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vendor/google.golang.org/grpc/examples/route_guide/server/server.go

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+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+// Package main implements a simple gRPC server that demonstrates how to use gRPC-Go libraries
+// to perform unary, client streaming, server streaming and full duplex RPCs.
+//
+// It implements the route guide service whose definition can be found in proto/route_guide.proto.
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"math"
+	"net"
+	"time"
+
+	"golang.org/x/net/context"
+	"google.golang.org/grpc"
+
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/grpclog"
+
+	"github.com/golang/protobuf/proto"
+
+	pb "google.golang.org/grpc/examples/route_guide/routeguide"
+)
+
+var (
+	tls        = flag.Bool("tls", false, "Connection uses TLS if true, else plain TCP")
+	certFile   = flag.String("cert_file", "testdata/server1.pem", "The TLS cert file")
+	keyFile    = flag.String("key_file", "testdata/server1.key", "The TLS key file")
+	jsonDBFile = flag.String("json_db_file", "testdata/route_guide_db.json", "A json file containing a list of features")
+	port       = flag.Int("port", 10000, "The server port")
+)
+
+type routeGuideServer struct {
+	savedFeatures []*pb.Feature
+	routeNotes    map[string][]*pb.RouteNote
+}
+
+// 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{Location: point}, nil
+}
+
+// ListFeatures lists all features contained within the given bounding Rectangle.
+func (s *routeGuideServer) ListFeatures(rect *pb.Rectangle, stream pb.RouteGuide_ListFeaturesServer) error {
+	for _, feature := range s.savedFeatures {
+		if inRange(feature.Location, rect) {
+			if err := stream.Send(feature); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// 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
+	}
+}
+
+// RouteChat receives a stream of message/location pairs, and responds with a stream of all
+// previous messages at each of those locations.
+func (s *routeGuideServer) RouteChat(stream pb.RouteGuide_RouteChatServer) error {
+	for {
+		in, err := stream.Recv()
+		if err == io.EOF {
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+		key := serialize(in.Location)
+		if _, present := s.routeNotes[key]; !present {
+			s.routeNotes[key] = []*pb.RouteNote{in}
+		} else {
+			s.routeNotes[key] = append(s.routeNotes[key], in)
+		}
+		for _, note := range s.routeNotes[key] {
+			if err := stream.Send(note); err != nil {
+				return err
+			}
+		}
+	}
+}
+
+// loadFeatures loads features from a JSON file.
+func (s *routeGuideServer) loadFeatures(filePath string) {
+	file, err := ioutil.ReadFile(filePath)
+	if err != nil {
+		grpclog.Fatalf("Failed to load default features: %v", err)
+	}
+	if err := json.Unmarshal(file, &s.savedFeatures); err != nil {
+		grpclog.Fatalf("Failed to load default features: %v", err)
+	}
+}
+
+func toRadians(num float64) float64 {
+	return num * math.Pi / float64(180)
+}
+
+// calcDistance calculates the distance between two points using the "haversine" formula.
+// This code was taken from http://www.movable-type.co.uk/scripts/latlong.html.
+func calcDistance(p1 *pb.Point, p2 *pb.Point) int32 {
+	const CordFactor float64 = 1e7
+	const R float64 = float64(6371000) // metres
+	lat1 := float64(p1.Latitude) / CordFactor
+	lat2 := float64(p2.Latitude) / CordFactor
+	lng1 := float64(p1.Longitude) / CordFactor
+	lng2 := float64(p2.Longitude) / CordFactor
+	φ1 := toRadians(lat1)
+	φ2 := toRadians(lat2)
+	Δφ := toRadians(lat2 - lat1)
+	Δλ := toRadians(lng2 - lng1)
+
+	a := math.Sin(Δφ/2)*math.Sin(Δφ/2) +
+		math.Cos(φ1)*math.Cos(φ2)*
+			math.Sin(Δλ/2)*math.Sin(Δλ/2)
+	c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
+
+	distance := R * c
+	return int32(distance)
+}
+
+func inRange(point *pb.Point, rect *pb.Rectangle) bool {
+	left := math.Min(float64(rect.Lo.Longitude), float64(rect.Hi.Longitude))
+	right := math.Max(float64(rect.Lo.Longitude), float64(rect.Hi.Longitude))
+	top := math.Max(float64(rect.Lo.Latitude), float64(rect.Hi.Latitude))
+	bottom := math.Min(float64(rect.Lo.Latitude), float64(rect.Hi.Latitude))
+
+	if float64(point.Longitude) >= left &&
+		float64(point.Longitude) <= right &&
+		float64(point.Latitude) >= bottom &&
+		float64(point.Latitude) <= top {
+		return true
+	}
+	return false
+}
+
+func serialize(point *pb.Point) string {
+	return fmt.Sprintf("%d %d", point.Latitude, point.Longitude)
+}
+
+func newServer() *routeGuideServer {
+	s := new(routeGuideServer)
+	s.loadFeatures(*jsonDBFile)
+	s.routeNotes = make(map[string][]*pb.RouteNote)
+	return s
+}
+
+func main() {
+	flag.Parse()
+	lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
+	if err != nil {
+		grpclog.Fatalf("failed to listen: %v", err)
+	}
+	var opts []grpc.ServerOption
+	if *tls {
+		creds, err := credentials.NewServerTLSFromFile(*certFile, *keyFile)
+		if err != nil {
+			grpclog.Fatalf("Failed to generate credentials %v", err)
+		}
+		opts = []grpc.ServerOption{grpc.Creds(creds)}
+	}
+	grpcServer := grpc.NewServer(opts...)
+	pb.RegisterRouteGuideServer(grpcServer, newServer())
+	grpcServer.Serve(lis)
+}