Synnefo

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from django.core.management.base import BaseCommand, CommandError

from optparse import make_option

from util import pool_table_from_type

POOL_CHOICES = ['bridge', 'mac-prefix']

class Command(BaseCommand):

    args = "<pool ID>"

    help = "Modify a pool"

    output_transaction = True

    option_list = BaseCommand.option_list + (

        make_option('--type', dest='type',

                    choices=POOL_CHOICES,

                    help="Type of pool"

                    ),

        make_option('--offset', dest='offset'),

        make_option('--size', dest='size'),

        make_option('--base', dest='base'),

        make_option('--add-reserved', dest='add-reserved',

                    help="Comma-seperated list of values to reserve"),

        make_option('--remove-reserved', dest="remove-reserved",

                    help="Comma-seperated list of values to release"),

    )

    def handle(self, *args, **options):

        type_ = options['type']

        offset = options['offset']

        base = options['base']

        add_reserved = options['add-reserved']

        remove_reserved = options['remove-reserved']

        if not type_:

            raise CommandError("Type of pool is mandatory")

        pool_table = pool_table_from_type(type_)

        try:

            pool_id = int(args[0])

            pool_row = pool_table.objects.get(id=pool_id)

        except (ValueError, pool_table.DoesNotExist):

            raise CommandError("Invalid pool ID")

        pool = pool_row.pool

        if add_reserved:

            reserved = add_reserved.split(',')

            for value in reserved:

                pool.reserve(value, external=True)

        if remove_reserved:

            released = remove_reserved.split(',')

            for value in released:

                pool.put(value, external=True)

        pool.save(db=False)

        if offset:

            pool_row.offset = offset

        if base:

            pool_row.base = base

        # Save now, to avoid conflict with resizing pool.save()

        pool_row.save()

        if size:

            try:

                size = int(size)

            except ValueError:

                raise CommandError("Invalid size")

            pool = pool_row.get_pool()

            self.resize_pool(pool, pool_row.size, size)

            pool.save()

    def resize_pool(self, pool, old_size, new_size):

        if new_size == old_size:

            return

        elif new_size > old_size:

            pool.extend(new_size - old_size)

        else:

            pool.shrink(old_size - new_size)

        pool.save()