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using Grpc.Core;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Examples
{
class Program
{
/// <summary>
/// Sample client code that makes gRPC calls to the server.
/// </summary>
public class RouteGuideClient
{
readonly RouteGuide.IRouteGuideClient client;
public RouteGuideClient(RouteGuide.IRouteGuideClient client)
{
this.client = client;
}
/// <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 = new Point { Latitude = lat, Longitude = lon };
Feature feature = client.GetFeature(request);
if (feature.Exists())
{
Log("Found feature called \"{0}\" at {1}, {2}",
feature.Name, feature.Location.GetLatitude(), feature.Location.GetLongitude());
}
else
{
Log("Found no feature at {0}, {1}",
feature.Location.GetLatitude(), feature.Location.GetLongitude());
}
}
catch (RpcException e)
{
Log("RPC failed " + e);
throw;
}
}
/// <summary>
/// Server-streaming example. Calls listFeatures with a rectangle of interest. Prints each response feature as it arrives.
/// </summary>
public async Task ListFeatures(int lowLat, int lowLon, int hiLat, int hiLon)
{
try
{
Log("*** ListFeatures: lowLat={0} lowLon={1} hiLat={2} hiLon={3}", lowLat, lowLon, hiLat,
hiLon);
Rectangle request = new Rectangle
{
Lo = new Point { Latitude = lowLat, Longitude = lowLon },
Hi = new Point { Latitude = hiLat, Longitude = hiLon }
};
using (var call = client.ListFeatures(request))
{
var responseStream = call.ResponseStream;
StringBuilder responseLog = new StringBuilder("Result: ");
while (await responseStream.MoveNext())
{
Feature feature = responseStream.Current;
responseLog.Append(feature.ToString());
}
Log(responseLog.ToString());
}
}
catch (RpcException e)
{
Log("RPC failed " + e);
throw;
}
}
/// <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}", point.GetLatitude(), point.GetLongitude());
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.ResponseAsync;
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;
}
}
/// <summary>
/// Bi-directional streaming example. Send some chat messages, and print any
/// chat messages that are sent from the server.
/// </summary>
public async Task RouteChat()
{
try
{
Log("*** RouteChat");
var requests = new List<RouteNote>
{
NewNote("First message", 0, 0),
NewNote("Second message", 0, 1),
NewNote("Third message", 1, 0),
NewNote("Fourth message", 0, 0)
};
using (var call = client.RouteChat())
{
var responseReaderTask = Task.Run(async () =>
{
while (await call.ResponseStream.MoveNext())
{
var note = call.ResponseStream.Current;
Log("Got message \"{0}\" at {1}, {2}", note.Message,
note.Location.Latitude, note.Location.Longitude);
}
});
foreach (RouteNote request in requests)
{
Log("Sending message \"{0}\" at {1}, {2}", request.Message,
request.Location.Latitude, request.Location.Longitude);
await call.RequestStream.WriteAsync(request);
}
await call.RequestStream.CompleteAsync();
await responseReaderTask;
Log("Finished RouteChat");
}
}
catch (RpcException e)
{
Log("RPC failed", e);
throw;
}
}
private void Log(string s, params object[] args)
{
Console.WriteLine(string.Format(s, args));
}
private void Log(string s)
{
Console.WriteLine(s);
}
private RouteNote NewNote(string message, int lat, int lon)
{
return new RouteNote
{
Message = message,
Location = new Point { Latitude = lat, Longitude = lon }
};
}
}
static void Main(string[] args)
{
var channel = new Channel("127.0.0.1:50052", Credentials.Insecure);
var client = new RouteGuideClient(RouteGuide.NewClient(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();
channel.ShutdownAsync().Wait();
Console.WriteLine("Press any key to exit...");
Console.ReadKey();
}
}
}
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