradedOnError)
{
try
{
var ping = new Ping();
var result = await ping.SendPingAsync(host, (int)timeout.TotalMilliseconds).ConfigureAwait(false);
return(result.Status == IPStatus.Success
? HealthCheckResult.Healthy($"OK. {host}")
: HealthCheckResultOnError($"FAILED. {host} ping result was {result.Status}", degradedOnError));
}
catch (Exception ex)
{
return(degradedOnError
? HealthCheckResult.Degraded(ex)
: HealthCheckResult.Unhealthy(ex));
}
}
private static Func <ValueTask <HealthCheckResult> > CheckMessageCount(string name, CloudStorageAccount storageAccount, string queueName, long degradedThreshold, long?unhealthyThreshold)
{
var queue = storageAccount
.CreateCloudQueueClient()
.GetQueueReference(queueName);
return(async() =>
{
int?result = null;
try
{
await queue.FetchAttributesAsync().ConfigureAwait(false);
result = queue.ApproximateMessageCount;
}
catch (Exception ex)
{
Logger.ErrorException($"{name} failed.", ex);
return HealthCheckResult.Unhealthy($"Failed. Unable to check queue '{queueName}'.");
}
if (result > 0 && result >= unhealthyThreshold)
{
return HealthCheckResult.Unhealthy($"Unhealthy. '{queueName}' has {result.Value} messages.");
}
if (result > 0 && result >= degradedThreshold)
{
return HealthCheckResult.Degraded($"Degraded. '{queueName}' has {result.Value} messages.");
}
return HealthCheckResult.Healthy($"OK. '{queueName}' has {result} messages.");
});
}
/// <summary>
/// Create a failure (degraded or unhealthy) status response.
/// </summary>
/// <param name="message">Status message.</param>
/// <param name="degradedOnError">
/// If true, create a degraded status response.
/// Otherwise create an unhealthy status response. (default: false)
/// </param>
/// <returns>Failure status response.</returns>
private static HealthCheckResult HealthCheckResultOnError(string message, bool degradedOnError)
{
return(degradedOnError
? HealthCheckResult.Degraded(message)
: HealthCheckResult.Unhealthy(message));
}