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 <grpc/grpc.h>
27 #include <grpcpp/server.h>
28 #include <grpcpp/server_builder.h>
29 #include <grpcpp/server_context.h>
30 #include <grpcpp/security/server_credentials.h>
31 #include "helper.h"
32 #include "route_guide.grpc.pb.h"
33
34 using grpc::Server;
35 using grpc::ServerBuilder;
36 using grpc::ServerContext;
37 using grpc::ServerReader;
38 using grpc::ServerReaderWriter;
39 using grpc::ServerWriter;
40 using grpc::Status;
41 using routeguide::Point;
42 using routeguide::Feature;
43 using routeguide::Rectangle;
44 using routeguide::RouteSummary;
45 using routeguide::RouteNote;
46 using routeguide::RouteGuide;
47 using std::chrono::system_clock;
48
49
ConvertToRadians(float num)50 float ConvertToRadians(float num) {
51 return num * 3.1415926 /180;
52 }
53
54 // The formula is based on http://mathforum.org/library/drmath/view/51879.html
GetDistance(const Point & start,const Point & end)55 float GetDistance(const Point& start, const Point& end) {
56 const float kCoordFactor = 10000000.0;
57 float lat_1 = start.latitude() / kCoordFactor;
58 float lat_2 = end.latitude() / kCoordFactor;
59 float lon_1 = start.longitude() / kCoordFactor;
60 float lon_2 = end.longitude() / kCoordFactor;
61 float lat_rad_1 = ConvertToRadians(lat_1);
62 float lat_rad_2 = ConvertToRadians(lat_2);
63 float delta_lat_rad = ConvertToRadians(lat_2-lat_1);
64 float delta_lon_rad = ConvertToRadians(lon_2-lon_1);
65
66 float a = pow(sin(delta_lat_rad/2), 2) + cos(lat_rad_1) * cos(lat_rad_2) *
67 pow(sin(delta_lon_rad/2), 2);
68 float c = 2 * atan2(sqrt(a), sqrt(1-a));
69 int R = 6371000; // metres
70
71 return R * c;
72 }
73
GetFeatureName(const Point & point,const std::vector<Feature> & feature_list)74 std::string GetFeatureName(const Point& point,
75 const std::vector<Feature>& feature_list) {
76 for (const Feature& f : feature_list) {
77 if (f.location().latitude() == point.latitude() &&
78 f.location().longitude() == point.longitude()) {
79 return f.name();
80 }
81 }
82 return "";
83 }
84
85 class RouteGuideImpl final : public RouteGuide::Service {
86 public:
RouteGuideImpl(const std::string & db)87 explicit RouteGuideImpl(const std::string& db) {
88 routeguide::ParseDb(db, &feature_list_);
89 }
90
GetFeature(ServerContext * context,const Point * point,Feature * feature)91 Status GetFeature(ServerContext* context, const Point* point,
92 Feature* feature) override {
93 feature->set_name(GetFeatureName(*point, feature_list_));
94 feature->mutable_location()->CopyFrom(*point);
95 return Status::OK;
96 }
97
ListFeatures(ServerContext * context,const routeguide::Rectangle * rectangle,ServerWriter<Feature> * writer)98 Status ListFeatures(ServerContext* context,
99 const routeguide::Rectangle* rectangle,
100 ServerWriter<Feature>* writer) override {
101 auto lo = rectangle->lo();
102 auto hi = rectangle->hi();
103 long left = (std::min)(lo.longitude(), hi.longitude());
104 long right = (std::max)(lo.longitude(), hi.longitude());
105 long top = (std::max)(lo.latitude(), hi.latitude());
106 long bottom = (std::min)(lo.latitude(), hi.latitude());
107 for (const Feature& f : feature_list_) {
108 if (f.location().longitude() >= left &&
109 f.location().longitude() <= right &&
110 f.location().latitude() >= bottom &&
111 f.location().latitude() <= top) {
112 writer->Write(f);
113 }
114 }
115 return Status::OK;
116 }
117
RecordRoute(ServerContext * context,ServerReader<Point> * reader,RouteSummary * summary)118 Status RecordRoute(ServerContext* context, ServerReader<Point>* reader,
119 RouteSummary* summary) override {
120 Point point;
121 int point_count = 0;
122 int feature_count = 0;
123 float distance = 0.0;
124 Point previous;
125
126 system_clock::time_point start_time = system_clock::now();
127 while (reader->Read(&point)) {
128 point_count++;
129 if (!GetFeatureName(point, feature_list_).empty()) {
130 feature_count++;
131 }
132 if (point_count != 1) {
133 distance += GetDistance(previous, point);
134 }
135 previous = point;
136 }
137 system_clock::time_point end_time = system_clock::now();
138 summary->set_point_count(point_count);
139 summary->set_feature_count(feature_count);
140 summary->set_distance(static_cast<long>(distance));
141 auto secs = std::chrono::duration_cast<std::chrono::seconds>(
142 end_time - start_time);
143 summary->set_elapsed_time(secs.count());
144
145 return Status::OK;
146 }
147
RouteChat(ServerContext * context,ServerReaderWriter<RouteNote,RouteNote> * stream)148 Status RouteChat(ServerContext* context,
149 ServerReaderWriter<RouteNote, RouteNote>* stream) override {
150 std::vector<RouteNote> received_notes;
151 RouteNote note;
152 while (stream->Read(¬e)) {
153 for (const RouteNote& n : received_notes) {
154 if (n.location().latitude() == note.location().latitude() &&
155 n.location().longitude() == note.location().longitude()) {
156 stream->Write(n);
157 }
158 }
159 received_notes.push_back(note);
160 }
161
162 return Status::OK;
163 }
164
165 private:
166
167 std::vector<Feature> feature_list_;
168 };
169
RunServer(const std::string & db_path)170 void RunServer(const std::string& db_path) {
171 std::string server_address("0.0.0.0:50051");
172 RouteGuideImpl service(db_path);
173
174 ServerBuilder builder;
175 builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
176 builder.RegisterService(&service);
177 std::unique_ptr<Server> server(builder.BuildAndStart());
178 std::cout << "Server listening on " << server_address << std::endl;
179 server->Wait();
180 }
181
main(int argc,char ** argv)182 int main(int argc, char** argv) {
183 // Expect only arg: --db_path=path/to/route_guide_db.json.
184 std::string db = routeguide::GetDbFileContent(argc, argv);
185 RunServer(db);
186
187 return 0;
188 }
189