Node.pm.in 60.3 KB
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#!/usr/bin/perl -wT
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#
# EMULAB-COPYRIGHT
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# Copyright (c) 2005-2010 University of Utah and the Flux Group.
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# All rights reserved.
#
package Node;
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use strict;
use Exporter;
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use vars qw(@ISA @EXPORT $AUTOLOAD);
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@ISA    = "Exporter";
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@EXPORT = qw();
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# Configure variables
my $TB		= "@prefix@";
my $BOSSNODE    = "@BOSSNODE@";
my $EVENTSYS    = @EVENTSYS@;
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my $WOL         = "$TB/sbin/whol";
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my $OSSELECT    = "$TB/bin/os_select";
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# XXX stinky hack detection
my $ISUTAH	= @TBMAINSITE@;

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# Need this for jail ip assignment.
my $CONTROL_NETMASK = "@CONTROL_NETMASK@";

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use libdb;
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use libtestbed;
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require NodeType;
require Interface;
require Experiment;
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require OSinfo;
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use English;
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use Socket;
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use Data::Dumper;
use overload ('""' => 'Stringify');
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if ($EVENTSYS) {
    require event;
    import event;
}
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use vars qw($NODEROLE_TESTNODE @EXPORT_OK);
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# Exported defs
$NODEROLE_TESTNODE	= 'testnode';

# Why, why, why?
@EXPORT_OK = qw($NODEROLE_TESTNODE);

# Defaults
#
# MFS to boot the nodes into initially
my $MFS_INITIAL = TB_OSID_FREEBSD_MFS();
# Initial event system state to put the nodes into
my $STATE_INITIAL = TBDB_NODESTATE_SHUTDOWN;

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# Cache of instances to avoid regenerating them.
my %nodes	= ();
my $debug	= 0;

# Little helper and debug function.
sub mysystem($)
{
    my ($command) = @_;

    print STDERR "Running '$command'\n"
	if ($debug);
    return system($command);
}
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#
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# Lookup a (physical) node and create a class instance to return.
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#
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sub Lookup($$)
{
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    my ($class, $token) = @_;
    my $nodeid;

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    if ($token =~ /^\w{8}\-\w{4}\-\w{4}\-\w{4}\-\w{12}$/) {
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	my $query_result =
	    DBQueryWarn("select node_id from nodes ".
			"where uuid='$token'");
	    return undef
		if (! $query_result || !$query_result->numrows);

	    ($nodeid) = $query_result->fetchrow_array();
    }
    elsif ($token =~ /^[-\w]+$/) {
	$nodeid = $token;
    }
    else {
	return undef;
    }
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    # Look in cache first
    return $nodes{$nodeid}
        if (exists($nodes{$nodeid}));
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    my $query_result =
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	DBQueryWarn("select * from nodes as n ".
		    "where n.node_id='$nodeid'");
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    return undef
	if (!$query_result || !$query_result->numrows);

    my $self            = {};
    $self->{"DBROW"}    = $query_result->fetchrow_hashref();
    $self->{"RSRV"}     = undef;
    $self->{"TYPEINFO"} = undef;
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    $self->{"ATTRS"}    = undef;
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    $self->{"IFACES"}   = undef;
    $self->{"HASH"}     = {};
    bless($self, $class);

    # Add to cache.
    $nodes{$nodeid} = $self;
    return $self;
}

# Break circular reference someplace to avoid exit errors.
sub DESTROY {
    my $self = shift;

    $self->{"DBROW"}    = undef;
    $self->{"RSRV"}     = undef;
    $self->{"TYPEINFO"} = undef;
    $self->{"ATTRS"}    = undef;
    $self->{"IFACES"}   = undef;
    $self->{"HASH"}     = undef;
}

#
# Create a fake object, as for the mapper (assign_wrapper) during debugging.
#
sub MakeFake($$$$)
{
    my ($class, $nodeid, $dbrow, $rsrvrow) = @_;

    my $self            = {};
    $self->{"DBROW"}    = $dbrow;
    $self->{"RSRV"}     = $rsrvrow;
    $self->{"TYPEINFO"} = undef;
    $self->{"ATTRS"}    = undef;
    $self->{"IFACES"}   = undef;
    $self->{"HASH"}     = {};
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    bless($self, $class);

    # Add to cache.
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    $nodes{$nodeid} = $self;
    return $self;
}
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#
# Bulk lookup of nodes reserved to an experiment. More efficient.
#
sub BulkLookup($$$)
{
    my ($class, $experiment, $pref) = @_;
    my %nodelist = ();
    my $exptidx  = $experiment->idx();

    my $query_result =
	DBQueryWarn("select n.* from reserved as r ".
		    "left join nodes as n on n.node_id=r.node_id ".
		    "where r.exptidx=$exptidx");

    return -1
	if (!defined($query_result));

    while (my $row = $query_result->fetchrow_hashref()) {
	my $nodeid = $row->{'node_id'};
	my $node;

	if (exists($nodes{$nodeid})) {
	    $node = $nodes{$nodeid};
	    $node->{"DBROW"} = $row;
	}
	else {
	    $node               = {};
	    $node->{"DBROW"}    = $row;
	    bless($node, $class);

	    # Add to cache.
	    $nodes{$nodeid} = $node;
	}
	$node->{"RSRV"}     = undef;
	$node->{"TYPEINFO"} = undef;
	$node->{"ATTRS"}    = undef;
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	$node->{"IFACES"}   = undef;
	$node->{"HASH"}     = {};
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	$nodelist{$nodeid} = $node;
    }

    $query_result =
	DBQueryWarn("select r.* from reserved as r ".
		    "where r.exptidx=$exptidx");
    return -1
	if (!defined($query_result));
    
    while (my $row = $query_result->fetchrow_hashref()) {
	my $nodeid = $row->{'node_id'};
	my $node   = $nodelist{$nodeid};

	return -1
	    if (!defined($node));

	$node->{"RSRV"} = $row;
    }

    $query_result =
	DBQueryWarn("select a.* from reserved as r ".
		    "left join node_attributes as a on a.node_id=r.node_id ".
		    "where r.exptidx=$exptidx and a.node_id is not null");
    return -1
	if (!defined($query_result));
    
    while (my $row = $query_result->fetchrow_hashref()) {
	my $nodeid = $row->{'node_id'};
	my $key    = $row->{'attrkey'};
	my $node   = $nodelist{$nodeid};

	return -1
	    if (!defined($node));

	$node->{"ATTRS"}->{$key} = $row;
    }
	
    @$pref = values(%nodelist);
    return 0;
}
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# To avoid writting out all the methods.
sub AUTOLOAD {
    my $self = shift;
    my $type = ref($self) or die("$self is not an object\n");
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    my $name = $AUTOLOAD;
    $name =~ s/.*://;   # strip fully-qualified portion

    if (@_) {
	return $self->{'HASH'}->{$name} = shift;
    }
    elsif (exists($self->{'DBROW'}->{$name})) {
	return $self->{'DBROW'}->{$name};
    }
    elsif (exists($self->{'HASH'}->{$name})) {
	return $self->{'HASH'}->{$name};
    }
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    print STDERR "$self: tried to access unknown slot $name\n";
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    return undef;
}
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#
# Create a new node.
#
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# The list of table we have to clear if anything goes wrong.
my @cleantables = ("nodes", "node_hostkeys", "node_status",
		   "node_activity", "node_utilization",
		   "node_auxtypes", "reserved", "widearea_nodeinfo");

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sub Create($$$$)
{
    my ($class, $node_id, $experiment, $argref) = @_;
    my ($control_iface,$virtnode_capacity,$adminmfs,$adminmfs_osid);
    my ($priority, $osid, $opmode, $state);

    my $type = $argref->{'type'};
    my $role = $argref->{'role'};
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    my $uuid;

    if (exists($argref->{'uuid'})) {
	$uuid = $argref->{'uuid'};
    }
    else {
	$uuid = NewUUID();
	if (!defined($uuid)) {
	    print STDERR "Could not generate a UUID!\n";
	    return undef;
	}
    }
    $uuid = DBQuoteSpecial($uuid);
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    my $typeinfo = NodeType->Lookup($type);
    return undef
	if (!defined($typeinfo));

    my $isremote = $typeinfo->isremotenode();

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    if ($role eq "testnode") {
	if ($typeinfo->virtnode_capacity(\$virtnode_capacity)) {
	    print STDERR "*** No virtnode_capacity for $type! Using zero.\n";
	    $virtnode_capacity = 0;
	}
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	if ($typeinfo->isswitch()) {
	    $osid   = "NULL";
	    $opmode = "ALWAYSUP";
	}
	elsif ($isremote) {
	    $osid   = "NULL";
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	    $opmode = "";

	    if (defined($typeinfo->default_osid())) {
		$osid = $typeinfo->default_osid();
		
		my $osinfo = OSinfo->Lookup($osid);
		if (!defined($osinfo)) {
		    print STDERR
			"*** Could not find OSinfo object for $osid!\n";
		    return undef;
		}
		$osid   = $osinfo->osid();
		$opmode = $osinfo->op_mode();
	    }
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	}
	else {
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	    if ($typeinfo->adminmfs_osid(\$adminmfs_osid)) {
		print STDERR "*** No adminmfs osid for $type!\n";
		return undef;
	    }
	    # Find object for the adminfs.
	    if (defined($adminmfs_osid)) {
		$adminmfs = OSinfo->Lookup($adminmfs_osid);
	    }
	    else {
		$adminmfs = OSinfo->Lookup(TBOPSPID(), $MFS_INITIAL);
	    }
	    if (!defined($adminmfs)) {
		print STDERR
		    "*** Could not find OSinfo object for adminmfs!\n";
		return undef;
	    }
	    $osid   = $adminmfs->osid();
	    $opmode = $adminmfs->op_mode();
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	}
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    }
    else {
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	$osid   = "NULL";
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	$opmode = "";
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    }
    $state  = $STATE_INITIAL;
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    #
    # Lock the tables to prevent concurrent creation
    #
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    DBQueryWarn("lock tables nodes write, widearea_nodeinfo write, ".
		"node_hostkeys write, node_status write, ".
		"node_utilization write, ".
		"node_activity write, reserved write, node_auxtypes write")
	or return undef;
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    #
    # Make up a priority (just used for sorting)
    #
    if ($node_id =~ /^(.*\D)(\d+)$/) {
	$priority = $2;
    }
    else {
	$priority = 1;
    }
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    #
    # See if we have a record; if we do, we can stop now and get the
    # existing record.
    #
    my $query_result =
	DBQueryWarn("select node_id from nodes where node_id='$node_id'");
    if ($query_result->numrows) {
	DBQueryWarn("unlock tables");
	return Node->Lookup($node_id);
    }

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    if (!DBQueryWarn("insert into nodes set ".
		     "  node_id='$node_id', type='$type', " .
		     "  phys_nodeid='$node_id', role='$role', ".
		     "  priority=$priority, " .
		     "  eventstate='$state', op_mode='$opmode', " .
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		     "  def_boot_osid=$osid, " .
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		     "  inception=now(), uuid=$uuid, ".
		     "  state_timestamp=unix_timestamp(NOW()), " .
		     "  op_mode_timestamp=unix_timestamp(NOW())")) {
	DBQueryWarn("unlock tables");
	return undef;
    }
    if ($isremote) {
	my $hostname = $argref->{'hostname'};
	my $external = $argref->{'external_node_id'};
	my $IP       = $argref->{'IP'};
	    
	if (!DBQueryWarn("replace into widearea_nodeinfo ".
			 " (node_id, contact_uid, contact_idx, hostname," .
			 "  external_node_id, IP) ".
			 " values ('$node_id', 'nobody', '0', ".
			 "         '$hostname', '$external', '$IP')")) {
	    DBQueryWarn("delete from nodes where node_id='$node_id'");
	    DBQueryWarn("unlock tables");
	    return undef;
	}
    }
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    if ($role eq "testnode") {
	DBQueryWarn("insert into node_hostkeys (node_id) ".
		    "values ('$node_id')")
	    or goto bad;
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	DBQueryWarn("insert into node_status ".
		    "(node_id, status, status_timestamp) ".
		    "values ('$node_id', 'down', now()) ")
	    or goto bad;
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	DBQueryWarn("insert into node_activity ".
		    "(node_id) values ('$node_id')")
	    or goto bad;
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	DBQueryWarn("insert into node_utilization ".
		    "(node_id) values ('$node_id')")
	    or goto bad;
    }
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    if (defined($experiment)) {
	my $exptidx = $experiment->idx();
	my $pid     = $experiment->pid();
	my $eid     = $experiment->eid();

	# Reserve node to hold it from being messed with.
	print STDERR
	    "*** Reserving new node $node_id to $pid/$eid\n";

	DBQueryWarn("insert into reserved ".
		    "(node_id, exptidx, pid, eid, rsrv_time, vname) ".
		    "values ('$node_id', $exptidx, ".
		    "        '$pid', '$eid', now(), '$node_id')")
	    or goto bad;
    }

    #
    # Add vnode counts.
    #
    if ($role eq $Node::NODEROLE_TESTNODE && $virtnode_capacity) {
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	my $vtype;
	
	if (exists($argref->{'vtype'})) {
	    $vtype = $argref->{'vtype'};
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	}
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	else  {
	    $vtype = $type;
	    if (!($vtype =~ s/pc/pcvm/)) {
		$vtype = "$vtype-vm";
	    }
	}
	
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	DBQueryWarn("insert into node_auxtypes set node_id='$node_id', " .
		    "type='$vtype', count=$virtnode_capacity")
	    or goto bad;
    }
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    DBQueryWarn("unlock tables");
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    return Node->Lookup($node_id);
    
  bad:
    foreach my $table (@cleantables) {
	DBQueryWarn("delete from $table where node_id='$node_id'");
    }
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    DBQueryWarn("unlock tables");
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    return undef;
}

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#
# Only use this for Create() errors.
#
sub Delete($)
{
    my ($self)  = @_;
    my $node_id = $self->node_id();

    foreach my $table (@cleantables) {
	DBQueryWarn("delete from $table where node_id='$node_id'");
    }
    return 0;
}

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#
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# Refresh a class instance by reloading from the DB.
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#
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sub Refresh($)
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{
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    my ($self) = @_;

    return -1
	if (! ref($self));
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    my $nodeid = $self->node_id();
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    my $query_result =
	DBQueryWarn("select * from nodes as n ".
		    "where n.node_id='$nodeid'");

    return -1
	if (!$query_result || !$query_result->numrows);

    $self->{"DBROW"}  = $query_result->fetchrow_hashref();
    # Force reload
    $self->{"RSRV"}     = undef;
    $self->{"TYPEINFO"} = undef;
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    $self->{"ATTRS"}    = undef;
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    $self->{"IFACES"}   = undef;
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    return 0;
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}

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#
# Flush from our little cache, as for the expire daemon.
#
sub Flush($)
{
    my ($self) = @_;

    delete($nodes{$self->node_id()});
}
sub FlushAll($)
{
    my ($class) = @_;
    
    %nodes = ();
}

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#
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# Stringify for output.
#
sub Stringify($)
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{
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    my ($self) = @_;
    
    my $nodeid = $self->node_id();
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    return "[Node: $nodeid]";
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}

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#
# Check permissions. Allow for either uid or a user ref until all code
# updated.
#
sub AccessCheck($$$)
{
    my ($self, $user, $access_type) = @_;

    # Must be a real reference. 
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    return 0
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	if (! ref($self));

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    if ($access_type < TB_NODEACCESS_MIN ||
	$access_type > TB_NODEACCESS_MAX) {
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	print STDERR "*** Invalid access type: $access_type!\n";
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	return 0;
    }
    # Admins do whatever they want.
    return 1
	if ($user->IsAdmin());

    my $mintrust;

    if ($access_type == TB_NODEACCESS_READINFO) {
	$mintrust = PROJMEMBERTRUST_USER;
    }
    else {
	$mintrust = PROJMEMBERTRUST_LOCALROOT;
    }

    # Get the reservation for this node. Only admins can mess with free nodes.
    my $experiment = $self->Reservation();
    return 0
	if (!defined($experiment));
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    my $group = $experiment->GetGroup();
    return 0
	if (!defined($group));
    my $project = $experiment->GetProject();
    return 0
	if (!defined($project));

    #
    # Either proper permission in the group, or group_root in the
    # project. This lets group_roots muck with other people's
    # nodes, including those in groups they do not belong to.
    #
    return TBMinTrust($group->Trust($user), $mintrust) ||
	TBMinTrust($project->Trust($user), PROJMEMBERTRUST_GROUPROOT);
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}

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#
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# Lazily load the reservation info.
#
sub IsReserved($)
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{
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    my ($self) = @_;
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    return 0
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	if (! ref($self));
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    if (! defined($self->{"RSRV"})) {
	my $nodeid = $self->node_id();
	
	my $query_result =
	    DBQueryWarn("select * from reserved " .
			"where node_id='$nodeid'");
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	return 0
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	    if (!$query_result);
	return 0
	    if (!$query_result->numrows);

	$self->{"RSRV"} = $query_result->fetchrow_hashref();
	return 1;
    }
    return 1;
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}

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sub GetSubboss($$)
{
    my ($self, $service, $subboss_id) = @_;

    return 0
	if (! ref($self));

    my $ref;

    if (defined $self->{"SUBBOSSES"}) {
	my $ref = $self->{"SUBBOSSES"}->{$service};
    }

    if (!defined $ref) {
	my $nodeid = $self->node_id();

	my $query_result =
	    DBQueryWarn("select * from subbosses " .
			"where node_id='$nodeid' and " .
			"service = '$service'");

	return 0
	    if (!$query_result);
	return 0
	    if (!$query_result->numrows);

	if (!defined($self->{"SUBBOSSES"})) {
	    $self->{"SUBBOSSES"} = {};
	}

	$ref = $self->{"SUBBOSSES"}->{$service} =
	    $query_result->fetchrow_hashref();
    }

    $$subboss_id = $ref->{'subboss_id'};

    return 0;
}

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#
# Flush the reserve info so it reloads.
#
sub FlushReserved($)
{
    my ($self) = @_;

    $self->{"RSRV"} = undef;
    return 0;
}

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#
# Is node up.
#
sub IsUp($)
{
    my ($self) = @_;

    return 0
	if (! ref($self));

    return $self->eventstate() eq TBDB_NODESTATE_ISUP;
}

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#
# Determine if a node can be allocated to a project.
#
sub NodeAllocCheck($$)
{
    my ($self, $pid) = @_;

    # Must be a real reference. 
    return 0
	if (! ref($self));

    my $node_id = $self->node_id();

    #
    # Hmm. The point of this join is to find rows in the permissions table
    # with the corresponding type of the node. If no rows come back, its
    # a non-existent node! If the values are NULL, then there are no rows
    # with that type/class, and thus the type/class is free to be allocated
    # by anyone. Otherwise we get the list of projects that are allowed,
    # and so we have to look at those.
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    # Note: nodetypeXpid_permissions has the pid_idx in addition to the pid -
    # presumably, the Right Thing would be to use that, but this function
    # is only passed the pid right now.
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    #
    my $query_result =
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	DBQueryFatal("select distinct p.type, p.pid_idx from nodes as n ".
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		     "left join node_types as nt on n.type=nt.type ".
		     "left join nodetypeXpid_permissions as p on ".
		     "     (p.type=nt.type or p.type=nt.class) ".
		     "where node_id='$node_id'");

    if (!$query_result->numrows) {
	print STDERR "NodeAllocCheck: No such node $node_id!\n";
	return 0;
    }
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    my ($ptype,$pid_idx) = $query_result->fetchrow_array();
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    # No rows, or a pid match.
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    if (!defined($ptype) || $pid_idx eq $pid->pid_idx()) {
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	return 1;
    }

    # Okay, must be rows in the permissions table. Check each pid for a match.
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    while (my ($ptype,$pid_idx) = $query_result->fetchrow_array()) {
	if ($pid_idx eq $pid->pid_idx()) {
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	    return 1;
	}
    }
    return 0;
}

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# Naming confusion.
sub AllocCheck($$)
{
    my ($self, $pid) = @_;

    return $self->NodeAllocCheck($pid);
}

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#
# Set alloc state for a node.
#
sub SetAllocState($$)
{
    my ($self, $state) = @_;

    return -1
	if (! (ref($self)));
    
    my $now = time();
    my $node_id = $self->node_id();
    
    DBQueryWarn("update nodes set allocstate='$state', " .
		"    allocstate_timestamp=$now where node_id='$node_id'")
	or return -1;

    return Refresh($self);
}

#
# Get alloc state for a node.
#
sub GetAllocState($$)
{
    my ($self, $pref) = @_;

    return -1
	if (! (ref($self) && ref($pref)));
    
    my $allocstate = $self->allocstate();
    
    if (defined($allocstate)) {
	$$pref = $allocstate;
    }
    else {
	$$pref = TBDB_ALLOCSTATE_UNKNOWN;
    }
    return 0;
}

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#
# We do this cause we always want to go to the DB.
#
sub GetEventState($$)
{
    my ($self, $pstate) = @_;
    my $node_id = $self->node_id();

    my $query_result =
	DBQueryWarn("select eventstate from nodes where node_id='$node_id'");
    return -1
	if (!$query_result || !$query_result->numrows);

    my ($state) = $query_result->fetchrow_array();
    $state = TBDB_NODESTATE_UNKNOWN
	if (!defined($state));

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    $self->{'DBROW'}->{'eventstate'} = $state
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	if (defined($self->{'DBROW'}));
    $$pstate = $state;
    return 0;
}

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#
# Equality test for two experiments.
# Not strictly necessary in perl, but good form.
#
sub SameExperiment($$)
{
    my ($self, $other) = @_;

    # Must be a real reference. 
    return -1
	if (! (ref($self) && ref($other)));

    return $self->idx() == $other->idx();
}

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#
# Get the experiment this node is reserved too, or null.
#
sub Reservation($)
{
    my ($self) = @_;

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    return undef
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	if (! ref($self));

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    return undef
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	if (! $self->IsReserved());

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    return Experiment->Lookup($self->{"RSRV"}->{'exptidx'});
}

#
# Return just the ID of the reservation experiment. Avoids locking problems
# within nalloc and nfree. 
#
sub ReservationID($)
{
    my ($self) = @_;

    return undef
	if (! ref($self));

    return undef
	if (! $self->IsReserved());

    return $self->{"RSRV"}->{'exptidx'};
}

#
# Get the NEXT experiment this node is reserved too, or null.
#
sub NextReservation($)
{
    my ($self) = @_;

    return undef
	if (! ref($self));

    my $node_id = $self->node_id();
    
    my $query_result =
	DBQueryFatal("select pid,eid from next_reserve ".
		     "where node_id='$node_id'");

    return undef
	if (!$query_result || !$query_result->numrows);

    my ($pid,$eid) = $query_result->fetchrow_array();

    return Experiment->Lookup($pid, $eid);
}

#
# Move a node from its experiment to another. Must treat oldreserved special.
#
sub MoveReservation($$)
{
    my ($self, $newexperiment) = @_;
    
    return -1
	if (! (ref($self) && ref($newexperiment)));

    my $node_id    = $self->node_id();
    my $newpid     = $newexperiment->pid();
    my $neweid     = $newexperiment->eid();
    my $newidx     = $newexperiment->idx();
    my $oldpid     = "";
    my $oldeid     = "";
    my $oldidx     = 0;
    
    # Must remember old reservation when moving to new oldreserved.
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    if ($newpid eq OLDRESERVED_PID() && $neweid eq OLDRESERVED_EID()) {	
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        #
	# Cannot do an experiment Lookup cause reserved table may be locked.
	# IsReserved() will load the reserved table entry only.
	#
	return -1
	    if (!$self->IsReserved());
	
	$oldpid     = $self->{"RSRV"}->{'pid'};
	$oldeid     = $self->{"RSRV"}->{'eid'};
	$oldidx     = $self->{"RSRV"}->{'exptidx'};
    }
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    my $sets = "rsrv_time=now(), ".
	" vname='$node_id', ".
	" exptidx=$newidx, ".
	" pid='$newpid', ".
	" eid='$neweid', ".
	" old_exptidx=$oldidx, ".
	" old_pid='$oldpid', ".
	" old_eid='$oldeid' ";

    if ($self->IsReserved()) {
	DBQueryWarn("update reserved set $sets where node_id='$node_id'")
	    or return -1;
    }
    else {
	DBQueryWarn("insert into reserved set $sets, node_id='$node_id'")
	    or return -1;
    }
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    # Force this to reload.
    $self->{"RSRV"} = undef;
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    return 0;
}

#
# Change reservation table for a node.
#
sub ModifyReservation($$)
{
    my ($self, $argref) = @_;
    
    return -1
	if (! (ref($self) && ref($argref)));

    return -1
	if (! $self->IsReserved());
    
    my $node_id = $self->node_id();
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    my @sets    = ();
    foreach my $key (keys(%{$argref})) {
	my $val = $argref->{$key};
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	push(@sets, "$key=" . ("$val" eq "NULL" ? "NULL" : "'$val'"));
    }
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    my $query = "update reserved set ".	join(",", @sets);
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    $query .= " where node_id='$node_id'";

    return -1
	if (! DBQueryWarn($query));

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    foreach my $key (keys(%{$argref})) {
	my $val = $argref->{$key};
	
	$self->{'DBROW'}->{$key} = $val;
    }
    return 0;
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}

#
# Map nodeid to its pid/eid in the oldreserved holding reservation
#
sub OldReservation($)
{
    my ($self) = @_;

    return undef
	if (! ref($self));

    my $nodeid          = $self->node_id();
    my $oldreserved_pid = OLDRESERVED_PID;
    my $oldreserved_eid = OLDRESERVED_EID;
    
    my $query_result =
	DBQueryWarn("select old_pid,old_eid from reserved ".
		    "where node_id='$nodeid' and pid='$oldreserved_pid' ".
		    "and eid='$oldreserved_eid'");

    return undef
	if (! $query_result || !$query_result->num_rows);

    my ($pid,$eid) = $query_result->fetchrow_array();
    
    return Experiment->Lookup($pid, $eid);
}

sub OldReservationID($)
{
    my ($self) = @_;

    return undef
	if (! ref($self));

    my $nodeid          = $self->node_id();
    my $oldreserved_pid = OLDRESERVED_PID;
    my $oldreserved_eid = OLDRESERVED_EID;
    
    my $query_result =
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