Initial checkin of gRPC to third_party/

third_party/grpc/examples/cpp/route_guide/route_guide_client.cc

Index: third_party/grpc/examples/cpp/route_guide/route_guide_client.cc
diff --git a/third_party/grpc/examples/cpp/route_guide/route_guide_client.cc b/third_party/grpc/examples/cpp/route_guide/route_guide_client.cc
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index 0000000000000000000000000000000000000000..b9abe72a5bd7a8d453f1405d50f3b9426a16717e
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+++ b/third_party/grpc/examples/cpp/route_guide/route_guide_client.cc
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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.
+ *
+ */
+
+#include <chrono>
+#include <iostream>
+#include <memory>
+#include <random>
+#include <string>
+#include <thread>
+
+#include <grpc/grpc.h>
+#include <grpc++/channel.h>
+#include <grpc++/client_context.h>
+#include <grpc++/create_channel.h>
+#include <grpc++/security/credentials.h>
+#include "helper.h"
+#include "route_guide.grpc.pb.h"
+
+using grpc::Channel;
+using grpc::ClientContext;
+using grpc::ClientReader;
+using grpc::ClientReaderWriter;
+using grpc::ClientWriter;
+using grpc::Status;
+using routeguide::Point;
+using routeguide::Feature;
+using routeguide::Rectangle;
+using routeguide::RouteSummary;
+using routeguide::RouteNote;
+using routeguide::RouteGuide;
+
+Point MakePoint(long latitude, long longitude) {
+  Point p;
+  p.set_latitude(latitude);
+  p.set_longitude(longitude);
+  return p;
+}
+
+Feature MakeFeature(const std::string& name,
+                    long latitude, long longitude) {
+  Feature f;
+  f.set_name(name);
+  f.mutable_location()->CopyFrom(MakePoint(latitude, longitude));
+  return f;
+}
+
+RouteNote MakeRouteNote(const std::string& message,
+                        long latitude, long longitude) {
+  RouteNote n;
+  n.set_message(message);
+  n.mutable_location()->CopyFrom(MakePoint(latitude, longitude));
+  return n;
+}
+
+class RouteGuideClient {
+ public:
+  RouteGuideClient(std::shared_ptr<Channel> channel, const std::string& db)
+      : stub_(RouteGuide::NewStub(channel)) {
+    routeguide::ParseDb(db, &feature_list_);
+  }
+
+  void GetFeature() {
+    Point point;
+    Feature feature;
+    point = MakePoint(409146138, -746188906);
+    GetOneFeature(point, &feature);
+    point = MakePoint(0, 0);
+    GetOneFeature(point, &feature);
+  }
+
+  void ListFeatures() {
+    routeguide::Rectangle rect;
+    Feature feature;
+    ClientContext context;
+
+    rect.mutable_lo()->set_latitude(400000000);
+    rect.mutable_lo()->set_longitude(-750000000);
+    rect.mutable_hi()->set_latitude(420000000);
+    rect.mutable_hi()->set_longitude(-730000000);
+    std::cout << "Looking for features between 40, -75 and 42, -73"
+              << std::endl;
+
+    std::unique_ptr<ClientReader<Feature> > reader(
+        stub_->ListFeatures(&context, rect));
+    while (reader->Read(&feature)) {
+      std::cout << "Found feature called "
+                << feature.name() << " at "
+                << feature.location().latitude()/kCoordFactor_ << ", "
+                << feature.location().longitude()/kCoordFactor_ << std::endl;
+    }
+    Status status = reader->Finish();
+    if (status.ok()) {
+      std::cout << "ListFeatures rpc succeeded." << std::endl;
+    } else {
+      std::cout << "ListFeatures rpc failed." << std::endl;
+    }
+  }
+
+  void RecordRoute() {
+    Point point;
+    RouteSummary stats;
+    ClientContext context;
+    const int kPoints = 10;
+    unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
+
+    std::default_random_engine generator(seed);
+    std::uniform_int_distribution<int> feature_distribution(
+        0, feature_list_.size() - 1);
+    std::uniform_int_distribution<int> delay_distribution(
+        500, 1500);
+
+    std::unique_ptr<ClientWriter<Point> > writer(
+        stub_->RecordRoute(&context, &stats));
+    for (int i = 0; i < kPoints; i++) {
+      const Feature& f = feature_list_[feature_distribution(generator)];
+      std::cout << "Visiting point "
+                << f.location().latitude()/kCoordFactor_ << ", "
+                << f.location().longitude()/kCoordFactor_ << std::endl;
+      if (!writer->Write(f.location())) {
+        // Broken stream.
+        break;
+      }
+      std::this_thread::sleep_for(std::chrono::milliseconds(
+          delay_distribution(generator)));
+    }
+    writer->WritesDone();
+    Status status = writer->Finish();
+    if (status.ok()) {
+      std::cout << "Finished trip with " << stats.point_count() << " points\n"
+                << "Passed " << stats.feature_count() << " features\n"
+                << "Travelled " << stats.distance() << " meters\n"
+                << "It took " << stats.elapsed_time() << " seconds"
+                << std::endl;
+    } else {
+      std::cout << "RecordRoute rpc failed." << std::endl;
+    }
+  }
+
+  void RouteChat() {
+    ClientContext context;
+
+    std::shared_ptr<ClientReaderWriter<RouteNote, RouteNote> > stream(
+        stub_->RouteChat(&context));
+
+    std::thread writer([stream]() {
+      std::vector<RouteNote> notes{
+        MakeRouteNote("First message", 0, 0),
+        MakeRouteNote("Second message", 0, 1),
+        MakeRouteNote("Third message", 1, 0),
+        MakeRouteNote("Fourth message", 0, 0)};
+      for (const RouteNote& note : notes) {
+        std::cout << "Sending message " << note.message()
+                  << " at " << note.location().latitude() << ", "
+                  << note.location().longitude() << std::endl;
+        stream->Write(note);
+      }
+      stream->WritesDone();
+    });
+
+    RouteNote server_note;
+    while (stream->Read(&server_note)) {
+      std::cout << "Got message " << server_note.message()
+                << " at " << server_note.location().latitude() << ", "
+                << server_note.location().longitude() << std::endl;
+    }
+    writer.join();
+    Status status = stream->Finish();
+    if (!status.ok()) {
+      std::cout << "RouteChat rpc failed." << std::endl;
+    }
+  }
+
+ private:
+
+  bool GetOneFeature(const Point& point, Feature* feature) {
+    ClientContext context;
+    Status status = stub_->GetFeature(&context, point, feature);
+    if (!status.ok()) {
+      std::cout << "GetFeature rpc failed." << std::endl;
+      return false;
+    }
+    if (!feature->has_location()) {
+      std::cout << "Server returns incomplete feature." << std::endl;
+      return false;
+    }
+    if (feature->name().empty()) {
+      std::cout << "Found no feature at "
+                << feature->location().latitude()/kCoordFactor_ << ", "
+                << feature->location().longitude()/kCoordFactor_ << std::endl;
+    } else {
+      std::cout << "Found feature called " << feature->name()  << " at "
+                << feature->location().latitude()/kCoordFactor_ << ", "
+                << feature->location().longitude()/kCoordFactor_ << std::endl;
+    }
+    return true;
+  }
+
+  const float kCoordFactor_ = 10000000.0;
+  std::unique_ptr<RouteGuide::Stub> stub_;
+  std::vector<Feature> feature_list_;
+};
+
+int main(int argc, char** argv) {
+  // Expect only arg: --db_path=path/to/route_guide_db.json.
+  std::string db = routeguide::GetDbFileContent(argc, argv);
+  RouteGuideClient guide(
+      grpc::CreateChannel("localhost:50051",
+                          grpc::InsecureChannelCredentials()),
+      db);
+
+  std::cout << "-------------- GetFeature --------------" << std::endl;
+  guide.GetFeature();
+  std::cout << "-------------- ListFeatures --------------" << std::endl;
+  guide.ListFeatures();
+  std::cout << "-------------- RecordRoute --------------" << std::endl;
+  guide.RecordRoute();
+  std::cout << "-------------- RouteChat --------------" << std::endl;
+  guide.RouteChat();
+
+  return 0;
+}