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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.

The world map is held 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 excluded);Longitude;Latitude");
August 2018
Alexandra-Maria Dobrescu

Definition in file df028_SQliteIPLocation.C.

#define f(i)
Definition: RSha256.hxx:104
RDataFrame MakeSqliteDataFrame(std::string_view fileName, std::string_view query)
Factory method to create a SQlite RDataFrame.
Definition: RSqliteDS.cxx:538
static TFile * Open(const char *name, Option_t *option="", const char *ftitle="", Int_t compress=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault, Int_t netopt=0)
Create / open a file.
Definition: TFile.cxx:3998
The Canvas class.
Definition: TCanvas.h:23
2D Histogram with Polygonal Bins
Definition: TH2Poly.h:66