protected string SerializeTelemetry(TelemetryData data)
{
return(JsonConvert.SerializeObject(data, Formatting.None, SerializerSettings));
}
public override async Task <TelemetryPushResult> PushTelemetry(TelemetryData data)
{
try
{
// have to buffer in memory so we know the content length
var serializedData = SerializeTelemetry(data);
var bytes = Encoding.UTF8.GetBytes(serializedData);
var request = WebRequest.CreateHttp(_endpoint);
request.Method = "POST";
request.ContentType = "application/json";
request.ContentLength = bytes.Length;
foreach (var defaultHeader in TelemetryHttpHeaderNames.DefaultHeaders)
{
request.Headers.Add(defaultHeader.Key, defaultHeader.Value);
}
if (!string.IsNullOrEmpty(_apiKey))
{
request.Headers.Add(TelemetryConstants.ApiKeyHeader, _apiKey);
}
request.Headers.Add(TelemetryConstants.ApiVersionHeader, data.ApiVersion);
request.Headers.Add(TelemetryConstants.RequestTypeHeader, data.RequestType);
using (var requestStream = await request.GetRequestStreamAsync().ConfigureAwait(false))
{
await requestStream.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
}
using (var response = (HttpWebResponse)await request.GetResponseAsync().ConfigureAwait(false))
{
var statusCode = (int)response.StatusCode;
if (statusCode >= 200 && statusCode < 300)
{
Log.Debug("Telemetry sent successfully");
return(TelemetryPushResult.Success);
}
else if (statusCode == 404)
{
Log.Debug("Error sending telemetry: 404. Disabling further telemetry, as endpoint not found", response.StatusCode);
return(TelemetryPushResult.FatalError);
}
else
{
Log.Debug("Error sending telemetry {StatusCode}", response.StatusCode);
return(TelemetryPushResult.TransientFailure);
}
}
}
catch (Exception ex) when(IsFatalException(ex))
{
Log.Warning(ex, "Error sending telemetry data, unable to communicate with endpoint");
return(TelemetryPushResult.FatalError);
}
catch (Exception ex)
{
Log.Warning(ex, "Error sending telemetry data");
return(TelemetryPushResult.TransientFailure);
}
}
public abstract Task <TelemetryPushResult> PushTelemetry(TelemetryData data);
