public override async Task <NavigationRoute> GetDirectionsAsync(GeoCoordinate currentLocation, GeoCoordinate destination, List <GeoCoordinate> optionalWaypoints = null)
{
string url = ConstructUrl(currentLocation, destination, GoogleDirectionsMode.Walking);
if (_cache.ContainsKey(url))
{
_logger.Trace("Retrieving requested route from cache.");
return(_cache[url]);
}
_logger.Trace("No cached route. Asking Google...");
using (HttpResponseMessage responseMessage = await _httpClient.GetAsync(url))
{
if (!responseMessage.IsSuccessStatusCode)
{
throw new Exception("Error on directions API call");
}
string payload = await responseMessage.Content.ReadAsStringAsync();
GoogleDirectionsResponse directionsResponse = JsonConvert.DeserializeObject <GoogleDirectionsResponse>(payload);
if (directionsResponse.Status != "OK")
{
throw new Exception("Unexpected response from Google# 4193465");
}
if (directionsResponse.Routes.Count != 1 || directionsResponse.Routes[0].Legs.Count != 1)
{
throw new Exception("unexpected response from Google #33593");
}
Leg leg = directionsResponse.Routes[0].Legs[0];
NavigationRoute navigationRoute = new NavigationRoute();
navigationRoute.Distance = leg.distance.Value;
navigationRoute.TravelTime = leg.duration.Value;
List <GeoCoordinate> waypointsList = new List <GeoCoordinate>();
foreach (Step step in leg.Steps)
{
// get waypoints using Polylines within each step
IEnumerable <GeoCoordinate> waypoints = DecodePolyline(step.Polyline.Points);
waypointsList.AddRange(waypoints);
}
// clean up duplicates
navigationRoute.Waypoints = waypointsList.Distinct().ToList();
_cache.Add(url, navigationRoute);
return(navigationRoute);
}
}
public void CheckThatTheGoogleDirectionsRequestReturnsValidResults()
{
var client = Substitute.For <IApiClient>();
var provider = new MappingDataProvider(client);
var request = new GoogleDirectionsRequest
{
Origin = "Bristol",
Destination = "Bath"
};
var response = new GoogleDirectionsResponse();
client.GetAsync(request).Returns(info => response);
var apiResponse = provider.GetAsync(request).Result;
Assert.That(response, Is.SameAs(apiResponse));
}
