GeniCM.pm.in 36.5 KB
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#!/usr/bin/perl -wT
#
# EMULAB-COPYRIGHT
# Copyright (c) 2008 University of Utah and the Flux Group.
# All rights reserved.
#
package GeniCM;

#
# The server side of the CM interface on remote sites. Also communicates
# with the GMC interface at Geni Central as a client.
#
use strict;
use Exporter;
use vars qw(@ISA @EXPORT);

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

# Must come after package declaration!
use lib '@prefix@/lib';
use GeniDB;
use Genixmlrpc;
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use GeniResponse;
use GeniTicket;
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use GeniCredential;
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use GeniCertificate;
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use GeniSlice;
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use GeniAggregate;
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use GeniAuthority;
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use GeniSliver;
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use GeniUser;
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use libtestbed;
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# Hate to import all this crap; need a utility library.
use libdb qw(TBGetUniqueIndex TBcheck_dbslot TBDB_CHECKDBSLOT_ERROR);
use User;
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use Node;
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use Interface;
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use English;
use Data::Dumper;
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use XML::Simple;
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use Experiment;
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# Configure variables
my $TB		   = "@prefix@";
my $TBOPS          = "@TBOPSEMAIL@";
my $TBAPPROVAL     = "@TBAPPROVALEMAIL@";
my $TBAUDIT   	   = "@TBAUDITEMAIL@";
my $BOSSNODE       = "@BOSSNODE@";
my $OURDOMAIN      = "@OURDOMAIN@";
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my $CREATEEXPT     = "$TB/bin/batchexp";
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my $ENDEXPT        = "$TB/bin/endexp";
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my $NALLOC	   = "$TB/bin/nalloc";
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my $NFREE	   = "$TB/bin/nfree";
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my $AVAIL	   = "$TB/sbin/avail";
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my $PTOPGEN	   = "$TB/libexec/ptopgen";
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my $TBSWAP	   = "$TB/bin/tbswap";
my $SWAPEXP	   = "$TB/bin/swapexp";
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my $PLABSLICE	   = "$TB/sbin/plabslice";
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#
# Respond to a GetTicket request. 
#
sub Resolve($)
{
    my ($argref) = @_;
    my $uuid       = $argref->{'uuid'};
    my $hrn        = $argref->{'hrn'};
    my $cred       = $argref->{'credential'};
    my $type       = $argref->{'type'};

    if (! defined($cred)) {
	return GeniResponse->MalformedArgsResponse();
    }
    if (! (defined($type) && ($type =~ /^(Node)$/))) {
	return GeniResponse->MalformedArgsResponse();
    }
    # Allow lookup by uuid or hrn.
    if (! (defined($uuid) || defined($hrn))) {
	return GeniResponse->MalformedArgsResponse();
    }
    if (defined($uuid) && !($uuid =~ /^[-\w]*$/)) {
	return GeniResponse->MalformedArgsResponse();
    }
    if (defined($hrn) && !($hrn =~ /^[-\w\.]*$/)) {
	return GeniResponse->MalformedArgsResponse();
    }

    my $credential = GeniCredential->CreateFromSigned($cred);
    if (!defined($credential)) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not create GeniCredential object");
    }
    
    #
    # Make sure the credential was issued to the caller, but no special
    # permission required to resolve component resources.
    #
    if ($credential->owner_uuid() ne $ENV{'GENIUUID'}) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "This is not your credential!");
    }
    if ($type eq "Node") {
	my $node;
	
	if (defined($uuid)) {
	    $node= Node->Lookup($uuid);
	}
	else {
	    #
	    # We only want the last token for node lookup.
	    #
	    if ($hrn =~ /\./) {
		($hrn) = ($hrn =~ /\.(\w*)$/);
	    }
	    $node= Node->Lookup($hrn);
	}
	if (!defined($node)) {
	    return GeniResponse->Create(GENIRESPONSE_SEARCHFAILED,
					undef, "Nothing here by that name");
	}
	
	# Return a blob.
	my $blob = { "hrn"          => "${OURDOMAIN}." . $node->node_id(),
		     "uuid"         => $node->uuid(),
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		     "role"	    => $node->role(),
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		   };

	#
	# Get the list of interfaces for the node.
	#
	my @interfaces;
	if ($node->AllInterfaces(\@interfaces) != 0) {
	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					"Could not get interfaces for $uuid");
	}

	my @iblobs = ();
	foreach my $interface (@interfaces) {
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	    next
		if (!defined($interface->switch_id()));
		
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	    my $iblob = { "uuid"	=> $interface->uuid(),
			  "iface"	=> $interface->iface(),
			  "type"	=> $interface->type(),
			  "card"	=> $interface->card(),
			  "port"	=> $interface->port(),
			  "role"	=> $interface->role(),
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			  "IP"		=> $interface->IP() || "",
			  "mask"	=> $interface->mask() || "",
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			  "MAC"		=> $interface->mac(),
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			  "switch_id"   => "${OURDOMAIN}." . 
			      $interface->switch_id(),
			  "switch_card"	=> $interface->switch_card(),
			  "switch_port"	=> $interface->switch_port(),
			  "wire_type"	=> $interface->wire_type(),
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		      };

	    push(@iblobs, $iblob);
	}
	$blob->{'interfaces'} = \@iblobs
	    if (@iblobs);
	
	return GeniResponse->Create(GENIRESPONSE_SUCCESS, $blob);
    }
    return GeniResponse->Create(GENIRESPONSE_UNSUPPORTED);
}

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#
# Discover resources on this component, returning a resource availablity spec
#
sub DiscoverResources($)
{
    my ($argref) = @_;
    my $credential = $argref->{'credential'};
    my $user_uuid  = $ENV{'GENIUSER'};

    $credential = GeniCredential->CreateFromSigned($credential);
    if (!defined($credential)) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not create GeniCredential object");
    }
    # The credential owner/slice has to match what was provided.
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    if ($user_uuid ne $credential->owner_uuid()) {
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	return GeniResponse->Create(GENIRESPONSE_FORBIDDEN, undef,
				    "Invalid credentials for operation");
    }

    #
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    # Use ptopgen in xml mode to spit back an xml file. 
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    #
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    if (! open(AVAIL, "$PTOPGEN -x -g -r -p GeniSlices |")) {
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	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not start avail");
    }
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    my $xml = "";
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    while (<AVAIL>) {
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	$xml .= $_;
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    }
    close(AVAIL);

    return GeniResponse->Create(GENIRESPONSE_SUCCESS, $xml);
}
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#
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# Respond to a GetTicket request. 
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#
sub GetTicket($)
{
    my ($argref) = @_;
    my $rspec      = $argref->{'rspec'};
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    my $impotent   = $argref->{'impotent'};
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    my $cred       = $argref->{'credential'};
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    my $vtopo      = $argref->{'virtual_topology'};
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    my $owner_uuid = $ENV{'GENIUSER'};
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    if (! defined($cred)) {
	return GeniResponse->MalformedArgsResponse();
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    }
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    if (! (defined($rspec) && ($rspec =~ /^[-\w]+$/))) {
	GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
			     "Improper rspec");	
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    }
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    $rspec = XMLin($rspec, ForceArray => ["node", "link", "linkendpoints"]);
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    $impotent = 0
	if (!defined($impotent));

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    my $credential = GeniCredential->CreateFromSigned($cred);
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    if (!defined($credential)) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not create GeniCredential object");
    }
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    my $slice_uuid = $credential->target_uuid();
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    my $user_uuid  = $credential->owner_uuid();
    
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    #
    # Make sure the credential was issued to the caller.
    #
    if ($credential->owner_uuid() ne $ENV{'GENIUUID'}) {
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	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
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				    "This is not your credential!");
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    }
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    #
    # See if we have a record of this slice in the DB. If not, then we have
    # to go to the ClearingHouse to find its record, so that we can find out
    # who the SA for it is.
    #
    my $slice = GeniSlice->Lookup($slice_uuid);
    if (!defined($slice)) {
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	$slice = CreateSliceFromCertificate($credential);
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	if (!defined($slice)) {
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	    print STDERR "Could not create $slice_uuid\n";
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	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
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					"Could not create slice");
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	}
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    }

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    #
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    # Ditto the user.
    #
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    my $user = GeniUser->Lookup($user_uuid);
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    if (!defined($user)) {
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	$user = CreateUserFromCertificate($credential->owner_cert());
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	if (!defined($user)) {
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	    print STDERR "No user $user_uuid in the ClearingHouse\n";
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	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
			    "Could not get user info from ClearingHouse");
	}
    }

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    my $experiment = GeniExperiment($slice_uuid);
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    if (!defined($experiment)) {
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	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Internal Error");
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    }

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    #
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    # An rspec is a structure that requests specific nodes. If those
    # nodes are available, then reserve it. Otherwise the ticket
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    # cannot be granted.
    #
    # XXX Simpleminded ... assumes only physical nodes for now. Need to deal
    # with virtual nodes (vservers on shared nodes, planetlab nodes, etc).
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    #
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    my @nodeids = ();
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    my $pid     = $experiment->pid();
    my $eid     = $experiment->eid();

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    foreach my $ref (@{$rspec->{'node'}}) {
	my $resource_uuid = $ref->{'uuid'};
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	my $node = Node->Lookup($resource_uuid);
	if (!defined($node)) {
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	    return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
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					"Bad resource_uuid $resource_uuid");
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	}
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	#
	# Widearea nodes do not need to be allocated, but for now all
	# I allow is a plabdslice node.
	#
	if ($node->isremotenode()) {
	    if (! $node->isplabphysnode()) {
		return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
					    "Only plab widearea nodes");
	    }
	    next;
	}
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	#
	# See if the node is already reserved.
	#
	my $reservation = $node->Reservation();
	if (defined($reservation)) {
	    return GeniResponse->Create(GENIRESPONSE_UNAVAILABLE, undef,
				"$resource_uuid ($node) is not available");
	}
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	push(@nodeids, $node->node_id());
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    }
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    #
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    # Create the ticket first, before allocating the node.
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    #
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    my $ticket = GeniTicket->Create($slice, $user, $rspec);
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    if (!defined($ticket)) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not create GeniTicket object");
    }
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    # Nalloc might fail if the node gets picked up by someone else.
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    if (@nodeids && !$impotent) {
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	system("$NALLOC $pid $eid @nodeids");
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	if (($? >> 8) < 0) {
	    $ticket->Delete();
	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					"Allocation failure");
	}
	elsif (($? >> 8) > 0) {
	    $ticket->Delete();
	    return GeniResponse->Create(GENIRESPONSE_UNAVAILABLE, undef,
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					"Could not allocate node");
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	}
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    }
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    if (defined($vtopo) && $experiment->InsertVirtTopo($vtopo) != 0) {
	# Release will free the nodes.
	$ticket->Release();
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not insert virt topology");
    }
    
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    if ($ticket->Sign() != 0) {
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	# Release will free the nodes.
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	$ticket->Release();
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	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not sign Ticket");
    }
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    return GeniResponse->Create(GENIRESPONSE_SUCCESS,
				$ticket->asString());
}

#
# Create a sliver.
#
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sub RedeemTicket($)
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{
    my ($argref) = @_;
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    my $ticket     = $argref->{'ticket'};
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    my $impotent   = $argref->{'impotent'};
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    my $extraargs  = $argref->{'extraargs'};
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    $impotent = 0
	if (!defined($impotent));
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    if (! (defined($ticket) &&
	   !TBcheck_dbslot($ticket, "default", "text",
			   TBDB_CHECKDBSLOT_ERROR))) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "ticket: ". TBFieldErrorString());
    }
    $ticket = GeniTicket->CreateFromSignedTicket($ticket);
    if (!defined($ticket)) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not create GeniTicket object");
    }
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    #
    # Make sure the credential was issued to the caller.
    #
    if ($ticket->owner_uuid() ne $ENV{'GENIUUID'}) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "This is not your credential!");
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    }
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    return ModifySliver(undef, $ticket, $ticket->rspec(), $impotent);
}
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#
# Update a sliver with a different resource set.
#
sub UpdateSliver($)
{
    my ($argref) = @_;
    my $cred        = $argref->{'credential'};
    my $rspec       = $argref->{'rspec'};
    my $impotent    = $argref->{'impotent'};

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

    if (!defined($cred)) {
	return GeniResponse->Create(GENIRESPONSE_BADARGS);
    }
    if (! (defined($rspec) && ($rspec =~ /^[-\w]+$/))) {
	GeniResponse->Create(GENIRESPONSE_BADARGS, undef, "Improper rspec");
    }
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    $rspec = XMLin($rspec, ForceArray => ["node", "link", "linkendpoints"]);
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    my $credential = GeniCredential->CreateFromSigned($cred);
    if (!defined($credential)) {
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	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
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				    "Could not create GeniCredential object");
    }
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    my $sliver_uuid = $credential->target_uuid();
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    my $user_uuid   = $credential->owner_uuid();
    
    #
    # Make sure the credential was issued to the caller.
    #
    if ($credential->owner_uuid() ne $ENV{'GENIUUID'}) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "This is not your credential!");
    }
    my $sliver = GeniSliver->Lookup($sliver_uuid);
    if (defined($sliver)) {
	return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
				    "Only aggregates for now");
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    }
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    my $aggregate = GeniAggregate->Lookup($sliver_uuid);
    if (!defined($aggregate)) {
	return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
				    "No such aggregate $sliver_uuid");
    }
    return ModifySliver($aggregate, $credential, $rspec, $impotent);
}
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#
# Utility function for above routines.
#
sub ModifySliver($$$$)
{
    my ($object, $credential, $rspec, $impotent) = @_;

    my $owner_uuid = $credential->owner_uuid();
    my $message    = "Error creating sliver/aggregate";
    my $slice_uuid;
    my $aggregate;
    
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    #
    # See if we have a record of this slice in the DB. If not, throw an
    # error; might change later.
    #
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    if (defined($object)) {
	# We get the slice via the sliver/aggregate.
	$slice_uuid = $object->slice_uuid();
    }
    else {
	$slice_uuid = $credential->slice_uuid();
    }
    my $slice = GeniSlice->Lookup($slice_uuid);
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    if (!defined($slice)) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "No slice record for slice");
    }

    #
    # Ditto the user.
    #
    my $owner = GeniUser->Lookup($owner_uuid);
    if (!defined($owner)) {
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	$owner = CreateUserFromCertificate($credential->owner_cert());
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	if (!defined($owner)) {
	    print STDERR "No user $owner_uuid in the ClearingHouse\n";
	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					"No user record for $owner_uuid");
	}
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    }

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    my $experiment = GeniExperiment($slice_uuid);
    if (!defined($experiment)) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "No local experiment for slice");
    }
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    print STDERR Dumper($rspec);
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    #
    # Figure out what nodes to allocate or free. 
    #
    my %nodelist = ();
    my %linklist = ();
    my %toalloc  = ();
    my @tofree   = ();
    my $pid      = $experiment->pid();
    my $eid      = $experiment->eid();
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    my $needplabslice = 0;
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    #
    # Find current nodes and record their uuids. 
    #
    if (defined($object)) {
	if ($object->type() eq "Link") {
	    return GeniResponse->Create(GENIRESPONSE_UNSUPPORTED, undef,
					"Only node aggregates allowed");
	}
	my @slivers;
	if ($object->SliverList(\@slivers) != 0) {
	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef);
	}
	foreach my $s (@slivers) {
	    if (ref($s) eq "GeniSliver::Node") {
		$nodelist{$s->resource_uuid()} = $s;
	    }
	    elsif (ref($s) eq "GeniAggregate::Link") {
		$linklist{$s->uuid()} = $s;
	    }
	    else {
		return GeniResponse->Create(GENIRESPONSE_UNSUPPORTED, undef,
					    "Only nodes or links allowed");
	    }
	}
    }

    #
    # Figure out what nodes need to be allocated.
    #
    foreach my $ref (@{$rspec->{'node'}}) {
	my $resource_uuid = $ref->{'uuid'};
	my $node = Node->Lookup($resource_uuid);
	if (!defined($node)) {
	    return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
					"Bad resource_uuid $resource_uuid");
	}

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	#
	# Widearea nodes do not need to be allocated, but for now all
	# I allow is a plabdslice node.
	#
	if ($node->isremotenode()) {
	    if (! $node->isplabphysnode()) {
		return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
					    "Only plab widearea nodes");
	    }
	    $needplabslice = 1;
	    next;
	}

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	#
	# See if the node is already reserved. 
	#
	my $reservation = $node->Reservation();
	if (defined($reservation)) {
	    # Reserved during previous operation on the sliver.
	    next
		if ($reservation->SameExperiment($experiment));
	    
	    return GeniResponse->Create(GENIRESPONSE_UNAVAILABLE, undef,
				"$resource_uuid ($node) is not available");
	}
	#
	# Sanity check on the list of already allocated nodes.
	#
	foreach my $s (values(%nodelist)) {
	    if ($resource_uuid eq $s->resource_uuid()) {
		print STDERR
		    "$resource_uuid is not supposed to be allocated\n";
		return GeniResponse->Create(GENIRESPONSE_ERROR, undef);
	    }
	}
	$toalloc{$resource_uuid} = $node->node_id();
    }

    #
    # What nodes need to be released?
    #
    foreach my $s (values(%nodelist)) {
	my $node_uuid = $s->resource_uuid();
	my $node      = Node->Lookup($node_uuid);
	my $needfree  = 1;
	
	foreach my $ref (@{$rspec->{'node'}}) {
	    my $resource_uuid = $ref->{'uuid'};
	    if ($node_uuid eq $resource_uuid) {
		$needfree = 0;
		last;
	    }
	}
	if ($needfree) {
	    #
	    # Not yet.
	    #
	    my @dlist;
	    if ($s->DependentSlivers(\@dlist) != 0) {
		return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					    "Could not get DependentSlivers");
	    }
	    if (@dlist) {
		return GeniResponse->Create(GENIRESPONSE_REFUSED, undef,
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				    "Must tear down dependent slivers first");
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	    }
	    push(@tofree, $s);
	}
    }

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    #
    # Create an emulab nonlocal user for tmcd.
    #
    $owner->BindToSlice($slice) == 0
	or return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				       "Error binding user to slice");
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    # Bind the other users too.
    my @userbindings;
    if ($slice->UserBindings(\@userbindings) != 0) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Error binding users to slice");
    }
    foreach my $otheruuid (@userbindings) {
	my $otheruser = GeniUser->Lookup($otheruuid);
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	if (!defined($otheruser)) {
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	    $otheruser = CreateUserFromCertificate($otheruuid);
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	    if (!defined($otheruser)) {
		print STDERR "No user $otheruser, cannot bind to slice\n";
		next;
	    }
	}
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	if ($otheruser->BindToSlice($slice) != 0) {
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	    print STDERR "Could not bind $otheruser to $slice\n";
	}
    }

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    #
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    # We are actually an Aggregate, so return an aggregate of slivers,
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    # even if there is just one node. This makes sliceupdate easier.
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    #
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    if (defined($object)) {
	$aggregate = $object;
    }
    else {
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	#
	# Form the hrn from the slicename.
	#
	my $hrn = "${OURDOMAIN}." . $slice->slicename();
	
	$aggregate = GeniAggregate->Create($slice, $owner, "Aggregate",
					   $hrn, $slice->hrn());
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	if (!defined($aggregate)) {
	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
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				"Could not create GeniAggregate object");
	}
    }

    # Nalloc might fail if the node gets picked up by someone else.
    if (values(%toalloc) && !$impotent) {
	my @list = values(%toalloc);
	system("$NALLOC $pid $eid @list");
	if ($?) {
	    # Nothing to deallocate if this fails.
	    %toalloc = undef;
	    $message = "Allocation failure";
	    goto bad;
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	}
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    }
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    #
    # We need to tear down links that are no longer in the rspec or
    # have changed.
    #
    foreach my $s (values(%linklist)) {
	my $needfree  = 1;

	if (! exists($rspec->{'link'}->{$s->hrn()})) {
	    $s->UnProvision();
	    $s->Delete();
	    next;
	}
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	my $delete     = 0;
	my @interfaces = ();
	if ($s->SliverList(\@interfaces) != 0) {
	    $message = "Failed to get sliverlist for $s";
	    goto bad;
	}
	foreach my $i (@interfaces) {
	    my $node_uuid   = $i->resource_uuid();
	    my $iface_name  = $i->rspec()->{'iface_name'};

	    my $linkendpoints =
		$rspec->{'link'}->{$s->hrn()}->{'LinkEndPoints'};
	}
    }
    
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    #
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    # Now for each resource (okay, node) in the ticket create a sliver and
    # add it to the aggregate.
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    #
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    my %slivers = ();
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    foreach my $ref (@{$rspec->{'node'}}) {
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	my $resource_uuid = $ref->{'uuid'};
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	# Already in the aggregate?
	next
	    if (grep {$_ eq $resource_uuid} keys(%nodelist));
	
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	my $node = Node->Lookup($resource_uuid);
	if (!defined($node)) {
	    $message = "Unknown resource_uuid in ticket: $resource_uuid";
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	    goto bad;
	}
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	my $sliver = GeniSliver::Node->Create($slice,
					      $owner->uuid(),
					      $resource_uuid,
					      $ref);
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	if (!defined($sliver)) {
	    $message = "Could not create GeniSliver object for $resource_uuid";
	    goto bad;
	}
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	$slivers{$resource_uuid} = $sliver;
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	#
	# Remove this from %toalloc; if there is an error, the slivers are
	# deleted and the node released there. We only delete nodes that
	# have not turned into slivers yet. Ick.
	#
	delete($toalloc{$resource_uuid});
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    }
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    #
    # Now do the links. For each link, we have to add a sliver for the
    # interfaces, and then combine those two interfaces into an aggregate,
    # and then that aggregate goes into the aggregate for toplevel sliver.
    #
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    foreach my $linkname (keys(%{$rspec->{'link'}})) {
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	my @linkslivers  = ();
	if (! ($linkname =~ /^[-\w]*$/)) {
	    $message = "Bad name for link: $linkname";
	    goto bad;
	}

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	my $linkaggregate = GeniAggregate::Link->Create($slice, $owner,
							$linkname);
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	if (!defined($linkaggregate)) {
	    $message = "Could not create link aggregate for $linkname";
	    goto bad;
	}
	$slivers{$linkaggregate->uuid()} = $linkaggregate;

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	foreach my $ref (@{$rspec->{'link'}->{$linkname}->{'LinkEndPoints'}}) {
	    my $node_uuid  = $ref->{'node_uuid'};
	    my $iface_name = $ref->{'iface_name'};
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	    my $nodesliver = $slivers{$node_uuid} || $nodelist{$node_uuid};
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	    if (!defined($nodesliver)) {
		$message = "Link $linkname specifies a non-existent node";
		goto bad;
	    }
	    my $nodeobject= Node->Lookup($node_uuid);
	    if (!defined($nodeobject)) {
		$message = "Could not find node object for $node_uuid";
		goto bad;
	    }
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	    my $interface = Interface->LookupByIface($nodeobject, $iface_name);
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	    if (!defined($interface)) {
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		$message = "No such interface $iface_name on node $nodeobject";
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		goto bad;
	    }
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	    my $sliver = GeniSliver::Interface->Create($slice,
						       $owner->uuid(),
						       $interface->uuid(),
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						       $nodeobject,
						       $ref);
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	    if (!defined($sliver)) {
		$message = "Could not create GeniSliver ".
		    "$interface in $linkname";
		goto bad;
	    }
	    if ($sliver->SetAggregate($linkaggregate) != 0) {
		$message = "Could not add link sliver $sliver to $aggregate";
		goto bad;
	    }
	}
    }

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    #
    # Create a planetlab slice before provisioning (which creates nodes).
    #
    if ($needplabslice && !$impotent) {
	system("$PLABSLICE create $pid $eid");
	if ($?) {
	    $message = "Plab Slice creation failure";
	    goto bad;
	}
    }

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    #
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    # Now do the provisioning (note that we actually allocated the
    # node above when the ticket was granted). Then add the sliver to
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    # the aggregate. 
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    #
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    foreach my $sliver (values(%slivers)) {
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	if (!$impotent && $sliver->Provision() != 0) {
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	    $message = "Could not provision $sliver";
	    goto bad;
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	}
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	if ($sliver->SetAggregate($aggregate) != 0) {
	    $message = "Could not set aggregate for $sliver to $aggregate";
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	    goto bad;
	}
    }

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    #
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    # The API states we return a credential to control the aggregate.
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    #
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    if (ref($credential) eq "GeniTicket") {
	my $ticket  = $credential;
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	$credential = $aggregate->NewCredential($owner);
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	if (!defined($credential)) {
	    $message = "Could not create credential";
	    goto bad;
	}
    
	#
	# The last step is to delete the ticket, since it is no longer needed.
	# and will cause less confusion if it is not in the DB.
	#
	if ($ticket->Delete() != 0) {
	    print STDERR "Error deleting $ticket for $slice\n";
	}
	return GeniResponse->Create(GENIRESPONSE_SUCCESS,
				    $credential->asString());
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    }
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    #
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    # Free any slivers that were no longer wanted.
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    #
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    if (@tofree) {

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    }
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    return GeniResponse->Create(GENIRESPONSE_SUCCESS);
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  bad:
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    foreach my $sliver (values(%slivers)) {
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	$sliver->UnProvision()
	    if (! $impotent);
	$sliver->Delete();
    }
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    if (values(%toalloc)) {
	my @list = values(%toalloc);

	system("export NORELOAD=1; $NFREE -x -q $pid $eid @list");
    }
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    $aggregate->Delete()
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	if (defined($aggregate) && !defined($object));
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    return GeniResponse->Create(GENIRESPONSE_ERROR, undef, $message);
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}

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#
# Release a ticket.
#
sub ReleaseTicket($)
{
    my ($argref) = @_;
    my $ticket     = $argref->{'ticket'};

    if (! (defined($ticket) &&
	   !TBcheck_dbslot($ticket, "default", "text",
			   TBDB_CHECKDBSLOT_ERROR))) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "ticket: ". TBFieldErrorString());
    }
    $ticket = GeniTicket->CreateFromSignedTicket($ticket);
    if (!defined($ticket)) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not create GeniTicket object");
    }
    
    #
    # Make sure the credential was issued to the caller.
    #
    if ($ticket->owner_uuid() ne $ENV{'GENIUUID'}) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "This is not your credential!");
    }
    if ($ticket->Release() != 0) {
	print STDERR "Error releasing $ticket\n";
	return GeniResponse->Create(GENIRESPONSE_ERROR);
    }
    return GeniResponse->Create(GENIRESPONSE_SUCCESS);
}

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#
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# Start a sliver (not sure what this means yet, so reboot for now).
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#
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sub StartSliver($)
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{
    my ($argref) = @_;
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    my $cred        = $argref->{'credential'};
    my $impotent    = $argref->{'impotent'};
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    $impotent = 0
	if (!defined($impotent));
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    if (!defined($cred)) {
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	return GeniResponse->Create(GENIRESPONSE_BADARGS);
    }
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    my $credential = GeniCredential->CreateFromSigned($cred);
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    if (!defined($credential)) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "Could not create GeniCredential object");
    }
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    my $sliver_uuid = $credential->target_uuid();
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    my $user_uuid   = $credential->owner_uuid();
    
    #
    # Make sure the credential was issued to the caller.
    #
    if ($credential->owner_uuid() ne $ENV{'GENIUUID'}) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "This is not your credential!");
    }
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    my $sliver = GeniSliver->Lookup($sliver_uuid);
    if (!defined($sliver)) {
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	# Might be an aggregate instead.
	$sliver = GeniAggregate->Lookup($sliver_uuid);
	if (!defined($sliver)) {
	    return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
				    "No such sliver/aggregate $sliver_uuid");
	}
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    }
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    if (!$impotent) {
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	$sliver->Start() == 0 or
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	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				"Could not start sliver/aggregate");
    }
    return GeniResponse->Create(GENIRESPONSE_SUCCESS);
}

#
# Destroy a sliver/aggregate.
#
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sub DeleteSliver($)
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{
    my ($argref) = @_;
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    my $cred        = $argref->{'credential'};
    my $impotent    = $argref->{'impotent'};
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    $impotent = 0
	if (!defined($impotent));

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    if (!defined($cred)) {
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	return GeniResponse->Create(GENIRESPONSE_BADARGS);
    }
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    my $credential = GeniCredential->CreateFromSigned($cred);
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    if (!defined($credential)) {
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	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
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				    "Could not create GeniCredential object");
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    }
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    my $sliver_uuid = $credential->target_uuid();
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    my $user_uuid   = $credential->owner_uuid();
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    my @slivers     = ();
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    #
    # Make sure the credential was issued to the caller.
    #
    if ($credential->owner_uuid() ne $ENV{'GENIUUID'}) {
	return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
				    "This is not your credential!");
    }
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    my $sliver = GeniSliver->Lookup($sliver_uuid);
    if (!defined($sliver)) {
	# Might be an aggregate instead.
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	my $aggregate = GeniAggregate->Lookup($sliver_uuid);
	if (!defined($aggregate)) {
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	    return GeniResponse->Create(GENIRESPONSE_BADARGS, undef,
				    "No such sliver/aggregate $sliver_uuid");
	}
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	push(@slivers, $aggregate);
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    }
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    else {
	# 
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	# Find dependent slivers first (say, links on a node). For now,
	# do not allow this sliver to be torn down until the dependent
	# sliver(s) are torn down first. Eventually we want to tear them
	# down here in the proper order, hence the code below.
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	#
	if ($sliver->DependentSlivers(\@slivers) != 0) {
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	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
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					"Could not get DependentSlivers");
	}
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	if (@slivers) {
	    return GeniResponse->Create(GENIRESPONSE_REFUSED, undef,
					"Must tear dow dependent slivers");
	}
	@slivers = (@slivers, $sliver);	
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    }

    foreach $sliver (@slivers) {
	if (!$impotent) {
	    $sliver->UnProvision() == 0 or
		return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					    "Could not unprovision sliver");
	}
	$sliver->Delete() == 0 or
	    return GeniResponse->Create(GENIRESPONSE_ERROR, undef,
					"Could not delete sliver");
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    }
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    return GeniResponse->Create(GENIRESPONSE_SUCCESS);
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}
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#
# Utility Routines.
#
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# Create a slice from the a certificate (GID).
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#
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sub CreateSliceFromCertificate($)
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{
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    my ($credential) = @_;
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    my $certificate = $credential->target_cert();
    my $owner_uuid  = $credential->owner_uuid();
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    my $authority = GeniAuthority->LookupByPrefix($certificate->uuid());
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    if (!defined($authority)) {
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	$authority = CreateAuthorityFromRegistry($certificate->uuid());
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	if (!defined($authority)) {
	    print STDERR "Could not create new authority record\n";
	    return undef;
	}
    }
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    #
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    # The problem with HRNs is that people will tend to reuse them.
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    # So check to see if we have a slice with the hrn, and if so
    # we need to check with the registry to see if its still active.
    # Destroy it locally if not active.
    #
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    my $slice = GeniSlice->Lookup($certificate->hrn());
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    if (defined($slice)) {
	return $slice
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	    if ($slice->uuid() eq $certificate->uuid());
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	return undef
	    if (CleanupDeadSlice($slice) != 0);
    }
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    $slice = GeniSlice->Create($certificate, $owner_uuid, $authority);
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    return undef
	if (!defined($slice));

    return $slice;
}

#
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# Create a user from a certificate.
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#
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sub CreateUserFromCertificate($)
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{
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    my ($certificate) = @_;
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    #
    # Check Emulab users table first.
    #
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    my $user = User->LookupByUUID($certificate->uuid());
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    if (defined($user)) {
	my $geniuser = GeniUser->CreateFromLocal($user);
	if (!defined($geniuser)) {
	    print STDERR "Could not create geniuser from $user\n";
	    return undef;
	}
	return $geniuser;
    }

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    my $authority = GeniAuthority->LookupByPrefix($certificate->uuid());
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    if (!defined($authority)) {
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	$authority = CreateAuthorityFromRegistry($certificate->uuid());
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	if (!defined($authority)) {
	    print STDERR "Could not create new authority record\n";
	    return undef;
	}
    }
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    return GeniUser->Create($certificate, $authority);
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}

#
# Create authority from the ClearingHouse, by looking up the info.
#
sub CreateAuthorityFromRegistry($)
{
    my ($uuid) = @_;

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    my ($prefix) = ($uuid =~ /^\w+\-\w+\-\w+\-\w+\-(\w+)$/);
    
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    my $blob;
    return undef
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	if (GeniCHClient::Resolve("P${prefix}", "SA", \$blob) != 0);

    my $certificate = GeniCertificate->LoadFromString($blob->{'gid'});
    return undef
	if (!defined($certificate));
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    my $authority = GeniAuthority->Create($certificate,
					  $blob->{'url'},
					  $blob->{'type'});
    $certificate->Delete()
	if (!defined($authority));

    return $authority;
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}
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#
# Cleanup a dead slice, releasing all the stuff associated with it.
#
sub CleanupDeadSlice($)
{
    my ($slice) = @_;

    print STDERR "Cleaning up dead slice $slice\n";

    #
    # Find any aggregates and tear them down.
    #
    my @aggregates;
    if (GeniAggregate->SliceAggregates($slice, \@aggregates) != 0) {
	print STDERR "Could not get dead aggregates for $slice.\n";
	return -1;
    }
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    #
    # Link aggregates first.
    #
    my @nonlinks = ();
    
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    foreach my $aggregate (@aggregates) {
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	if ($aggregate->type() ne "Link") {
	    push(@nonlinks, $aggregate);
	    next;
	}
	if ($aggregate->UnProvision() != 0) {
	    print STDERR "Could not UnProvision $aggregate\n";
	    return -1;
	}
	if ($aggregate->Delete() != 0) {
	    print STDERR "Could not delete $aggregate\n";
	    return -1;
	}
    }
    foreach my $aggregate (@nonlinks) {
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	if ($aggregate->UnProvision() != 0) {
	    print STDERR "Could not UnProvision $aggregate\n";
	    return -1;
	}
	if ($aggregate->Delete() != 0) {
	    print STDERR "Could not delete $aggregate\n";
	    return -1;
	}
    }

    #
    # Are there any slivers left after killing the aggregates? 
    #
    my @slivers;
    if (GeniSliver->SliceSlivers($slice, \@slivers) != 0) {
	print STDERR "Could not get dead slivers for $slice.\n";
	return -1;
    }
    foreach my $sliver (@slivers) {
	if ($sliver->UnProvision() != 0) {
	    print STDERR "Could not UnProvision $sliver\n";
	    return -1;
	}
	if ($sliver->Delete() != 0) {
	    print STDERR "Could not delete $sliver\n";
	    return -1;
	}
    }

    #
    # And lastly, any tickets that were not instantiated. 
    #
    my @tickets;
    if (GeniTicket->SliceTickets($slice, \@tickets) != 0) {
	print STDERR "Could not get dead tickets for $slice.\n";
	return -1;
    }
    foreach my $ticket (@tickets) {
	print STDERR "Releasing $ticket\n";
	
	if ($ticket->Release() != 0) {
	    print STDERR "Could not delete $ticket\n";
	    return -1;
	}
    }
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    my $experiment = $slice->GetExperiment();
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    if (defined($experiment)) {
	my $pid = $experiment->pid();
	my $eid = $experiment->eid();
	system("$PLABSLICE destroy $pid $eid");
    
	system("$ENDEXPT -q $pid,$eid");
	return -1
	    if ($?);
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    }
    
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    if ($slice->Delete() != 0) {
	print STDERR "Could not delete $slice\n";
	return -1;
    }
    return 0;
}
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#
# Remove a record, specifically a slice on this component.
#
sub DeleteSlice($)