Synnefo

# Copyright 2011 GRNET S.A. All rights reserved.

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# Callback functions used by the dispatcher to process incoming notifications

# from AMQP queues.

import traceback

import json

import logging

import sys

from synnefo.db.models import VirtualMachine

from synnefo.logic import utils, backend

_logger = logging.getLogger("synnefo.dispatcher")

def update_db(message):

    """Process the status of a VM based on a ganeti status message"""

    _logger.debug("Processing ganeti-op-status msg: %s", message.body)

    try:

        msg = _parse_json(message.body)

        if msg["type"] != "ganeti-op-status":

            _logger.error("Message is of unknown type %s.", msg["type"])

            return

        if msg["operation"] == "OP_INSTANCE_QUERY_DATA":

            return status_job_finished(message)

        vmid = utils.id_from_instance_name(msg["instance"])

        vm = VirtualMachine.objects.get(id=vmid)

        backend.process_op_status(vm, msg["jobId"], msg["operation"],

                                  msg["status"], msg["logmsg"])

        _logger.debug("Done processing ganeti-op-status msg for vm %s.",

                      msg["instance"])

        message.channel.basic_ack(message.delivery_tag)

    except KeyError:

        _logger.error("Malformed incoming JSON, missing attributes: %s",

                      message.body)

    except VirtualMachine.InvalidBackendIdError:

        _logger.debug("Ignoring msg for unknown instance %s.",

                      msg["instance"])

    except VirtualMachine.DoesNotExist:

        _logger.error("VM for instance %s with id %d not found in DB.",

                      msg["instance"], vmid)

    except Exception as e:

        _logger.error("Unexpected error:\n%s" %

            "".join(traceback.format_exception(*sys.exc_info())))

def update_net(message):

    """Process a network status update notification from Ganeti"""

    _logger.debug("Processing ganeti-net-status msg: %s", message.body)

    try:

        msg = _parse_json(message.body)

        if msg["type"] != "ganeti-net-status":

            _logger.error("Message is of unknown type %s", msg["type"])

            return

        vmid = utils.id_from_instance_name(msg["instance"])

        vm = VirtualMachine.objects.get(id=vmid)

        backend.process_net_status(vm, msg["nics"])

        _logger.debug("Done processing ganeti-net-status msg for vm %s.",

                      msg["instance"])

        message.channel.basic_ack(message.delivery_tag)

    except KeyError:

        _logger.error("Malformed incoming JSON, missing attributes: %s",

                      message.body)

    except VirtualMachine.InvalidBackendIdError:

        _logger.debug("Ignoring msg for unknown instance %s.",

                      msg["instance"])

    except VirtualMachine.DoesNotExist:

        _logger.error("VM for instance %s with id %d not found in DB.",

                      msg["instance"], vmid)

    except Exception as e:

        _logger.error("Unexpected error:\n%s" %

            "".join(traceback.format_exception(*sys.exc_info())))

def send_email(message):

    _logger.debug("Request to send email message")

    message.channel.basic_ack(message.delivery_tag)

def update_credits(message):

    _logger.debug("Request to update credits")

    message.channel.basic_ack(message.delivery_tag)

def trigger_status_update(message):

    _logger.debug("Request to trigger status update: %s", message.body)

    try:

        msg = _parse_json(message.body)

        if msg["type"] != "reconcile" :

             _logger.error("Message is of unknown type %s", msg["type"])

             return

        if msg["vmid"] == "" :

            _logger.error("Reconciliate message does not specify a VM id")

            return

        vm = VirtualMachine.objects.get(id=msg["vmid"])

        backend.request_status_update(vm)

        message.channel.basic_ack(message.delivery_tag)

    except KeyError as k:

        _logger.error("Malformed incoming JSON, missing attributes: %s", k)

    except Exception as e:

        _logger.error("Unexpected error:%s", e)

def status_job_finished (message) :

    try:

        msg = _parse_json(message.body)

        if msg["operation"] != 'OP_INSTANCE_QUERY_DATA':

            _logger.error("Message is of unknown type %s", msg["operation"])

            return

        if msg["status"] != "success" :

            _logger.warn("Ignoring non-success status update from job %d on VM %s",

                          msg['jobId'], msg['instance'])

            message.channel.basic_ack(message.delivery_tag)

            return

        status = backend.get_job_status(msg['jobId'])

        _logger.debug("Node status job result: %s" % status)

        if status['summary'][0] != u'INSTANCE_QUERY_DATA' :

             _logger.error("Status update is of unknown type %s", status['summary'])

             return

        conf_state = status['opresult'][0][msg['instance']]['config_state']

        run_state = status['opresult'][0][msg['instance']]['run_state']

        # XXX: The following assumes names like snf-12

        instid = msg['instance'].split('-')[1]

        vm = VirtualMachine.objects.get(id = instid)

        if run_state == "up":

            opcode = "OP_INSTANCE_REBOOT"

        else :

            opcode = "OP_INSTANCE_SHUTDOWN"

        backend.process_op_status(vm=vm, jobid=msg['jobId'],opcode=opcode,

                                  status="success",

                                  logmsg="Reconciliation: simulated event")

        message.channel.basic_ack(message.delivery_tag)

    except KeyError as k:

        _logger.error("Malformed incoming JSON, missing attributes: %s", k)

    except Exception as e:

        _logger.error("Unexpected error:%s"%e)

def dummy_proc(message):

    try:

        msg = _logger.debug(message.body)

        _logger.debug("Msg (exchange:%s) ", msg)

        message.channel.basic_ack(message.delivery_tag)

    except Exception as e:

        _logger.error("Could not receive message %s" % e.message)

        pass

def _parse_json(data):

    try:

        return json.loads(data)

    except Exception as e:

        _logger.error("Could not parse JSON file: %s", e)

        raise