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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <algorithm>
#include <chrono>
#include <cmath>
#include <iostream>
#include <memory>
#include <string>
#include "helper.h"
#include <grpc/grpc.h>
#include <grpcpp/security/server_credentials.h>
#include <grpcpp/server.h>
#include <grpcpp/server_builder.h>
#include <grpcpp/server_context.h>
#ifdef BAZEL_BUILD
#include "examples/protos/route_guide.grpc.pb.h"
#else
#include "route_guide.grpc.pb.h"
#endif
using grpc::Server;
using grpc::ServerBuilder;
using grpc::ServerContext;
using grpc::ServerReader;
using grpc::ServerReaderWriter;
using grpc::ServerWriter;
using grpc::Status;
using routeguide::Feature;
using routeguide::Point;
using routeguide::Rectangle;
using routeguide::RouteGuide;
using routeguide::RouteNote;
using routeguide::RouteSummary;
using std::chrono::system_clock;
float ConvertToRadians(float num) { return num * 3.1415926 / 180; }
// The formula is based on http://mathforum.org/library/drmath/view/51879.html
float GetDistance(const Point& start, const Point& end) {
const float kCoordFactor = 10000000.0;
float lat_1 = start.latitude() / kCoordFactor;
float lat_2 = end.latitude() / kCoordFactor;
float lon_1 = start.longitude() / kCoordFactor;
float lon_2 = end.longitude() / kCoordFactor;
float lat_rad_1 = ConvertToRadians(lat_1);
float lat_rad_2 = ConvertToRadians(lat_2);
float delta_lat_rad = ConvertToRadians(lat_2 - lat_1);
float delta_lon_rad = ConvertToRadians(lon_2 - lon_1);
float a = pow(sin(delta_lat_rad / 2), 2) +
cos(lat_rad_1) * cos(lat_rad_2) * pow(sin(delta_lon_rad / 2), 2);
float c = 2 * atan2(sqrt(a), sqrt(1 - a));
int R = 6371000; // metres
return R * c;
}
std::string GetFeatureName(const Point& point,
const std::vector<Feature>& feature_list) {
for (const Feature& f : feature_list) {
if (f.location().latitude() == point.latitude() &&
f.location().longitude() == point.longitude()) {
return f.name();
}
}
return "";
}
class RouteGuideImpl final : public RouteGuide::Service {
public:
explicit RouteGuideImpl(const std::string& db) {
routeguide::ParseDb(db, &feature_list_);
}
Status GetFeature(ServerContext* context, const Point* point,
Feature* feature) override {
feature->set_name(GetFeatureName(*point, feature_list_));
feature->mutable_location()->CopyFrom(*point);
return Status::OK;
}
Status ListFeatures(ServerContext* context,
const routeguide::Rectangle* rectangle,
ServerWriter<Feature>* writer) override {
auto lo = rectangle->lo();
auto hi = rectangle->hi();
long left = (std::min)(lo.longitude(), hi.longitude());
long right = (std::max)(lo.longitude(), hi.longitude());
long top = (std::max)(lo.latitude(), hi.latitude());
long bottom = (std::min)(lo.latitude(), hi.latitude());
for (const Feature& f : feature_list_) {
if (f.location().longitude() >= left &&
f.location().longitude() <= right &&
f.location().latitude() >= bottom && f.location().latitude() <= top) {
writer->Write(f);
}
}
return Status::OK;
}
Status RecordRoute(ServerContext* context, ServerReader<Point>* reader,
RouteSummary* summary) override {
Point point;
int point_count = 0;
int feature_count = 0;
float distance = 0.0;
Point previous;
system_clock::time_point start_time = system_clock::now();
while (reader->Read(&point)) {
point_count++;
if (!GetFeatureName(point, feature_list_).empty()) {
feature_count++;
}
if (point_count != 1) {
distance += GetDistance(previous, point);
}
previous = point;
}
system_clock::time_point end_time = system_clock::now();
summary->set_point_count(point_count);
summary->set_feature_count(feature_count);
summary->set_distance(static_cast<long>(distance));
auto secs =
std::chrono::duration_cast<std::chrono::seconds>(end_time - start_time);
summary->set_elapsed_time(secs.count());
return Status::OK;
}
Status RouteChat(ServerContext* context,
ServerReaderWriter<RouteNote, RouteNote>* stream) override {
RouteNote note;
while (stream->Read(¬e)) {
std::unique_lock<std::mutex> lock(mu_);
for (const RouteNote& n : received_notes_) {
if (n.location().latitude() == note.location().latitude() &&
n.location().longitude() == note.location().longitude()) {
stream->Write(n);
}
}
received_notes_.push_back(note);
}
return Status::OK;
}
private:
std::vector<Feature> feature_list_;
std::mutex mu_;
std::vector<RouteNote> received_notes_;
};
void RunServer(const std::string& db_path) {
std::string server_address("0.0.0.0:50051");
RouteGuideImpl service(db_path);
ServerBuilder builder;
builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
builder.RegisterService(&service);
std::unique_ptr<Server> server(builder.BuildAndStart());
std::cout << "Server listening on " << server_address << std::endl;
server->Wait();
}
int main(int argc, char** argv) {
// Expect only arg: --db_path=path/to/route_guide_db.json.
std::string db = routeguide::GetDbFileContent(argc, argv);
RunServer(db);
return 0;
}
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