# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html package xCAT::NodeRange; require xCAT::Table; require Data::Dumper; require Exporter; use strict; #Perl implementation of noderange our @ISA = qw(Exporter); our @EXPORT = qw(noderange nodesmissed); my $missingnodes=[]; my $nodelist; #=xCAT::Table->new('nodelist',-create =>1); #my $nodeprefix = "node"; sub subnodes (\@@) { #Subtract set of nodes from the first list my $nodes = shift; my $node; foreach $node (@_) { @$nodes = (grep(!/^$node$/,@$nodes)); } } sub nodesmissed { return @$missingnodes; } sub expandatom { my $atom = shift; my $verify = (scalar(@_) == 1 ? shift : 1); my @nodes= (); #TODO: these env vars need to get passed by the client to xcatd my $nprefix=(defined ($ENV{'XCAT_NODE_PREFIX'}) ? $ENV{'XCAT_NODE_PREFIX'} : 'node'); my $nsuffix=(defined ($ENV{'XCAT_NODE_SUFFIX'}) ? $ENV{'XCAT_NODE_SUFFIX'} : ''); if ($nodelist->getAttribs({node=>$atom},'node')) { #The atom is a plain old nodename return ($atom); } if ($atom =~ /^\(.*\)$/) { # handle parentheses by recursively calling noderange() $atom =~ s/^\((.*)\)$/$1/; return noderange($atom); } # Try to match groups? foreach($nodelist->getAllAttribsWhere("groups like '%".$atom."%'",'node','groups')) { my @groups=split(/,/,$_->{groups}); #The where clause doesn't guarantee the atom is a full group name, only that it could be if (grep { $_ eq "$atom" } @groups ) { push @nodes,$_->{node}; } } if ($atom =~ m/^[0-9]+\z/) { # if only numbers, then add the prefix my $nodename=$nprefix.$atom.$nsuffix; return expandatom($nodename,$verify); } my $nodelen=@nodes; if ($nodelen > 0) { return @nodes; } if ($atom =~ m/^\//) { # A regular expression unless ($verify) { # If not in verify mode, regex makes zero possible sense return ($atom); } #TODO: check against all groups $atom = substr($atom,1); foreach ($nodelist->getAllAttribs('node')) { if ($_->{node} =~ m/^${atom}$/) { push(@nodes,$_->{node}); } } return(@nodes); } if ($atom =~ m/(.*)\[(.*)\](.*)/) { # square bracket range #for the time being, we are only going to consider one [] per atom #xcat 1.2 does no better my @subelems = split(/([\,\-\:])/,$2); my $subrange=""; while (my $subelem = shift @subelems) { my $subop=shift @subelems; $subrange=$subrange."$1$subelem$3$subop"; } foreach (split /,/,$subrange) { my @newnodes=expandatom($_,$verify); @nodes=(@nodes,@newnodes); } return @nodes; } if ($atom =~ m/\+/) { # process the + operator $atom =~ m/^([^0-9]*)([0-9]+)([^\+]*)\+([0-9]+)/; my $pref=$1; my $startnum=$2; my $suf=$3; my $end=$4+$startnum; my $endnum = sprintf("%d",$end); if (length ($startnum) > length ($endnum)) { $endnum = sprintf("%0".length($startnum)."d",$end); } if (($pref eq "") && ($suf eq "")) { $pref=$nprefix; $suf=$nsuffix; } foreach ("$startnum".."$endnum") { my @addnodes=expandatom($pref.$_.$suf,$verify); @nodes=(@nodes,@addnodes); } return (@nodes); } if ($atom =~ m/[-:]/) { # process the minus range operator my $left; my $right; if ($atom =~ m/:/) { ($left,$right)=split /:/,$atom; } else { my $count= ($atom =~ tr/-//); if (($count % 2)==0) { #can't understand even numbers of - in range context if ($verify) { push @$missingnodes,$atom; return (); } else { #but we might not really be in range context, if noverify return ($atom); } } my $expr="([^-]+?".("-[^-]*"x($count/2)).")-(.*)"; $atom =~ m/$expr/; $left=$1; $right=$2; } if ($left eq $right) { #if they said node1-node1 for some strange reason return expandatom($left,$verify); } my @leftarr=split(/(\d+)/,$left); my @rightarr=split(/(\d+)/,$right); if (scalar(@leftarr) != scalar(@rightarr)) { #Mismatch formatting.. if ($verify) { push @$missingnodes,$atom; return (); #mismatched range, bail. } else { #Not in verify mode, just have to guess it's meant to be a nodename return ($atom); } } my $prefix = ""; my $suffix = ""; foreach (0..$#leftarr) { my $idx = $_; if ($leftarr[$idx] =~ /^\d+$/ and $rightarr[$idx] =~ /^\d+$/) { #pure numeric component if ($leftarr[$idx] ne $rightarr[$idx]) { #We have found the iterator (only supporting one for now) my $prefix = join('',@leftarr[0..($idx-1)]); #Make a prefix of the pre-validated parts my $luffix; #However, the remainder must still be validated to be the same my $ruffix; if ($idx eq $#leftarr) { $luffix=""; $ruffix=""; } else { $ruffix = join('',@rightarr[($idx+1)..$#rightarr]); $luffix = join('',@leftarr[($idx+1)..$#leftarr]); } if ($luffix ne $ruffix) { #the suffixes mismatched.. if ($verify) { push @$missingnodes,$atom; return (); } else { return ($atom); } } foreach ($leftarr[$idx]..$rightarr[$idx]) { my @addnodes=expandatom($prefix.$_.$luffix,$verify); @nodes=(@nodes,@addnodes); } return (@nodes); #the return has been built, return, exiting loop and all } } elsif ($leftarr[$idx] ne $rightarr[$idx]) { if ($verify) { push @$missingnodes,$atom; return (); } else { return ($atom); } } $prefix .= $leftarr[$idx]; #If here, it means that the pieces were the same, but more to come } #I cannot conceive how the code could possibly be here, but whatever it is, it must be questionable if ($verify) { push @$missingnodes,$atom; return (); #mismatched range, bail. } else { #Not in verify mode, just have to guess it's meant to be a nodename return ($atom); } } push @$missingnodes,$atom; if ($verify) { return (); } else { return ($atom); } } sub noderange { $missingnodes=[]; #We for now just do left to right operations #TODO: Parentheses... A parenthetical group to the right of an intersection makes the obvious #answer not work my $range=shift; my $verify = (scalar(@_) == 1 ? shift : 1); $nodelist =xCAT::Table->new('nodelist',-create =>1); my %nodes = (); my %delnodes = (); my $op = ","; #my @elems = split(/(,(?![^[]*?])|@)/,$range); #, or @ but ignore , within [] my @elems = split(/(,(?![^[]*?])(?![^\(]*?\))|@(?![^\(]*?\)))/,$range); # comma or @ but ignore comma within [] while (my $atom = shift @elems) { if ($atom =~ /^-/) { # if this is an exclusion, strip off the minus, but remember it $atom = substr($atom,1); $op = $op."-"; } if ($atom =~ /^\^(.*)$/) { # get a list of nodes from a file open(NRF,$1); while (<NRF>) { my $line=$_; unless ($line =~ m/^[\^#]/) { $line =~ m/^([^: ]*)/; my $newrange = $1; chomp($newrange); my @filenodes = noderange($newrange); foreach (@filenodes) { $nodes{$_}=1; } } } close(NRF); next; } my %newset = map { $_ =>1 } expandatom($atom,$verify); # expand the atom and make each entry in the resulting array a key in newset if ($op =~ /@/) { # compute the intersection of the current atom and the node list we have received before this foreach (keys %nodes) { unless ($newset{$_}) { delete $nodes{$_}; } } } elsif ($op =~ /,-/) { # add the nodes from this atom to the exclude list foreach (keys %newset) { $delnodes{$_}=1; #delay removal to end } } else { # add the nodes from this atom to the total node list foreach (keys %newset) { $nodes{$_}=1; } } $op = shift @elems; } # end of main while loop # Now remove all the exclusion nodes foreach (keys %nodes) { if ($delnodes{$_}) { delete $nodes{$_}; } } undef $nodelist; return sort (keys %nodes); } 1; =head1 NAME xCAT::NodeRange - Perl module for xCAT noderange expansion =head1 SYNOPSIS use xCAT::NodeRange; my @nodes=noderange("storage@rack1,node[1-200],^/tmp/nodelist,node300-node400,node401+10,500-550"); =head1 DESCRIPTION noderange interprets xCAT noderange formatted strings and returns a list of xCAT nodelists. The following two operations are supported on elements, and interpreted left to right: , union next element with everything to the left. @ take intersection of element to the right with everything on the left (i.e. mask out anything to the left not belonging to what is described to the right) Each element can be a number of things: A node name, i.e.: =item * node1 A hyphenated node range (only one group of numbers may differ between the left and right hand side, and those numbers will increment in a base 10 fashion): node1-node200 node1-compute-node200-compute node1:node200 node1-compute:node200-compute A noderange denoted by brackets: node[1-200] node[001-200] A regular expression describing the noderange: /d(1.?.?|200) A node plus offset (this increments the first number found in nodename): node1+199 And most of the above substituting groupnames. 3C 3C NodeRange tries to be intelligent about detecting padding, so you can: node001-node200 And it will increment according to the pattern. =head1 AUTHOR Jarrod Johnson (jbjohnso@us.ibm.com) =head1 COPYRIGHT Copyright 2007 IBM Corp. All rights reserved. =cut