mirror of
https://github.com/GNS3/gns3-server
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39 lines
1.2 KiB
Python
39 lines
1.2 KiB
Python
#
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# Copyright (C) 2017 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from ..qemu_error import QemuError
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import logging
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log = logging.getLogger(__name__)
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def get_next_guest_cid(nodes):
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"""
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Calculates free guest_id from given nodes
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:param nodes:
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:raises QemuError when exceeds number
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:return: integer first free cid
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"""
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used = {n.guest_cid for n in nodes}
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pool = set(range(3, 65535))
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try:
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return (pool - used).pop()
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except KeyError:
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raise QemuError("Cannot create a new Qemu VM (limit of 65535 guest ID on one host reached)")
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