private async Task PredictDelays(DepartureQuery query, ForecastResult forecast)
{
if (string.IsNullOrEmpty(mlUrl))
{
return;
}
var departureDate = DateTime.Parse(txtDepartureDate.Text);
prediction = new DelayPrediction();
try
{
using (var client = new HttpClient())
{
var predictionRequest = new PredictionRequest
{
OriginAirportCode = query.OriginAirportCode,
Month = query.DepartureDate.Month,
DayofMonth = query.DepartureDate.Day,
CRSDepHour = query.DepartureDate.Hour,
DayOfWeek = query.DepartureDayOfWeek,
Carrier = query.Carrier,
DestAirportCode = query.DestAirportCode,
WindSpeed = forecast.WindSpeed,
SeaLevelPressure = forecast.Pressure,
HourlyPrecip = forecast.Precipitation
};
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", mlApiKey);
client.BaseAddress = new Uri(mlUrl);
var response = await client.PostAsJsonAsync("", predictionRequest).ConfigureAwait(false);
if (response.IsSuccessStatusCode)
{
var result = await response.Content.ReadAsStringAsync();
var token = JToken.Parse(result);
var parsedResult = JsonConvert.DeserializeObject <PredictionResult>((string)token);
if (parsedResult.prediction == 1)
{
this.prediction.ExpectDelays = true;
this.prediction.Confidence = parsedResult.probability;
}
else if (parsedResult.prediction == 0)
{
this.prediction.ExpectDelays = false;
this.prediction.Confidence = parsedResult.probability;
}
else
{
this.prediction = null;
}
}
else
{
prediction = null;
Trace.Write($"The request failed with status code: {response.StatusCode}");
// Print the headers - they include the request ID and the timestamp, which are useful for debugging the failure
Trace.Write(response.Headers.ToString());
var responseContent = await response.Content.ReadAsStringAsync();
Trace.Write(responseContent);
}
}
}
catch (Exception ex)
{
prediction = null;
System.Diagnostics.Trace.TraceError("Failed retrieving delay prediction: " + ex.ToString());
throw;
}
}