public async Task <PingDataPoint> PingServerAsync(PingSetting setting)
{
using (var httpClient = _factory.BuildClient())
{
TimeSpan responseTime;
HttpStatusCode statusCode = HttpStatusCode.ServiceUnavailable;
// Generate a request
var httpContent = new HttpRequestMessage(
setting.GetMethodRequired ? HttpMethod.Get : HttpMethod.Head,
setting.ServerUrl
);
var timer = new Stopwatch();
timer.Start();
var task = httpClient.SendAsync(httpContent);
// Make sure task finishes in TotalMilliseconds milliseconds
if (
await Task.WhenAny(
task,
Task.Delay(Convert.ToInt32(setting.MaxResponseTime.TotalMilliseconds))
) == task
)
{
var response = await task;
timer.Stop();
// Record time and code
responseTime = timer.Elapsed;
statusCode = response.StatusCode;
}
if (
statusCode == HttpStatusCode.ServiceUnavailable ||
responseTime > setting.MaxResponseTime
)
{
// Timeout/cancellation logic
// If problem occurred then set service unavailable.
responseTime = new TimeSpan(0);
statusCode = HttpStatusCode.ServiceUnavailable;
// _logger.LogWarning(LoggingEvents.Ping.AsInt(), $"Resource {setting.ServerUrl} is unavailable. See stack trace.");
}
_logger.LogDebug(LoggingEvents.Ping.AsInt(), $"Ping completed for {setting.ServerUrl}");
var metric = await _metrics.GetOrCreateMetricAsync(Metrics.Ping, new Uri(setting.ServerUrl).Host);
return(new PingDataPoint
{
Metric = metric,
ResponseTime = responseTime,
Success = statusCode.AsInt() / 100 == 2, // 2xx
Message = statusCode.AsInt() / 100 == 2 ? "OK" : "Failure"
});
}
}
