Synnefo

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

#

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# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

from synnefo.lib.quotaholder.api import (

    QuotaholderAPI,

    QH_PRACTICALLY_INFINITE,

    InvalidKeyError, NoEntityError,

    NoQuantityError, NoCapacityError,

    ExportLimitError, ImportLimitError,

    DuplicateError)

from synnefo.lib.commissioning import (

    Callpoint, CorruptedError, InvalidDataError, ReturnButFail)

from synnefo.lib.commissioning.utils.newname import newname

from django.db.models import Q, Count

from django.db import transaction

from .models import (Entity, Policy, Holding,

                     Commission, Provision, ProvisionLog, CallSerial,

                     now,

                     db_get_entity, db_get_holding, db_get_policy,

                     db_get_commission, db_filter_provision, db_get_callserial)

class QuotaholderDjangoDBCallpoint(Callpoint):

    api_spec = QuotaholderAPI()

    http_exc_lookup = {

        CorruptedError:   550,

        InvalidDataError: 400,

        InvalidKeyError:  401,

        NoEntityError:    404,

        NoQuantityError:  413,

        NoCapacityError:  413,

    }

    def init_connection(self, connection):

        if connection is not None:

            raise ValueError("Cannot specify connection args with %s" %

                             type(self).__name__)

    def commit(self):

        transaction.commit()

    def rollback(self):

        transaction.rollback()

    def do_make_call(self, call_name, data):

        call_fn = getattr(self, call_name, None)

        if not call_fn:

            m = "cannot find call '%s'" % (call_name,)

            raise CorruptedError(m)

        return call_fn(**data)

    def create_entity(self, context={}, create_entity=()):

        rejected = []

        append = rejected.append

        for idx, (entity, owner, key, ownerkey) in enumerate(create_entity):

            try:

                owner = Entity.objects.get(entity=owner, key=ownerkey)

            except Entity.DoesNotExist:

                append(idx)

                continue

            try:

                e = Entity.objects.get(entity=entity)

                append(idx)

            except Entity.DoesNotExist:

                e = Entity.objects.create(entity=entity,

                                          owner=owner,

                                          key=key)

        if rejected:

            raise ReturnButFail(rejected)

        return rejected

    def set_entity_key(self, context={}, set_entity_key=()):

        rejected = []

        append = rejected.append

        for entity, key, newkey in set_entity_key:

            try:

                e = db_get_entity(entity=entity, key=key, for_update=True)

            except Entity.DoesNotExist:

                append(entity)

                continue

            e.key = newkey

            e.save()

        if rejected:

            raise ReturnButFail(rejected)

        return rejected

    def list_entities(self, context={}, entity=None, key=None):

        try:

            e = Entity.objects.get(entity=entity, key=key)

        except Entity.DoesNotExist:

            m = "Entity '%s' does not exist" % (entity,)

            raise NoEntityError(m)

        children = e.entities.all()

        entities = [e.entity for e in children]

        return entities

    def get_entity(self, context={}, get_entity=()):

        entities = []

        append = entities.append

        names = [entity for entity, key in get_entity]

        es = Entity.objects.select_related(depth=1).filter(entity__in=names)

        data = {}

        for e in es:

            data[e.entity] = e

        for entity, key in get_entity:

            e = data.get(entity, None)

            if e is None or e.key != key:

                continue

            append((entity, e.owner.entity))

        return entities

    def get_limits(self, context={}, get_limits=()):

        limits = []

        append = limits.append

        for policy in get_limits:

            try:

                p = Policy.objects.get(policy=policy)

            except Policy.DoesNotExist:

                continue

            append((policy, p.quantity, p.capacity,

                    p.import_limit, p.export_limit))

        return limits

    def set_limits(self, context={}, set_limits=()):

        for (policy, quantity, capacity,

             import_limit, export_limit) in set_limits:

            try:

                policy = db_get_policy(policy=policy, for_update=True)

            except Policy.DoesNotExist:

                Policy.objects.create(policy=policy,

                                      quantity=quantity,

                                      capacity=capacity,

                                      import_limit=import_limit,

                                      export_limit=export_limit)

            else:

                policy.quantity = quantity

                policy.capacity = capacity

                policy.export_limit = export_limit

                policy.import_limit = import_limit

                policy.save()

        return ()

    def get_holding(self, context={}, get_holding=()):

        holdings = []

        append = holdings.append

        for entity, resource, key in get_holding:

            try:

                h = Holding.objects.get(entity=entity, resource=resource)

            except Holding.DoesNotExist:

                continue

            if h.entity.key != key:

                continue

            append((h.entity.entity, h.resource, h.policy.policy,

                    h.imported, h.exported,

                    h.returned, h.released, h.flags))

        return holdings

    def _set_holding(self, entity, resource, policy, flags):

        try:

            h = db_get_holding(entity=entity, resource=resource,

                               for_update=True)

            h.policy = p

            h.flags = flags

            h.save()

        except Holding.DoesNotExist:

            h = Holding.objects.create(entity=e, resource=resource,

                                       policy=p, flags=flags)

        return h

    def set_holding(self, context={}, set_holding=()):

        rejected = []

        append = rejected.append

        for entity, resource, key, policy, flags in set_holding:

            try:

                e = Entity.objects.get(entity=entity, key=key)

            except Entity.DoesNotExist:

                append((entity, resource, policy))

                continue

            if e.key != key:

                append((entity, resource, policy))

                continue

            try:

                p = Policy.objects.get(policy=policy)

            except Policy.DoesNotExist:

                append((entity, resource, policy))

                continue

            try:

                h = db_get_holding(entity=entity, resource=resource,

                                   for_update=True)

                h.policy = p

                h.flags = flags

                h.save()

            except Holding.DoesNotExist:

                h = Holding.objects.create(entity=e, resource=resource,

                                           policy=p, flags=flags)

        if rejected:

            raise ReturnButFail(rejected)

        return rejected

    def _init_holding(self,

                      entity, resource, policy,

                      imported, exported, returned, released,

                      flags):

        try:

            h = db_get_holding(entity=entity, resource=resource,

                               for_update=True)

        except Holding.DoesNotExist:

            h = Holding(entity=entity, resource=resource)

        h.policy = policy

        h.flags = flags

        h.imported = imported

        h.importing = imported

        h.exported = exported

        h.exporting = exported

        h.returned = returned

        h.returning = returned

        h.released = released

        h.releasing = released

        h.save()

    def init_holding(self, context={}, init_holding=()):

        rejected = []

        append = rejected.append

        for idx, sfh in enumerate(init_holding):

            (entity, resource, key, policy,

             imported, exported, returned, released,

             flags) = sfh

            try:

                e = Entity.objects.get(entity=entity, key=key)

            except Entity.DoesNotExist:

                append(idx)

                continue

            if e.key != key:

                append(idx)

                continue

            try:

                p = Policy.objects.get(policy=policy)

            except Policy.DoesNotExist:

                append(idx)

                continue

            self._init_holding(e, resource, p,

                               imported, exported,

                               returned, released,

                               flags)

        if rejected:

            raise ReturnButFail(rejected)

        return rejected

    def reset_holding(self, context={}, reset_holding=()):

        rejected = []

        append = rejected.append

        for idx, tpl in enumerate(reset_holding):

            (entity, resource, key,

             imported, exported, returned, released) = tpl

            try:

                e = Entity.objects.get(entity=entity, key=key)

            except Entity.DoesNotExist:

                append(idx)

                continue

            try:

                h = db_get_holding(entity=entity, resource=resource,

                                   for_update=True)

                h.imported = imported

                h.importing = imported

                h.exported = exported

                h.exporting = exported

                h.returned = returned

                h.returning = returned

                h.released = released

                h.releasing = released

                h.save()

            except Holding.DoesNotExist:

                append(idx)

                continue

        if rejected:

            raise ReturnButFail(rejected)

        return rejected

    def _check_pending(self, entity, resource):

        cs = Commission.objects.filter(entity=entity)

        cs = [c for c in cs if c.provisions.filter(resource=resource)]

        as_target = [c.serial for c in cs]

        ps = Provision.objects.filter(entity=entity, resource=resource)

        as_source = [p.serial.serial for p in ps]

        return as_target + as_source

    def _actual_quantity(self, holding):

        hp = holding.policy

        return hp.quantity + (holding.imported + holding.returned -

                              holding.exported - holding.released)

    def _new_policy_name(self):

        return newname('policy_')

    def _increase_resource(self, entity, resource, amount):

        try:

            h = db_get_holding(entity=entity, resource=resource,

                               for_update=True)

        except Holding.DoesNotExist:

            h = Holding(entity=entity, resource=resource)

            p = Policy.objects.create(policy=self._new_policy_name(),

                                      quantity=0,

                                      capacity=QH_PRACTICALLY_INFINITE,

                                      import_limit=QH_PRACTICALLY_INFINITE,

                                      export_limit=QH_PRACTICALLY_INFINITE)

            h.policy = p

        h.imported += amount

        h.save()

    def release_holding(self, context={}, release_holding=()):

        rejected = []

        append = rejected.append

        for idx, (entity, resource, key) in enumerate(release_holding):

            try:

                h = db_get_holding(entity=entity, resource=resource,

                                   for_update=True)

            except Holding.DoesNotExist:

                append(idx)

                continue

            if h.entity.key != key:

                append(idx)

                continue

            if self._check_pending(entity, resource):

                append(idx)

                continue

            q = self._actual_quantity(h)

            if q > 0:

                owner = h.entity.owner

                self._increase_resource(owner, resource, q)

            h.delete()

        if rejected:

            raise ReturnButFail(rejected)

        return rejected

    def list_resources(self, context={}, entity=None, key=None):

        try:

            e = Entity.objects.get(entity=entity)

        except Entity.DoesNotExist:

            m = "No such entity '%s'" % (entity,)

            raise NoEntityError(m)

        if e.key != key:

            m = "Invalid key for entity '%s'" % (entity,)

            raise InvalidKeyError(m)

        holdings = e.holding_set.filter(entity=entity)

        resources = [h.resource for h in holdings]

        return resources

    def list_holdings(self, context={}, list_holdings=()):

        rejected = []

        reject = rejected.append

        holdings_list = []

        append = holdings_list.append

        for entity, key in list_holdings:

            try:

                e = Entity.objects.get(entity=entity)

                if e.key != key:

                    raise Entity.DoesNotExist("wrong key")

            except Entity.DoesNotExist:

                reject(entity)

                continue

            holdings = e.holding_set.filter(entity=entity)

            append([[entity, h.resource,

                     h.imported, h.exported, h.returned, h.released]

                    for h in holdings])

        return holdings_list, rejected

    def get_quota(self, context={}, get_quota=()):

        quotas = []

        append = quotas.append

        entities = set(e for e, r, k in get_quota)

        hs = Holding.objects.select_related().filter(entity__in=entities)

        holdings = {}

        for h in hs:

            holdings[(h.entity_id, h.resource)] = h

        for entity, resource, key in get_quota:

            try:

                h = holdings[(entity, resource)]

            except:

                continue

            if h.entity.key != key:

                continue

            p = h.policy

            append((h.entity.entity, h.resource, p.quantity, p.capacity,

                    p.import_limit, p.export_limit,

                    h.imported, h.exported,

                    h.returned, h.released,

                    h.flags))

        return quotas

    def set_quota(self, context={}, set_quota=()):

        rejected = []

        append = rejected.append

        q_holdings = Q()

        entities = []

        for (entity, resource, key, _, _, _, _, _) in set_quota:

            q_holdings |= Q(entity=entity, resource=resource)

            entities.append(entity)

        hs = Holding.objects.filter(q_holdings).select_for_update()

        holdings = {}

        for h in hs:

            holdings[(h.entity_id, h.resource)] = h

        entities = Entity.objects.in_bulk(entities)

        old_policies = []

        for (entity, resource, key,

             quantity, capacity,

             import_limit, export_limit, flags) in set_quota:

            e = entities.get(entity, None)

            if e is None or e.key != key:

                append((entity, resource))

                continue

            policy = newname('policy_')

            newp = Policy(policy=policy,

                          quantity=quantity,

                          capacity=capacity,

                          import_limit=import_limit,

                          export_limit=export_limit)

            try:

                h = holdings[(entity, resource)]

                old_policies.append(h.policy_id)

                h.policy = newp

                h.flags = flags

            except KeyError:

                h = Holding(entity=e, resource=resource,

                            policy=newp, flags=flags)

            # the order is intentionally reversed so that it

            # would break if we are not within a transaction.

            # Has helped before.

            h.save()

            newp.save()

            holdings[(entity, resource)] = h

        objs = Policy.objects.annotate(refs=Count('holding'))

        objs.filter(policy__in=old_policies, refs=0).delete()

        if rejected:

            raise ReturnButFail(rejected)

        return rejected

    def add_quota(self,

                  context={}, clientkey=None, serial=None,

                  sub_quota=(), add_quota=()):

        rejected = []

        append = rejected.append

        if serial is not None:

            if clientkey is None:

                all_pairs = [(q[0], q[1]) for q in sub_quota + add_quota]

                raise ReturnButFail(all_pairs)

            try:

                cs = CallSerial.objects.get(serial=serial, clientkey=clientkey)

                all_pairs = [(q[0], q[1]) for q in sub_quota + add_quota]

                raise ReturnButFail(all_pairs)

            except CallSerial.DoesNotExist:

                pass

        sources = sub_quota + add_quota

        q_holdings = Q()

        entities = []

        for (entity, resource, key, _, _, _, _) in sources:

            q_holdings |= Q(entity=entity, resource=resource)

            entities.append(entity)

        hs = Holding.objects.filter(q_holdings).select_for_update()

        holdings = {}

        for h in hs:

            holdings[(h.entity_id, h.resource)] = h

        entities = Entity.objects.in_bulk(entities)

        pids = [h.policy_id for h in hs]

        policies = Policy.objects.in_bulk(pids)

        old_policies = []

        for removing, source in [(True, sub_quota), (False, add_quota)]:

            for (entity, resource, key,

                 quantity, capacity,

                 import_limit, export_limit) in source:

                e = entities.get(entity, None)

                if e is None or e.key != key:

                    append((entity, resource))

                    continue

                try:

                    h = holdings[(entity, resource)]

                    old_policies.append(h.policy_id)

                    try:

                        p = policies[h.policy_id]

                    except KeyError:

                        raise AssertionError("no policy %s" % h.policy_id)

                except KeyError:

                    if removing:

                        append((entity, resource))

                        continue

                    h = Holding(entity=e, resource=resource, flags=0)

                    p = None

                policy = newname('policy_')

                newp = Policy(policy=policy)

                newp.quantity = _add(p.quantity if p else 0, quantity,

                                     invert=removing)

                newp.capacity = _add(p.capacity if p else 0, capacity,

                                     invert=removing)

                newp.import_limit = _add(p.import_limit if p else 0,

                                         import_limit, invert=removing)

                newp.export_limit = _add(p.export_limit if p else 0,

                                         export_limit, invert=removing)

                new_values = [newp.capacity,

                              newp.import_limit, newp.export_limit]

                if any(map(_isneg, new_values)):

                    append((entity, resource))

                    continue

                h.policy = newp

                # the order is intentionally reversed so that it

                # would break if we are not within a transaction.

                # Has helped before.

                h.save()

                newp.save()

                policies[policy] = newp

                holdings[(entity, resource)] = h

        objs = Policy.objects.annotate(refs=Count('holding'))

        objs.filter(policy__in=old_policies, refs=0).delete()

        if rejected:

            raise ReturnButFail(rejected)

        if serial is not None and clientkey is not None:

            CallSerial.objects.create(serial=serial, clientkey=clientkey)

        return rejected

    def ack_serials(self, context={}, clientkey=None, serials=()):

        if clientkey is None:

            return

        for serial in serials:

            try:

                c = db_get_callserial(clientkey=clientkey,

                                      serial=serial,

                                      for_update=True)

                c.delete()

            except CallSerial.DoesNotExist:

                pass

        return

    def query_serials(self, context={}, clientkey=None, serials=()):

        result = []

        append = result.append

        if clientkey is None:

            return result

        if not serials:

            cs = CallSerial.objects.filter(clientkey=clientkey)

            return [c.serial for c in cs]

        for serial in serials:

            try:

                db_get_callserial(clientkey=clientkey, serial=serial)

                append(serial)

            except CallSerial.DoesNotExist:

                pass

        return result

    def issue_commission(self,

                         context={},

                         clientkey=None,

                         target=None,

                         key=None,

                         name=None,

                         provisions=()):

        try:

            t = Entity.objects.get(entity=target)

        except Entity.DoesNotExist:

            m = "No target entity '%s'" % (target,)

            raise NoEntityError(m)

        else:

            if t.key != key:

                m = "Invalid key for target entity '%s'" % (target,)

                raise InvalidKeyError(m)

        create = Commission.objects.create

        commission = create(entity_id=target, clientkey=clientkey, name=name)

        serial = commission.serial

        checked = []

        for entity, resource, quantity in provisions:

            if entity == target:

                m = "Cannot issue commission from an entity to itself (%s)" % (

                    entity,)

                raise InvalidDataError(m)

            ent_res = entity, resource

            if ent_res in checked:

                m = "Duplicate provision for %s.%s" % ent_res

                raise DuplicateError(m)

            checked.append(ent_res)

            try:

                e = Entity.objects.get(entity=entity)

            except Entity.DoesNotExist:

                m = "No source entity '%s'" % (entity,)

                raise NoEntityError(m)

            release = 0

            if quantity < 0:

                release = 1

            # Source limits checks

            try:

                h = db_get_holding(entity=entity, resource=resource,

                                   for_update=True)

            except Holding.DoesNotExist:

                m = ("There is no quantity "

                     "to allocate from in %s.%s" % (entity, resource))

                raise NoQuantityError(m,

                                      source=entity, target=target,

                                      resource=resource, requested=quantity,

                                      current=0, limit=0)

            hp = h.policy

            if not release:

                current = h.exporting

                limit = hp.export_limit

                if current + quantity > limit:

                    m = ("Export limit reached for %s.%s" % (entity, resource))

                    raise ExportLimitError(m,

                                           source=entity,

                                           target=target,

                                           resource=resource,

                                           requested=quantity,

                                           current=current,

                                           limit=limit)

                limit = hp.quantity + h.imported - h.releasing

                unavailable = h.exporting - h.returned

                available = limit - unavailable

                if quantity > available:

                    m = ("There is not enough quantity "

                         "to allocate from in %s.%s" % (entity, resource))

                    raise NoQuantityError(m,

                                          source=entity,

                                          target=target,

                                          resource=resource,

                                          requested=quantity,

                                          current=unavailable,

                                          limit=limit)

            else:

                current = (+ h.importing + h.returning

                           - h.exported - h.returned)

                limit = hp.capacity

                if current - quantity > limit:

                    m = ("There is not enough capacity "

                         "to release to in %s.%s" % (entity, resource))

                    raise NoQuantityError(m,

                                          source=entity,

                                          target=target,

                                          resource=resource,

                                          requested=quantity,

                                          current=current,

                                          limit=limit)

            # Target limits checks

            try:

                th = db_get_holding(entity=target, resource=resource,

                                    for_update=True)

            except Holding.DoesNotExist:

                m = ("There is no capacity "

                     "to allocate into in %s.%s" % (target, resource))

                raise NoCapacityError(m,

                                      source=entity,

                                      target=target,

                                      resource=resource,

                                      requested=quantity,

                                      current=0,

                                      limit=0)

            tp = th.policy

            if not release:

                limit = tp.import_limit

                current = th.importing

                if current + quantity > limit:

                    m = ("Import limit reached for %s.%s" % (target, resource))

                    raise ImportLimitError(m,

                                           source=entity,

                                           target=target,

                                           resource=resource,

                                           requested=quantity,

                                           current=current,

                                           limit=limit)

                limit = tp.quantity + tp.capacity

                current = (+ th.importing + th.returning + tp.quantity

                           - th.exported - th.released)

                if current + quantity > limit:

                    m = ("There is not enough capacity "

                         "to allocate into in %s.%s" % (target, resource))

                    raise NoCapacityError(m,

                                          source=entity,

                                          target=target,

                                          resource=resource,

                                          requested=quantity,

                                          current=current,

                                          limit=limit)

            else:

                limit = tp.quantity + th.imported - th.releasing

                unavailable = th.exporting - th.returned

                available = limit - unavailable

                if available + quantity < 0:

                    m = ("There is not enough quantity "

                         "to release from in %s.%s" % (target, resource))

                    raise NoCapacityError(m,

                                          source=entity,

                                          target=target,

                                          resource=resource,

                                          requested=quantity,

                                          current=unavailable,

                                          limit=limit)

            Provision.objects.create(serial=commission,

                                     entity=e,

                                     resource=resource,

                                     quantity=quantity)

            if release:

                h.returning -= quantity

                th.releasing -= quantity

            else:

                h.exporting += quantity

                th.importing += quantity

            h.save()

            th.save()

        return serial

    def _log_provision(self,

                       commission, s_holding, t_holding,

                       provision, log_time, reason):

        s_entity = s_holding.entity

        s_policy = s_holding.policy

        t_entity = t_holding.entity

        t_policy = t_holding.policy

        kwargs = {

            'serial':              commission.serial,

            'name':                commission.name,

            'source':              s_entity.entity,

            'target':              t_entity.entity,

            'resource':            provision.resource,

            'source_quantity':     s_policy.quantity,

            'source_capacity':     s_policy.capacity,

            'source_import_limit': s_policy.import_limit,

            'source_export_limit': s_policy.export_limit,

            'source_imported':     s_holding.imported,

            'source_exported':     s_holding.exported,

            'source_returned':     s_holding.returned,

            'source_released':     s_holding.released,

            'target_quantity':     t_policy.quantity,

            'target_capacity':     t_policy.capacity,

            'target_import_limit': t_policy.import_limit,

            'target_export_limit': t_policy.export_limit,

            'target_imported':     t_holding.imported,

            'target_exported':     t_holding.exported,

            'target_returned':     t_holding.returned,

            'target_released':     t_holding.released,

            'delta_quantity':      provision.quantity,

            'issue_time':          commission.issue_time,

            'log_time':            log_time,

            'reason':              reason,

        }

        ProvisionLog.objects.create(**kwargs)

    def accept_commission(self,

                          context={}, clientkey=None,

                          serials=(), reason=''):

        log_time = now()

        for serial in serials:

            try:

                c = db_get_commission(clientkey=clientkey, serial=serial,

                                      for_update=True)

            except Commission.DoesNotExist:

                return

            t = c.entity

            provisions = db_filter_provision(serial=serial, for_update=True)

            for pv in provisions:

                try:

                    h = db_get_holding(entity=pv.entity.entity,

                                       resource=pv.resource, for_update=True)

                    th = db_get_holding(entity=t, resource=pv.resource,

                                        for_update=True)

                except Holding.DoesNotExist:

                    m = "Corrupted provision"

                    raise CorruptedError(m)

                quantity = pv.quantity

                release = 0

                if quantity < 0:

                    release = 1

                if release:

                    h.returned -= quantity

                    th.released -= quantity

                else:

                    h.exported += quantity

                    th.imported += quantity

                reason = 'ACCEPT:' + reason[-121:]

                self._log_provision(c, h, th, pv, log_time, reason)

                h.save()

                th.save()

                pv.delete()

            c.delete()

        return

    def reject_commission(self,

                          context={}, clientkey=None,

                          serials=(), reason=''):

        log_time = now()

        for serial in serials:

            try:

                c = db_get_commission(clientkey=clientkey, serial=serial,

                                      for_update=True)

            except Commission.DoesNotExist:

                return

            t = c.entity

            provisions = db_filter_provision(serial=serial, for_update=True)

            for pv in provisions:

                try:

                    h = db_get_holding(entity=pv.entity.entity,

                                       resource=pv.resource, for_update=True)

                    th = db_get_holding(entity=t, resource=pv.resource,

                                        for_update=True)

                except Holding.DoesNotExist:

                    m = "Corrupted provision"

                    raise CorruptedError(m)

                quantity = pv.quantity

                release = 0

                if quantity < 0:

                    release = 1

                if release:

                    h.returning += quantity

                    th.releasing += quantity

                else:

                    h.exporting -= quantity

                    th.importing -= quantity

                reason = 'REJECT:' + reason[-121:]

                self._log_provision(c, h, th, pv, log_time, reason)

                h.save()

                th.save()

                pv.delete()

            c.delete()

        return

    def get_pending_commissions(self, context={}, clientkey=None):

        pending = Commission.objects.filter(clientkey=clientkey)

        pending_list = pending.values_list('serial', flat=True)

        return pending_list

    def resolve_pending_commissions(self,

                                    context={}, clientkey=None,

                                    max_serial=None, accept_set=()):

        accept_set = set(accept_set)

        pending = self.get_pending_commissions(context=context,

                                               clientkey=clientkey)

        pending = sorted(pending)

        accept = self.accept_commission

        reject = self.reject_commission

        for serial in pending:

            if serial > max_serial:

                break

            if serial in accept_set:

                accept(context=context, clientkey=clientkey, serials=[serial])

            else:

                reject(context=context, clientkey=clientkey, serials=[serial])

        return

    def release_entity(self, context={}, release_entity=()):

        rejected = []

        append = rejected.append

        for entity, key in release_entity:

            try:

                e = db_get_entity(entity=entity, key=key, for_update=True)

            except Entity.DoesNotExist:

                append(entity)

                continue

            if e.entities.count() != 0:

                append(entity)

                continue

            if e.holding_set.count() != 0:

                append(entity)

                continue

            e.delete()

        if rejected:

            raise ReturnButFail(rejected)

        return rejected

    def get_timeline(self, context={}, after="", before="Z", get_timeline=()):

        entity_set = set()

        e_add = entity_set.add

        resource_set = set()

        r_add = resource_set.add

        for entity, resource, key in get_timeline:

            if entity not in entity_set:

                try:

                    e = Entity.objects.get(entity=entity, key=key)

                    e_add(entity)

                except Entity.DoesNotExist:

                    continue

            r_add((entity, resource))

        chunk_size = 65536

        nr = 0

        timeline = []

        append = timeline.append

        filterlogs = ProvisionLog.objects.filter

        if entity_set:

            q_entity = Q(source__in=entity_set) | Q(target__in=entity_set)

        else:

            q_entity = Q()

        while 1:

            logs = filterlogs(q_entity,

                              issue_time__gt=after,

                              issue_time__lte=before,

                              reason__startswith='ACCEPT:')

            logs = logs.order_by('issue_time')

            #logs = logs.values()

            logs = logs[:chunk_size]

            nr += len(logs)

            if not logs:

                break

            for g in logs:

                if ((g.source, g.resource) not in resource_set

                    or (g.target, g.resource) not in resource_set):

                    continue

                o = {

                    'serial':                   g.serial,

                    'source':                   g.source,

                    'target':                   g.target,

                    'resource':                 g.resource,

                    'name':                     g.name,

                    'quantity':                 g.delta_quantity,

                    'source_allocated':         g.source_allocated(),

                    'source_allocated_through': g.source_allocated_through(),

                    'source_inbound':           g.source_inbound(),

                    'source_inbound_through':   g.source_inbound_through(),

                    'source_outbound':          g.source_outbound(),

                    'source_outbound_through':  g.source_outbound_through(),

                    'target_allocated':         g.target_allocated(),

                    'target_allocated_through': g.target_allocated_through(),

                    'target_inbound':           g.target_inbound(),

                    'target_inbound_through':   g.target_inbound_through(),

                    'target_outbound':          g.target_outbound(),

                    'target_outbound_through':  g.target_outbound_through(),

                    'issue_time':               g.issue_time,

                    'log_time':                 g.log_time,

                    'reason':                   g.reason,

                }

                append(o)

            after = g.issue_time

            if after >= before:

                break

        return timeline

def _add(x, y, invert=False):

    return x + y if not invert else x - y

def _update(dest, source, attr, delta):

    dest_attr = getattr(dest, attr)

    dest_attr = _add(getattr(source, attr, 0), delta)

def _isneg(x):

    return x < 0

API_Callpoint = QuotaholderDjangoDBCallpoint