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 <grpc/grpc.h>
20 #include <grpcpp/security/server_credentials.h>
21 #include <grpcpp/server.h>
22 #include <grpcpp/server_builder.h>
23 #include <grpcpp/server_context.h>
24
25 #include <algorithm>
26 #include <chrono>
27 #include <cmath>
28 #include <iostream>
29 #include <memory>
30 #include <string>
31
32 #include "absl/flags/parse.h"
33 #include "helper.h"
34 #ifdef BAZEL_BUILD
35 #include "examples/protos/route_guide.grpc.pb.h"
36 #else
37 #include "route_guide.grpc.pb.h"
38 #endif
39
40 using grpc::Server;
41 using grpc::ServerBuilder;
42 using grpc::ServerContext;
43 using grpc::ServerReader;
44 using grpc::ServerReaderWriter;
45 using grpc::ServerWriter;
46 using grpc::Status;
47 using routeguide::Feature;
48 using routeguide::Point;
49 using routeguide::Rectangle;
50 using routeguide::RouteGuide;
51 using routeguide::RouteNote;
52 using routeguide::RouteSummary;
53 using std::chrono::system_clock;
54
ConvertToRadians(float num)55 float ConvertToRadians(float num) { return num * 3.1415926 / 180; }
56
57 // The formula is based on http://mathforum.org/library/drmath/view/51879.html
GetDistance(const Point & start,const Point & end)58 float GetDistance(const Point& start, const Point& end) {
59 const float kCoordFactor = 10000000.0;
60 float lat_1 = start.latitude() / kCoordFactor;
61 float lat_2 = end.latitude() / kCoordFactor;
62 float lon_1 = start.longitude() / kCoordFactor;
63 float lon_2 = end.longitude() / kCoordFactor;
64 float lat_rad_1 = ConvertToRadians(lat_1);
65 float lat_rad_2 = ConvertToRadians(lat_2);
66 float delta_lat_rad = ConvertToRadians(lat_2 - lat_1);
67 float delta_lon_rad = ConvertToRadians(lon_2 - lon_1);
68
69 float a = pow(sin(delta_lat_rad / 2), 2) +
70 cos(lat_rad_1) * cos(lat_rad_2) * pow(sin(delta_lon_rad / 2), 2);
71 float c = 2 * atan2(sqrt(a), sqrt(1 - a));
72 int R = 6371000; // metres
73
74 return R * c;
75 }
76
GetFeatureName(const Point & point,const std::vector<Feature> & feature_list)77 std::string GetFeatureName(const Point& point,
78 const std::vector<Feature>& feature_list) {
79 for (const Feature& f : feature_list) {
80 if (f.location().latitude() == point.latitude() &&
81 f.location().longitude() == point.longitude()) {
82 return f.name();
83 }
84 }
85 return "";
86 }
87
88 class RouteGuideImpl final : public RouteGuide::Service {
89 public:
RouteGuideImpl(const std::string & db)90 explicit RouteGuideImpl(const std::string& db) {
91 routeguide::ParseDb(db, &feature_list_);
92 }
93
GetFeature(ServerContext * context,const Point * point,Feature * feature)94 Status GetFeature(ServerContext* context, const Point* point,
95 Feature* feature) override {
96 feature->set_name(GetFeatureName(*point, feature_list_));
97 feature->mutable_location()->CopyFrom(*point);
98 return Status::OK;
99 }
100
ListFeatures(ServerContext * context,const routeguide::Rectangle * rectangle,ServerWriter<Feature> * writer)101 Status ListFeatures(ServerContext* context,
102 const routeguide::Rectangle* rectangle,
103 ServerWriter<Feature>* writer) override {
104 auto lo = rectangle->lo();
105 auto hi = rectangle->hi();
106 long left = (std::min)(lo.longitude(), hi.longitude());
107 long right = (std::max)(lo.longitude(), hi.longitude());
108 long top = (std::max)(lo.latitude(), hi.latitude());
109 long bottom = (std::min)(lo.latitude(), hi.latitude());
110 for (const Feature& f : feature_list_) {
111 if (f.location().longitude() >= left &&
112 f.location().longitude() <= right &&
113 f.location().latitude() >= bottom && f.location().latitude() <= top) {
114 writer->Write(f);
115 }
116 }
117 return Status::OK;
118 }
119
RecordRoute(ServerContext * context,ServerReader<Point> * reader,RouteSummary * summary)120 Status RecordRoute(ServerContext* context, ServerReader<Point>* reader,
121 RouteSummary* summary) override {
122 Point point;
123 int point_count = 0;
124 int feature_count = 0;
125 float distance = 0.0;
126 Point previous;
127
128 system_clock::time_point start_time = system_clock::now();
129 while (reader->Read(&point)) {
130 point_count++;
131 if (!GetFeatureName(point, feature_list_).empty()) {
132 feature_count++;
133 }
134 if (point_count != 1) {
135 distance += GetDistance(previous, point);
136 }
137 previous = point;
138 }
139 system_clock::time_point end_time = system_clock::now();
140 summary->set_point_count(point_count);
141 summary->set_feature_count(feature_count);
142 summary->set_distance(static_cast<long>(distance));
143 auto secs =
144 std::chrono::duration_cast<std::chrono::seconds>(end_time - start_time);
145 summary->set_elapsed_time(secs.count());
146
147 return Status::OK;
148 }
149
RouteChat(ServerContext * context,ServerReaderWriter<RouteNote,RouteNote> * stream)150 Status RouteChat(ServerContext* context,
151 ServerReaderWriter<RouteNote, RouteNote>* stream) override {
152 RouteNote note;
153 while (stream->Read(¬e)) {
154 std::unique_lock<std::mutex> lock(mu_);
155 for (const RouteNote& n : received_notes_) {
156 if (n.location().latitude() == note.location().latitude() &&
157 n.location().longitude() == note.location().longitude()) {
158 stream->Write(n);
159 }
160 }
161 received_notes_.push_back(note);
162 }
163
164 return Status::OK;
165 }
166
167 private:
168 std::vector<Feature> feature_list_;
169 std::mutex mu_;
170 std::vector<RouteNote> received_notes_;
171 };
172
RunServer(const std::string & db_path)173 void RunServer(const std::string& db_path) {
174 std::string server_address("0.0.0.0:50051");
175 RouteGuideImpl service(db_path);
176
177 ServerBuilder builder;
178 builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
179 builder.RegisterService(&service);
180 std::unique_ptr<Server> server(builder.BuildAndStart());
181 std::cout << "Server listening on " << server_address << std::endl;
182 server->Wait();
183 }
184
main(int argc,char ** argv)185 int main(int argc, char** argv) {
186 absl::ParseCommandLine(argc, argv);
187 // Expect only arg: --db_path=path/to/route_guide_db.json.
188 std::string db = routeguide::GetDbFileContent(argc, argv);
189 RunServer(db);
190
191 return 0;
192 }
193