1 /*
2 *
3 * Copyright 2015 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19 #include <algorithm>
20 #include <chrono>
21 #include <cmath>
22 #include <iostream>
23 #include <memory>
24 #include <string>
25
26 #include "helper.h"
27
28 #include <grpc/grpc.h>
29 #include <grpcpp/security/server_credentials.h>
30 #include <grpcpp/server.h>
31 #include <grpcpp/server_builder.h>
32 #include <grpcpp/server_context.h>
33 #ifdef BAZEL_BUILD
34 #include "examples/protos/route_guide.grpc.pb.h"
35 #else
36 #include "route_guide.grpc.pb.h"
37 #endif
38
39 using grpc::Server;
40 using grpc::ServerBuilder;
41 using grpc::ServerContext;
42 using grpc::ServerReader;
43 using grpc::ServerReaderWriter;
44 using grpc::ServerWriter;
45 using grpc::Status;
46 using routeguide::Feature;
47 using routeguide::Point;
48 using routeguide::Rectangle;
49 using routeguide::RouteGuide;
50 using routeguide::RouteNote;
51 using routeguide::RouteSummary;
52 using std::chrono::system_clock;
53
ConvertToRadians(float num)54 float ConvertToRadians(float num) { return num * 3.1415926 / 180; }
55
56 // The formula is based on http://mathforum.org/library/drmath/view/51879.html
GetDistance(const Point & start,const Point & end)57 float GetDistance(const Point& start, const Point& end) {
58 const float kCoordFactor = 10000000.0;
59 float lat_1 = start.latitude() / kCoordFactor;
60 float lat_2 = end.latitude() / kCoordFactor;
61 float lon_1 = start.longitude() / kCoordFactor;
62 float lon_2 = end.longitude() / kCoordFactor;
63 float lat_rad_1 = ConvertToRadians(lat_1);
64 float lat_rad_2 = ConvertToRadians(lat_2);
65 float delta_lat_rad = ConvertToRadians(lat_2 - lat_1);
66 float delta_lon_rad = ConvertToRadians(lon_2 - lon_1);
67
68 float a = pow(sin(delta_lat_rad / 2), 2) +
69 cos(lat_rad_1) * cos(lat_rad_2) * pow(sin(delta_lon_rad / 2), 2);
70 float c = 2 * atan2(sqrt(a), sqrt(1 - a));
71 int R = 6371000; // metres
72
73 return R * c;
74 }
75
GetFeatureName(const Point & point,const std::vector<Feature> & feature_list)76 std::string GetFeatureName(const Point& point,
77 const std::vector<Feature>& feature_list) {
78 for (const Feature& f : feature_list) {
79 if (f.location().latitude() == point.latitude() &&
80 f.location().longitude() == point.longitude()) {
81 return f.name();
82 }
83 }
84 return "";
85 }
86
87 class RouteGuideImpl final : public RouteGuide::Service {
88 public:
RouteGuideImpl(const std::string & db)89 explicit RouteGuideImpl(const std::string& db) {
90 routeguide::ParseDb(db, &feature_list_);
91 }
92
GetFeature(ServerContext * context,const Point * point,Feature * feature)93 Status GetFeature(ServerContext* context, const Point* point,
94 Feature* feature) override {
95 feature->set_name(GetFeatureName(*point, feature_list_));
96 feature->mutable_location()->CopyFrom(*point);
97 return Status::OK;
98 }
99
ListFeatures(ServerContext * context,const routeguide::Rectangle * rectangle,ServerWriter<Feature> * writer)100 Status ListFeatures(ServerContext* context,
101 const routeguide::Rectangle* rectangle,
102 ServerWriter<Feature>* writer) override {
103 auto lo = rectangle->lo();
104 auto hi = rectangle->hi();
105 long left = (std::min)(lo.longitude(), hi.longitude());
106 long right = (std::max)(lo.longitude(), hi.longitude());
107 long top = (std::max)(lo.latitude(), hi.latitude());
108 long bottom = (std::min)(lo.latitude(), hi.latitude());
109 for (const Feature& f : feature_list_) {
110 if (f.location().longitude() >= left &&
111 f.location().longitude() <= right &&
112 f.location().latitude() >= bottom && f.location().latitude() <= top) {
113 writer->Write(f);
114 }
115 }
116 return Status::OK;
117 }
118
RecordRoute(ServerContext * context,ServerReader<Point> * reader,RouteSummary * summary)119 Status RecordRoute(ServerContext* context, ServerReader<Point>* reader,
120 RouteSummary* summary) override {
121 Point point;
122 int point_count = 0;
123 int feature_count = 0;
124 float distance = 0.0;
125 Point previous;
126
127 system_clock::time_point start_time = system_clock::now();
128 while (reader->Read(&point)) {
129 point_count++;
130 if (!GetFeatureName(point, feature_list_).empty()) {
131 feature_count++;
132 }
133 if (point_count != 1) {
134 distance += GetDistance(previous, point);
135 }
136 previous = point;
137 }
138 system_clock::time_point end_time = system_clock::now();
139 summary->set_point_count(point_count);
140 summary->set_feature_count(feature_count);
141 summary->set_distance(static_cast<long>(distance));
142 auto secs =
143 std::chrono::duration_cast<std::chrono::seconds>(end_time - start_time);
144 summary->set_elapsed_time(secs.count());
145
146 return Status::OK;
147 }
148
RouteChat(ServerContext * context,ServerReaderWriter<RouteNote,RouteNote> * stream)149 Status RouteChat(ServerContext* context,
150 ServerReaderWriter<RouteNote, RouteNote>* stream) override {
151 RouteNote note;
152 while (stream->Read(¬e)) {
153 std::unique_lock<std::mutex> lock(mu_);
154 for (const RouteNote& n : received_notes_) {
155 if (n.location().latitude() == note.location().latitude() &&
156 n.location().longitude() == note.location().longitude()) {
157 stream->Write(n);
158 }
159 }
160 received_notes_.push_back(note);
161 }
162
163 return Status::OK;
164 }
165
166 private:
167 std::vector<Feature> feature_list_;
168 std::mutex mu_;
169 std::vector<RouteNote> received_notes_;
170 };
171
RunServer(const std::string & db_path)172 void RunServer(const std::string& db_path) {
173 std::string server_address("0.0.0.0:50051");
174 RouteGuideImpl service(db_path);
175
176 ServerBuilder builder;
177 builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
178 builder.RegisterService(&service);
179 std::unique_ptr<Server> server(builder.BuildAndStart());
180 std::cout << "Server listening on " << server_address << std::endl;
181 server->Wait();
182 }
183
main(int argc,char ** argv)184 int main(int argc, char** argv) {
185 // Expect only arg: --db_path=path/to/route_guide_db.json.
186 std::string db = routeguide::GetDbFileContent(argc, argv);
187 RunServer(db);
188
189 return 0;
190 }
191