#!/usr/bin/env perl
# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
BEGIN
{
    $::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : '/opt/xcat';
}
use lib "$::XCATROOT/lib/perl";
use xCAT::GlobalDef;
use xCAT::Table;
use xCAT_monitoring::monitorctrl;
#################################################################
# This script is used as a cron job by the xCAT monitoring plug-in
# to monitor the node status. To activate it, simply do
# chtab pname=xCAT monitoring.nodestatmon=Y
################################################################## 

($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)=localtime(time);
printf "%2d-%02d-%04d %02d:%02d:%02d: xcatnodemon started.\n", $mon+1,$mday,$year+1900,$hour,$min,$sec;

#get saved node status from the nodelist table 
my %nodes_status_old=xCAT_monitoring::monitorctrl::getNodeStatus();

#get a list of nodes
my $tmp_node_active=$nodes_status_old{$::STATUS_ACTIVE};
my $tmp_node_inactive=$nodes_status_old{$::STATUS_INACTIVE};
my $tmp_node_unknown=$nodes_status_old{unknown};
#print "active nodes: @$tmp_node_active\n";
#print "inactive nodes: @$tmp_node_inactive\n";
#print "unknown nodes: @$tmp_node_unknown\n";

#get current node status
my %nodes_status_new1=();
if ($tmp_node_active) { %nodes_status_new1=pingNodeStatus(@$tmp_node_active);} 
my %nodes_status_new2=();
if ($tmp_node_inactive) {%nodes_status_new2=pingNodeStatus(@$tmp_node_inactive);}
my %nodes_status_new3=();
if ($tmp_node_unknown) { %nodes_status_new3=pingNodeStatus(@$tmp_node_unknown);}

my $changed1=$nodes_status_new1{$::STATUS_INACTIVE};
my $changed2=$nodes_status_new2{$::STATUS_ACTIVE};
my $changed3=$nodes_status_new3{$::STATUS_INACTIVE};
my $changed4=$nodes_status_new3{$::STATUS_ACTIVE};
my @changed_active=(@$changed2, @$changed4);
my @changed_inactive=(@$changed1, @$changed3);

print "  switch to active:   @changed_active\n";
print "  switch to inactive: @changed_inactive\n";

my %node_status=();
if (@changed_active>0) {
  $node_status{$::STATUS_ACTIVE}=\@changed_active;
} 
if (@changed_inactive>0) {
  $node_status{$::STATUS_INACTIVE}=\@changed_inactive;
}

#only set the node status for the changed ones
if (keys(%node_status) > 0) {
  xCAT_monitoring::monitorctrl::processNodeStatusChanges(\%node_status);
}

($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)=localtime(time);
printf "%2d-%02d-%04d %02d:%02d:%02d: xcatnodemon finished.\n\n", $mon+1,$mday,$year+1900,$hour,$min,$sec;



#--------------------------------------------------------------------------------
=head3    pingNodeStatus
      This function takes an array of nodes and returns their status using fping.
    Arguments:
       nodes-- an array of nodes.
    Returns:
       a hash that has the node status. The format is: 
          {active=>[node1, node3,...], unreachable=>[node4, node2...]}
=cut
#--------------------------------------------------------------------------------
sub pingNodeStatus {
  my @mon_nodes=@_;
  %status=();
  my @active_nodes=();
  my @inactive_nodes=();
  if ((@mon_nodes)&& (@mon_nodes > 0)) {
    #get all the active nodes
    #TODO how to decide the path of fping. how about AIX, does it support fping?
    my $nodes= join(' ', @mon_nodes);
    my $temp=`/usr/sbin/fping -a $nodes 2> /dev/null`;
    chomp($temp);
    @active_nodes=split(/\n/, $temp);

    #get all the inactive nodes by substracting the active nodes from all.
    my %temp2;
    if ((@active_nodes) && ( @active_nodes > 0)) {
      foreach(@active_nodes) { $temp2{$_}=1};
        foreach(@mon_nodes) {
          if (!$temp2{$_}) { push(@inactive_nodes, $_);}
        }
    }
    else {@inactive_nodes=@mon_nodes;}     
  }

  
  $status{$::STATUS_ACTIVE}=\@active_nodes;
  $status{$::STATUS_INACTIVE}=\@inactive_nodes;
 
  return %status;
}