/// <summary>
/// Gets a stream of points, and responds with statistics about the "trip": number of points,
/// number of known features visited, total distance traveled, and total time spent.
/// </summary>
public async Task <RouteSummary> RecordRoute(Grpc.Core.ServerCallContext context, Grpc.Core.IAsyncStreamReader <Point> requestStream)
{
int pointCount = 0;
int featureCount = 0;
int distance = 0;
Point previous = null;
var stopwatch = new Stopwatch();
stopwatch.Start();
while (await requestStream.MoveNext())
{
var point = requestStream.Current;
pointCount++;
if (RouteGuideUtil.Exists(CheckFeature(point)))
{
featureCount++;
}
if (previous != null)
{
distance += (int)CalcDistance(previous, point);
}
previous = point;
}
stopwatch.Stop();
return(RouteSummary.CreateBuilder().SetPointCount(pointCount)
.SetFeatureCount(featureCount).SetDistance(distance)
.SetElapsedTime((int)(stopwatch.ElapsedMilliseconds / 1000)).Build());
}
/// <summary>
/// Blocking unary call example. Calls GetFeature and prints the response.
/// </summary>
public void GetFeature(int lat, int lon)
{
try
{
Log("*** GetFeature: lat={0} lon={1}", lat, lon);
Point request = Point.CreateBuilder().SetLatitude(lat).SetLongitude(lon).Build();
Feature feature = client.GetFeature(request);
if (RouteGuideUtil.Exists(feature))
{
Log("Found feature called \"{0}\" at {1}, {2}",
feature.Name,
RouteGuideUtil.GetLatitude(feature.Location),
RouteGuideUtil.GetLongitude(feature.Location));
}
else
{
Log("Found no feature at {0}, {1}",
RouteGuideUtil.GetLatitude(feature.Location),
RouteGuideUtil.GetLongitude(feature.Location));
}
}
catch (RpcException e)
{
Log("RPC failed " + e);
throw e;
}
}
static void Main(string[] args)
{
GrpcEnvironment.Initialize();
using (Channel channel = new Channel("127.0.0.1:50052"))
{
var client = new RouteGuideClient(RouteGuide.NewStub(channel));
// Looking for a valid feature
client.GetFeature(409146138, -746188906);
// Feature missing.
client.GetFeature(0, 0);
// Looking for features between 40, -75 and 42, -73.
client.ListFeatures(400000000, -750000000, 420000000, -730000000).Wait();
// Record a few randomly selected points from the features file.
client.RecordRoute(RouteGuideUtil.ParseFeatures(RouteGuideUtil.DefaultFeaturesFile), 10).Wait();
// Send and receive some notes.
client.RouteChat().Wait();
}
GrpcEnvironment.Shutdown();
}
/// <summary>
/// Calculate the distance between two points using the "haversine" formula.
/// This code was taken from http://www.movable-type.co.uk/scripts/latlong.html.
/// </summary>
/// <param name="start">the starting point</param>
/// <param name="end">the end point</param>
/// <returns>the distance between the points in meters</returns>
private static double CalcDistance(Point start, Point end)
{
double lat1 = RouteGuideUtil.GetLatitude(start);
double lat2 = RouteGuideUtil.GetLatitude(end);
double lon1 = RouteGuideUtil.GetLongitude(start);
double lon2 = RouteGuideUtil.GetLongitude(end);
int r = 6371000; // metres
double φ1 = ToRadians(lat1);
double φ2 = ToRadians(lat2);
double Δφ = ToRadians(lat2 - lat1);
double Δλ = ToRadians(lon2 - lon1);
double a = Math.Sin(Δφ / 2) * Math.Sin(Δφ / 2) + Math.Cos(φ1) * Math.Cos(φ2) * Math.Sin(Δλ / 2) * Math.Sin(Δλ / 2);
double c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
return(r * c);
}
static void Main(string[] args)
{
var features = RouteGuideUtil.ParseFeatures(RouteGuideUtil.DefaultFeaturesFile);
GrpcEnvironment.Initialize();
Server server = new Server();
server.AddServiceDefinition(RouteGuide.BindService(new RouteGuideImpl(features)));
int port = server.AddListeningPort("localhost", 50052);
server.Start();
Console.WriteLine("RouteGuide server listening on port " + port);
Console.WriteLine("Press any key to stop the server...");
Console.ReadKey();
server.ShutdownAsync().Wait();
GrpcEnvironment.Shutdown();
}
/// <summary>
/// Gets all features contained within the given bounding rectangle.
/// </summary>
public async Task ListFeatures(Grpc.Core.ServerCallContext context, Rectangle request, Grpc.Core.IServerStreamWriter <Feature> responseStream)
{
int left = Math.Min(request.Lo.Longitude, request.Hi.Longitude);
int right = Math.Max(request.Lo.Longitude, request.Hi.Longitude);
int top = Math.Max(request.Lo.Latitude, request.Hi.Latitude);
int bottom = Math.Min(request.Lo.Latitude, request.Hi.Latitude);
foreach (var feature in features)
{
if (!RouteGuideUtil.Exists(feature))
{
continue;
}
int lat = feature.Location.Latitude;
int lon = feature.Location.Longitude;
if (lon >= left && lon <= right && lat >= bottom && lat <= top)
{
await responseStream.WriteAsync(feature);
}
}
}
/// <summary>
/// Client-streaming example. Sends numPoints randomly chosen points from features
/// with a variable delay in between. Prints the statistics when they are sent from the server.
/// </summary>
public async Task RecordRoute(List <Feature> features, int numPoints)
{
try
{
Log("*** RecordRoute");
using (var call = client.RecordRoute())
{
// Send numPoints points randomly selected from the features list.
StringBuilder numMsg = new StringBuilder();
Random rand = new Random();
for (int i = 0; i < numPoints; ++i)
{
int index = rand.Next(features.Count);
Point point = features[index].Location;
Log("Visiting point {0}, {1}", RouteGuideUtil.GetLatitude(point),
RouteGuideUtil.GetLongitude(point));
await call.RequestStream.WriteAsync(point);
// A bit of delay before sending the next one.
await Task.Delay(rand.Next(1000) + 500);
}
await call.RequestStream.CompleteAsync();
RouteSummary summary = await call.Result;
Log("Finished trip with {0} points. Passed {1} features. "
+ "Travelled {2} meters. It took {3} seconds.", summary.PointCount,
summary.FeatureCount, summary.Distance, summary.ElapsedTime);
Log("Finished RecordRoute");
}
}
catch (RpcException e)
{
Log("RPC failed", e);
throw e;
}
}
