Annotation of /bin/Replicate

#!/usr/bin/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 "/usr/share/postgresql/contrib";

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

$| = 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";
$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";

$masterhost = $opt_masterhost || hostname;
$slavehost = $opt_slavehost || hostname;

# first, let's check if a instance is alrealy running

$str = $master.'@'.$masterhost.':'.$slave.'@'.$slavehost;
my $fname = "/tmp/.lock_rserv-$str";
if (-e $fname) {
    print STDERR "rServ is already running for $str. Remove $fname to override this.\n";
    exit(1);
}
open ARQ, ">$fname" || die "Cannot open $fname: $!\n";
print ARQ "$$\n";
close ARQ;

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);
if ($mconn->status != PGRES_CONNECTION_OK) {
    print STDERR "Failed opening $minfo\n";
    unlink $fname;
    exit 1;
}
my $sconn = Pg::connectdb($sinfo);
if ($sconn->status != PGRES_CONNECTION_OK) {
    print STDERR "Failed opening $sinfo\n";
    unlink $fname;
    exit 1;
}

my $slaveId = GetSlaveId($mconn, $slave, defined($opt_slavehost) ? $opt_slavehost : hostname);
if ($slaveId < 0) {
    unlink $fname;
    die "\n>>>>>>>>>>>>> ERROR\n";
}
SyncSync($mconn, $sconn);

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

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

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

unlink $fname;
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, $slaveId, $syncid);

        print "Succeeded\n" if (($res > 0) && ($verbose));
    }
}
1	dpavlin	1.2	#!/usr/bin/perl
2	dpavlin	1.1	# Replicate
3			# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
4
5			eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
6			& eval 'exec perl -S $0 $argv:q'
7			if 0;
8
9	dpavlin	1.2	use lib "/usr/share/postgresql/contrib";
10	dpavlin	1.1
11			use IO::File;
12			use Getopt::Long;
13			use RServ;
14	dpavlin	1.3	use Sys::Hostname;
15	dpavlin	1.1
16			$\| = 1;
17
18			$result = GetOptions("debug!", "verbose!", "help", "snapshot=s",
19			"masterhost=s", "slavehost=s", "host=s",
20			"masteruser=s", "slaveuser=s", "user=s",
21			"masterpassword=s", "slavepassword=s", "password=s");
22
23			my $debug = $opt_debug \|\| 0;
24			my $verbose = $opt_verbose \|\| 0;
25	dpavlin	1.3	my $snapshot = $opt_snapshot \|\| ".__Snapshot";
26			$snapshot .= '.' . $$;
27	dpavlin	1.1
28			if (defined($opt_help) \|\| (scalar(@ARGV) < 2)) {
29			print "Usage: $0 --snapshot=file --host=name --user=name --password=string masterdb slavedb\n";
30			print "\t--masterhost=name --masteruser=name --masterpassword=string\n";
31			print "\t--slavehost=name --slaveuser=name --slavepassword=string\n";
32			exit ((scalar(@ARGV) < 2)? 1:0);
33			}
34
35			my $master = $ARGV[0] \|\| "master";
36			my $slave = $ARGV[1] \|\| "slave";
37	dpavlin	1.3
38			$masterhost = $opt_masterhost \|\| hostname;
39			$slavehost = $opt_slavehost \|\| hostname;
40
41			# first, let's check if a instance is alrealy running
42
43			$str = $master.'@'.$masterhost.':'.$slave.'@'.$slavehost;
44			my $fname = "/tmp/.lock_rserv-$str";
45			if (-e $fname) {
46			print STDERR "rServ is already running for $str. Remove $fname to override this.\n";
47			exit(1);
48			}
49			open ARQ, ">$fname" \|\| die "Cannot open $fname: $!\n";
50			print ARQ "$$\n";
51			close ARQ;
52	dpavlin	1.1
53			my $minfo = "dbname=$master";
54			$minfo = "$minfo host=$opt_masterhost" if (defined($opt_masterhost));
55			$minfo = "$minfo user=$opt_masteruser" if (defined($opt_masteruser));
56			$minfo = "$minfo password=$opt_masterpassword" if (defined($opt_masterpassword));
57			my $sinfo = "dbname=$slave";
58			$sinfo = "$sinfo host=$opt_slavehost" if (defined($opt_slavehost));
59			$sinfo = "$sinfo user=$opt_slaveuser" if (defined($opt_slaveuser));
60			$sinfo = "$sinfo password=$opt_slavepassword" if (defined($opt_slavepassword));
61
62			print "Master connection is $minfo\n" if ($debug);
63			print "Slave connection is $sinfo\n" if ($debug);
64
65			my $mconn = Pg::connectdb($minfo);
66	dpavlin	1.3	if ($mconn->status != PGRES_CONNECTION_OK) {
67			print STDERR "Failed opening $minfo\n";
68			unlink $fname;
69			exit 1;
70			}
71	dpavlin	1.1	my $sconn = Pg::connectdb($sinfo);
72	dpavlin	1.3	if ($sconn->status != PGRES_CONNECTION_OK) {
73			print STDERR "Failed opening $sinfo\n";
74			unlink $fname;
75			exit 1;
76			}
77	dpavlin	1.1
78	dpavlin	1.3	my $slaveId = GetSlaveId($mconn, $slave, defined($opt_slavehost) ? $opt_slavehost : hostname);
79			if ($slaveId < 0) {
80			unlink $fname;
81			die "\n>>>>>>>>>>>>> ERROR\n";
82			}
83	dpavlin	1.1	SyncSync($mconn, $sconn);
84
85			my $outf = new IO::File;
86			open $outf, ">$snapshot";
87			print "\n>>>>>>>>>>>>> Prepare Snapshot\n\n" if ($verbose);
88	dpavlin	1.3	$res = PrepareSnapshot($mconn, $sconn, $outf, $slaveId);
89	dpavlin	1.1	close $outf;
90	dpavlin	1.3	if ($res < 0) {
91			unlink $fname;
92			die "\n>>>>>>>>>>>>> ERROR\n";
93			}
94	dpavlin	1.1	if ($res == 0)
95			{
96	dpavlin	1.3	print "\n>>>>>>>>>>>>> DBases are sync-ed\n" if ($verbose);
97			unlink $snapshot unless ($debug);
98			unlink $fname;
99			exit(0);
100	dpavlin	1.1	}
101
102			my $inpf = new IO::File;
103			open $inpf, "<$snapshot";
104			print "\n>>>>>>>>>>>>> Apply Snapshot\n\n" if ($verbose);
105			$res = ApplySnapshot($sconn, $inpf);
106			close $inpf;
107	dpavlin	1.3	if ($res < 0) {
108			unlink $fname;
109			die "\n>>>>>>>>>>>>> ERROR\n";
110			}
111	dpavlin	1.1
112			if ($res > 0)
113			{
114	dpavlin	1.3	print "Snapshot applied\n" if ($verbose);
115			unlink $snapshot unless ($debug);
116			SyncSync($mconn, $sconn);
117	dpavlin	1.1	}
118
119	dpavlin	1.3	unlink $fname;
120	dpavlin	1.1	exit(0);
121
122			###########################################################################
123
124			sub SyncSync
125			{
126			($mconn, $sconn) = @_;
127
128			print "\n>>>>>>>>>>>>> Sync SyncID\n\n" if ($verbose);
129			print "Get last SyncID from Slave DB\n" if ($verbose);
130			$syncid = GetSyncID($sconn);
131			if ($syncid > 0)
132			{
133			print "Last SyncID applied: $syncid\n" if ($verbose);
134			print "Sync SyncID\n" if ($verbose);
135
136	dpavlin	1.3	$res = SyncSyncID($mconn, $slaveId, $syncid);
137	dpavlin	1.1
138			print "Succeeded\n" if (($res > 0) && ($verbose));
139			}
140			}