#!/usr/bin/perl -w
# SlaveInit
# 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 strict;
use Pg;
use Getopt::Long;
use Sys::Hostname;

$| = 1;

my ($debug,$verbose,$quiet) = (0,0,0);
my ($help,$masterhost,$masterport,$masteruser,$masterpassword,
	$slavehost,$slaveport,$slaveuser,$slavepassword);

my $result = GetOptions(
	"debug!" => \$debug, "verbose!" => \$verbose,
	"quiet!" => \$quiet, "help" => \$help,
	"masterhost=s" => \$masterhost, "masterport=i" => \$masterport,
	"masteruser=s" => \$masteruser, "masterpassword=s" => \$masterpassword,
	"slavehost=s" => \$slavehost, "slaveport=i" => \$slaveport,
	"slaveuser=s" => \$slaveuser, "slavepassword=s" => \$slavepassword,
	);

if (defined($help) || (scalar(@ARGV) < 2)) {
    print "Usage: $0 [options] masterdb slavedb
Options:
	--masterhost=hostname --masterport=port
	--masteruser=username --masterpassword=string
	--slavehost=hostname --slaveport=port
	--slaveuser=username --slavepassword=string
";
    exit ((scalar(@ARGV) < 2)? 1:0);
}

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

my $sinfo = "dbname=$slave";
$sinfo = "$sinfo host=$slavehost" if (defined($slavehost));
$sinfo = "$sinfo port=$slaveport" if (defined($slaveport));
$sinfo = "$sinfo user=$slaveuser" if (defined($slaveuser));
$sinfo = "$sinfo password=$slavepassword" if (defined($slavepassword));

my $minfo = "dbname=$master";
$minfo = "$minfo host=$masterhost" if (defined($masterhost));
$minfo = "$minfo port=$masterport" if (defined($masterport));
$minfo = "$minfo user=$masteruser" if (defined($masteruser));
$minfo = "$minfo password=$masterpassword" if (defined($masterpassword));

sub RollbackAndQuit {
    my $conn = shift @_;

    print STDERR $conn->errorMessage;
    $conn->exec("ROLLBACK");
    exit (-1);
}

# First, lets add the needed information in the slave database

print("Connecting to $sinfo\n") if ($debug || $verbose);
my $conn = Pg::connectdb($sinfo);
if ($conn->status != PGRES_CONNECTION_OK) {
    print STDERR "Failed opening $sinfo\n";
    exit 1;
}

$result = $conn->exec("BEGIN");
RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);

$result = $conn->exec("set transaction isolation level serializable");
RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);

$result = $conn->exec("DROP TABLE _RSERV_SLAVE_TABLES_");
RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);

$result = $conn->exec("DROP TABLE _RSERV_SLAVE_SYNC_");
RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);

$result = $conn->exec("COMMIT");
RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);


# next, let's tell the master that the slave is gone.

print("Connecting to $minfo\n") if ($debug || $verbose);
$conn = Pg::connectdb($minfo);
if ($conn->status != PGRES_CONNECTION_OK) {
    print STDERR "Failed opening $minfo\n";
    exit 1;
}


my $host = defined($slavehost) ? $slavehost : hostname;

$result = $conn->exec("DELETE FROM _RSERV_SERVERS_ WHERE host='$host' AND dbase='$slave'");
if ($result->resultStatus ne PGRES_COMMAND_OK) {
    print STDERR $conn->errorMessage;
    exit (-1);
}


exit (0);
