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#!/usr/bin/perl -w
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#
# EMULAB-COPYRIGHT
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# Copyright (c) 2000-2003 University of Utah and the Flux Group.
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# All rights reserved.
#

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#
# stated - A daemon to monitor the states of nodes in the testbed. Recives
# state change notification through the event system, and writes the new
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# state into the database. Also watches for invalid transitions, timeouts, 
# and performs other state-related control functions.
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#
# Send it a HUP signal to get it to reload the timeout and transition
# information. Periodically reloads this information regardless, though.
#
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# Will restart when sent SIGUSR1, by exec'ing its executable again.
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#
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# Configure variables
use lib '@prefix@/lib';
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my $TB = "@prefix@";
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my $REALTB = "/usr/testbed"; # So we know if we're the "real" stated or not
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my $BOSSNODE = "@BOSSNODE@";
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my $TBOPS = "@TBSTATEDEMAIL@";
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my $REALTBOPS = "@TBOPSEMAIL@";
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my $TBDBNAME = "@TBDBNAME@";
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my $REALTBDBNAME = "tbdb"; # So we know if we're using the "real" db
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my $osselect = "$TB/bin/os_select";
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my $nodereboot = "$TB/bin/node_reboot";
my $power = "$TB/bin/power";
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my $TBLOG = "@TBLOGFACIL@";
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$| = 1;

use event;
use libdb;
use libtestbed;
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use TimeoutQueue;
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use Getopt::Std;
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#use strict;
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use English;
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use POSIX;			# for strftime, and sigprocmask and friends
use Fcntl;			# file constants for pidfile
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use Sys::Syslog;
# Important note about syslog: It defaults to using an inet socket,
# but 'syslogd -s' (the default) doesn't listen for one. So either
# run syslogd without -s, or use setlogsock('unix') before openlog.
# (To get setlocksock: 'use Sys::Syslog qw(:DEFAULT setlogsock);' )
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# Do lots of db retries before we fail and die
$libdb::DBQUERY_MAXTRIES = 5;

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# Set up some notification throttling
my $mailgap = 15;		# in seconds
my $lastmail = time() - $mailgap + 2; # Send a digest of startup msgs after 2s.
my %msgs = ();

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# 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.
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my $reload_time = 600;
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my $last_reload = time;
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# Process command-line arguments

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

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# Only root should run this - it won't work when run as a user...
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# (Or, let an admin run it if it isn't the real one in /usr/testbed/ )
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if ($UID && ( $TB eq $REALTB || ! TBAdmin($UID) ) ) {
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    die("Only root can run this script!\n");
}

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my @args = @ARGV;    # save a copy for restart before we mess with them.
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my %opt = ();
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getopts("ds:p:h",\%opt);
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if ($opt{h}) {
    exit &usage;
}
if (@ARGV) {
    exit &usage;
}
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my ($server,$port,$debug);
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if ($opt{s}) {
    $server = $opt{s};
} else {
    $server = $BOSSNODE;
}
if ($opt{p}) {
    $port = $opt{p};
}
if ($opt{d}) {
    $debug = 1;
} else {
    $debug = 0;
}
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# Grab some constants into variables
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my $TBANYMODE    = TBDB_NODEOPMODE_ANY;
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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;
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my $TBCONTROL    = TBDB_TBEVENT_CONTROL;
my $TBCOMMAND    = TBDB_TBEVENT_COMMAND;
my $TBREBOOT     = TBDB_COMMAND_REBOOT;
my $TBPOWEROFF   = TBDB_COMMAND_POWEROFF;
my $TBPOWERON    = TBDB_COMMAND_POWERON;
my $TBPOWERCYCLE = TBDB_COMMAND_POWERCYCLE;
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my $TBISUP       = TBDB_NODESTATE_ISUP;
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my $TBTIMEOUTREBOOT   = TBDB_STATED_TIMEOUT_REBOOT;
my $TBTIMEOUTNOTIFY   = TBDB_STATED_TIMEOUT_NOTIFY;
my $TBTIMEOUTCMDRETRY = TBDB_STATED_TIMEOUT_CMDRETRY;
my $TB_OSID_MBKERNEL  = TB_OSID_MBKERNEL;
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# This only gets used here, so it isn't in a lib constant.
my $TBFREENODE = "FREENODE";

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my $pidfile;
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if ( $TB eq $REALTB ) {
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    $pidfile = "/var/run/stated.pid";
} else {
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    $pidfile = "$TB/locks/stated.pid";
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}
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debug("Using pidfile $pidfile\n");
if (-e $pidfile) {
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    my $otherpid = `cat $pidfile`;
    my $running = `ps -auxww | grep $otherpid | grep -v grep`;
    if ($running ne "") {
	fatal("Lockfile $pidfile exists, and process $otherpid appears to be ".
	      "running.\n");
    } else {
	notify("Lockfile exists, but process $otherpid appears to be dead.\n".
	       "Removing lock file...\n");
    }
    system("rm $pidfile") &&
      fatal("Couldn't remove $pidfile: $? $!\n");
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}
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# Background
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if (!$debug) {
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    # We use syslog, so redirect the output to nothing
    if (TBBackGround("/dev/null")) {
	exit(0);
    }
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}
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# set up syslog
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openlog("stated","pid",$TBLOG);
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sysopen(PIDFILE, $pidfile, O_WRONLY | O_EXCL | O_CREAT) ||
  fatal("Couldn't create '$pidfile': $? $!\n");
print PIDFILE "$$";
close PIDFILE;
# If I make it to here, I'll need to clean up the lock file
my $lockfile=$pidfile;
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# Change my $0 so that it is easier to see in a ps/top
$0 = "$0";

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my $URL = "elvin://$server";
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if ($port) {
    $URL .= ":$port";
}
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# Connect to the event system, and subscribe the the events we want 
my $handle = event_register($URL,0);
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if (!$handle) {
    fatal("Unable to register with event system\n");
}
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my $tuple = address_tuple_alloc();
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if (!$tuple) {
    fatal("Could not allocate an address tuple\n");
}
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%$tuple = ( objtype => join(",",
			    $TBNODESTATE, $TBNODEOPMODE,
			    $TBCONTROL, $TBCOMMAND) );
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if (!event_subscribe($handle,\&handleEvent,$tuple)) {
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    fatal("Could not subscribe to events\n");
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}

# Read in the pre-existing node states, and timeout and valid transition
# information from the database
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my %timeouts  = getTimeouts();
my %valid     = getValid();
my %modeTrans = getModeTrans();
my %triggers  = getTriggers();
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my %nodes     = readStates();
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my %timeouttag= ();
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if ($debug) { qshow(); }
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# Gets set if a reload of state from the database should happen.
my $do_reload = 0;
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my $sigrestart= 0;
my $sigcleanup= 0;
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# Make the daemon reload database state on a sighup - but I'm worried
# about what would happen if we tried to do this mid-loop. So, we'll
# just set a flag and do it when we're done with our current pass.
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$SIG{HUP}  = sub { info("SIGHUP - Reloading DB state\n"); $do_reload = 1; };

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# Set up other signals.
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$SIG{USR1} = \&restart_wrap;
$SIG{USR2} = \&cleanup_wrap;
$SIG{INT}  = \&cleanup_wrap;
$SIG{QUIT} = \&cleanup_wrap;
$SIG{ABRT} = \&cleanup_wrap;
$SIG{TERM} = \&cleanup_wrap;
$SIG{KILL} = \&cleanup_wrap;
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# Track if I handled an event or not
my $event_count = 0;

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# Control how long I block while waiting for events
my $blockwait=0;
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my $nextdeadline=0;
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my $mailqueue=0;

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notify("Stated starting up\n");

sub process_event_queue() {
    $event_count=0;
    my $lastcount=-1;
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    my $wait;
    my $now = time();
    debug("Polling - mq=$mailqueue bw=$blockwait\n");
    if ( $mailqueue == 0) {
	# no messages waiting...
	if ($blockwait) {
	    # we can wait a long time - nothing else will happen
	    # until we get an event, or get woken up by a signal
	    $wait = 600;
	} else {
	    # only wait until the next deadline...
	    if ($nextdeadline > 0) {
		$wait = $nextdeadline - $now;
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	    } else {
		$wait = 0;
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	    }
	}
    } else {
	# mail is waiting. Only block until it is time to send it.
	$wait = $lastmail + $mailgap - $now;
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	debug("Now $now, mailgap $mailgap, last $lastmail ==> wait $wait\n");
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    }
    if ($wait < 0) { debug("Wait was $wait!\n"); $wait=0; }
    my $finish = $now + $wait;
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    while (($event_count != $lastcount || $wait > 0) &&
	   !($sigrestart || $sigcleanup || $do_reload)) {
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	$lastcount = $event_count;
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	# Don't block if we got a signal!
	if ($wait<=0 || $sigrestart || $sigcleanup || $do_reload) {
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	    event_poll($handle);
	} else {
	    debug("Using blocking event poll - $wait seconds\n");
	    # timeout param is in milliseconds, so multiply
	    event_poll_blocking($handle, $wait*1000);
	    $now = time();
	    # subtract seconds elapsed from my wait time
	    $wait = $finish - $now;
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	    debug("Finished blocking event poll - $wait seconds remain\n");
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	    if ($event_count > 0 &&
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		(qsize() > 0 || $mailqueue ||
		 $sigrestart || $sigcleanup || $do_reload)) {
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		$blockwait=0;
		$wait=0;
		#debug("Cancelling wait - timeouts/msgs waiting, or HUP'd\n");
		#debug("---End Blocking Wait ---\n");
	    }
	}
	#debug("Wait is $wait\n");
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    }
    if ($event_count > 0) {
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	debug("Handled $event_count event(s).\n");
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    }
}
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# Now, we just poll for events, and watch for timeouts
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while (1) {
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    my $now = time();
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    my ($deadline,$node);

    # Check for nodes that have passed their timeout
    if (!qhead($deadline,$node)) {
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	info("HEAD: $node in ".($deadline-$now).", queue=".qsize()."\n");
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	while ($now >= $deadline && $node ne "") {
	    qpop($deadline,$node);
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	    info("POP: $node in ".($deadline-$now).", queue=".qsize()."\n");
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	    handleCtrlEvent($node,$TBTIMEOUT);
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	    if (0) { qshow(); }
	    if (qhead($deadline,$node)) {
		$deadline=0; $node="";
	    }
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	}
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    } else {
	$deadline=0;
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    }
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    $nextdeadline = $deadline;
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    if (qsize()==0) {
	$blockwait=1;
	debug("---Blocking wait okay---\n");
    }
		
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    if ($do_reload || ($now - $last_reload > $reload_time)) {
	reload();
	$do_reload = 0;
    }
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    # Send any messages in the queue if it is time
    notify("",1);
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    if ($sigrestart) { restart(); }
    if ($sigcleanup) { cleanup(); }

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    process_event_queue;
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}

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exit(0);

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

    # Guard against undefined variable warnings
    if (! defined(%oldnodes)) {
	%oldnodes = ();
    }
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    #debug("readStates called\n");
    my $result = DBQueryFatal("SELECT node_id, eventstate, " .
			      "state_timestamp, op_mode, " .
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			      "op_mode_timestamp FROM nodes ".
			      "where node_id not like 'sh%'");
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    my %nodes;
    while (my ($node_id, $state, $timestamp, $mode, $mode_timestamp)
	   = $result->fetchrow()) {
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	#
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	# If there's an entry in oldnodes for this node, and it
	# hasn't changed state or time, use the old entry (so that
	# we don't lose information about which nodes we've already
	# notified the ops about, etc.)
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	#
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	if ($oldnodes{$node_id} && $state && $timestamp &&
	    ($oldnodes{$node_id}{state} eq $state) &&
	    ($oldnodes{$node_id}{mode} eq $mode) &&
	    ($oldnodes{$node_id}{timestamp} == $timestamp)) {
	    $nodes{$node_id} = $oldnodes{$node_id};
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	} else {
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	    $nodes{$node_id}{state}          = $state;
	    $nodes{$node_id}{timestamp}      = $timestamp;
	    $nodes{$node_id}{mode}           = $mode;
	    $nodes{$node_id}{mode_timestamp} = $mode_timestamp;
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	    $nodes{$node_id}{notified}       = 0;
	    $nodes{$node_id}{timedout}       = 0;
	    $nodes{$node_id}{noretry}        = 0;
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	    # Is there a timeout? If so, set it up!
	    setTimeout($mode,$state,$node_id,$timestamp);
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	}
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    }
    return %nodes;
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}

#
# Read timeouts for various states from the database
#
sub getTimeouts() {
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    #debug("getTimeouts called\n");
    my $result = DBQueryFatal("SELECT op_mode, state, timeout, action " .
			      "FROM state_timeouts");
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    my %timeouts;
    while (my ($op_mode, $state, $timeout, $action) = $result->fetchrow()) {
	$timeouts{$op_mode}{$state} = [ $timeout, $action ];
    }
    return %timeouts;
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}

#
# Read the list of valid state transitions from the database
#
sub getValid() {
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    #debug("getValid called\n");
    my $result = DBQueryFatal("SELECT op_mode, state1, state2 " .
			      "FROM state_transitions");
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    my %valid;
    while (my ($mode,$state1, $state2) = $result->fetchrow()) {
	$valid{$mode}{$state1}{$state2} = 1;
    }
    return %valid;
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}

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#
# Read the list of valid mode transitions from the database
#
sub getModeTrans() {
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    #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;
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	}
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    }
    return %modeTrans;
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}

#
# Read the list of states which trigger an action
#
sub getTriggers() {
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    debug("getTriggers called\n");
    
    debug("anymode ==> '$TBANYMODE'\n");

    # Grab global triggers
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    my $result = 
      DBQueryFatal("SELECT op_mode, state, trigger " .
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		   "FROM state_triggers where node_id='$TBANYMODE' ".
		   "order by op_mode,state");
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    my %t;
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    while (my ($mode, $state, $trig) = $result->fetchrow()) {
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	$t{"$mode:$state"} = $trig;
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	debug("trig($mode:$state)\t => $trig\n");
    }

    # Grab per-node triggers
    $result = 
      DBQueryFatal("SELECT node_id, op_mode, state, trigger " .
		   "FROM state_triggers where node_id!='$TBANYMODE' ".
		   "order by op_mode,state");
    while (my ($n, $mode, $state, $trig) = $result->fetchrow()) {
	my @trigs = split(/\s*,\s*/,$trig);
	$t{"$n:$mode:$state"} = \@trigs;
	debug("trig($n:$mode:$state)\t => ".join(',',@trigs)."\n");
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    }
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    return %t;
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}

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#
# Gets called for every event that we recieve
#
sub handleEvent($$$) {
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    my ($handle,$notification,$data) = @_;
    my $objtype = event_notification_get_objtype($handle,$notification);
    my $objname = event_notification_get_objname($handle,$notification);
    my $eventtype = event_notification_get_eventtype($handle,$notification);

    $event_count++;
    debug("Got an event: ($objtype,$objname,$eventtype)\n");

    #
    # Check to see if another instance is supposed to be handling this node
    #
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    if ($objtype ne $TBCOMMAND && !checkDBRedirect($objname)) {
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	info("Got an event for node $objname, which isn't mine\n");
	return;
    }
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  SWITCH: for ($objtype) {
	
	(/$TBNODESTATE/) && do {
	    stateTransition($objname,$eventtype);
	    last;
	};
	(/$TBNODEOPMODE/) && do {
	    opModeTransition($objname,$eventtype);
	    notify("Use of deprecated event TBNODEOPMODE:\n".
		   "$objname->$eventtype\n");
	    last;
	};
	(/$TBCONTROL/) && do {
	    handleCtrlEvent($objname,$eventtype);
	    last;
	};
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	(/$TBCOMMAND/) && do {
	    handleCommand($objname,$eventtype);
	    last;
	};
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    }
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}

sub stateTransition($$) {

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    my ($node,$newstate) = @_;
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    # 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();
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	if ($nodes{$node}) {
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	    $oldstate = $nodes{$node}{state};
	    $mode = $nodes{$node}{mode};
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	} else {
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	    notify("Got an event for a node ($node) I don't know about\n");
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	}
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    }
    if ($oldstate && $mode && $valid{$mode} && $valid{$mode}{$oldstate} &&
	!$valid{$mode}{$oldstate}{$newstate}) {
	notify("Invalid transition for node $node from $mode/$oldstate " .
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	       "to $newstate\n");
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    }
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    my $now = time();
    $nodes{$node}{state}     = $newstate;
    $nodes{$node}{timestamp} = $now;
    $nodes{$node}{notified}  = 0;
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    info("$node: $mode/$oldstate => $mode/$newstate\n");
    DBQueryFatal("UPDATE nodes SET eventstate='$newstate', " .
		 "state_timestamp='$now' WHERE node_id='$node'");
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    # Before we set the timeout (overwriting any current ones), we need
    # to check if we had a pending command
    if (qfind($node) &&
	$timeout_tag{$node} =~ /^$TBCOMMAND:/) {
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        debug("TimeoutTag = '$timeout_tag{$node}'\n");
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	my ($str,$cmd) = split(":",$timeout_tag{$node});
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	debug("str=$str\tcmd=$cmd\tTBREBOOT=$TBREBOOT\tstate=$newstate\n");
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	if ($cmd eq $TBREBOOT) {
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	    if ($newstate eq TBDB_NODESTATE_SHUTDOWN ) {
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		info("$node: $TBREBOOT success\n");
		# Timeout will get cleared below by setTimeout call
	    } else {
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		notify("$node: $TBREBOOT in progress, but got state ".
		       "$newstate instead of ".TBDB_NODESTATE_SHUTDOWN."!\n");
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	    }
	#} elsif ($cmd eq $FOO ) {
	    # Add more here...
	} else {
	    notify("$node: Unknown command timeout '$timeout_tag{$node}' ".
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		   "found at $mode/$newstate\n");
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	}
    }

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    # Check if this state has a timeout, and if so, put it in the queue
    setTimeout($mode,$newstate,$node,$now);

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    # Check if this is TBDB_NODESTATE_BOOTING , which has actions
    if ($newstate eq TBDB_NODESTATE_BOOTING) {
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	# If I skipped shutdown, and came to booting directly from isup,
	# check for a mode transition so I don't miss one...
	if ($oldstate eq TBDB_NODESTATE_ISUP) {
	    info("$node: Came from ISUP! Checking for mode transition\n");
	    my $r = DBQueryWarn("select next_op_mode from nodes ".
				"where node_id='$node'");
	    my ($nextmode) = $r->fetchrow();
	    if ($nextmode) {
		# Force the transition even though it is illegal
		info("$node: Forcing mode transition!\n");
		opModeTransition($node,$nextmode,1);
		$mode=$nextmode;
	    } else {
		debug("No next mode.\n");
	    }
	}

	# Check if I'm in the right mode
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	my $osid = TBBootWhat($node,$debug);
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	my $os_op_mode = os_opmode($osid);
	info("$node: Current OS is '$osid', OS mode is '$os_op_mode'\n");
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	DBQueryFatal("UPDATE nodes SET osid='$osid' WHERE node_id='$node'");
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	if ($os_op_mode ne $mode) {
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	    my $str = "Node $node is running OS '$osid' but in mode '$mode' ".
	      "instead of mode '$os_op_mode'!\n";
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	    # For now, only force if we're going into reload mode, so we
	    # don't get stuck looping in reloading.
	    if ($os_op_mode eq "RELOAD") {
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		DBQueryFatal("UPDATE nodes SET op_mode='$os_op_mode', ".
			     "op_mode_timestamp=unix_timestamp(now()) ".
			     "WHERE node_id='$node'");
		$nodes{$node}{mode} = $os_op_mode;
		$nodes{$node}{mode_timestamp} = $now;
		$str .= "Forced op_mode to '$os_op_mode'.\n";
	    }
	    notify($str);
	}
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	checkGenISUP($node);
    }
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    # Check if this state has any triggers
    my @nodetrigs = GetNodeTriggerList($node,$mode,$newstate);
    if (defined($triggers{"$mode:$newstate"}) ||
        (@nodetrigs > 0) ) {
	# check for global triggers
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	my @trigs = split(/\s*,\s*/,$triggers{"$mode:$newstate"});
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	# Run all the triggers
	debug("Running triggers. Global=".join("/",@trigs).
	      "   node=".join("/",@nodetrigs)."\n");
	foreach ( @trigs , @nodetrigs) {
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	    my $trig = $_;
	    /^$TBRESET$/ && do {
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		# We successfully booted, so clear some flags
		$nodes{$node}{noretry}   = 0;
		$nodes{$node}{timedout}  = 0;
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		# 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,$trig);
		next;
	    };
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	    /^$TBFREENODE$/ && do {
		handleCtrlEvent($node,$trig);
		next;
	    };
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	    /^$TBISUP$/ && do {
		info("$node: Triggered $TBISUP\n");
		EventSendWarn(host      => $BOSSNODE ,
			      objtype   => TBDB_TBEVENT_NODESTATE ,
			      eventtype => TBDB_NODESTATE_ISUP ,
			      objname   => $node);
		next;
	    };
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	    notify("Unknown trigger '$trig' for $node in $mode/$newstate!\n");
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	}
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	# Clear any of the node triggers that we ran
	debug("Clearing node triggers: ".join("/",@nodetrigs)."\n");
	ClearNodeTrigger($node,$mode,$newstate,@nodetrigs);
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    }
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    # Check if this state can trigger a mode transition
    if (defined($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);
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	} else {
	    debug("No next mode.\n");
	}
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    }
}
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sub opModeTransition($$;$) {
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    my ($node,$newmode,$force) = @_;
    if (!defined($force)) { $force = 0; }
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    info("$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 ($node) I don't know about\n");
	}
    }
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    if (defined($modeTrans{"$mode:$oldstate"}) || $force) {
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	if (!$force) {
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	    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 for $node from ".
		       "$mode/$oldstate to $newmode!\n");
	    }
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	}
    } else {
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	notify("Invalid mode transition for $node from $mode/$oldstate: ".
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	       "Not a valid mode transition state!\n");
    }
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    if (!$nextstate) {
	$nextstate=$oldstate;
    }
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    my $now = time();
    $nodes{$node}{state}     = $nextstate;
    $nodes{$node}{timestamp} = $now;
    $nodes{$node}{mode}           = $newmode;
    $nodes{$node}{mode_timestamp} = $now;
    $nodes{$node}{notified}       = 0;
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    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='$node'");
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    # Check if this state has a timeout, and if so, put it in the queue
    setTimeout($newmode,$nextstate,$node,$now);

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}

sub handleCtrlEvent($$) {
    my ($node,$event) = @_;
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    info("CtrlEvent: $node, $event\n");
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    foreach ($event) {
	/^$TBRESET$/ && do {
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	    my $result = DBQueryFatal("SELECT pxe_boot_path, def_boot_osid ".
				      "FROM nodes where node_id='$node'");
	    my ($pxepath,$osid) = $result->fetchrow();
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	    # Important note on ordering here:
	    # Because setting a normal osid resets pxe path to PXEBOOT,
	    # We need to read it out first, then set the osid, then set
	    # the pxepath back to its original value at the end.
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	    $cmd = "$osselect $osid $node";
	    system($cmd) and
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	      notify("$node/$event: Couldn't clear next_boot_*\n".
		     "\tcmd=$cmd\n\t*** $!\n");
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	    $pxepath = "-p ".$pxepath;
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	    if ($pxepath eq "-p ") {
		$pxepath="PXEBOOT";
	    }
	    ;
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	    my $cmd = "$osselect -m $pxepath $node";
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	    system($cmd) and
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	      notify("$node/$event: Couldn't clear next_pxe_boot_path\n".
		     "\tcmd=$cmd\n\t*** $!\n");
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	    info("Performed RESET for $node to $osid/$pxepath\n");
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	    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'");
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		AddNodeTrigger($node, $TBANYMODE, TBDB_NODESTATE_ISUP,
			       $TBFREENODE)
		  && notify("$node: Couldn't add trigger $TBFREENODE!\n");
		info("Set up freeing of $node from $pid/$eid\n");
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	    }
	    next;
	};
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	/^$TBFREENODE$/ && do {
	    # Don't need pid/eid, but we should put it in the log
	    my ($pid,$eid);
	    NodeidToExp($node,\$pid,\$eid);
	    DBQueryFatal("delete from reserved where node_id='$node'");
	    info("Released $node from $pid/$eid\n");
	    next;
	};
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	/^$TBTIMEOUT$/ && do {
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	    my ($mode,$state) = split(":",$timeout_tag{$node});
	    delete($timeout_tag{$node});
	    my $curstate = $nodes{$node}{state};
	    my $curmode = $nodes{$node}{mode};
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	    my ($timeout,$action);
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	    if (!defined($nodes{$node}{notified})) {
		$nodes{$node}{notified}=0;
	    }
	    $nodes{$node}{notified}++;
	    my $notified = $nodes{$node}{notified};
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	    $nodes{$node}{timedout}++;
	    my $timedout = $nodes{$node}{timedout};
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	    if ($mode && $state && $timeouts{$mode} &&
		$timeouts{$mode}{$state}) {
		($timeout, $action) = @{$timeouts{$mode}{$state}};
	    }
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	    if ($mode eq $TBCOMMAND) {
		# It is a command, not a true state
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		if ($action eq $TBTIMEOUTCMDRETRY) {
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		    # Retry the command
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		    notify("$node: Command $state, retry #$timedout\n");
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		    # notify in case we get in a retry loop...
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		    handleCommand($node,$state,$timedout,1);
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		} else {
		    notify("$node: Unknown timeout action for ".
			   "$mode/$state: '$action'\n");
		}
		next;
	    }
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	    info("Node $node has timed out in state $mode/$state".
		 ($action ne "" ? "\n\tRequested action $action." : "").
		 "\n");

	    foreach ($action) {
		/^$TBTIMEOUTREBOOT/ && do {
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		    if ($timedout>3) {
			# We've tried too many times...
			notify("Node $node has timed out too many times!\n".
			       "Giving up until it boots sucessfully.\n");
			$nodes{$node}{noretry} = 1;
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		    } else {
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			# XXX Temporary!  For now notify instead of
			# really rebooting, until the timeout/retry
			# stuff is gone from os_setup and os_load
			notify("Node $node has timed out in state ".
			       "$mode/$state - REBOOT requested\n");
			#handleCommand($node,$TBREBOOT,$timedout,1);
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		    }
		    last; };
		/^$TBTIMEOUTNOTIFY/ && do {
		    notify("Node $node has timed out in state $mode/$state\n");
		    last; };
		notify("$node: Unknown Timeout Action: $action\n");
	    }
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	    next;
	};
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	notify("$node: Unknown CtrlEvent: $event\n");
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    }
}
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sub handleCommand($$;$$) {
    my ($params,$command,$retry,$force) = @_;
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    if (!defined($retry)) { $retry=0; }
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    if (!defined($force)) { $force=0; }
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    info("Command: $params, $command (attempt $retry)\n");

    # XXX - Right now we skip the checkDBRedirect calls for our
    # TBCOMMAND events, since they may have a list of nodes in them.
    # We may need to do it here (while iterating over the list), or
    # make some other fix up in handleEvent.

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    if ($command eq $TBREBOOT && $retry >=4) {
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	announce("Node $params has tried rebooting $retry times and has \n".
		 "still not been successful. Please look into it soon.\n".
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	"" );#	 "In the meantime, $params will be powered off.\n");
	# Just return...
	return 0;
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	# change my command to poweroff.
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	#$command = $TBPOWEROFF;
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    }

    foreach ($command) {
	/^$TBREBOOT$/ && do {
	    # For reboot, the params is a comma-separated list of nodes
	    my @nodes = split(",",$params);
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	    # Check if any of these are in the middle of things and
	    # shouldn't be rebooted.
	    if (!$force) {
		foreach $n ( 0 .. $#nodes ) {
		    $node = $nodes[$n];
		    debug("Checking rebooting: $node, $nodes{$node}, ".
			  "$nodes{$node}{state}, $nodes{$node}{noretry}\n");
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		    if (($nodes{$node}{state} ne TBDB_NODESTATE_ISUP) &&
			(!$nodes{$node}{noretry}) ) {
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			# This node shouldn't be rebooted now...
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			# XXX Send feedback here somehow!

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			info("$node: Trying to reboot too soon! Skipping.\n");
			# Cut it out of the list
			debug("Nodelist before ==> ".join(" ",@nodes)."\n");
			splice(@nodes,$n,1);
			debug("Nodelist after  ==> ".join(" ",@nodes)."\n");
		    }
		}
		if (@nodes == 0) { next; }
	    }

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	    my $nodelist=join(" ",@nodes);
	    info("Rebooting nodes: $nodelist\n");
	    # Permissions were checked in order to send the message,
	    # so we don't need to do any fancy stuff here.

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	    my $cmd = "$nodereboot -r $nodelist";
	    my $redir = " 2>&1 >> /usr/testbed/log/nodereboot.log &";
	    debug("$cmd $redir\n");
	    system("date $redir");
	    system($cmd.$redir) and
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	      notify("$params/$command: ".
		     "Command '$cmd' failed, error $?: $!\n");

	    # Set up a timeout, so we retry if we don't get SHUTDOWN in time
	    foreach $node (@nodes) {
		# Note: This will replace any state timeouts currently in
		# the queue. But here that's okay because we're expecting
		# to see another transition really soon anyway.
		setTimeout($TBCOMMAND,$command,$node,time());
	    }

	    info("Performed $command for $params\n");
	    next;
	};
	(/^$TBPOWEROFF$/ || /^$TBPOWERON$/ || /^$TBPOWERCYCLE$/) && do {
	    # For power, the params is a comma-separated list of nodes
	    my @nodes = split(",",$params);
	    my $nodelist=join(" ",@nodes);
	    my %funcmap = ( $TBPOWERCYCLE => "cycle",
			    $TBPOWERON    => "on",
			    $TBPOWEROFF   => "off");
	    my $func = $funcmap{$command};
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	    info("Sending power $func for nodes: $nodelist\n");
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	    # Permissions were checked in order to send the message,
	    # so we don't need to do any fancy stuff here.

	    my $cmd = "$power $func $nodelist &";
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	    debug("$cmd\n") and
	    system($cmd) and
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	      notify("$params/$command: ".
		     "Command '$cmd' failed, error $?: $!\n");

	    info("Performed $command for $params\n");
	    next;
	};
	notify("$params: Unknown Command: $command\n");
    }
}

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#
# Check if we need to generate an ISUP
#
sub checkGenISUP($) {
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    my ($node) = @_;
    debug("$node: Checking ISUP Generation\n");
    my $r = DBQueryWarn("select osfeatures from nodes as n ".
			"left join os_info as o on o.osid=n.osid ".
			"where node_id='$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) = $r->fetchrow();
    }
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    my @features = split(",",$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
    }
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    # If os will send ISUP on its own, do nothing here.
    if ($can{"isup"}) {
	debug("$node: Will send own ISUP\n"); 
	return 0;
    }
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    # If os doesn't support isup but can ping, fork and ping it every
    # few seconds and send isup when it pings, or timeout after too long.
    if ($can{"ping"}) {
	debug("$node: Needs to be pinged - calling eventping\n");
	system("$TB/sbin/eventping $node &");
	return 0;
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    }
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    # If os doesn't support ping or isup, stated sends ISUP just after 
    # the node gets to BOOTING (a bit early, but the best we can do)

    debug("$node: OS doesn't ping - sending ISUP\n");
    EventSendWarn(host      => $BOSSNODE ,
		  objtype   => TBDB_TBEVENT_NODESTATE ,
		  eventtype => TBDB_NODESTATE_ISUP ,
		  objname   => $node);
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}

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# 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($) {

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    my ($node) = @_;
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    # 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'");
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    if (!$result->num_rows()) {
	notify("Got an event for a node ($node) I don't know about\n");
	return 0;
    }
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    my ($testdb) = $result->fetchrow();
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    # XXX: It's hokey to hardcode tbdb here, but....

    #debug("checkDBRedirect: $node => $testdb (I'm $TBDBNAME)\n");
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    if ((!$testdb && ($TBDBNAME eq $REALTBDBNAME)) ||
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	($testdb && ($testdb eq $TBDBNAME))) {
	return 1;
    } else {
	return 0;
    }
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}

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# Check if this state has a timeout, and if so, put it in the queue
sub setTimeout( $$$$ ) {
    my ($mode,$state,$node,$now) = @_;
    if (0) { print "Original: ($mode,$state,$node,$now)\n"; qshow(); }
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    if (defined(qfind($node))) { qdelete($node); delete($timeout_tag{$node}); }
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    if (0) { print "Deleted:\n"; qshow(); }
    if (defined($mode) && defined($state) &&
	defined($timeouts{$mode}) &&
	defined($timeouts{$mode}{$state})) {
	my $deadline = ${$timeouts{$mode}{$state}}[0];
        if (defined($deadline) &&
	    $deadline != $TBNOTIMEOUT) {
	    my $TO = $deadline + $now;
	    debug("Setting timeout for ($node,$mode,$state) at ".
		  "$deadline + $now ($TO)\n");
	    qinsert($TO,$node);
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	    $timeout_tag{$node} = "$mode:$state";
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	    if (0) { qshow(); }
	}
    }
    if (0) { print "Done:\n"; qshow(); }
}

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# Reload state from the database
sub reload() {
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    debug("Reloading state from database\n");
    $last_reload = time();
    %timeouts  = getTimeouts();
    %valid     = getValid();
    %modeTrans = getModeTrans();
    %triggers  = getTriggers();
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    %nodes     = readStates(%nodes);
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}

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#
# Some functions for node triggers
#

# $rv   = AddNodeTrigger($node, $mode, $state, @triglist);
sub AddNodeTrigger( $$$@ ) {
    my ($node, $mode, $state, @trigs) = @_;
    if (@trigs == 0) { return 1; }
    if (defined($triggers{"$node:$mode:$state"})) {
	my %t = ();
	foreach $k (@{$triggers{"$node:$mode:$state"}}) { $t{$k} = 1; }
	my @newtrigs = ();
	foreach $k (@trigs) { if (!defined($t{$k})) { push(@newtrigs,$k); } }
	push(@{$triggers{"$node:$mode:$state"}},@newtrigs);
    } else {
	$triggers{"$node:$mode:$state"} = \@trigs;
    }
    my $triglist = join(",",@{$triggers{"$node:$mode:$state"}});
    DBQueryFatal("replace into state_triggers ".
		 "(node_id,op_mode,state,trigger) values ".
		 "('$node','$mode','$state','$triglist')");
    return 0;
}

# @list = GetNodeTriggerList($node, $mode, $state);
sub GetNodeTriggerList( $$$ ) {
    my ($node, $mode, $state) = @_;
    my @l = ();
    if (defined($triggers{"$node:$mode:$state"})) {
	push(@l,@{$triggers{"$node:$mode:$state"}});
    }
    if (defined($triggers{"$node:$TBANYMODE:$state"})) {
	push(@l,@{$triggers{"$node:$TBANYMODE:$state"}});
    }
    return @l;
}

# $rv   = ClearNodeTrigger($node, $mode, $state, @triglist);
# Note: When not clearing all triggers, ordering is not preserved!
sub ClearNodeTrigger( $$$ ; @ ) {
    my ($node, $mode, $state, @trigs) = @_;
    # We have to keep any triggers that aren't on the list, but the
    # most common case will be that the list they give us is the whole
    # list anyway. So treat that case special.
    my @reallist = GetNodeTriggerList($node,$mode,$state);
    # empty list means clear all...
    if ((@trigs==0) || join(",",sort @reallist) eq join(",",sort @trigs)) {
	# Same list... just nuke the entry
	debug("Clearing all triggers for $node...\n");
	delete($triggers{"$node:$mode:$state"});
	delete($triggers{"$node:$TBANYMODE:$state"});
	DBQueryFatal("delete from state_triggers ".
		     "where node_id='$node' and state='$state' and ".
		     "(op_mode='$mode' or op_mode='$TBANYMODE')");
    } else {
	# Subtract @trigs from @reallist
	my %temptrigs = ();
	foreach $k (@reallist) { $temptrigs{$k} = 1; }
	debug("Reallist = ".join("/",@reallist).", trigs=".
	      join("/",@trigs).".\n");
	foreach $t (@trigs) {
	    if (defined($temptrigs{$t})) {
		delete($temptrigs{$t});
		debug("Clearing $t\n");
	    }
	}
	# Note: This doesn't quite do the right thing with triggers
	# for a fixed mode vs TBANYMODE. So if you start using this
	# code, make sure and debug it first!
	my @newtrigs = keys %temptrigs;
	debug("Newlist = ".join("/",@newtrigs).".\n");
	delete($triggers{"$node:$mode:$state"});
	if (@newtrigs > 0) {
	    AddNodeTrigger($node,$mode,$state,@newtrigs);
	} 
    }

    return 0;
}

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sub os_opmode() {
    my $osid = shift || "";
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    if ($osid eq $TB_OSID_MBKERNEL) {
	return "MINIMAL";
    }
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    my $cmd = "select op_mode from os_info where osid='$osid';";
    my $q = DBQueryFatal($cmd);
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    if ($q->numrows() < 1) {
	return "";
    }
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    my @r = $q->fetchrow_array();
    my $opmode=$r[0];
    debug("OpMode for '$osid' is '$opmode'\n");
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    if (defined($opmode) && $opmode ne "") {
	return $opmode;
    }
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    return "";
}
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#
# Functions for controlling output/logging, and signal handling
#

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

sub fatal($) {
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    my $msg = shift;
    notify($msg);
    die($msg);
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}

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sub showqueue() {
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    if ($debug < 2) {
	return;
    }
    if ((keys %msgs) > 0) {
	debug("\nMAILQUEUE:\n");
    }
    foreach $k (sort keys %msgs) {
	my @l = @{$msgs{$k}};
	debug("MSGS:\n$k==> (".(@l+0).",'".join("','",@l)."')\n");
    }
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}

sub notify($;$) {
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    my $message = shift;
    my $checkonly = shift || 0;
    # Use a timestamp, now that we're throttling mail
    my $tstamp=strftime("%b %e %H:%M:%S",localtime);
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    showqueue();
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    if (!$checkonly) {
	info($message);
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	$mailqueue++;
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	# Queue up the message
	# (The queue is a hash of lists of timestamps, keyed by message
	if (defined($msgs{$message})) {
	    push(@{$msgs{$message}},$tstamp);
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	} else {
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	    $msgs{$message} = [$tstamp];
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	}
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	showqueue();
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    }
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    my $now = time;
    if ($now - $lastmail >= $mailgap) {
	if ((keys %msgs)>0) {
	    debug("SENDING MAILQUEUE\n"."(now $now, lastmail $lastmail, ".
		  ($now-$lastmail).">=$mailgap)\n");
	    my $mailbody="";
	    my $sep = '-'x5;
	    # We're okay to send. Make a digest of all the queued messages.
	    foreach my $msg (sort keys %msgs) {
		my @tlist = @{$msgs{$msg}};
		my $count = 0+@tlist;
		$mailbody .= "\n$msg\n";
		if ($count > 1) {
		    my $first = shift @tlist;
		    my $last = pop @tlist;
		    $mailbody .= "($count copies from $first to $last)\n";
		} else {
		    $mailbody .= "($count copy at $tlist[0])\n";
		}
		$mailbody .= "$sep\n";
	    }
	    # Now reset the mail queue
	    %msgs = ();
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	    $mailqueue=0;
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	    showqueue();
	    $lastmail = time;
	    if (!$debug) {
		SENDMAIL("Stated List <".$TBOPS.">",
			 "Stated Messsage",$mailbody,
			 "Stated Daemon <".$TBOPS.">");
	    } else {
		debug("notify: Not sending mail in debug mode\n");
		debug("MAIL CONTAINS:\n".$mailbody."\n");
	    }
	}
    } # else do nothing, not time yet
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}