Experiment.pm.in 67.8 KB
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#!/usr/bin/perl -wT
#
# EMULAB-COPYRIGHT
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# Copyright (c) 2005, 2006, 2007 University of Utah and the Flux Group.
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# All rights reserved.
#
package Experiment;

use strict;
use Exporter;
use vars qw(@ISA @EXPORT);

@ISA    = "Exporter";
@EXPORT = qw ( );

# Must come after package declaration!
use lib '@prefix@/lib';
use libdb;
use libtestbed;
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use User;
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use Project;
use Group;
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use Node;
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use English;
use Data::Dumper;
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use File::Basename;
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use overload ('""' => 'Stringify');
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use libtblog_simple;
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use vars qw($EXPT_PRELOAD $EXPT_START $EXPT_SWAPIN
	    $EXPT_SWAPOUT $EXPT_SWAPMOD
	    @EXPORT_OK);

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# Configure variables
my $TB		= "@prefix@";
my $BOSSNODE    = "@BOSSNODE@";
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my $CONTROL	= "@USERNODE@";
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my $TBOPS       = "@TBOPSEMAIL@";
my $PROJROOT    = "@PROJROOT_DIR@";
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my $EVENTSYS    = @EVENTSYS@;
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my $STAMPS      = @STAMPS@;
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my $TEVC	= "$TB/bin/tevc";
my $DBCONTROL   = "$TB/sbin/opsdb_control";
my $RSYNC	= "/usr/local/bin/rsync";
my $MKEXPDIR    = "$TB/libexec/mkexpdir";
my $TBPRERUN    = "$TB/bin/tbprerun";
my $TBSWAP      = "$TB/bin/tbswap";
my $TBREPORT    = "$TB/bin/tbreport";
my $TBEND       = "$TB/bin/tbend";
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my $DU          = "/usr/bin/du";
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my $MD5         = "/sbin/md5";
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# Swap Actions
$EXPT_PRELOAD		= TBDB_STATS_PRELOAD();
$EXPT_START		= TBDB_STATS_START();
$EXPT_SWAPIN		= TBDB_STATS_SWAPIN();
$EXPT_SWAPOUT		= TBDB_STATS_SWAPOUT();
$EXPT_SWAPMOD		= TBDB_STATS_SWAPMODIFY();

# For stats gathering code.
my $EXPT_STARTCLOCK;
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my $EXPT_RESOURCESHOSED = 0;
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# Why, why, why?
@EXPORT_OK = qw($EXPT_PRELOAD $EXPT_START
		$EXPT_SWAPIN $EXPT_SWAPOUT $EXPT_SWAPMOD);

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# Hmm, this is silly. 
if ($EVENTSYS) {
    require event;
    import event;
}

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

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

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    my $cwd;
    chomp($cwd = `pwd`);

    print STDERR "Running '$command' in $cwd\n"
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	if ($debug);
    return system($command);
}

#
# Lookup an experiment and create a class instance to return.
#
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sub Lookup($$;$)
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{
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    my ($class, $arg1, $arg2) = @_;
    my $idx;

    #
    # A single arg is either an index or a "pid,eid" or "pid/eid" string.
    #
    if (!defined($arg2)) {
	if ($arg1 =~ /^(\d*)$/) {
	    $idx = $1;
	}
	elsif ($arg1 =~ /^([-\w]*),([-\w]*)$/ ||
	       $arg1 =~ /^([-\w]*)\/([-\w]*)$/) {
	    $arg1 = $1;
	    $arg2 = $2;
	}
	else {
	    return undef;
	}
    }
    elsif (! (($arg1 =~ /^[-\w]*$/) && ($arg2 =~ /^[-\w]*$/))) {
	return undef;
    }

    #
    # Two args means lookup by pid,eid instead of exptidx.
    #
    if (defined($arg2)) {
	my $result =
	    DBQueryWarn("select idx from experiments ".
			"where pid='$arg1' and eid='$arg2'");

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

	($idx) = $result->fetchrow_array();
    }
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    # Look in cache first
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    return $experiments{"$idx"}
        if (exists($experiments{"$idx"}));
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    my $query_result =
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	DBQueryWarn("select e.*,i.parent_guid,t.guid from experiments as e ".
		    "left join experiment_templates as t on ".
		    "     t.exptidx=e.idx ".
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		    "left join experiment_template_instances as i on ".
		    "     i.exptidx=e.idx ".
		    "where e.idx='$idx'");
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    return undef
	if (!$query_result || !$query_result->numrows);

    my $self         = {};
    $self->{'EXPT'}  = $query_result->fetchrow_hashref();
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    # An Instance?
    $self->{'ISINSTANCE'} = defined($self->{'EXPT'}->{'parent_guid'});
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    # The experiment underlying a template.
    $self->{'ISTEMPLATE'} = defined($self->{'EXPT'}->{'guid'});
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    $query_result =
	DBQueryWarn("select * from experiment_stats where exptidx='$idx'");
	
    return undef
	if (!$query_result || !$query_result->numrows);
    
    $self->{'STATS'} = $query_result->fetchrow_hashref();
    
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    my $rsrcidx = $self->{'STATS'}->{'rsrcidx'};

    $query_result =
	DBQueryWarn("select * from experiment_resources ".
		    "where idx='$rsrcidx'");
	
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    return undef
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	if (!$query_result || !$query_result->numrows);
    
    $self->{'RSRC'} = $query_result->fetchrow_hashref();
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    bless($self, $class);
    
    # Add to cache. 
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    $experiments{"$idx"} = $self;
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    return $self;
}
# accessors
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sub field($$)     { return ((! ref($_[0])) ? -1 : $_[0]->{'EXPT'}->{$_[1]}); }
sub stats($$)     { return ((! ref($_[0])) ? -1 : $_[0]->{'STATS'}->{$_[1]});}
sub resources($$) { return ((! ref($_[0])) ? -1 : $_[0]->{'RSRC'}->{$_[1]}); }
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sub pid($)		{ return field($_[0], 'pid'); }
sub gid($)		{ return field($_[0], 'gid'); }
sub pid_idx($)		{ return field($_[0], 'pid_idx'); }
sub gid_idx($)		{ return field($_[0], 'gid_idx'); }
sub eid($)		{ return field($_[0], 'eid'); }
sub idx($)		{ return field($_[0], 'idx'); }
sub path($)		{ return field($_[0], 'path'); }
sub state($)		{ return field($_[0], 'state'); }
sub batchstate($)	{ return field($_[0], 'batchstate'); }
sub batchmode($)	{ return field($_[0], 'batchmode'); }
sub rsrcidx($)		{ return stats($_[0], 'rsrcidx'); }
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sub lastrsrc($)		{ return stats($_[0], 'lastrsrc'); }
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sub creator($)		{ return field($_[0], 'expt_head_uid');}
sub canceled($)		{ return field($_[0], 'canceled'); }
sub locked($)		{ return field($_[0], 'expt_locked'); }
sub elabinelab($)	{ return field($_[0], 'elab_in_elab');}
sub elabinelab_eid($)   { return field($_[0], 'elabinelab_eid');}
sub elabinelab_exptidx($){return field($_[0], 'elabinelab_exptidx');}
sub lockdown($)		{ return field($_[0], 'lockdown'); }
sub created($)		{ return field($_[0], 'expt_created'); }
sub swapper($)		{ return field($_[0], 'expt_swap_uid');}
sub swappable($)	{ return field($_[0], 'swappable');}
sub idleswap($)		{ return field($_[0], 'idleswap');}
sub autoswap($)		{ return field($_[0], 'autoswap');}
sub noswap_reason($)	{ return field($_[0], 'noswap_reason');}
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sub noidleswap_reason($){ return field($_[0], 'noidleswap_reason');}
sub idleswap_timeout($) { return field($_[0], 'idleswap_timeout');}
sub autoswap_timeout($) { return field($_[0], 'autoswap_timeout');}
sub prerender_pid($)    { return field($_[0], 'prerender_pid');}
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sub dpdb($)		{ return field($_[0], 'dpdb');}
sub dpdbname($)         { return field($_[0], 'dpdbname');}
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sub dpdbpassword($)     { return field($_[0], 'dpdbpassword');}
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sub instance_idx($)     { return field($_[0], 'instance_idx'); }
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sub creator_idx($)      { return field($_[0], 'creator_idx');}
sub swapper_idx($)      { return field($_[0], 'swapper_idx');}
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sub use_ipassign($)     { return field($_[0], 'use_ipassign');}
sub ipassign_args($)    { return field($_[0], 'ipassign_args');}
sub security_level($)   { return field($_[0], 'security_level');}
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sub linktest_pid($)     { return field($_[0], 'linktest_pid');}
sub linktest_level($)   { return field($_[0], 'linktest_level');}
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sub archive_idx($)	{ return stats($_[0], 'archive_idx'); }
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sub swapin_count($)	{ return stats($_[0], 'swapin_count'); }
sub destroyed($)	{ return stats($_[0], 'destroyed'); }
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sub archive_tag($)	{ return resources($_[0], 'archive_tag'); }
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sub thumbnail($)	{ return resources($_[0], 'thumbnail'); }
sub swapin_time($)	{ return resources($_[0], 'swapin_time'); }
sub swapout_time($)	{ return resources($_[0], 'swapout_time'); }
sub lastidx($)	        { return resources($_[0], 'lastidx'); }
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sub input_data_idx($)   { return resources($_[0], 'input_data_idx'); }
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#
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# Lookup an experiment given an experiment index.
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#
sub LookupByIndex($$)
{
    my ($class, $exptidx) = @_;

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    return Experiment->Lookup($exptidx);
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}

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#
# All active experiments.
#
sub AllActive($)
{
    my ($class) = @_;
    my @result  = ();
    
    my $query_result =
	DBQueryFatal("select idx from experiments where state='active'");

    while (my ($idx) = $query_result->fetchrow_array()) {
	my $experiment = Experiment->Lookup($idx);

	if (!defined($experiment)) {
	    print STDERR "Experiment::AllActive: No object for $idx!\n";
	}
	push(@result, $experiment);
    }
    return @result;
}

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#
# All experiments for a particular user. Class method.
#
sub UserExperimentList($$$)
{
    my ($class, $user, $plist) = @_;
    my @result  = ();
    my $uid_idx = $user->uid_idx();
    
    my $query_result =
	DBQueryWarn("select idx from experiments ".
		    "where creator_idx='$uid_idx' or swapper_idx='$uid_idx'");
    return -1
	if (! $query_result);

    while (my ($idx) = $query_result->fetchrow_array()) {
	my $experiment = Experiment->Lookup($idx);

	if (!defined($experiment)) {
	    print STDERR "Experiment::UserExperimentList: ".
		"No object for $idx!\n";
	    return -1;
	}
	push(@result, $experiment);
    }
    @$plist = @result;
    return 0;
}

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# This is needed a lot.
sub unix_gid($)
{
    my ($self) = @_;

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

    my $group = $self->GetGroup();
    return -1
	if (!defined($group));

    return $group->unix_gid();
}

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#
# LockTables simple locks the given tables, and then refreshes the
# experiment instance (thereby getting the data from the DB after
# the tables are locked).
#
sub LockTables($;$)
{
    my ($self, $spec) = @_;

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

    $spec  = "experiments write"
	if (!defined($spec));
    $spec .= ", experiment_stats read";
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    $spec .= ", experiment_resources read";
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    DBQueryWarn("lock tables $spec")
	or return -1;
	
    return $self->Refresh();
}
sub UnLockTables($)
{
    my ($self) = @_;

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

    DBQueryWarn("unlock tables")
	or return -1;
    return 0;
}

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#
# Create a new experiment. This installs the new record in the DB,
# and returns an instance. There is some bookkeeping along the way.
#
sub Create($$$$)
{
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    my ($class, $group, $eid, $argref) = @_;
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    my $exptidx;
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    my $now = time();
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    return undef
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	if (ref($class) || !ref($group));

    my $pid     = $group->pid();
    my $gid     = $group->gid();
    my $pid_idx = $group->pid_idx();
    my $gid_idx = $group->gid_idx();
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    #
    # The pid/eid has to be unique, so lock the table for the check/insert.
    #
    DBQueryWarn("lock tables experiments write, ".
		"            experiment_stats write, ".
		"            experiment_resources write, ".
		"            emulab_indicies write, ".
		"            testbed_stats read")
	or return undef;

    my $query_result =
	DBQueryWarn("select pid,eid from experiments ".
		    "where eid='$eid' and pid='$pid'");

    if ($query_result->numrows) {
	DBQueryWarn("unlock tables");
	tberror("Experiment $eid in project $pid already exists!");
	return undef;
    }

    #
    # Grab the next highest index to use. We used to use an auto_increment
    # field in the table, but if the DB is ever "dropped" and recreated,
    # it will reuse indicies that are crossed referenced in the other two
    # tables.
    #
    $query_result = 
	DBQueryWarn("select idx from emulab_indicies ".
		    "where name='next_exptidx'");

    if (!$query_result) {
	DBQueryWarn("unlock tables");
	return undef;
    }

    # Seed with a proper value.
    if (! $query_result->num_rows) {
	$query_result =
	    DBQueryWarn("select MAX(exptidx) + 1 from experiment_stats");

	if (!$query_result) {
	    DBQueryWarn("unlock tables");
	    return undef;
	}
	($exptidx) = $query_result->fetchrow_array();

	# First ever experiment!
	$exptidx = 1
	    if (!defined($exptidx));

	if (! DBQueryWarn("insert into emulab_indicies (name, idx) ".
			  "values ('next_exptidx', $exptidx)")) {
	    DBQueryWarn("unlock tables");
	    return undef;
	}

    }
    else {
	($exptidx) = $query_result->fetchrow_array();
    }
    my $nextidx = $exptidx + 1;
    
    if (! DBQueryWarn("update emulab_indicies set idx='$nextidx' ".
		      "where name='next_exptidx'")) {
	DBQueryWarn("unlock tables");
	return undef;
    }

    #
    # Lets be really sure!
    #
    foreach my $table ("experiments", "experiment_stats",
		       "experiment_resources", "testbed_stats") {

	my $slot = (($table eq "experiments") ? "idx" : "exptidx");
	
	$query_result =
	    DBQueryWarn("select * from $table where ${slot}=$exptidx");

	if (! $query_result) {
	    DBQueryWarn("unlock tables");
	    return undef;
	}
	if ($query_result->numrows) {
	    DBQueryWarn("unlock tables");
	    tberror("Experiment index $exptidx exists in $table; ".
		    "this is bad!");
	    return undef;
	}
    }

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    # And a UUID (universally unique identifier).
    my $uuid = NewUUID();
    if (!defined($uuid)) {
	print "*** WARNING: Could not generate a UUID!\n";
	return undef;
    }

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    #
    # Insert the record. This reserves the pid/eid for us. 
    #
    # Some fields special cause of quoting.
    #
    my $description = DBQuoteSpecial($argref->{'expt_name'});
    delete($argref->{'expt_name'});
    my $noswap_reason = DBQuoteSpecial($argref->{'noswap_reason'});
    delete($argref->{'noswap_reason'});
    my $noidleswap_reason = DBQuoteSpecial($argref->{'noidleswap_reason'});
    delete($argref->{'noidleswap_reason'});

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    # we override this below
    delete($argref->{'idx'})
	if (exists($argref->{'idx'}));

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    my $query = "insert into experiments set ".
	join(",", map("$_='" . $argref->{$_} . "'", keys(%{$argref})));

    # Append the rest
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    $query .= ",expt_created=FROM_UNIXTIME('$now')";
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    $query .= ",expt_locked=now(),pid='$pid',eid='$eid',eid_uuid='$uuid'";
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    $query .= ",pid_idx='$pid_idx',gid='$gid',gid_idx='$gid_idx'";
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    $query .= ",expt_name=$description";
    $query .= ",noswap_reason=$noswap_reason";
    $query .= ",noidleswap_reason=$noidleswap_reason";
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    $query .= ",idx=$exptidx";
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    if (! DBQueryWarn($query)) {
	DBQueryWarn("unlock tables");
	tberror("Error inserting experiment record for $pid/$eid!");	
	return undef;
    }

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    my $creator_uid = $argref->{'expt_head_uid'};
    my $creator_idx = $argref->{'creator_idx'};
    my $batchmode   = $argref->{'batchmode'};

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    #
    # Create an experiment_resources record for the above record.
    #
    $query_result =
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	DBQueryWarn("insert into experiment_resources ".
		    "(tstamp, exptidx, uid_idx) ".
		    "values (FROM_UNIXTIME('$now'), $exptidx, $creator_idx)");
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    if (!$query_result) {
	DBQueryWarn("delete from experiments where pid='$pid' and eid='$eid'");
	DBQueryWarn("unlock tables");
	tberror("Error inserting experiment resources record for $pid/$eid!");
	return undef;
    }
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    my $rsrcidx     = $query_result->insertid;
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    #
    # Now create an experiment_stats record to match.
    #
    if (! DBQueryWarn("insert into experiment_stats ".
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		      "(eid, pid, creator, creator_idx, gid, created, ".
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		      " batch, exptidx, rsrcidx, pid_idx, gid_idx, eid_uuid) ".
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		      "values('$eid', '$pid', '$creator_uid', '$creator_idx',".
		      "       '$gid', FROM_UNIXTIME('$now'), ".
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		      "        $batchmode, $exptidx, $rsrcidx, ".
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		      "        $pid_idx, $gid_idx, '$uuid')")) {
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	DBQueryWarn("delete from experiments where pid='$pid' and eid='$eid'");
	DBQueryWarn("delete from experiment_resources where idx=$rsrcidx");
	DBQueryWarn("unlock tables");
	tberror("Error inserting experiment stats record for $pid/$eid!");
	return undef;
    }

    #
    # Safe to unlock; all tables consistent.
    #
    if (! DBQueryWarn("unlock tables")) {
	DBQueryWarn("delete from experiments where pid='$pid' and eid='$eid'");
	DBQueryWarn("delete from experiment_resources where idx=$rsrcidx");
	DBQueryWarn("delete from experiment_stats where exptidx=$exptidx");
	tberror("Error unlocking tables!");
	return undef
    }

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

#
# Delete experiment. Optional purge argument says to remove all trace
# (typically, the stats are kept).
#
sub Delete($;$)
{
    my ($self, $purge) = @_;

    return -1
	if (! ref($self));

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    my $pid     = $self->pid();
    my $eid     = $self->eid();
    my $exptidx = $self->idx();
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    my $workdir = $self->WorkDir();
    my $userdir = $self->UserDir();
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    $purge = 0
	if (!defined($purge));

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    #
    # Try to remove experiment directory. We allow for it not being there
    # cause we often run the tb programs directly. We also allow for not
    # having permission, in the case that an admin type is running this,
    # in which case it won't be allowed cause of directory permissions. Thats
    # okay since admin types should rarely end experiments in other projects.
    #
    print "Removing experiment directories ... \n";
    if (defined($userdir) && system("/bin/rm -rf $userdir")) {
	print "*** WARNING: Not able to remove $userdir\n";
	print "             Someone will need to do this by hand.\n";
	# NFS errors usually the result. Sometimes its cause there is
	# someone in the directory, so its being held open.
        libtestbed::SENDMAIL($TBOPS,
			     "Experiment::Delete: Could not remove directory",
			     "Could not remove $userdir.\n".
			     "Someone will need to do this by hand.\n");
    }
    if (system("/bin/rm -rf $workdir")) {
	print "*** WARNING: Not able to remove $workdir\n";
	print "             Someone will need to do this by hand.\n";
    }
    # Yuck.
    if ($pid ne $self->gid()) {
	my $eidlink = "$PROJROOT/$pid/exp/$eid";
	unlink($eidlink)
	    if (-l $eidlink);
    }
    libArchive::TBDeleteExperimentArchive($pid, $eid);

    DBQueryWarn("DELETE from experiments ".
		"WHERE eid='$eid' and pid='$pid'");
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    #
    # Mark experiment destroyed. This is a backup to End() below.
    #
    if (! defined($self->destroyed())) {
	DBQueryWarn("update experiment_stats set ".
		    "   destroyed=now() ".
		    "where exptidx=$exptidx");
	$self->Refresh();
    }
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    return 0
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	if (! $purge);
    
    #
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    # Now we can clean up the stats and resource records. 
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    #
    my $rsrcidx = $self->rsrcidx();
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    $self->DeleteInputFiles();

    DBQueryWarn("DELETE from experiment_pmapping ".
		"WHERE rsrcidx=$rsrcidx")
	if (defined($rsrcidx) && $rsrcidx);

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    DBQueryWarn("DELETE from experiment_resources ".
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		"WHERE idx=$rsrcidx")
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	if (defined($rsrcidx) && $rsrcidx);
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    DBQueryWarn("DELETE from testbed_stats ".
		"WHERE exptidx=$exptidx");

    # This must be last cause it provides the unique exptidx above.
    DBQueryWarn("DELETE from experiment_stats ".
		"WHERE eid='$eid' and pid='$pid' and exptidx=$exptidx");

    return 0;
}

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#
# Add an input file to the template. The point of this is to reduce
# duplication by taking an md5 of the input file, and sharing that
# record/file.
# 
sub AddInputFile($$;$)
{
    my ($self, $inputfile, $isnsfile) = @_;
    my $input_data_idx;
    my $isnew = 0;

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

    $isnsfile = 0
	if (! defined($isnsfile));

    return -1
	if (! -r $inputfile);

    my $data_string = `cat $inputfile`;
    return -1
	if ($?);

    my $exptidx  = $self->idx();
    my $rsrcidx  = $self->rsrcidx();

    if ($data_string) {
	# As you can see, we md5 the raw data.
	$data_string = DBQuoteSpecial($data_string);
	if (length($data_string) >= DBLIMIT_NSFILESIZE()) {
	    tberror("Input file is too big (> " . DBLIMIT_NSFILESIZE() . ")!");
	    return -1;
	}

	#
	# Grab an MD5 of the file to see if we already have a copy of it.
	# Avoids needless duplication.
	#
	my $md5 = `$MD5 -q $inputfile`;
	chomp($md5);

	DBQueryWarn("lock tables experiment_input_data write, ".
		    "            experiment_inputs write, ".
		    "            experiment_resources write")
	    or return -1;

	my $query_result =
	    DBQueryWarn("select idx from experiment_input_data ".
			"where md5='$md5'");

	if (!$query_result) {
	    DBQueryWarn("unlock tables");
	    return -1;
	}

	if ($query_result->numrows) {
	    ($input_data_idx) = $query_result->fetchrow_array();
	    $isnew = 0;
	}
	else {
	    $query_result =
		DBQueryWarn("insert into experiment_input_data ".
			    "(idx, md5, input) ".
			    "values (NULL, '$md5', $data_string)");
	    
	    if (!$query_result) {
		DBQueryWarn("unlock tables");
		return -1;
	    }
	    $input_data_idx = $query_result->insertid;
	    $isnew = 1;
	}
	if (! DBQueryWarn("insert into experiment_inputs ".
			  " (rsrcidx, exptidx, input_data_idx) values ".
			  " ($rsrcidx, $exptidx, '$input_data_idx')")) {
	    DBQueryWarn("delete from experiment_input_data ".
			"where idx='$input_data_idx'")
		if ($isnew);
	    DBQueryWarn("unlock tables");
	    return -1;
	}
	if ($isnsfile &&
	    $self->TableUpdate("experiment_resources",
			       "input_data_idx='$input_data_idx'") != 0) {
	    DBQueryWarn("unlock tables");
	    return -1;
	}
	DBQueryWarn("unlock tables");
    }
    return 0;
}

#
# Delete the input files, but only if not in use.
#
sub DeleteInputFiles($)
{
    my ($self) = @_;

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

    my $rsrcidx = $self->rsrcidx();
    my $nsidx   = $self->input_data_idx();

    DBQueryWarn("lock tables experiment_input_data write, ".
		"            experiment_resources write, ".
		"            experiment_inputs write")
	or return -1;

    #
    # Get all input files for this rsrc record.
    #
    my $query_result =
	DBQueryWarn("select input_data_idx from experiment_inputs ".
		    "where rsrcidx='$rsrcidx'");
    goto bad
	if (! $query_result);
    goto done
	if (! $query_result->numrows);

    while (my ($input_data_idx) = $query_result->fetchrow_array()) {
	#
	# Delete but only if not in use.
	#
	my $query_result =
	    DBQueryWarn("select count(rsrcidx) from experiment_inputs ".
			"where input_data_idx='$input_data_idx' and ".
			"      rsrcidx!='$rsrcidx'");
	goto bad
	    if (! $query_result);

	DBQueryWarn("delete from experiment_inputs ".
		    "where input_data_idx='$input_data_idx'")
	    or goto bad;

	if (defined($nsidx) && $nsidx == $input_data_idx) {
	    DBQueryWarn("update experiment_resources set input_data_idx=NULL ".
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			"where idx='$rsrcidx'")
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		or goto bad;
	}
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	next
	    if ($query_result->numrows);

	DBQueryWarn("delete from experiment_input_data ".
		    "where idx='$input_data_idx'")
	    or goto bad;
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    }
  done:
    DBQueryWarn("unlock tables");
    return 0;

  bad:
    DBQueryWarn("unlock tables");
    return 1;
}

#
# Grab an input file.
#
sub GetInputFile($$$)
{
    my ($self, $idx, $pref) = @_;

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

    my $query_result =
	DBQueryWarn("select input from experiment_input_data ".
		    "where idx='$idx'");
    return -1
	if (! $query_result || !$query_result->numrows);

    my ($nsfile) = $query_result->fetchrow_array();
    $$pref = $nsfile;
    return 0;
}

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

    return -1
	if (! ref($self));

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    my $idx = $self->idx();
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    my $query_result =
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	DBQueryWarn("select * from experiments where idx=$idx");
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    return -1
	if (!$query_result || !$query_result->numrows);

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    $self->{'EXPT'}       = $query_result->fetchrow_hashref();
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    $self->{'ISINSTANCE'} = undef;
    $self->{'ISTEMPLATE'} = undef;
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    $query_result =
	DBQueryWarn("select * from experiment_stats where exptidx='$idx'");
	
    return -1
	if (!$query_result || !$query_result->numrows);
    
    $self->{'STATS'} = $query_result->fetchrow_hashref();

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

    $query_result =
	DBQueryWarn("select * from experiment_resources ".
		    "where idx='$rsrcidx'");
	
    return -1
	if (!$query_result || !$query_result->numrows);
    
    $self->{'RSRC'} = $query_result->fetchrow_hashref();
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    return 0;
}

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#
# Perform some updates ...
#
sub Update($$)
{
    my ($self, $argref) = @_;

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

    my $pid = $self->pid();
    my $eid = $self->eid();

    my $query = "update experiments set ".
	join(",", map("$_='" . $argref->{$_} . "'", keys(%{$argref})));

    $query .= " where pid='$pid' and eid='$eid'";

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

    return Refresh($self);
}

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#
# Stringify for output.
#
sub Stringify($)
{
    my ($self) = @_;
    
    my $pid   = $self->pid();
    my $eid   = $self->eid();

    return "[Experiment: $pid/$eid]";
}

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#
# Generic function to look up some table values given a set of desired
# fields and some conditions. Pretty simple, not widely useful, but it
# helps to avoid spreading queries around then we need to. 
#
sub TableLookUp($$$;$)
{
    my ($self, $table, $fields, $conditions) = @_;

    # Must be a real reference. 
    return -1
	if (! ref($self));
    
    my $exptidx = $self->idx();

    if (defined($conditions) && "$conditions" ne "") {
	$conditions = "and ($conditions)";
    }
    else {
	$conditions = "";
    }

    return DBQueryWarn("select distinct $fields from $table ".
		       "where exptidx='$exptidx' $conditions");
}

#
# Ditto for update.
#
sub TableUpdate($$$;$)
{
    my ($self, $table, $sets, $conditions) = @_;

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

    if (ref($sets) eq "HASH") {
	$sets = join(",", map("$_='" . $sets->{$_} . "'", keys(%{$sets})));
    }
    my $exptidx = $self->idx();

    if (defined($conditions) && "$conditions" ne "") {
	$conditions = "and ($conditions)";
    }
    else {
	$conditions = "";
    }

    return 0
	if (DBQueryWarn("update $table set $sets ".
			"where exptidx='$exptidx' $conditions"));
    return -1;
}

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#
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# Check permissions. Allow for either uid or a user ref until all code
# updated.
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#
sub AccessCheck($$$)
{
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    my ($self, $user, $access_type) = @_;
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    # Must be a real reference. 
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    return 0
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	if (! ref($self));

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    if ($access_type < TB_EXPT_MIN ||
	$access_type > TB_EXPT_MAX) {
	die("*** Invalid access type: $access_type!");
    }

    # Admins do whatever they want.
    return 1
	if ($user->IsAdmin());

    my $group = $self->GetGroup();
    return 0
	if (!defined($group));
    my $project = $self->GetProject();
    return 0
	if (!defined($project));

    #
    # An experiment may be destroyed by the experiment creator or the
    # project/group leader.
    #
    my $mintrust;
    
    if ($access_type == TB_EXPT_READINFO) {
	$mintrust = PROJMEMBERTRUST_USER;
    }
    else {
	$mintrust = PROJMEMBERTRUST_LOCALROOT;
    }
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    #
    # Either proper permission in the group, or group_root in the project.
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