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pt-table-sync-wrapper.pl
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pt-table-sync-wrapper.pl
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#!/usr/bin/perl
#Autor: Artur Neumann INF/N ict.projects@nepal.inf.org
#Version: see $version variable
#last change: 2013.12.2
#This script is written to syncronize the INF personnel database on different server
#Its written arround pt-table-sync: http://www.percona.com/doc/percona-toolkit
#and unison: http://www.cis.upenn.edu/~bcpierce/unison/
#This script can handle as much servers as you like and can eather sync one or two-way
#the server with this script running acts as hub and the other servers as spokes
#for two way sync of more than 2 server the hub sync all server the first time and then goes
#around a second time so the changes from the later sync servers also arrive on the earlier sync servers
#Conflicts (changes between two sync on different servers) will be recognized with the help of the "changelog" table
#In a conflict the later change wins but both parties gets an email with the information about the conflict.
#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
#To use this script please check the next lines and adjust them
#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
# PERL MODULE, make sure all modules are installed
use Data::Dumper;
use DBI;
use strict;
use warnings;
use IPC::Open3;
use POSIX qw/strftime/;
use POSIX qw/tmpnam/;
use MIME::Lite; # to intall on ubuntu run 'sudo apt-get install libmime-lite-perl'
use Symbol qw(gensym);
use IO::File;
use Storable qw(dclone);
use Authen::SASL; # to intall on ubuntu run 'sudo apt-get install libauthen-sasl-perl'
use MIME::Base64;
#Variables to configure
#------------------------------------------------------
my $version = "2.4.1";
my $ptTableSync = "/usr/bin/pt-table-sync"; #install from http://www.percona.com/doc/percona-toolkit/2.1/installation.html
my $syncCommandAdditionalAttributes = " --print --execute --conflict-comparison newest --verbose --conflict-error die --function MD5";
my $emailFromAddress = 'yourmail@company.org';
my $unison = "/usr/bin/unison"; #to install on ubunto run 'sudo apt-get install unison'
my $conflictEmailCCAddresses = 'yourmail@company.org'; #separate addresses by comma
my $administratorAddresses = 'yourmail@company.org'; #addresses the output of the script will be send
my $preExecutionSQLcommand = "UPDATE `site` SET `maintenance` = '1' WHERE `site_specific_id` =?;";
my $postExecutionSQLcommand = "UPDATE `site` SET `maintenance` = '0' WHERE `site_specific_id` =?;";
my $mysql_connect_timeout=5;
my $mysql_read_timeout=1;
#use this line send emails via sendmail
#MIME::Lite->send('sendmail');
#use this line to send emails direct via SMTP
#if you use this you also need to enable the two lines above:
#use Authen::SASL; and #use MIME::Base64;
MIME::Lite->send( 'smtp', "company.org", AuthUser => 'mail@company.org', AuthPass => 'xxxx' );
#list of servers in the network
my %servers = (
1 => { #this number must be the same id as in the auto_increment_offset variable in the my.cnf config file
#AND the site_specific_id in the site table
#this must be the server this script runs on, its the main one
host => "localhost",
database => "dbname",
username => "db-sync-user",
password => "db-syncpasword",
type => "master", #the first server must be a master, it writes data to other servers
pathOfFilesToSync => "/var/www/fileUploads/" #absolute path of the files that have to be synced.
},
2 => {
host => "192.168.56.102",
database => "dbname",
username => "db-sync-user",
password => "db-syncpasword",
type => "master", #can be "master" OR "slave"
#a master server will write his data to all other servers
#so between master servers datachanges will be sync bidirectional
#a slave server is not allowed to write data to other servers,
#a slave server will just receive data and all changes on a slave
#server will be overwritten at the next sync by data from the master server(s)
pathOfFilesToSync => "/var/www/fileUploads/" #absolute path of the files that have to be synced.
},
3 => {
host => "192.168.56.103",
database => "dbname",
username => "db-sync-user",
password => "db-syncpasword",
type => "master", #can be "master" OR "slave"
pathOfFilesToSync => "/var/www/fileUploads/" #absolute path of the files that have to be synced.
},
);
#list of tables you like to sync.
#every table needs a single-column primary key
#syntax: ["table-name" , "conflict-column-name"]
my @tableData = (
[ "country", "timestamp" ],
[ "leaving_reason", "timestamp" ],
[ "leave_type", "timestamp" ],
[ "grade", "timestamp" ],
[ "illness", "timestamp" ],
[ "programme", "timestamp" ],
[ "project", "timestamp" ],
[ "section", "timestamp" ],
[ "unit", "timestamp" ],
[ "post", "timestamp" ],
[ "address", "address_timestamp" ],
[ "email", "email_timestamp" ],
[ "phone", "phone_timestamp" ],
[ "name", "name_timestamp" ]
);
#do not change anything below this line or your computer will explode, the sun will fade, the universe colaps and the world we
#know will end. So be carefull, You have been warned!
#-------------------------------------------------------------------------------------
my @conflicts;
my @errors;
my %servers_to_retry;
my %dbh;
my $insertCount = 0;
my $updateCount = 0;
my $syncSummary = "Version: $version \nSync started at: " . strftime( '%d-%m-%Y %H:%M', localtime ) . "\n\n";
my $fileSyncSummary = "";
my $verboseOutput = $syncSummary;
my $errorOutput = "";
my $unisonLogFile = "";
my $errorString;
my $fields_hash;
my $server_id;
my $emailSubjectPostfix = "";
#This are MySQL and percona table sync error that just lead to a warning and a retry, all other errors will cause a abbort
my $warning_errors = ".*?((Lost connection to MySQL server)|(Can\'t connect to MySQL server)|(MySQL server has gone away)|(Issuing rollback)).*?";
my $sql;
my $sth;
my %DBattr = (
PrintError => 1,
RaiseError => 0,
);
#check if pt-table-sync and unison exists
if ( !-e $unison ) {
$fileSyncSummary =
"cannot find $unison, I will not sync the files.\n"
. "To sync files please install unison from http://www.cis.upenn.edu/~bcpierce/unison/ "
. "or adjust the \$unison variable in this script. "
. "Tipp: for Debian/Ubuntu simply run 'sudo apt-get install unison'\n\n";
errorMessage( 'warning', $fileSyncSummary );
}
if ( !-e $ptTableSync ) {
errorMessage(
'critical',
"cannot find $ptTableSync, please install the percona-toolkit from "
. "http://www.percona.com/software/percona-toolkit or "
. "adjust the \$ptTableSync variable in this script\n\n"
);
}
#
#connect to every server
#and check if the table and conflict-column exist
foreach $server_id (sort (keys %servers)) {
print "Connecting ... host: $servers{$server_id}{host} database:$servers{$server_id}{database} \n";
my $db = DBI->connect( 'DBI:mysql:' . $servers{$server_id}{database} . ';host=' . $servers{$server_id}{host}.';mysql_connect_timeout=5;mysql_read_timeout=1',
$servers{$server_id}{username},
$servers{$server_id}{password} );
$dbh{$server_id}=$db;
if ( defined $DBI::errstr ) {
$errorString = "\nCould not connect to database on server $servers{$server_id}{host}\n $DBI::errstr\n";
#if we have a problem with the first server (the main one and the one running this script), we cannot proceed
if ( $server_id == 1 ) {
errorMessage( 'critical', $errorString );
}
#if it not the main server, we just remove the server from the list and sync the rest
else {
errorMessage( 'warning', $errorString . "We will not sync this server and proceed with the next one (if any)\n\n" );
$servers{$server_id}{type} = "delete";
next;
}
}
print "Cheking database structure ... \n";
foreach my $table (@tableData) {
$sql = "show columns from `@$table[0]`";
$fields_hash = $dbh{$server_id}->selectall_hashref( $sql, "Field", \%DBattr );
#check if table exists
if ( defined $DBI::errstr ) {
$errorString = "\nDatabase Error on server $servers{$server_id}{host}\n $DBI::errstr\n";
#if we have a problem with the first server (the main one and the one running this script), we cannot proceed
if ( $server_id == 1 ) {
errorMessage( 'critical', $errorString );
}
#if it not the main server, we just remove the server from the list and sync the rest
else {
errorMessage( 'warning', $errorString . "We will not sync this server and proceed with the next one (if any)\n\n" );
$servers{$server_id}{type} = "delete";
last;
}
}
else {
#check if conflict-column exists and if it has the type "timestamp"
if ( $fields_hash->{ @$table[1] }{'Type'} ne 'timestamp' ) {
$errorString =
"The column "
. `@$table[1]`
. " does not exist in the table "
. `@$table[0]`
. " on the server "
. $servers{$server_id}{host}
. " or its not of type 'timestamp' - please doublecheck the \@tableData list and the database on the server\n"
. "We will not sync this server and proceed with the next one (if any)\n\n";
errorMessage( 'warning', $errorString );
$servers{$server_id}{type} = "delete";
last;
}
}
}
}
#run preexecution command on the hub
print "run preexecution command on server " . $servers{1}{host} . "\n";
$dbh{1}->do( $preExecutionSQLcommand, undef, 1 );
if ( defined $DBI::errstr ) {
errorMessage( 'critical', " could not run preexecution command on " . $servers{1}{host} . "\n$DBI::errstr\n" );
}
#delete Servers with type==delete
deleteMarkedServers();
my $command;
my $count_master_servers = 0;
my $unisonLogFileFh;
#create a temp file as unison log file
do { $unisonLogFile = tmpnam() } until $unisonLogFileFh = IO::File->new( $unisonLogFile, O_RDWR | O_CREAT | O_EXCL );
# install atexit-style handler so that when we exit or die,
# we automatically delete this temporary file
END {
if ( -e $unisonLogFile ) {
unlink($unisonLogFile) or die "Couldn't delete unison log file: $unisonLogFile : $!";
}
}
#syncing all the servers the first time
foreach $server_id (sort (keys %servers)) {
if ( $server_id != 1 ) {
syncServer( "first", $server_id );
if (!exists $servers_to_retry{$server_id}) {
#make a time stamp on the hub
stampServer( 1, $server_id );
#stamp every server with a stamp from a server it has already data from
for ( my $i = 1 ; $i < $server_id ; $i++ ) {
if (!exists $servers_to_retry{$i} and exists $servers{$i}) {
stampServer( $server_id, $i );
}
}
}
}
}
#retry syncing failed servers
my $print_string= "\nServers to retry:" . %servers_to_retry . "\n";
print $print_string;
$verboseOutput = $verboseOutput . $print_string;
foreach my $server_id (keys %servers_to_retry){
syncServer( "firstretry", $server_id );
if ($servers{$server_id}{type} ne 'delete') {
#make a time stamp on the hub
stampServer( 1, $server_id );
#stamp every server with a stamp from a server it has already data from
for ( my $i = 1 ; $i < $server_id ; $i++ ) {
if (!exists $servers_to_retry{$i} and exists $servers{$i}) {
stampServer( $server_id, $i );
}
}
}
}
#delete all servers that could not be synced even after a retry
deleteMarkedServers();
#count the remaining master servers
$count_master_servers = scalar (grep { $servers{$_}{type} eq 'master' } (keys %servers));
#if we have more than 2 masters we need to sync again
#but also if there are just two masters and there are slaves between servers[0] and the second master
#these slaves have to be sync again to get the data from the second master
#there is also no need to sync again in there were no changes made at all
if (( $count_master_servers > 2 || ( $count_master_servers == 2 && $servers{2}{type} ne "master" ))
&& ($insertCount > 0 || $updateCount > 0) ) {
%servers_to_retry=();
#sync every server (exept the last one) again to distribute the changes from the later servers to the earlier ones
foreach $server_id (sort (keys %servers)) {
if ( $server_id != 1 ) {
syncServer( "second", $server_id );
if (!exists $servers_to_retry{$server_id})
{
#stamp every server with a stamp of the server it now got the data from
#(sort (keys %servers))[-1] gets the highest key (id) in the hash
for ( my $i = (sort (keys %servers))[-1] ; $i > $server_id ; $i-- ) {
if (exists $servers{$i}) {
stampServer( $server_id, $i );
}
}
}
}
}
#retry syncing failed servers
$print_string= "\nServers to retry:" . %servers_to_retry . "\n";
print $print_string;
$verboseOutput = $verboseOutput . $print_string;
#retry the failed ones
foreach my $server_id (keys %servers_to_retry){
syncServer( "secondretry", $server_id );
if ($servers{$server_id}{type} ne 'delete')
{
#stamp every server with a stamp of the server it now got the data from
for ( my $i = (sort (keys %servers))[-1] ; $i > $server_id ; $i-- ) {
if (exists $servers{$i}) {
stampServer( $server_id, $i );
}
}
}
}
#delete all servers that could not be synced even after a retry
deleteMarkedServers();
} else {
#if there were no need for a second sync we know that every server has all information, so we can stamp all rest servers
foreach $server_id (sort (keys %servers)) {
if ( $server_id != 1 ) {
#stamp every server with a stamp of the server it now got the data from
for ( my $i = (sort (keys %servers))[-1] ; $i > $server_id ; $i-- ) {
if (exists $servers{$i}) {
stampServer( $server_id, $i );
}
}
}
}
}
#sending emails to loosers and winners
print "sending emails ...\n";
foreach my $conflict (@conflicts) {
my $loosing_party_text = '';
my $loosing_party_addresses = '';
for ( my $i = 0 ; $i < @{ $conflict->{'loosing_parties'} } ; $i++ ) {
$loosing_party_text =
$loosing_party_text
. "==========="
. ( $i + 1 )
. "===========\n"
. $conflict->{'loosing_parties'}[$i]{'comment'}
. " - timestamp: "
. $conflict->{'loosing_parties'}[$i]{'timestamp'} . "\n"
. "made by "
. $conflict->{'loosing_parties'}[$i]{'person'}{'full_name'} . " - "
. "email: "
. $conflict->{'loosing_parties'}[$i]{'person'}{'email'}
. " username: "
. $conflict->{'loosing_parties'}[$i]{'person'}{'user_name'}
. " working on server: " . "\""
. $conflict->{'loosing_parties'}[$i]{'server'}{'host'}
. "\"\n\n";
$loosing_party_addresses = $loosing_party_addresses . ',' . $conflict->{'loosing_parties'}[$i]{'person'}{'email'}
}
my $msg = MIME::Lite->new(
From => $emailFromAddress,
To => $conflict->{'winning_party'}{'person'}{'email'} . $loosing_party_addresses,
Cc => $conflictEmailCCAddresses,
Subject => 'Conflict during sync of INF personnel database!',
Data => "There was an error during the synchronization of the INF personnel database.\n"
. "Several person modified the same record in the table "
. "\"$conflict->{'table'}\""
. " on different servers.\n"
. "To solve the conflict we kept the change of "
. $conflict->{'winning_party'}{'person'}{'full_name'} . " - "
. "email: "
. $conflict->{'winning_party'}{'person'}{'email'}
. " username: "
. $conflict->{'winning_party'}{'person'}{'user_name'}
. " working on server: " . "\""
. $conflict->{'winning_party'}{'server'}{'host'} . "\"\n"
. "details of the winning data:\n"
. $conflict->{'winning_party'}{'comment'}
. " - timestamp:"
. $conflict->{'winning_party'}{'timestamp'} . "\n\n"
. "there were "
. @{ $conflict->{'loosing_parties'} }
. " changes overwritten on other servers: \n"
. $loosing_party_text
. "Please contact the persons involved in this conflict and "
. "check which data is most actual / accurate!"
);
$msg->send;
}
$Data::Dumper::Terse = 0;
$Data::Dumper::Indent = 3;
$Data::Dumper::Sortkeys = 1;
$Data::Dumper::Varname = "conflict";
$verboseOutput = Dumper(@conflicts) . "\n---------------------------------------\n\n" . $verboseOutput;
printErrorsAndSummary();
sendAdministratorEmail();
sub deleteMarkedServers {
#delete all the servers with problems from the list
foreach $server_id (sort (keys %servers)) {
if ( $servers{$server_id}{type} eq "delete" ) {
delete ($servers{$server_id});
delete ($dbh{$server_id});
}
}
}
sub checkForConflicts {
my $server_to_change->{'host'} = $_[0];
my $record_id = $_[1];
my $table_name = $_[2];
my $just_synced_server_id = $_[3];
my $server_id_with_most_recent_change;
my $server_id_to_check_for_conflict;
my $time_of_oldest_log->{'this_time'} = '0000-00-00';
my $change_log;
my $sync_log;
my $changelog_sql;
my $print_string= "Check for conflicts. record_id=$record_id Table: $table_name\n";
print $print_string;
$verboseOutput = $verboseOutput . "\n". $print_string;
#before the UPDATE statement the pt-sync-table tools shows us the server that was updated
#so the other one is the one with the most recent changes
#As we always sync from $server[0], the server with the most recent data must be either $server[0] or
#the one we are syncing just now.
if ( $server_to_change->{'host'} eq $servers{1}{host} ) {
$server_id_with_most_recent_change = $just_synced_server_id;
}
else {
$server_id_with_most_recent_change = 1;
}
#TODO can we combine that with the IF statement before?
foreach my $server_id_loop (sort (keys %servers)) {
if ( $server_to_change->{'host'} eq $servers{$server_id_loop}{host} ) {
$server_to_change->{'id'} = $server_id_loop;
print "found server_to_change ID " . $server_to_change->{'id'} . "\n";
last;
}
}
my %conflict;
#first check the updated host if there were any conflicts after the last sync
#a conflict is when there was an update on the same record since the last sync
#we just need to check master-servers, because slaves will be overwritten anyway
if ($servers{$server_to_change->{'id'}}{type} eq "master" )
{
#The UNION in the Subquery makes sure there is a date even if the server was never synced before
$changelog_sql =
"SELECT `change_log`.`timestamp` ,
`change_log`.comment,
`users`.`email`,
`users`.`name`,
`users`.`lastname`,
`users`.`user_name`
FROM `change_log`
JOIN `users` ON `change_log`.`user_id` = `users`.`id`
WHERE `table` = '$table_name'
AND `record_id` = '$record_id'
AND `change_log`.`timestamp` >
(
SELECT this_time FROM `sync` WHERE sync_from = ?
UNION SELECT '0000-00-00'
ORDER BY this_time DESC LIMIT 1
)
ORDER BY `change_log`.`timestamp` DESC
LIMIT 1";
my %loosing_party;
#see if we have a entry in the change_log
my $db = connectToMySQLServer ($server_to_change->{'id'});
if (!$db) {
errorMessage( 'warning', "could not check for conflicts on " . $server_to_change->{'host'} . "\n" );
} else {
$change_log = $db->selectrow_hashref( $changelog_sql, undef, $server_id_with_most_recent_change );
if ( defined $DBI::errstr ) {
if ($DBI::errstr =~ $warning_errors ) {
errorMessage( 'warning', "could not check for conflicts on " . $server_to_change->{'host'} . "\n$DBI::errstr\n" );
}
#anything else will lead to an abbort
else {
errorMessage( 'critical', "could not check for conflicts on " . $server_to_change->{'host'} . "\n$DBI::errstr\n" );
}
}
$db->disconnect;
}
if ( defined $change_log ) {
print "Found Conflict (changelog) ".$change_log->{'timestamp'} . "\n";
#now we discovered a real conflict (the same row in the same table is changed on least two servers between
#the last sync and now)
#we found a loosing party
#for cheking who is winner and who is looser we trust pt-table-sync and NOT the timestamps in the
#change_log table
#pt-table-sync tould us already that it updated one of the servers, so we know for sure this one
#is a looser.
if ( not defined $change_log->{'name'} ) {
$change_log->{'name'} = '';
}
if ( not defined $change_log->{'lastname'} ) {
$change_log->{'lastname'} = '';
}
$loosing_party{'comment'} = $change_log->{'comment'};
$loosing_party{'person'}{'email'} = $change_log->{'email'};
$loosing_party{'person'}{'full_name'} = $change_log->{'name'} . " " . $change_log->{'lastname'};
$loosing_party{'person'}{'user_name'} = $change_log->{'user_name'};
$loosing_party{'timestamp'} = $change_log->{'timestamp'};
$loosing_party{'server'}{'host'} = $server_to_change->{'host'};
$loosing_party{'server'}{'id'} = $server_to_change->{'id'};
push( @{ $conflict{'loosing_parties'} }, {%loosing_party} );
#get the data of the winning party
my $db = connectToMySQLServer ($server_id_with_most_recent_change);
if (!$db) {
errorMessage( 'warning', "could not get winning party informations from " . $servers{$server_id_with_most_recent_change}{host} . "\n" );
} else {
$change_log = $db->selectrow_hashref( $changelog_sql, undef, $server_to_change->{'id'} );
if ( defined $DBI::errstr ) {
if ($DBI::errstr =~ $warning_errors ) {
errorMessage( 'warning', "could not get winning party informations from " . $servers{$server_id_with_most_recent_change}{host} . "\n" );
}
#anything else will lead to an abbort
else {
errorMessage( 'critical', "could not get winning party informations from " . $servers{$server_id_with_most_recent_change}{host} . "\n$DBI::errstr\n" );
}
}
$db->disconnect;
}
#If that is not set then we cannot find the winning party yet, will will find it later by checking the synclog
if ( defined $change_log ) {
$conflict{'winning_party'}{'comment'} = $change_log->{'comment'};
$conflict{'winning_party'}{'person'}{'email'} = $change_log->{'email'};
$conflict{'winning_party'}{'person'}{'full_name'} = $change_log->{'name'} . " " . $change_log->{'lastname'};
$conflict{'winning_party'}{'person'}{'user_name'} = $change_log->{'user_name'};
$conflict{'winning_party'}{'timestamp'} = $change_log->{'timestamp'};
$conflict{'winning_party'}{'server'}{'host'} = $servers{$server_id_with_most_recent_change}{host};
$conflict{'winning_party'}{'server'}{'id'} = $server_id_with_most_recent_change;
}
}
}
#check for conflicts in the past sync log
#print "Checking for conflicts on other servers\n";
foreach $server_id_to_check_for_conflict (sort (keys %servers)) {
#we just need to check master-servers, because slaves will be overwritten anyway
#and the server that has the most recent change don't need to be checked
if ( $server_id_to_check_for_conflict != $server_id_with_most_recent_change
&& $server_id_to_check_for_conflict != $server_to_change->{'id'}
&& $servers{$server_id_to_check_for_conflict}{type} eq "master" )
{
print "checking for conflicts sync_log : " . $server_id_to_check_for_conflict . "\n";
print " server_id_with_most_recent_change " . $server_id_with_most_recent_change . "\n";
print " server_to_change->{'id'} " . $server_to_change->{'id'} . "\n";
#The UNION in the Subquery makes sure there is a date even if the server was never synced before
$sql = "SELECT `comment`,
`timestamp`,
`user_name`,
`user_email`,
`user_firstname`,
`user_lastname`,
`time_of_change_on_remote_server`
FROM `sync_log`
WHERE `table` = ?
AND `record_id` = ?
AND `site_id_from` = ?
AND `site_id_to` = 1
AND `time_of_change_on_remote_server` >
(
SELECT this_time FROM `sync` WHERE sync_from = ?
AND sync_to = ?
UNION SELECT '0000-00-00'
ORDER BY this_time DESC LIMIT 1
)
ORDER BY `timestamp` DESC
LIMIT 1";
my %loosing_party;
#print $sql ."\n";
#print $table_name . " " .
# $record_id. " " .
# $server_id_to_check_for_conflict . " " .
#
# $server_id_with_most_recent_change. " " .
# $server_id_to_check_for_conflict . "\n";
#
$sync_log = $dbh{1}->selectrow_hashref( $sql, undef,
$table_name,
$record_id,
$server_id_to_check_for_conflict ,
$just_synced_server_id,
$server_id_to_check_for_conflict);
if ( defined $DBI::errstr ) {
errorMessage( 'critical', "could not check for conflicts for " . $servers{$server_id_to_check_for_conflict}{host} . "\n$DBI::errstr\n" );
}
if ( defined $sync_log ) {
print "Found Conflict (synclog) ".$sync_log->{'timestamp'} . "\n";
if ( not defined $sync_log->{'name'} ) {
$sync_log->{'name'} = '';
}
if ( not defined $sync_log->{'lastname'} ) {
$sync_log->{'lastname'} = '';
}
#if we overwrite the HUB, the server we just checked must be a looser otherwise the winner
if ($server_to_change->{'id'} == 1) {
$loosing_party{'comment'} = $sync_log->{'comment'};
$loosing_party{'person'}{'email'} = $sync_log->{'user_email'};
$loosing_party{'person'}{'full_name'} = $sync_log->{'user_firstname'} . " " . $sync_log->{'user_lastname'};
$loosing_party{'person'}{'user_name'} = $sync_log->{'user_name'};
$loosing_party{'timestamp'} = $sync_log->{'time_of_change_on_remote_server'};
$loosing_party{'server'}{'host'} = $servers{$server_id_to_check_for_conflict}{host};
$loosing_party{'server'}{'id'} = $server_id_to_check_for_conflict;
push( @{ $conflict{'loosing_parties'} }, {%loosing_party} );
#get the data of the winning party
my $db = connectToMySQLServer ($server_id_with_most_recent_change);
if (!$db) {
errorMessage( 'warning', "could not get winning party informations from " . $servers{$server_id_with_most_recent_change}{host} . "\n" );
} else {
$change_log = $db->selectrow_hashref( $changelog_sql, undef, $server_to_change->{'id'} );
if ( defined $DBI::errstr ) {
if ($DBI::errstr =~ $warning_errors ) {
errorMessage( 'warning', "could not get winning party informations from " . $servers{$server_id_with_most_recent_change}{host} . "\n" );
}
#anything else will lead to an abbort
else {
errorMessage( 'critical', "could not get winning party informations from " . $servers{$server_id_with_most_recent_change}{host} . "\n$DBI::errstr\n" );
}
}
$db->disconnect;
}
$conflict{'winning_party'}{'comment'} = $change_log->{'comment'};
$conflict{'winning_party'}{'person'}{'email'} = $change_log->{'email'};
$conflict{'winning_party'}{'person'}{'full_name'} = $change_log->{'name'} . " " . $change_log->{'lastname'};
$conflict{'winning_party'}{'person'}{'user_name'} = $change_log->{'user_name'};
$conflict{'winning_party'}{'timestamp'} = $change_log->{'timestamp'};
$conflict{'winning_party'}{'server'}{'host'} = $servers{$server_id_with_most_recent_change}{host};
$conflict{'winning_party'}{'server'}{'id'} = $server_id_with_most_recent_change;
}
else {
$conflict{'winning_party'}{'comment'} = $sync_log->{'comment'};
$conflict{'winning_party'}{'person'}{'email'} = $sync_log->{'user_email'};
$conflict{'winning_party'}{'timestamp'} = $sync_log->{'time_of_change_on_remote_server'};
$conflict{'winning_party'}{'person'}{'full_name'} = $sync_log->{'user_firstname'} . " " . $sync_log->{'user_lastname'};
$conflict{'winning_party'}{'person'}{'user_name'} = $sync_log->{'user_name'};
$conflict{'winning_party'}{'server'}{'host'} = $servers{$server_id_to_check_for_conflict}{host};
$conflict{'winning_party'}{'server'}{'id'} = $server_id_to_check_for_conflict;
}
}
}
}
#print Dumper($conflict{'loosing_parties'});
if ( defined $conflict{'loosing_parties'} && @{ $conflict{'loosing_parties'} } ) {
#check if there is a conflict with this table and record_id
#if yes we will have to see who is the real winner
my $conflicts_exists = 0;
my $conflict_num = 0;
foreach my $conflict_loop (@conflicts) {
if ( $conflict_loop->{'table'} eq $table_name
&& $conflict_loop->{'record_id'} eq $record_id)
{
$conflicts[$conflict_num]{'winning_party'}=$conflict{'winning_party'};
#collect all loosing parties
for ( my $i = 0 ; $i < @{ $conflict_loop->{'loosing_parties'} } ; $i++ ) {
if (!grep {
$_->{server}{id} == $conflict_loop->{'loosing_parties'}[$i]{server}{id}
} @{ $conflict{'loosing_parties'} })
{
push( @{ $conflict{'loosing_parties'} }, $conflict_loop->{'loosing_parties'}[$i] );
}
}
$conflicts[$conflict_num]{'loosing_parties'}=$conflict{'loosing_parties'};
$conflicts_exists=1;
last;
}
$conflict_num++;
}
if ($conflicts_exists == 0) {
$conflict{'table'} = $table_name;
$conflict{'record_id'} = $record_id;
#print "pushing conflict to conflicts";
push @conflicts, {%conflict};
}
}
}
sub syncServer {
my $runIdentifier = $_[0]; #can be: "first,second,firstretry,secondretry"
my $server_id = $_[1];
my $stopSyncingThisServer = 0; #will be set to 1 in case of a "retry" error
my $print_string;
my $server_id_to_check_for_conflict;
#running the preexecution command on the server
print "run preexecution command on server " . $servers{$server_id}{host} . "\n";
my $db = connectToMySQLServer ($server_id);
if (!$db) {
if ($runIdentifier eq 'firstretry' or $runIdentifier eq 'secondretry') {
errorMessage( 'warning', "could not run preexecution command on " . $servers{$server_id}{host} . "\nWe will not sync the server " .$servers{$server_id}{host} . " and proceed with the next one (if any)\n\n" );
$servers{$server_id}{type} = "delete";
} else {
errorMessage( 'retry', "could not run preexecution command on " . $servers{$server_id}{host} . "\n", $server_id );
}
$stopSyncingThisServer = 1;
} else {
$db->do( $postExecutionSQLcommand, undef, $server_id );
if ( defined $DBI::errstr ) {
if ($runIdentifier eq 'firstretry' or $runIdentifier eq 'secondretry') {
errorMessage( 'warning', "could not run preexecution command on " . $servers{$server_id}{host} . "\n$DBI::errstr\nWe will not sync the server " .$servers{$server_id}{host} . " and proceed with the next one (if any)\n\n" );
$servers{$server_id}{type} = "delete";
} else {
errorMessage( 'retry', "could not run preexecution command on " . $servers{$server_id}{host} . "\n$DBI::errstr\n", $server_id );
}
$stopSyncingThisServer = 1;
}
$db->disconnect;
}
foreach my $table (@tableData) {
#don't try to sync the other tables of this server or if there was a problem before don't even start
if ($stopSyncingThisServer == 1) {
last;
}
$command = "$ptTableSync ";
#for the second run we don't need bidirectional syncinng as we just destributing the canges from the later sync servers.
if ( $servers{$server_id}{type} eq 'master' and ($runIdentifier eq "first" or $runIdentifier eq "firstretry")) {
$command = $command . " --bidirectional ";
}
$command =
$command
. "h=$servers{1}{host},D=$servers{1}{database},t=@$table[0],u=$servers{1}{username},p=$servers{1}{password} "
. "h=$servers{$server_id}{host},D=$servers{$server_id}{database},u=$servers{1}{username},p=$servers{$server_id}{password} "
. " --conflict-column @$table[1] --ignore-columns @$table[1] $syncCommandAdditionalAttributes";
if ( $runIdentifier eq 'firstretry' or $runIdentifier eq 'secondretry' ) {
print "retry ";
$verboseOutput = $verboseOutput . "retry ";
}
print "syncing ";
$verboseOutput = $verboseOutput . "syncing ";
if ( $runIdentifier eq 'second' or $runIdentifier eq 'secondretry' ) {
print "second time ";
$verboseOutput = $verboseOutput . "second time ";
}
$print_string = " server: $servers{$server_id}{host} - table : '@$table[0]' - conflict column: '@$table[1]'\n";
print $print_string;
$verboseOutput = $verboseOutput . $print_string;
#stuff for catching STDERR and STDOUT see: http://learn.perl.org/faq/perlfaq8.html#How-can-I-capture-STDERR-from-an-external-command-
#the output contains the count of INSERT / UPDATES and the complete SQL statement
#we run throw all the output lines and see if we find an UPDATE, if yes we have to check if this item was also changed on an other serve
local *CATCHERR = IO::File->new_tmpfile;
my $pid = open3( gensym, \*CATCHOUT, ">&CATCHERR", $command );
while (<CATCHOUT>) {
$verboseOutput = $verboseOutput . "$_";
#count the inserts and updatess
if ( $_ =~ /(\d+)\s+(\d+)\s+(\d+)\s+(\d+)/ ) {
if ( $1 > 0 or $2 > 0 ) {
$errorString =
"There should not be any REPLACE or DELETE statements whily syncing. "
. "Please make sure the databasese are 100% identical before the first sync. \n"
. "See also the last SQL statement in the verbose information file \n";
errorMessage( 'critical', $errorString );
}
}
#found a UPDATE statment!
my $sql_statement = $_;
my $first_server_id = 1;
if ($sql_statement =~ /\/\*(.*)\*\/ UPDATE `($servers{$first_server_id}{database}|$servers{$server_id}{database})`.`@$table[0]`.*WHERE `id`=\'(\d+)\' LIMIT 1\;/ )
{
$updateCount = $updateCount + 1;
#before the UPDATE statement the pt-sync-table tools shows us the server that was updated this is $1
my $server_to_change = $1;
my $record_id = $3;
wrileSyncLog('UPDATE',$server_id,$server_to_change,@$table[0],$record_id,$sql_statement);
#in the first round of syncing we have to check for conflicts. But we don't need the conflict checks in the second
#round of syncing, because all conflict information should be there after the first round.
if ($runIdentifier eq "first" or $runIdentifier eq "firstretry")
{
#TODO erklären was hier passiert
$server_id_to_check_for_conflict = grep { $servers{$_}{host} eq $server_to_change } keys %servers;
#we just need to check for conflicts if the server we just updated was a master server
#slaves will be overwritten anyway
if ( $servers{$server_id_to_check_for_conflict}{type} eq 'master' ) {
#TODO we could use $server_id_to_check_for_conflict and replace $server_to_change here
checkForConflicts( $server_to_change, $record_id, @$table[0], $server_id );
}
}
}
#this case hapends for the one way syncs
elsif ($sql_statement =~ /UPDATE `($servers{$first_server_id}{database}|$servers{$server_id}{database})`.`@$table[0]`.*WHERE `id`=\'(\d+)\' LIMIT 1\s+\/\*percona-toolkit src_db:($servers{$first_server_id}{database}|$servers{$server_id}{database}) src_tbl:@$table[0] src_dsn:D=($servers{$first_server_id}{database}|$servers{$server_id}{database}),h=(.*),p=...,t=@$table[0],.* dst_db:($servers{$first_server_id}{database}|$servers{$server_id}{database}) dst_tbl:@$table[0] dst_dsn:D=.*,h=(.*),p=.*/) {
$updateCount = $updateCount + 1;
my $server_to_change = $7;
my $record_id = $2;
wrileSyncLog('UPDATE',$server_id,$server_to_change,@$table[0],$record_id,$sql_statement);
}
elsif ($sql_statement =~ /\/\*(.*)\*\/ INSERT INTO `($servers{$first_server_id}{database}|$servers{$server_id}{database})`.`@$table[0]`.* VALUES \('(\d+)',.*\)\;/) {
$insertCount = $insertCount + 1;
#before the INSERT statement the pt-sync-table tools shows us the server that was updated this is $1
my $server_to_change = $1;
my $record_id = $3;
wrileSyncLog('INSERT',$server_id,$server_to_change,@$table[0],$record_id,$sql_statement);
}
elsif ($sql_statement =~ /INSERT INTO `($servers{$first_server_id}{database}|$servers{$server_id}{database})`.`@$table[0]`.* VALUES \('(\d+)',.*\)\s+\/\*percona-toolkit src_db:($servers{$first_server_id}{database}|$servers{$server_id}{database}) src_tbl:@$table[0] src_dsn:D=($servers{$first_server_id}{database}|$servers{$server_id}{database}),h=(.*),p=...,t=@$table[0],.* dst_db:($servers{$first_server_id}{database}|$servers{$server_id}{database}) dst_tbl:@$table[0] dst_dsn:D=.*,h=(.*),p=.*/) {
$insertCount = $insertCount + 1;
my $server_to_change = $7;
my $record_id = $2;
wrileSyncLog('INSERT',$server_id,$server_to_change,@$table[0],$record_id,$sql_statement);
}
}
waitpid( $pid, 0 );
seek CATCHERR, 0, 0;
#if there was an error during the sync check the severity
while (<CATCHERR>) {
#when this errors occure we will try it again
if ($_ =~ $warning_errors ) {
$stopSyncingThisServer=1;
#if its already the retry run then mark the server as to be deleted and give a warning
if ($runIdentifier eq 'firstretry' or $runIdentifier eq 'secondretry') {
errorMessage( 'warning', $_ . "\nWe will not sync the server " .$servers{$server_id}{host} . " and proceed with the next one (if any)\n\n" );
$servers{$server_id}{type} = "delete";
}
#if the error comes the first time we will retry to sync the server later
else {