public async Task <IApiStatusObject> GetStatusAsync(string url, CancellationToken cancellationToken)
{
var response = await _httpClient.GetAsync(url, cancellationToken);
string content = await response.Content.ReadAsStringAsync();
if (!response.IsSuccessStatusCode)
{
if (content.Length > _maxContentLength)
{
content = content.Substring(0, _maxContentLength);
}
throw new SimpleHttpResponseException(response.StatusCode, content);
}
IApiStatusObject statusObject = null;
try
{
statusObject = JsonConvert.DeserializeObject <ApiStatusObject>(content);
}
catch (Exception)
{
// hiding such exception, cause we can get response from our web-sites with a page content here.
}
return(statusObject ?? new ApiStatusObject()
{
Version = "undefined"
});
}
public async Task CheckAPIs()
{
List <IMonitoringObject> apisMonitoring = await GetMonitoringObjectsForProcessing(x => !string.IsNullOrEmpty(x.Url));
DateTime now = DateTime.UtcNow;
List <Task> recipientChecks = new List <Task>(apisMonitoring.Count);
var issues = new ConcurrentBag <ApiHealthCheckError>();
foreach (var monitoringItem in apisMonitoring)
{
var task = Task.Run(async() =>
{
try
{
CancellationTokenSource cts = new CancellationTokenSource(TimeSpan.FromSeconds(_settings.PingTimeoutInSeconds));
IApiStatusObject statusObject = await _isAliveService.GetStatusAsync(monitoringItem.Url, cts.Token);
monitoringItem.Version = statusObject.Version;
monitoringItem.LastTime = now;
monitoringItem.EnvInfo = statusObject.Env;
HandleResilience(issues, statusObject.IssueIndicators, monitoringItem);
}
catch (OperationCanceledException)
{
GenerateError(issues, now, "Timeout", monitoringItem);
}
catch (SimpleHttpResponseException e)
{
GenerateError(issues, now, e.StatusCode.ToString(), monitoringItem);
}
catch (Exception e)
{
GenerateError(issues, now, $"Unexpected exception: {e.GetBaseException().Message}", monitoringItem);
}
});
recipientChecks.Add(task);
}
await Task.WhenAll(recipientChecks);
foreach (var issue in issues)
{
await _apiHealthCheckErrorRepository.InsertAsync(issue);
}
foreach (var api in apisMonitoring)
{
await _monitoringService.PingAsync(api);
}
}
