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Reference Guide
df028_SQliteIPLocation.C File Reference

Detailed Description

View in nbviewer Open in SWAN Plot the location of ROOT downloads reading a remote sqlite3 file with RSqliteDS.

The world map is hold by a TH2Poly histogram which, after filling, will show the world wide dispersion of ROOT's users. To histogram filling, is done thanks to a lambda expression having as input parameters the two columns of the database: "IPLongitude' - for the longitude, and the "IPLatitude" - for the latitude. The data related to the latitude and the longitude has been provided from the log files storing the users IP. This product includes GeoLite2 data created by MaxMind, available from http://www.maxmind.com.

void df028_SQliteIPLocation() {
auto rdf = ROOT::RDF::MakeSqliteDataFrame( "http://root.cern/files/root_download_stats.sqlite", "SELECT * FROM accesslog;" );
auto f = TFile::Open("http://root.cern.ch/files/WM.root");
auto worldMap = f->Get<TH2Poly>("WMUSA");
auto fillIPLocation = [&worldMap] ( const std::string &sLongitude, const std::string &sLatitude ) {
if (!( sLongitude == "" ) && !( sLatitude == "" )) {
auto latitude = std::stof(sLatitude);
auto longitude = std::stof(sLongitude);
worldMap->Fill(longitude, latitude);
rdf.Foreach( fillIPLocation, { "IPLongitude", "IPLatitude" } );
auto worldMapCanvas = new TCanvas();
worldMap->SetTitle("ROOT Downloads per Location (GitHub exluded);Longitude;Latitude");
August 2018
Alexandra-Maria Dobrescu

Definition in file df028_SQliteIPLocation.C.