root / logic / reconciliation.py @ 9e98ba3c
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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# Copyright 2011 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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#
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"""Business logic for reconciliation
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Reconcile the contents of the DB with the actual state of the
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Ganeti backend.
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Let D be the set of VMs in the DB, G the set of VMs in Ganeti.
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RULES:
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R1. Stale servers in DB:
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For any v in D but not in G:
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Set deleted=True.
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R2. Orphan instances in Ganet:
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For any v in G with deleted=True in D:
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Issue OP_INSTANCE_DESTROY.
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R3. Unsynced operstate:
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For any v whose operating state differs between G and V:
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Set the operating state in D based on the state in G.
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In the code, D, G are Python dicts mapping instance ids to operating state.
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For D, the operating state is chosen from VirtualMachine.OPER_STATES.
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For G, the operating state is True if the machine is up, False otherwise.
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"""
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import logging |
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import sys |
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from django.core.management import setup_environ |
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try:
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from synnefo import settings |
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except ImportError: |
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raise Exception("Cannot import settings, make sure PYTHONPATH contains " |
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"the parent directory of the Synnefo Django project.")
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setup_environ(settings) |
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from synnefo.db.models import VirtualMachine |
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from synnefo.util.dictconfig import dictConfig |
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from synnefo.util.rapi import GanetiRapiClient |
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log = logging.getLogger() |
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def stale_servers_in_db(D, G): |
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idD = set(D.keys())
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idG = set(G.keys())
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return idD - idG
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def orphan_instances_in_ganeti(D, G): |
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idD = set(D.keys())
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idG = set(G.keys())
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return idG - idD
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def unsynced_operstate(D, G): |
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unsynced = set()
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idD = set(D.keys())
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idG = set(G.keys())
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for i in idD & idG: |
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if (G[i] and D[i] != 'STARTED' or |
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not G[i] and D[i] not in ('BUILD', 'ERROR', 'STOPPED')): |
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unsynced.add((i, D[i], G[i])) |
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return unsynced
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def get_servers_from_db(): |
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vms = VirtualMachine.objects.filter(deleted=False)
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return dict(map(lambda x: (x.id, x.operstate), vms)) |
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def get_instances_from_ganeti(): |
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rapi = GanetiRapiClient(*settings.GANETI_CLUSTER_INFO) |
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ganeti_instances = rapi.GetInstances(bulk=True)
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snf_instances = {} |
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prefix = settings.BACKEND_PREFIX_ID |
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for i in ganeti_instances: |
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if i['name'].startswith(prefix): |
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try:
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id = int(i['name'].split(prefix)[1]) |
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except Exception: |
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log.error("Ignoring instance with malformed name %s",
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i['name'])
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continue
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if id in snf_instances: |
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log.error("Ignoring instance with duplicate Synnefo id %s",
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i['name'])
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continue
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snf_instances[id] = i['oper_state'] |
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return snf_instances
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def main(): |
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print get_instances_from_ganeti()
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if __name__ == "__main__": |
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dictConfig(settings.RECONCILIATION_LOGGING) |
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sys.exit(main()) |