#!/usr/bin/env perl
# IBM(c) 2012 EPL license http://www.eclipse.org/legal/epl-v10.html
package xCAT_monitoring::gangliamon;

BEGIN {
    $::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : '/opt/xcat';
}
use lib "$::XCATROOT/lib/perl";
use xCAT::NodeRange;
use Sys::Hostname;
use Socket;
use xCAT::Utils;
use xCAT::GlobalDef;
use xCAT_monitoring::monitorctrl;
use xCAT::MsgUtils;
use xCAT::TableUtils;
use strict;
use warnings;
1;

#-------------------------------------------------------------------------------

=head1  xCAT_monitoring:gangliamon  
=head2  Package Description
  xCAT monitoring plugin to handle Ganglia monitoring.
=cut

#-------------------------------------------------------------------------------

#--------------------------------------------------------------------------------

=head3    start
    This function gets called by the monitorctrl module when xcatd starts and 
    when monstart command is issued by the user. It starts the daemons and 
    does necessary startup process for the Ganglia monitoring. 

    p_nodes     -- A pointer to an arrays of nodes to be monitored. null means all.
    scope       -- The action scope, it indicates the node type the action will take place.
                    0 means localhost only.
                    2 means all nodes (except localhost),
    callback    -- The callback pointer for error and status displaying. It can be null.
    
    Returns:
        (return code, message)
        If the callback is set, use callback to display the status and error.
=cut

#--------------------------------------------------------------------------------
sub start {
    print "gangliamon::start called\n";
    my $noderef = shift;
    if ( $noderef =~ /xCAT_monitoring::gangliamon/ ) {
        $noderef = shift;
    }

    my $scope     = shift;
    my $callback  = shift;
    my $localhost = hostname();
    my $OS        = `uname`;

    # Handle starting monitoring for localhost
    # monstart gangliamon
    if (!$scope) {
        my $res_gmond = '';
        if ( $OS =~ /AIX/ ) {
            $res_gmond = `/etc/rc.d/init.d/gmond restart 2>&1`;
        } else {
            $res_gmond = `/etc/init.d/gmond restart 2>&1`;
        }
        
        my $tmp;
        if ($?) {
            if ($callback) {
                my $resp = {};
                $resp->{data}->[0] = "$localhost: Ganglia Gmond not started successfully: $res_gmond\n";
                $callback->($resp);
            } else {
                xCAT::MsgUtils->message( 'S', "[mon]: $res_gmond\n" );
            }
    
            return ( 1, "Ganglia Gmond not started successfully.\n" );
        }
    
        my $res_gmetad = '';
        if ( $OS =~ /AIX/ ) {
    
            # Do not restart gmetad while it is running, else you will lose all data in the database
            $tmp = `/etc/rc.d/init.d/gmetad status | grep running`;
            if ( !$tmp ) {
                $res_gmetad = `/etc/rc.d/init.d/gmetad restart 2>&1`;
            }
        } else {
            $tmp = `/etc/init.d/gmetad status | grep running`;
            if ( !$tmp ) {
                $res_gmetad = `/etc/init.d/gmetad restart 2>&1`;
            }
        }
    
        if ($?) {
            if ($callback) {
                my $resp = {};
                $resp->{data}->[0] = "$localhost: Ganglia Gmetad not started successfully:$res_gmetad\n";
                $callback->($resp);
            } else {
                xCAT::MsgUtils->message( 'S', "[mon]: $res_gmetad\n" );
            }
    
            return ( 1, "Ganglia Gmetad not started successfully.\n" );
        }
    } else {
        # Handle starting monitoring for localhost
        # monstart gangliamon -r
        
        my $OS        = `uname`;
        my $pPairHash = xCAT_monitoring::monitorctrl->getMonServer($noderef);
        if ( ref($pPairHash) eq 'ARRAY' ) {
            if ($callback) {
                my $resp = {};
                $resp->{data}->[0] = $pPairHash->[1];
                $callback->($resp);
            } else {
                xCAT::MsgUtils->message( 'S', "[mon]: " . $pPairHash->[1] );
            }
            
            return ( 1, "" );
        }

        # Identification of this node
        my @hostinfo = xCAT::NetworkUtils->determinehostname();
        my $isSV     = xCAT::Utils->isServiceNode();
        my %iphash   = ();
        foreach (@hostinfo) {
            $iphash{$_} = 1;
        }

        if ( !$isSV ) {
            $iphash{'noservicenode'} = 1;
        }

        my @children;
        foreach my $key ( keys(%$pPairHash) ) {
            my @key_a = split( ':', $key );
            if ( !$iphash{ $key_a[0] } ) {
                next;
            }
            my $mon_nodes = $pPairHash->{$key};

            foreach (@$mon_nodes) {
                my $node     = $_->[0];
                my $nodetype = $_->[1];
                if ( ($nodetype) && ( $nodetype =~ /$::NODETYPE_OSI/ ) ) {
                    push( @children, $node );
                }
            }
        }

        my $rec    = undef;
        my $result = undef;
        if ( exists( $children[0] ) ) {
            $rec = join( ',', @children );
        }

        if ($rec) {
            if ( $OS =~ /AIX/ ) {
                $result = `XCATBYPASS=Y $::XCATROOT/bin/xdsh  $rec /etc/rc.d/init.d/gmond restart 2>&1`;
            }
            else {
                $result = `XCATBYPASS=Y $::XCATROOT/bin/xdsh  $rec /etc/init.d/gmond restart 2>&1`;
            }
        }

        if ($result) {
            if ($callback) {
                my $resp = {};
                $resp->{data}->[0] = "$localhost: $result\n";
                $callback->($resp);
            }
            else {
                xCAT::MsgUtils->message( 'S', "[mon]: $result\n" );
            }
        }
    }

    if ($callback) {
        my $resp = {};
        $resp->{data}->[0] = "$localhost: started\n";
        $callback->($resp);
    }

    return ( 0, "started" );
}

#--------------------------------------------------------------

=head3    config
    This function configures the cluster for the given nodes. This function is called 
    when moncfg command is issued or when xcatd starts on the service node. It will 
    configure the cluster to include the given nodes within the monitoring domain. This 
    calls two other functions called as confGmond and confGmetad which are used for configuring
    the Gmond and Gmetad configuration files respectively.
    
    Arguments:
        p_nodes     -- A pointer to an arrays of nodes to be added for monitoring. none means all.
        scope       -- The action scope, it indicates the node type the action will take place.
                        0 means localhost only. 
                        2 means localhost and nodes, 
        callback    -- The callback pointer for error and status displaying. It can be null.
    Returns:
        (error code, error message)
=cut 

#--------------------------------------------------------------
sub config {
    print "gangliamon: config called\n";
    my $noderef = shift;
    if ( $noderef =~ /xCAT_monitoring::gangliamon/ ) {
        $noderef = shift;
    }

    my $scope    = shift;
    my $callback = shift;

    confGmond( $noderef, $scope, $callback );
    confGmetad( $noderef, $scope, $callback );
}

#--------------------------------------------------------------

=head3    confGmond
    This function is called by the config() function. It configures the Gmond 
    configuration files for the given nodes
    
    Arguments:
        p_nodes      -- A pointer to an arrays of nodes to be added for monitoring. none means all.
        scope        -- The action scope, it indicates the node type the action will take place.
                        0 means localhost only. 
                        2 means localhost and nodes, 
        callback     -- The callback pointer for error and status displaying. It can be null.
    Returns: none
=cut

#--------------------------------------------------------------
sub confGmond {
    print "gangliamon: confGmond called\n";
    no warnings;

    my $noderef = shift;
    if ( $noderef =~ /xCAT_monitoring::gangliamon/ ) {
        $noderef = shift;
    }

    my $scope          = shift;
    my $callback       = shift;
    my $configure_file = '';
    my $localhost      = hostname();
    chomp( my $hostname = `hostname` );

    # Version 3.1.0
    if ( -e "/etc/ganglia/gmond.conf" ) {
        $configure_file = '/etc/ganglia/gmond.conf';
    }

    # Version 3.0.7
    elsif ( -e "/etc/gmond.conf" ) {
        $configure_file = '/etc/gmond.conf';
    }

    # Monintoring should be installed
    else {
        if ($callback) {
            my $resp = {};
            $resp->{data}->[0] = "gangliamon: Please install Ganglia.";
            $callback->($resp);
        } else {
            xCAT::MsgUtils->message( 'E', "gangliamon: Please install Ganglia.\n" );
        }
        return;
    }

    my $pPairHash = xCAT_monitoring::monitorctrl->getMonServer($noderef);
    if ( ref($pPairHash) eq 'ARRAY' ) {
        if ($callback) {
            my $resp = {};
            $resp->{data}->[0] = $pPairHash->[1];
            $callback->($resp);
        }
        else {
            xCAT::MsgUtils->message( 'S', "[mon]: " . $pPairHash->[1] );
        }
        return ( 1, "" );
    }

    # Identification of this node
    my @hostinfo = xCAT::NetworkUtils->determinehostname();
    my $isSV     = xCAT::Utils->isServiceNode();
    my %iphash   = ();
    foreach (@hostinfo) {
        $iphash{$_} = 1;
    }

    if ( !$isSV ) {
        $iphash{'noservicenode'} = 1;
    }

    # Backup the original file
    `/bin/cp -f $configure_file $configure_file.orig`;
    `/bin/rm -f $configure_file`;
    `/bin/touch $configure_file`;
    open( FILE, "+>>$configure_file" );
    my $fname = "$configure_file.orig";
    unless ( open( CONF, $fname ) ) {
        return (0);
    }

    my $hasdone_udp_send_channel;
    while (<CONF>) {
        my $str = $_;
        $str =~ s/setuid = yes/setuid = no/;
        if ( $str =~ /^\s*bind / ) {
            $str =~ s/bind/#bind/; # Comment out bind
        }
     
        # replace the mcast_join in the udp_send_channel section
        if (!$hasdone_udp_send_channel && $str =~ /^\s*mcast_join =/) {
            $str =~ s/mcast_join = .*/host = $hostname/;
            $hasdone_udp_send_channel = 1;
        }
    
        foreach my $key ( keys(%$pPairHash) ) {
            my @key_a = split( ':', $key );
            if ( !$iphash{ $key_a[0] } ) {
                next;
            }
            
            my $pattern = '^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})';
            if ( $key_a[0] !~ /$pattern/ ) {
                my $cluster = $key_a[0];
                if ( -e "/etc/xCATSN" ) {
                    $str =~ s/name = "unspecified"/name="$cluster"/;
                }
            }
        }
    
        $str =~ s/name = "unspecified"/name="$hostname"/;
    
        if ( $hasdone_udp_send_channel && $str =~ m/^\s*mcast_join/ ) {
            $str =~ s/mcast_join/#mcast_join/; # Comment out mcast_join in the udp_recv_channel section
        }
        
        $str =~ s/# xCAT gmond settings done//; # Remove old message
        print FILE $str;
    }
    print FILE "# xCAT gmond settings done\n";
    close(CONF);
    close(FILE);

    if ($scope) {
        my @children;
        my $install_root = xCAT::TableUtils->getInstallDir();
        foreach my $key ( keys(%$pPairHash) ) {
            my @key_a = split( ':', $key );
            if ( !$iphash{ $key_a[0] } ) {
                next;
            }

            my $mon_nodes = $pPairHash->{$key};

            foreach (@$mon_nodes) {
                my $node     = $_->[0];
                my $nodetype = $_->[1];

                if ( ($nodetype) && ( $nodetype =~ /$::NODETYPE_OSI/ ) ) {
                    push( @children, $node );
                }
            }

            my $node = join( ',', @children );
            my $res_cp = `XCATBYPASS=Y $::XCATROOT/bin/xdcp $node $install_root/postscripts/confGang /tmp 2>&1`;
            if ($?) {
                if ($callback) {
                    my $resp = {};
                    $resp->{data}->[0] = "$localhost: $res_cp";
                    $callback->($resp);
                } else {
                    xCAT::MsgUtils->message( 'S',
                        "Cannot copy confGang into /tmp: $res_cp \n" );
                }
            }

            my $res_conf;
            if ( $key_a[0] =~ /noservicenode/ ) {
                $res_conf = `XCATBYPASS=Y $::XCATROOT/bin/xdsh $node MONSERVER=$hostname MONMASTER=$key_a[1] /tmp/confGang 2>&1`;
            } else {
                $res_conf = `XCATBYPASS=Y $::XCATROOT/bin/xdsh $node MONSERVER=$key_a[0] MONMASTER=$key_a[1] /tmp/confGang 2>&1`;
            }

            if ($?) {
                if ($callback) {
                    my $resp = {};
                    $resp->{data}->[0] = "$localhost: $res_conf";
                    $callback->($resp);
                } else {
                    xCAT::MsgUtils->message( 'S',
                        "Cannot configure gmond in nodes: $res_conf \n" );
                }
            }
        }

    }
}

#--------------------------------------------------------------

=head3    confGmetad
    This function is called by the config() function. It configures the Gmetad
    configuration files for the given nodes
    
    Arguments:
        p_nodes     -- A pointer to an arrays of nodes to be added for monitoring. none means all.
        scope       -- The action scope, it indicates the node type the action will take place.
                        0 means localhost only. 
                        2 means localhost and nodes, 
        callback    -- The callback pointer for error and status displaying. It can be null.
    Returns : none
=cut

#--------------------------------------------------------------
sub confGmetad {
    print "gangliamon: confGmetad called \n";

    my $noderef = shift;
    if ( $noderef =~ /xCAT_monitoring::gangliamon/ ) {
        $noderef = shift;
    }
    my $scope          = shift;
    my $callback       = shift;
    my $configure_file = '';
    my $localhost      = hostname();

    chomp( my $hostname = `hostname` );

    # Version 3.1.0
    if ( -e "/etc/ganglia/gmetad.conf" ) {
        $configure_file = '/etc/ganglia/gmetad.conf';
    }

    # Version 3.0.7
    elsif ( -e "/etc/gmetad.conf" ) {
        $configure_file = '/etc/gmetad.conf';
    }

    # Monitoring should be installed
    else {
        return;
    }
    
    # Backup the original file
    `/bin/cp -f $configure_file $configure_file.orig`;

    # Create new file from scratch
    `/bin/rm -f $configure_file`;
    `/bin/touch $configure_file`;

    open( OUTFILE, "+>>$configure_file" )
      or die("Cannot open file \n");
    print( OUTFILE "# Setting up GMETAD configuration file \n" );

    if ( -e "/etc/xCATMN" ) {
        print( OUTFILE "data_source \"$hostname\" localhost \n" );
    }
    
    my $noderef = xCAT_monitoring::monitorctrl->getMonHierarchy();
    if ( ref($noderef) eq 'ARRAY' ) {
        if ($callback) {
            my $resp = {};
            $resp->{data}->[0] = $noderef->[1];
            $callback->($resp);
        } else {
            xCAT::MsgUtils->message( 'S', "[mon]: " . $noderef->[1] );
        }
        return ( 1, "" );
    }

    my @hostinfo = xCAT::NetworkUtils->determinehostname();
    my $isSV     = xCAT::Utils->isServiceNode();
    my %iphash   = ();
    foreach (@hostinfo) { $iphash{$_} = 1; }
    if ( !$isSV ) {
        $iphash{'noservicenode'} = 1;
    }

    my @children;
    my $cluster;
    foreach my $key ( keys(%$noderef) ) {
        my @key_g = split( ':', $key );
        if ( !$iphash{ $key_g[0] } ) {
            next;
        }

        my $mon_nodes = $noderef->{$key};
        my $pattern   = '^(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})';
        if ( $key_g[0] !~ /$pattern/ ) {
            no warnings;
            $cluster = $key_g[0];
        }

        foreach (@$mon_nodes) {
            my $node     = $_->[0];
            my $nodetype = $_->[1];
            if ( ($nodetype) && ( $nodetype =~ /$::NODETYPE_OSI/ ) ) {
                push( @children, $node );
            }
        }
    }

    my $num = @children;
    if ( -e "/etc/xCATSN" ) {
        print( OUTFILE "gridname \"$cluster\"\n" );
        print( OUTFILE "data_source \"$cluster\" localhost\n" );
        my $master = xCAT::TableUtils->get_site_Master();
        print( OUTFILE "trusted_hosts $master\n" );
    } else {
        for ( my $j = 0 ; $j < $num ; $j++ ) {
            print( OUTFILE
                "data_source \"$children[ $j ]\" $children[ $j ]  \n"
            );
        }
    }

    print( OUTFILE "# xCAT gmetad settings done \n" );
    close(OUTFILE);
}

#--------------------------------------------------------------

=head3    deconfig
    This function de-configures the cluster for the given nodes. This function is called 
    when mondecfg command is issued by the user. This function restores the original Gmond
    and Gmetad configuration files by calling the deconfGmond and deconfGmetad functions 
    respectively.
      
    Arguments:
        p_nodes     -- A pointer to an arrays of nodes to be removed for monitoring. none means all.
        scope       -- The action scope, it indicates the node type the action will take place.
                        0 means local host only. 
                        2 means both local host and nodes, 
        callback    -- The callback pointer for error and status displaying. It can be null.
    Returns: none
=cut 

#--------------------------------------------------------------
sub deconfig {
    print "gangliamon: deconfig called\n";
    my $noderef = shift;
    if ( $noderef =~ /xCAT_monitoring::gangliamon/ ) {
        $noderef = shift;
    }

    my $scope    = shift;
    my $callback = shift;

    deconfGmond( $noderef, $scope, $callback );
    deconfGmetad( $noderef, $scope, $callback );
}

#--------------------------------------------------------------

=head3    deconfGmond
    This function is called by the deconfig() function. It deconfigures the Gmetad
    configuration files for the given nodes
    
    Arguments:
        p_nodes     -- A pointer to an arrays of nodes to be added for monitoring. none means all.
        scope       -- The action scope, it indicates the node type the action will take place.
                        0 means localhost only. 
                        2 means localhost and nodes, 
        callback    -- The callback pointer for error and status displaying. It can be null.
    Returns:none
=cut

#--------------------------------------------------------------
sub deconfGmond {
    print "gangliamon: deconfGmond called \n";
    no warnings;
    my $noderef = shift;

    if ( $noderef =~ /xCAT_monitoring::gangliamon/ ) {
        $noderef = shift;
    }

    my $scope    = shift;
    my $callback = shift;

    my $localhost = hostname();

    if ( -e "/etc/ganglia/gmond.conf" ) { # v3.1.0
        `/bin/cp -f /etc/ganglia/gmond.conf /etc/ganglia/gmond.conf.save`;
        my $decon_gmond = `/bin/cp -f /etc/ganglia/gmond.conf.orig /etc/ganglia/gmond.conf`;
        if ($?) {
            if ($callback) {
                my $resp = {};
                $resp->{data}->[0] = "$localhost:$decon_gmond";
                $callback->($resp);
            }
            else {
                xCAT::MsgUtils->message( 'S', "Gmond not deconfigured $decon_gmond \n" );
            }
        }
    } else { # v3.0.7
        `/bin/cp -f /etc/gmond.conf /etc/gmond.conf.save`;
        my $decon_gmond = `/bin/cp -f /etc/gmond.conf.orig /etc/gmond.conf`;
        if ($?) {
            if ($callback) {
                my $resp = {};
                $resp->{data}->[0] = "$localhost:$decon_gmond";
                $callback->($resp);
            } else {
                xCAT::MsgUtils->message( 'S', "Gmond not deconfigured $decon_gmond \n" );
            }
        }
    }

    if ($scope) {
        my $pPairHash = xCAT_monitoring::monitorctrl->getMonServer($noderef);
        if ( ref($pPairHash) eq 'ARRAY' ) {
            if ($callback) {
                my $resp = {};
                $resp->{data}->[0] = $pPairHash->[1];
                $callback->($resp);
            }
            else {
                xCAT::MsgUtils->message( 'S', "[mon]: " . $pPairHash->[1] );
            }
            return ( 1, "" );
        }

        # Identification of this node
        my @hostinfo = xCAT::NetworkUtils->determinehostname();
        my $isSV     = xCAT::Utils->isServiceNode();
        my %iphash   = ();
        foreach (@hostinfo) { $iphash{$_} = 1; }
        if ( !$isSV ) { $iphash{'noservicenode'} = 1; }

        my @children;
        foreach my $key ( keys(%$pPairHash) ) {
            my @key_a = split( ':', $key );
            if ( !$iphash{ $key_a[0] } ) { next; }
            my $mon_nodes = $pPairHash->{$key};

            foreach (@$mon_nodes) {
                my $node     = $_->[0];
                my $nodetype = $_->[1];
                if ( ($nodetype) && ( $nodetype =~ /$::NODETYPE_OSI/ ) ) {
                    push( @children, $node );
                }
            }

            my $node = join( ',', @children );
            if ( -e "/etc/ganglia/gmond.conf" ) { # v3.1.0
                my $res_sv = `XCATBYPASS=Y $::XCATROOT/bin/xdsh $node /bin/cp -f /etc/ganglia/gmond.conf /etc/ganglia/gmond.conf.save`;
                my $res_cp = `XCATBYPASS=Y $::XCATROOT/bin/xdsh $node /bin/cp -f /etc/ganglia/gmond.conf.orig /etc/ganglia/gmond.conf`;
                if ($?) {
                    if ($callback) {
                        my $resp = {};
                        $resp->{data}->[0] = "$localhost: $res_cp";
                        $callback->($resp);
                    } else {
                        xCAT::MsgUtils->message( 'S', "Gmond not deconfigured: $res_cp \n" );
                    }
                }
            }

            else {
                my $res_sv = `XCATBYPASS=Y $::XCATROOT/bin/xdsh $node /bin/cp -f /etc/gmond.conf /etc/gmond.conf.save`;

                my $res_cp = `XCATBYPASS=Y $::XCATROOT/bin/xdsh $node /bin/cp -f /etc/gmond.conf.orig /etc/gmond.conf`;
                if ($?) {
                    if ($callback) {
                        my $resp = {};
                        $resp->{data}->[0] = "$localhost: $res_cp";
                        $callback->($resp);
                    }
                    else {
                        xCAT::MsgUtils->message( 'S',
                            "Gmond not deconfigured: $res_cp \n" );
                    }
                }
            }
        }
    }
}

#--------------------------------------------------------------

=head3    deconfGmetad
    This function is called by the deconfig() function. It deconfigures the Gmetad
    configuration files for the given nodes
    
    Arguments:
        p_nodes     -- A pointer to an arrays of nodes to be added for monitoring. none means all.
        scope       -- The action scope, it indicates the node type the action will take place.
                        0 means localhost only. 
                        2 means localhost and nodes, 
        callback    -- The callback pointer for error and status displaying. It can be null.
    Returns:none
=cut

#--------------------------------------------------------------
sub deconfGmetad {
    print "gangliamon: deconfGmetad called \n";
    no warnings;
    my $noderef = shift;
    if ( $noderef =~ /xCAT_monitoring::gangliamon/ ) {
        $noderef = shift;
    }
    my $scope    = shift;
    my $callback = shift;

    my $localhost = hostname();

    if ( -e "/etc/ganglia/gmetad.conf" ) { # v3.1.0
        `/bin/cp -f /etc/ganglia/gmetad.conf /etc/ganglia/gmetad.conf.save`;
        my $decon_gmetad = `/bin/cp -f /etc/ganglia/gmetad.conf.orig /etc/ganglia/gmetad.conf`;
        if ($?) {
            if ($callback) {
                my $resp = {};
                $resp->{data}->[0] = "$localhost: $decon_gmetad";
                $callback->($resp);
            } else {
                xCAT::MsgUtils->message( 'S', "Gmetad not deconfigured $decon_gmetad \n" );
            }
        }
    } else { # v3.0.7
        `/bin/cp -f /etc/gmetad.conf /etc/gmetad.conf.save`;
        my $decon_gmetad = `/bin/cp -f /etc/gmetad.conf.orig /etc/gmetad.conf`;
        if ($?) {
            if ($callback) {
                my $resp = {};
                $resp->{data}->[0] = "$localhost: $decon_gmetad";
                $callback->($resp);
            } else {
                xCAT::MsgUtils->message( 'S', "Gmetad not deconfigured $decon_gmetad \n" );
            }
        }
    }
}

#--------------------------------------------------------------------------------

=head3    stop
    This function gets called by the monitorctrl module when
    xcatd stops or when monstop command is issued by the user.
    It stops the monitoring on all nodes, stops
    the daemons and does necessary cleanup process for the
    Ganglia monitoring.

    Arguments:
        p_nodes     -- A pointer to an arrays of nodes to be stoped for monitoring. null means all.
        scope       -- The action scope, it indicates the node type the action will take place.
                        0 means localhost only.
                        2 means all nodes (except localhost),
        callback    -- The callback pointer for error and status displaying. It can be null.
    Returns:
        (return code, message)
        if the callback is set, use callback to display the status and error.
=cut

#--------------------------------------------------------------------------------
sub stop {
    print "gangliamon::stop called\n";
    my $noderef = shift;
    if ( $noderef =~ /xCAT_monitoring::gangliamon/ ) {
        $noderef = shift;
    }
    my $scope     = shift; # Scope is always 2
    my $callback  = shift;
    my $localhost = hostname();
    my $OS        = `uname`;

    if (!$scope) {
        # Handle stopping monitoring on localhost
        # monstop gangliamon
        
        my $res_gmond;
        if ( $OS =~ /AIX/ ) {
            $res_gmond = `/etc/rc.d/init.d/gmond stop 2>&1`;
        } else {
            $res_gmond = `/etc/init.d/gmond stop 2>&1`;
        }
        if ($?) {
            if ($callback) {
                my $resp = {};
                $resp->{data}->[0] = "$localhost: Ganglia Gmond not stopped successfully: $res_gmond \n";
                $callback->($resp);
            } else {
                xCAT::MsgUtils->message( 'S', "[mon]: $res_gmond \n" );
            }
    
            return ( 1, "Ganglia Gmond not stopped successfully. \n" );
        }
    
        my $res_gmetad;
        if ( $OS =~ /AIX/ ) {
            $res_gmetad = `/etc/rc.d/init.d/gmetad stop 2>&1`;
        } else {
            $res_gmetad = `/etc/init.d/gmetad stop 2>&1`;
        }
    
        if ($?) {
            if ($callback) {
                my $resp = {};
                $resp->{data}->[0] = "$localhost: Ganglia Gmetad not stopped successfully:$res_gmetad \n";
                $callback->($resp);
            } else {
                xCAT::MsgUtils->message( 'S', "[mon]: $res_gmetad \n" );
            }
    
            return ( 1, "Ganglia Gmetad not stopped successfully. \n" );
        }
    } else {
        # Handle stopping monitoring for given noderange
        # monstop gangliamon -r
        
        my $OS        = `uname`;
        my $pPairHash = xCAT_monitoring::monitorctrl->getMonServer($noderef);
        if ( ref($pPairHash) eq 'ARRAY' ) {
            if ($callback) {
                my $resp = {};
                $resp->{data}->[0] = $pPairHash->[1];
                $callback->($resp);
            } else {
                xCAT::MsgUtils->message( 'S', "[mon]: " . $pPairHash->[1] );
            }
            return ( 1, "" );
        }

        #identification of this node
        my @hostinfo = xCAT::NetworkUtils->determinehostname();
        my $isSV     = xCAT::Utils->isServiceNode();
        my %iphash   = ();
        foreach (@hostinfo) { $iphash{$_} = 1; }
        if ( !$isSV ) { $iphash{'noservicenode'} = 1; }

        my @children;
        foreach my $key ( keys(%$pPairHash) ) {
            my @key_a = split( ':', $key );
            if ( !$iphash{ $key_a[0] } ) { next; }
            my $mon_nodes = $pPairHash->{$key};

            foreach (@$mon_nodes) {
                my $node     = $_->[0];
                my $nodetype = $_->[1];
                if ( ($nodetype) && ( $nodetype =~ /$::NODETYPE_OSI/ ) ) {
                    push( @children, $node );
                }
            }
        }
        my $result = undef;
        my $rec    = undef;
        if ( exists( $children[0] ) ) {
            $rec = join( ',', @children );
        }
        if ($rec) {
            if ( $OS =~ /AIX/ ) {
                $result = `XCATBYPASS=Y $::XCATROOT/bin/xdsh  $rec /etc/rc.d/init.d/gmond stop 2>&1`;
            } else {
                $result = `XCATBYPASS=Y $::XCATROOT/bin/xdsh  $rec /etc/init.d/gmond stop 2>&1`;
            }
        }

        if ($result) {
            if ($callback) {
                my $resp = {};
                $resp->{data}->[0] = "$localhost: $result\n";
                $callback->($resp);
            } else {
                xCAT::MsgUtils->message( 'S', "[mon]: $result\n" );
            }
        }
    }
    
    if ($callback) {
        my $resp = {};
        $resp->{data}->[0] = "$localhost: stopped. \n";
        $callback->($resp);
    }

    return ( 0, "stopped" );
}

#--------------------------------------------------------------------------------

=head3    supportNodeStatusMon
    This function is called by the monitorctrl module to check
    if Ganglia can help monitoring and returning the node status.
    
    Arguments: None
    Returns: 1  
=cut

#--------------------------------------------------------------------------------
sub supportNodeStatusMon {
    return 1;
}

#--------------------------------------------------------------------------------

=head3   startNodeStatusMon
    This function is called by the monitorctrl module to tell
    Ganglia to start monitoring the node status and feed them back
    to xCAT. Ganglia will start setting up the condition/response 
    to monitor the node status changes.  

    Arguments: None
    Returns:
        (return code, message)

=cut

#--------------------------------------------------------------------------------
sub startNodeStatusMon {
    return ( 0, "started" );
}

#--------------------------------------------------------------------------------

=head3   stopNodeStatusMon
    This function is called by the monitorctrl module to tell
    Ganglia to stop feeding the node status info back to xCAT. It will
    stop the condition/response that is monitoring the node status.

    Arguments: None
    Returns:
        (return code, message)
=cut

#--------------------------------------------------------------------------------
sub stopNodeStatusMon {
    return ( 0, "stopped" );
}

#--------------------------------------------------------------------------------

=head3    getDiscription
    This function returns the detailed description of the plugin inluding the
    valid values for its settings in the monsetting tabel. 
    
    Arguments: None
    Returns: The description
=cut

#--------------------------------------------------------------------------------
sub getDescription {
    return "Description: This plugin will help interface the xCAT cluster with Gangliam monitoring software\n";
}

#--------------------------------------------------------------------------------

=head3    getPostscripts
    This function returns the postscripts needed for the nodes.

    Arguments: None
    Returns:
        The the postscripts. It a pointer to an array with the node group names as the keys
        and the comma separated poscript names as the value. For example:
        {service=>"cmd1,cmd2", xcatdefaults=>"cmd3,cmd4"} where xcatdefults is a group
        of all nodes including the service nodes.
=cut

#--------------------------------------------------------------------------------
sub getPostscripts {
    my $ret = {};
    $ret->{compute} = "confGang";
    return $ret;
}