static async Task Run(
HttpHealthCheck healthCheck,
TimeSpan interval,
HealthCheckReporter reporter,
ILogger diagnosticLog,
CancellationToken cancel)
{
try
{
while (!cancel.IsCancellationRequested)
{
var result = await healthCheck.CheckNow(cancel);
reporter.Report(result);
if (result.Elapsed < interval.TotalMilliseconds)
{
var delay = (int)(interval.TotalMilliseconds - result.Elapsed);
await Task.Delay(delay, cancel);
}
}
}
catch (OperationCanceledException)
{
// Unloading
}
catch (Exception ex)
{
diagnosticLog.Fatal(ex, "The health check task threw an unhandled exception");
}
}
public void Start(TextWriter inputWriter)
{
_httpClient = HttpHealthCheckClient.Create();
var reporter = new HealthCheckReporter(inputWriter);
JsonDataExtractor extractor = null;
if (!string.IsNullOrWhiteSpace(DataExtractionExpression))
{
extractor = new JsonDataExtractor(DataExtractionExpression);
}
var targetUrls = TargetUrl.Split(new[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries);
foreach (var targetUrl in targetUrls)
{
var healthCheck = new HttpHealthCheck(
_httpClient,
App.Title,
targetUrl,
extractor,
BypassHttpCaching);
_healthCheckTasks.Add(new HealthCheckTask(
healthCheck,
TimeSpan.FromSeconds(IntervalSeconds),
reporter,
Log));
}
}
public HealthCheckTask(HttpHealthCheck healthCheck, TimeSpan interval, HealthCheckReporter reporter, ILogger diagnosticLog)
{
if (healthCheck == null)
{
throw new ArgumentNullException(nameof(healthCheck));
}
if (reporter == null)
{
throw new ArgumentNullException(nameof(reporter));
}
_healthCheckTask = Task.Run(() => Run(healthCheck, interval, reporter, diagnosticLog, _cancel.Token), _cancel.Token);
}
