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#!/usr/bin/env perl
#
# cleanup old partitions- perl script for mySQL partition rotation
#
# Copyright (C) 2016 Sebastian Damm (damm@sipgate.de)
#
# This file is part of webhomer, a free capture server.
#
# homer_mysql_remove_partitions.pl is free software; you can redistribute it
# and/or modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 3 of the License,
# or (at your option) any later version
#
# homer_mysql_remove_partitions.pl is distributed in the hope that it will be
# useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
use 5.010;
use strict;
use warnings;
use DBI;
use POSIX;
use Data::Dumper;
my $version = "1.0.0";
$| =1;
# Determine path and set default rotation.ini location
my $script_location = `dirname $0`;
$script_location =~ s/^\s+|\s+$//g;
my $default_ini = $script_location."/rotation.ini";
my $conf_file = $ARGV[0] // $default_ini;
our $CONFIG = read_config($conf_file);
my $db = db_connect($CONFIG, "db_data");
foreach my $table (keys %{ $CONFIG->{"DROP_OLD_PARTITIONS"} }) {
my $removeseconds = $CONFIG->{"DROP_OLD_PARTITIONS"}{$table};
say "Working on table $table, threshold $removeseconds." if($CONFIG->{"SYSTEM"}{"debug"} == 1);
# Skip if unconfigured
next if $removeseconds == 0;
# Reference Timestamp
my $mintstamp = time() - $removeseconds;
# Find the current table
my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) = gmtime();
my $tablesuffix = sprintf("%04d%02d%02d",($year+=1900),(++$mon),$mday);
my $todaytable = sprintf("%s_%s", $table, $tablesuffix);
if (is_table_partitioned($db, $CONFIG->{"MYSQL"}{"db_data"}, $todaytable)) {
# load all partitions of table
my %partitions = load_partitions($db, $CONFIG->{"MYSQL"}{"db_data"}, $todaytable);
say "Found Partitions: ".Dumper \%partitions if($CONFIG->{"SYSTEM"}{"debug"} == 1);
# check timestamp of partitions
my @partitions_to_remove;
foreach my $part (sort keys %partitions) {
say "Examining Partition $part" if($CONFIG->{"SYSTEM"}{"debug"} == 1);
if ($partitions{$part} < $mintstamp) {
say "Partition $part is older than minimum tstamp ($mintstamp)." if($CONFIG->{"SYSTEM"}{"debug"} == 1);
push(@partitions_to_remove,$part);
}
}
# delete old partitions
if(scalar @partitions_to_remove > 0) {
drop_partitions($db, $todaytable, @partitions_to_remove);
}
}
}
exit;
### END OF MAIN
sub drop_partitions {
my $db = shift;
my $table_name = shift;
my @parts2remove = @_;
my $query = "ALTER TABLE ".$table_name." DROP PARTITION ".join(',', @parts2remove);
say "DROP Partition: [$query]" if($CONFIG->{"SYSTEM"}{"debug"} == 1);
$db->do($query) or printf(STDERR "Failed to execute query [%s] with error: %s\n", ,$db->errstr) if($CONFIG->{"SYSTEM"}{"exec"} == 1);
if (!$db->{Executed}) {
say "Couldn't drop partitions: ".join(',', @parts2remove);
}
}
sub load_partitions {
my $db = shift;
my $db_name = shift;
my $table_name = shift;
my %partitions;
#Geting all partitions
my $query = "SELECT PARTITION_NAME, PARTITION_DESCRIPTION"
."\n FROM INFORMATION_SCHEMA.PARTITIONS WHERE TABLE_NAME='".$table_name."'"
."\n AND TABLE_SCHEMA='".$db_name."' ORDER BY PARTITION_DESCRIPTION ASC;";
my $sth = $db->prepare($query);
$sth->execute();
while(my @ref = $sth->fetchrow_array()) {
next if($ref[0] eq "pmax");
$partitions{$ref[0]} = $ref[1];
}
return %partitions;
}
sub is_table_partitioned {
my $db = shift;
my $db_name = shift;
my $table_name = shift;
my $query="SELECT create_options FROM information_schema.tables WHERE table_schema = '".$db_name."' and table_name = '".$table_name."'";
say "Debug: $query" if($CONFIG->{"SYSTEM"}{"debug"} == 1);
my $sth = $db->prepare($query);
$sth->execute();
if ($sth->rows == 0) {
say "Table $table_name does not exist. Skipping..." if($CONFIG->{"SYSTEM"}{"debug"} == 1);
return 0;
}
my ($tstatus) = $sth->fetchrow_array();
if ($tstatus !~ /partitioned/) {
say "Table $table_name is not partitioned. Skipping..." if($CONFIG->{"SYSTEM"}{"debug"} == 1);
return 0;
}
return 1;
}
sub read_config {
my $ini = shift;
open (INI, "$ini") || die "Can't open $ini: $!\n";
my $section;
my $CONFIG;
while (<INI>) {
chomp;
if (/^\s*\[(\w+)\].*/) {
$section = $1;
}
if ((/^(.*)=(.*)$/)) {
my ($keyword, $value) = split(/=/, $_, 2);
$keyword =~ s/^\s+|\s+$//g;
$value =~ s/(#.*)$//;
$value =~ s/^\s+//;
$value =~ s/\s+$//;
$CONFIG->{$section}{$keyword} = $value;
}
}
close(INI);
return $CONFIG;
}
sub db_connect {
my $CONFIG = shift;
my $db_name = shift;
my $db = DBI->connect("DBI:mysql:".$CONFIG->{"MYSQL"}{$db_name}.":".$CONFIG->{"MYSQL"}{"host"}.":".$CONFIG->{"MYSQL"}{"port"}, $CONFIG->{"MYSQL"}{"user"}, $CONFIG->{"MYSQL"}{"password"});
return $db;
}
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