Synnefo

# Copyright 2012, 2013 GRNET S.A. All rights reserved.

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from django.utils import simplejson as json

from django.db import transaction

from snf_django.lib.api import faults

from synnefo.db.models import (QuotaHolderSerial, VirtualMachine, Network,

                               IPAddress)

from synnefo.settings import (CYCLADES_SERVICE_TOKEN as ASTAKOS_TOKEN,

                              ASTAKOS_AUTH_URL)

from astakosclient import AstakosClient

from astakosclient.errors import AstakosClientException, QuotaLimit

from functools import wraps

import logging

log = logging.getLogger(__name__)

DEFAULT_SOURCE = 'system'

RESOURCES = [

    "cyclades.vm",

    "cyclades.cpu",

    "cyclades.active_cpu",

    "cyclades.disk",

    "cyclades.ram",

    "cyclades.active_ram",

    "cyclades.network.private",

    "cyclades.floating_ip",

]

class Quotaholder(object):

    _object = None

    @classmethod

    def get(cls):

        if cls._object is None:

            cls._object = AstakosClient(

                ASTAKOS_TOKEN,

                ASTAKOS_AUTH_URL,

                use_pool=True,

                retry=3,

                logger=log)

        return cls._object

def handle_astakosclient_error(func):

    """Decorator for converting astakosclient errors to 500."""

    @wraps(func)

    def wrapper(*args, **kwargs):

        try:

            return func(*args, **kwargs)

        except AstakosClientException:

            log.exception("Unexpected error")

            raise faults.InternalServerError("Unexpected error")

    return wrapper

@handle_astakosclient_error

def issue_commission(user, source, provisions, name="",

                     force=False, auto_accept=False):

    """Issue a new commission to the quotaholder.

    Issue a new commission to the quotaholder, and create the

    corresponing QuotaHolderSerial object in DB.

    """

    qh = Quotaholder.get()

    try:

        serial = qh.issue_one_commission(

            user, source, provisions, name=name,

            force=force, auto_accept=auto_accept)

    except QuotaLimit as e:

        msg, details = render_overlimit_exception(e)

        raise faults.OverLimit(msg, details=details)

    if serial:

        serial_info = {"serial": serial}

        if auto_accept:

            serial_info["pending"] = False

            serial_info["accept"] = True

            serial_info["resolved"] = True

        return QuotaHolderSerial.objects.create(**serial_info)

    else:

        raise Exception("No serial")

def accept_serial(serial, strict=True):

    assert serial.pending or serial.accept

    response = resolve_commissions(accept=[serial.serial], strict=strict)

    serial.pending = False

    serial.accept = True

    serial.resolved = True

    serial.save()

    return response

def reject_serial(serial, strict=True):

    assert serial.pending or not serial.accept

    response = resolve_commissions(reject=[serial.serial], strict=strict)

    serial.pending = False

    serial.accept = False

    serial.resolved = True

    serial.save()

    return response

def accept_commissions(accepted, strict=True):

    return resolve_commissions(accept=accepted, strict=strict)

def reject_commissions(rejected, strict=True):

    return resolve_commissions(reject=rejected, strict=strict)

@handle_astakosclient_error

def resolve_commissions(accept=None, reject=None, strict=True):

    if accept is None:

        accept = []

    if reject is None:

        reject = []

    qh = Quotaholder.get()

    response = qh.resolve_commissions(accept, reject)

    if strict:

        failed = response["failed"]

        if failed:

            log.error("Unexpected error while resolving commissions: %s",

                      failed)

    return response

def fix_pending_commissions():

    (accepted, rejected) = resolve_pending_commissions()

    resolve_commissions(accept=accepted, reject=rejected)

def resolve_pending_commissions():

    """Resolve quotaholder pending commissions.

    Get pending commissions from the quotaholder and resolve them

    to accepted and rejected, according to the state of the

    QuotaHolderSerial DB table. A pending commission in the quotaholder

    can exist in the QuotaHolderSerial table and be either accepted or

    rejected, or cannot exist in this table, so it is rejected.

    """

    qh_pending = get_quotaholder_pending()

    if not qh_pending:

        return ([], [])

    qh_pending.sort()

    min_ = qh_pending[0]

    serials = QuotaHolderSerial.objects.filter(serial__gte=min_, pending=False)

    accepted = serials.filter(accept=True).values_list('serial', flat=True)

    accepted = filter(lambda x: x in qh_pending, accepted)

    rejected = list(set(qh_pending) - set(accepted))

    return (accepted, rejected)

def get_quotaholder_pending():

    qh = Quotaholder.get()

    pending_serials = qh.get_pending_commissions()

    return pending_serials

def render_overlimit_exception(e):

    resource_name = {"vm": "Virtual Machine",

                     "cpu": "CPU",

                     "ram": "RAM",

                     "network.private": "Private Network",

                     "floating_ip": "Floating IP address"}

    details = json.loads(e.details)

    data = details['overLimit']['data']

    usage = data["usage"]

    limit = data["limit"]

    available = limit - usage

    provision = data['provision']

    requested = provision['quantity']

    resource = provision['resource']

    res = resource.replace("cyclades.", "", 1)

    try:

        resource = resource_name[res]

    except KeyError:

        resource = res

    msg = "Resource Limit Exceeded for your account."

    details = "Limit for resource '%s' exceeded for your account."\

              " Available: %s, Requested: %s"\

              % (resource, available, requested)

    return msg, details

@transaction.commit_manually

def issue_and_accept_commission(resource, delete=False):

    """Issue and accept a commission to Quotaholder.

    This function implements the Commission workflow, and must be called

    exactly after and in the same transaction that created/updated the

    resource. The workflow that implements is the following:

    0) Resolve previous unresolved commission if exists

    1) Issue commission and get a serial

    2) Store the serial in DB and mark is as one to accept

    3) Correlate the serial with the resource

    4) COMMIT!

    5) Accept commission to QH (reject if failed until 5)

    6) Mark serial as resolved

    7) COMMIT!

    """

    resolve_commission(resource.serial)

    try:

        # Convert resources in the format expected by Quotaholder

        qh_resources = prepare_qh_resources(resource)

        if delete:

            qh_resources = reverse_quantities(qh_resources)

        # Issue commission and get the assigned serial

        commission_reason = ("client: api, resource: %s, delete: %s"

                             % (resource, delete))

        serial = issue_commission(user=resource.userid, source=DEFAULT_SOURCE,

                                  provisions=qh_resources,

                                  name=commission_reason)

    except:

        transaction.rollback()

        raise

    try:

        # Mark the serial as one to accept and associate it with the resource

        serial.pending = False

        serial.accept = True

        serial.save()

        resource.serial = serial

        resource.save()

        transaction.commit()

        # Accept the commission to quotaholder

        accept_serial(serial)

        transaction.commit()

        return serial

    except:

        log.exception("Unexpected ERROR")

        transaction.rollback()

        reject_serial(serial)

        transaction.commit()

        raise

def prepare_qh_resources(resource):

    if isinstance(resource, VirtualMachine):

        flavor = resource.flavor

        return {'cyclades.vm': 1,

                'cyclades.cpu': flavor.cpu,

                'cyclades.active_cpu': flavor.cpu,

                'cyclades.disk': 1073741824 * flavor.disk,  # flavor.disk in GB

                # 'public_ip': 1,

                #'disk_template': flavor.disk_template,

                # flavor.ram is in MB

                'cyclades.ram': 1048576 * flavor.ram,

                'cyclades.active_ram': 1048576 * flavor.ram}

    elif isinstance(resource, Network):

        return {"cyclades.network.private": 1}

    elif isinstance(resource, IPAddress):

        if resource.floating_ip:

            return {"cyclades.floating_ip": 1}

    else:

        raise ValueError("Unknown Resource '%s'" % resource)

def get_commission_info(resource, action, action_fields=None):

    if isinstance(resource, VirtualMachine):

        flavor = resource.flavor

        resources = {"cyclades.vm": 1,

                     "cyclades.cpu": flavor.cpu,

                     "cyclades.disk": 1073741824 * flavor.disk,

                     "cyclades.ram": 1048576 * flavor.ram}

        online_resources = {"cyclades.active_cpu": flavor.cpu,

                            "cyclades.active_ram": 1048576 * flavor.ram}

        if action == "BUILD":

            resources.update(online_resources)

            return resources

        if action == "START":

            if resource.operstate == "STOPPED":

                return online_resources

            else:

                return None

        elif action == "STOP":

            if resource.operstate in ["STARTED", "BUILD", "ERROR"]:

                return reverse_quantities(online_resources)

            else:

                return None

        elif action == "REBOOT":

            if resource.operstate == "STOPPED":

                return online_resources

            else:

                return None

        elif action == "DESTROY":

            if resource.operstate in ["STARTED", "BUILD", "ERROR"]:

                resources.update(online_resources)

            return reverse_quantities(resources)

        elif action == "RESIZE" and action_fields:

            beparams = action_fields.get("beparams")

            cpu = beparams.get("vcpus", flavor.cpu)

            ram = beparams.get("maxmem", flavor.ram)

            return {"cyclades.cpu": cpu - flavor.cpu,

                    "cyclades.ram": 1048576 * (ram - flavor.ram)}

        else:

            #["CONNECT", "DISCONNECT", "SET_FIREWALL_PROFILE"]:

            return None

def reverse_quantities(resources):

    return dict((r, -s) for r, s in resources.items())

def handle_resource_commission(resource, action, commission_name,

                               commission_info=None, force=False,

                               auto_accept=False, action_fields=None):

    """Handle a issuing of a commission for a resource.

    Create a new commission for a resource based on the action that

    is performed. If the resource has a previous pending commission,

    resolved it before issuing the new one.

    """

    # Try to resolve previous serial

    resolve_commission(resource.serial, force=force)

    # Check if action is quotable and issue the corresponding commission

    serial = None

    if commission_info is None:

        commission_info = get_commission_info(

            resource, action=action, action_fields=action_fields)

    if commission_info is not None:

        # Issue new commission, associate it with the resource

        if commission_name is None:

            commission_name = "client: api, resource %s" % resource

        serial = issue_commission(user=resource.userid,

                                  source=DEFAULT_SOURCE,

                                  provisions=commission_info,

                                  name=commission_name,

                                  force=force,

                                  auto_accept=auto_accept)

    resource.serial = serial

class ResolveError(Exception):

    pass

def resolve_commission(serial, force=False):

    if serial is None or serial.resolved:

        return

    if serial.pending and not force:

        m = "Could not resolve commission: serial %s is undecided" % serial

        raise ResolveError(m)

    log.warning("Resolving pending commission: %s", serial)

    if not serial.pending and serial.accept:

        accept_serial(serial)

    else:

        reject_serial(serial)