stated.in 20.1 KB
Newer Older
Robert Ricci's avatar
Robert Ricci committed
1
#!/usr/bin/perl -w
Leigh B. Stoller's avatar
Leigh B. Stoller committed
2 3 4 5 6 7
#
# EMULAB-COPYRIGHT
# Copyright (c) 2000-2002 University of Utah and the Flux Group.
# All rights reserved.
#

Robert Ricci's avatar
Robert Ricci committed
8 9 10
#
# stated - A daemon to monitor the states of nodes in the testbed. Recives
# state change notification through the event system, and writes the new
11 12
# state into the database. Also watches for invalid transitions, timeouts, 
# and performs other state-related control functions.
Robert Ricci's avatar
Robert Ricci committed
13 14 15 16
#
# Send it a HUP signal to get it to reload the timeout and transition
# information. Periodically reloads this information regardless, though.
#
17
# Will restart when sent SIGUSR1, by exec'ing its executable again.
Robert Ricci's avatar
Robert Ricci committed
18
#
19

Robert Ricci's avatar
Robert Ricci committed
20 21
# Configure variables
use lib '@prefix@/lib';
22
my $TB = "@prefix@";
Robert Ricci's avatar
Robert Ricci committed
23
my $BOSSNODE = "@BOSSNODE@";
24
my $TBOPS = '@TBSTATEDEMAIL@';
25
my $TBDBNAME = "@TBDBNAME@";
26
my $osselect = "$TB/bin/os_select";
Robert Ricci's avatar
Robert Ricci committed
27 28 29 30 31 32 33

$| = 1;

use event;
use libdb;
use libtestbed;
use Getopt::Std;
34
#use strict;
Robert Ricci's avatar
Robert Ricci committed
35
use English;
36 37
use POSIX; # for strftime, and sigprocmask and friends
use Sys::Syslog;
38
use Fcntl; # file constants for pidfile
Robert Ricci's avatar
Robert Ricci committed
39 40 41 42

# Number of iterations (roughly, seconds) after which we'll reload 
# information from the database. This is so we don't end up with information
# that's _too_ out of sync.
43
my $reload_time = 3600;
Robert Ricci's avatar
Robert Ricci committed
44 45 46 47 48

# Process command-line arguments

sub usage {
	print << "END";
49 50 51
Usage: $0 [-h] [-d] [-s server] [-p port]
-h              This message
-d              Turn on debugging output, and don't go into the background
Robert Ricci's avatar
Robert Ricci committed
52 53
-s server       Use specified server, instead of this site's bossnode
-p port	        Use specified port
54
Send SIGHUP to reload database state, or SIGUSR1 to restart completely.
Robert Ricci's avatar
Robert Ricci committed
55 56 57
END
}

58
my @args = @ARGV; # save a copy for restart before we mess with them.
Robert Ricci's avatar
Robert Ricci committed
59
my %opt = ();
60
getopts("ds:p:h",\%opt);
Robert Ricci's avatar
Robert Ricci committed
61 62 63 64

if ($opt{h}) { exit &usage; }
if (@ARGV) { exit &usage; }

65
my ($server,$port,$debug);
Robert Ricci's avatar
Robert Ricci committed
66 67 68 69
if ($opt{s}) { $server = $opt{s}; } else { $server = $BOSSNODE; }
if ($opt{p}) { $port = $opt{p}; }
if ($opt{d}) { $debug = 1; } else { $debug = 0; }

70 71 72 73 74 75 76 77 78
# Grab some constants into variables
my $TBRESET      = TBDB_TBCONTROL_RESET;
my $TBRELOADDONE = TBDB_TBCONTROL_RELOADDONE;
my $TBTIMEOUT    = TBDB_TBCONTROL_TIMEOUT;
my $TBNOTIMEOUT  = TBDB_NO_STATE_TIMEOUT;
my $TBNODESTATE  = TBDB_TBEVENT_NODESTATE;
my $TBNODEOPMODE = TBDB_TBEVENT_NODEOPMODE;
my $TBCONTROL    = TBDB_TBEVENT_TBCONTROL;

Robert Ricci's avatar
Robert Ricci committed
79
# Background
80 81 82 83 84
if (!$debug) {
  # We use syslog, so redirect the output to nothing
  if (TBBackGround("/dev/null")) { exit(0); }
  # set up syslog
  openlog("stated","pid","user");
85 86 87 88 89 90 91 92 93 94
  my $str=$TB;
  $str =~ s/\/usr\/testbed//g;
  $str =~ s/\//\./g;
  my $pidfile = ($TB eq "/usr/testbed" ?
		 "/var/run/stated.pid" :
		 "/var/run/stated$str.pid" );
  sysopen(PIDFILE, $pidfile, O_WRONLY | O_EXCL | O_CREAT) ||
    die ("Couldn't create '$pidfile': $? $!\n");
  print PIDFILE "$$";
  close PIDFILE;
Robert Ricci's avatar
Robert Ricci committed
95 96
}

97 98 99
# Change my $0 so that it is easier to see in a ps/top
$0 = "$0";

Robert Ricci's avatar
Robert Ricci committed
100 101 102 103 104 105 106 107 108 109
my $URL = "elvin://$server";
if ($port) { $URL .= ":$port"; }

# Connect to the event system, and subscribe the the events we want 
my $handle = event_register($URL,0);
if (!$handle) { die "Unable to register with event system\n"; }

my $tuple = address_tuple_alloc();
if (!$tuple) { die "Could not allocate an address tuple\n"; }

110 111
%$tuple = ( objtype => join(",",$TBNODESTATE,$TBNODEOPMODE,$TBCONTROL) );

Robert Ricci's avatar
Robert Ricci committed
112
if (!event_subscribe($handle,\&handleEvent,$tuple)) {
113
	die "Could not subscribe to events\n";
Robert Ricci's avatar
Robert Ricci committed
114 115 116 117
}

# Read in the pre-existing node states, and timeout and valid transition
# information from the database
118 119 120 121 122
my %nodes     = readStates();
my %timeouts  = getTimeouts();
my %valid     = getValid();
my %modeTrans = getModeTrans();
my %triggers  = getTriggers();
Robert Ricci's avatar
Robert Ricci committed
123 124 125 126 127 128 129

# Gets set if a reload of state from the database should happen.
my $do_reload = 0;

# Make the daemon reload database state on a sighup - but I'm worried
# about what would happen if we tried to do this mid-loop. So, we'll
# just set a flag and do it when we're done with our current pass.
130 131 132 133 134 135 136
$SIG{HUP}  = sub { info("SIGHUP - Reloading DB state\n"); $do_reload = 1; };

# Set up other signals. Unblock USR1 in case we're here because of a
# restart, and it still think's we're handling USR1.
$SIG{USR1} = \&restart;
$SIG{USR2} = \&cleanup;
$SIG{INT}  = \&cleanup;
137 138 139 140
$SIG{QUIT} = \&cleanup;
$SIG{ABRT} = \&cleanup;
$SIG{TERM} = \&cleanup;
$SIG{KILL} = \&cleanup;
Robert Ricci's avatar
Robert Ricci committed
141

142
info("stated starting up\n");
Robert Ricci's avatar
Robert Ricci committed
143

144
# Now, we just poll for events, and watch for timeouts
Robert Ricci's avatar
Robert Ricci committed
145 146 147 148 149 150 151 152
my $iterations = 0;
while (1) {
	event_poll($handle);
	my $now = time();
	#
	# Look for nodes that have passed their timeout
	#
	while (my ($node, $value) = each %nodes) {
153 154 155 156 157 158 159 160 161 162 163 164 165 166 167
	    my $state    = $value->{state};
	    my $mode     = $value->{mode};
	    my $time     = $value->{timestamp};
	    my $notified = $value->{notified};
	    my ($timeout,$action);
	    if ($mode && $state && $timeouts{$mode} &&
		$timeouts{$mode}{$state}) {
		($timeout, $action) = @{$timeouts{$mode}{$state}};
	    }
	    if ((!$notified) && $time && $timeout && 
		$timeout!= $TBNOTIMEOUT && (($time + $timeout) < $now)) {
		handleCtrlEvent($node,$TBTIMEOUT);
		$value->{notified} = 1;
		
	    }
Robert Ricci's avatar
Robert Ricci committed
168 169 170 171 172 173 174 175 176 177 178 179 180
	}

	if ($do_reload || ($iterations > $reload_time)) {
		reload();
		$do_reload = 0;
		$iterations = 0;
	}

	$iterations++;
	sleep(1);
}

# Read the current states of nodes from the database
181 182 183
sub readStates(;@) {
    	my %oldnodes = @_;

184 185 186 187 188 189 190
	#
	# Guard against undefined variable warnings
	#
	if (! defined(%oldnodes)) {
		%oldnodes = ();
	}

191
	#debug("readStates called\n");
Robert Ricci's avatar
Robert Ricci committed
192
	my $result = DBQueryFatal("SELECT node_id, eventstate, " .
193 194
				  "state_timestamp, op_mode, " .
				  "op_mode_timestamp FROM nodes");
Robert Ricci's avatar
Robert Ricci committed
195 196

	my %nodes;
197 198
	while (my ($node_id, $state, $timestamp, $mode, $mode_timestamp)
			= $result->fetchrow()) {
199 200 201 202 203 204
	    	#
		# If there's an entry in oldnodes for this node, and it
		# hasn't changed state or time, use the old entry (so that
		# we don't lose information about which nodes we've already
		# notified the ops about, etc.)
		#
205 206
		if ($oldnodes{$node_id} && $state && $timestamp &&
		   ($oldnodes{$node_id}{state} eq $state) &&
207
		   ($oldnodes{$node_id}{mode} eq $mode) &&
208
		   ($oldnodes{$node_id}{timestamp} == $timestamp)) {
209 210
		       $nodes{$node_id} = $oldnodes{$node_id};
		} else { 
211 212 213 214
		    $nodes{$node_id}{state}          = $state;
		    $nodes{$node_id}{timestamp}      = $timestamp;
		    $nodes{$node_id}{mode}           = $mode;
		    $nodes{$node_id}{mode_timestamp} = $mode_timestamp;
215
		}
Robert Ricci's avatar
Robert Ricci committed
216 217 218 219 220 221 222 223
	}
	return %nodes;
}

#
# Read timeouts for various states from the database
#
sub getTimeouts() {
224
	#debug("getTimeouts called\n");
225
	my $result = DBQueryFatal("SELECT op_mode, state, timeout, action " .
Robert Ricci's avatar
Robert Ricci committed
226 227 228
				  "FROM state_timeouts");

	my %timeouts;
229 230
	while (my ($op_mode, $state, $timeout, $action) = $result->fetchrow()) {
		$timeouts{$op_mode}{$state} = [ $timeout, $action ];
Robert Ricci's avatar
Robert Ricci committed
231 232 233 234 235 236 237 238
	}
	return %timeouts;
}

#
# Read the list of valid state transitions from the database
#
sub getValid() {
239
	#debug("getValid called\n");
240
	my $result = DBQueryFatal("SELECT op_mode, state1, state2 " .
Robert Ricci's avatar
Robert Ricci committed
241 242 243
				  "FROM state_transitions");

	my %valid;
244 245
	while (my ($mode,$state1, $state2) = $result->fetchrow()) {
		$valid{$mode}{$state1}{$state2} = 1;
Robert Ricci's avatar
Robert Ricci committed
246 247 248 249
	}
	return %valid;
}

250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286
#
# Read the list of valid mode transitions from the database
#
sub getModeTrans() {
	#debug("getModeTrans called\n");
	my $result = 
	    DBQueryFatal("SELECT op_mode1, state1, op_mode2, state2 " .
			 "FROM mode_transitions order by op_mode1,state1");

	my %modeTrans;
	while (my ($mode1,$state1, $mode2, $state2) = $result->fetchrow()) {
	    if (!defined($modeTrans{"$mode1:$state1"})) {
		$modeTrans{"$mode1:$state1"}= ["$mode2:$state2"];
	    } else {
		my @l = @{$modeTrans{"$mode1:$state1"}};
		push(@l, "$mode2:$state2");
		$modeTrans{"$mode1:$state1"}= \@l;
	    }
	}
	return %modeTrans;
}

#
# Read the list of states which trigger an action
#
sub getTriggers() {
	#debug("getTriggers called\n");
	my $result = 
	    DBQueryFatal("SELECT op_mode, state, trigger " .
			 "FROM state_triggers order by op_mode,state");
	my %t;
	while (my ($mode,$state, $trig) = $result->fetchrow()) {
	    $t{"$mode:$state"} = $trig;
	}
	return %t;
}

Robert Ricci's avatar
Robert Ricci committed
287 288 289 290 291
#
# Gets called for every event that we recieve
#
sub handleEvent($$$) {
	my ($handle,$notification,$data) = @_;
292
	my $objtype = event_notification_get_objtype($handle,$notification);
Robert Ricci's avatar
Robert Ricci committed
293 294 295
	my $objname = event_notification_get_objname($handle,$notification);
	my $eventtype = event_notification_get_eventtype($handle,$notification);

296
	info("Got an event: ($objtype,$objname,$eventtype)\n");
297

298 299 300 301
	#
	# Check to see if another instance is supposed to be handling this node
	#
	if (!checkDBRedirect($objname)) {
302
	    info("Got an event for node $objname, which isn't mine\n");
303 304 305
	    return;
	}

306 307
	SWITCH: for ($objtype) {

308
	    (/$TBNODESTATE/) && do {
309 310 311
		stateTransition($objname,$eventtype);
		last;
	    };
312
	    (/$TBNODEOPMODE/) && do {
313
		opModeTransition($objname,$eventtype);
314 315 316 317
		notify("Use of deprecated event TBNODEOPMODE:\n".
		       "$objname->$eventtype\n");
		last;
	    };
318
	    (/$TBCONTROL/) && do {
319
		handleCtrlEvent($objname,$eventtype);
320 321 322 323 324 325 326 327 328
		last;
	    };

	}

}

sub stateTransition($$) {

329
    my ($node,$newstate) = @_;
Robert Ricci's avatar
Robert Ricci committed
330

331 332 333 334 335 336 337 338
    # Check for invalid transitions
    my ($oldstate, $mode);
    if ($nodes{$node}) {
	$oldstate = $nodes{$node}{state};
	$mode = $nodes{$node}{mode};
    } else {
	# Try reloading the cache once before we give up on this node
	reload();
339
	if ($nodes{$node}) {
340 341
	    $oldstate = $nodes{$node}{state};
	    $mode = $nodes{$node}{mode};
Robert Ricci's avatar
Robert Ricci committed
342
	} else {
343
	    notify("Got an event for a node ($node) I don't know about\n");
Robert Ricci's avatar
Robert Ricci committed
344
	}
345 346 347 348
    }
    if ($oldstate && $mode && $valid{$mode} && $valid{$mode}{$oldstate} &&
	!$valid{$mode}{$oldstate}{$newstate}) {
	notify("Invalid transition for node $node from $mode/$oldstate " .
349
	       "to $newstate\n".`/usr/testbed/sbin/inuse | grep $node\  `);
350
    }
Robert Ricci's avatar
Robert Ricci committed
351

352 353 354 355
    my $now = time();
    $nodes{$node}{state}     = $newstate;
    $nodes{$node}{timestamp} = $now;
    $nodes{$node}{notified}  = 0;
356

357 358 359
    info("$node: $mode/$oldstate => $mode/$newstate\n");
    DBQueryFatal("UPDATE nodes SET eventstate='$newstate', " .
		 "state_timestamp='$now' WHERE node_id='$node'");
360

361 362 363 364 365
    # Check if this is TBDB_NODESTATE_BOOTING , which has actions
    if ($newstate eq TBDB_NODESTATE_BOOTING) {
	my $osid = TBBootWhat($node,$debug);
	info("$node: Current OS is '$osid'\n");
	DBQueryFatal("UPDATE nodes SET osid='$osid' WHERE node_id='$node'");
366

367 368
	checkGenISUP($node);
    }
369

370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391
    # Check if this state is the "successful boot" state
    if (defined($triggers{"$mode:$newstate"})) {
	my @trigs = split(/\s*,\s*/,$triggers{"$mode:$newstate"});
	foreach ( @trigs ) {
	    my $trig = $_;
	    /^$TBRESET$/ && do {
		# Check if we really need to do a reset
		my $r = DBQueryWarn("select osid,def_boot_osid from nodes ".
				    "where node_id='$node'");
		my ($osid,$defosid) = $r->fetchrow();
		if ($osid ne $defosid) {
		    handleCtrlEvent($node,$trig);
		}
		next;
	    };
	    /^$TBRELOADDONE$/ && do {
		handleCtrlEvent($node,$trig);
		next;
	    };
	    notify("Unknown trigger '$trig' in $mode/$newstate!\n");
	}
    }
392

393 394 395 396 397 398 399 400 401 402 403 404
    # Check if this state can trigger a mode transition
    if (defined($modeTrans{"$mode:$newstate"})) {
	info("$node: Checking for mode transition\n");
	my $r = DBQueryWarn("select next_op_mode from nodes ".
			    "where node_id='$node'");
	my ($nextmode) = $r->fetchrow();
	if ($nextmode) {
	    opModeTransition($node,$nextmode);
	} else { debug("No next mode.\n"); }
    }
    
}
405

406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467
sub opModeTransition($$) {
    
    my ($node,$newmode) = @_;
    
    info("$node: Mode change to $newmode requested\n");
    # Check for invalid transitions
    my ($oldstate, $mode, $nextstate);
    if ($nodes{$node}) {
	$oldstate = $nodes{$node}{state};
	$mode = $nodes{$node}{mode};
    } else {
	# Try reloading the cache once before we give up on this node
	reload();
	if ($nodes{$node}) {
	    $oldstate = $nodes{$node}{state};
	    $mode = $nodes{$node}{mode};
	} else {
	    notify("Got an event for a node ($node) I don't know about\n");
	}
    }
    if (defined($modeTrans{"$mode:$oldstate"})) {
	debug("Mode Transition check:\n");
	my $translist = join(",",@{$modeTrans{"$mode:$oldstate"}});
	#debug("translist=$translist\n");
	#debug("splitlist=".join(", ",split(/[:,]/,$translist))."\n");
	my %trans = split(/[:,]/,$translist);
	debug("Valid transitions from $mode/$oldstate are:\n");
	foreach my $k (sort keys %trans) { debug("$k => $trans{$k}\n"); }
	if (defined($trans{$newmode})) {
	    $nextstate=$trans{$newmode};
	} else {
	    notify("Invalid mode transition from ".
		   "$mode/$oldstate to $newmode!\n");
	}
    } else {
	notify("Invalid mode transition from $mode/$oldstate: ".
	       "Not a valid mode transition state!\n");
    }
    if (!$nextstate) { $nextstate=$oldstate; }

    my $now = time();
    $nodes{$node}{state}     = $nextstate;
    $nodes{$node}{timestamp} = $now;
    $nodes{$node}{mode}           = $newmode;
    $nodes{$node}{mode_timestamp} = $now;
    $nodes{$node}{notified}       = 0;
    
    info("$node: $mode/$oldstate => $newmode/$nextstate\n");
    DBQueryFatal("UPDATE nodes SET eventstate='$nextstate', ".
		 "next_op_mode='', op_mode='$newmode', ".
		 "state_timestamp='$now', ".
		 "op_mode_timestamp='$now' WHERE node_id='$node'");
    
}

sub handleCtrlEvent($$) {
    my ($node,$event) = @_;

    info("CtrlEvent: $node, $event\n");

    foreach ($event) {
	/^$TBRESET$/ && do {
468 469 470 471
	    my $cmd = "$osselect -m PXEBOOT $node";
	    system($cmd) and
		notify("$node/$event: Couldn't clear next_pxe_boot_path\n".
		       "\tcmd=$cmd\n\t*** $!\n");
472 473 474 475 476

	    my $result = DBQueryFatal("SELECT def_boot_osid FROM nodes ".
				      "where node_id='$node'");
	    my ($osid) = $result->fetchrow();

477 478 479 480
	    $cmd = "$osselect $osid $node";
	    system($cmd) and
		notify("$node/$event: Couldn't clear next_boot_*\n".
		       "\tcmd=$cmd\n\t*** $!\n");
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507

	    info("Performed RESET for $node to $osid\n");
	    next;
	};
	/^$TBRELOADDONE$/ && do {
	    info("Clearing reload info for $node\n");
	    DBQueryFatal("delete from current_reloads where node_id='$node'");
	    my ($pid,$eid);
	    NodeidToExp($node,\$pid,\$eid);
	    if (($pid eq NODERELOADING_PID) && ($eid eq NODERELOADING_EID)) {
		DBQueryFatal("delete from scheduled_reloads ".
			     "where node_id='$node'");
		DBQueryFatal("delete from reserved where node_id='$node'");
		info("Released $node from $pid/$eid\n");
	    }
	    next;
	};
	/^$TBTIMEOUT$/ && do {
	    my $state = $nodes{$node}{state};
	    my $mode = $nodes{$node}{mode};
	    my ($timeout,$action);
	    if ($mode && $state && $timeouts{$mode} &&
		$timeouts{$mode}{$state}) {
		($timeout, $action) = @{$timeouts{$mode}{$state}};
	    }
	    notify("Node $node has timed out in state $mode/$state".
		   ($action ne "" ? "\n\tRequested action $action." : "").
508
		   "\n".`/home/newbold/z/bin/statetime | grep '$node\t'`);
509 510
	    next;
	};
511
	notify("$node: Unknown CtrlEvent: $event\n");
512 513
    }
}
Robert Ricci's avatar
Robert Ricci committed
514

515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533
#
# Check if we need to generate an ISUP
#
sub checkGenISUP($) {
    my ($node) = @_;
    info("$node: Checking ISUP Generation\n");
    my $r = DBQueryWarn("select osfeatures from os_info as o ".
			"left join nodes as n on o.osid=n.osid ".
			"where node_id='$node' and osfeatures is not null");
    my $osfeatures="";
    # If we don't get anything back, assume it has no features.
    if ($r->num_rows() > 0) { ($osfeatures) = $r->fetchrow(); }
   
    my @features = split(",",$osfeatures);
    # Make sure features I care about are defined
    my %can=("ping"=>0, "isup"=>0); 
    foreach my $f (@features) {
	$can{"\L$f"}=1; # make sure it's all lowercase
    }
Robert Ricci's avatar
Robert Ricci committed
534

535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594
    # If os will send ISUP on its own, do nothing here.
    if ($can{"isup"}) { return 0; }

    # If os doesn't support isup but can ping, fork and ping it every
    # 5 seconds and send isup when it pings, or timeout after too long.
    if ($can{"ping"}) {
	my $pid = fork();
	if ($pid) { return 0; } # don't wait, return and go on with life
	else {
	    debug("Forked process to ping $node\n");

	    my $wait=5; # 5 seconds between ping attempts
	    my $maxtime=600; # Set the timer for 10 minutes
	    
	    # XXX : If our maxtime is very different from os_setup's
	    #idea of how long a node should take to reboot, then we've
	    #got a problem, since it might reboot the nodes.

	    # Set an alarm in case it never comes up...
	    local $SIG{ALRM} = sub { 
		notify("$node: checkGenISUP timed out waiting ".
		       "for ping responses after $maxtime seconds.\n");
		exit(); 
	    };
	    
	    alarm $maxtime;

	    my $n=0;
	    while ( $n <= ($maxtime/$wait)) {
		my $rv=system("/sbin/ping -c 1 -t 1 $node > /dev/null") >> 8;
		if ($rv==0) {
		    # we got a response
		    debug("$node: ping response received... sending ISUP\n");
		    stateTransition($node, TBDB_NODESTATE_ISUP);
		    exit();
		} elsif ($rv==2) {
		    # no response
		    debug("No ping response, waiting $wait seconds...\n");
		} elsif ($rv==68) {
		    # ping: cannot resolve $node: Unknown host
		    notify("$node: ping couldn't resolve $node!\n");
		    exit();
		} else {
		    notify("$node: checkGenISUP ping returned $rv!\n");
		    exit();
		}
		sleep $wait;
		$n+=1;
	    }
	    notify("$node: Sent $n pings in ".($n*$wait)." seconds ".
		   "with no response.\n");
	    exit();
	}
    }
    # If os doesn't support ping or isup, stated sets it to ISUP at the
    # same time.
    
    debug("$node: OS doesn't ping - sending ISUP\n");
    stateTransition($node, TBDB_NODESTATE_ISUP);
    
Robert Ricci's avatar
Robert Ricci committed
595 596
}

597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625
#
# Figure out if this node belongs to us (ie. if it's using our database.)
# Returns 1 if it does, 0 if not
#
sub checkDBRedirect($) {

	my ($node) = @_;

	#
	# XXX: I don't want to do this every time, for performance reaons,
	# but we need to make sure that we don't get into an inconsistent 
	# state
	#
	my $result = DBQueryFatal("SELECT testdb FROM nodes as n " .
		"LEFT JOIN reserved as r ON n.node_id = r.node_id " .
		"LEFT JOIN experiments as e ON r.pid = e.pid " .
			"AND r.eid = e.eid " .
		"WHERE n.node_id = '$node'");

	if (!$result->num_rows()) {
		notify("Got an event for a node ($node) I don't know about\n");
		return 0;
	}

	my ($testdb) = $result->fetchrow();

	#
	# XXX: It's hokey to hardcode tbdb here, but....
	#
626 627

	#debug("checkDBRedirect: $node => $testdb (I'm $TBDBNAME)\n");
628 629 630 631 632 633 634 635
	if ((!$testdb && ($TBDBNAME eq "tbdb")) ||
	    ($testdb && ($testdb eq $TBDBNAME))) {
		return 1;
	} else {
		return 0;
	}
}

Robert Ricci's avatar
Robert Ricci committed
636 637 638 639
#
# Reload state from the database
#
sub reload() {
640
    	info("Reloading state from database\n");
641 642
	%nodes     = readStates(%nodes);
	%timeouts  = getTimeouts();
Robert Ricci's avatar
Robert Ricci committed
643
	%valid     = getValid();
644 645
	%modeTrans = getModeTrans();
	%triggers  = getTriggers();
Robert Ricci's avatar
Robert Ricci committed
646 647 648 649 650 651 652 653 654
}

sub debug(@) {
	if ($debug) { print @_; }
}

sub notify($) {
    	my $message = shift;
	if (!$debug) {
655 656 657
	    SENDMAIL("Stated List ".$TBOPS,
		     "Node State Daemon Messsage",$message,
		     "Stated Daemon ".$TBOPS);
658 659
	} else {
	    print "notify: Not sending mail in debug mode\n";
Robert Ricci's avatar
Robert Ricci committed
660
	}
661
	info($message,1);
662 663
}

664
sub info($;$) {
665
    my $message = shift;
666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689
    my $notice = shift || 0;
    if (!$debug) {
      # Use syslog
      my $prio="info";
      if ($notice) { $prio = "notice"; }
      syslog($prio,$message);
    } else {
      # Print out log entries like this:
      # Sep 20 09:36:00 stated[238]: Reloading state from database
      print strftime("%b %e %H:%M:%S",localtime)." stated[$$]: $message";
    }
}

# This gets called if we catch a signal USR1
sub restart {
  my $params = join(" ",@args);
  my $prog = "";
  # If we're started from an abosolute path, use that.
  if ($0 =~ /^\//) { $prog = $0; } else { $prog = "$TB/sbin/stated"; }
  info("SIGUSR1 received, restarting from '$prog".
       ($params ne "" ? " $params" : "")."'\n");
  if ($handle && event_unregister($handle) == 0) {
    warn "Unable to unregister with event system\n";
  }
690
  unlink $pidfile;
691 692 693 694 695 696 697 698 699 700 701
  if (!defined(sigprocmask(SIG_UNBLOCK, POSIX::SigSet->new(SIGUSR1,SIGHUP)))) {
    notify("sigprocmask: sig unblock failed! $?, $!\n");
    die("\n");
  }
  exec("$prog $params") or 
    do {
      my $msg = "Couldn't restart stated! cmd='$prog $params'\n".
	"Error: ($?) $!\n";
      notify($msg);
      die($msg);
    };
Robert Ricci's avatar
Robert Ricci committed
702 703
}

704 705
# This gets called if we catch a signal (TERM, etc.)
sub cleanup {
706 707 708
  info("Signal received, exiting\n");
  # now do the normal exit stuff in END {}
  exit(0);
709 710
}

Robert Ricci's avatar
Robert Ricci committed
711 712
# This gets called if we die of 'natural causes' (exit, die, etc.)
END {
713 714 715 716
  info("Exiting, cleaning up\n");
  unlink $pidfile;
  # clean up Syslog if we were using it.
  if (!$debug) { closelog(); }
717 718 719
  if ($handle) {
    if (event_unregister($handle) == 0) {
      die "Unable to unregister with event system\n";
720
    }
721
  }
Robert Ricci's avatar
Robert Ricci committed
722
}
723