// RecordRoute records a route composited of a sequence of points.
//
// It 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.
func (s *routeGuideServer) RecordRoute(stream pb.RouteGuide_RecordRouteServer) error {
var pointCount, featureCount, distance int32
var lastPoint *pb.Point
startTime := time.Now()
for {
point, err := stream.Recv()
if err == io.EOF {
endTime := time.Now()
return stream.SendAndClose(&pb.RouteSummary{
PointCount: pointCount,
FeatureCount: featureCount,
Distance: distance,
ElapsedTime: int32(endTime.Sub(startTime).Seconds()),
})
}
if err != nil {
return err
}
pointCount++
for _, feature := range s.savedFeatures {
if proto.Equal(feature.Location, point) {
featureCount++
}
}
if lastPoint != nil {
distance += calcDistance(lastPoint, point)
}
lastPoint = point
}
}
// GetFeature returns the feature at the given point.
func (s *routeGuideServer) GetFeature(ctx context.Context, point *pb.Point) (*pb.Feature, error) {
for _, feature := range s.savedFeatures {
if proto.Equal(feature.Location, point) {
return feature, nil
}
}
// No feature was found, return an unnamed feature
return &pb.Feature{"", point}, nil
}
// DoEmptyUnaryCall performs a unary RPC with empty request and response messages.
func DoEmptyUnaryCall(tc testpb.TestServiceClient) {
reply, err := tc.EmptyCall(context.Background(), &testpb.Empty{})
if err != nil {
grpclog.Fatal("/TestService/EmptyCall RPC failed: ", err)
}
if !proto.Equal(&testpb.Empty{}, reply) {
grpclog.Fatalf("/TestService/EmptyCall receives %v, want %v", reply, testpb.Empty{})
}
grpclog.Println("EmptyUnaryCall done")
}