protected override async Task WorkLoopIteration()
{
++_dbgIterationsCount;
var waitingLogSeverity = LogLevel.Trace;
WaitInfoS waitInfo;
HttpRequestMessage httpRequest = null;
HttpResponseMessage httpResponse = null;
string httpResponseBody = null;
try
{
httpRequest = BuildHttpRequest(_eTag);
(httpResponse, httpResponseBody) = await FetchConfigHttpResponseAsync(httpRequest);
ConfigDelta configDelta;
(configDelta, waitInfo) = ProcessHttpResponse(httpResponse, httpResponseBody);
if (configDelta != null)
{
UpdateConfigStore(configDelta);
_eTag = httpResponse.Headers.ETag;
}
}
catch (OperationCanceledException)
{
throw;
}
catch (Exception ex)
{
var severity = LogLevel.Error;
waitInfo = new WaitInfoS(WaitTimeIfAnyError, "Default wait time is used because exception was thrown"
+ " while fetching configuration from APM Server and parsing it.");
if (ex is FailedToFetchConfigException fEx)
{
severity = fEx.Severity;
fEx.WaitInfo?.Let(it => { waitInfo = it; });
}
if (severity == LogLevel.Error)
{
waitingLogSeverity = LogLevel.Information;
}
_logger.IfLevel(severity)
?.LogException(ex, "Exception was thrown while fetching configuration from APM Server and parsing it."
+ " ETag: `{ETag}'. URL: `{Url}'. Apm Server base URL: `{ApmServerUrl}'. WaitInterval: {WaitInterval}."
+ " dbgIterationsCount: {dbgIterationsCount}."
+ Environment.NewLine + "+-> Request:{HttpRequest}"
+ Environment.NewLine + "+-> Response:{HttpResponse}"
+ Environment.NewLine + "+-> Response body [length: {HttpResponseBodyLength}]:{HttpResponseBody}"
, _eTag.AsNullableToString(), _getConfigAbsoluteUrl, HttpClientInstance.BaseAddress, waitInfo.Interval.ToHms(),
_dbgIterationsCount
, httpRequest == null ? " N/A" : Environment.NewLine + TextUtils.Indent(httpRequest.ToString())
, httpResponse == null ? " N/A" : Environment.NewLine + TextUtils.Indent(httpResponse.ToString())
, httpResponseBody == null ? "N/A" : httpResponseBody.Length.ToString()
, httpResponseBody == null ? " N/A" : Environment.NewLine + TextUtils.Indent(httpResponseBody));
}
finally
{
httpRequest?.Dispose();
httpResponse?.Dispose();
}
_logger.IfLevel(waitingLogSeverity)
?.Log("Waiting {WaitInterval}... {WaitReason}. dbgIterationsCount: {dbgIterationsCount}."
, waitInfo.Interval.ToHms(), waitInfo.Reason, _dbgIterationsCount);
await _agentTimer.Delay(_agentTimer.Now + waitInfo.Interval, CtsInstance.Token);
}