#!/usr/bin/perl
#!/usr/bin/env perl
# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
BEGIN
{
   $::XCATROOT = $ENV{'XCATROOT'} ? $ENV{'XCATROOT'} : -d '/opt/xcat' ? '/opt/xcat' : '/usr';
}
use lib "$::XCATROOT/lib/perl";
use IO::Socket::SSL;
use XML::Simple;
if ($^O =~ /^linux/i) {
	$XML::Simple::PREFERRED_PARSER='XML::Parser';
}
use Data::Dumper;
use IO::Handle;
use IO::Select;
use xCAT::Utils;
use Getopt::Long;
use POSIX qw(:signal_h :errno_h :sys_wait_h);
use Thread qw(yield);
my $interface;
my $username;
my $help;
Getopt::Long::Configure("require_order");
Getopt::Long::Configure("no_pass_through");
if (!GetOptions(
  "i|interface=s" => \$interface,
  'l|loginname=s' => \$username,
  "nonodecheck" => \$::NONODECHECK,  #does not check the noderange, in this case, noderange need to be a list of nodes.
  'h|help' => \$help,
  ) || $help || scalar(@ARGV)<2 ) {
  print "Usage: psh [-i <interface>] [-l <user>] <noderange> <command>\n";
  exit;
}
my %nodehdl;
my $xcathost='localhost:3001';
if ($ENV{XCATHOST}) {
  $xcathost=$ENV{XCATHOST};
}

my $pshmaxp = 64; #TODO: should this be server dictated or local conf?
my $noderange = $ARGV[0];
my @nodes=();

if ($::NONODECHECK) {
  @nodes=split(/,/, $noderange);
}
else {
  my $client = IO::Socket::SSL->new(
                PeerAddr=>$xcathost,
                SSL_key_file=>$ENV{HOME}."/.xcat/client-cred.pem",
                SSL_cert_file=>$ENV{HOME}."/.xcat/client-cred.pem",
                SSL_ca_file => $ENV{HOME}."/.xcat/ca.pem",
                SSL_use_cert => 1,
                #SSL_verify_mode => 1,
             );
  die "Connection failure: $!\n" unless ($client);
  my %cmdref = (command => 'noderange', noderange => $noderange);
  $SIG{ALRM} = sub { die "No response getting noderange" };
  alarm(15);
  print $client XMLout(\%cmdref,RootName=>'xcatrequest', NoAttr=>1, KeyAttr => []);
  alarm(15);
  my $response="";
  while (<$client>) {
    alarm(0);
    $response .= $_;
    if ($response =~ m/<\/xcatresponse>/) {
      $rsp=XMLin($response, ForceArray => ['node']);
      $response='';
      if ($rsp->{warning}) {
        printf "Warning: ".$rsp->{warning}."\n";
      }
      if ($rsp->{error}) {
        die ("ERROR: ".$rsp->{error}."\n");
      } elsif ($rsp->{node}) {
        @nodes=@{$rsp->{node}};
      }
      if ($rsp->{serverdone}) {
        last;
      }
    }
  }
  close($client);
}

my $children = 0;
my $inputs = new IO::Select;
my %pids; # pid => node
my %errored; # Keep a list of children with non-zero exit codes

# This happens whenever a child dies; keeps track of non-zero exit codes.
sub handle_chld {
  my $pid;
  do { 
    my $pid = waitpid(-1,WNOHANG);
    my $node = $pids{$pid};
    my $exitc = $? >> 8;
    if ($exitc) {
      $errored{$node} = $exitc;
    }
    $children--;
  } until ($pid <= 0);
}
$SIG{CHLD} = \&handle_chld;

if ($interface) {
  foreach (@nodes) {
    s/$/-$interface/;
  }
}
foreach (@nodes) {
  my $node=$_;
  while ($children > $pshmaxp) { processoutput($inputs); }
  my $child;
  $children++;
  sshnode(\$child,$node,$username,@ARGV[1 .. $#ARGV]);
  $inputs->add($child);
  $nodehdl{$child} = $node;
}
while ($inputs->count and $children) {
  processoutput($inputs);
}
while (processoutput($inputs)) {};
wait;
my $exitcode;
if (keys %errored) {
  $exitcode = 2;
  while (my ($node, $exitc) = each(%errored)) {
    print stderr "$node: *** ssh exited with error code $exitc.\n";
  }
}
exit($exitcode);

sub processoutput { #This way, one arbiter handles output, no interrupting
  my $inputs = shift;
  my @readyins = $inputs->can_read(1);
  my $rc = @readyins;
  my $readyh;
  foreach $readyh (@readyins) {
    my $cursel = new IO::Select;
    $cursel->add($readyh);
    while ($cursel->can_read(0)) {
      my $line = <$readyh>;
      unless ($line) {
        $inputs->remove($readyh);
        close($readyh);
        next;
      }
      chomp($line);
      print $nodehdl{$readyh}.": ".$line."\n";
    }
  }
  IO::Handle::flush(stdout);
  yield; #Explicitly give all children a chance to refill any buffers
  return $rc;
}
sub sshnode {
  my $out = shift;
  my $node = shift;
  my $username = shift;
  if (length($username)) { $username = "-l $username"; }
  my $in;
  my $args = join(" ",@_);
  #print "ssh -o BatchMode=yes $username $node " . xCAT::Utils->quote($args) . " 2>&1 |\n";
  my $pid = open($$out,"ssh -o BatchMode=yes $username $node " . xCAT::Utils->quote($args) . " 2>&1 |");
  $pids{$pid} = $node;
}

# vim: set et ts=2 sts=2 sw=2 :