Experiment.pm.in 55.6 KB
Newer Older
1 2 3
#!/usr/bin/perl -wT
#
# EMULAB-COPYRIGHT
4
# Copyright (c) 2005, 2006, 2007 University of Utah and the Flux Group.
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
# 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;
20
use User;
21 22
use Project;
use Group;
23
use Node;
24 25
use English;
use Data::Dumper;
26
use File::Basename;
27 28
use overload ('""' => 'Stringify');

29 30 31 32
use vars qw($EXPT_PRELOAD $EXPT_START $EXPT_SWAPIN
	    $EXPT_SWAPOUT $EXPT_SWAPMOD
	    @EXPORT_OK);

33 34 35
# Configure variables
my $TB		= "@prefix@";
my $BOSSNODE    = "@BOSSNODE@";
36
my $CONTROL	= "@USERNODE@";
37
my $EVENTSYS    = @EVENTSYS@;
38
my $STAMPS      = @STAMPS@;
39 40 41 42 43 44 45 46
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";
47
my $DU          = "/usr/bin/du";
48

49 50 51 52 53 54 55 56 57 58 59 60 61 62
# 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;

# Why, why, why?
@EXPORT_OK = qw($EXPT_PRELOAD $EXPT_START
		$EXPT_SWAPIN $EXPT_SWAPOUT $EXPT_SWAPMOD);

63 64 65 66 67 68 69 70 71 72 73 74 75 76 77
# 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) = @_;

78 79 80 81
    my $cwd;
    chomp($cwd = `pwd`);

    print STDERR "Running '$command' in $cwd\n"
82 83 84 85 86 87 88
	if ($debug);
    return system($command);
}

#
# Lookup an experiment and create a class instance to return.
#
89
sub Lookup($$;$)
90
{
91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126
    my ($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();
    }
127 128

    # Look in cache first
129 130
    return $experiments{"$idx"}
        if (exists($experiments{"$idx"}));
131 132
    
    my $query_result =
133 134 135 136
	DBQueryWarn("select e.*,i.parent_guid from experiments as e ".
		    "left join experiment_template_instances as i on ".
		    "     i.exptidx=e.idx ".
		    "where e.idx='$idx'");
137 138 139 140 141 142

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

    my $self         = {};
    $self->{'EXPT'}  = $query_result->fetchrow_hashref();
143 144
    # An Instance?
    $self->{'ISINSTANCE'} = defined($self->{'EXPT'}->{'parent_guid'});
145 146 147 148 149 150 151 152 153

    $query_result =
	DBQueryWarn("select * from experiment_stats where exptidx='$idx'");
	
    return undef
	if (!$query_result || !$query_result->numrows);
    
    $self->{'STATS'} = $query_result->fetchrow_hashref();
    
154 155 156 157 158 159 160 161 162 163
    my $rsrcidx = $self->{'STATS'}->{'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();
164 165 166 167

    bless($self, $class);
    
    # Add to cache. 
168
    $experiments{"$idx"} = $self;
169 170 171 172
    
    return $self;
}
# accessors
173 174 175
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]}); }
176

177 178 179 180 181 182 183 184 185 186 187
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'); }
188
sub lastrsrc($)		{ return stats($_[0], 'lastrsrc'); }
189 190 191 192 193 194 195 196 197 198 199 200 201
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');}
202 203 204 205
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');}
206 207
sub dpdb($)		{ return field($_[0], 'dpdb');}
sub dpdbname($)         { return field($_[0], 'dpdbname');}
208
sub dpdbpassword($)     { return field($_[0], 'dpdbpassword');}
Leigh B. Stoller's avatar
Leigh B. Stoller committed
209
sub instance_idx($)     { return field($_[0], 'instance_idx'); }
210 211
sub creator_idx($)      { return field($_[0], 'creator_idx');}
sub swapper_idx($)      { return field($_[0], 'swapper_idx');}
212 213 214
sub use_ipassign($)     { return field($_[0], 'use_ipassign');}
sub ipassign_args($)    { return field($_[0], 'ipassign_args');}
sub security_level($)   { return field($_[0], 'security_level');}
215
sub archive_idx($)	{ return stats($_[0], 'archive_idx'); }
216 217
sub swapin_count($)	{ return stats($_[0], 'swapin_count'); }
sub destroyed($)	{ return stats($_[0], 'destroyed'); }
218
sub archive_tag($)	{ return resources($_[0], 'archive_tag'); }
219 220 221 222
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'); }
223 224

#
Leigh B. Stoller's avatar
Leigh B. Stoller committed
225
# Lookup an experiment given an experiment index.
226 227 228 229 230
#
sub LookupByIndex($$)
{
    my ($class, $exptidx) = @_;

231
    return Experiment->Lookup($exptidx);
232 233
}

234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
#
# 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;
}

256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271
# 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();
}

272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287
#
# 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";
288
    $spec .= ", experiment_resources read";
289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307
    
    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;
}

308 309 310 311 312 313
#
# 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($$$$)
{
314
    my ($class, $group, $eid, $argref) = @_;
315
    my $exptidx;
Leigh B. Stoller's avatar
Leigh B. Stoller committed
316
    my $now = time();
317 318

    return undef
319 320 321 322 323 324
	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();
325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416

    #
    # 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;
	}
    }

417 418 419 420 421 422 423
    # And a UUID (universally unique identifier).
    my $uuid = NewUUID();
    if (!defined($uuid)) {
	print "*** WARNING: Could not generate a UUID!\n";
	return undef;
    }

424 425 426 427 428 429 430 431 432 433 434 435
    #
    # 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'});

Leigh B. Stoller's avatar
Leigh B. Stoller committed
436 437 438 439
    # we override this below
    delete($argref->{'idx'})
	if (exists($argref->{'idx'}));

440 441 442 443
    my $query = "insert into experiments set ".
	join(",", map("$_='" . $argref->{$_} . "'", keys(%{$argref})));

    # Append the rest
Leigh B. Stoller's avatar
Leigh B. Stoller committed
444
    $query .= ",expt_created=FROM_UNIXTIME('$now')";
445
    $query .= ",expt_locked=now(),pid='$pid',eid='$eid',eid_uuid='$uuid'";
446
    $query .= ",pid_idx='$pid_idx',gid='$gid',gid_idx='$gid_idx'";
447 448 449
    $query .= ",expt_name=$description";
    $query .= ",noswap_reason=$noswap_reason";
    $query .= ",noidleswap_reason=$noidleswap_reason";
Leigh B. Stoller's avatar
Leigh B. Stoller committed
450
    $query .= ",idx=$exptidx";
451 452 453 454 455 456 457

    if (! DBQueryWarn($query)) {
	DBQueryWarn("unlock tables");
	tberror("Error inserting experiment record for $pid/$eid!");	
	return undef;
    }

458 459 460 461
    my $creator_uid = $argref->{'expt_head_uid'};
    my $creator_idx = $argref->{'creator_idx'};
    my $batchmode   = $argref->{'batchmode'};

462 463 464 465
    #
    # Create an experiment_resources record for the above record.
    #
    $query_result =
466 467 468
	DBQueryWarn("insert into experiment_resources ".
		    "(tstamp, exptidx, uid_idx) ".
		    "values (FROM_UNIXTIME('$now'), $exptidx, $creator_idx)");
469 470 471 472 473 474 475

    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;
    }
476
    my $rsrcidx     = $query_result->insertid;
477
    
478 479 480 481
    #
    # Now create an experiment_stats record to match.
    #
    if (! DBQueryWarn("insert into experiment_stats ".
482
		      "(eid, pid, creator, creator_idx, gid, created, ".
483
		      " batch, exptidx, rsrcidx, pid_idx, gid_idx, eid_uuid) ".
484 485
		      "values('$eid', '$pid', '$creator_uid', '$creator_idx',".
		      "       '$gid', FROM_UNIXTIME('$now'), ".
486
		      "        $batchmode, $exptidx, $rsrcidx, ".
487
		      "        $pid_idx, $gid_idx, '$uuid')")) {
488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519
	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));

520 521 522
    my $pid     = $self->pid();
    my $eid     = $self->eid();
    my $exptidx = $self->idx();
523 524 525 526 527 528

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

    TBExptDestroy($pid, $eid);

529 530 531 532 533 534 535 536 537
    #
    # 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();
    }
538
    return 0
539 540 541 542 543 544 545 546
	if (! $purge);
    
    #
    # Now we can clean up the stats records. 
    #
    my $rsrcidx = $self->rsrcidx();
    
    DBQueryWarn("DELETE from experiment_resources ".
547
		"WHERE idx=$rsrcidx")
Leigh B. Stoller's avatar
Leigh B. Stoller committed
548
	if (defined($rsrcidx) && $rsrcidx);
549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569
	
    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;
}

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

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

570
    my $idx = $self->idx();
571

572
    my $query_result =
573
	DBQueryWarn("select * from experiments where idx=$idx");
574 575 576 577 578

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

    $self->{'EXPT'}  = $query_result->fetchrow_hashref();
579
    $self->{'ISINSTANCE'} = undef;
580 581 582 583 584 585 586 587 588

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

589 590 591 592 593 594 595 596 597 598
    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();
599 600 601
    return 0;
}

Leigh B. Stoller's avatar
Leigh B. Stoller committed
602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626
#
# 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);
}

627 628 629 630 631 632 633 634 635 636 637 638 639
#
# Stringify for output.
#
sub Stringify($)
{
    my ($self) = @_;
    
    my $pid   = $self->pid();
    my $eid   = $self->eid();

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

640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694
#
# 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;
}

695
#
696 697
# Check permissions. Allow for either uid or a user ref until all code
# updated.
698 699 700
#
sub AccessCheck($$$)
{
701
    my ($self, $user, $access_type) = @_;
702 703 704 705 706

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

707
    my $uid = (ref($user) ? $user->uid() : $user);
708 709 710 711 712 713
    my $pid = $self->pid();
    my $eid = $self->eid();

    return TBExptAccessCheck($uid, $pid, $eid, $access_type);
}

714
#
Leigh B. Stoller's avatar
Leigh B. Stoller committed
715 716 717 718
# Create the directory structure. A template_mode experiment is the one
# that is created for the template wrapper, not one created for an
# instance of the experiment. The path changes slightly, although that
# happens down in the mkexpdir script.
719 720 721 722 723 724 725 726 727
#
sub CreateDirectory($)
{
    my ($self) = @_;

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

728
    my $idx = $self->idx();
729

730
    mysystem("$MKEXPDIR $idx");
731 732 733 734 735 736
    return -1
	if ($?);
    # mkexpdir sets the path in the DB. 
    return Refresh($self)
}

737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776
#
# Load the project object for an experiment.
#
sub GetProject($)
{
    my ($self) = @_;

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

    my $project = Project->Lookup($self->pid_idx());
    
    if (! defined($project)) {
	print("*** WARNING: Could not lookup project object for $self!", 1);
	return undef;
    }
    return $project;
}

#
# Load the group object for an experiment.
#
sub GetGroup($)
{
    my ($self) = @_;

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

    my $group = Group->Lookup($self->gid_idx());
    
    if (! defined($group)) {
	print("*** WARNING: Could not lookup group object for $self!\n");
	return undef;
    }
    return $group;
}

777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827
#
# Return the user and work directories. The workdir in on boss and where
# scripts chdir to when they run. The userdir is across NFS on ops, and
# where files are copied to. 
#
sub WorkDir($)
{
    my ($self) = @_;

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

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

    return TBDB_EXPT_WORKDIR() . "/${pid}/${eid}";
}
sub UserDir($)
{
    my ($self) = @_;

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

    return $self->path();
}

# Event/Web key filenames.
sub EventKeyPath($)
{
    my ($self) = @_;

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

    return UserDir($self) . "/tbdata/eventkey"; 
}
sub WebKeyPath($)
{
    my ($self) = @_;

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

    return UserDir($self) . "/tbdata/webkey"; 
}

828 829 830
#
# Add an environment variable.
#
831
sub AddEnvVariable($$$;$)
832
{
833
    my ($self, $name, $value, $index) = @_;
834 835 836 837 838 839 840

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

    my $pid = $self->pid();
    my $eid = $self->eid();
841
    my $exptidx = $self->idx();
842

843 844 845 846 847 848 849
    if (defined($value)) {
	$value = DBQuoteSpecial($value);
    }
    else {
	$value = "''";
    }

850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867
    #
    # Look to see if the variable exists, since a replace will actually
    # create a new row cause there is an auto_increment in the table that
    # is used to maintain order of the variables as specified in the NS file.
    #
    my $query_result =
	DBQueryWarn("select idx from virt_user_environment ".
		    "where name='$name' and pid='$pid' and eid='$eid'");

    return -1
	if (!$query_result);

    if ($query_result->numrows) {
	my $idx = (defined($index) ? $index :
		   ($query_result->fetchrow_array())[0]);
	    
	DBQueryWarn("replace into virt_user_environment set ".
		    "   name='$name', value=$value, idx=$idx, ".
868
		    "   exptidx='$exptidx', pid='$pid', eid='$eid'")
869 870 871 872 873
	    or return -1;
    }
    else {
	DBQueryWarn("insert into virt_user_environment set ".
		    "   name='$name', value=$value, idx=NULL, ".
874
		    "   exptidx='$exptidx', pid='$pid', eid='$eid'")
875 876
	    or return -1;
    }
877
    
878 879 880
    return 0;
}

881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918
#
# Write the environment strings into a little script in the user directory.
#
sub WriteEnvVariables($)
{
    my ($self) = @_;

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

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

    my $query_result =
	DBQueryWarn("select name,value from virt_user_environment ".
		    "where  pid='$pid' and eid='$eid' order by idx");
    return -1
	if (!defined($query_result));

    my $userdir = $self->UserDir();
    my $envfile = "$userdir/tbdata/environment";

    if (!open(FP, "> $envfile")) {
	print "Could not open $envfile for writing: $!\n";
	return -1;
    }
    while (my ($name,$value) = $query_result->fetchrow_array()) {
	print FP "${name}=\"$value\"\n";
    }
    if (! close(FP)) {
	print "Could not close $envfile: $!\n";
	return -1;
    }
    
    return 0;
}

919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957
#
# Experiment locking and state changes.
#
sub Unlock($;$)
{
    my ($self, $newstate) = @_;

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

    my $pid = $self->pid();
    my $eid = $self->eid();
    my $sclause = (defined($newstate) ? ",state='$newstate' " : "");

    my $query_result =
	DBQueryWarn("update experiments set expt_locked=NULL $sclause ".
		    "where eid='$eid' and pid='$pid'");

    if (! $query_result ||
	$query_result->numrows == 0) {
	return -1;
    }
    
    if (defined($newstate)) {
	$self->{'EXPT'}->{'state'} = $newstate;

	if ($EVENTSYS) {
	    EventSendWarn(objtype   => libdb::TBDB_TBEVENT_EXPTSTATE(),
			  objname   => "$pid/$eid",
			  eventtype => $newstate,
			  expt      => "$pid/$eid",
			  host      => $BOSSNODE);
	}
    }
    
    return 0;
}

958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992
sub Lock(;$)
{
    my ($self, $newstate) = @_;

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

    my $pid = $self->pid();
    my $eid = $self->eid();
    my $sclause = (defined($newstate) ? ",state='$newstate' " : "");

    my $query_result =
	DBQueryWarn("update experiments set expt_locked=now() $sclause ".
		    "where eid='$eid' and pid='$pid'");

    if (! $query_result ||
	$query_result->numrows == 0) {
	return -1;
    }
    
    if (defined($newstate)) {
	$self->{'EXPT'}->{'state'} = $newstate;

	if ($EVENTSYS) {
	    EventSendWarn(objtype   => libdb::TBDB_TBEVENT_EXPTSTATE(),
			  objname   => "$pid/$eid",
			  eventtype => $newstate,
			  expt      => "$pid/$eid",
			  host      => $BOSSNODE);
	}
    }
    return 0;
}

993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
sub SetState($$)
{
    my ($self, $newstate) = @_;

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

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

    my $query_result =
	DBQueryWarn("update experiments set state='$newstate' ".
		    "where eid='$eid' and pid='$pid'");

    if (! $query_result ||
	$query_result->numrows == 0) {
	return -1;
    }
    
    if (defined($newstate)) {
	$self->{'EXPT'}->{'state'} = $newstate;

	if ($EVENTSYS) {
	    EventSendWarn(objtype   => libdb::TBDB_TBEVENT_EXPTSTATE(),
			  objname   => "$pid/$eid",
			  eventtype => $newstate,
			  expt      => "$pid/$eid",
			  host      => $BOSSNODE);
	}
    }
    
    return 0;
}

#
# Logfiles. This all needs to change.
#
# Open a new logfile and return its name.
#
sub CreateLogFile($$$)
{
    my ($self, $prefix, $pref) = @_;

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

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

    # Need to deal with errors.
    $$pref = TBExptCreateLogFile($pid, $eid, $prefix);
    return 0;
}

1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081
#
# Set the experiments nsfiles table entry.
#
sub SetNSFile($$)
{
    my ($self, $nsfile) = @_;

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

    my $nsfile_string = `cat $nsfile`;
    return 0
	if (!$nsfile_string);

    my $pid = $self->pid();
    my $eid = $self->eid();
    my $idx = $self->idx();
    $nsfile_string = DBQuoteSpecial($nsfile_string);
    
    if (length($nsfile_string) >= DBLIMIT_NSFILESIZE()) {
	print "NS file is way too big!\n";
	return -1;
    }

    return -1    
	if (!DBQueryWarn("delete from nsfiles where exptidx='$idx'") ||
	    !DBQueryWarn("insert into nsfiles (exptidx, pid, eid, nsfile) ".
			 "values ($idx, '$pid', '$eid', $nsfile_string)"));

    return 0;
}

1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135
#
# Set the experiment to use the logfile. It becomes the "current" spew.
#
sub SetLogFile($$)
{
    my ($self, $logname) = @_;

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

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

    TBExptSetLogFile($pid, $eid, $logname);    
    return 0;
}

#
# Mark the log as open so that the spew keeps looking for more output.
# 
sub OpenLogFile($)
{
    my ($self) = @_;

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

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

    TBExptOpenLogFile($pid, $eid);    
    return 0;
}

#
# And close it ...
#
sub CloseLogFile($)
{
    my ($self) = @_;

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

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

    TBExptCloseLogFile($pid, $eid);    
    return 0;
}

1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153
#
# And clear it ...
#
sub ClearLogFile($)
{
    my ($self) = @_;

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

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

    TBExptClearLogFile($pid, $eid);    
    return 0;
}

1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166
#
# Run scripts over an experiment.
#
sub PreRun($;$$)
{
    my ($self, $nsfile, $options) = @_;

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

    my $pid = $self->pid();
    my $eid = $self->eid();
1167
    my $idx = $self->idx();
1168 1169 1170 1171 1172 1173

    $nsfile = ""
	if (!defined($nsfile));
    $options = ""
	if (!defined($options));

1174 1175
    print "Running 'tbprerun $options -e $idx $nsfile'\n";
    mysystem("$TBPRERUN $options -e $idx $nsfile");
1176 1177 1178 1179 1180
    return -1
	if ($?);
    return 0;
}

1181 1182 1183 1184
#
# Initialiaize bookkeeping for a swap operation.
#
sub PreSwap($$$)
1185
{
1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632
    my ($self, $swapper, $which) = @_;

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

    my $exptidx  = $self->idx();
    my $rsrcidx  = $self->rsrcidx();
    my $lastrsrc = $rsrcidx;
    my $uid_idx  = $swapper->uid_idx();
    # XXX state is no longer "active" for swapmod of active experiment.
    my $isactive = $self->swapin_time(); 

    #
    # We should never get here with a lastrsrc in the stats record; it
    # indicates something went wrong, and we need to clean up the DB
    # state by hand.
    #
    if ($self->lastrsrc()) {
	print STDERR "Inconsistent lastrsrc in stats record for $self!\n";
	return -1;
    }

    #
    # Generate a new resource record, but watch for the unused one that
    # we got when the experiment was first created.
    #
    if ($which eq $EXPT_SWAPMOD || $which eq $EXPT_SWAPIN) {
	#
	# In SWAPIN, copy over the thumbnail. This is temporary; I think
	# the thumbnail is going to end up going someplace else. 
	#
	my $thumbdata = (defined($self->thumbnail()) ?
			 DBQuoteSpecial($self->thumbnail()) : "NULL");
	my $byswapmod = ($which eq $EXPT_SWAPMOD ? 1 : 0);
	my $byswapin  = ($which eq $EXPT_SWAPIN  ? 1 : 0);

	my $query_result =
	    DBQueryWarn("insert into experiment_resources ".
			" (idx, uid_idx, tstamp, exptidx, lastidx, ".
			"  byswapmod, byswapin, thumbnail) ".
			"values (0, '$uid_idx', now(), $exptidx, $rsrcidx,".
			"        $byswapmod, $byswapin, $thumbdata)");
	return -1
	    if (! $query_result ||
		! $query_result->insertid);
	
	my $newrsrc = $query_result->insertid;
	
	DBQueryWarn("update experiment_stats set ".
		    "  rsrcidx=$newrsrc,lastrsrc=$rsrcidx ".
		    "where exptidx=$exptidx")
	    or goto failed;

	$self->Refresh() == 0
	    or goto failed;

	$rsrcidx = $newrsrc;
    }

    #
    # Update the timestamps in the current resource record to reflect
    # the official start of the operation.
    #
    if ($which eq $EXPT_SWAPIN) {
	DBQueryWarn("update experiment_resources set ".
		    "  swapin_time=UNIX_TIMESTAMP(now()) ".
		    "where idx='$rsrcidx'")
	    or goto failed;
    }
    elsif ($which eq $EXPT_SWAPOUT && ! $self->swapout_time()) {
	# Do not overwrite it; means a previously failed swapout, but for
	# accounting purposes, we want the original time.
	DBQueryWarn("update experiment_resources set ".
		    "  swapout_time=UNIX_TIMESTAMP(now()) ".
		    "where idx='$rsrcidx'")
	    or goto failed;
    }
    elsif ($which eq $EXPT_SWAPMOD && $isactive) {
	DBQueryWarn("update experiment_resources set ".
		    "  swapin_time=UNIX_TIMESTAMP(now()) ".
		    "where idx='$rsrcidx'")
	    or goto failed;
	#
	# If this swapmod fails, the record is deleted of course.
	# But if it succeeds, we will also change the previous record
	# to reflect the swapmod time. See PostSwap() below.
	#
    }

    # Old swap gathering stuff.
    $self->GatherSwapStats($swapper, $which, 0,
			   libdb::TBDB_STATS_FLAGS_START()) == 0
	or goto failed;

    # We do these here since even failed operations implies activity.
    # No worries if they fail; just informational.
    $swapper->BumpActivity();
    $self->GetProject()->BumpActivity();
    $self->GetGroup()->BumpActivity();
    return 0;

  failed:
    $self->SwapFail($which, 55);
    return -1;
}

#
# Rollback after a failed swap operation; cleans up the stats and resources.
#
sub SwapFail($$$$)
{
    my ($self, $swapper, $which, $ecode) = @_;

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

    # Old swap gathering stuff.
    $self->GatherSwapStats($swapper, $which, $ecode);

    my $exptidx = $self->idx();
    my $session = libtblog::tblog_session();
    $session = 'NULL' unless defined $session;

    # This is pointless.
    DBQueryWarn("update experiment_stats set ".
		"  swap_errors=swap_errors+1, ".
		"  swap_exitcode=$ecode, ".
		"  last_error=$session ".
		"where exptidx=$exptidx");

    #
    # Get current and last rsrc record direct from DB to avoid local cache.
    #
    my $query_result =
	DBQueryWarn("select rsrcidx,lastrsrc from experiment_stats ".
		    "where exptidx=$exptidx");

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

    my ($rsrcidx, $lastrsrc) = $query_result->fetchrow_array();

    #
    # Special case; The first swapin does not get a new resource record,
    # and so there will be nothing to delete. So, clear the swapin time.
    # I think we can get rid of this special case, and also the case of
    # creating a new resource record when doing a swapmod to an inactive
    # experiment, but do not want to tackle that at this time
    #
    if (! $lastrsrc && $which eq $EXPT_SWAPIN) {
	DBQueryWarn("update experiment_resources set swapin_time=0 ".
		    "where idx='$rsrcidx'")
	or return -1;
    }
    
    return 0
	if (! $lastrsrc);

    #
    # If there is a lastrsrc record, it means the current one is bogus and
    # needs to be deleted, and the stats record repointed to the last one.
    # If this reset operation fails, lets be sure to set the timestamps in
    # the bogus resource record to 0 so that we have an indication that
    # something went wrong when we later traverse the chain of records. 
    #
    DBQueryWarn("update experiment_resources set ".
		"  swapin_time=0,swapmod_time=0,swapout_time=0 ".
		"where idx='$rsrcidx'")
	or return -1;

    if ($which eq $EXPT_SWAPMOD &&
	$self->state() eq libdb::EXPTSTATE_ACTIVE()) {
	DBQueryWarn("update experiment_resources set swapmod_time=0 ".
		    "where idx='$lastrsrc'")
	    or return -1;
    }

    DBQueryWarn("delete from experiment_resources ".
		"where idx=$rsrcidx")
	or return -1;

    #
    # This last step clears lastrsrc, which is how we know that the record
    # is consistent and that we can do another swap operation on it.
    #
    DBQueryWarn("update experiment_stats set ".
		"  rsrcidx=$lastrsrc,lastrsrc=NULL ".
		"where exptidx=$exptidx")
	or return -1;

    $self->Refresh();

    #
    # If we fail to clear the lastrsrc record, the next swap operation will
    # fail until the DB is cleaned up.
    #
    return 0;
}

#
# Finalize bookkeeping for a swap operation.
#
sub PostSwap($$$$)
{
    my ($self, $swapper, $which, $flags) = @_;

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

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

    # Old swap gathering stuff.
    $self->GatherSwapStats($swapper, $which, 0) == 0
	or return -1;

    #
    # On a swapout/modify complete, update the duration counters. We
    # want to update the aggregates too below, so get the numbers we
    # need for that first. Modify is a bit of a complication since we
    # want to charge for the experiment as it *was* until this point,
    # since the number of nodes has changed.
    #
    my $pnodes       = 0;
    my $vnodes       = 0;
    my $duration     = 0;
    my $prev_uid_idx = 0;
    my $prev_swapper = $swapper;

    if ($which eq $EXPT_SWAPOUT ||
	($which eq $EXPT_SWAPMOD &&
	 $self->state() eq libdb::EXPTSTATE_ACTIVE())) {
	my $query_result;
	
	#
	# If this is a swapout, we use the current resource record. If this
	# is a swapmod, we have to back to the previous resource record,
	# since the current one reflects usage for the new swap.
	#
	if ($which eq $EXPT_SWAPOUT) {
	    $query_result =
		DBQueryWarn("select r.pnodes,r.vnodes,r.uid_idx, ".
			    "  r.swapout_time - r.swapin_time ".
			    " from experiment_resources as r ".
			    "where r.idx='$rsrcidx'");
	}
	else {
	    $query_result =
		DBQueryWarn("select r.pnodes,r.vnodes,r.uid_idx, ".
			    "  r.swapmod_time - r.swapin_time ".
			    " from experiment_resources as r ".
			    "where r.idx='$rsrcidx'");
	}
	return -1
	    if (!$query_result);
	
	if ($query_result->numrows) {
	    ($pnodes,$vnodes,$prev_uid_idx,$duration) =
		$query_result->fetchrow_array;
	    # Might happen if swapin stats got losts.
	    $duration = 0
		if (! defined($duration));

	    $prev_swapper = User->Lookup($prev_uid_idx);
	    $prev_swapper = $swapper
		if (!defined($prev_swapper));
	}
    }

    if ($which eq $EXPT_SWAPMOD) {
	my $when = "UNIX_TIMESTAMP(now())";
	# unless its active, in which case pick up swapin time.
	$when = $self->swapin_time()
	    if ($self->state() eq libdb::EXPTSTATE_ACTIVE());
	
	DBQueryWarn("update experiment_resources set ".
		    "  swapmod_time=$when ".
		    "where idx='$lastrsrc'")
	    or return -1;
    }

    # Special case for initial record. Needs to be fixed.
    if ($which eq $EXPT_SWAPIN && !$self->lastidx()) {
	DBQueryWarn("update experiment_resources set byswapin=1 ".
		    "where idx='$rsrcidx'")
	    or return -1;
    }

    #
    # Increment idleswap indicator, but only valid on swapout. Harmless
    # if this fails, so do not worry about it.
    #
    if ($which eq $EXPT_SWAPOUT &&
	$flags & libdb::TBDB_STATS_FLAGS_IDLESWAP()) {
	DBQueryWarn("update experiment_stats ".
		    "set idle_swaps=idle_swaps+1 ".
		    "where exptidx=$exptidx");
    }

    #
    # On successful swapin, get the number of pnodes. assign_wrapper
    # has filled in everything else, but until the experiment actually
    # succeeds in swapping, do not set the pnode count. The intent
    # is to avoid counting experiments that ultimately fail as taking
    # up physical resources.
    #
    if ($which eq $EXPT_START ||
	$which eq $EXPT_SWAPIN ||
	$which eq $EXPT_SWAPMOD) {
	my $query_result =
	    DBQueryWarn("select r.node_id from reserved as r ".
			"left join nodes as n on r.node_id=n.node_id ".
			"where r.exptidx='$exptidx' and n.role='testnode'");

	return -1
	    if (! $query_result);

	$pnodes = $query_result->numrows;

	DBQueryWarn("update experiment_resources set pnodes=$pnodes ".
		    "where idx=$rsrcidx")
	    or return -1;
    }
    
    #
    # Per project/group/user aggregates. These can now be recalculated,
    # so if this fails, do not worry about it.
    #
    if ($which eq $EXPT_PRELOAD ||
	$which eq $EXPT_START ||
	$which eq $EXPT_SWAPOUT ||
	$which eq $EXPT_SWAPIN ||
	$which eq $EXPT_SWAPMOD) {
	$self->GetProject()->UpdateStats($which, $duration, $pnodes, $vnodes);
	$self->GetGroup()->UpdateStats($which, $duration, $pnodes, $vnodes);
	if ($which eq $EXPT_SWAPOUT ||
	    $which eq $EXPT_SWAPMOD) {
	    $prev_swapper->UpdateStats($which, $duration, $pnodes, $vnodes);
	}
	else {
	    $swapper->UpdateStats($which, 0, 0, 0);
	}

	#
	# Update the per-experiment record.
	# Note that we map start into swapin.
	#
	if ($which eq $EXPT_SWAPOUT ||
	    $which eq $EXPT_SWAPIN ||
	    $which eq $EXPT_START ||
	    $which eq $EXPT_SWAPMOD) {
	    my $tmp = $which;
	    if ($which eq $EXPT_START) {
		$tmp = $EXPT_SWAPIN;
	    }
	    DBQueryWarn("update experiment_stats ".
			"set ${tmp}_count=${tmp}_count+1, ".
			"    ${tmp}_last=now(), ".
			"    swapin_duration=swapin_duration+${duration}, ".
			"    swap_exitcode=0, ".
			"    last_error=NULL ".
			"where exptidx=$exptidx");
	}

	# Batch mode info.
	if ($which eq $EXPT_SWAPIN || $which eq $EXPT_START) {
	    my $batchmode = $self->batchmode();
	    
	    DBQueryWarn("update experiment_resources set ".
			"    batchmode=$batchmode ".
			"where idx=$rsrcidx");
	}
    }

    #
    # This last step clears lastrsrc, which is how we know that the record
    # is consistent and that we can do another swap operation on it.
    #
    DBQueryWarn("update experiment_stats set lastrsrc=NULL ".
		"where exptidx=$exptidx");
    
    $self->Refresh();
    
    return 0;