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package MasterServer::Database::dbCore;
use strict;
use warnings;
use Exporter 'import';
our @EXPORT = qw| database_login |;
################################################################################
## login to the database with credentials provided in the config file.
## returns dbh object or quits application on error.
##
## Recommended database types: Postgresql, MySQL or SQLite. Warranty void if
## other database types are used. Use at your own risk.
################################################################################
sub database_login {
my $self = shift;
# read db type from db login
my @db_type = split(':', $self->{dblogin}->[0]);
# if the type is an SQLite database, check if the database file exists
if ( "SQLite" =~ m/$db_type[1]/i) {
# check if database file exists
my $db_file = [split(':', $self->{dblogin}->[0])]->[2];
$db_file =~ s/dbname=//i;
unless (-e $db_file) {
# fatal error
$self->log("fatal", "Database file $db_file does not exist!");
# end program
$self->halt();
}
}
# inform what DB we try to load
# $self->log("info","Database: $db_type[1]");
# create the dbi object
my $dbh = DBI->connect(@{$self->{dblogin}}, {PrintError => $self->{db_print}});
# verify that the database connected
if (defined $dbh) {
# log the event
$self->log("info","Connected to the $db_type[1] database.");
# turn on error printing
$dbh->{printerror} = 1;
# if the type is an SQLite database, disable sync rw.
if ( "SQLite" =~ m/$db_type[1]/i) {
# synchronous read/writing to the SQLite file OFF. That means: when the script
# shuts down unexpectedly, i.e. because of power failure or a crash, changes
# to the database are NOT SAVED. However, if this setting is not turned OFF,
# it takes too long to write to the database, which means that new beacons,
# requests and servers cannot be processed. You don't have a choice, really..
$dbh->do("PRAGMA synchronous = OFF");
# allow the use of foreign keys (referencing)
$dbh->do("PRAGMA foreign_keys = ON");
}
# return the dbi object for further use
return $dbh;
}
else {
# fatal error
$self->log("fatal", "$DBI::errstr!");
# end program
$self->halt();
}
# in case of any other error, return undef.
return undef;
}
1;
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