#!/usr/bin/perl -w
# Plugin for monitor oracle locks
#
# Licenced under GPL v2.
#
# Usage:
#
#       Symlink into /etc/munin/plugins/ and add the monitored
#       database to the filename. e.g.:
#
#       ln -s /usr/share/munin/plugins/oracle__locks \
#         /etc/munin/plugins/oracle_<databasename>_locks
#       This should, however, be given through autoconf and suggest.
#
#       If required, give username, password and/or oracle server
#       host through environment variables.
#
#
# Parameters:
#	autoconf
#       config   (required)
#
# Config variables:
#
#       dbhost     - Which database server to use. Defaults to
#                    'localhost'.
#       dbname     - Which database to use. Defaults to template1
#       dbuser     - A Postgresql user account with read permission to
#                    the given database. Defaults to
#                    'postgres'. Anyway, Munin must be told which user
#                    this plugin should be run as.
#       dbpass     - The corresponding password, if
#                    applicable. Default to undef. Remember that
#                    pg_hba.conf must be configured accordingly.
#
# Magic markers
#%# family=auto
#%# capabilities=autoconf

use strict;
use DBI;

my $dbhost = $ENV{'dbhost'} || '127.0.0.1';
my $dbname = $ENV{'dbname'} || 'ocrl';
my $dbuser = $ENV{'dbuser'} || 'oracle';
my $dbport = $ENV{'dbport'} || '1521';
my $dbpass = $ENV{'dbpass'} || '';

# Check for DBD::Oracle
if (! eval "require DBD::Oracle;") {
     exit 1;
}

my $dsn = "DBI:Oracle:dbname=$dbname;host=$dbhost;port=$dbport;sid=$dbname";
#print "$dsn\n";
my $dbh = DBI->connect ($dsn, $dbuser,
			$dbpass,
			{RaiseError =>1}) || die "";



if (exists $ARGV[0]) {
    if ($ARGV[0] eq 'autoconf') {
	# Check for DBD::Oracle
	if (! eval "require DBD::Oracle;") {
	     print "no (DBD::Oracle not found)";
	     exit 1;
	}
        if ($dbh) {
            print "yes\n";
            exit 0;
        } else {
            print "no Unable to access Database $dbname on host $dbhost as user $dbuser.\nError returned was: ". $DBI::errstr;
            exit 1;
	}
    }

    if ($ARGV[0] eq "config") {
	print "graph_title Oracle locks for $dbname\n";
	print "graph_args --base 1000 -l 0\n";
	print "graph_vlabel Locks\n";
	print "graph_category db\n";
	print "graph_info Shows oracle locks\n";
	print "graph_scale no\n";
	print "RS.label Row Share Locks\n";
	print "RS.info Row Share Oracle locks\n";
	print "RS.type GAUGE\n";
	#print "RS.warning 5\n";
	#print "RS.critical 10\n";
	print "RE.label Row Exclusive locks\n";
	print "RE.info Row Exclusive oracle locks\n";
	print "RE.type GAUGE\n";
	#print "RE.warning 5\n";
	#print "RE.critical 10\n";
	print "S.label Share locks\n";
	print "S.info Row Share oracle locks\n";
	print "S.type GAUGE\n";
	#print "S.warning 5\n";
	#print "S.critical 10\n";
	print "SRX.label Share Row Exclusive locks\n";
	print "SRX.info Share Row Exclusive oracle locks\n";
	print "SRX.type GAUGE\n";
	#print "SRX.warning 5\n";
	#print "SRX.critical 10\n";
	print "X.label Exclusive locks\n";
	print "X.info Exclusive oracle locks\n";
	print "X.type GAUGE\n";
	#print "X.warning 5\n";
	#print "X.critical 10\n";
	print "MR.label Media Recovery (Share) locks\n";
	print "MR.info Media Recovery (Share) oracle locks\n";
	print "MR.type GAUGE\n";
	#print "MR.warning 5\n";
	#print "MR.critical 10\n";
	print "RT.label Redo Thread (Exclusive) locks\n";
	print "RT.info Redo Thread (Exclusive) oracle locks\n";
	print "RT.type GAUGE\n";
	#print "RT.warning 5\n";
	#print "RT.critical 10\n";
	print "XR.label XR locks\n";
	print "XR.info XR oracle locks\n";
	print "XR.type GAUGE\n";
	#print "XR.warning 5\n";
	#print "XR.critical 10\n";
	print "TS.label Temp Segment locks\n";
	print "TS.info Temp Segment oracle locks\n";
	print "TS.type GAUGE\n";
	#print "TS.warning 5\n";
	#print "TS.critical 10\n";
	exit 0;
    }
}

#select MODE_HELD,count(MODE_HELD) from dba_locks group by MODE_HELD;
my $sql="select type,count(*) from v\$lock group by type";
my $sth = $dbh->prepare ($sql);
$sth->execute ();
my $type = 0;
my $count = 0;
my ($RS,$RE,$S,$SRX,$X,$MR,$RT,$XR,$TS) = (0,0,0,0,0,0,0,0,0);
while ( ($type, $count) = $sth->fetchrow ()) {
	#print "$type.value $count\n";
	if ( $type eq "RS" )  {$RS=$count} ;
	if ( $type eq "RE" )  {$RE=$count} ;
	if ( $type eq "S" )   {$S=$count} ;
	if ( $type eq "SRX" ) {$SRX=$count} ;
	if ( $type eq "X" )   {$X=$count} ;
	if ( $type eq "MR" )  {$MR=$count} ;
	if ( $type eq "RT" )  {$RT=$count} ;
	if ( $type eq "XR" )  {$XR=$count} ;
	if ( $type eq "TS" )  {$TS=$count} ;
}
print "RS.value $RS\n";
print "RE.value $RE\n";
print "S.value $S\n";
print "SRX.value $SRX\n";
print "X.value $X\n";
print "MR.value $MR\n";
print "RT.value $RT\n";
print "XR.value $XR\n";
print "TS.value $TS\n";