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vendor/google.golang.org/grpc/examples/route_guide/client/client.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 client that demonstrates how to use gRPC-Go libraries
+// to perform unary, client streaming, server streaming and full duplex RPCs.
+//
+// It interacts with the route guide service whose definition can be found in proto/route_guide.proto.
+package main
+
+import (
+	"flag"
+	"io"
+	"math/rand"
+	"time"
+
+	"golang.org/x/net/context"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
+	pb "google.golang.org/grpc/examples/route_guide/routeguide"
+	"google.golang.org/grpc/grpclog"
+)
+
+var (
+	tls                = flag.Bool("tls", false, "Connection uses TLS if true, else plain TCP")
+	caFile             = flag.String("ca_file", "testdata/ca.pem", "The file containning the CA root cert file")
+	serverAddr         = flag.String("server_addr", "127.0.0.1:10000", "The server address in the format of host:port")
+	serverHostOverride = flag.String("server_host_override", "x.test.youtube.com", "The server name use to verify the hostname returned by TLS handshake")
+)
+
+// printFeature gets the feature for the given point.
+func printFeature(client pb.RouteGuideClient, point *pb.Point) {
+	grpclog.Printf("Getting feature for point (%d, %d)", point.Latitude, point.Longitude)
+	feature, err := client.GetFeature(context.Background(), point)
+	if err != nil {
+		grpclog.Fatalf("%v.GetFeatures(_) = _, %v: ", client, err)
+	}
+	grpclog.Println(feature)
+}
+
+// printFeatures lists all the features within the given bounding Rectangle.
+func printFeatures(client pb.RouteGuideClient, rect *pb.Rectangle) {
+	grpclog.Printf("Looking for features within %v", rect)
+	stream, err := client.ListFeatures(context.Background(), rect)
+	if err != nil {
+		grpclog.Fatalf("%v.ListFeatures(_) = _, %v", client, err)
+	}
+	for {
+		feature, err := stream.Recv()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			grpclog.Fatalf("%v.ListFeatures(_) = _, %v", client, err)
+		}
+		grpclog.Println(feature)
+	}
+}
+
+// runRecordRoute sends a sequence of points to server and expects to get a RouteSummary from server.
+func runRecordRoute(client pb.RouteGuideClient) {
+	// Create a random number of random points
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+	pointCount := int(r.Int31n(100)) + 2 // Traverse at least two points
+	var points []*pb.Point
+	for i := 0; i < pointCount; i++ {
+		points = append(points, randomPoint(r))
+	}
+	grpclog.Printf("Traversing %d points.", len(points))
+	stream, err := client.RecordRoute(context.Background())
+	if err != nil {
+		grpclog.Fatalf("%v.RecordRoute(_) = _, %v", client, err)
+	}
+	for _, point := range points {
+		if err := stream.Send(point); err != nil {
+			grpclog.Fatalf("%v.Send(%v) = %v", stream, point, err)
+		}
+	}
+	reply, err := stream.CloseAndRecv()
+	if err != nil {
+		grpclog.Fatalf("%v.CloseAndRecv() got error %v, want %v", stream, err, nil)
+	}
+	grpclog.Printf("Route summary: %v", reply)
+}
+
+// runRouteChat receives a sequence of route notes, while sending notes for various locations.
+func runRouteChat(client pb.RouteGuideClient) {
+	notes := []*pb.RouteNote{
+		{&pb.Point{Latitude: 0, Longitude: 1}, "First message"},
+		{&pb.Point{Latitude: 0, Longitude: 2}, "Second message"},
+		{&pb.Point{Latitude: 0, Longitude: 3}, "Third message"},
+		{&pb.Point{Latitude: 0, Longitude: 1}, "Fourth message"},
+		{&pb.Point{Latitude: 0, Longitude: 2}, "Fifth message"},
+		{&pb.Point{Latitude: 0, Longitude: 3}, "Sixth message"},
+	}
+	stream, err := client.RouteChat(context.Background())
+	if err != nil {
+		grpclog.Fatalf("%v.RouteChat(_) = _, %v", client, err)
+	}
+	waitc := make(chan struct{})
+	go func() {
+		for {
+			in, err := stream.Recv()
+			if err == io.EOF {
+				// read done.
+				close(waitc)
+				return
+			}
+			if err != nil {
+				grpclog.Fatalf("Failed to receive a note : %v", err)
+			}
+			grpclog.Printf("Got message %s at point(%d, %d)", in.Message, in.Location.Latitude, in.Location.Longitude)
+		}
+	}()
+	for _, note := range notes {
+		if err := stream.Send(note); err != nil {
+			grpclog.Fatalf("Failed to send a note: %v", err)
+		}
+	}
+	stream.CloseSend()
+	<-waitc
+}
+
+func randomPoint(r *rand.Rand) *pb.Point {
+	lat := (r.Int31n(180) - 90) * 1e7
+	long := (r.Int31n(360) - 180) * 1e7
+	return &pb.Point{Latitude: lat, Longitude: long}
+}
+
+func main() {
+	flag.Parse()
+	var opts []grpc.DialOption
+	if *tls {
+		var sn string
+		if *serverHostOverride != "" {
+			sn = *serverHostOverride
+		}
+		var creds credentials.TransportCredentials
+		if *caFile != "" {
+			var err error
+			creds, err = credentials.NewClientTLSFromFile(*caFile, sn)
+			if err != nil {
+				grpclog.Fatalf("Failed to create TLS credentials %v", err)
+			}
+		} else {
+			creds = credentials.NewClientTLSFromCert(nil, sn)
+		}
+		opts = append(opts, grpc.WithTransportCredentials(creds))
+	} else {
+		opts = append(opts, grpc.WithInsecure())
+	}
+	conn, err := grpc.Dial(*serverAddr, opts...)
+	if err != nil {
+		grpclog.Fatalf("fail to dial: %v", err)
+	}
+	defer conn.Close()
+	client := pb.NewRouteGuideClient(conn)
+
+	// Looking for a valid feature
+	printFeature(client, &pb.Point{Latitude: 409146138, Longitude: -746188906})
+
+	// Feature missing.
+	printFeature(client, &pb.Point{Latitude: 0, Longitude: 0})
+
+	// Looking for features between 40, -75 and 42, -73.
+	printFeatures(client, &pb.Rectangle{
+		Lo: &pb.Point{Latitude: 400000000, Longitude: -750000000},
+		Hi: &pb.Point{Latitude: 420000000, Longitude: -730000000},
+	})
+
+	// RecordRoute
+	runRecordRoute(client)
+
+	// RouteChat
+	runRouteChat(client)
+}