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",
                     "masteruser=s", "slaveuser=s",
                     "masterpassword=s", "slavepassword=s",
                     "masterport=i", "slaveport=i"
                     );

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 masterdb slavedb\n";
    print "\t--masterhost=name --masterport=port\n";
    print "\t--masteruser=name --masterpassword=string\n";
    print "\t--slavehost=name --slaveport=port\n";
    print "\t--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));
$minfo = "$minfo port=$opt_masterport" if (defined($opt_masterport));
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));
$sinfo = "$sinfo port=$opt_slaveport" if (defined($opt_slaveport));

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	dpavlin	1.4	"masterhost=s", "slavehost=s",
20			"masteruser=s", "slaveuser=s",
21			"masterpassword=s", "slavepassword=s",
22			"masterport=i", "slaveport=i"
23			);
24	dpavlin	1.1
25			my $debug = $opt_debug \|\| 0;
26			my $verbose = $opt_verbose \|\| 0;
27	dpavlin	1.3	my $snapshot = $opt_snapshot \|\| ".__Snapshot";
28			$snapshot .= '.' . $$;
29	dpavlin	1.1
30			if (defined($opt_help) \|\| (scalar(@ARGV) < 2)) {
31	dpavlin	1.4	print "Usage: $0 --snapshot=file masterdb slavedb\n";
32			print "\t--masterhost=name --masterport=port\n";
33			print "\t--masteruser=name --masterpassword=string\n";
34			print "\t--slavehost=name --slaveport=port\n";
35			print "\t--slaveuser=name --slavepassword=string\n";
36	dpavlin	1.1	exit ((scalar(@ARGV) < 2)? 1:0);
37			}
38
39			my $master = $ARGV[0] \|\| "master";
40			my $slave = $ARGV[1] \|\| "slave";
41	dpavlin	1.3
42			$masterhost = $opt_masterhost \|\| hostname;
43			$slavehost = $opt_slavehost \|\| hostname;
44
45			# first, let's check if a instance is alrealy running
46
47			$str = $master.'@'.$masterhost.':'.$slave.'@'.$slavehost;
48			my $fname = "/tmp/.lock_rserv-$str";
49			if (-e $fname) {
50			print STDERR "rServ is already running for $str. Remove $fname to override this.\n";
51			exit(1);
52			}
53			open ARQ, ">$fname" \|\| die "Cannot open $fname: $!\n";
54			print ARQ "$$\n";
55			close ARQ;
56	dpavlin	1.1
57			my $minfo = "dbname=$master";
58			$minfo = "$minfo host=$opt_masterhost" if (defined($opt_masterhost));
59			$minfo = "$minfo user=$opt_masteruser" if (defined($opt_masteruser));
60			$minfo = "$minfo password=$opt_masterpassword" if (defined($opt_masterpassword));
61	dpavlin	1.4	$minfo = "$minfo port=$opt_masterport" if (defined($opt_masterport));
62	dpavlin	1.1	my $sinfo = "dbname=$slave";
63			$sinfo = "$sinfo host=$opt_slavehost" if (defined($opt_slavehost));
64			$sinfo = "$sinfo user=$opt_slaveuser" if (defined($opt_slaveuser));
65			$sinfo = "$sinfo password=$opt_slavepassword" if (defined($opt_slavepassword));
66	dpavlin	1.4	$sinfo = "$sinfo port=$opt_slaveport" if (defined($opt_slaveport));
67	dpavlin	1.1
68			print "Master connection is $minfo\n" if ($debug);
69			print "Slave connection is $sinfo\n" if ($debug);
70
71			my $mconn = Pg::connectdb($minfo);
72	dpavlin	1.3	if ($mconn->status != PGRES_CONNECTION_OK) {
73			print STDERR "Failed opening $minfo\n";
74			unlink $fname;
75			exit 1;
76			}
77	dpavlin	1.1	my $sconn = Pg::connectdb($sinfo);
78	dpavlin	1.3	if ($sconn->status != PGRES_CONNECTION_OK) {
79			print STDERR "Failed opening $sinfo\n";
80			unlink $fname;
81			exit 1;
82			}
83	dpavlin	1.1
84	dpavlin	1.3	my $slaveId = GetSlaveId($mconn, $slave, defined($opt_slavehost) ? $opt_slavehost : hostname);
85			if ($slaveId < 0) {
86			unlink $fname;
87			die "\n>>>>>>>>>>>>> ERROR\n";
88			}
89	dpavlin	1.1	SyncSync($mconn, $sconn);
90
91			my $outf = new IO::File;
92			open $outf, ">$snapshot";
93			print "\n>>>>>>>>>>>>> Prepare Snapshot\n\n" if ($verbose);
94	dpavlin	1.3	$res = PrepareSnapshot($mconn, $sconn, $outf, $slaveId);
95	dpavlin	1.1	close $outf;
96	dpavlin	1.3	if ($res < 0) {
97			unlink $fname;
98			die "\n>>>>>>>>>>>>> ERROR\n";
99			}
100	dpavlin	1.1	if ($res == 0)
101			{
102	dpavlin	1.3	print "\n>>>>>>>>>>>>> DBases are sync-ed\n" if ($verbose);
103			unlink $snapshot unless ($debug);
104			unlink $fname;
105			exit(0);
106	dpavlin	1.1	}
107
108			my $inpf = new IO::File;
109			open $inpf, "<$snapshot";
110			print "\n>>>>>>>>>>>>> Apply Snapshot\n\n" if ($verbose);
111			$res = ApplySnapshot($sconn, $inpf);
112			close $inpf;
113	dpavlin	1.3	if ($res < 0) {
114			unlink $fname;
115			die "\n>>>>>>>>>>>>> ERROR\n";
116			}
117	dpavlin	1.1
118			if ($res > 0)
119			{
120	dpavlin	1.3	print "Snapshot applied\n" if ($verbose);
121			unlink $snapshot unless ($debug);
122			SyncSync($mconn, $sconn);
123	dpavlin	1.1	}
124
125	dpavlin	1.3	unlink $fname;
126	dpavlin	1.1	exit(0);
127
128			###########################################################################
129
130			sub SyncSync
131			{
132			($mconn, $sconn) = @_;
133
134			print "\n>>>>>>>>>>>>> Sync SyncID\n\n" if ($verbose);
135			print "Get last SyncID from Slave DB\n" if ($verbose);
136			$syncid = GetSyncID($sconn);
137			if ($syncid > 0)
138			{
139			print "Last SyncID applied: $syncid\n" if ($verbose);
140			print "Sync SyncID\n" if ($verbose);
141
142	dpavlin	1.3	$res = SyncSyncID($mconn, $slaveId, $syncid);
143	dpavlin	1.1
144			print "Succeeded\n" if (($res > 0) && ($verbose));
145			}
146			}