postgresql/contrib/rserv/Replicate.in

# -*- perl -*-
# Replicate
# Vadim Mikheev, (c) 2000, PostgreSQL Inc.

eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
    & eval 'exec perl -S $0 $argv:q'
    if 0;

use lib "@LIBDIR@";

use IO::File;
use Getopt::Long;
use RServ;

$| = 1;

$result = GetOptions("debug!", "verbose!", "help", "snapshot=s",
		     "masterhost=s", "slavehost=s", "host=s",
		     "masteruser=s", "slaveuser=s", "user=s",
		     "masterpassword=s", "slavepassword=s", "password=s");

my $debug = $opt_debug || 0;
my $verbose = $opt_verbose || 0;
my $snapshot = $opt_snapshot || "__Snapshot";

if (defined($opt_help) || (scalar(@ARGV) < 2)) {
    print "Usage: $0 --snapshot=file --host=name --user=name --password=string masterdb slavedb\n";
    print "\t--masterhost=name --masteruser=name --masterpassword=string\n";
    print "\t--slavehost=name --slaveuser=name --slavepassword=string\n";
    exit ((scalar(@ARGV) < 2)? 1:0);
}

my $master = $ARGV[0] || "master";
my $slave = $ARGV[1] || "slave";
my $server = 0;

my $minfo = "dbname=$master";
$minfo = "$minfo host=$opt_masterhost" if (defined($opt_masterhost));
$minfo = "$minfo user=$opt_masteruser" if (defined($opt_masteruser));
$minfo = "$minfo password=$opt_masterpassword" if (defined($opt_masterpassword));
my $sinfo = "dbname=$slave";
$sinfo = "$sinfo host=$opt_slavehost" if (defined($opt_slavehost));
$sinfo = "$sinfo user=$opt_slaveuser" if (defined($opt_slaveuser));
$sinfo = "$sinfo password=$opt_slavepassword" if (defined($opt_slavepassword));

print "Master connection is $minfo\n" if ($debug);
print "Slave connection is $sinfo\n" if ($debug);

my $mconn = Pg::connectdb($minfo);
my $sconn = Pg::connectdb($sinfo);

$RServ::quiet = !$verbose;

SyncSync($mconn, $sconn);

my $outf = new IO::File;
open $outf, ">$snapshot";
print "\n>>>>>>>>>>>>> Prepare Snapshot\n\n" if ($verbose);
$res = PrepareSnapshot($mconn, $outf, $server);
close $outf;
die "\n>>>>>>>>>>>>> ERROR\n" if $res < 0;
if ($res == 0)
{
	print "\n>>>>>>>>>>>>> DBases are sync-ed\n" if ($verbose);
	exit(0);
}

my $inpf = new IO::File;
open $inpf, "<$snapshot";
print "\n>>>>>>>>>>>>> Apply Snapshot\n\n" if ($verbose);
$res = ApplySnapshot($sconn, $inpf);
close $inpf;
die "\n>>>>>>>>>>>>> ERROR\n" if $res < 0;

if ($res > 0)
{
	print "Snapshot applied\n" if ($verbose);
	unlink $snapshot unless ($debug);
	SyncSync($mconn, $sconn);
}

exit(0);

###########################################################################

sub SyncSync
{
    ($mconn, $sconn) = @_;

    print "\n>>>>>>>>>>>>> Sync SyncID\n\n" if ($verbose);
    print "Get last SyncID from Slave DB\n" if ($verbose);
    $syncid = GetSyncID($sconn);
    if ($syncid > 0)
    {
	print "Last SyncID applied: $syncid\n" if ($verbose);
	print "Sync SyncID\n" if ($verbose);

	$res = SyncSyncID($mconn, $server, $syncid);

	print "Succeeded\n" if (($res > 0) && ($verbose));
    }
}