APT_Instance.pm.in 5.83 KB
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#!/usr/bin/perl -wT
#
# Copyright (c) 2007-2014 University of Utah and the Flux Group.
# 
# {{{EMULAB-LICENSE
# 
# This file is part of the Emulab network testbed software.
# 
# This file is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or (at
# your option) any later version.
# 
# This file is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public
# License for more details.
# 
# You should have received a copy of the GNU Affero General Public License
# along with this file.  If not, see <http://www.gnu.org/licenses/>.
# 
# }}}
#
package APT_Instance;

use strict;
use Carp;
use Exporter;
use vars qw(@ISA @EXPORT $AUTOLOAD);

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

# Must come after package declaration!
use EmulabConstants;
use emdb;
use libtestbed;
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use APT_Profile;
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use English;
use Data::Dumper;
use overload ('""' => 'Stringify');

# Configure variables
my $TB		  = "@prefix@";
my $TBOPS         = "@TBOPSEMAIL@";

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

#
# Lookup by uuid.
#
sub Lookup($$;$)
{
    my ($class, $uuid) = @_;

    if ($uuid !~ /^\w+\-\w+\-\w+\-\w+\-\w+$/) {
	return undef
    }

    # Look in cache first
    return $instances{"$uuid"}
        if (exists($instances{"$uuid"}));
    
    my $query_result =
	DBQueryWarn("select * from apt_instances where uuid='$uuid'");

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

    my $self            = {};
    $self->{'INSTANCE'} = $query_result->fetchrow_hashref();

    bless($self, $class);
    
    # Add to cache. 
    $instances{"$uuid"} = $self;
    
    return $self;
}

AUTOLOAD {
    my $self  = $_[0];
    my $type  = ref($self) or croak "$self is not an object";
    my $name  = $AUTOLOAD;
    $name =~ s/.*://;   # strip fully-qualified portion

    # A DB row proxy method call.
    if (exists($self->{'INSTANCE'}->{$name})) {
	return $self->{'INSTANCE'}->{$name};
    }
    carp("No such slot '$name' field in class $type");
    return undef;
}

# Break circular reference someplace to avoid exit errors.
sub DESTROY {
    my $self = shift;

    $self->{'INSTANCE'} = undef;
}

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

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

    my $uuid = $self->uuid();
    
    my $query_result =
	DBQueryWarn("select * from apt_instances where uuid='$uuid'");

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

    $self->{'INSTANCE'} = $query_result->fetchrow_hashref();

    return 0;
}

#
# Create an Instance
#
sub Create($$)
{
    my ($class, $argref) = @_;
    my $uuid;

    if (exists($argref->{'uuid'})) {
	$uuid = $argref->{'uuid'};
	delete($argref->{'uuid'});
    }
    else {
	$uuid = NewUUID();
    }

    #
    # The uuid has to be unique, so lock the table for the check/insert.
    #
    DBQueryWarn("lock tables apt_instances write")
	or return undef;

    my $query_result =
	DBQueryWarn("select uuid from apt_instances where uuid='$uuid'");

    if ($query_result->numrows) {
	DBQueryWarn("unlock tables");
	tberror("Instance uuid $uuid already exists!");
	return undef;
    }

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

    if (! DBQueryWarn($query)) {
	DBQueryWarn("unlock tables");
	tberror("Error inserting new apt_instance record for $uuid!");
	return undef;
    }
    DBQueryWarn("unlock tables");
    return Lookup($class, $uuid);
}

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

    return "[APT_Instance: $uuid]";
}

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sub LookupBySlice($$)
{
    my ($class, $slice_uuid) = @_;

    if ($slice_uuid !~ /^\w+\-\w+\-\w+\-\w+\-\w+$/) {
	return undef
    }
    my $query_result =
	DBQueryWarn("select uuid from apt_instances ".
		    "where slice_uuid='$slice_uuid'");

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

    my ($uuid) = $query_result->fetchrow_array();
    return APT_Instance->Lookup($uuid);
}

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

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

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

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

    $query .= " where uuid='$uuid'";

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

    return Refresh($self);
}

sub Delete($)
{
    my ($self) = @_;

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

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

    DBQueryWarn("delete from apt_instances where uuid='$uuid'") or
	return -1;

    return 0;
}

sub SetStatus($$)
{
    my ($self,$status) = @_;

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

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

    DBQueryWarn("update apt_instances set status='$status' ".
		"where uuid='$uuid'") or
	return -1;

    $self->{'INSTANCE'}->{'status'} = $status;
    return 0;
    
}
sub SetManifest($$)
{
    my ($self,$manifest) = @_;

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

    my $uuid = $self->uuid();
    my $safe_manifest = DBQuoteSpecial($manifest);    

    DBQueryWarn("update apt_instances set manifest=$safe_manifest ".
		"where uuid='$uuid'") or
	return -1;

    $self->{'INSTANCE'}->{'manifest'} = $manifest;
    return 0;
    
}

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#
# Find the profile for this instance.
#
sub Profile($)
{
    my ($self) = @_;
    
    return APT_Profile->Lookup($self->profile_id(),
			       $self->profile_version());
}

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# _Always_ make sure that this 1 is at the end of the file...
1;